JP2002001462A - Pipe joint manufacturing method and pipe joint manufacturing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a pipe joint by a press machine only at a minimized processing man-hours and in a simplified operating processes. SOLUTION: A holder 1 is provided with an round cross-sectioned forming hole 5 for forming an outer diameter of a raw pipe 10. Formation of the outer diameter of a pipe joint body portion is performed when the raw pipe 10 is inserted into the inside of the forming hole 5. A first die 2 is a die for forming a mouth end at an end portion 10a of the raw pipe 10 into a squeezed mouth shape and also forming a continuous portion of the mouth end into an enlarged diameter shape. A second die 3 capable of moving and stopping inside the forming hole 5 of the holder 1 forms a mouth end of an another end portion 10b at a curved face while the first die 2 is forming the end portion 10a in an projecting state, and discharges the formed pipe joint from the forming hole 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a pipe joint for producing a cylindrical pipe joint from a metal tube by press working.

[0002]

2. Description of the Related Art Among various types of pipe joints, there is a pipe joint having a characteristic shape adapted to a use state. For example, a metal cylindrical pipe joint, one end of which is formed by a pipe end such as a mouth drawing process or a mouth widening process, and the other end is machined to have a dimensional tolerance of a trunk outer diameter within several tens of microns. In some cases.
In particular, in a pipe joint (refer to FIG. 3) called a nipple because of its similar shape to a nipple, one end portion 12 for connecting a rubber hose or the like has a mouth end 13 with a mouth drawing shape and a mouth end 1
The third continuous portion 14 is formed in an enlarged diameter shape, and the body 15a of the other end portion 15 has a strict tolerance limit dimension for fitting to other parts to reduce a dimensional tolerance. In the conventional manufacturing method of these pipe joints, first, machining is performed by another machine tool in order to keep the outer diameter of the metal tube body within an allowable limit. Next, the body is held from above and below the radius of the tube, taking care not to disturb the dimensions of the body by a press machine, and one end is formed into a predetermined shape by a mold press. Further, the mold is replaced, the pipe joint as the workpiece is turned over, and both ends are replaced. The other end on the processing side is formed by a die press, thereby completing the machining of the target pipe joint. Finally, the pipe joint is subjected to the necessary surface treatment such as galvanization to finish it, thereby completing the product. As can be seen from this manufacturing method, the conventional manufacturing apparatus requires a general-purpose press machine and a machine for dimensioning the outer diameter of a pipe joint.

[0003]

In the conventional method for manufacturing a pipe joint described above, not only the number of processing steps is large, but also a lot of troublesome work such as exchanging a mold and exchanging both ends of a workpiece, and a body part. There is a problem that efficient manufacturing cannot be performed, for example, it is necessary to perform a press work so as not to change the outer diameter dimension. In addition, the manufacturing equipment requires not only a press machine but also a machine to fit the outer diameter within the allowable limit dimensions,
Even if a general-purpose machine tool is used, there is a problem in terms of production equipment and efficiency. SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and has as its object to reduce the number of processing steps as much as possible, to provide a simple work process, and to provide a pipe joint manufacturing method and a manufacturing apparatus which can be manufactured only by a press machine. It is to provide.

[0004]

According to a first aspect of the present invention, there is provided a pipe joint manufacturing method, wherein a body of a metal pipe is held by a holder so that one end of the pipe is projected.
In a pipe joint manufacturing method in which the one end is subjected to press working in a pipe axis direction by a first mold, the one end is formed into a pipe end, and the raw pipe is formed into a pipe joint, the holder comprises a raw pipe. Has a forming hole with a circular cross section for forming the outer diameter of the first die, the first die is a die or a punch for forming one end of the base tube into an arbitrary shape, and the second die is movable in the forming hole of the holder. And can be stopped at an arbitrary position, the outer diameter of the pipe joint body is formed when the raw tube is inserted into the forming hole, and the second die is positioned to position the other end of the raw tube. Stopping and fixing, then forming one end of the protruding state by the first mold, and simultaneously forming the other end by the second mold, forming a pipe joint as a whole, and releasing the first mold At the same time, the second die moves in the molding hole, and the molded pipe joint Discharged from the mold cavity.

According to a second aspect of the present invention, in the pipe joint manufacturing method according to the first aspect, the first mold is a die having a substantially truncated conical recess. By the pressing process, the mouth end of the one end of the base tube is formed into a mouth drawing shape, and a continuous portion of the mouth end is formed into an enlarged diameter shape,
The mouth end of the other end of the raw tube is formed into a curved surface by the second mold that suppresses the pressing operation of the first mold.

According to a third aspect of the present invention, there is provided a pipe joint manufacturing apparatus, wherein one end of a metal pipe is protruded, a holder for holding a body of the pipe, and the one end is pressed in the pipe axis direction. And a first mold for processing one end of the tube end,
In a pipe joint manufacturing apparatus for forming the raw tube into a pipe joint,
The first die has a forming hole having a circular cross section for forming an outer diameter of a raw tube, and performs outer diameter forming of a pipe joint body when inserting the raw tube into the forming hole. A die or punch for molding one end of the base tube into an arbitrary shape, a second die movable in a molding hole of the holder and capable of stopping at an arbitrary position, and The other end is molded at the time of molding with the first mold, and the molded pipe joint is discharged from the molding hole.

According to a fourth aspect of the present invention, in the pipe joint manufacturing apparatus, the first mold is a die having a substantially truncated conical recess. Forming the mouth end of the one end of the base tube into a mouth drawing shape, forming a continuous portion of the mouth end into an enlarged diameter shape, and forming the second die with the mouth end of the other end of the base tube. Into a curved surface.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of a pipe joint manufacturing apparatus according to claim 4 will be described with reference to the drawings, and a first embodiment of a manufacturing method according to claim 2 will be described. This will be described with reference to the operation of the embodiment. FIG. 1 is a schematic configuration diagram of the first embodiment, in which a holder 1, a first mold 2 and a second mold 3 are configured concentrically with a tube axis center 4. As shown in FIG. 3, the pipe joint 11 manufactured here has a metal cylindrical shape, a mouth end 13 of a front end 12 which is one end portion has a mouth drawing shape, and a continuous portion 14 of the mouth end 13 has an enlarged diameter shape. The outer diameter of the body 15a of the rear end 15, which is the other end, is held down to within a tolerance of several tens of microns, and the mouth end 16 is formed into a curved surface. As the material of the raw pipe 10 before processing, various materials suitable for workability and sufficient in strength, such as carbon steel pipe for machine structure (JIS G 3445), are selected and used.

The holder 1 has a forming hole 5 having a circular cross section for forming the outer diameter of the base tube 10. The outer diameter of the molding hole 5 is formed when the raw tube 10 is inserted, so that the dimensional tolerance of the body 15a is set within several tens of microns. Further, the forming hole 5 is not limited to a simple cylindrical hole, and a configuration in which the front end side 5a on the insertion side of the raw tube 10 is tapered may be employed. With this configuration, the operation of inserting and forming the raw tube 10 can be performed smoothly. In this case, the size of the trunk portion 15a can be kept within a sufficient allowable limit size by strictly controlling the hole diameter of the rear end side 5b. The material used for the holder 1 corresponds to a general JIS tool steel, and is, for example, an alloy tool steel (alloy tool steel for cold dies, etc.). The same applies to the following materials such as the first mold 2.

The first die 2 is a die having a substantially truncated cone-shaped depression 6, and one end 10 a of a base tube 10 is formed into a pipe joint 11. The pipe joint 11 after molding is the mouth end 1 shown in FIG.
3 has a mouth drawing shape, and a continuous portion 14 of the mouth end 13 has an enlarged diameter shape.

The second die 3 is movable within the molding hole 5 of the holder 1 and can be stopped at an arbitrary position. In the stopped state of the second mold 3, when the one end 10 a of the projecting tube 10 is formed by the first mold 2, the tube 1
The other end 10b of the zero is stopped and positioned and fixed. at the same time,
The second mold 3 forms the angular end of the base tube 10 into a curved mouth end 16 (see FIG. 3), and discharges the formed pipe joint 11 from the molding hole 5 by moving the second mold 3.

The above-mentioned holder 1, first mold 2 and second mold 3
For other parts configuration, in order to divert the conventional press machine,
The drawings and detailed description are omitted. As the power, a mechanical drive mechanism driven by a motor or a hydraulic drive is used. In addition, when the control system is used alone, manual control is also possible, and automatic control can be performed as one of the machining lines.

Next, a method for manufacturing a pipe joint according to a second aspect will be described by the operation of the first embodiment. First, when the raw tube 10 is temporarily inserted into the forming hole 5 and the first mold 2 is slowly pressed to one end 10a of the raw tube 10, the body 10c is pressed.
Is formed by the forming hole 5, and the target body portion 15a (FIG. 3) of the pipe joint 11 is output by a press machine and is set within a predetermined allowable limit size (see FIG. 2A). At this time, the second die 3 stops the other end portion 10b of the raw tube 10 for positioning, and fixes the raw tube 10 at the time of pressing. Next, the one end 10a protruded by the first mold 2 is formed.
And at the same time, the other end 10b is formed by the second mold 3, and the pipe joint 11 is press-formed as a whole (FIG. 2).
B). Thereby, the process of exchanging the both ends of the tube and the process of exchanging the mold can be omitted. And the first mold 2 is the pipe joint 1
1 and at the same time, the second mold 3 moves in the forming hole 5 and discharges the formed pipe joint 11 from the forming hole 5 (FIG. 2).
C).

Another embodiment of a pipe joint manufacturing apparatus corresponding to claim 3 which is a general concept of claim 4 is the above-described first embodiment.
In the embodiment, one end portion of the pipe joint is subjected to the mouth drawing process. However, other various pipe end portions are formed (plastic working technology series 10).
Tube forming, page 2, Corona, May 1998
This is a pipe joint manufacturing apparatus that performs processing into other shapes. Although illustration is omitted, for example, in the case of flaring processing, the holder 1 is a die and the first die 2 is a punch, and one end of the base tube is formed into various shapes such as bering, flaring, expanding, etc. This is a pipe joint manufacturing apparatus that performs press working to a press working dictionary (160 pages, published by Nikkan Kogyo Shimbun, September 10, 1991).

[0015] Claim 1 is a general concept of claim 2.
In order to cope with the operation of the above-mentioned other embodiment, the pipe joint manufacturing method corresponding to (1) performs various kinds of processing when forming both ends of the raw pipe at the same time from among various types of pipe end forming (the above-mentioned tube forming). This is the pipe joint manufacturing method to be adopted.

[0016]

As described above, according to the pipe joint manufacturing method of the second aspect using the pipe joint manufacturing apparatus of the fourth aspect, the number of processing steps is reduced as much as possible, the operation is simplified, and only the press machine is used. Can manufacture pipe joints. According to the method for manufacturing a pipe joint according to the first aspect using the apparatus for manufacturing a pipe joint according to the third aspect, which is a general concept, it can be widely used for various pipe end processing in addition to the above.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a pipe joint manufacturing apparatus.

FIG. 2 shows a process of a method of manufacturing a pipe joint, wherein A is a cross-sectional explanatory view at the time of inserting a raw pipe, B is a cross-sectional explanatory view at the time of pressing with a first mold and a second mold, and C is after molding. It is sectional explanatory drawing at the time of discharge of the pipe joint of (a).

FIG. 3 is a sectional view of an example of a pipe joint.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Holder 2 1st type 3 2nd type 4 Tube axis center
5 Forming hole 6 Depression 10 Element pipe 11 Pipe joint 12
Front end 13,16 Mouth end 15 Rear end 15a Body 14 Continuity

Claims (4)

[Claims] 1. A body of a metal tube is held by a holder at one end of the tube in a protruding state, and said one end is pressed in a tube axis direction by a first mold. Wherein the holder has a forming hole having a circular cross section for forming an outer diameter of the base tube, and wherein the first mold is formed of a base. A die or punch for forming one end of the tube into an arbitrary shape, wherein the second mold is movable in a molding hole of the holder and can be stopped at an arbitrary position, and when inserting a raw tube into the molding hole The outer diameter of the body of the pipe joint is formed, the second mold is positioned to stop and fix the other end of the raw tube, and then the first mold is used to form one end in a protruding state. The other end is the second
Molded by a mold, a pipe joint is formed as a whole, the second mold is moved in the forming hole at the same time as the first mold is released, and the formed pipe joint is discharged from the forming hole;
A pipe joint manufacturing method characterized by the above-mentioned. 2. The first mold is a die having a substantially truncated cone-shaped depression, and the end of the one end of the raw tube is formed into a mouth drawing shape by a pressing process of the first mold. The continuous end portion is formed into an enlarged diameter shape, and the mouth end of the other end portion of the raw tube is formed into a curved surface by the second die that suppresses the pressing operation of the first die. 2. The method for manufacturing a pipe joint according to item 1. 3. A holder for holding a body portion of a metal tube with one end portion of the metal tube projecting, and press-working the one end portion in a tube axis direction to form the one end portion with a pipe end process. And a first mold for forming the raw tube into a pipe joint, wherein the holder has a forming hole having a circular cross-section for forming the outer diameter of the raw tube, and is provided in the forming hole. Forming the outer diameter of the pipe joint body when inserting the raw tube. The first mold is a die or punch for forming one end of the raw tube into an arbitrary shape, and is movable in a forming hole of the holder. And a second mold that can be stopped at an arbitrary position is provided, and the other end is molded at the time of molding the one end in the protruding state by the first mold, and the formed pipe joint is discharged from the molding hole. A pipe joint manufacturing apparatus characterized by the above-mentioned. 4. The first die is a die having a substantially truncated cone-shaped depression, and by pressing the first die, the mouth end of one end of the raw tube is formed into a mouth drawing shape. 4. The pipe joint manufacturing apparatus according to claim 3, wherein a continuous portion of the end is formed into an enlarged diameter shape, and wherein the second mold forms a mouth end of the other end of the raw pipe into a curved surface. 5.