CN117715711A - Apparatus and method for manufacturing oil supply pipe - Google Patents
Apparatus and method for manufacturing oil supply pipe Download PDFInfo
- Publication number
- CN117715711A CN117715711A CN202280050753.6A CN202280050753A CN117715711A CN 117715711 A CN117715711 A CN 117715711A CN 202280050753 A CN202280050753 A CN 202280050753A CN 117715711 A CN117715711 A CN 117715711A
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- pipe
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- peripheral surface
- molding
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000002184 metal Substances 0.000 claims abstract description 101
- 238000000465 moulding Methods 0.000 claims abstract description 98
- 239000002994 raw material Substances 0.000 claims abstract description 23
- 238000003825 pressing Methods 0.000 claims abstract description 6
- 230000002093 peripheral effect Effects 0.000 claims description 58
- 238000002360 preparation method Methods 0.000 claims description 5
- 239000000446 fuel Substances 0.000 description 12
- 238000010586 diagram Methods 0.000 description 7
- 238000012545 processing Methods 0.000 description 6
- 239000002828 fuel tank Substances 0.000 description 4
- 238000012733 comparative method Methods 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D51/00—Making hollow objects
- B21D51/02—Making hollow objects characterised by the structure of the objects
- B21D51/10—Making hollow objects characterised by the structure of the objects conically or cylindrically shaped objects
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D15/00—Corrugating tubes
- B21D15/04—Corrugating tubes transversely, e.g. helically
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D17/00—Forming single grooves in sheet metal or tubular or hollow articles
- B21D17/04—Forming single grooves in sheet metal or tubular or hollow articles by rolling
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
The present invention relates to an apparatus for manufacturing an oil feed pipe and a method for manufacturing an oil feed pipe. The method for manufacturing the oil supply pipe comprises using a 1 st molding roller having a 1 st rotation axis, a first circumferential surface, and one 1 st raised line portion, wherein the 1 st raised line portion is spirally provided along the circumferential direction of the first circumferential surface in a length smaller than one circle, and a 2 nd molding roller having a 2 nd rotation axis, a 2 nd circumferential surface, and a 2 nd raised line portion, wherein the 2 nd molding roller is spirally provided along the circumferential direction of the 2 nd circumferential surface, inserting a metal pipe into the 2 nd molding roller, arranging the 1 st rotation axis and the 2 nd rotation axis in parallel with each other, and pressing a raw material for forming the metal pipe between the 2 nd raised line portions by the 1 st raised line portion while rotating the 1 st molding roller and the 2 nd molding roller, thereby forming a screw thread portion composed of spiral protrusions on the inner circumferential surface of the metal pipe.
Description
Technical Field
The present invention relates to an apparatus for manufacturing an oil feed pipe and a method for manufacturing an oil feed pipe.
The present application is based on Japanese patent application No. 2021-122632 filed at 2021, 7 and 27 and claims priority, the contents of which are incorporated herein.
Background
A fuel tank of an automobile or the like is provided with a fuel pipe for filling fuel into the tank during refueling. This supply line is sometimes also referred to as a fuel inlet line. The raw material of the oil feed pipe is generally a metal material such as plain steel or stainless steel, and recently, a resin oil feed pipe is also used. The oil supply pipe has a pipe main body and an expanded pipe portion provided at one end side of the pipe main body. The other end of the tube body is connected to the fuel tank. An oil supply port is arranged at the pipe expanding part. A screw thread portion is provided on the inner side of the pipe expansion portion. The screw portion is a spiral convex portion protruding from the inner surface of the expanded pipe portion. When the oil supply cap is mounted on the oil supply port, the screw portion of the oil supply cap is screwed into the screw portion of the expanded pipe portion.
Conventionally, in manufacturing an oil supply pipe, after manufacturing a pipe body and an expanded pipe portion separately, the expanded pipe portion is joined to one end side of the pipe body by welding or the like. However, recently, in order to reduce man-hours and the number of parts, an oil feed pipe has been proposed in which a pipe body and an expanded diameter portion are integrally formed. Such an oil supply pipe is manufactured by expanding one end side of a raw material pipe to form an expanded pipe portion, and forming a peripheral wall surface of the expanded pipe portion to form a screw portion.
As an example of a method for manufacturing an oil feed pipe, fig. 11 of patent document 1 below describes the following method: when a metal pipe is threaded, the metal pipe is covered on a mandrel in which a molding groove is formed, and if the metal pipe and the mandrel start to rotate integrally, a ridge molding portion of a molding roller rotating in a direction opposite to the mandrel is pressed against the metal pipe, and the ridge molding portion is plastically deformed to gradually mold a threaded portion for molding the molding groove. In the method for forming a screw thread described in fig. 11 of patent document 1, two ridge forming portions 102a are provided on the forming roller 102. Then, by pressing the ridge forming portion 102a from the outside of the metal pipe, the metal pipe is partially recessed, and a spiral convex portion is provided on the inside of the pipe. As shown in fig. 11 of patent document 1, when viewed in the axial direction of the rotation axis of the molding roll 102, a part of each ridge molding portion 102a of the molding roll 102 overlaps. More specifically, in fig. 11 of patent document 1, the vicinity of the distal end portion of the upper ridge forming portion 102a overlaps the vicinity of the distal end portion of the lower ridge forming portion 102a when viewed in the axial direction of the rotation shaft.
Prior art literature
Patent literature
Patent document 1: japanese patent No. 3462427
Disclosure of Invention
Problems to be solved by the invention
The problem in the case of using the molding roll described in patent document 1 will be described with reference to fig. 9 to 11. Fig. 9 is a schematic plan view and a schematic front view of a conventional mold roll. Fig. 10 shows a schematic side view of the forming roll of fig. 9 rotated 90 °. Fig. 11 is a process diagram showing a case where a screw portion is formed by a conventional forming roll. As shown in fig. 9 and 10, two raised strips 302a and 302b are provided on the peripheral surface of the cylindrical molding roll 301. When viewed in the axial direction of the rotation axis of the molding roll 301, the vicinity of the end of the ridge 302a overlaps the vicinity of the end of the other ridge 302b. More specifically, as shown in fig. 10, the end 302a of the ridge 302a is seen in the axial direction of the rotation axis 1 Near and at the ends 302b of the ridges 302b 1 The vicinity overlaps. When forming a screw portion on a metal tube 401 using such a forming roller 301 as in patent document 1, as shown in fig. 11, the metal tube 401 and an end 302a of one ridge 302a are formed 1 Near and at the end 302b of the other ridge 302b 1 The vicinity is simultaneously contacted. Then, the metal tube 401 is simultaneously processed by the two raised strips 302a, 302b. At the portion M where the two raised strips 302a, 302b are simultaneously processed, the metal tube 401 is stretched in the longitudinal direction thereof, and the raw material is thinned. As a result, cracks are likely to occur in the metal pipe after the machining starting from the thinned portion.
In particular, when the thread portion is formed in the expanded diameter portion after the expanded diameter portion is formed by expanding the raw material pipe, the raw material in the expanded diameter portion is work-hardened in the stage of expanding the raw material pipe, and therefore, cracks are more likely to occur by forming the thread portion.
The present invention has been made in view of the above circumstances, and an object thereof is to provide an apparatus for manufacturing an oil feed pipe and a method for manufacturing an oil feed pipe, which can prevent occurrence of cracks when forming a screw portion in a metal pipe.
Means for solving the problems
In order to solve the above problems, the present invention adopts the following configuration.
[1] In one embodiment of the present invention, an apparatus for manufacturing an oil feed pipe, which is configured to form a screw portion on a metal pipe by disposing a 1 st forming roll on an outer peripheral surface side of the metal pipe, disposing a 2 nd forming roll on an inner peripheral surface side of the metal pipe, and roll-forming the metal pipe by the 1 st forming roll and the 2 nd forming roll, comprises:
the 1 st molding roll comprises a 1 st rotation axis, a first circumferential surface, and a 1 st raised line spirally arranged on the first circumferential surface along the circumferential direction with a length smaller than one circle; and
the 2 nd molding roll has a 2 nd rotation axis, a 2 nd peripheral surface, and a 2 nd ridge portion spirally provided on the 2 nd peripheral surface along the circumferential direction,
the 1 st rotation axis and the 2 nd rotation axis are arranged in parallel,
the 1 st molding roll and the 2 nd molding roll rotate.
[2] In another aspect of the present invention, there is provided a method for manufacturing an oil supply pipe, comprising disposing a 1 st forming roll on an outer peripheral surface side of a metal pipe, disposing a 2 nd forming roll on an inner peripheral surface side of the metal pipe, roll-forming the metal pipe by the 1 st forming roll and the 2 nd forming roll to form a screw portion on the metal pipe, wherein,
as the 1 st molding roll, a 1 st molding roll having a 1 st rotation axis, a first circumferential surface, and a 1 st ridge portion spirally provided on the first circumferential surface along a length smaller than one circumference,
as the 2 nd molding roll, a 2 nd molding roll having a 2 nd rotation shaft, a 2 nd peripheral surface, and a 2 nd ridge portion provided on the 2 nd peripheral surface in a spiral shape along the circumferential direction is used,
the method for manufacturing the oil supply pipe comprises the following steps:
a preparation step of inserting the metal pipe into the 2 nd forming roller and arranging the 1 st rotation axis and the 2 nd rotation axis in parallel with each other; and
and a molding step of forming the screw portion formed of spiral protrusions on the inner peripheral surface of the metal pipe by pressing the raw material for forming the metal pipe between the 2 nd ridge portions through the 1 st ridge portion while rotating the 1 st molding roller and the 2 nd molding roller.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the above aspect of the present invention, it is possible to provide an apparatus for manufacturing an oil feed pipe and a method for manufacturing an oil feed pipe, which can prevent occurrence of cracks when forming a screw portion in a metal pipe.
Drawings
Fig. 1 is a schematic front view showing a 1 st molding roll and a 2 nd molding roll provided in an apparatus for manufacturing an oil pipe according to an embodiment of the present invention.
Fig. 2A is a schematic front view of the 1 st mold roll of fig. 1 from another angle.
Fig. 2B is a schematic plan view showing the 1 st mold roll.
Fig. 3 is a cross-sectional view showing a main part of an apparatus for manufacturing an oil pipe according to an embodiment of the present invention.
Fig. 4 is a schematic front view showing a main part of an oil supply pipe obtained by the manufacturing apparatus or the manufacturing method according to the embodiment of the present invention.
Fig. 5 is a schematic partial cross-sectional view showing a threaded portion of an oil feed pipe according to an embodiment of the present invention.
Fig. 6 is a schematic plan view illustrating a method for manufacturing an oil feed pipe according to an embodiment of the present invention.
Fig. 7 is a diagram showing a main portion of the fuel supply pipe according to the embodiment of the present invention, and is a diagram illustrating a circumferential angle θ.
Fig. 8 is a diagram illustrating a method of manufacturing the fuel supply pipe, (a) is a diagram illustrating a comparative method, and (b) is a diagram illustrating the present embodiment.
Fig. 9 is a schematic plan view and a schematic front view showing a conventional molding roll.
Fig. 10 is a schematic front view of the conventional molding roll of fig. 9 from another angle.
Fig. 11 is a schematic diagram illustrating a method of forming a screw portion using a conventional forming roll.
Detailed Description
Hereinafter, an apparatus and a method for manufacturing an oil pipe according to an embodiment of the present invention will be described with reference to the accompanying drawings.
(apparatus for manufacturing oil supply pipe)
The apparatus for manufacturing the fuel supply pipe according to the present embodiment will be described.
Fig. 1 shows a 1 st molding roll and a 2 nd molding roll provided in the apparatus for manufacturing an oil feed pipe according to the present embodiment. Fig. 2A shows the 1 st molding roll rotated 90 ° from the state shown in fig. 1, and fig. 2B shows a schematic plan view of the 1 st molding roll. Fig. 3 is a cross-sectional view of a main part of the apparatus for manufacturing an oil supply pipe.
The apparatus 1 for manufacturing an oil feed pipe according to the present embodiment includes a 1 st molding roll 11 and a 2 nd molding roll 21 shown in fig. 1. The 1 st molding roll 11 and the 2 nd molding roll 21 are disposed separately, and the 1 st rotation axis 13 of the 1 st molding roll 11 and the 2 nd rotation axis 23 of the 2 nd molding roll 21 are disposed parallel to each other. The 1 st rotation shaft 13 of the 1 st molding roll 11 and the 2 nd rotation shaft 23 of the 2 nd molding roll 21 are connected to driving units, not shown. Each driving unit rotates the 1 st molding roll 11 and the 2 nd molding roll 21.
As shown in fig. 1, the 1 st forming roll 11 is composed of a 1 st roll main body 12 and a 1 st rotation shaft 13. The 1 st roller body 12 has a cylindrical shape, has a first peripheral surface 14 on the peripheral surface, and has one 1 st ridge 15 on the first peripheral surface 14.
As shown in fig. 1, 2A and 2B, the 1 st ridge portion 15 is a ridge protruding from the first peripheral surface 14, and is arranged spirally along the circumferential direction of the first peripheral surface 14. One end 15a and the other end 15b are provided in the 1 st ridge 15 along the longitudinal direction. The length from one end 15a to the other end 15b of the 1 st ridge 15, that is, the length of the 1 st ridge 15 is shorter than the length of one turn around the first peripheral surface 14 in a spiral shape. Thus, the 1 st ridge 15 is spirally provided along the circumferential direction of the first circumferential surface 14 with a length smaller than one turn.
As shown in fig. 2B, in a plan view of the 1 st molding roll 11 (in an axial direction of the 1 st rotation shaft 13), a circumferential angle θo (unit: rad) from one end 15a to the other end 15B of the 1 st ridge 15 in the longitudinal direction is smaller than one revolution (more than 0 and less than 2pi (more than 0 ° and less than 360 °). The circumferential angle θo is defined as follows. The circumferential angle θo of the 1 st ridge 15 is defined by the following angle: in a cross section of the 1 st roller body 12 perpendicular to the 1 st rotation axis 13, two straight lines SL1, SL2 connecting the straight line SL1 connecting the one end 15a of the 1 st ridge 15 and the center 13a of the 1 st roller body 12 and the straight line SL2 connecting the other end 15b of the 1 st ridge 15 and the center 13a of the 1 st roller body 12 form an angle. The circumferential angle θo is preferably pi (rad) or more (180 ° or more) and 1.5 pi (rad) or less (270 ° or less).
When the circumferential angle θo (unit: rad) is 2 pi or more, the other portion of the 1 st ridge 15 is located forward of the 1 st rotation axis 13 from the one end 15a of the 1 st ridge 15. In other words, a portion adjacent to the 1 st ridge 15 is formed on the first peripheral surface 14. Thus, at the time of molding the metal tube, different portions of the 1 st ridge portion 15 are simultaneously brought into contact with the metal tube to perform processing. In the portion where the processing is simultaneously performed by the different portions of the 1 st ridge portion 15, the metal pipe is stretched from both sides in the longitudinal direction thereof as a result of being restrained by the different two portions of the 1 st ridge portion 15, and therefore the raw material is thinned, and cracks are easily generated in the metal pipe after the processing starting from the thinned portion. In order to prevent such a problem, the circumferential angle θo (unit: rad) is made smaller than 2π.
As shown in fig. 1, the distance between one end 15a and the other end 15b of the 1 st ridge 15 in the 1 st rotation axis 13 direction is defined as the step Po of the 1 st ridge 15. When two parallel straight lines extending in the circumferential direction (left-right direction of the drawing) orthogonal to the 1 st rotation axis 13 direction (up-down direction of the drawing) are drawn from one end 15a and the other end 15b of the 1 st ridge 15, respectively, the step Po is the shortest distance between the parallel straight lines. The step difference Po of the 1 st ridge 15 will be described in detail later.
Fig. 3 shows a cross-sectional shape of the 1 st ridge 15. The 1 st ridge 15 has a base 15d protruding from the first peripheral surface 14 and a top 15c having an arc-shaped tip when viewed in cross section. The radius of curvature Ro of the top 15c of the 1 st ridge 15 will be described later.
Next, as shown in fig. 1 and 3, the 2 nd molding roll 21 is composed of a 2 nd roll body 22 having a 2 nd rotation shaft 23 and a 2 nd peripheral surface 24, and one 2 nd ridge 25. As shown in fig. 1, the 2 nd roller body 22 has a columnar shape. The outer diameter of the 2 nd roller main body 22 is smaller than the outer diameter of the 1 st roller main body 12. The 2 nd rotation shaft 23 is provided in the center of the lower surface of the 2 nd roller body 22. The circumferential surface of the 2 nd roller body 22 is a 2 nd circumferential surface 24. The 2 nd peripheral surface 24 is provided with a 2 nd ridge 25.
As shown in fig. 1, the 2 nd ridge portion 25 is a ridge protruding from the 2 nd peripheral surface 24, and is spirally arranged along the circumferential direction of the 2 nd peripheral surface 24 at a constant pitch Pi (unit: mm). The length from one end to the other end of the 2 nd ridge portion 25, that is, the length of the 2 nd ridge portion 25 is longer than the length of one turn around the 2 nd peripheral surface 24 in a spiral shape, for example, the length is 3 turns. That is, the 2 nd ridge 25 is provided in a spiral shape over one or more circles on the 2 nd peripheral surface 24. The distance between the adjacent 2 nd ridge portions 25, that is, the pitch Pi (unit: mm), will be described in detail later.
Fig. 3 shows a cross-sectional shape of the 2 nd ridge 25. The 2 nd ridge portion 25 has a base portion 25d protruding from the 2 nd peripheral surface 24, and a top portion 25c having an arc-shaped tip end when viewed in cross section. The radius of curvature Ri of the top 25c of the 2 nd ridge 25 will be described later.
Further, with respect to the relative positions of the 1 st molding roll 11 and the 2 nd molding roll 21 in the respective rotational axis directions, it is preferable that the relative positions of the 1 st molding roll 11 and the 2 nd molding roll 21 be adjusted such that the 1 st ridge 15 is located between the 2 nd ridge 25 as shown in fig. 3.
(method for manufacturing oil supply pipe)
Next, a method for manufacturing the fuel supply pipe according to the present embodiment will be described.
First, a metal pipe 2 to be processed in the method of manufacturing an oil feed pipe according to the present embodiment will be described. The fuel supply pipe is, for example, a fuel supply pipe for supplying fuel to a fuel tank of an automobile. The oil supply pipe has a pipe main body and an expanded pipe portion provided at one end side of the pipe main body. The other end of the tube body is connected to the fuel tank. An oil supply port is arranged at the pipe expanding part. A screw part protruding in a spiral shape is provided on the inner side of the pipe expanding part. Such an oil supply pipe is manufactured by forming an expanded pipe portion by expanding one end side of a raw material pipe and forming a screw portion by molding a peripheral wall surface of the expanded pipe portion.
The metal pipe 2 to be processed in the manufacturing method of the present embodiment is an expanded pipe portion obtained by expanding and forming one end side of a raw material pipe. As a raw material of the metal pipe 2 (expanded pipe portion), a metal material such as plain steel or stainless steel can be exemplified. In the present embodiment, the threaded portion 3 is formed in the metal pipe 2 (expanded pipe portion) by a manufacturing method described below.
Fig. 4 shows the appearance of the metal pipe 2 having the screw portion 3, which is the fuel feed pipe obtained by the manufacturing apparatus and the manufacturing method according to the present embodiment. A spiral groove 3a is formed in the outer peripheral surface 2a of the metal pipe 2 shown in fig. 4. Fig. 5 is a schematic partial cross-sectional view illustrating the threaded portion 3 of the metal pipe 2. The depth of the spiral groove 3a formed on the outer peripheral surface 2a side is greater than the thickness t (unit: mm) of the metal pipe 2. Thus, the inner peripheral surface 2b of the metal tube 2 is provided with the spiral protrusion 4 corresponding to the spiral groove 3a. The screw portion 3 is formed by the spiral protrusion 4.
The radius of curvature R (unit: mm) of the top portion 4c of the protrusion 4 constituting the screw portion 3 and the height h (unit: mm) of the protrusion 4 will be described in detail later. The entire length of the spiral protrusion 4 (groove 3 a) is longer than the length of one circumference of the outer peripheral surface 2a of the metal tube 2. The distance between adjacent spiral protrusions 4, that is, the pitch P (unit: mm) of the screw portion 3 will be described later.
In the method for manufacturing an oil feed pipe according to the present embodiment, the preparation step and the molding step are sequentially performed. Hereinafter, each step will be described in detail.
In the preparation process, the metal tube 2 is inserted into the 2 nd molding roll 21. Further, the molding rolls 11 and 21 are disposed so that the 1 st rotation axis 13 and the 2 nd rotation axis 23 are parallel to each other. That is, the 1 st forming roller 11 is disposed on the outer peripheral surface 2a side of the metal tube 2, and the 2 nd forming roller 21 is disposed on the inner peripheral surface 2b side of the metal tube 2. As shown in fig. 3, the relative positions of the 1 st molding roll 11 and the 2 nd molding roll 21 are adjusted such that the 1 st ridge 15 of the 1 st molding roll 11 is located between the 2 nd ridges 25 of the 2 nd molding roll 21.
Fig. 6 shows a state in which the metal tube 2 is inserted into the 2 nd molding roll 21 and the 1 st molding roll 11 is disposed on the outer peripheral surface 2a side of the metal tube 2 in the preparation step. The inner peripheral surface 2b of the metal tube 2 is disposed so as to face the 2 nd molding roller 21, while the outer peripheral surface 2a of the metal tube 2 is disposed so as to face the 1 st molding roller 11. The outer diameter of the 2 nd molding roll 21 including the 2 nd ridge portion 25 is substantially the same as the inner diameter of the metal tube 2 and slightly smaller.
Next, in the forming step, the metal tube 2 is roll-formed by rotating the 1 st forming roll 11 and the 2 nd forming roll 21 and pressing the raw material for forming the metal tube 2 between the 2 nd ridge portions 25 arranged in parallel on the 2 nd peripheral surface 24 of the 2 nd forming roll 21 through the 1 st ridge portions 15.
In the molding step, first, one end 15a of the 1 st ridge portion 15 is brought into contact with the outer peripheral surface 2a of the metal tube 2, and the 1 st molding roll 11 and the 2 nd molding roll 21 are rotated in opposite directions while the raw material of the metal tube 2 is pushed toward the 2 nd molding roll 21 by the 1 st ridge portion 15. The metal tube 2 rotates in the same rotational direction as the rotational direction of the 2 nd forming roller 21. Further, the metal tube 2 is sequentially pressed by the 1 st ridge 15 between the 2 nd ridge 25 by rotating the 1 st forming roller 11 while keeping the state in which the 1 st ridge 15 is pressed against the outer peripheral surface 2a. The pressing of the 1 st ridge portion 15 into the metal tube 2 continues until the other end 15b of the 1 st ridge portion 15 contacts the metal tube 2. Thereby, a spiral groove portion 3a is formed in the outer peripheral surface 2a of the metal pipe 2. The amount of press-fitting of the 1 st ridge 15 is larger than the thickness t of the metal tube 2. Thereby, the screw portion 3 composed of the spiral protrusion 4 is formed on the inner peripheral surface 2b of the metal pipe 2. Here, the case where the 1 st molding roll 11 and the 2 nd molding roll 21 are rotated in opposite directions is described as an example, but the present invention is not limited to this, and the same direction may be rotated.
As shown in fig. 7, the spiral protrusion 4 (groove 3 a) forming the screw portion 3 has a circumferential angle θ (unit: rad) between one end 4a and the other end 4b exceeding 2pi (exceeding 360 °). The upper limit of the circumferential angle θ may be 380 ° or less, or 370 ° or less. The circumferential angle θ is defined as follows. The circumferential angle θ of the spiral protrusion 4 forming the screw portion 3 is defined by the following angle: in a cross section orthogonal to the longitudinal direction of the metal pipe 2, the one end 4a of the connecting protrusion 4 forms an angle with two straight lines SL3, SL4, which are a straight line SL3 connecting the one end 4a of the protrusion 4 with the center of the metal pipe 2 and a straight line SL4 connecting the other end 4b of the protrusion 4 with the center of the metal pipe 2.
Fig. 8 shows a method of forming a screw portion according to the comparative method and a method of forming a screw portion according to the present embodiment, respectively.
In the comparative forming method shown in fig. 8 (a), the forming roller 301 shown in fig. 9 is used as the 1 st forming roller. Two 1 st raised strips 301a, 301b are provided on the first peripheral surface 314 of the 1 st molding roll 301. Thus, at the time of forming the metal tube 2, the two 1 st raised strips 301a and 301b are simultaneously brought into contact with the metal tube 2 at the portions adjacent to the 1 st raised strips 301a and 301b. Since the metal tube 2 is stretched from both sides in the longitudinal direction thereof as a result of the raw material being restrained by the two adjacent 1 st ridge portions 301a, 301b at the portions where the two 1 st ridge portions 301a, 301b are simultaneously processed, the raw material is thinned, and cracks easily occur in the metal tube 2 after processing starting from the thinned portions.
On the other hand, in the forming method of the present embodiment shown in fig. 8 (b), the 1 st forming roller 11 shown in fig. 1 is used. A 1 st ridge 15 is provided on the 1 st outer peripheral surface 14 of the 1 st molding roll 11 in a spiral shape along the circumferential direction with a length smaller than one turn. Thus, during molding of the metal tube 2, the first end 15a of the 1 st ridge 15 comes into contact with the metal tube 2 first, and the other end 15b comes into contact last. That is, the metal tube 2 is not simultaneously processed by different portions of the 1 st ridge portion 15. Therefore, the stress applied to the metal pipe 2 at the time of processing becomes small, and the reduction in the thickness of the raw material can be reduced as compared with the comparative method. This can suppress the occurrence of cracks. Thus, even when the material of the metal pipe 2 is stainless steel, which is more likely to crack than ordinary steel, it is possible to prevent the occurrence of cracks due to the formation of the threaded portion 3.
Hereinafter, a more preferable mode of the method for manufacturing the fuel supply pipe according to the present embodiment will be described.
In the above embodiment, in the molding step, it is preferable that the rotational speeds of the 1 st molding roll 11 and the 2 nd molding roll 21 be adjusted so that the absolute value v (= |vo/vi|) of the ratio of the rotational speed vo (unit: rad/sec) of the 1 st molding roll 11 to the rotational speed vi (unit: rad/sec) of the 2 nd molding roll 21 satisfies the following expression (1). As a result, as shown in fig. 3, the gap C between the 1 st ridge portion 15 and the 2 nd ridge portion 25 does not extremely increase or extremely decrease, and the metal tube 2 can be prevented from being broken when the groove portion 3a is formed.
θo/θ≥v≥(θo/(Pθ))·(2R+t/2)……(1)
In the above formula (1), θ (unit: rad) is a circumferential angle from one end 4a to the other end 4b in the longitudinal direction of the spiral protrusion 4 forming the screw portion 3, θo (unit: rad) is a circumferential angle from one end 15a to the other end 15b in the longitudinal direction of the 1 st ridge portion 15, R (unit: mm) is a radius of curvature (unit: mm) of the top portion 4c of the spiral protrusion 4, t (unit: mm) is a wall thickness of the metal tube 2, and P is a pitch (unit: mm) of the screw portion 3.
The radius of curvature Ri (unit: mm) of the top 25a of the 2 nd ridge portion 25 is preferably set to a range satisfying the following formula (2) with respect to the wall thickness t (unit: mm) of the metal tube 2.
Ri≥(3/4)·t……(2)
Further, it is preferable that the radius of curvature R (unit: mm) of the top 15c of the 1 st ridge 15 is set to a range satisfying the following formula (3) with respect to the wall thickness t (unit: mm) of the metal tube 2 and the radius of curvature R (unit: mm) of the top 4c of the spiral protrusion 4.
Rо≥R-2t……(3)
Further, it is preferable that the gap C (unit: mm) between the 1 st ridge 15 and the 2 nd ridge 25 is set to a range satisfying the following formula (4) with respect to the wall thickness t (unit: mm) of the metal tube 2.
C≥(3/2)·t……(4)
By satisfying the formulas (2) to (4), the gap C between the 1 st ridge portion 15 and the 2 nd ridge portion 25 does not extremely increase or extremely decrease, and the metal tube 2 can be prevented from being broken when the groove portion 3a is formed.
The shape of the 1 st ridge 15 is determined according to the design value of the spiral protrusion 4 to be formed. Accordingly, the step Po of the 1 st ridge 15 can be set so as to satisfy the following expression (5). The length r o of the 1 st ridge 15 in the case of the 1 st molding roll 11 in plan view (see fig. 2B) is preferably set so as to satisfy the following (6).
Po＝(θ/2π)·P……(5)
(θ/2)·(D-2h+4t)≥rоθо≥(θ/2)·(D-2h+t)……(6)
In the formulas (5) and (6), θ is a circumferential angle (unit: rad) from one end 4a to the other end 4b in the longitudinal direction of the spiral protrusion 4 forming the screw portion 3. In the formula (5), P is the pitch (unit: mm) of the threaded portion 3. Further, in the formula (6), D is the outer diameter (unit: mm) of the metal tube 2, h is the height (unit: mm) of the spiral protrusion 4, t is the wall thickness of the metal tube 2, θo (unit: rad) is the circumferential angle (unit: rad) between one end 15a and the other end 15b of the 1 st ridge portion 15 at the center of the 1 st roller body 12, and r o is the straight line distance from the center of the 1 st roller body 12 to the first peripheral surface 14, that is, the radius (unit: mm) of the 1 st roller body 12.
The pitch Pi of the 2 nd ridge portion 25 is preferably set so as to satisfy the following expression (7) based on the design value of the spiral protrusion 4 (screw portion 3) to be formed, the shape of the 1 st ridge portion 15, and the rotational speeds of the 1 st molding roll 11 and the 2 nd molding roll 21.
Pi＝(θ/θo)·vP……(7)
In the formula (7), θ is a circumferential angle (unit: rad) from one end 4a to the other end 4b in the longitudinal direction of the spiral protrusion 4 forming the screw portion 3.θo (unit: rad) is a circumferential angle (unit: rad) between one end 15a and the other end 15b of the 1 st ridge portion 15 in the 1 st roller body 12. V is the absolute value (|vo/vi|) of the ratio of the rotational speed vo (unit: rad/sec) of the 1 st forming roll 11 to the rotational speed vi (unit: rad/sec) of the 2 nd forming roll 21. P is the pitch (unit: mm) of the threaded portion 3.
As described above, according to the apparatus 1 for manufacturing an oil feed pipe of the present embodiment, the 1 st molding roll 11 is disposed on the outer peripheral surface 2a side of the metal pipe 2, and the 1 st molding roll 11 includes only one 1 st ridge 15 spirally provided with a length smaller than one turn. Therefore, when the metal tube 2 is processed, the one end 15a and the other end 15b of the 1 st ridge 15 in the longitudinal direction do not come into contact with the metal tube 2 at the same time, and thus the raw material of the metal tube 2 is not significantly thinned as in the conventional art. This can prevent the metal pipe 2 from cracking.
In the method for manufacturing the oil feed pipe according to the present embodiment, in the molding step, the screw portion 3 is formed by processing the raw material for forming the metal pipe 2 by one 1 st ridge portion 15 spirally provided in a length of less than one revolution. Accordingly, the strain applied to the threaded portion 3 can be reduced as compared with the conventional method, and the occurrence of cracks can be prevented more reliably.
In particular, in the case where the expanded diameter portion formed by expanding the raw material pipe (for example, from the original diameter to 1.5 times or more) is used as the metal pipe 2 as in the present embodiment, even if the raw material of the expanded diameter portion (metal pipe 2) is work-hardened, the reduction in thickness of the raw material of the metal pipe at the time of forming the screw portion 3 can be reduced, and therefore, occurrence of cracks due to the formation of the screw portion 3 can be prevented.
Description of symbols
1: a manufacturing device of the oil supply pipe; 11: a 1 st forming roller; 12: a 1 st roller body; 13: a 1 st rotation shaft; 14: a first peripheral surface; 15: 1 st raised line; 15a: one end; 15b: the other end; 15c: a top; 21: a 2 nd forming roller; 22: a 2 nd roller body; 23: a 2 nd rotation shaft; 24: a 2 nd peripheral surface; 25: a 2 nd raised line; 25a: a top; 2: a metal tube; 2a: an outer peripheral surface; 2b: an inner peripheral surface; 3: a threaded portion; 4: spiral protrusions; 4a: one end; 4b: the other end; 4c: and a top.
Claims (2)
1. An apparatus for manufacturing an oil feed pipe, in which a 1 st forming roller is disposed on an outer peripheral surface side of a metal pipe, a 2 nd forming roller is disposed on an inner peripheral surface side of the metal pipe, and the metal pipe is roll-formed by the 1 st forming roller and the 2 nd forming roller, thereby forming a screw portion on the metal pipe, the apparatus comprising:
the 1 st molding roll comprises a 1 st rotation axis, a first circumferential surface, and a 1 st raised line spirally arranged on the first circumferential surface along the circumferential direction with a length smaller than one circle; and
the 2 nd molding roll has a 2 nd rotation axis, a 2 nd peripheral surface, and a 2 nd ridge portion spirally provided on the 2 nd peripheral surface along the circumferential direction,
the 1 st rotation axis and the 2 nd rotation axis are arranged in parallel,
the 1 st molding roll and the 2 nd molding roll rotate.
2. In a method for manufacturing an oil feed pipe, in which a 1 st forming roller is disposed on the outer peripheral surface side of a metal pipe, a 2 nd forming roller is disposed on the inner peripheral surface side of the metal pipe, the metal pipe is roll-formed by the 1 st forming roller and the 2 nd forming roller, thereby forming a screw portion on the metal pipe,
as the 1 st molding roll, a 1 st molding roll having a 1 st rotation axis, a first circumferential surface, and a 1 st ridge portion spirally provided on the first circumferential surface along a length smaller than one circumference,
as the 2 nd molding roll, a 2 nd molding roll having a 2 nd rotation shaft, a 2 nd peripheral surface, and a 2 nd ridge portion provided on the 2 nd peripheral surface in a spiral shape along the circumferential direction is used,
the manufacturing method of the oil supply pipe comprises the following steps:
a preparation step of inserting the metal pipe into the 2 nd forming roller and arranging the 1 st rotation axis and the 2 nd rotation axis in parallel with each other; and
and a molding step of forming the screw portion formed of spiral protrusions on the inner peripheral surface of the metal pipe by pressing the raw material for forming the metal pipe between the 2 nd ridge portions through the 1 st ridge portion while rotating the 1 st molding roller and the 2 nd molding roller.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021122632 | 2021-07-27 | ||
| JP2021-122632 | 2021-07-27 | ||
| PCT/JP2022/024910 WO2023007997A1 (en) | 2021-07-27 | 2022-06-22 | Device for manufacturing fuel filler pipe and method for manufacturing fuel filler pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117715711A true CN117715711A (en) | 2024-03-15 |
Family
ID=85086657
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202280050753.6A Pending CN117715711A (en) | 2021-07-27 | 2022-06-22 | Apparatus and method for manufacturing oil supply pipe |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US20240316610A1 (en) |
| JP (1) | JPWO2023007997A1 (en) |
| KR (1) | KR20240024964A (en) |
| CN (1) | CN117715711A (en) |
| CA (1) | CA3225750A1 (en) |
| MX (1) | MX2024000894A (en) |
| WO (1) | WO2023007997A1 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3462427B2 (en) * | 1999-05-27 | 2003-11-05 | 株式会社ベステックスキョーエイ | Screw forming apparatus, screw forming method and oil supply pipe assembly |
-
2022
- 2022-06-22 JP JP2023538334A patent/JPWO2023007997A1/ja active Pending
- 2022-06-22 CN CN202280050753.6A patent/CN117715711A/en active Pending
- 2022-06-22 WO PCT/JP2022/024910 patent/WO2023007997A1/en active Application Filing
- 2022-06-22 CA CA3225750A patent/CA3225750A1/en active Pending
- 2022-06-22 MX MX2024000894A patent/MX2024000894A/en unknown
- 2022-06-22 KR KR1020247002393A patent/KR20240024964A/en unknown
- 2022-06-22 US US18/579,709 patent/US20240316610A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| US20240316610A1 (en) | 2024-09-26 |
| MX2024000894A (en) | 2024-02-06 |
| CA3225750A1 (en) | 2023-02-02 |
| WO2023007997A1 (en) | 2023-02-02 |
| KR20240024964A (en) | 2024-02-26 |
| JPWO2023007997A1 (en) | 2023-02-02 |
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