JP2024068463A - Pipe joint processing device, threading unit, and pipe joint processing method - Google Patents

Abstract

[Problem] To provide a pipe joint processing device capable of forming a reducer pipe joint to a standard inner diameter by processing a thick portion of the reducer pipe joint. [Solution] The pipe joint processing device processes the inner peripheral surface of the thick portion of the reducer pipe joint to form the other pipe end side of the reducer pipe joint to the inner diameter of the product standard. The pipe joint processing device includes a die for holding the reducer pipe joint, and a processing unit for processing the thick portion of the reducer pipe joint held in the die to form the other pipe side including the other pipe end of the reducer pipe joint to the standard inner diameter of the product standard. The processing unit has N (integer of 3 or more) processing portions and a holding shaft, and each processing tool γ is formed into a spherical trapezoid shape. The N processing tools are processed in order from the first processing tool while pressing the spherical band of the processing tool against the inner peripheral surface of the thick portion to form the other pipe end side including the other pipe end of the reducer pipe joint to the inner diameter of the product standard. [Selected Figure] Figure 1

Description

The present invention relates to a pipe joint processing device, a threading unit, and a pipe joint processing method that perform threading on the inner peripheral surface of the thick portion of a reducer pipe joint.

As a processing technique for reducer pipe fittings, Patent Document 1 discloses a manufacturing method for reducer pipe fittings. In Patent Document 1, a tube with an outer diameter smaller than the inlet diameter of a die is pressed downward by a pusher, and one end of the tube is squeezed and reduced in diameter to conform to the shape inside the die, forming a concentric reducer pipe fitting.

Japanese Patent Application Laid-Open No. 2-247032

In Patent Document 1, when one end of a tube is squeezed to reduce its diameter, the one end of the tube is formed into a thicker portion that is thicker than the other end, and the inner diameter of the thicker portion becomes smaller than the standard inner diameter of the product.

The present invention aims to provide a pipe fitting processing device, a threading unit, and a processing method for pipe fittings that can be formed to the standard inner diameter of the product standard by threading the inner circumferential surface of the thick-walled portion of a reducer pipe fitting.

The present invention provides a pipe joint processing device for a reducer pipe joint comprising a pipe section at one pipe end side of a metal pipe and a tapered pipe section whose diameter is gradually reduced from the pipe section toward the other pipe end of the metal pipe, the other pipe end side of the tapered pipe section having a thick-walled portion formed to be thicker than the pipe section side, the pipe joint processing device performing a striking process on an inner peripheral surface of the thick-walled portion, the pipe joint processing device comprising: a device main body having a table and a base arranged at a distance from the table; a die formed into a three-dimensional shape having a die surface and a die back surface arranged parallel to the die surface at a distance; N (an integer of 3 or more) striking tools and a striking unit having a holding shaft; and an actuator, the die being formed in the die with an opening on the die surface, and a shape tracing the outer peripheral surface of the pipe section and the outer peripheral surface of the tapered pipe section in that order from the die surface. a tube holding hole formed in a shape similar to that of the tapered tube portion, and a retraction hole having the same diameter as the outer diameter of the other tube end of the tapered tube portion and arranged concentrically with the tube holding hole, formed in the die between the tube holding hole and the rear surface of the die, and opening on the tube holding hole and the rear surface of the die, the die is arranged between the base and the table with the die surface facing the base and fixed to the table, the reducer tube fitting is inserted into the tube holding hole of the die from the other tube end and arranged in the tube holding hole from the die surface, and is held by the die with the outer peripheral surface of the tube portion and the outer peripheral surface of the tapered tube portion abutting against the tube holding hole, each of the handling tools has a handling section formed in a spherical trapezoid shape having a pair of planes, a spherical zone and a spherical center, and is arranged concentrically with the handling section, and is moved in a direction of a spherical center line passing through the spherical center of the handling section and perpendicular to each of the planes. and a through hole penetrating the scraping portion and opening on each of the planes, the scraping portion is arranged concentrically with the holding shaft, fitted onto the holding shaft, and fixed to the holding shaft adjacent to each other in the direction of the axial center line of the holding shaft, the holding shaft passes through the through hole of each of the scraping tools, and the scraping tools are arranged adjacent to each other in the direction of the axial center line of the holding shaft (the scraping tools are arranged consecutively in the direction of the axial center line) to hold N of the scraping portions between each axial end of the holding shaft, the scraping portion of the first scraping tool from one axial end of the holding shaft is formed in a spherical trapezoid shape having a spherical diameter that exceeds the inner diameter of the thick-walled portion of the tapered tube portion and is less than the standard inner diameter of the product standard of the other tube end, the scraping portion of the Nth scraping tool from one axial end of the holding shaft is formed in a spherical trapezoid shape having a spherical diameter that is the same as the standard inner diameter, the first position at which the first end of the holding shaft is spaced from the spherical zone of each of the first and second strikers and the second position at which the first and second strikers are disposed in the recesses of the first and second slots, the second position at which the first and second strikers are disposed in the recesses of the first and second slots, the third position at which the first and second strikers are disposed in the recesses of the first and second slots, the fourth position at which the first and second strikers are disposed in the recesses of the first and second slots, the fourth position at which the first and second strikers are disposed in the recesses of the second ...
The pipe fitting processing apparatus of the present invention comprises a threading unit having one threading tool and a holding shaft, and in the threading tool, the threading portion is formed into a spherical truncated shape having a spherical diameter that is the same as the standard inner diameter of the product standard of the other pipe end, and is formed into a spherical truncated shape having a spherical diameter that exceeds the spherical diameter of the threading portion and is less than the standard inner diameter.
The pipe fitting processing apparatus of the present invention comprises a striking unit having two striking tools and a holding shaft, and in the striking tool first from one axial end of the holding shaft, the striking portion is formed in a spherical truncated shape having a spherical diameter that exceeds the inner diameter of the thick-walled portion of the tapered pipe section and is less than the standard inner diameter of the product standard of the other pipe end, and in the striking tool second from one axial end of the holding shaft, the striking portion is formed in a spherical truncated shape having a spherical diameter the same as the standard inner diameter.

The present invention relates to a reducer pipe fitting comprising a pipe section at one pipe end side of a metal pipe, and a tapered pipe section whose diameter is gradually reduced from the pipe section toward the other pipe end of the metal pipe, and wherein the other pipe end side of the tapered pipe section has a thick-walled portion formed to be thicker than the wall thickness of the pipe section side. The striking unit is used to strike an inner circumferential surface of the thick-walled portion, and comprises N (an integer of 3 or more) striking tools and a holding shaft, and each striking tool has a striking part formed in a spherical trapezoid shape having a pair of planes, a spherical zone, and a spherical center, and a through hole that is arranged concentrically with the striking part, passes through the striking part in a direction of a spherical center line perpendicular to each of the planes, passes through the spherical center of the striking part, and opens into each of the planes, and is arranged concentrically with the holding shaft and fitted onto the holding shaft, and each striking tool has a striking part adjacent to the direction of the axial center line of the holding shaft, and the striking part is formed in a spherical trapezoid shape having a pair of planes, a spherical zone, and a spherical center, and the striking part is formed in a spherical trapezoid shape having a pair of planes, a spherical zone, and a spherical center, and The present invention is characterized in that the scraping portion is fixed to a holding shaft, the holding shaft passes through the through holes of each of the scrapers and arranges the each of the scrapers adjacent to each other in the direction of the axial center line of the holding shaft (arranges the each of the scrapers consecutively in the direction of the axial center line), and holds N of the scraping portions between each of the axial ends of the holding shaft, and in the first scraper from one axial end of the holding shaft, the scraping portion is formed in a spherical trapezoid shape having a spherical diameter that exceeds the inner diameter of the thick-walled portion of the tapered tube portion and is less than the standard inner diameter of the product standard of the other tube end, and in the Nth scraper from one axial end of the holding shaft, the scraping portion is formed in a spherical trapezoid shape having a spherical diameter that is the same as the standard inner diameter, and in each of the scrapers between the first and Nth scrapers, the scraping portion is formed in a spherical trapezoid shape having a spherical diameter that exceeds the spherical diameter of the adjacent scraper on the one axial end side and is less than the standard inner diameter.
The threading unit of the present invention comprises one threading tool and a holding shaft, each of the threading tools being arranged concentrically with the holding shaft, fitted onto the outside of the holding shaft, and fixed to the holding shaft, the holding shaft passing through the through hole of the threading tool and holding one of the threading portions between each axial end of the holding shaft, and the threading portion of the threading tool is formed in a spherical trapezoid shape having a spherical diameter that is the same as the standard inner diameter of the product standard of the other tube end.
The scraping unit of the present invention comprises two scraping tools and a holding shaft, and in the first scraping tool from one axial end of the holding shaft, the scraping portion is formed in a spherical trapezoid shape having a spherical diameter that exceeds the inner diameter of the thick-walled portion of the tapered tube section and is less than the standard inner diameter of the product standard of the other tube end, and in the second scraping tool from one axial end of the holding shaft, the scraping portion is formed in a spherical trapezoid shape having a spherical diameter that is the same as the standard inner diameter.

The method for processing a pipe fitting of the present invention includes a reducer pipe fitting comprising a pipe section at one pipe end side of a metal pipe, and a tapered pipe section whose diameter is gradually reduced from the pipe section toward the other pipe end of the metal pipe, the reducer pipe fitting having a thick portion at the other pipe end side of the tapered pipe section that is formed to be thicker than the wall thickness of the pipe section side, a die formed into a three-dimensional shape having a die surface and a die back surface arranged parallel to and spaced from the die surface, and a striking unit having N (an integer of 3 or more) striking tools and a retaining shaft, the die comprising: a tube holding hole that opens onto the die surface and is formed in the die, the tube holding hole being formed in a shape that follows the outer circumferential surface of the tube section and the outer circumferential surface of the tapered pipe section in that order from the die surface; each of the scraping tools has a scraping section formed in a spherical trapezoid shape having a pair of planes, a spherical zone and a spherical center, and a through hole that is arranged concentrically with the scraping section, passes through the scraping section in a direction of a spherical center line perpendicular to each of the planes, and opens to each of the planes; the scraping tools are arranged concentrically with the holding shaft, are fitted onto the holding shaft, and are fixed to the holding shaft adjacent to each other in the direction of the axial center line of the holding shaft, the holding shaft passes through the through hole of each of the scraping tools, and the scraping tools are arranged adjacent to each other in the direction of the axial center line of the holding shaft (the scraping tools are arranged consecutively in the direction of the axial center line) to hold N of the scraping sections between each axial end of the holding shaft, and in the first scraping tool from one axial end of the holding shaft, the scraping section exceeds an inner diameter of the thick-walled portion of the tapered tube section and extends forward from the front end of the holding shaft; a first axial end of the holder shaft facing a surface of the die and a second axial end of the holder shaft facing a surface of the die, the first axial end of the holder shaft facing a surface of the die and a third axial end of the holder shaft facing a surface of the die, the second axial end of the holder shaft facing a surface of the die and a fourth axial end of the holder shaft facing a surface of the die, the third axial end of the holder shaft facing a surface of the die and a fourth axial end of the holder shaft facing a surface of the die, the fourth axial end of the holder shaft facing a surface of the die and a fourth axial end of the holder shaft facing a surface of the die, the fourth axial end of the holder shaft facing a surface of the die and a fourth axial end of the holder shaft facing a surface of the die, the fourth axial end of the holder shaft facing a surface of the die and a fourth axial end of the holder shaft facing a surface of the die, the fourth axial end of the holder shaft facing a surface of the die and a fourth axial end of the holder shaft facing a surface of the die, the fourth axial end of the holder shaft facing a surface of the die and a fourth axial end of the holder shaft facing a surface of the die, the fourth axial end of the holder shaft facing a surface of the die and a fourth axial end of the holder shaft facing a surface of the die, the N pieces of scraping tools are moved from the first position toward the retraction hole, starting from the first scraping tool, through the pipe section and the tapered pipe section held in the die, and then through the tapered pipe section, in that order, to insert each of the scraping tools into the retraction hole; and in the scraping step, as the N pieces of scraping tools move toward the scraping unit, starting from the first scraping tool, the spherical bands of the N scraping parts are moved in sequence, starting from the first scraping part, toward the retraction hole while being pressed against the inner peripheral surface of the thick-walled portion, and the thick-walled portion is scraped and stretched by each of the scraping parts that have pressed the spherical band against the thick-walled portion, thereby thinning the other pipe end side including the other pipe end of the tapered pipe section to the standard inner diameter.
The present invention relates to a processing method for a pipe fitting, the method comprising: a striking unit having one striking tool and a retaining shaft; the striking portion of the striking tool is formed into a spherical trapezoid shape having the same spherical diameter as the standard inner diameter of the product standard of the other pipe end; and striking an inner peripheral surface of the thick-walled portion, the method comprising the steps of: inserting the reducer pipe fitting from the other pipe end into the pipe retaining hole of the die; bringing an outer peripheral surface of the pipe portion and an outer peripheral surface of the tapered pipe portion into contact with the pipe retaining hole to retain the reducer pipe fitting in the die; and, following the pipe retaining step, retracting the striking unit from the first position. and a striking process in which the one striking tool is moved toward the striking hole, penetrating the tube section and the tapered tube section held in the die and then the tapered tube section, in that order, to insert each striking tool into the retreat hole, wherein in the striking process, as the one striking tool moves toward the striking unit, the spherical band of the striking part is pressed against the inner surface of the thick-walled portion while being moved toward the retreat hole, and the thick-walled portion is struck and stretched by the striking part with the spherical band pressed against the thick-walled portion, thereby thinning the thick-walled portion and forming the other tube end side including the other tube end of the tapered tube section to the standard inner diameter.
The present invention relates to a processing method for a pipe fitting, which includes a striking unit having two striking tools and a retaining shaft, and in the striking tool which is the first from one axial end of the retaining shaft, the striking portion is formed into a spherical trapezoid shape having a spherical diameter which exceeds the inner diameter of the thick-walled portion of the tapered tube portion and is less than the standard inner diameter of the product standard of the other pipe end, and in the striking tool which is the second from one axial end of the retaining shaft, the striking portion is formed into a spherical trapezoid shape having the same spherical diameter as the standard inner diameter, and a striking process is performed on the inner peripheral surface of the thick-walled portion, the processing method for a pipe fitting includes a tube holding process of inserting the reducer pipe fitting from the other pipe end into the tube holding hole of the die, and abutting the outer peripheral surface of the pipe portion and the outer peripheral surface of the tapered tube portion against the tube holding hole to hold the reducer pipe fitting in the die, and a tube holding process of holding the reducer pipe fitting in the die. and a striking process following the holding process, in which the striking unit is moved from the first position toward the retraction hole, and the two striking tools are inserted into the retraction hole, starting from the first striking tool, by penetrating the tube portion and the tapered tube portion held in the mold and then the tapered tube portion, in that order, and in the striking process, as the two striking tools move toward the striking unit, the spherical bands of the two striking parts are moved toward the retraction hole, in the order of the first striking part and the second striking part, while being pressed against the inner peripheral surface of the thick-walled portion, and the thick-walled portion is stretched and thinned by the striking parts that have pressed the spherical band against the thick-walled portion, thereby forming the other tube end side including the other tube end of the tapered tube portion to the standard inner diameter.

In the present invention, by penetrating a reducer pipe fitting (within the thick portion) held in a mold with two or N (N is an integer of 3 or more) threading tools in sequence starting from the first threading tool, or by penetrating a reducer pipe fitting (within the thick portion) held in a mold with one or more threading tools, the thick portion can be handled by one or more threading portions, and the inner diameter of the other pipe end side, including the other pipe end, of the reducer pipe fitting can be formed to the standard inner diameter.
In the present invention, by using two or N (N is an integer of 3 or more) scrapers in sequence, starting from the first scraper, to scrape the thick portion of the reducer pipe fitting held in the die, the inner diameter of the thick portion can be gradually expanded and the inner diameter of the other pipe end side, including the other pipe end, can be formed to the standard inner diameter.This makes it possible to form the inner diameter of the other pipe end side, including the other pipe end, of the reducer pipe fitting held in the die to the standard inner diameter without damaging the other pipe end side of the tapered pipe portion.

1 is a front view showing a pipe joint processing device of a first embodiment (a front view showing a threading unit disposed at a first position). FIG. 1 is a side view showing a pipe joint processing device according to a first embodiment. FIG. FIG. 2 is an enlarged view of part A in FIG. FIG. 1 is a front view showing the pipe joint processing device of the first embodiment (a front view showing the threading unit disposed in a second position); FIG. 5 is an enlarged view of part B in FIG. 4 . FIG. 2A is a front view of a reducer pipe joint formed by drawing a metal pipe, and FIG. 2B is a cross-sectional view of the reducer pipe joint formed by drawing a metal pipe. 4A is a perspective view showing the threshing tool, and FIG. 4B is a front view showing the threshing tool. 1A is a bottom view (lower surface view) showing the threshing tool, and FIG. 1B is a plan view (upper surface view) showing the threshing tool. FIG. 8(b) is an enlarged view of the CC cross section of FIG. FIG. 2 is a front view showing a threshing unit having N threshing tools and a holding shaft. FIG. 2 is a bottom view (underside view) showing a threshing unit showing N threshing tools and a holder. This is a cross-sectional view taken along the line D-D of FIG. FIG. 13 is an enlarged view of part E in FIG. 12 . FIG. 2 is a partial cross-sectional view showing a threshing unit having three threshing tools and a holding shaft. FIG. 15 is a partially enlarged view of FIG. 14 . FIG. 1 is a front view of the pipe fitting processing apparatus of the first embodiment, in which the striking unit is moved from the first position to the second position and the spherical band (spherical surface) of the first striking portion (striking tool) of the striking unit is pressed against the inner circumferential surface of the thick portion of the reducer pipe fitting held in the mold. FIG. 11 is a front view of the pipe fitting processing apparatus of the first embodiment, in which the striking unit is moved from the first position to the second position and the first striking tool of the striking unit is passed through the reducer pipe fitting held in the die and inserted (retracted) into the retraction hole. 16A is an enlarged view of a portion F in FIG. 16, and FIG. 17B is an enlarged view of a portion G in FIG. FIG. 1 is a front view of the pipe fitting processing apparatus of the first embodiment, in which the striking unit is moved from the first position to the second position and the spherical band (spherical surface) of the second striking portion (striking tool) is pressed against the inner surface of the thick-walled portion of the reducer pipe fitting held in a pipe mold. FIG. 11 is a front view of the pipe fitting processing apparatus of the first embodiment, in which the stripping unit is moved from the first position to the second position and the second stripping tool is passed through the reducer pipe fitting held in the die and inserted (retracted) into the retraction hole. 20A is an enlarged view of a portion H in FIG. 19, and FIG. 20B is an enlarged view of a portion I in FIG. FIG. 11 is a front view of the pipe fitting processing apparatus of the first embodiment, in which the striking unit is moved from the first position to the second position and the spherical band (spherical surface) of the third (Nth) striking portion (striking tool) is pressed against the inner circumferential surface of the thick-walled portion of the reducer pipe fitting held in the mold. FIG. 11 is a front view of the pipe fitting processing apparatus of the first embodiment, in which the stripping unit is moved from the first position to the second position and the third (Nth) stripping tool is passed through the reducer pipe fitting held in the die and inserted (retreated) into the retraction hole. 22. FIG. 23(a) is an enlarged view of a portion J in FIG. 22, and FIG. 23(b) is an enlarged view of a portion K in FIG. 10 is a front view of the pipe joint processing apparatus of the first embodiment, in which the striking unit is moved from the second position to the first position and one pipe end of the reducer pipe joint is abutted against the stopper members of each stopper tool. FIG. FIG. 26 is an enlarged view of part L in FIG. 25 . 1 is a front view of the pipe joint processing apparatus of the first embodiment, in which a reducer pipe joint tube is extracted from a die (pipe holding hole) by a push-out tool (pushing shaft and pushing disk). FIG. FIG. 11 is a front view showing a pipe joint processing device according to a second embodiment (a front view showing a threading unit disposed in a first position). FIG. 29 is an enlarged view of part M in FIG. 28 . FIG. 13 is a front view showing a pipe joint processing device according to a second embodiment (a front view showing a cutting unit disposed in a second position); FIG. 31 is an enlarged view of part N in FIG. 30 . FIG. 2 is a cross-sectional view showing a threshing unit having one threshing tool and a holding shaft. FIG. 33 is a partially enlarged view of FIG. 32. FIG. 13 is a front view of a pipe fitting processing apparatus according to a second embodiment, in which a striking unit is moved from a first position to a second position to press a spherical band (spherical surface) of a striking portion (stripping tool) of the striking unit against the inner peripheral surface of a thick portion of a reducer pipe fitting held in a die. This is a front view of the second embodiment of the pipe fitting processing device, in which the stripping unit is moved from the first position to the second position and the stripping tool of the stripping unit is passed through the reducer pipe fitting held in the die and inserted (retracted) into the retraction hole. 34A is an enlarged view of a portion O in FIG. 34, and FIG. 35B is an enlarged view of a portion P in FIG. FIG. 13 is a front view showing a pipe joint processing device according to a third embodiment (a front view showing a threading unit disposed at a first position). FIG. 38 is an enlarged view of the R portion of FIG. 37 . FIG. 13 is a front view showing a pipe joint processing device according to a third embodiment (a front view showing a cutting unit disposed at a second position); FIG. 40 is an enlarged view of portion S in FIG. 39 . FIG. 2 is a cross-sectional view showing a threshing unit having one threshing tool and a holding shaft. FIG. 47 is a partially enlarged view of FIG. 46. FIG. 13 is a front view of a pipe fitting processing apparatus according to a third embodiment, in which a striking unit is moved from a first position to a second position, and a spherical band (spherical surface) of a first striking portion (striking tool) of the striking unit is pressed against the inner peripheral surface of a thick portion of a reducer pipe fitting held in a die. FIG. 13 is a front view of a pipe fitting processing apparatus according to a third embodiment, in which the punching unit is moved from a first position to a second position and each punching tool of the punching unit is passed through a reducer pipe fitting held in a die and inserted (retracted) into the retraction hole. 43A is an enlarged view of a portion T in FIG. 43, and FIG. 44B is an enlarged view of a portion P in FIG. FIG. 13 is a front view of a pipe fitting processing apparatus according to a third embodiment, in which the striking unit is moved from the first position to the second position to press the spherical band (spherical surface) of the second striking portion (striking tool) against the inner circumferential surface of the thick-walled portion of the reducer pipe fitting held in a pipe mold. FIG. 13 is a front view of the pipe fitting processing apparatus of the third embodiment, in which the stripping unit is moved from the first position to the second position and the second stripping tool is passed through the reducer pipe fitting held in the die and inserted (retracted) into the retraction hole. 46, and FIG. 47 is an enlarged view of a portion W in FIG. FIG. 2 is a flow chart showing each step in the processing method of the pipe joint according to the first to third embodiments. FIG. 11 is a front view showing a reducer pipe fitting held by a die in a striking unit, die, and pipe holding step in the method for machining a pipe fitting of the first embodiment. FIG. 11 is a front view showing the first embodiment of the punching process of the pipe fitting processing method, in which the punching unit is moved from the first position toward the retreat hole and the spherical band (spherical surface) of the first punching portion (punching tool) is pressed against the inner surface of the thick-walled portion of the reducer pipe fitting held in the mold. FIG. 11 is a front view showing, in the processing method for a pipe fitting of the first embodiment, the striking unit being moved from the first position toward the retreat hole, and the first striking tool being passed through the reducer pipe fitting held in the die and inserted (retreated) into the retreat hole. 52A is an enlarged view of a portion a in FIG. 51, and FIG. 52B is an enlarged view of a portion b in FIG. FIG. 11 is a front view showing the first embodiment of the punching process of the pipe fitting processing method, in which the punching unit is moved from the first position toward the retreat hole and the spherical band (spherical surface) of the second punching portion (punching tool) abuts against the inner surface of the thick-walled portion of the reducer pipe fitting held in the mold. FIG. 11 is a front view showing the process of the pipe fitting machining method of the first embodiment in which the striking unit is moved from the first position toward the retreat hole, and the second striking tool is passed through the reducer pipe fitting held in the die and inserted (retreated) into the retreat hole. 54A is an enlarged view of part c in FIG. 54, and FIG. 55B is an enlarged view of part d in FIG. FIG. 11 is a front view showing the first embodiment of the striking unit being moved from the first position toward the retreat hole to press the spherical band (spherical surface) of the third (Nth) striking portion (striking tool) against the inner surface of the thick-walled portion of the reducer pipe fitting held in the mold in the striking process of the pipe fitting processing method. FIG. 11 is a front view showing the process of the first embodiment of the processing method for a pipe fitting in which the striking unit is moved from the first position toward the retreat hole, and the third (Nth) striking tool is passed through the reducer pipe fitting held in the die and inserted (retreated) into the retreat hole. 57(a) is an enlarged view of part e in FIG. 57, and FIG. 58(b) is an enlarged view of part f in FIG. FIG. 4 is a front view showing a tube removal step in the processing method for the pipe joint of the first embodiment. 1A is a front view showing a reducer pipe fitting after cutting in a cutting step of a processing method for pipe fittings according to the first to third embodiments, and FIG. 1B is a cross-sectional view showing the reducer pipe fitting after cutting. FIG. 11 is a front view showing the state in which the reducer joint of the product is connected to each metal pipe by welding. FIG. 11 is a front view showing a reducer pipe fitting held by a die in a striking unit, die, and pipe holding step in a processing method for a pipe fitting of a second embodiment. FIG. 13 is a front view showing the process of the second embodiment of the pipe fitting machining method in which the striking unit is moved from the first position toward the retreat hole to press the spherical band (spherical surface) of the striking portion (striking tool) against the inner surface of the thick-walled portion of the reducer pipe fitting held in the mold. FIG. 11 is a front view showing, in the processing method for a pipe fitting of the second embodiment, the scraping unit being moved from the first position toward the retraction hole, the scraping tool being passed through the reducer pipe fitting held in the die, and being inserted (retracted) into the retraction hole. 64A is an enlarged view of part g in FIG. 64, and FIG. 65B is an enlarged view of part h in FIG. FIG. 13 is a front view showing a reducer pipe fitting held by a die in a striking unit, die, and pipe holding step in a processing method for a pipe fitting of the third embodiment. FIG. 13 is a front view showing the process of the third embodiment of the pipe fitting machining method in which the striking unit is moved from the first position toward the retreat hole, and the spherical band (spherical surface) of the first striking portion (striking tool) is pressed against the inner surface of the thick-walled portion of the reducer pipe fitting held in the mold. FIG. 13 is a front view showing, in the processing method for a pipe fitting of the third embodiment, the striking unit being moved from the first position toward the retreat hole, and the first striking tool being passed through the reducer pipe fitting held in the die and inserted (retreated) into the retreat hole. 68(a) is an enlarged view of part i in FIG. 68, and FIG. 69(b) is an enlarged view of part j in FIG. 69. FIG. 13 is a front view showing the process of the third embodiment of the pipe fitting machining method in which the striking unit is moved from the first position toward the retreat hole so that the spherical band (spherical surface) of the second striking portion (striking tool) abuts against the inner surface of the thick-walled portion of the reducer pipe fitting held in the mold. FIG. 13 is a front view showing the process of the third embodiment of the pipe fitting machining method, in which the striking unit is moved from the first position toward the retreat hole, and the second striking tool is passed through the reducer pipe fitting held in the die and inserted (retreated) into the retreat hole. 72A is an enlarged view of a portion k in FIG. 71, and FIG. 72B is an enlarged view of a portion l in FIG.

The pipe joint processing device (reducer pipe joint processing device), the threading unit, and the pipe joint processing method (reducer pipe joint processing method) according to the present invention will be described with reference to Figures 1 to 73.

The first to third embodiments of the pipe joint processing device will be described with reference to Figures 1 to 73.

The pipe joint processing device and the stripping unit of the first embodiment (the stripping unit of the first embodiment) will be described with reference to Figures 1 to 27.

In Figures 16 to 24, the pipe fitting processing device X1 of the first embodiment processes (strives) the reducer pipe fitting Y.

As shown in Figure 6, the reducer fitting Y is a concentric reducer fitting tube and is formed of a cylindrical metal pipe P (steel pipe). The metal pipe P has a pipe outer diameter DP (outer diameter) and a pipe inner diameter dp (inner diameter). The reducer fitting Y has a pipe section YA on one pipe end Ya side of the metal pipe (steel pipe) and a tapered pipe section YB that is gradually tapered in diameter from the pipe section YA to the other pipe end Yb of the metal pipe P in the direction A of the pipe center line a of the metal pipe P (reducer fitting Y). The reducer pipe fitting Y is, for example, an unfinished reducer pipe fitting (unfinished reducer pipe fitting) before it becomes a product, and has a pipe section YA on one pipe end Ya of the metal pipe (steel pipe) and a tapered pipe section YB that is gradually (gradually) tapered in diameter from the pipe section YA toward the other pipe end Yb of the metal pipe P in the direction A of the pipe center line a of the metal pipe P (reducer pipe fitting Y) (reducer pipe fitting before production/reducer pipe fitting before completion).

As shown in FIG. 6, the reducer fitting Y has a thick portion YC on one pipe end Yb side of the tapered pipe section YB that is formed thicker than the pipe section YA side of the tapered pipe section YB. The thick portion YC is formed on one pipe end Yb side (the other pipe end Yb) of the reducer fitting Y (tapered pipe section YB) to protrude radially inward of the metal pipe P and to be thicker than the pipe section YA side.

The reducer pipe joint is formed, for example, by pressing the other pipe end Yb of a metal pipe P (steel pipe) into a drawing die and applying drawing to the other pipe end Yb side.
As shown in Fig. 6, the other pipe end Yb side of the metal pipe P (the other pipe end Yb side of the reducer pipe joint Y) is elongated in the direction A of the pipe center line a of the metal pipe P (reducer pipe joint Y) by drawing and protruded radially inward of the metal pipe P to have a thick-walled portion YC formed on the other pipe end Yb side of the tapered pipe section YB that is thicker than the thickness of the tapered pipe section YB on the pipe section YA side. The pipe section YA has a pipe outer diameter DP (outer diameter) and a pipe inner diameter dp (inner diameter). The other pipe end Yb of the tapered pipe section YB (thick-walled portion YC) has a pipe outer diameter Db (outer diameter) smaller than the pipe outer diameter DP of the pipe section YA. The thick-walled portion YC (the other pipe end Yb side of the tapered pipe section YB) has a pipe inner diameter dc (inner diameter) smaller than the standard inner diameter df.
As shown in FIG. 6, the reducer pipe fitting Y has a pipe section YB (pipe end section) on one pipe end Ya side of a metal pipe P (steel pipe), and a tapered pipe section YB on the other pipe end Yb side of the metal pipe P which is gradually (gradually) reduced in diameter from the pipe section YB toward the other pipe end Yb by drawing.

In Figures 1 to 15, the pipe joint processing device X1 of the first embodiment (hereinafter referred to as "pipe joint processing device X1") includes a device main body 1, a die 2 (pipe holder), a striking unit 3 (striking device), and an actuator 4.

As shown in Figures 1 and 2, the device body 1 includes a table 6 (bolster), a base 7 (crown/upper frame), multiple (four) tie rods 8 (guide shafts), a slide frame 12 (slider), a mold fixing device 13 (fixing device), a pair of stoppers 14 and 15, and an ejection device 16.

1 and 2, the table 6 is formed, for example, in a rectangular parallelepiped (three-dimensional shape) and has a circular extrusion hole 17. The table 6 has a table top plane 6A (table front surface) and a table bottom plane 6B (table bottom surface) in a height direction H (table height direction). The table 6 is fixed to an installation surface FL (floor surface) of a factory or the like by abutting the table bottom plane 6B against the installation surface FL (floor surface).
The extrusion hole 17 is formed in the table 6 at a position at the length center (length center) of the table 6 in the length direction L (length direction of the table) and at the width center (width center) of the table 6 in the width direction T (width direction of the table 6). The extrusion hole 17 is formed in a circular shape (circular hole), extends in the height direction H (height direction of the table 6), and opens into the table surface 6A.

As shown in Figs. 1 and 2, the base 7 is formed, for example, in a rectangular parallelepiped (three-dimensional shape). The base 7 has a base surface 7A and a base back surface 7B in the height direction H (height direction of the base 7). The base 7 is arranged with the base surface 7A facing the table surface plane 6A of the table 6. The base 7 is arranged on the table 6 (between the base surface 7A and the table surface plane 6A) at a distance H1 (height distance) in the height direction H (height direction of the table 6 and the base 7), and is fixed to the device main body 1.

1 and 2, each tie rod 8 is disposed between the table 6 (table surface plane 6A) and the base 7 (base surface 7A) with the rod center line b (shaft center line) facing the height direction H. Each tie rod 8 extends between the table 6 and the base 7 in the height direction H and is fixed to the table 6 and the base 7. The tie rods 8 (four tie rods) are arranged side by side at intervals in the length direction L of the table 6 (base 7) and at intervals in the width direction T of the table 6 (base 7).
The base 7 is fixed to each tie rod 8 (to the table 6 via each tie rod 8) and is disposed at a distance H1 from the table 6 in the height direction H.

As shown in Figs. 1, 2 and 4, the slide frame 12 is formed, for example, in a rectangular parallelepiped (three-dimensional shape). The slide frame 12 has a slide front surface 12A and a slide back surface 12B in the height direction H (height direction of the slide frame 12). The slide frame 12 is disposed between the table 6 (table front surface 6A) and the base 7 (base surface 7A) with the slide front surface 12A facing the table 6 (table front surface 6A). The slide frame 12 penetrates each tie rod 8 and is supported by each tie rod 8. Each tie rod 8 penetrates the slide frame 12 in the height direction H and supports the slide frame 12 so that it can slide freely. The slide frame 12 moves (lowers or rises) between the table 6 and the base 7 while sliding on each tie rod 8.

The mold fixture 13 (fixture) is disposed inside each tie rod 8 (between each tie rod 8) as shown in Figures 1 to 3. The mold fixture 13 has a base plate 18, a fixed plate 19, and a fixed cylinder member 20.

1 to 3, the base plate 18 is formed, for example, in a rectangular shape (rectangular plate) and has a base plate front surface 18A and a base plate back surface 18B in the plate thickness direction. The base plate 18 has a storage hole 21. The storage hole 21 is disposed at the plate center of the base plate. The storage hole 21 is formed in a circular shape (circular hole), penetrates the base plate 18 in the plate thickness direction, and opens to the base plate front surface 18A and the base plate back surface 18B.
The base plate 18 is placed on the table 6 with the base plate back surface 18B abutting against the table top plane 6A of the table 6. The base plate 18 is fixed to the table 6 with the storage hole 21 disposed concentrically with the extrusion hole 17.

1 to 3, the fixed plate 19 is formed, for example, in a rectangular shape (rectangular plate) and has a fixed plate front surface 19A and a fixed plate back surface 19B in the plate thickness direction. The fixed plate 19 has a communication hole 22. The communication hole 22 is disposed at the plate center of the fixed plate 19. The communication hole 22 is formed in a circular shape (circular hole), penetrates the fixed plate 19 in the plate thickness direction, and opens to the fixed plate front surface 19A and the fixed plate back surface 19B.
The fixed plate 19 is placed on the base plate 18 with the fixed plate back surface 19B in contact with the base plate front surface 18A of the base plate 18. The fixed plate 19 is fixed to the base plate 18 with the communication hole 22 arranged concentrically with the storage hole 21 (extrusion hole 17).

1 to 3, the fixed cylinder member 20 is formed in a cylindrical shape. The fixed cylinder member 20 is disposed concentrically with the communication hole 22 (the storage hole 21 and the extrusion hole 17). The fixed cylinder member 20 is removably fixed to the fixed plate 19 with one cylinder end 20A abutting against the fixed plate surface 19A.
The fixed cylinder member 20 has a cylinder length H2 from the fixed plate 19 (fixed plate surface 19A) in the height direction H, and is disposed between the fixed plate 19 (table 6) and the slide frame 12.

As shown in Figures 1 and 2, each of the stoppers 14, 15 is disposed inside each of the tie rods 8 (between each of the tie rods 8). As shown in Figures 1 to 3, each of the stoppers 14, 15 is disposed at the other tube end 20B (mold fixing device 13) of the fixed tube member 20. Each of the stoppers 14, 15 is disposed in the circumferential direction of the fixed tube member 20 with an angle (angle: 180 degrees) between each of the stoppers 14, 15.

As shown in FIGS. 1 to 3 , each of the retaining devices 14 and 15 has a guide member 23 and a retaining member 24 .
The guide member 23 is abutted against the other cylinder end 20B of the fixed cylinder member 20 and is fixed to the fixed cylinder member 20. The guide member 23 has a guide hole 25. The guide hole 25 is formed to penetrate the guide member 23 in the radial direction of the fixed cylinder member 20.
The retaining member 24 (slide member) is disposed on the guide member 23. The retaining member 24 is inserted into the guide hole 25 so as to be slidable (slidable/movable) in the guide hole 25.
3, the stopper member 24 of each of the stoppers 14, 15 is moved relative to the guide member 23 and protrudes into the fixed cylinder member 20 (inside the fixed cylinder member 20). The stopper member 24 of each of the stoppers 14, 15 slides in the guide hole 25 in the radial direction of the fixed cylinder member 20 and protrudes from inside the guide member 23 (guide hole 25) into the fixed cylinder member 20 (inside the fixed cylinder member 20), or retreats from inside the fixed cylinder member 20 (inside the fixed cylinder member 20) to inside the guide hole 25 (inside the guide member 23).

1 to 3, the pusher 16 is disposed across the table 6 and the mold fixture 13 (base plate 18). The pusher 16 has a pusher shaft 26 (shaft), a pusher disk 27 (disk), and a sub-hydraulic cylinder (not shown).
The extrusion shaft 26 is arranged concentrically with the fixed cylinder member 20 (extrusion hole 17) with the shaft center line c facing the height direction H. The extrusion shaft 26 is inserted from one shaft end into the fixed cylinder member 20, the communication hole 22, the storage hole 21, and the extrusion hole 17 in this order, and is arranged across the storage hole 21 and the extrusion hole 17. The extrusion disk 27 is formed in a circular shape (circular plate) and has a plate front surface and a plate back surface in the plate thickness direction. The extrusion disk 27 is inserted into the communication hole 22 concentrically with the extrusion shaft 26 (communication hole 22). The extrusion disk 27 is fixed to the extrusion shaft 26 with the plate back surface abutting against the other shaft end of the extrusion shaft 26. The extrusion disk 27 is arranged in the communication hole 22 with a gap between it and the hole inner peripheral surface of the communication hole 22. The sub hydraulic cylinder (auxiliary hydraulic cylinder) is arranged in the table 6 and connected to one shaft end of the extrusion shaft 26.
The push-out tool 16 moves the push-out shaft 26 and the push-out disk 27 in the height direction H by advancing (extending) the cylinder rod of the sub-hydraulic cylinder from within the cylinder body (not shown) or retracting the cylinder rod into the cylinder body. The push-out shaft 26 and the push-out disk 27 are moved (raised or lowered) in the height direction H (height direction of the table 6) by the sub-hydraulic cylinder (not shown). As the push-out disk 27 moves in the height direction H (height direction of the table 6), it is advanced from the communication hole 22 into the fixed cylinder member 20 or retracted from the fixed cylinder member 20 to the communication hole 22 (see FIGS. 1 and 27).

As shown in Figs. 1 to 3, the mold 2 is formed into a three-dimensional shape having a mold surface 2A and a mold back surface 2B arranged parallel to and spaced from the mold surface 2A.
The mold 2 is formed, for example, in a cylindrical (cylindrical) three-dimensional shape, and has a column length H2 (cylinder length/spacing) between one cylinder end face 2A (mold surface) and the other cylinder end face 2B (mold back face) in the direction of the cylinder center line s. The cylinder end faces 2A, 2B (hereinafter referred to as "mold surface 2A and mold back face 2B") are arranged in parallel with the cylinder center line s (mold center line) with the same column length H2 (spacing) as the cylinder length H2 of the fixed cylinder member 20.

As shown in Figures 1 to 3, the mold 2 (tube holder) has a tube holding hole 31 and a retreat hole 32.

As shown in Figures 1 to 3, the tube holding hole 31 is arranged concentrically with the die 2 (cylinder center line s). The tube holding hole 31 is formed in the die 2, opening on the die surface 2A. The tube holding hole 31 opens on the die surface 2A with a diameter that is approximately the same (the same or slightly larger) as the tube outer diameter DP of the metal tube P (tube section YA). The tube holding hole 31 is formed in a shape that imitates the outer peripheral surface α of the tube section YA and the outer peripheral surface β of the tapered tube section YB in the direction of the cylinder center line s from the die surface 2A. The tube holding hole 31 is formed in a shape that imitates the outer peripheral surface α of the tube section YA and the outer peripheral surface β of the tapered tube section YB in the direction of the cylinder center line s from the die surface 2A in the order of.

As shown in FIG. 3, the tube holding hole 31 has a first hole portion 33 and a second hole portion 34. The first hole portion 33 has a diameter (the same or slightly larger diameter) that is approximately the same as the tube outer diameter DP of the metal tube P (tube portion YA) and opens to the mold surface 2A. The first hole portion 33 is formed in a shape that imitates the outer peripheral surface α of the tube portion YA from the mold surface 2A to the mold back surface 2B in the direction of the cylinder center line s, with the tube length of the tube portion PA. The second hole portion 34 is formed in continuity with the first hole portion 33 in the direction of the cylinder center line s, as shown in FIG. 3, and is disposed between the first hole portion 33 and the mold back surface 2B. The second hole portion 34 is gradually reduced in diameter from the first hole portion 33 to the mold back surface 2B in the direction of the cylinder center line s, and is formed in a shape that imitates the outer peripheral surface β of the tapered tube portion YB.

The evacuation hole 32 is formed in the mold 2 as shown in Figures 1 to 3. The evacuation hole 32 has the same diameter as the pipe outer diameter Db (outer diameter) of the other pipe end Yb (thick wall portion YC) of the tapered pipe portion YB and is arranged concentrically with the pipe holding hole 31 (cylinder center line s). The evacuation hole 32 is formed between the pipe holding hole 31 (second hole portion 34) and the mold back surface 2B in the direction of the cylinder center line s. The evacuation hole 32 extends between the pipe holding hole 31 (second hole portion 34) and the mold back surface 2B in the direction of the cylinder center line s (mold center line), and opens (communicates) to the pipe holding hole 31 (second hole portion 34) and the mold back surface 2B.

As shown in Figures 1 to 3, the mold 2 is arranged with the cylindrical center line s (center line) facing the height direction H. The mold 2 is arranged between the base 7 (base surface 7A) and the table 6 (table surface plane 6A) with the mold surface 2A facing the base 7 (base surface 7A). The mold 2 is arranged between the slide frame 12 (slide surface 12A) and the table 6 (fixed plate 19) with the mold surface 2A (one cylindrical end face/one cylindrical end face) facing the slide frame (slide surface 12A).

As shown in Figs. 1 to 3, the mold 2 is arranged concentrically with the fixed cylinder member 20 (connecting hole 22). The mold 2 is inserted into the fixed cylinder member 20 from the mold back surface 2B and arranged between the fixed plate 19 and each of the retaining members 14, 15 (removal prevention members 24). The mold 2 is inserted into the fixed cylinder member 20 from the other cylinder end 20B. The mold 2 is arranged in the fixed cylinder member 20 with the mold outer peripheral surface abutting against the inner peripheral surface of the fixed cylinder member 20. The mold 2 is placed on the fixed plate 19 with the mold back surface 2B abutting against the fixed plate surface 19A of the fixed plate 19 and the mold surface 2A abutting against the guide members 23 of the retaining members 14, 15. The mold 2 is placed on the table 6 (table surface plane 6A) with the fixed plate 19 and the base plate 18 interposed therebetween. The mold 2 is clamped between the fixed plate 19 and the guide members 23 of each of the retainers 14, 15, and is fixed to the table 6 (fixed plate 19).

The striking unit 3 is used for striking (machining) the inner circumferential surface f of the thick portion YC of the reducer pipe fitting Y. The striking unit 3 is used for machining (striking) the thick portion YC of the reducer pipe fitting Y (the inner circumferential surface f of the thick portion YC).
As shown in FIGS. 7 to 15 , the scraping unit 3 has N scraping tools γ (scraping members) and a holder shaft 41 (N is an integer equal to or greater than 3, N=3, 4, 5, . . . : positive integer).

As shown in Figures 7 to 9, the N pieces of the threading tools γ are made of alloy tool steel (cold die steel). Each threading tool γ is made of metal "SKD11" (an alloy tool steel with chromium, molybdenum, and vanadium added to carbon tool steel) specified in "JIS G 4404:2015" of the Japanese Industrial Standards (JIS), or "DC53 (cold die steel)" by Daido Steel Co., Ltd., which is an improved version of "SKD11". Each threading tool γ is made of "DC53 (cold die steel)". Each threading tool γ is made of metal (cold die steel) with a hardness (HRC) of 57 to 62 by subjecting "DC53 (cold die steel)" to heat treatment (quenching). The HRC (hardness) is Rockwell hardness.

As shown in Figures 7 to 9, each of the threshing tools γ has a threshing portion 43, a through hole 44, a first cylindrical portion 45, and a second cylindrical portion 46, and the threshing portion 43 and the first and second cylindrical portions 45, 46 are integrally formed.

As shown in FIGS. 7 to 9, the scraping portion 43 is formed in a spherical trapezoid shape having a pair of flat surfaces 43A, 43B (first flat surface 43A and second flat surface 43B), a spherical zone ε (spherical surface) and a spherical center e.
The planes 43A and 43B are arranged in parallel with each other with a height H3 (distance/interval) between them. The sphere center e is arranged between each of the planes 43A and 43B. The sphere center e is arranged between the first and second planes 43A and 43B with a first center interval δ1 (first interval) from the first plane 43A and a second center interval δ2 (second interval) from the second plane 43B in the direction H (height direction) of the sphere center line g that passes through the sphere center e and is perpendicular to each of the planes 43A and 43B. The first center interval δ1 (first interval) is an interval (distance) narrower than the second center interval δ2 (second interval).
In each of the scraping tools γ, the scraping portion 43 has a spherical radius from a spherical center e between the planes 43A and 43B (between the first and second planes 43A and 43B) and forms a spherical zone ε (spherical surface) between the planes 43A and 43B (between the first and second planes 43A and 43B). In each of the scraping tools γ, the scraping portion 43 is formed in a spherical trapezoid shape having a spherical diameter d (d1, d2, d3, ..., di, ..., dN) as shown in Fig. 9.

As shown in FIG. 9, the through hole 44 is formed in the threshing portion 43 and is arranged concentrically with the threshing portion 43. The through hole 44 penetrates the threshing portion 43 in the direction of the ball center line g (height direction H) and opens to each of the planes 43A, 43B (first and second planes 43A, 43B).

As shown in Figures 7 to 9, the first cylindrical portion 45 is formed in a cylindrical shape and has an outer diameter Df (cylinder outer diameter) smaller than the spherical diameter d (d1, d2, d3, ..., di, ..., dN) of the striking portion 43, and a cylinder length Hα (first cylinder length/first cylinder height) in the direction of the cylinder center line g.
As shown in FIG. 9, the first cylindrical portion 45 has a large diameter hole portion 47 (large diameter hole) and a small diameter hole portion 48 (small diameter hole). The large diameter hole portion 47 is arranged concentrically with the cylinder center line g (first cylindrical portion 45) and formed in the first cylindrical portion 45. The large diameter hole portion 47 is arranged on one cylinder end 45A side of the first cylindrical portion 45. The large diameter hole portion 47 extends from one cylinder end 45A of the first cylindrical portion 45 in the direction of the cylinder center line g and opens at one cylinder end 45A of the first cylindrical portion 45. The small diameter hole portion 48 has the same hole diameter as the through hole 44 and is formed between the large diameter hole portion 47 and the other cylinder end 45B of the first cylindrical portion 45. The small diameter hole portion 48 is arranged concentrically with the large diameter hole portion 47 (first cylindrical portion 45). The small diameter hole portion 48 extends between the large diameter hole portion 47 and the other cylinder end 45B of the first cylindrical portion 45 in the direction of the cylinder center line g, and opens into the large diameter hole portion 47 and the other cylinder end 45B. The small diameter hole portion 48 is reduced in diameter from the large diameter hole portion 47 by having a step portion 49, and is formed in the first cylindrical portion 45 between the large diameter hole portion 47 and the other cylinder end 45B.
The first cylindrical portion 45 is disposed concentrically with the striking portion 43 (sphere center line g/through hole 44). The first cylindrical portion 45 is fixed to the striking portion 43 with the other cylinder end 45B abutting against the first flat surface 43A. The first cylindrical portion 45 is formed integrally with the striking portion 43. The small diameter hole portion 48 of the first cylindrical portion 45 communicates with the through hole 44.

As shown in Figures 7 to 9, the second cylindrical portion 46 is formed in a cylindrical shape and has an outer diameter (cylinder outer diameter) that is the same as the hole diameter of the large diameter hole portion 47 (first cylindrical portion 45), and a cylinder length Hβ (second cylinder length/second cylinder height) that is the same as the hole depth (hole length) of the large diameter hole portion 47.
9, the second cylindrical portion 46 has a hole portion 50 (hole). The hole portion 50 has the same hole diameter as the through-hole 44 and is arranged concentrically with the cylinder center line g (second cylindrical portion 46) and is formed in the second cylindrical portion 46. The hole portion 50 penetrates the second cylindrical portion 46 in the direction of the cylinder center line g of the second cylindrical portion 46 and opens at each cylinder end 46A, 46B.
The second cylindrical portion 46 is disposed concentrically with the striking portion 43 (sphere center line g/first cylindrical portion 45). The second cylindrical portion 46 is fixed to the striking portion 43 with one cylinder end 46A abutting against the second flat surface 43B. The second cylindrical portion 46 is formed integrally with the striking portion 43 and the first cylindrical portion 45. The hole portion 50 of the second cylindrical portion 46 communicates with the through hole 44 (small diameter hole portion 48).

Each scraper γ has a coating layer made of titanium carbonitride on the surface of the spherical zone ε of the scraping portion 43. The spherical zone ε (spherical surface) of the scraping portion 43 is coated with a layer of titanium carbonitride.

The N number of the scrapers γ are arranged concentrically with the holding shaft 41 and fitted onto the holding shaft 41 as shown in Fig. 10 to Fig. 13. The scrapers γ are arranged (adjacent) in the direction of the axial center line j of the holding shaft 41 and fixed to the holding shaft 41. The N number of the scrapers γ are arranged (adjacent) in order from the first scraper γ to the Nth scraper γ and fixed to the holding shaft 41 from one shaft end 41A to the other shaft end 41B in the direction of the axial center line j of the holding shaft 41. The N number of the pullers γ are arranged consecutively (adjacent) from the first scraper γ to the Nth scraper γN in the direction of the axial center line j of the holding shaft 41 (between the shaft ends 41A and 41B).
Of the N scrapers γ, the Ni (i is an integer of 2 or more)-th scraper γ has its second cylindrical portion 46 inserted into the large diameter hole portion 47 of the first cylindrical portion 45 of the N(i-1)-th scraper γ, the other tube end 46B of the second cylindrical portion 46 abuts against the step portion 49 of the N(i-1)-th scraper γ, and its first plane 43A abuts against one tube end 45A (one tube end face) of the first cylindrical portion 45 of the N(i-1)-th scraper γ, and is positioned in the direction of the axial center line j of the retaining shaft 41 (between the shaft ends 41A, 41B).

The Nth threading tool γ is positioned next to the other shaft end 41B side of the (N-1)th threading tool γ in the direction of the axial center line j of the holding shaft 41 (between the shaft ends 41A, 41B) by inserting the second cylindrical portion 46 into the large diameter hole portion 47 of the (N-1)th threading tool γ adjacent to the one shaft end 41A side, with the other cylindrical end 46B (the other cylindrical end surface) of the second cylindrical member 46 abutting against the step portion 49 of the (N-1)th threading tool γ and the other flat surface 43B of the threading part 43 abutting against one cylindrical end 45A (one cylindrical end surface) of the first cylindrical portion 45 of the (N-1)th threading tool γ.

The N scrapers γ are fixed to the retaining shaft 41 by inserting the second cylindrical portion 46 into the large diameter hole portion 47 of the adjacent scraper γ on one shank end 41A side of the retaining shaft 41 (the adjacent scraper γ on one shank end 41A side: hereinafter referred to as the “adjacent scraper γ”), abutting the other tube end 46B (the other tube end face) of the second cylindrical portion 46 against the step portion 49 of the adjacent scraper γ on one shank end 41A side, and abutting the second flat surface 43B of the scraper 43 against one tube end 45A (one tube end face) of the first cylindrical portion 45 of the adjacent scraper γ on one shank end 41A side, so that the 1st to Nth scrapers γ (the 1st to Nth scraping portions 43) are arranged (adjacent) in the direction of the axial center line j of the retaining shaft 41 (between the respective shank ends 41A, 41B).
The N scrapers γ are held on the holding shaft 41 adjacent (consecutively) in the direction of the axial center line j of the holding shaft 41, from one shaft end 41 to the other shaft end 41B, starting from the first scraper γ through to the N scrapers γ.

As shown in Figures 10 to 13, the retaining shaft 41 passes through the through holes 44 of each of the scrapers γ (scrapering portions 43) in sequence, and arranges each scraper γ (scrapering portion 43 of each scraper γ) adjacent (continuously) in the direction of the axial center line j of the retaining shaft 41, thereby retaining the N scraper portions 43 between each of the axial ends 41A, 41B of the retaining shaft 41.

As shown in FIGS. 10 to 13, the holder shaft 41 has, for example, a first shaft portion 55 on one shaft end 41A side and a second shaft portion 56 on the other shaft end side 41B side.
The first shaft portion 55 is a bolt screw (hereinafter, referred to as "bolt screw 55"). The second shaft portion 56 is formed in a cross-sectional circular shape (cross-sectional circular shaft) having the same shaft diameter as the outer diameter Df of the first cylindrical portion 45. The second shaft portion 56 has a screw hole 57. The screw hole 57 is arranged concentrically with the second shaft portion 56. The second shaft portion 56 extends from one shaft end 56A (one second shaft end) of the second shaft portion 56 to the other shaft end 41B in the direction of the shaft center line j of the second shaft portion 56 (retaining shaft 41) and opens at one shaft end 56A.

As shown in Figures 10 to 13, the threaded shaft portion 58 of the bolt screw 55 (first shaft portion) is inserted (penetrated) into each of the threading tools γ in order from the other cylindrical end 46B of the second cylindrical portion 46 (the second flat surface 43B of the threading portion 43), and the threaded shaft portion 58 passes through the hole portion 50 of the second cylindrical portion 46 of each threading tool γ, the through hole 44 of the threading portion 43, the small diameter hole portion 48 of the first cylindrical portion 45, and the large diameter hole portion 47, in that order, to hold the N threading tools γ arranged (contiguous/adjacent) in the direction of the axial center line j (axial center line j of the threaded shaft portion 58).

As shown in Figures 10 to 13, the bolt screw 55 is connected to the second shaft portion 56 by screwing the threaded shaft portion 58 from one shaft end 56A into the threaded hole 57 of the second shaft portion 56 while holding N threading tools γ by the threaded shaft portion 58. The other shaft end (other shaft end surface) of the second shaft portion 56 is the other shaft end 41B (other shaft end surface) of the holding shaft 41.

As shown in Figures 10 to 13, the retaining shaft 41 rotates the bolt screw 55 (threaded shaft portion 58) relative to the second shaft portion 56, threading the threaded shaft portion 58 into the screw hole 57, clamping the N threading tools γ between the head 59 of the bolt screw 55 and one shaft end 56A (one shaft end face) of the second shaft portion 56, and fixing each threading tool γ to the retaining shaft 41. The end face 59A of the head 59 of the bolt screw 55 is one shaft end 41A (one shaft end face) of the retaining shaft 41.

As shown in Figures 10 to 13, each of the threading tools γ held by the bolt screw 55 (threaded shaft portion 58) is fixed to the holding shaft 41 adjacent (continuous) in the direction of the axial center line j of the holding shaft 41 (bolt screw 55) by screwing the threaded shaft portion 58 into the threaded hole 57 (rotating the bolt screw 55), inserting the second cylindrical portion 46 into the large diameter hole portion 47 (first cylindrical portion 45) of the adjacent threading tool γ on one shaft end 41A side, and abutting the other cylinder end 46B of the second cylindrical portion 46 against the step portion 49 (first cylindrical portion 45) of the adjacent threading tool γ on one shaft end 41A side, and abutting the second flat surface 43B of the threading part 43 against one cylinder end 45A (one cylinder end surface) of the first cylindrical portion 45 of the adjacent threading tool γ on one shaft end 41A side.

As shown in Figures 10 to 13, the N number of scrapers γ are fixed to the retaining shaft 41 (first and second shaft portions 55, 56) in the direction of the axial center line j of the retaining shaft 41, with the first to Nth scrapers γ (the first to Nth scraping portions 43) being adjacent (consecutive) from one axial end 41A of the retaining shaft 41 (head 59 of the bolt screw 55) to the other axial end 41B of the retaining shaft 41 (one axial end 56A of the second shaft portion 56).
Each of the scraping tools γ is arranged in the direction of the axial center line j of the retaining shaft 41, at a distance Hα (spacing between scraping parts/third spacing) between each of the scraping parts 43 (the spherical centers e of each scraping part 43) which is the cylindrical length Hα of the first cylindrical portion 45.

10, in the first threading tool γ from one shaft end 41A (head 59 of bolt screw 55) of the retaining shaft 41, the threading portion 43 is formed into a spherical trapezoid shape having a spherical diameter d1 that exceeds the pipe inner diameter dc (inner diameter) of the thick-walled portion YC of the tapered tube portion YB (reducer pipe fitting Y) and is larger than the pipe inner diameter dc of the thick-walled portion YC and is smaller than the standard inner diameter df (target inner diameter) of the product standard of the other pipe end Yb of the reducer pipe fitting Y. In the first threading tool γ, the threading portion 43 is formed into a spherical trapezoid shape having a spherical diameter dN that exceeds the pipe inner diameter dc (pipe inner diameter dc of the thick-walled portion YC before threading) of the thick-walled portion YC of the reducer pipe fitting Y and is smaller than the inner diameter df (standard inner diameter/finished product inner diameter) of the other pipe end Yb in the product standard (finished product standard) of the reducer pipe fitting Y.
The standard inner diameter df of the product standard of the other pipe end Yb (the inner diameter df of the other pipe end Yb in the product standard of the reducer pipe fitting Y) is a target inner diameter, and is an inner diameter (inner diameter dimension) defined in "JIS B 2313:2015" of the Japanese Industrial Standards (JIS standards). The standard inner diameter df is a diameter (inner diameter) larger than the pipe inner diameter dc (inner diameter) of the thick-walled portion YC. The pipe inner diameter dc of the thick-walled portion YC is a diameter (inner diameter) smaller than the standard inner diameter df (target inner diameter).

In the Nth threshing tool γ from one shaft end 41A of the retaining shaft 41, the threshing portion 43 is formed in a spherical trapezoid shape with a spherical diameter dn that is the same as the specified inner diameter, as shown in FIG. 10.

In each of the first and Nth ironing tools γ (irrigation tools γ) from one shaft end 41A of the retaining shaft 41, the ironing portion 43 is formed in a spherical trapezoid shape having a spherical diameter that exceeds the spherical diameter of the adjacent ironing part 43 (irrigation tool γ) on one shaft end 41A side (the head 59 side of the bolt screw 55) and is less than the standard inner diameter df, as shown in FIG. 10. In each of the first and Nth ironing tools γ (irrigation tools), the Ni (i is an integer of 2 or more) ironing part 43 is formed in a spherical trapezoid shape that exceeds the spherical diameter of the N(i-1)th ironing part 43 and is less than the standard inner diameter df. The N(i-1)th ironing part 43 (irrigation tool γ) is the ironing part 43 (irrigation tool γ) disposed (adjacent) one shaft end 41A side of the Nith ironing part 43 (irrigation tool γ).
Each of the scraping portions 43 of the scraping tools γ between the first and Nth has spherical diameters d2, d3, ..., di, ...d(N-1) that exceed the spherical diameter d1 of the first scraping portion 43 and are within the range of less than the standard inner diameter df, and that gradually increase in diameter from one shank end 41A (head 59 of the bolt screw 55) of the retaining shaft 41 to the other shank end 41B (from the first scraping tool γ to the Nth scraping tool γ).

As shown in Figures 14 and 15, the scraping unit 3 has, for example, three scraping tools r (scraping members) and a holding shaft 41.

As shown in Figures 14 and 15, the three scrapers γ are arranged concentrically with the holding shaft 41 and fitted onto the outside of the holding shaft 41. Each scraper γ is fixed to the holding shaft 41 adjacent (consecutive) in the direction of the axial center line j of the holding shaft 41. The three scrapers γ are arranged (adjacent) in the order of the first scraper γ, the second scraper γ, and the third scraper γ, and fixed to the holding shaft 41 in the direction of the axial center line j of the holding shaft 41 from one axial end 41A to the other axial end 41B. The three scrapers γ are arranged (adjacent) from the first to third scrapers γ in the direction of the axial center line j of the holding shaft 41 (between the axial ends 41A and 41B).

As shown in Figures 14 and 15, the second cylindrical portion 36 of the second threader γ is inserted into the large diameter hole portion 47 of the first cylindrical portion 45 of the first threader γ, the other cylinder end 46B (the other cylinder end surface) of the second cylindrical portion 46 is abutted against the step portion 49 (the first cylindrical portion 45) of the first threader γ, and the other flat surface 43B of the threader 43 is abutted against one cylinder end 45A (one cylinder end surface) of the first cylindrical portion 45 of the first threader γ, and the second threader γ is positioned next to the other shaft end 41B of the first threader γ (positioned adjacent to the other shaft end 41B of the first threader γ) in the direction of the axial center line j of the holding shaft 41 (between the shaft ends 41A, 41B).

As shown in Figures 14 and 15, the third threader γ is arranged between the second threader γ and the other shaft end 41B in the direction of the axial center line j of the retaining shaft 41 (between the shaft ends 41A and 41B) by inserting the second cylindrical portion 36 into the large diameter hole portion 47 of the first cylindrical portion 45 of the second threader γ, abutting the other cylinder end 46B of the second cylindrical portion 46 against the step portion 49 of the second threader γ, and abutting the other flat surface 43B of the threader 43 against one cylinder end 45A of the first cylindrical portion 45 of the second threader γ. It is arranged next to the other shaft end 41B of the second threader γ (adjacent to the other shaft end 41B of the second threader γ).

As shown in Figures 14 and 15, the retaining shaft 41 passes through the through holes 44 of each of the scrapers γ (scrapering portions 43) and arranges each scraper γ (scrapering portion 43 of each scraper γ) adjacent (continuously) in the direction of the axial center line j of the retaining shaft 41, thereby retaining the three scraper portions 43 between the axial ends 41A, 41B of the retaining shaft 41.

As shown in Figures 14 and 15, in the retaining shaft 41, the threaded shaft portion 58 of the bolt screw 55 (first shaft portion) is inserted into each of the threading tools γ in order from the other cylindrical end 46B of the second cylindrical portion 46 (the second flat surface 43B of the threading portion 43), and the threaded shaft portion 58 passes through the hole portion 50 of the second cylindrical portion 46, the through hole 44 of the threading portion 43, the small diameter hole portion 48 of the first cylindrical portion 45, and the large diameter hole portion 47, in that order, to hold the three threading tools γ in the direction of the axial center line j (axial center line j of the threaded shaft portion 58).

As shown in Figures 14 and 15 , the bolt screw 55 is connected to the second shaft portion 56 by screwing the screw shaft portion 58 into the threaded hole 57 of the second shaft portion 56 with the three threading tools γ holding the screw shaft portion 58.
By rotating the bolt screw (screw shaft portion 58) relative to the second shaft portion 56, the screw shaft portion 58 is screwed into the screw hole 57, and the three threading tools γ are clamped between the head 59 of the bolt screw 55 and one of the shaft ends 56A (one of the shaft end faces) of the second shaft portion 56, and each of the threading tools γ is fixed to the holding shaft 41.

As shown in Figures 14 and 15, each of the threading tools γ held by the bolt screw 55 (threaded shaft portion 58) is fixed to the holding shaft 41 by screwing the threaded shaft portion 58 into the threaded hole 57 (rotating the bolt screw 55) so that the second cylindrical portion 46 is inserted into the large diameter hole portion 47 (first cylindrical portion 45) of the adjacent threading tool γ on one shaft end 41A side, and the other cylinder end 46B of the second cylindrical portion 46 abuts against the step portion 49 (first cylindrical portion 45) of the adjacent threading tool γ on one shaft end 41A side, and the second flat surface 43B of the threading part 43 abuts against one cylinder end 45A (one cylinder end surface) of the first cylindrical portion 45 of the adjacent threading tool γ on one shaft end 41A side. ...

As shown in FIGS. 14 and 15 , the three scrapers γ are fixed to the holder shaft 41 in a manner that is adjacent (arranged) in the order of the first scraper γ, the second scraper γ, and the third scraper γ from one shank end 41A of the holder shaft 41 (head 59 of the bolt screw 55) toward the other shank end 41B of the holder shaft 41 (one shank end 56A of the second shaft portion 56) in the direction of the axial center line j of the holder shaft 41 (first and second shaft portions 55, 56).
Each of the scraping tools γ is arranged (adjacent) in the direction of the axial center line j of the retaining shaft 41, spaced apart by a distance Hα (spacing between scraping portions/third spacing) between each of the scraping B43 (the spherical centers e of each scraping portion 43) which is the cylindrical length Hα of the first cylindrical portion.

In the first threading tool γ from one shaft end 41A of the retaining shaft 41 (head 59 of the bolt screw 55), the threading portion 43 is formed into a spherical trapezoid shape with a spherical diameter d1 that exceeds the pipe inner diameter dc (inner diameter) of the thick portion YC of the tapered pipe portion YB (reducer pipe fitting Y) and is less than the standard inner diameter df (target inner diameter) of the product standard of the other pipe end Yb of the reducer pipe fitting Y, as shown in Figure 14.

In the third (Nth) threshing tool γ from one shaft end 41A of the retaining shaft 41, the threshing portion 43 is formed in a spherical trapezoid shape with a spherical diameter d3 that is the same as the specified inner diameter, as shown in FIG. 14.

In the second ironing tool γ from one shaft end 41A of the retaining shaft 41, the ironing portion 43 is formed in a spherical trapezoid shape having a spherical diameter d2 that exceeds the spherical diameter d1 of the first ironing portion 43 and is less than the standard inner diameter df, as shown in Figure 14.
As shown in FIG. 14 , each of the scraping portions 43 of the three scraping tools γ has spherical diameters d1, d2, d3 that are gradually enlarged from one shank end 41A of the retaining shaft 41 (head 59 of the bolt screw 55) to the other shank end 41B (one shank end 56A of the second shaft portion 56) within the range between the pipe inner diameter dc and the standard inner diameter df of the thick-walled portion YC.

As shown in Figures 1 to 3, the striking units 3 are arranged inside each tie rod 8 (between each tie rod 8). There are N striking units 3, and for example, three striking tools γ and a holding shaft 41 (first and second shaft portions 55, 56) are arranged concentrically with the tube holding hole 31 (the cylindrical center line s of the die 2).

As shown in Figures 1 to 3, the threshing unit 3 is arranged such that the axial center line j of the holding shaft 41 and the ball center line g of each threshing tool γ are oriented in the height direction H. The threshing unit 3 is arranged between the base 7 and the table 6 with one axial end 41A of the holding shaft 41 (the first threshing tool γ) facing the table 6. The threshing unit 3 is arranged between the table 6 and the slide frame 12. The threshing unit 3 is connected to the slide frame 12 by fixing the other axial end 41B of the holding shaft 41 (the other axial end of the second shaft portion 56) to the slide frame 12.

As shown in Figures 1 to 4, the actuator 4 is connected to the other shaft end 41B of the holding shaft 41 and fixed to the base 7. The actuator 4 is connected to the other shaft end 41B of the holding shaft 41 (stripping unit 3) via the slide frame 12.

As shown in Figs. 1 to 4, the actuator 4 moves (lowers or raises) the threshing unit 3 (holding shaft 41 and each threshing tool γ) and the slide frame 12 in the height direction H (the direction of the axial center line j of the holding shaft 41). As shown in Figs. 1 to 4, the actuator 4 moves (reciprocates) the threshing unit 3 (holding shaft 41 and each threshing tool γ) between the first position Q1 and the second position Q2 in the height direction H (the direction of the cylindrical center line s of the mold 2). The actuator 4 moves (lowers) the threshing unit 3 (holding shaft 41 and each threshing tool γ) from the first position Q1 to the second position Q2, and moves (raises) the threshing unit 3 from the second position Q2 to the first position Q1.

1 to 3, the first position Q1 is a position where a distance Hε (fourth distance) is provided between one shaft end 41A of the holder shaft 41 (the striking unit 3) and the die surface 2A of the die 2 in the direction of the axial center line j of the holder shaft 41 (height direction H). At the first position Q1, the striking unit 3 is disposed with a distance Hδ (fifth distance) provided between one shaft end 41A of the holder shaft 41 and each of the stoppers 14, 15 (guide member 23).
4 and 5, the second position Q2 is a position where three (N) striking tools γ and one axial end 41A side of the retaining shaft 41 (head 59 of the bolt screw 55) are arranged in the retreat hole 32 of the die 2. At the second position Q2, each striking tool γ is arranged (retracted) in the retreat hole 32 with a gap between the first striking tool γ and the die back surface 2B (extrusion disc 27). At the second position Q2, one axial end 41A side of the retaining shaft 41 (head 59 of the bolt screw 55) is arranged (retracted) in the retreat hole 32 with a gap between the one axial end 41A of the retaining shaft 41 and the die back surface 2B (extrusion disc 27).

As shown in Figures 1, 2 and 4, the actuator 4 is, for example, a general-purpose hydraulic cylinder (hereinafter referred to as "hydraulic cylinder 4"). The hydraulic cylinder 4 (main hydraulic cylinder/principal hydraulic cylinder) has a cylinder rod 61 and a cylinder body 62. The cylinder rod 61 slides within the cylinder body 62 and is advanced from or retreated into the cylinder body 62 by supplying and discharging hydraulic pressure to and from the cylinder body 62.

As shown in Figures 1, 2 and 4, the hydraulic cylinder 4 is fixed to the base 7 by connecting one rod end 61A of the cylinder rod 61 (the tip 61A of the cylinder rod 61) to the other shaft end 41B of the retaining shaft 41. The hydraulic cylinder 4 is disposed inside each tie rod 8 (between each tie rod 8).

As shown in Figures 1, 2 and 4, the hydraulic cylinder 4 is arranged so that the rod center line m of the cylinder rod 61 (cylinder center line m of the cylinder body 62) faces the height direction H (the direction of the axial center line j of the holding shaft 41) and the cylinder rod 61 is concentric with the holding shaft 41 (axial center line j). The hydraulic cylinder 4 is arranged so that the tip 61A of the cylinder rod 61 faces the holding shaft 41 (slide frame 12) and protrudes between the base 7 and the slide frame 12. The hydraulic cylinder 4 is arranged so that the tip 61A of the cylinder rod 61 is connected to the slide frame 12 and the cylinder body 62 is fixed to the base 7. The hydraulic cylinder 4 (cylinder rod 61) is connected to the other axial end 41B of the holding shaft 41 via the slide frame 12 and fixed to the base 7.

1, 2 and 4, the hydraulic cylinder 4 moves (lowers or raises) the slide frame 12 and the striking unit 3 in the height direction H (the direction of the cylindrical center line s of the mold 2) by advancing (extending) the cylinder rod 61 from within the cylinder body 62 or retracting it into the cylinder body 62. The hydraulic cylinder 4 moves (lowers) the slide frame 12 and the striking unit 3 toward the tube holding hole 31 (mold 2) by advancing (extending) the cylinder rod 61 from within the cylinder body 62, and moves (lowers) the striking unit 3 (each striking tool γ) from the first position Q1 to the second position Q2.
1, 2 and 4, the striking unit 3 is moved from the first position Q1 to the second position Q2 by the advancement of the cylinder rod 61, and is inserted in this order into the tube holding hole 31 and the retreat hole 32. As one shaft end 41A side of the holding shaft 41 and each striking tool γ move from the first position Q1 to the second position Q2, they are inserted from the mold surface 2A into the tube holding hole 31, and are arranged (retreated) from the tube holding hole 31 into the retreat hole 32.

As shown in Figures 1, 2 and 4, the hydraulic cylinder 4 moves (raises) the slide frame 12 (slider) and the striking unit 3 toward the base 7 by retracting the cylinder rod 61 into the cylinder body 62, thereby moving (raising) the striking unit 3 from the second position Q2 to the first position Q1.
Each threading tool γ is inserted from the retreat hole 32 into the tube holding hole 31 by moving from the second position Q2 to the first position Q1, and is then extracted from the tube holding hole 31 from the mold surface 2A.

In Figures 16 and 24, the pipe joint processing device X1 performs a boring process (machining) on the inner circumferential surface f of the thick portion YC of the reducer pipe joint Y. The pipe joint processing device X1 performs a boring process (machining) on the thick portion YC of the reducer pipe joint Y (the inner circumferential surface f of the thick portion YC).

As shown in FIGS. 1 to 3, the pipe joint processing device X1 holds a reducer pipe joint Y in a die 2 (pipe holding hole 31).
The reducer pipe fitting Y is inserted into the pipe holding hole 31 of the mold 2 from the other pipe end Yb, as shown in Figures 1 and 3. The reducer pipe fitting Y is disposed in the pipe holding hole 31 from the mold surface 2A. As the reducer pipe fitting Y is inserted into the pipe holding hole 31, the outer peripheral surface β of the tapered pipe section YC and the outer peripheral surface α of the pipe section YA abut against the pipe holding hole 31 (the inner peripheral surface of the pipe holding hole 31) and are held in the mold 2. The pipe section YA is held in the mold 2 with the outer peripheral surface α of the pipe section YA abutting against the first hole section 33 (the inner peripheral surface of the first hole section 33). The tapered pipe section YB is removably held in the mold 2 with the outer peripheral surface β of the tapered pipe section YB abutting against the second hole section 34 (the inner peripheral surface of the second hole section 34).
The reducer pipe fitting Y is positioned concentrically with the pipe holding hole 31 and held in the mold 2 by abutting the outer surface α of the pipe section YA and the outer surface β of the tapered pipe section YB against the pipe holding hole 31 (the inner surface of the pipe holding hole 31).

As shown in FIG. 3, when the pipe fitting processing device X1 holds the reducer pipe fitting Y in the die 2, the stopper members 24 of each of the stoppers 14, 15 move relative to the guide member 23 to protrude into the pipe holding hole 31 of the die 2 holding the reducer pipe fitting Y. By protruding into the pipe holding hole 31, the stopper members 24 of each of the stoppers 14, 15 are positioned at a distance from one pipe end Ya of the reducer pipe fitting Y (pipe section YA) held in the die 2.

As shown in Figures 5, 6, and 16 to 18, the pipe fitting processing device X1 holds the reducer pipe fitting Y in the die 2 (protruding the anti-pullout members 24 of each anti-pullout tool 14, 15 into the pipe holding hole 31), and then moves (lowers) the striking unit 3 from the first position Q1 to the second position Q2 using the hydraulic cylinder 4 (actuator).
The hydraulic cylinder 4 advances (extends) the cylinder rod 61 from within the cylinder body 62 and moves (descends) the striking unit 3 and the slide frame 12 toward the reducer pipe fitting Y that holds the striking unit 3 to the mold 2, thereby moving the striking unit 3 from the first position Q1 to the second position Q2.

16 and 17, the striking unit 3 is inserted from one shaft end 41A (head 59 of bolt screw 55) of the retaining shaft 41 into the reducer fitting Y held in the die 2 as it moves from the first position Q1 to the second position Q2. As the striking unit 3 moves from the first position Q1 to the second position Q2, it is inserted into the pipe section YA with a gap between the spherical zone ε (spherical surface) of each striking part 43 and the inner circumferential surface of the reducer fitting Y (pipe section YA) held in the die 2. As the striking unit 3 moves from the first position Q1 to the second position Q2, the striking part 43 of each striking tool γ is inserted into the pipe section YA with a gap between the spherical zone ε (spherical surface) of each striking part 43 and the inner circumferential surface of the pipe section YA held in the die 2. As the striking unit 3 moves from the first position Q1 to the second position Q2, it passes between the retaining members 24 of the retaining tools 14, 15 and is inserted into the pipe section YA held by the die 2.

As shown in Figures 16 and 18(a), as the striking unit 3 moves from the first position Q1 to the second position Q2, it moves (descends) within the reducer pipe fitting Y held in the mold 2 from one pipe end Ya to the other pipe end Yb (retreat hole 32), and while one shaft end 41A side (head 59 of the bolt screw 55) of the holding shaft 41 is inserted into the thick-walled portion YC (one pipe end Yb side) of the reducer pipe fitting Y held in the mold 2, the spherical zone ε of the first striking tool γ (stripping portion 43) is pressed against the inner surface f of the thick-walled portion YC.
16 to 18, as the first striking tool γ moves from one pipe end Ya of the reducer pipe fitting Y held in the die 2 to the other pipe end Yb (retraction hole 32), the spherical zone ε (spherical surface) of the striking part 43 is pressed against the inner peripheral surface f of the thick portion YC, while the striking part 43 strikes and stretches the thick portion YC to make it thinner. The thick portion YC is stretched into the retraction hole 32 in the direction of the pipe center line a of the reducer pipe fitting Y (the cylindrical center line s of the die 2) by the striking of the first striking part 43. As shown in Figures 17 and 18(b), the first threading tool γ (threading portion 43) moves from one pipe end Ya of the reducer pipe fitting Y held in the die 2 to the other pipe end Yb (retraction hole 32), it stretches and expands its diameter while threading the thick portion YC of the reducer pipe fitting Y held in the die 2, penetrating the thick portion YC (tapered pipe portion YB) and forming the thick portion YC into the inner diameter of the spherical diameter d1 of the first threading portion 43. As shown in Figures 17 and 18(b), the first threading tool γ (threading portion 43) and one shaft end 41A side of the holder shaft 41 (head portion 59 of the bolt screw 55) penetrate the thick portion YC (tapered pipe portion YB) and are inserted into the retraction hole 32 from the other pipe end Yb of the reducer pipe fitting Y held in the die 2, and are retracted (disposed) in the retraction hole 32. The thick portion YC of the reducer fitting Y held in the die 2 is rolled by the first rolling portion 43 (rolling tool γ), and extends and expands into the retreat hole 32, forming an inner diameter of a hemisphere with a diameter d1.
As shown in Figures 17 and 18 (b), as the reducer pipe fitting Y held in the mold 2 moves from one pipe end Ya to the other pipe end Yb (retreat hole 32), the striking unit 3 does not press the spherical zone ε of the second striking portion 43 (stripping tool γ) against the inner surface f of the thick-walled portion YC until the first striking portion 43 (stripping tool γ) penetrates the thick-walled portion YC.

As shown in Figures 17 and 18 (b), as the reducer pipe fitting Y held in the mold 2 moves from one pipe end Ya to the other pipe end Yb (retreat hole 32), the striking unit 3 inserts (retreats) the first striking tool γ (the striking portion 43 and one shaft end 41A side of the holding shaft 41) into the retreat hole 32, and presses the spherical zone ε of the second striking tool γ (stripping portion 43) against the inner surface f of the thick-wall portion YC.
19 to 21, as the second striking tool γ moves from one pipe end Ya of the reducer pipe fitting Y held in the die 2 to the other pipe end Yb (retraction hole 32), the spherical zone ε (spherical surface) of the striking part 43 is pressed against the inner peripheral surface f of the thick portion YC, while the striking part 43 strikes and stretches the thick portion YC to make it thinner. The thick portion YC is stretched into the retraction hole 32 in the direction of the pipe center line a of the reducer pipe fitting Y (the cylindrical center line s of the die 2) by the striking of the second striking part 43. As shown in Figures 20 and 21(b), the second threading tool γ (threading portion 43) moves from one pipe end Ya of the reducer pipe fitting Y held in the die 2 to the other pipe end Yb (retraction hole 32), it stretches and expands its diameter while threading the thick portion YC of the reducer pipe fitting Y held in the die 2, penetrating the thick portion YC (tapered pipe portion YB) and forming the thick portion YC to the inner diameter of the spherical diameter d2 of the second threading portion 43. As shown in Figures 20 and 21(b), the second threading tool γ (threading portion 43) penetrates the thick portion YC (tapered pipe portion YB) and is inserted from the other pipe end Yb of the reducer pipe fitting Y held in the die 2 into the retraction hole 32, and is retracted (placed) in the retraction hole 32. The thick portion YC of the reducer fitting Y held in the die 2 is rolled by the second rolling portion 43 (rolling tool γ), and is expanded and enlarged into the retreat hole 32, forming an inner diameter of a hemisphere with a diameter d2.
As shown in Figures 20 and 21 (b), as the reducer pipe fitting Y held in the mold 2 moves from one pipe end Ya to the other pipe end Yb (retreat hole 32), the striking unit 3 does not press the spherical zone ε of the third striking portion 43 (stripping tool γ) against the inner surface f of the thick-walled portion YC until the second striking portion 43 (stripping tool γ) penetrates the thick-walled portion YC.

As shown in Figures 22 and 24(a), when the reducer pipe fitting Y held in the mold 2 moves from one pipe end Ya to the other pipe end Yb (retraction hole 32), the second scraping tool γ (scraping portion 43 and one shaft end 41A side of the holding shaft 41 are inserted (retracted) into the retraction hole 32, and the spherical zone ε of the third (Nth) scraping tool γ (scraping portion 43) is pressed against the inner surface f of the thick-wall portion YC.
22 to 24, as the third (Nth) striking tool γ moves from one pipe end Ya of the reducer pipe fitting Y held in the die 2 to the other pipe end Yb (retraction hole 32), the spherical zone ε (spherical surface) of the striking part 43 is pressed against the inner peripheral surface f of the thick portion YC, while the striking part 43 strikes and stretches the thick portion YC to make it thinner. The thick portion YC is stretched into the retraction hole 32 in the direction of the pipe center line a of the reducer pipe fitting Y (the cylindrical center line s of the die 2) by the striking of the third striking part 43. As shown in Figures 23 and 24(b), as the reducer pipe fitting Y held in the mold 2 moves from one pipe end Ya to the other pipe end Yb (retraction hole 32), the third scraping tool γ (scraping portion 43) scrapes the thick portion YC of the reducer pipe fitting Y held in the mold 2, stretches and expands in diameter, penetrating the thick portion YC (tapered pipe portion YB) and forming the other pipe end Yb side (thick portion YC) including the other pipe end Yb to the inner diameter of the spherical diameter d3 (standard inner diameter df) of the third (Nth) scraping portion 43. 23 and 24(b), the third (Nth) striking tool γ (stripping portion 43) penetrates the thick portion YC (tapered tube portion YB) and is inserted into the evacuation hole 32 from the other tube end Yb of the reducer tube fitting Y held in the die 2, and is retreated (placed) in the evacuation hole 32. The thick portion YC of the reducer tube fitting Y held in the die 2 is struck by the third striking tool 43 (stripping tool γ), and is extended and enlarged into the evacuation hole 32, and is formed into an inner diameter equal to the standard inner diameter d3.

As shown in Figures 4 and 5, when the third (Nth) scraper γ is retracted (placed) in the retraction hole 32, the scraper unit 3 reaches the second position Q2 and places (retrieves) the three (N) scrapers γ and one shaft end 41A side of the retaining shaft 41 (head 59 of the bolt screw 55) in the retraction hole 32.

As shown in Figures 1 to 5, 25 and 26, when the hydraulic cylinder 4 (actuator) moves the threshing unit 3 to the second position Q2, it retracts the cylinder rod 61 into the cylinder body 62 and moves (raises) the slide frame 12 and the threshing unit 3 toward the base 7, thereby moving (raising) the threshing unit 3 from the second position Q2 to the first position Q1.

As shown in Figures 25 and 26, as the striking unit 3 moves from the second position Q2 to the first position Q1, the third (Nth) striking tool γ is inserted into the reducer pipe fitting Y held in the die 2 from the other pipe end Yb (the other pipe end surface), and the spherical zone ε of the third (Nth) striking part 43 (stripping tool γ) is brought into contact (pressed) with the inner circumferential surface f (the inner circumferential surface f of the standard inner diameter) on the other pipe end Yb side.

As shown in Figures 25 and 26, with the spherical zone ε of the third (Nth) striking portion 43 (stripping tool γ) in contact (pressed) with the inner surface f on the other pipe end Yb side, the striking unit 3 moves (rises) together with the reducer pipe fitting Y toward the mold surface 2A (the anti-pullout members 24 of each of the anti-pullout tools 14, 15) as it moves from the second position Q2 to the first position Q1, and one pipe end Ya (one pipe end face) of the reducer pipe fitting Y comes into contact with the anti-pullout member 24 of each of the anti-pullout tools 14, 15.
As the striking unit 3 moves from the second position Q2 to the first position Q1, the reducer pipe fitting Y abuts (presses) the inner surface f (inner surface f of the standard inner diameter/inner surface f of the thick portion YC) on the other pipe end Yb side against the spherical zone ε of the third (Nth) striking portion 43, and is moved together with the striking unit 3 toward the mold surface 2A (the anti-pullout members 24 of each of the anti-pullout tools 14, 15) so that one pipe end Ya abuts against the anti-pullout member 24 of each of the anti-pullout tools 14, 15.

As shown in Figures 25 and 26, as the cutting unit 3 moves from the second position Q2 to the first position Q1, when one pipe end Ya of the reducer pipe fitting Y abuts against the anti-pullout member 24 of each anti-pullout device 14, 15, the cutting unit 3 is moved toward the first position Q1 relative to the reducer pipe fitting Y.
Each threading tool γ (threading portion 43) penetrates from the other pipe end Yb into the tapered pipe section YB and then into the pipe section YA in that order, while one pipe end Ya of the reducer pipe fitting Y is abutted against the anti-pullout member 24 of each anti-pullout tool 14, 15, and is extracted from the one pipe end Ya to the outside of the reducer pipe fitting Y.

As shown in Figures 1 to 3, when the threshing unit 3 moves from the second position Q2 to the first position Q1, each threshing tool γ is removed from the reducer pipe fitting Y, and the threshing unit 3 moves to the first position Q1.

As shown in Figures 1 and 2, when the pipe joint processing device X1 moves the striking unit 3 from the second position Q2 to the first position Q1, the cylinder rod 61 stops retracting into the cylinder body 62.

As shown in Figures 2, 3, and 27, when the threading unit 3 is moved from the second position Q2 to the first position Q1, the pipe joint processing device X1 moves the retaining members 24 of each retaining tool 14, 15 relative to the guide member 23 and retreats into the guide member 23 (guide hole 25).

As shown in FIG. 27, when the pipe joint processing device X1 retracts the anti-pullout members 24 of the anti-pullout tools 14, 15 into the guide member 23, the cylinder rod of the sub-hydraulic cylinder (not shown) advances (extends) from within the cylinder body, and the extrusion shaft 26 and extrusion disk 27 (extrusion tool 16) move (rise) toward the reducer pipe joint Y held in the die 2.

In the push-out tool 16, as shown in FIG. 27, the push-out disk 27, as the cylinder rod of the sub-hydraulic cylinder advances, comes into contact with the other pipe end Yb of the reducer pipe fitting Y held in the die 2 through the connecting hole 22 and the retreat hole 32, and is moved toward the die surface 2A together with the reducer pipe fitting Y, pushing up the reducer pipe fitting Y and removing it from the pipe holding hole 31, and placing it between the die surface 2A and the striking unit 3 (one shaft end 41A of the holding shaft 41) located at the first position Q1. The push-out shaft 26 is moved in the height direction H (in the direction of the cylindrical center line s of the die 2) and is inserted into the retreat hole 32 through the push-out hole 17, the storage hole 21, and the connecting hole 22 in that order. The push-out disk 27 is moved in the height direction H (in the direction of the cylindrical center line s of the die 2) and is inserted into the retreat hole 32 through the connecting hole 22.

In this way, in the pipe fitting processing device X1, N (three) scraping tools γ, starting from the first scraping tool γ, are pressed against the inner surface f of the thick portion YC of the reducer pipe fitting Y (unfinished reducer pipe fitting) held in the mold 2 by pressing the spherical zone ε of each scraping portion 43 against the inner surface f of the thick portion YC of the reducer pipe fitting Y (unfinished reducer pipe fitting) held in the mold 2, while penetrating the reducer pipe fitting Y held in the mold 2, so that the thick portion YC is scraped by each scraping portion 43 and the other pipe end Yb side (thick portion YC), including the other pipe end Yb, can be formed to the standard inner diameter df.
In the pipe fitting processing device X1, N (or three) scrapers γ are used in sequence, starting from the first scraper γ, to scrape the thick portion YC of the reducer pipe fitting Y (unfinished reducer pipe fitting) held in the die 2, thereby gradually expanding the inner diameter of the thick portion YC and forming the inner diameter on the other pipe end Yb side, including the other pipe end Yb, to the standard inner diameter.This makes it possible to form the inner diameter on the other pipe end Yb side, including the other pipe end Yb, of the reducer pipe fitting Y held in the die 2 to the standard inner diameter without damaging the other pipe end Yb side of the tapered pipe portion YB.

A pipe joint processing device and a stripping unit according to the second embodiment (the stripping unit according to the second embodiment) will be described with reference to Figs. 28 to 36.
28 to 36, the same reference numerals as those in FIGS. 1 to 15 denote the same members and structures, and detailed description thereof will be omitted.

28 and 33, a pipe joint processing apparatus X2 of the second embodiment includes an apparatus main body 1, a die 2 (pipe holder), and an actuator 4, similarly to that described with reference to FIGS.
The pipe joint processing apparatus X2 of the second embodiment (hereinafter referred to as “pipe joint processing apparatus X2”) includes a threading unit 63.

The striking unit 63 is used to perform striking (machining) on the inner circumferential surface f of the thick portion YC of the reducer pipe fitting Y. The striking unit 63 is used to machine (strive) the thick portion YC of the reducer pipe fitting Y (the inner circumferential surface f of the thick portion YC).
As shown in FIGS. 32 and 33 , the threshing unit 63 has one threshing tool γ (threshing portion) and a holder shaft 41 .

In the threshing unit 63, one threshing tool γ has a threshing portion 45, a through hole 44, a first cylindrical portion 45, and a second cylindrical portion 46, as shown in Figures 7 to 9.

In the threshing unit 63, one threshing tool γ is arranged concentrically with the holding shaft 41 and fitted onto the holding shaft 41 as shown in Figures 32 and 33. The threshing tool γ is fixed to the holding shaft 41.

In the threshing unit 63, as shown in Figures 32 and 33, the holding shaft 41 passes through the through hole 44 of the threshing tool γ (threshing part 43) and holds one threshing part 43 between each shaft end 41A, 41B of the holding shaft 41.

In the striking unit 63, the retaining shaft 41 has a first shaft portion 55 (bolt screw) and a second shaft portion 56, as described in Figures 10 to 13.

In the striking unit 63, as shown in Figures 32 and 33, the screw shaft 58 of the bolt screw 55 is inserted into the striking tool γ from the other tube end 46B of the second cylindrical portion 46 (the second plane 43B of the striking portion 43), and the screw shaft portion 58 penetrates, in that order, the hole portion 50 of the second cylindrical portion 46, the through hole 44 of the striking portion 43, the small diameter hole portion 48 and the large diameter hole portion 47 of the first cylindrical portion 45, thereby holding one striking tool γ.
As shown in Figure 33, the Holt screw 55 is connected to the second shaft portion 56 by screwing the screw shaft portion 58 from one shaft end 56A into the screw hole 57 of the second shaft portion 56 with one threading tool γ held by the screw shaft portion 58.

In the threshing unit 63, as shown in Figures 32 and 33, the retaining shaft 41 rotates the bolt screw 55 (threaded shaft portion 58) relative to the second shaft portion 56, screwing the threaded shaft portion 58 into the screw hole 57, clamping one threshing tool γ between the head 59 of the bolt screw 55 and one shaft end 56A (one shaft end face) of the second shaft portion 56, and fixing the threshing tool γ to the retaining shaft 41.

In the scraping tool γ of the scraping unit 63, the scraping section 43 is formed in a spherical trapezoid shape with a spherical diameter da that is the same as the standard inner diameter df of the product standard of the other tube section Yb, as shown in FIG. 32.

As shown in Figures 28 and 29, the threshing unit 63 is arranged so that each threshing tool γ (axial center line j of the holding shaft 41) is concentric with the tube holding hole 41. The threshing unit 63 is arranged so that the axial center line j of the holding shaft 41 and the ball center line g of the threshing tool γ are oriented in the height direction H. The threshing unit 63 is arranged between the base 7 and the table 6 with one shaft end 41 (threshing tool γ) of the holding shaft 41 facing the table 6. The threshing unit 63 is connected to the fried frame 12 by fixing the other shaft end 4B of the holding shaft 41 (the other shaft end of the second shaft portion 56) to the slide frame 12.

In the pipe joint processing device X2, the actuator 4 is connected to the other shaft end 41B (stripping unit 63) of the retaining shaft 41 via the slide frame 12 and fixed to the base 7 (see Figures 28 to 31), as described in Figures 1 to 4 (pipe joint processing device X1 of the first embodiment).

In the pipe joint processing device X2, the actuator 4 moves (reciprocates) the scraping unit 63 (the holding shaft 41 and the scraping tool γ) in the height direction H between a first position Q1 and a second position Q2, as shown in Figures 28 to 31.
In the pipe fitting processing device X2, the second position Q2 is a position where one threading tool γ and one shaft end 41A side of the holding shaft 41 (head 59 of the bolt screw 55) are positioned in the retreat hole 32 of the mold 2, as shown in Figures 30 and 31.

In the pipe joint processing apparatus X2, the actuator 4 is a hydraulic cylinder 4 as described with reference to FIGS. 1, 2 and 4 (see FIGS. 28 and 30).
37 to 40 , the hydraulic cylinder 4 moves the slide frame 12 and the striking unit 63 in the height direction H by advancing (extending) the cylinder rod 61 from within the cylinder body 62 or retracting it into the cylinder body 62. The hydraulic cylinder 4 moves (descends) the slide frame 12 and the striking unit 63 toward the tube holding hole 31 (mold 2) by advancing (extending) the cylinder rod 61 from within the cylinder body 62, and moves (descends) the striking unit 53 (stretching tool γ) from the first position Q1 to the second position Q2.

As shown in Figures 28 to 31, the hydraulic cylinder 4 moves (raises) the slide frame 12 and the threshing unit 63 toward the base 7 by retracting the cylinder rod 61 into the cylinder body 62, and moves (raises) the threshing unit 63 from the second position Q2 to the first position Q1.

In Figures 34 to 36, the pipe joint processing device X2 performs a boring process (machining) on the inner circumferential surface f of the thick portion YC of the reducer pipe joint Y. The pipe joint processing device X2 processes the thick portion YC (the inner circumferential surface f of the thick portion YC) of the reducer pipe joint Y.

The pipe fitting processing device X2 holds the reducer pipe fitting Y in the die 2 (pipe holding hole 31) as described in Figures 1 to 3 (see Figure 29).

As shown in FIG. 29, when the pipe fitting processing device X2 holds the reducer pipe fitting Y in the mold 2, the anti-pullout members 24 of the anti-pullout devices 14, 15 protrude into the pipe holding hole 31 of the mold 2 holding the reducer pipe fitting Y, in the same manner as described in FIG. 3.

As shown in Figures 34 to 36, when the pipe fitting processing device X2 holds the reducer pipe fitting Y in the die 2, the hydraulic cylinder 4 moves (lowers) the striking unit 63 from the first position Q1 to the second position Q2.

As shown in Figures 34 and 36(a), the striking unit 63 is inserted from one shaft end 41A (head 59 of bolt screw 55) of the retaining shaft 41 into the reducer pipe fitting Y held in the mold 2 as it moves from the first position Q1 to the second position Q2. As the striking unit 63 moves from the first position Q1 to the second position Q2, it is inserted into the pipe section YA with a gap between the spherical zone ε (spherical surface) of the striking part 43 and the inner circumferential surface of the reducer pipe fitting Y (pipe section YA) held in the mold 2. As the striking part 43 of the striking tool γ moves from the first position Q1 to the second position Q2, it is inserted into the pipe section YA with a gap between the spherical zone ε (spherical surface) of the striking part 43 and the inner circumferential surface of the pipe section YA held in the mold 2. As the striking unit 63 moves from the first position Q1 to the second position Q2, it passes between the retaining members 24 of the retaining tools 14, 15 and is inserted into the pipe section YA held within the die 2.

As shown in Figures 34 and 36(a), as the striking unit 63 moves from the first position Q1 to the second position Q2, it moves (descends) from one pipe end Ya of the reducer pipe fitting Y held in the die 2 toward the other pipe end Yb (retraction hole 32) and inserts the head 59 of the bolt screw 55 into the thick-walled portion YC (inside the one pipe end Yb side) of the reducer pipe fitting Y held in the die 2, while pressing the spherical zone ε of the striking tool γ (stripping portion 43) against the inner surface f of the thick-walled portion YC.
35 and 36(a), as the reducer pipe fitting Y held in the die 2 moves from one pipe end Ya to the other pipe end Yb (retraction hole 32), the striking tool γ of the striking unit 63 presses the spherical zone ε (spherical surface) of the striking portion 43 against the inner peripheral surface f of the thick portion YC, while the striking portion 43 strikes and stretches the thick portion YC to make it thinner. The thick portion YC is stretched into the retraction hole 32 in the direction of the pipe center line a of the reducer pipe fitting Y by the striking of the striking portion 43. As shown in Figures 35 and 36(b), the scraping tool γ of the scraping unit 63 stretches and expands the diameter while scraping the thick portion YC of the reducer pipe fitting YC held in the die 2 as it moves from one pipe end Ya to the other pipe end Yb (retraction hole 32) of the reducer pipe fitting Y held in the die 2, penetrating the thick portion YC (tapered pipe portion YB) and forming the other pipe end Yb side (thick portion YC) including the other pipe end Yb to the inner diameter of the spherical diameter da (standard inner diameter df) of the scraping portion 43. As shown in Figures 35 and 36(b), the scraping tool γ (scraping portion 43) penetrates the thick portion YC (tapered pipe portion YB) and is inserted from the other pipe end YC of the reducer pipe fitting Y held in the die 2 into the retraction hole 32, and is retracted (placed) in the retraction hole 32. The thick portion YC of the reducer pipe fitting Y held in the die 2 is rolled by the rolling portion 43 of the rolling tool γ, and is expanded and enlarged into the evacuation hole 32 to have an inner diameter equal to the standard inner diameter d.

As shown in Figures 30 and 31, when the scraper γ is retracted (placed) in the retraction hole 32, the scraper unit 63 reaches the second position Q2 and places (retrieves) one scraper γ and one shaft end 41A side of the retaining shaft 42 (head 59 of the bolt screw 55) in the retraction hole 32.

In the pipe joint processing device X2, as shown in Figures 28 to 31, when the hydraulic cylinder 4 moves the striking unit 63 to the second position Q2, it retracts the cylinder rod 61 into the cylinder body 62, moves (raises) the slide frame 12 and striking unit 63 toward the base 7, and moves (raises) the striking unit 63 from the second position Q2 to the first position Q1.

As described in Figures 25 and 26, as the striking unit 63 moves from the second position Q2 to the first position Q1, it is extracted from one pipe end Ya of the reducer pipe fitting Y held in the mold 2 to the outside of the reducer pipe fitting Y.
When the scraping tool γ is removed from the reducer pipe joint Y as the scraping unit 63 moves from the second position Q2 to the first position Q2, the scraping unit 63 is moved to the first position Q1.

As shown in Figures 28 and 29, when the pipe joint processing device X2 moves the striking unit 63 from the second position Q2 to the first position Q1, it stops the retraction of the cylinder rod 61 into the cylinder body 62.

As explained in FIG. 27, when the pipe joint processing device X2 moves the striking unit 63 from the second position Q2 to the first position Q1, the retaining members 24 of the retaining tools 14, 15 move relative to the guide member 23 and retreat into the guide member 23 (guide hole 25).

When the pipe joint processing device X2 retracts the retaining members 24 of each retaining tool 14, 15 into the guide member 23, it uses the push-out tool 16 (pushing shaft 26, pushing disk 27) to extract the reducer pipe joint Y from the die 2, in the same manner as described in FIG. 27.

In this way, in the pipe fitting processing device X2, the spherical zone ε of the striator portion 43 of one striator γ is pressed against the inner surface f of the thick portion YC of the reducer pipe fitting Y (unfinished reducer pipe fitting) held in the mold 2, while the striator portion 43 penetrates the reducer pipe fitting Y held in the mold 2, so that the thick portion YC is striated by the striator portion 43, and the other pipe end Yb side (thick portion YC), including the other pipe end Yb, can be formed to the standard inner diameter df.

A pipe joint processing device and a stripping unit according to the third embodiment (the stripping unit according to the third embodiment) will be described with reference to FIGS.
37 to 48, the same reference numerals as those in FIGS. 1 to 15 denote the same members and structures, and detailed description thereof will be omitted.

37 to 42, a pipe joint processing apparatus X3 of the third embodiment includes an apparatus main body 1, a die 2 (pipe holder), and an actuator 4, similarly to that described with reference to FIGS.
The pipe joint processing apparatus X3 of the third embodiment (hereinafter referred to as the “pipe joint processing apparatus X3”) includes a threading unit 73.

The striking unit 73 is used to perform striking (machining) on the inner circumferential surface f of the thick portion YC of the reducer pipe fitting Y. The striking unit 73 is used to machine (strive) the thick portion YC of the reducer pipe fitting Y (the inner circumferential surface f of the thick portion YC).
As shown in FIGS. 41 and 42, the threshing unit 73 has two threshing tools γ (threshing portions) and a holder shaft 41 .

In the threshing unit 73, the two threshing tools γ have a threshing tool 43, a through hole 44, a first cylindrical portion 45, and a second cylindrical portion 46, as shown in Figures 7 to 9.

In the threshing unit 73, the two threshing tools γ are arranged concentrically with the holding shaft 41 and fitted onto the holding shaft 41 as shown in Figures 41 and 42. Each threshing tool γ is arranged (adjacent) in the direction of the axial center line j of the holding shaft 41 and fixed to the holding shaft 41. The two threshing tools γ are arranged (adjacent) in the order of the first threshing tool γ and the second threshing tool γ from one axial end 41A to the other axial end 41B in the direction of the axial center line j of the holding shaft 41. The two pullers γ are arranged consecutively (adjacent) in the direction of the axial center line j of the holding shaft 41 (between the axial ends 41A and 41B) of the first threshing tool γ and the second threshing tool γ.

As shown in Figures 41 and 42, the second threader γ is positioned next to the other shaft end 41B of the first threader γ in the direction of the axial center line j of the retaining shaft 41 (between the shaft ends 41A and 41B) by inserting the second cylindrical portion 46 into the large diameter hole portion 47 of the first cylindrical portion 45 of the first threader γ, abutting the other cylinder end 46B (the other cylinder end surface) of the second cylindrical portion 46 against the step portion 49 (the first cylindrical portion 45) of the first threader γ, and abutting the other flat surface 43B of the threader 43 against one cylinder end 45A (one cylinder end surface) of the first cylindrical portion 45 of the first threader γ.

In the threshing unit 73, as shown in Figures 41 and 42, the retaining shaft 41 passes through the through holes 44 of each of the threshing tools γ (threshing sections 43) in sequence, and arranges each of the threshing tools γ (threshing sections 43 of each of the threshing tools γ) adjacent (continuously) in the direction of the axial center line j of the retaining shaft 41, and holds the two threshing sections 43 between each of the axial ends 41A, 41B of the retaining shaft 41.

In the striking unit 73, the retaining shaft 41 has a first shaft portion 55 (bolt screw) and a second shaft portion 56, as described in Figures 10 to 13.

In the striking unit 73, as shown in Figures 41 and 42, the threaded shank 58 of the bolt screw 55 (first shank portion) is inserted (penetrated) into each of the striking tools γ in turn from the other tube end 46B of the second cylindrical portion 46 (the second plane 43B of the striking portion 43), and the threaded shank portion 58 penetrates, in order, the hole portion 50 of the second cylindrical portion 46 of each striking tool γ, the through hole 44 of the striking portion 43, the small diameter hole portion 48 and the large diameter hole portion 47 of the first cylindrical portion 45, and holds the N striking tools γ arranged (continuously/adjacently) in the direction of the axial center line j (axial center line j of the threaded shank portion 58).
As shown in Figures 41 and 42 , with the two threading tools γ held by the threaded shank 58, the bolt screw 55 is connected to the second shank 56 by screwing the threaded shank 58 from one shank end 56A into the threaded hole 57 of the second shank 56.

In the threshing unit 73, as shown in Figures 41 and 42, the retaining shaft 41 rotates the bolt screw 55 (threaded shaft portion 58) relative to the second shaft portion 56, screwing the threaded shaft portion 58 into the screw hole 57, clamping N threshing tools γ between the head 59 of the bolt screw 55 and one shaft end 56A (one shaft end face) of the second shaft portion 56, and fixing each threshing tool γ to the retaining shaft 41.

As shown in FIG. 42 , of the second threading tool γ held by the bolt screw 55 (threaded shank portion 58), the threaded shank portion 58 is screwed into the threaded hole 57 of the threaded tool γ (first threading tool) so that the second cylindrical portion 46 is inserted into the large diameter hole portion 47 (first cylindrical portion 45) of the adjacent threading tool γ (first threading tool) on one shaft end 41A side (rotation of the bolt screw 55), and the other tube end 46B of the second cylindrical portion 46 abuts against the step portion 49 (first cylindrical portion 45) of the adjacent threading tool γ (first threading tool) on one shaft end 41A side, and the second flat surface 43B of the threading portion 43 abuts against one tube end 45A (one tube end face) of the first cylindrical portion 45 of the adjacent threading tool γ (first threading tool) on one shaft end 41A side, so that the second threading tool γ is fixed to the holding shaft 41 adjacent (continuous) in the direction of the axial center line j of the holding shaft 41 (bolt screw 55).
The second scraper γ is positioned next to the other axial end 41B of the first scraper γ (positioned adjacent to the other axial end 41B of the first scraper γ) in the direction of the axial center line j of the retaining shaft 41 (between the axial ends 41A, 41B).

Each of the threshing tools γ is arranged in the direction of the axial center line j of the holding shaft 41, at an interval Hα (interval between threshing parts/third interval) between each of the threshing parts 43 (ball center e of each threshing part 43).

In the first threading tool γ from one shaft end 41A of the retaining shaft 41 (head 59 of the bolt screw 55), the threading portion 43 is formed into a spherical trapezoid shape with a spherical diameter dA that exceeds the pipe inner diameter dc (inner diameter) of the thick portion YC of the tapered pipe portion YB (reducer pipe fitting Y) and is less than the standard inner diameter df (target inner diameter) of the product standard of the other pipe end Yb of the reducer pipe fitting Y, as shown in Figure 41.

In the second threshing tool γ from one shaft end 41A of the retaining shaft 41, the threshing portion 43 is formed in a spherical trapezoid shape with a spherical diameter dB equal to the specified inner diameter df, as shown in FIG. 40.

As shown in Figures 37 and 38, the threshing unit 73 is arranged so that each threshing tool γ (axial center line j of the holding shaft 41) is concentric with the tube holding hole 31. The threshing unit 73 is arranged so that the axial center line j of the holding shaft 41 and the ball center line g of each threshing tool γ are oriented in the height direction H. The threshing unit 73 is arranged between the base 7 and the table 6 with one shaft end 41 of the holding shaft 41 (each threshing tool γ) facing the table 6. The threshing unit 73 is connected to the fried frame 12 by fixing the other shaft end 4B of the holding shaft 41 (the other shaft end of the second shaft portion 56) to the slide frame 12.

In the pipe joint processing device X3, the actuator 4 is connected to the other shaft end 41B (stripping unit 73) of the retaining shaft 41 via the slide frame 12, as described in Figures 1 to 4, and is fixed to the base 7 (see Figures 37 and 39).

In the pipe fitting processing device X3, the actuator 4 moves (lowers or raises) the striking unit 73 (the holding shaft 41 and each striking tool γ) and the slide frame 12 in the height direction H (the direction of the axial center line j of the holding shaft 41), as shown in Figures 37 to 40. The actuator 4 moves (reciprocates) the striking unit 73 (the holding shaft 41 and each striking tool γ) between a first position Q1 and a second position Q2 in the height direction H, as shown in Figures 37 to 40.
39 and 40, in the pipe joint processing device X2, the second position Q2 is a position where the two threading tools γ and one shaft end 41A side of the holding shaft 41 (the head 59 of the bolt screw 55) are disposed in the retreat hole 32 of the die 2. At the second position Q2, each threading tool γ is disposed (retracted) in the retreat hole 32 with a gap between it and the first threading tool γ and the die back surface 2B (extrusion disc 27).

In the pipe joint processing device X3, the actuator 4 is a hydraulic cylinder 4 as described with reference to FIGS. 1, 2 and 4 (see FIGS. 37 and 39).
37 and 39 , the hydraulic cylinder 4 moves the slide frame 12 and the striking unit 73 in the height direction H by advancing (extending) the cylinder rod 61 from within the cylinder body 62 or retracting it into the cylinder body 62. The hydraulic cylinder 4 moves (descends) the slide frame 12 and the striking unit 73 toward the tube holding hole 31 (mold 2) by advancing (extending) the cylinder rod 61 from within the cylinder body 62, and moves (descends) the striking unit 73 (each striking tool γ) from the first position Q1 to the second position Q2.

As shown in Figures 37 and 39, the hydraulic cylinder 4 moves (raises) the slide frame 12 and the threshing unit 73 toward the base 7 by retracting the cylinder rod 61 into the cylinder body 62, and moves (raises) the threshing unit 73 from the second position Q2 to the first position Q1.

In Figures 43 to 48, the pipe joint processing device X3 performs a boring process (machining) on the inner circumferential surface f of the thick portion YC of the reducer pipe joint Y. The pipe joint processing device X3 processes the thick portion YC (the inner circumferential surface f of the thick portion YC) of the reducer pipe joint Y.

The pipe fitting processing device X3 holds the reducer pipe fitting Y in the die 2 (pipe holding hole 31) as described in Figures 1 to 3 (see Figure 38).

As shown in FIG. 38, when the pipe fitting processing device X3 holds the reducer pipe fitting Y in the mold 2, the anti-pullout members 24 of each of the anti-pullout devices 14, 15 protrude into the pipe holding hole 31 of the mold 2 holding the reducer pipe fitting Y, in the same manner as described in FIG. 3.

As shown in Figures 37 to 40, when the pipe fitting processing device X3 holds the reducer pipe fitting Y in the die 2, the hydraulic cylinder 4 moves (lowers) the striking unit 63 from the first position Q1 to the second position Q2.

As shown in Figures 43 to 45, the sieving unit 73 is inserted from one shaft end 41A (head 59 of bolt screw 55) of the retaining shaft 41 into the reducer pipe fitting Y held in the mold 2 as it moves from the first position Q1 to the second position Q2. As the sieving unit 73 moves from the first position Q1 to the second position Q2, it is inserted into the pipe section YA with a gap between the spherical zone ε (spherical surface) of each sieving part 43 and the inner peripheral surface of the reducer pipe fitting Y (pipe section YA) held in the mold ... part 43 of each sieving tool γ moves from the first position Q1 to the second position Q2, it is inserted into the pipe section YA with a gap between the spherical zone ε of each sieving part 43 and the inner peripheral surface of the pipe section YA held in the mold 2. As the striking unit 73 moves from the first position Q1 to the second position Q2, it passes between the retaining members 24 of the retaining tools 14, 15 and is inserted into the pipe section YA held by the die 2.

As shown in Figures 43 and 45(a), as the striking unit 73 moves from the first position Q1 to the second position Q2, it moves (descends) within the reducer pipe fitting Y held in the mold 2 from one pipe end Ya to the other pipe end Yb (retreat hole 32), and while inserting one shaft end 41A side (head 59 of the bolt screw 55) of the holding shaft 41 into the thick-walled portion YC (inside the one pipe end Yb side) of the reducer pipe fitting Y held in the mold 2, the spherical zone ε of the first striking tool γ (stripping portion 43) is pressed against the inner surface f of the thick-walled portion YC.
As explained in Figures 16 to 18 (the pipe fitting processing apparatus X1 of the first embodiment), the first scraping tool γ (scraping portion 43) scrapes the thick portion YC of the reducer pipe fitting Y held in the die 2, stretches and expands in diameter as the reducer pipe fitting Y held in the die 2 moves from one pipe end Ya to the other pipe end Yb (retreat hole 32), penetrating the thick portion YC (tapered pipe portion YB) and forming the thick portion YC to the inner diameter of the spherical diameter d1 of the first scraping portion 43 [see Figures 43 and 45 (b)].

As shown in Figures 46 and 48(a), when the reducer pipe fitting Y held in the die 2 moves from one pipe end Ya to the other pipe end Yb (retraction hole 32), the first scraping tool γ (scraping portion 43 and one shaft end 41A side of the holding shaft 41 are inserted (retracted) into the retraction hole 32, and the spherical zone ε of the second scraping tool γ (scraping portion 43) is pressed against the inner surface f of the thick-wall portion YC.
As the second striking tool γ moves from one pipe end Ya of the reducer pipe fitting Y held in the die 2 to the other pipe end Yb (retraction hole 32), as shown in Figures 47 and 48(b), it presses the spherical zone ε (spherical surface) of the striking part 43 against the inner circumferential surface f of the thick portion YC, while striking and stretching the thick portion YC with the striking part 43 to make it thinner. The thick portion YC is stretched into the retraction hole 32 in the direction of the pipe center line a of the reducer pipe fitting Y (the cylindrical center line s of the die 2) by the striking of the second striking part 43. As shown in Figures 47 and 48(b), the second threading tool γ (threading section 43) moves from one pipe end Ya of the reducer pipe fitting Y held in the die 2 to the other pipe end Yb (retraction hole 32), stretches and expands the diameter while threading the thick portion YC of the reducer pipe fitting Y held in the die 2, penetrating the thick portion YC (tapered pipe section YB) and shaping the other pipe end Yb side (thick portion YC) including the other pipe end Yb to the inner diameter of the spherical diameter dB (standard inner diameter df) of the second threading section 43. As shown in Figures 47 and 48(b), the second threading tool γ (threading section 43) penetrates the thick portion YC (tapered pipe section YB) and is inserted from the other pipe end Yb of the reducer pipe fitting Y held in the die 2 into the retraction hole 32, and is retracted (placed) in the retraction hole 32. The thick portion YC of the reducer fitting Y held in the mold 2 is handled by the second handling portion 43 (handling tool γ), and is extended and enlarged into the retreat hole 32, so as to be formed to an inner diameter equal to the standard inner diameter df [see Figures 47 and 48 (b)].

As shown in Figures 37 and 38, when the scraping unit 73 retracts (places) each scraping tool γ in the retraction hole 32, it reaches the second position Q2 and places (retrieves) the two scraping tools γ and one shaft end 41A side of the retaining shaft 42 (head 59 of the bolt screw 55) in the retraction hole 32.

In the pipe joint processing device X3, as shown in Figures 37 to 40, when the hydraulic cylinder 4 moves the striking unit 73 to the second position Q2, it retracts the cylinder rod 61 into the cylinder body 62, moves (raises) the slide frame 12 and striking unit 73 toward the base 7, and moves (raises) the striking unit 73 from the second position Q2 to the first position Q1.

As described in Figures 25 and 26, as the striking unit 73 moves from the second position Q2 to the first position Q1, it is extracted from one pipe end Ya of the reducer pipe fitting Y held in the mold 2 to the outside of the reducer pipe fitting Y.
When the threshing unit 73 moves from the second position Q2 to the first position Q2 and the threshing tools γ are removed from the reducer pipe joints Y, the threshing unit 73 is moved to the first position Q1.

When the pipe joint processing device X3 moves the striking unit 73 from the second position Q2 to the first position Q1, it stops the retraction of the cylinder rod 61 into the cylinder body 62.

When the pipe joint processing device X3 moves the scraping unit 73 from the second position Q2 to the first position Q1, the stopper members 24 of each stopper tool 14, 15 move relative to the guide member 23 and retreat into the guide member 23 (guide hole 25).

As shown in Figures 37 and 38, the pipe joint processing device X3 retracts the retaining members 24 of each retaining tool 14, 15 into the guide member 23, and then, in the same manner as described in Figure 27, uses the pushing tool 16 (pushing shaft 26, pushing disk 27) to push the reducer pipe joint Y out of the die 2.

In this way, in the pipe fitting processing device X3, the two scraping tools γ, starting from the first scraping tool γ, are pressed against the inner surface f of the thick portion YC of the reducer pipe fitting Y (unfinished reducer pipe fitting) held in the mold 2 by pressing the spherical zone ε of each scraping portion 43 against the inner surface f of the thick portion YC of the reducer pipe fitting Y (unfinished reducer pipe fitting) held in the mold 2, while penetrating the reducer pipe fitting Y held in the mold 2, so that the thick portion YC is scraped by each scraping portion 43, and the other pipe end Yb side (thick portion YC) including the other pipe end Yb can be formed to the standard inner diameter df.
In the pipe fitting processing device X3, the two scraping tools γ, starting from the first scraping tool γ, scrape the thick portion YC of the reducer pipe fitting Y (unfinished reducer pipe fitting) held in the die 2, thereby gradually expanding the inner diameter of the thick portion YC and forming the inner diameter on the other pipe end Yb side, including the other pipe end Yb, to the standard inner diameter.This makes it possible to form the inner diameter on the other pipe end Yb side, including the other pipe end Yb, of the reducer pipe fitting Y held in the die 2 to the standard inner diameter without damaging the other pipe end Yb side of the tapered pipe portion YB.

The method of manufacturing the pipe joint will be described with reference to FIGS.
A method of processing the pipe joints of the first to third embodiments will be described with reference to FIGS.

A method of machining the pipe joint of the first embodiment will be described with reference to FIGS.
50 to 62, the same reference numerals as those in FIGS. 1 to 15 denote the same members and structures, and detailed description thereof will be omitted.

The first embodiment of the pipe fitting processing method includes a reducer pipe fitting Y, a die 2, and a cutting unit 3 (see FIG. 50), as described in FIG. 1 to FIG. 15 (pipe fitting processing device X).

In the first embodiment of the pipe fitting processing method, the die 2 is fixed to the mounting surface GL by abutting the rear surface 2B of the die against the mounting surface GL, as shown in FIG. 50.

In the processing method for a pipe joint according to the first embodiment, the striking unit 3 has N striking tools γ and a holder shaft 41 (first and second shaft portions 55, 56) as shown in Figs.
As shown in FIGS. 14 and 15, the threshing unit 3 has, for example, three threshing tools γ and a holder shaft 41 (see FIG. 50).
50 , the striking unit 3 is arranged with each striking tool γ concentric with the tube holding hole 31 of the die 2. The striking unit 3 is arranged so that the axial center line j of the holder shaft 41 and the spherical center line g of each striking tool γ face the direction H (height direction) of the cylindrical center line s of the die 2. The striking unit 3 is arranged so that one shaft end 41A of the holder shaft 41 (the first striking tool γ) faces the die surface 2A.
As shown in FIG. 50, the striking unit 3 is disposed in a first position Q1 in the height direction H with a distance Hε between one shaft end 41A of the holder shaft 41 and the die surface 2A.

The processing method for the pipe fitting of the first embodiment includes a pipe holding step S1, a striking step S2, a pipe extracting step S3, and a cutting step S4, as shown in Figure 49. The processing method for the pipe fitting is performed in the order of the pipe holding step S1, the striking step S2, the pipe extracting step S3, and the cutting step S4.
The pipe fitting is processed by applying a machining process to the inner peripheral surface f of the thick portion YC of the reducer pipe fitting Y, and forming the other pipe end Yb side including the other pipe end Yb of the reducer pipe fitting Y to the standard inner diameter df.

In the method for processing a pipe fitting according to the first embodiment, the pipe holding step S1 holds a reducer pipe fitting Y in a die 2, as shown in FIG.
In the pipe holding process S1, as shown in FIG. 50 , the reducer pipe fitting Y is inserted into the pipe holding hole 31 of the mold 2 from the other pipe end Yb, and the outer peripheral surface α of the pipe section YA and the outer peripheral surface β of the tapered pipe section YB are abutted against the pipe holding hole 31 (the inner peripheral surface of the pipe holding hole 31) to hold the reducer pipe fitting Y in the mold 2.
In the pipe holding step S1, the reducer pipe fitting Y is inserted into the pipe holding hole 31 of the die 2 from the other pipe end Yb as shown in Fig. 50. The reducer pipe fitting Y is arranged in the pipe holding hole 31 from the die surface 2A. As the reducer pipe fitting Y is inserted into the pipe holding hole 31, the outer peripheral surface β of the tapered pipe section YC and the outer peripheral surface α of the pipe section YA abut against the pipe holding hole 31 (the inner peripheral surface of the pipe holding hole 31) and are held in the die 2. The pipe section YA is held in the die 2 with the outer peripheral surface α of the pipe section YA abutting against the first hole section 33 (the inner peripheral surface of the first hole section 33). The tapered pipe section YB is held in the die 2 so as to be freely removable with the outer peripheral surface β of the tapered pipe section YB abutting against the second hole section 34 (the inner peripheral surface of the second hole section 34).
As shown in Figure 50, the reducer pipe fitting Y is positioned concentrically with the pipe holding hole 31 and held in the mold 2 by abutting the outer surface α of the pipe section YA and the outer surface β of the tapered pipe section YB against the pipe holding hole 31 (the inner surface of the pipe holding hole 31).

In the processing method for the pipe fitting of the first embodiment, the striking process S2 is performed following the pipe holding process S1. In the striking process S2, as shown in Figures 51 to 59, striking is performed on the inner peripheral surface f of the thick portion YC of the reducer pipe fitting Y (unfinished reducer pipe fitting Y).
As shown in Figures 51 to 59, in the scraping process S2, the scraping unit 3 is moved (descended) from the first position Q1 toward the retreat hole 32 (the back surface 2B of the mold), and three (N) scraping tools γ are passed through the tube section YA and tapered tube section YB held in the mold 2, starting with the first scraping tool γ, in that order, and each scraping tool γ and one shaft end 41A side of the holding shaft 41 (head 59 of the bolt screw 55) are inserted (retreated) into the retreat hole 32.

In the sifting step S2, as shown in Figures 51 to 59, the three (N) sifting tools γ are moved in sequence from the first sifting part 43 toward the retreat hole 32 (mold back surface 2B) as the sifting unit 3 moves, pressing the spherical zone ε (spherical surface) of the three (N) sifting parts 43 against the inner circumferential surface f of the thick part YC of the reducer pipe fitting Y held in the mold 2, and the thick part YC is sifted by each sifting part 43 with the spherical zone ε pressed against the thick part YC, stretching it into the retreat hole 32 and thinning it, thereby forming the other pipe end Yb side, including the other pipe end Yb of the tapered pipe part YB, to the standard inner diameter df.

In the punching process S2, as shown in Figures 51 and 53 (a), as the punching unit 3 moves from the first position Q1 to the retreat hole 32, one axial end 41A of the holding shaft 41 is inserted into the thick portion YC of the reducer pipe fitting Y held in the mold 2, while pressing the spherical zone ε of the first punching tool γ (punching portion 43) against the inner surface f of the thick portion YC.
16 to 18 (the pipe fitting processing device X1 of the first embodiment), the first striking tool γ (stripping section 43) stretches and expands in diameter while striking the thick portion YC of the reducer pipe fitting Y held in the die 2 as the striking unit 3 moves, penetrating the thick portion YC (tapered pipe portion YB) and forming the thick portion YC into the inner diameter of the spherical diameter d1 of the first striking section 43 [see FIGS. 52 and 53(b)]. The first striking tool γ (stripping section 43) and one shaft end 41A of the holder shaft 41, as shown in FIGS. 52 and 53(b), penetrate the thick portion YC (tapered pipe portion YB) and are inserted into the retreat hole 32 from the other pipe end Yb of the reducer pipe fitting Y held in the die 2, and are retreated (disposed) in the retreat hole 32.

In the scraping process S2, as shown in Figures 54 and 56 (a), as the scraping unit 3 moves from the first position Q1 to the retraction hole 32, the first scraping tool γ and one shaft end 41A of the holding shaft 41 are inserted into the retraction hole 32, and the spherical zone ε of the second scraping tool γ (scraping portion 43) is pressed against the inner surface f of the thick portion YC.
19 to 21 (the pipe fitting processing device X1 of the first embodiment), as the striking unit 3 moves, the spherical zone ε of the striking unit 43 stretches and expands in diameter while striking the thick portion YC of the reducer pipe fitting Y held in the die 2, penetrating the thick portion YC (tapered pipe portion YB) and forming the thick portion YC into the inner diameter of the spherical diameter d2 of the second striking unit 43 [see FIGS. 55 and 56(b)]. As shown in FIGS. 55 and 56(b), the second striking tool γ (stripping unit 43) penetrates the thick portion YC (tapered pipe portion YB) and is inserted into the retreat hole 32 from the other pipe end Yb of the reducer pipe fitting Y held in the die 2, and is retreated (disposed) in the retreat hole 32.

In the scraping process S2, as shown in Figures 57 and 59 (a), as the scraping unit 3 moves from the first position Q1 to the retraction hole 32, the second scraping tool γ is inserted into the retraction hole 32, and the spherical zone ε of the third (Nth) scraping tool γ (scraping portion 43) is pressed against the inner surface f of the thick portion YC.
As explained in Figures 22 to 24 (the pipe fitting processing apparatus X1 of the first embodiment), as the striking unit 3 moves, the third (Nth) striking tool γ (stripping section 43) strikes the thick portion YC of the reducer pipe fitting Y held in the mold 2, stretches and expands in diameter, penetrating the thick portion YC (tapered pipe section YB) and forming the other pipe end Yb side (thick portion YC) including the other pipe end Yb to the inner diameter of the spherical diameter d3 (standard inner diameter df) of the third (Nth) striking section 43 [see Figures 58 and 59 (b)]. As shown in Figures 58 and 59 (b), the third (Nth) scraping tool γ (scraping portion 43) penetrates the thick-walled portion YC (tapered tube portion YB) and is inserted into the evacuation hole 32 from the other tube end Yb of the reducer tube fitting Y held in the mold 2, and is retracted (placed) in the evacuation hole 32.

In the scraping process S2, the scraping unit 3 inserts (retreats) three (N) scrapers γ and one shaft end 41A of the holding shaft 41 into the retraction hole 32 as shown in FIG. 58.

In the method for processing the pipe fitting of the first embodiment, the pipe removal step S3 is performed following the striking step S2. In the pipe removal step S3, the reducer pipe fitting Y is removed from the die 2 (the pipe holding hole 31).
In the tube removal process S3, as shown in FIG. 39, the striking unit 3 is moved toward the first position Q1, and the three (N) striking tools γ (stripping portions 43) and the holding shaft 41 are removed from the reducer fitting tube Y, and the reducer fitting tube Y is removed from the mold 2 (tube holding hole 31).

In the processing method for the pipe fitting of the first embodiment, the cutting step S4 is performed following the pipe removal step S3, as shown in Fig. 61. In the cutting step S4, each pipe end Ya, Yb of the reducer pipe fitting pipe Y is cut by cutting to form the pipe length LX (the distance from the pipe end Ya (pipe end face) to the pipe end Yb (pipe end face)) of the product standard (finished product standard).
The product standard pipe length LX is the "distance from end face to end face" defined in "JIS B 2313:2015" of the Japanese Industrial Standards (JIS standards).
As shown in FIG. 61, the cutting process S4 involves cutting the pipe section YA continuing from the pipe end Ya of the reducer pipe fitting Y to form an outer circumferential chamfered portion 61 on the outer circumferential surface α of the pipe section YA, and cutting the tapered pipe section YB continuing from the pipe end Yb of the reducer pipe fitting Y to form an outer circumferential chamfered portion 62 on the outer circumferential surface β of the tapered pipe section YB.
In the cutting process S4, each pipe end Ya, Yb of the reducer pipe fitting Y, the pipe section YA continuing to each pipe end Ya, and the tapered pipe section YC continuing to the pipe end Yb are cut (cutting process) to form a reducer pipe fitting YX having the product standard pipe length L and each outer peripheral chamfered section 61, 62.
In the cutting process S2, the thick portion YC of the reducer pipe fitting Y is stretched and the other pipe end Yb side, including the other pipe end Yb, is formed to the standard inner diameter df. Therefore, in the cutting process S4, each pipe end Ya, Y portion of the reducer pipe fitting Y is cut to form the product pipe length LX.

The reducer pipe fitting YX of the product (finished reducer pipe fitting YX) is connected (coupled) to the metal pipes Z1 and Z2 by welding, as shown in FIG.
The metal pipes V and W are, for example, carbon steel pipes. The metal pipe V is formed into a cylindrical shape with the same outer diameter as the pipe outer diameter DP of the pipe section YA of the reducer pipe joint YX, and has outer peripheral chamfered portions VA and VB on the pipe outer peripheral surface continuing to each pipe end Va and Vb of the metal pipe W. The metal pipe W is formed into a cylindrical shape with the same outer diameter as the pipe outer diameter of the other pipe end Yb of the tapered pipe section YB of the reducer pipe joint YX, and has outer peripheral chamfered portions WA and WB on the pipe outer peripheral surface continuing to each pipe end Wa and Wb of the metal pipe W.
In FIG. 41, the reducer fitting YX of the product is arranged so that one pipe end Ya is abutted against one pipe end Va of a metal pipe V and the other pipe end Yb is abutted against one pipe end Wa of a metal pipe W.
When the reducer fitting YX and the metal pipe V are butted together, a groove K1 is formed between the outer peripheral chamfered portion 61 of the reducer fitting YX and the outer peripheral chamfered portion VA of the metal pipe V. When the reducer fitting YX and the metal pipe W are butted together, a groove K2 is formed between the outer peripheral chamfered portion 62 of the reducer fitting Y and the outer peripheral chamfered portion WA of the metal pipe W.
The reducer pipe fitting YX and each metal pipe W, V are butted together and then welded along each groove K1, K2 to connect (connect) the reducer pipe fitting YX (the product reducer pipe fitting) to each metal pipe W, V.

In this way, in the processing method for the pipe fitting of the first embodiment, N (three) scraping tools γ, starting from the first scraping tool γ, are pressed against the inner surface f of the thick portion YC of the reducer pipe fitting Y held in the mold 2, while each scraping portion 43 penetrates the reducer pipe fitting Y held in the mold 2, so that the thick portion YC is scraped by each scraping portion 43, and the other pipe end Yb side (thick portion YC), including the other pipe end Yb, can be formed to the standard inner diameter df.
In the processing method for the pipe fitting of the first embodiment, N (or three) scrapers γ, starting from the first scraper γ, are used to scrape the thick portion YC of the reducer pipe fitting Y held in the die 2, thereby gradually (gradually) expanding the inner diameter of the thick portion YC and forming the inner diameter on the other pipe end Yb side, including the other pipe end Yb, to the standard inner diameter.This makes it possible to form the inner diameter on the other pipe end Yb side, including the other pipe end Yb, of the reducer pipe fitting Y held in the die 2 to the standard inner diameter without damaging the other pipe end Yb side of the tapered pipe portion YB.

A method of machining the pipe joint of the second embodiment will be described with reference to FIGS.
63 to 66, the same reference numerals as those in FIGS. 1 to 15, 32 and 33 indicate the same members and configurations, and therefore detailed explanations thereof will be omitted.

The processing method for the pipe fitting of the second embodiment is similar to that described in Figures 1 to 15, 32 and 33, and includes a reducer fitting pipe Y, a die 2 and a scraping unit 63 (see Figure 63).

In the second embodiment of the pipe fitting processing method, the die 2 is fixed to the mounting surface GL by abutting the rear surface 2B of the die against the mounting surface GL, as shown in FIG. 63.

In the processing method for a pipe joint of the second embodiment, the striking unit 63 has one striking tool γ and a holder shaft 41 (first and second shaft portions 55, 56) as shown in Figs.
63, the striking unit 63 is disposed with the striking tool γ concentric with the tube holding hole 31 of the die 2. The striking unit 63 is disposed with the axial center line j of the holder shaft 41 and the spherical center line g of the striking tool γ oriented in the direction H (height direction) of the cylindrical center line s of the die 2. The striking unit 63 is disposed with one axial end 41A of the holder shaft 41 oriented toward the die surface 2A.
As shown in FIG. 63, the striking unit 63 is disposed in a first position Q1 in the height direction H with a distance Hε between one shaft end 41A of the holder shaft 41 and the die surface 2A.
One shaft end 41A of the holder shaft 41 is disposed in the height direction H with a distance Hε between it and the mold surface 2A.

The processing method for a pipe fitting of the second embodiment includes a pipe holding step S1, a striking step S2, a pipe removal step S3, and a cutting step S4, as shown in Figure 49. The processing method for a pipe fitting of the second embodiment is performed in the order of the pipe holding step S1, the striking step S2, the pipe removal step S3, and the cutting step S4.
The processing method for the pipe fitting of the second embodiment involves applying a milling process to the inner surface f of the thick portion YC of the reducer pipe fitting Y to form the other pipe end Yb side, including the other pipe end Yb of the reducer pipe fitting Y, to the standard inner diameter df.

In the second embodiment of the pipe fitting processing method, the pipe holding step S1 holds the reducer pipe fitting Y in the mold 2 (see FIG. 63), similar to the process described in FIG. 50 (the first embodiment of the pipe fitting processing method).

In the processing method for a pipe joint according to the second embodiment, the striking step S2 is carried out following the pipe holding step S1.
In the processing method for a pipe fitting of the second embodiment, the striking step S2, as shown in Figures 64 to 66, involves moving (descending) the striking unit 63 from the first position Q1 toward the retreat hole 32 (the back surface 2B of the mold), and passing one striking tool γ through the pipe section YA and the tapered pipe section YB held in the mold 2, in that order, and inserting (retrieving) the striking tool γ and one of the shaft ends 41A of the holding shaft 41 (the head 59 of the bolt screw 55) into the retreat hole 32.

In the threshing process S2, one threshing tool γ is moved toward the retreat hole 32 (mold back surface 2B) as the threshing unit 63 moves, while pressing the spherical zone ε (spherical surface) of the threshing portion 43 against the inner surface f of the thick portion YC of the reducer pipe fitting Y held in the mold 2, and the threshing portion 43 with the spherical zone ε pressed against the thick portion YC handles the thick portion YC, stretching it into the retreat hole 32 and thinning it, thereby forming the other pipe end Yb side, including the other pipe end Yb of the tapered pipe portion YB, to the standard inner diameter df.

In the striking process S2, as shown in Figures 64 and 66 (a), as the striking unit 63 moves from the first position Q1 to the retreat hole 32, it inserts one axial end 41A of the retaining shaft 41 into the thick portion YC of the reducer pipe fitting Y held in the mold 2, while pressing the spherical zone ε of the striking tool γ (stripping portion 43) against the inner surface f of the thick portion YC.
As explained in Fig. 34 to Fig. 36 (the pipe fitting processing device X2 of the second embodiment), as shown in Fig. 64 to Fig. 66, the striking tool γ (stripping section 43) stretches and expands the diameter while striking the thick portion YC of the reducer pipe fitting Y held in the die 2 as the striking unit 63 moves, penetrating the thick portion YC (tapered pipe portion YB) and forming the thick portion YC into the inner diameter of the spherical diameter dA (standard inner diameter df) of the striking section 43 [Fig. 65 and Fig. 66(b)]. As shown in Fig. 65 and Fig. 66(b), the striking tool γ (stripping section 43) and one shaft end 41A of the holder shaft 41 penetrate the thick portion YC (tapered pipe portion YB) and are inserted into the retreat hole 32 from the other pipe end Yb of the reducer pipe fitting Y held in the die 2, and are retreated (disposed) in the retreat hole 32.

In the scraping step S2, the scraping unit 3 is positioned (retracted) by inserting one scraping tool γ and one shaft end 41A of the holding shaft 41 into the retraction hole 32, as shown in Figures 65 and 66 (b).

In the method for processing a pipe fitting according to the second embodiment, the pipe removal step S3 is performed following the striking step S2. In the pipe removal step S3, the reducer pipe fitting Y is removed from the die 2 (the pipe holding hole 31).
In the processing method for the pipe fitting of the second embodiment, the pipe removal process S3, as described in Figure 60 (the processing method for the pipe fitting of the first embodiment), involves moving the striking unit 3 toward the first position Q1, removing one striking tool γ (striking portion 43) and the holding shaft 41 from the reducer pipe fitting Y, and removing the reducer fitting pipe Y from the mold 2 (pipe holding hole 31).

In the method for processing a pipe joint according to the second embodiment, the cutting step S4 is carried out following the pipe extraction step S3.
In the processing method for the pipe fitting of the second embodiment, the cutting process S4, as explained in Figure 61 (the processing method for the pipe fitting of the first embodiment), involves cutting each pipe end Ya, Yb of the reducer pipe fitting pipe Y by cutting to form it to the pipe length LX (the distance from the pipe end Ya (pipe end face) to the pipe end Yb (pipe end face)) of the product standard (finished product standard).

In this way, in the processing method for the pipe fitting of the second embodiment, the spherical zone ε of the threshing portion 43 of one threshing tool γ is pressed against the inner surface f of the thick portion YC of the reducer pipe fitting Y held in the die 2, while the threshing portion 43 penetrates the reducer pipe fitting Y held in the die 2, so that the thick portion YC is handled by the threshing portion 43, and the other pipe end Yb side (thick portion YC) including the other pipe end Yb can be formed to the standard inner diameter df.

A method of machining the pipe joint of the third embodiment will be described with reference to FIGS.
67 to 73, the same reference numerals as those in FIGS. 1 to 15, 42 and 43 indicate the same members and configurations, and therefore detailed explanations thereof will be omitted.

The processing method for the pipe fitting of the third embodiment is similar to that described in Figures 1 to 15, 42 and 43, and includes a reducer fitting pipe Y, a die 2 and a scraping unit 73 (see Figure 67).

In the third embodiment of the pipe fitting processing method, the die 2 is fixed to the mounting surface GL by abutting the rear surface 2B of the die against the mounting surface GL, as shown in FIG. 67.

In the processing method for a pipe joint of the third embodiment, the scraping unit 73 has two scraping tools γ and a holder shaft 41 (first and second shaft portions 55, 56) as shown in FIGS.
67 , the striking unit 73 is arranged with each striking tool γ concentric with the tube holding hole 31 of the mold 2. The striking unit 73 is arranged so that the axial center line j of the holder shaft 41 and the spherical center line g of each striking tool γ are oriented in the direction H (height direction) of the cylindrical center line s of the mold 2. The striking unit 73 is arranged so that one shaft end 41A of the holder shaft 41 (the first striking tool γ) is oriented toward the mold surface 2A.
As shown in FIG. 67, the striking unit 73 is disposed in a first position Q1 in the height direction H with a distance Hε between one shaft end 41A of the holder shaft 41 and the die surface 2A.
One shaft end 41A of the holder shaft 41 is disposed in the height direction H with a distance Hε between it and the mold surface 2A.

The processing method for a pipe fitting of the third embodiment includes a pipe holding step S1, a striking step S2, a pipe removal step S3, and a cutting step S4, as shown in Figure 49. The processing method for a pipe fitting of the third embodiment is performed in the order of the pipe holding step S1, the striking step S2, the pipe removal step S3, and the cutting step S4.
The processing method for the pipe fitting of the third embodiment involves applying a milling process to the inner surface f of the thick portion YC of the reducer pipe fitting Y to form the other pipe end Yb side, including the other pipe end Yb of the reducer pipe fitting Y, to the standard inner diameter df.

In the processing method for the pipe fitting of the third embodiment, the pipe holding step S1 holds the reducer pipe fitting Y in the mold 2 (see FIG. 67), similar to the process described in FIG. 50 (processing method for the pipe fitting of the first embodiment).

In the processing method for the pipe fitting of the third embodiment, the striking step S2, as shown in FIG. 68, moves (lowers) the striking unit 73 from the first position Q1 toward the retreat hole 32 (the back surface 2B of the mold), and passes the two striking tools γ, starting with the first striking tool γ, through the pipe section YA and the tapered pipe section YB held in the mold 2 in that order, and inserts (retreats) each striking tool γ and one shaft end 41A side of the retaining shaft 41 (the head 59 of the bolt screw 55) into the retreat hole 32.

In the sifting step S2, as shown in Figures 68 to 70, the two sifting tools γ are moved in the order of the first sifting part 43 and the second sifting part 43 in conjunction with the movement of the sifting unit 3, while pressing the spherical zone ε (spherical surface) of the two sifting parts 43 against the inner circumferential surface f of the thick portion YC of the reducer pipe fitting Y held in the mold 2, toward the retreat hole 32 (mold back surface 2B). Each sifting part 43 with the spherical zone ε pressed against the thick portion YC sifting the thick portion YC and extending it into the retreat hole 32 to thin it, thereby forming the other pipe end Yb side including the other pipe end Yb of the tapered pipe portion YB to the standard inner diameter df.

In the punching process S2, as shown in Figures 68 and 70 (a), as the punching unit 73 moves from the first position Q1 to the retreat hole 32, one axial end 41A of the retaining shaft 41 is inserted into the thick portion YC of the reducer pipe fitting Y held in the mold 2, while pressing the spherical zone ε of the first punching tool γ (punching portion 43) against the inner surface f of the thick portion YC.
16 to 18 (the pipe fitting processing device X1 of the first embodiment), as the striking unit 3 moves, the first striking tool γ (stripping section 43) strikes the thick portion YC of the reducer pipe fitting Y held in the die 2, stretches and expands in diameter, and penetrates the thick portion YC (tapered pipe portion YB) to form the thick portion YC into the inner diameter of the spherical diameter d1 of the first striking section 43 [see Figs. 69 and 70(b)]. As shown in Figs. 69 and 70(b), the first striking tool γ (stripping section 43) and one shaft end 41A of the holder shaft 41 penetrate the thick portion YC (tapered pipe portion YB) and are inserted into the retreat hole 32 from the other pipe end Yb of the reducer pipe fitting Y held in the die 2, and are retreated (disposed) in the retreat hole 32.

In the scraping process S2, as shown in Figures 71 and 73(a), as the scraping unit 73 moves from the first position Q1 to the retraction hole 32, the first scraping tool γ is inserted into the retraction hole 32, and the spherical zone ε of the second scraping tool γ (scraping portion 43) is pressed against the inner surface f of the thick portion YC.
46 to 48 (the pipe fitting processing device X3 of the third embodiment), the second threading tool γ (threading section 43) stretches and expands in diameter while threading the thick portion YC of the reducer pipe fitting Y held in the die 2 as the threading unit 3 moves, penetrating the thick portion YC (tapered pipe section YB) and forming the other pipe end Yb side (thick portion YC) including the other pipe end Yb to the inner diameter of the spherical diameter d3 (standard inner diameter df) of the second threading section 43 [see Figs. 72 and 73(b)]. As shown in Figs. 72 and 73(b), the second threading tool γ (threading section 43) penetrates the thick portion YC (tapered pipe section YB) and is inserted into the retreat hole 32 from the other pipe end Yb of the reducer pipe fitting Y held in the die 2, and is retreated (disposed) in the retreat hole 32.

In the scraping step S2, the scraping unit 73 is positioned (retracted) by inserting the two scrapers γ and one shaft end 41A of the holding shaft 41 into the retraction hole 32, as shown in Figures 72 and 73(b).

In the method for processing a pipe fitting according to the third embodiment, the pipe removal step S3 is performed following the striking step S2. In the pipe removal step S3, the reducer pipe fitting Y is removed from the die 2 (the pipe holding hole 31).
In the processing method for the pipe fitting of the third embodiment, the pipe removal process S3, as described in Figure 60 (the processing method for the pipe fitting of the first embodiment), involves moving the striking unit 3 toward the first position Q1, removing the two striking tools γ (striking portions 43) and the holding shaft 41 from the reducer pipe fitting Y, and removing the reducer fitting pipe Y from the mold 2 (pipe holding hole 31).

In the method for processing a pipe joint according to the third embodiment, the cutting step S4 is carried out following the pipe extraction step S3.
In the processing method for the pipe fitting of the third embodiment, the cutting process S4, as explained in Figure 61 (the processing method for the pipe fitting of the first embodiment), involves cutting each pipe end Ya, Yb of the reducer pipe fitting pipe Y by cutting to form it to the pipe length LX (the distance from the pipe end Ya (pipe end face) to the pipe end Yb (pipe end face)) of the product standard (finished product standard).

In this way, in the processing method of the pipe fitting of the third embodiment, the two scraping tools γ, starting from the first scraping tool γ, are pressed against the inner surface f of the thick portion YC of the reducer pipe fitting Y held in the mold 2 while each scraping portion 43 penetrates the reducer pipe fitting Y held in the mold 2, so that the thick portion YC is handled by each scraping portion 43, and the other pipe end Yb side (thick portion YC) including the other pipe end Yb can be formed to the standard inner diameter df.
In the processing method of the pipe fitting of the third embodiment, the two scrapers γ, starting from the first scraper γ, scrape the thick portion YC of the reducer pipe fitting Y held in the die 2, thereby gradually expanding the inner diameter of the thick portion YC and forming the inner diameter on the other pipe end Yb side, including the other pipe end Yb, to the standard inner diameter.This makes it possible to form the inner diameter on the other pipe end Yb side, including the other pipe end Yb, of the reducer pipe fitting Y held in the die 2 to the standard inner diameter without damaging the other pipe end Yb side of the tapered pipe section YB.

In the pipe fitting processing devices X1, X2, and X3 of the first to third embodiments and the pipe fitting processing methods of the first to third embodiments, the thick-walled portion YC of the reducer pipe fitting Y held in the mold 2 is processed by the processing portion 43 to extend it in the direction of the pipe center line a, thereby forming the reducer pipe fitting Y into a pipe length that exceeds the pipe length LX of the product standard, and then the reducer pipe fitting Y can be formed into the pipe length LX of the product standard by cutting. In this way, by forming the reducer pipe fitting Y into a pipe length that exceeds the pipe length of the product standard, it is possible to increase the number (yield) of reducer pipe fittings that can be manufactured from the metal pipe P per unit length.

This invention is ideal for machining reducer pipe fittings (unfinished reducer pipe fittings).

X1 Pipe joint processing device Y Reducer pipe joint YC Thick wall portion 1 Device body 3 Squeezing unit 32 Retraction hole 43 Squeezing part

Claims (9)

A reducer pipe fitting includes a pipe section at one pipe end side of a metal pipe, and a tapered pipe section whose diameter is gradually reduced from the pipe section toward the other pipe end of the metal pipe, the other pipe end side of the tapered pipe section having a thick-walled portion formed to be thicker than the pipe section side, the pipe fitting processing device performing a scraping process on an inner peripheral surface of the thick-walled portion,
an apparatus body having a table and a base disposed at a distance from the table;
A mold formed into a three-dimensional shape having a mold surface and a mold back surface arranged parallel to the mold surface at a distance;
A threshing unit having N (an integer of 3 or more) threshing tools and a holding shaft;
An actuator;
The mold is
a tube holding hole formed in the die, the tube holding hole opening on a surface of the die, the tube holding hole being formed in a shape following the outer circumferential surface of the tube portion and the outer circumferential surface of the tapered tube portion in that order from the die surface;
a retreat hole having the same diameter as the outer diameter of the other tube end of the tapered tube portion, arranged concentrically with the tube holding hole, formed in the die between the tube holding hole and the back surface of the die, and opening into the tube holding hole and the back surface of the die,
a mold surface is disposed between the base and the table and fixed to the table, the mold surface facing the base;
The reducer pipe joint includes:
The other tube end is inserted into the tube holding hole of the mold,
A tube is placed in the tube holding hole from the mold surface.
The outer circumferential surface of the tube portion and the outer circumferential surface of the tapered tube portion are abutted against the tube holding hole and held by the die;
Each of the above-mentioned threshing tools is
A stroking portion formed in a spherical trapezoid shape having a pair of planes, a spherical zone, and a spherical center;
a through hole that is disposed concentrically with the slit portion, passes through the slit portion in a direction of a sphere center line that passes through a sphere center of the slit portion and is perpendicular to each of the planes, and that opens onto each of the planes;
The retaining shaft is arranged concentrically with the retaining shaft, fitted onto the retaining shaft, and fixed to the retaining shaft adjacent to the retaining shaft in the direction of the axial center line of the retaining shaft;
The retaining shaft is
The respective squeegees are disposed adjacent to each other in a direction of an axial center line of the holder shaft through the through holes of the respective squeegees, and N of the squeegee parts are held between the respective axial ends of the holder shaft;
In the first stroking tool from one axial end of the holder shaft, the stroking portion is
The tapered tube portion is formed into a spherical trapezoid shape having a spherical diameter that exceeds an inner diameter of the thick-walled portion of the tapered tube portion and is smaller than a standard inner diameter of a product standard of the other tube end,
In the N-th stroking tool from one axial end of the holder shaft, the stroking portion is
The ball is formed into a spherical trapezoid shape having a spherical diameter equal to the standard inner diameter,
In each of the threshing tools between the first and Nth, the threshing portion is
The ball is formed in a spherical trapezoid shape having a spherical diameter that is greater than the spherical diameter of the adjacent striated portion on the one shaft end side and smaller than the standard inner diameter,
The said threshing unit is
Each of the threading tools is arranged concentrically with the tube holding hole,
One shaft end of the holder shaft is disposed between the base and the table, facing the table;
one end of the retaining shaft is inserted into the tubular portion with a gap between the spherical band of each of the stroking portions and an inner circumferential surface of the tubular portion held by the die;
The actuator comprises:
a second shaft end of the holder shaft connected to the second shaft end of the holder shaft and fixed to the base;
a first position at which the striking unit is spaced apart from one axial end of the holder shaft and the die surface, and a second position at which each of the striking tools is disposed in the evacuation hole, in a direction of an axial center line of the holder shaft. A reducer pipe fitting includes a pipe section at one pipe end side of a metal pipe, and a tapered pipe section whose diameter is gradually reduced from the pipe section toward the other pipe end of the metal pipe, the other pipe end side of the tapered pipe section having a thick-walled portion formed thicker than the pipe section side, the reducer pipe fitting processing device performing a scraping process on an inner peripheral surface of the thick-walled portion,
an apparatus body having a table and a base disposed at a distance from the table;
A mold formed into a three-dimensional shape having a mold surface and a mold back surface arranged parallel to the mold surface at a distance;
A threshing unit having one threshing tool and a holding shaft;
An actuator;
The mold is
a tube holding hole formed in the die, the tube holding hole opening on a surface of the die, the tube holding hole being formed in a shape following the outer circumferential surface of the tube portion and the outer circumferential surface of the tapered tube portion in that order from the die surface;
a retreat hole having the same diameter as the outer diameter of the other tube end of the tapered tube portion, arranged concentrically with the tube holding hole, formed in the die between the tube holding hole and the back surface of the die, and opening into the tube holding hole and the back surface of the die,
a mold surface is disposed between the base and the table and fixed to the table, the mold surface facing the base;
The reducer pipe joint includes:
The other tube end is inserted into the tube holding hole of the mold,
A tube is placed in the tube holding hole from the mold surface.
The outer circumferential surface of the tube portion and the outer circumferential surface of the tapered tube portion are abutted against the tube holding hole and held by the die;
The said threshing tool is
A stroking portion formed in a spherical trapezoid shape having a pair of flat surfaces, a spherical zone, and a spherical center;
a through hole that is disposed concentrically with the slit portion, passes through the slit portion in a direction of a sphere center line that passes through a sphere center of the slit portion and is perpendicular to each of the planes, and that opens onto each of the planes;
The holder shaft is arranged concentrically with the holder shaft, fitted around the holder shaft, and fixed to the holder shaft;
The retaining shaft is
The one striator is held between each shaft end of the holder shaft by passing through the through hole of the striator,
In the threshing tool, the threshing portion is
The other pipe end is formed into a spherical trapezoid shape having a spherical diameter equal to the standard inner diameter of the product standard of the other pipe end,
The said threshing unit is
The threading tool is arranged concentrically with the tube holding hole,
One shaft end of the holder shaft is disposed between the base and the table, facing the table;
one end of the retaining shaft is inserted into the tubular portion with a gap between the spherical band of the stroking portion and an inner circumferential surface of the tubular portion held by the die;
The actuator comprises:
a second shaft end of the holder shaft connected to the second shaft end of the holder shaft and fixed to the base;
a first position at which the striking unit is spaced apart from one axial end of the holder shaft and the die surface, and a second position at which the striking tool is disposed in the evacuation hole, in a direction of an axial center line of the holder shaft. A reducer pipe fitting includes a pipe section at one pipe end side of a metal pipe, and a tapered pipe section whose diameter is gradually reduced from the pipe section toward the other pipe end of the metal pipe, and the other pipe end side of the tapered pipe section has a thick-walled portion formed to be thicker than the pipe section side, the reducer pipe fitting processing device performs a scraping process on an inner peripheral surface of the thick-walled portion,
an apparatus body having a table and a base disposed at a distance from the table;
A mold formed into a three-dimensional shape having a mold surface and a mold back surface arranged parallel to the mold surface at a distance;
A threshing unit having two threshing tools and a holding shaft;
An actuator;
The mold is
a tube holding hole formed in the die, the tube holding hole opening on a surface of the die and formed in a shape following the outer circumferential surface of the tube portion and the outer circumferential surface of the tapered tube portion in this order from the die surface;
a retreat hole having the same diameter as the outer diameter of the other tube end of the tapered tube portion, arranged concentrically with the tube holding hole, formed in the die between the tube holding hole and the back surface of the die, and opening into the tube holding hole and the back surface of the die,
a mold surface is disposed between the base and the table and fixed to the table, the mold surface facing the base;
The reducer pipe joint includes:
The other tube end is inserted into the tube holding hole of the mold,
A tube is placed in the tube holding hole from the mold surface.
The outer circumferential surface of the tube portion and the outer circumferential surface of the tapered tube portion are abutted against the tube holding hole and held by the die;
Each of the above-mentioned threshing tools is
A stroking portion formed in a spherical trapezoid shape having a pair of planes, a spherical zone, and a spherical center;
a through hole that is disposed concentrically with the slit portion, passes through the slit portion in a direction of a sphere center line that passes through a sphere center of the slit portion and is perpendicular to each of the planes, and that opens onto each of the planes;
The retaining shaft is arranged concentrically with the retaining shaft, fitted onto the retaining shaft, and fixed to the retaining shaft adjacent to the retaining shaft in the direction of the axial center line of the retaining shaft;
The retaining shaft is
The two sieving parts are held between the respective shaft ends of the holder shaft by arranging the sieving tools adjacent to each other in a direction of an axial center line of the holder shaft through the through holes of the respective sieving tools;
In the first stroking tool from one axial end of the holder shaft, the stroking portion is
The tapered tube portion is formed into a spherical trapezoid shape having a spherical diameter that exceeds an inner diameter of the thick-walled portion of the tapered tube portion and is smaller than a standard inner diameter of a product standard of the other tube end,
In the second stroking tool from one axial end of the holder shaft, the stroking portion is
The ball is formed into a trapezoidal shape having a spherical diameter equal to the specified inner diameter,
The said threshing unit is
Each of the threading tools is arranged concentrically with the tube holding hole,
One shaft end of the holder shaft is disposed between the base and the table, facing the table;
one end of the retaining shaft is inserted into the tubular portion with a gap between the spherical band of each of the stroking portions and an inner circumferential surface of the tubular portion held by the die;
The actuator comprises:
a second shaft end of the holder shaft connected to the second shaft end of the holder shaft and fixed to the base;
a first position at which the striking unit is spaced apart from one axial end of the holder shaft and the die surface, and a second position at which each of the striking tools is disposed in the evacuation hole, in a direction of an axial center line of the holder shaft. A reducer pipe fitting includes a pipe section at one pipe end side of a metal pipe, and a tapered pipe section whose diameter is gradually reduced from the pipe section toward the other pipe end of the metal pipe, the other pipe end side of the tapered pipe section having a thick-walled portion formed to be thicker than the pipe section side, the reducer pipe fitting comprising: a striking unit used to perform a striking process on an inner peripheral surface of the thick-walled portion,
N (an integer equal to or greater than 3) pieces of threshing tools;
A holder shaft;
Each of the above-mentioned threshing tools is
A stroking portion formed in a spherical trapezoid shape having a pair of flat surfaces, a spherical zone, and a spherical center;
a through hole that is disposed concentrically with the slit portion, passes through the slit portion in a direction of a sphere center line that passes through a sphere center of the slit portion and is perpendicular to each of the planes, and that opens onto each of the planes;
The retaining shaft is arranged concentrically with the retaining shaft, fitted onto the retaining shaft, and fixed to the retaining shaft adjacent to the retaining shaft in the direction of the axial center line of the retaining shaft;
The retaining shaft is
The respective squeegees are disposed adjacent to each other in a direction of an axial center line of the holder shaft through the through holes of the respective squeegees, and N of the squeegee parts are held between the respective axial ends of the holder shaft;
In the first stroking tool from one axial end of the holder shaft, the stroking portion is
The tapered tube portion is formed into a spherical trapezoid shape having a spherical diameter that exceeds an inner diameter of the thick-walled portion of the tapered tube portion and is smaller than a standard inner diameter of a product standard of the other tube end,
In the N-th stroking tool from one axial end of the holder shaft, the stroking portion is
The ball is formed into a spherical trapezoid shape having a spherical diameter equal to the standard inner diameter,
In each of the threshing tools between the first and Nth, the threshing portion is
a triturating unit formed in a spherical trapezoid shape having a spherical diameter that is greater than a spherical diameter of the triturating portion adjacent to the one tube end side and less than the standard inner diameter. A reducer pipe fitting includes a pipe section at one pipe end side of a metal pipe, and a tapered pipe section whose diameter is gradually reduced from the pipe section toward the other pipe end of the metal pipe, the other pipe end side of the tapered pipe section having a thick-walled portion formed to be thicker than the pipe section side, the reducer pipe fitting comprising: a striking unit used to perform a striking process on an inner peripheral surface of the thick-walled portion,
One threshing tool,
A holder shaft;
The said threshing tool is
A stroking portion formed in a spherical trapezoid shape having a pair of flat surfaces, a spherical zone, and a spherical center;
a through hole that is disposed concentrically with the slit portion, passes through the slit portion in a direction of a sphere center line that passes through a sphere center of the slit portion and is perpendicular to each of the planes, and that opens onto each of the planes;
The holder shaft is arranged concentrically with the holder shaft, fitted around the holder shaft, and fixed to the holder shaft;
The retaining shaft is
Each of the striators is held between the shaft ends of the holder shaft by passing through the through hole of the striator,
In the threshing tool, the threshing portion is
The triturating unit is formed into a spherical trapezoid shape having a spherical diameter equal to the standard inner diameter of the product standard of the other tube end. A reducer pipe fitting includes a pipe section at one pipe end side of a metal pipe, and a tapered pipe section whose diameter is gradually reduced from the pipe section toward the other pipe end of the metal pipe, the other pipe end side of the tapered pipe section having a thick-walled portion formed to be thicker than the pipe section side, the reducer pipe fitting comprising: a striking unit used to perform a striking process on an inner peripheral surface of the thick-walled portion,
Two handles,
A holder shaft;
Each of the above-mentioned threshing tools is
A stroking portion formed in a spherical trapezoid shape having a pair of planes, a spherical zone, and a spherical center;
a through hole that is disposed concentrically with the slit portion, passes through the slit portion in a direction of a sphere center line that passes through a sphere center of the slit portion and is perpendicular to each of the planes, and that opens onto each of the planes;
The retaining shaft is arranged concentrically with the retaining shaft, fitted onto the retaining shaft, and fixed to the retaining shaft adjacent to the retaining shaft in the direction of the axial center line of the retaining shaft;
The retaining shaft is
The two sieving parts are held between the shaft ends of the holder shaft by arranging the sieving tools adjacent to each other in a direction of an axial center line of the holder shaft through the through holes of the sieving tools,
In the first stroking tool from one axial end of the holder shaft, the stroking portion is
The tapered tube portion is formed into a spherical trapezoid shape having a spherical diameter that exceeds an inner diameter of the thick-walled portion of the tapered tube portion and is smaller than a standard inner diameter of a product standard of the other tube end,
In the second stroking tool from one axial end of the holder shaft, the stroking portion is
The threshing unit is formed in a spherical trapezoid shape having a spherical diameter equal to the standard inner diameter. a reducer pipe joint comprising a pipe section at one pipe end side of a metal pipe and a tapered pipe section whose diameter is gradually reduced from the pipe section toward the other pipe end of the metal pipe, the other pipe end side of the tapered pipe section having a thick portion formed to be thicker than the pipe section side;
A mold formed into a three-dimensional shape having a mold surface and a mold back surface arranged parallel to the mold surface at a distance;
A threshing unit having N (an integer of 3 or more) threshing tools and a holding shaft;
The mold is
a tube holding hole formed in the die, the tube holding hole opening on a surface of the die, the tube holding hole being formed in a shape following the outer circumferential surface of the tube portion and the outer circumferential surface of the tapered tube portion in that order from the die surface;
a retreat hole having the same diameter as the outer diameter of the other tube end of the tapered tube portion, arranged concentrically with the tube holding hole, formed in the die between the tube holding hole and the back surface of the die, and opening into the tube holding hole and the back surface of the die,
Each of the above-mentioned threshing tools is
A stroking portion formed in a spherical trapezoid shape having a pair of planes, a spherical zone, and a spherical center;
a through hole that is disposed concentrically with the slit portion, passes through the slit portion in a direction of a sphere center line that passes through a sphere center of the slit portion and is perpendicular to each of the planes, and that opens onto each of the planes;
The retaining shaft is arranged concentrically with the retaining shaft, fitted onto the retaining shaft, and fixed to the retaining shaft adjacent to the retaining shaft in the direction of the axial center line of the retaining shaft;
The retaining shaft is
The N number of the squeegees are disposed adjacent to each other in a direction of an axial center line of the holding shaft through the through holes of the N number of squeegees, and the N number of the squeegees are held between each axial end of the holding shaft;
In the first stroking tool from one axial end of the holder shaft, the stroking portion is
The tapered tube portion is formed into a spherical trapezoid shape having a spherical diameter that exceeds an inner diameter of the thick-walled portion of the tapered tube portion and is smaller than a standard inner diameter of a product standard of the other tube end,
In the N-th stroking tool from one axial end of the holder shaft, the stroking portion is
The ball is formed into a spherical trapezoid shape having a spherical diameter equal to the standard inner diameter,
In each of the threshing tools between the first and Nth, the threshing portion is
The ball is formed in a spherical trapezoid shape having a spherical diameter that is greater than the spherical diameter of the adjacent striated portion on the one shaft end side and smaller than the standard inner diameter,
The said threshing unit is
Each of the threading tools is arranged concentrically with the tube holding hole,
One end of the holder shaft is disposed facing the mold surface,
a first position at which one shaft end of the holder shaft is spaced from the mold surface;
A method for processing a pipe joint, comprising the steps of:
a pipe holding process for inserting the reducer pipe fitting into the pipe holding hole of the die from the other pipe end, and abutting an outer circumferential surface of the pipe portion and an outer circumferential surface of the tapered pipe portion against the pipe holding hole to hold the reducer pipe fitting in the die;
a striking step of moving the striking unit from the first position toward the evacuation hole following the tube holding step, and inserting the N striking tools into the evacuation hole, starting from the first striking tool and passing through the tube portion and the tapered tube portion held by the die in that order,
In the threshing process, the N threshing tools include:
and as the scraping unit moves, the spherical bands of the N scraping parts, starting from the first scraping part, are moved in sequence toward the retreat hole while being pressed against the inner surface of the thick-walled portion, and each of the scraping parts that has pressed the spherical band against the thick-walled portion scrapes the thick-walled portion, stretching it and thinning it, thereby forming the other pipe end side, including the other pipe end of the tapered pipe portion, to the standard inner diameter. a reducer pipe joint comprising a pipe section at one pipe end side of a metal pipe and a tapered pipe section whose diameter is gradually reduced from the pipe section toward the other pipe end of the metal pipe, the other pipe end side of the tapered pipe section having a thick portion formed to be thicker than the pipe section side;
A mold formed into a three-dimensional shape having a mold surface and a mold back surface arranged parallel to the mold surface at a distance;
A threshing unit having one threshing tool and a holding shaft,
The mold is
a tube holding hole formed in the die, the tube holding hole opening on a surface of the die, the tube holding hole being formed in a shape following the outer circumferential surface of the tube portion and the outer circumferential surface of the tapered tube portion in that order from the die surface;
a retreat hole having the same diameter as the outer diameter of the other tube end of the tapered tube portion, arranged concentrically with the tube holding hole, formed in the die between the tube holding hole and the back surface of the die, and opening into the tube holding hole and the back surface of the die,
The said threshing tool is
A stroking portion formed in a spherical trapezoid shape having a pair of flat surfaces, a spherical zone, and a spherical center;
a through hole that is disposed concentrically with the rubbing portion, passes through the rubbing portion in a direction of a sphere center line that passes through a sphere center of the rubbing portion and is perpendicular to each of the planes, and that opens onto each of the planes;
The holder shaft is arranged concentrically with the holder shaft, fitted around the holder shaft, and fixed to the holder shaft;
The retaining shaft is
Each of the striators is held between the shaft ends of the holder shaft by passing through the through hole of the striator,
In the threshing tool, the threshing portion is
The other pipe end is formed into a spherical trapezoid shape having a spherical diameter equal to the standard inner diameter of the product standard of the other pipe end,
The said threshing unit is
The threading tool is arranged concentrically with the tube holding hole,
One end of the holder shaft is disposed facing the mold surface,
a first position at which one shaft end of the holder shaft is spaced from the mold surface;
A method for processing a pipe joint, comprising the steps of:
a pipe holding process for inserting the reducer pipe fitting into the pipe holding hole of the die from the other pipe end, and abutting an outer circumferential surface of the pipe portion and an outer circumferential surface of the tapered pipe portion against the pipe holding hole to hold the reducer pipe fitting in the die;
a striking step of moving the striking unit from the first position toward the evacuation hole following the tube holding step, passing the single striking tool through the tube portion and the tapered tube portion held by the die in that order, and inserting the striking tool into the evacuation hole,
In the threshing process, the one threshing tool is
a first end of the tapered pipe portion including the second end of the tapered pipe portion being pressed against the inner circumferential surface of the thick-walled portion, the first end of the tapered pipe portion being pressed against the inner circumferential surface of the thick-walled portion, and the second end of the tapered pipe portion being pressed against the inner circumferential surface of the thick-walled portion, the second end of the tapered pipe portion being pressed against the inner circumferential surface of the thick-walled portion, the second end of the tapered pipe portion being pressed against the inner circumferential surface of the thick-walled portion, and the second end of the tapered pipe portion being pressed against the inner circumferential surface of the thick-walled portion. a reducer pipe joint comprising a pipe section at one pipe end side of a metal pipe and a tapered pipe section whose diameter is gradually reduced from the pipe section toward the other pipe end of the metal pipe, the other pipe end side of the tapered pipe section having a thick portion formed to be thicker than the pipe section side;
A mold formed into a three-dimensional shape having a mold surface and a mold back surface arranged parallel to the mold surface at a distance;
A threshing unit having two threshing tools and a holding shaft,
The mold is
a tube holding hole formed in the die, the tube holding hole opening on a surface of the die, the tube holding hole being formed in a shape following the outer circumferential surface of the tube portion and the outer circumferential surface of the tapered tube portion in that order from the die surface;
a retreat hole having the same diameter as the outer diameter of the other tube end of the tapered tube portion, arranged concentrically with the tube holding hole, formed in the die between the tube holding hole and the back surface of the die, and opening into the tube holding hole and the back surface of the die,
Each of the above-mentioned threshing tools is
A stroking portion formed in a spherical trapezoid shape having a pair of planes, a spherical zone, and a spherical center;
a through hole that is disposed concentrically with the rubbing portion, passes through the rubbing portion in a direction of a sphere center line that passes through a sphere center of the rubbing portion and is perpendicular to each of the planes, and that opens onto each of the planes;
The retaining shaft is arranged concentrically with the retaining shaft, fitted onto the retaining shaft, and fixed to the retaining shaft adjacent to the retaining shaft in the direction of the axial center line of the retaining shaft;
The retaining shaft is
The two squeegees are disposed adjacent to each other in a direction of an axial center line of the holder shaft through the through holes of the two squeegees, and N squeegee portions are held between the respective axial ends of the holder shaft;
In the first stroking tool from one axial end of the holder shaft, the stroking portion is
The tapered tube portion is formed into a spherical trapezoid shape having a spherical diameter that exceeds an inner diameter of the thick-walled portion of the tapered tube portion and is smaller than a standard inner diameter of a product standard of the other tube end,
In the second stroking tool from one axial end of the holder shaft, the stroking portion is
The ball is formed into a spherical trapezoid shape having a spherical diameter equal to the standard inner diameter,
The said threshing unit is
Each of the threading tools is arranged concentrically with the tube holding hole,
One end of the holder shaft is disposed facing the mold surface,
a first position at which one shaft end of the holder shaft is spaced from the mold surface;
A method for processing a pipe joint, comprising the steps of:
a pipe holding process for inserting the reducer pipe fitting into the pipe holding hole of the die from the other pipe end, and abutting an outer circumferential surface of the pipe portion and an outer circumferential surface of the tapered pipe portion against the pipe holding hole to hold the reducer pipe fitting in the die;
a striking step of moving the striking unit from the first position toward the retreat hole subsequent to the tube holding step, and inserting the two striking tools, starting from the first striking tool, through the tube portion and the tapered tube portion held by the die in that order, into the retreat hole,
In the threshing process, the two threshing tools are
a first cutting portion and a second cutting portion, in that order, that press the spherical bands against the inner circumferential surface of the thick-walled portion, and the second cutting portion are moved toward the retraction hole while being pressed against the inner circumferential surface of the thick-walled portion as the cutting unit moves, and the thick-walled portion is treated and stretched by each of the cutting portions that has pressed the spherical band against the thick-walled portion, thereby thinning the other pipe end side, including the other pipe end of the tapered pipe portion, to the standard inner diameter.

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