JPH0357528A - Manufacture of mouth piece for gas welding and its apparatus - Google Patents

Abstract

PURPOSE:To completely integrate a mouth piece for gas welding by drawing a hollow tube part of an integrated member where a mouth piece material and a nozzle material which are worked and formed separately are engaged with each other, reducing its diameter and working it plastically. CONSTITUTION:A blank C obtained by fitting the mouth piece material A with the nozzle material is supplied to a heading stage of a heading device and pressed into a die enclosed and restrained by a punch 11 and a die 12. At this time, a guide pin 13 projecting from the side of the side is penetrated into the hollow hole 3 of a short tube nozzle material B and the hollow tube part 1 of the mouth piece material A is extruded forward with the short tube nozzle material B according to the guide pin 13, reduced in diameter and drawn in the axial direction. In this way, a large diameter base part 1a and a small diameter nozzle part 1b drawn in a fine axis in the front part of the large diameter base part 1a can be press-formed integrally.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing a gas welding cap in which two members are joined together and formed by a forging means, and a product thereof.

[Prior Art] As shown in FIG. 5, a gas welding cap consists of a single cap material A consisting of a small hollow protrusion 2 concentrically protruding from one end of a hollow cylindrical portion 1, and a nozzle core tube. It is constructed by fitting the short tube-shaped nozzle material B, but conventionally, the mouthpiece material A and the nozzle material B were formed separately, and then they were combined as they were and joined together by welding. Or, after fitting, the tip of the cap material A is caulked and integrated.

[Problems to be Solved by the Invention] According to such a conventional method, the cap material and the nozzle material are made by cutting and then joined together, but when they are joined together by welding, there is a problem in the manufacturing process. There is a problem that it is time-consuming and expensive, and when the tip of the cap material is fixed by caulking after joining, the accuracy of the caulked part is not guaranteed, and as a result, gas leakage and gas pressure may cause caulking. There were problems such as parts loosening and the nozzle material falling out.

The present invention has been made in view of the above-mentioned problems of the conventional technology, and its purpose is to easily forge objects made by cutting by plastic working using a former. The purpose of the present invention is to provide a method and a product for strongly and reliably manufacturing a gas welding cap and forging the cap material and nozzle material at the same time as forging without using conventional welding or caulking.

[Means for Solving the Problems 1] In order to achieve the above object, the method for manufacturing a gas welding cap according to the present invention includes a hollow cylindrical part made by metal cutting or forging, and a concentrically integral part at one end thereof. A short tube-shaped nozzle material, which serves as a nozzle core tube, is fitted onto a piece of nozzle material consisting of a protruding hollow small protrusion so that the nozzle tip faces the tip opening of the hollow cylindrical portion. A method for manufacturing a gas welding cap, the step of forcibly fitting the separately processed cap material and short tube-shaped nozzle material into the hollow cylindrical portion of the cap material by pushing the short tube nozzle material into the hollow cylindrical portion of the cap material. The blank fitted with the two is supplied to the forging process and upturned into a mold that is sealed tightly with punches and dies, and when upsetting the blank, the hollow hole in the short tube nozzle material is A guide pin protruding from the die side or punch side is inserted into the hole, and using the guide pin as a guide, the hollow cylindrical part of the mouthpiece material is squeezed forward with the short tube nozzle material inside, and the shaft is reduced in diameter. By performing a step of stretching in the same direction, a small diameter nozzle part with a narrow axis is integrally formed by forging on the front part of a large diameter base part.

The gas welding cap as the above-mentioned product consists of a hollow cylindrical part and a small hollow protrusion concentrically protruding from one end of the hollow cylindrical part.
A short tube-shaped nozzle material, which serves as a nozzle core tube, is fitted into the nozzle material so that the tip of the nozzle faces the tip opening of the hollow tube. It is preferable that the tube is formed by forward extrusion together with a short tube-shaped nozzle material fitted therein to reduce the diameter, and then to be formed into a pressed shape so that the tube is stretched into a thin shaft and integrated.

[Function] When the mouthpiece 'vI8 and the nozzle material B are processed and formed separately and fitted together, a blank C as shown in FIG. 4 is obtained. When this blank C is supplied to the forging process of the former, forced into the forging process by the bunch 11, and upset into the mold 5 of the die 12, the blank C is inserted into the hollow hole 3 of the nozzle material B into the die mold as shown in FIG. A guide pin 13 fixedly provided at the bottom of the hole is inserted through the hole, and in this state, it is squeezed forward. Therefore, the hollow cylinder part 1 of the nozzle material B is stretched in the axial direction while the diameter of the hollow cylinder part 1 of the mouthpiece material A is reduced from the tip side while the hole diameter of the hollow hole 3 is maintained constant. The short tube-shaped nozzle material B is also squeezed together through the wall thickness of the hollow cylinder part 1, so the hole diameter remains constant and the length of the short tube is extended in the front-rear direction, making it completely integrated with the hollow cylinder part 1. It becomes what is given. This squeezing is performed over approximately half to one-third of the length of the hollow cylindrical portion 1. Then, a large-diameter base 1a having a small hollow protrusion 2 at the rear end and a small-diameter nozzle part 1b protruding in front with a thin shaft are integrally forged. When the screw 2a is machined, a product (gas welding cap) D as shown in FIG. 5 is obtained.

[Example] This example shows a case in which a die material A and a nozzle material B are each subjected to six heading processes in four to six steps using a transformer.

First, the cap material A is obtained by cutting a diagonal wire material into a certain size as shown in Fig. 2 to obtain the material A1 (Fig. 2 a), and sending it to the first stage to straighten the end face with punches and dies. A preform A2 is obtained having a conically tapered surface b at one end (Fig. 2 b
). When this is narrowed down in the third stage, it becomes a molded product A3 having a small protrusion C with a thin shaft (Fig. 2C), and in the following 4 to 6 steps, a blind hole d is formed at the end. Molded products A4 to A6 having stepped blind holes "e" and "stepped blind holes" are obtained (Fig. 2 d, e, f).Finally, when holes are punched out in the viasing step, holes Q are formed through the front and rear holes. The cap material A is pressed and formed (Q in FIG. 2).

Similarly, for nozzle material B, material B1 is obtained by cutting a zero wire material to a certain size (Fig. 3a), and when it is straightened in the first stage, it has a conical taper surface b' at one end and a depression b at the other end. '' is obtained (Fig. 3b), and when this is further subjected to the necessary plastic working in the second and third stages of forging,
As shown in Figure (d), a pre-shaped product B4 having a deep recessed hole d at the tip and a shallow depression d' at the other end is obtained, so if the hole is punched in the fourth step, Figure 3 A short tube B5 having a hollow hole 3 is obtained as shown in FIG. When this is further sent to the next step and the tip is processed, a hollow short tube-shaped nozzle shank B having an annular step 4 at the tip is obtained (FIG. 3f).

The cap material A is made of Cu or a copper alloy, and the nozzle material B fitted therein is made of a different metal, such as CrCu (chromium copper).

When fitting the nozzle material B into the hollow cylindrical portion 1 of the spout material A, a gap 7 is created between the nozzle material B and the shoulder 6 of the second step so that the rear end is received by the step shoulder 5 of the hole q. I'll keep it. In this way, when the hollow cylindrical portion 1 and the nozzle material B are squeezed out together, the excess material wraps around and fills the gap 7, making it possible to more effectively integrate them.

Similarly, the extra material due to the narrowing of the hollow cylinder part 1 goes around the annular step part 4 at the tip of the nozzle material B and fills the annular gap. The loosely tightened state completely prevents the nozzle material from slipping out.

The bandage 11 advances and the blank C is placed in the mold of the die 12.
When the punch 11 is upset and a predetermined plastic working is performed, the knockout pin 14 protrudes from the die 12 side after the punch 11 retreats, thereby extruding the pressed product D from the inside of the mold.

Note that the guide pin 13 is connected to the die 1 as shown in FIG.
Although it is provided on the second side, it can also be provided on the punch side.

When the guide pin 13 is provided on the punch 11 side, it is preferable to install a guide pin made of a similar thin shaft so as to protrude concentrically from the tip of the punch core 11b of the punch outer cylinder 11a.

When the blank C is placed in a die mold and plastically worked into a predetermined shape and size, a nut shape having a polygonal surface 1C such as a hexagonal surface can be formed in a portion that will become the large diameter base portion 1a.

When the cap material A and the nozzle material B are formed by continuous multi-stage plastic processing using a heading machine, they are formed separately using two machines, and then the last two processes of one machine are used. Finally, the fitted blanks C are fed into a heading section and formed into a predetermined shape, or the two members A. B are fitted together using a special machine and then supplied to the forging section. Also, using one composite multi-stage heading machine, two parts A can be produced simultaneously from the left and right sides.
．． It is also possible to mold B, fit them together at the center, and plastically process them at the same time.

[Effects of the Invention] Since the present invention is constructed as described above, it produces the effects described below.

■ Compared to the conventional manufacturing method of gas welding caps, in which the cap material and nozzle material are shaped separately by cutting, etc., and then fitted as is and then welded, or are joined together by caulking etc. in a separate process, The hollow cylindrical part of the cap material is squeezed out together with the internal nozzle material through heading processing, and plastic processing is performed to achieve complete integration. There is no need to worry about time and effort, and the connection is incomplete, so there is no need to worry about it coming off.

10 ■ When squeezing out the hollow cylindrical part of the nozzle material by forward extrusion, the guide pin is inserted into the hollow hole of the nozzle material, so the hole diameter of the nozzle is kept constant and only the outer diameter is plastically deformed. The specified shape and dimensions can be obtained by rolling in the excess material, resulting in high processing accuracy, high quality as a gas welding nozzle, no problems such as gas leakage or falling off, and a product with excellent safety. It can be obtained cheaply.

■ It can be easily and quickly mass-produced using a multi-stage former, and is advantageous in terms of cost because mass production can be achieved and there is little material loss.

[Brief explanation of drawings]

The drawings show an embodiment of the method for manufacturing a gas welding cap and its product according to the present invention, and FIG. 1 is a cross-sectional plan view of the forging device, and FIGS. 2 (a) to (g) show the forging process of the cap material. In the plan view showing the order, the right half of each is shown in cross section. FIG. 3 is a plan view showing the heading process order of the nozzle material, and the right half of each is shown in cross section. FIG. 4 is a plan view of a blank obtained by fitting the nozzle material to the nozzle material, and the right half is shown in cross section. FIG. 5 is a plan view of a product obtained by the method of the present invention, with the lower half shown in cross section. 1...Hollow cylindrical part 3...Hollow hole 1b...Nozzle part B...Nozzle material D...Product 2...Small protrusion 1a...Base A...Base material C... ··blank? Patent applicant Sakamura Machinery Co., Ltd.

Claims (2)

[Claims] (1) A hollow cylindrical portion 1 made by metal cutting or forging and a small hollow protrusion 2 concentrically protruding from one end of the hollow cylindrical portion 1
Manufacture of a gas welding cap configured by fitting a short tube-shaped nozzle material B, which becomes a nozzle core tube, to a single cap material A consisting of In this method, the separately processed cap material A and the short tube-shaped nozzle material B are forced into the hollow cylindrical portion 1 of the cap material A so that the short tube nozzle material B is held therein. The blank C fitted together with the blank C is supplied to the forging process and punched 1.
1 and die 12 into a mold that is hermetically sealed;
When upsetting the blank, a guide pin 13 protruding from the die side or the punch side is inserted into the hollow hole 3 of the short tube nozzle material B, and the hollow cylindrical portion of the mouthpiece material A is guided by the guide pin 13. 1 together with the short tube nozzle material B therein, and simultaneously performs the process of reducing the diameter and stretching it in the axial direction, so that it is squeezed into a fine axial shape at the front part of the large diameter base 1a. A method for producing a gas welding cap, which comprises integrally forging a small-diameter nozzle portion 1b. (2) One base material A consisting of a hollow cylindrical part 1 and a small hollow protrusion 2 concentrically protruding from one end thereof, and a nozzle core so that the nozzle tip faces the tip opening of the hollow cylindrical part 1. It is configured by fitting a short tube-shaped nozzle material B that becomes a pipe, and the mouthpiece material A
The hollow cylindrical portion 1 is squeezed out together with the short tube-shaped nozzle material B fitted therein by forward extrusion to reduce the diameter, and the hollow cylindrical portion 1 is stretched to have a thin shaft and pressed to be integrated. Gas welding cap.