JPH0871688A - Production of tubular irregular shaped parts - Google Patents

Abstract

PURPOSE: To enhance the reliability of products and yield of materials and to reduce a material cost by subjecting hardly workable materials to warm forging, then to spinning, thereby forming thin parts. CONSTITUTION: Work pieces of prescribed sizes are produced by cutting round rods of work hardening type materials, such as SUS304 and SUH660, precipitation hardening type materials, such as SUS630, and hardly workable materials, such as titanium alloys. These work pieces are subjected to warm forging, by which moldings 5 integrated with the thick parts of products and the parts to be worked by spinning are produced. The moldings 5 are fitted onto a mandrel 2 and are fixed by means of a chuck 4. While the workings are kept rotated, the thin parts are formed by hot or cold spinning using a roller 3 and the surfaces are finished by slight cutting or shot blasting, by which the products are obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a pipe-shaped deformed component such as a beer barrel stopper by spinning a difficult-to-process material.

[0002]

2. Description of the Related Art Work hardening materials such as SUS304 and SUH660, precipitation hardening materials such as SUS630,
Titanium alloys are used for many purposes because they have excellent heat resistance and corrosion resistance and high strength, but they have the drawback of poor workability. Traditionally, to produce products of such materials,
Since cold forging cannot be performed, machined round bar is used for manufacturing, hot forging is used, or pipe-shaped deformed parts with long thin parts such as beer barrel stoppers and filter cases (Fig. 4) It was manufactured by welding a thin-walled pipe to the parts manufactured by hot forging.

[0003]

However, the method of manufacturing by cutting the round bar has the drawback that the amount of shavings is large and the yield of the material is poor, and the material is hard and difficult to grind, and the cost is high. is there. Further, the method of manufacturing by hot forging is cheaper than the manufacturing method of cutting the round bar, but there is oxidation due to heating, and it is necessary to cut the entire surface by 1 to 2 mm. There is a drawback that you cannot do it. Furthermore, in the method of (1), the parts that are hot forged have surface oxidation, and the entire surface must be cut.Because they are welded, there are problems in the corrosion resistance and strength of the welded parts. However, there are problems such as high cost. The present invention uses precipitation hardenable materials, work hardenable materials, difficult-to-process materials such as titanium alloys, and welds without cutting pipe-shaped deformed parts such as beer barrel stoppers and filter cases. The purpose is to provide a method of manufacturing without.

[0004]

In order to achieve the above object, in the present invention, a difficult-to-machine material is cut into a machined piece of a predetermined size, and the machined piece is warm forged to form a thick portion. In addition, the thinned portion is formed by integrally forming the portion to be subjected to the spinning process, and warming or cold spinning the portion to be subjected to the spinning process.

To further explain the above method, in the present invention, a work-hardening material such as SUS304 and SUH660, a precipitation-hardening material such as SUS630, and a round bar of a hard-to-work material such as a titanium alloy are cut. A processed piece of a specified size is formed, and this processed piece is made into a molded product that integrates the thick part of the product and the part to be spun by warm forging, and the part to be spun on this product is warm or cold. Form a thin part by spinning process,
It is to make a product by finishing the surface by slight cutting or shot blasting. Spinning is a common method in which a mandrel (2) is covered with a work piece (1) and rotated, and a roller (3) is pressed, as shown in FIG. The temperature for warm forging and warm spinning varies depending on the material, but is usually room temperature to 600 ° C.
In the case of S630 and SUS304, the temperature is from room temperature to 600 ° C, and in the case of titanium alloy, the temperature is from room temperature to 900 ° C.

[0006]

In the present invention, it is not necessary to raise the temperature as in hot forging as in the case of hot forging in order to form a molded product in which the thick portion and the portion to be subjected to spinning are integrally formed by warm forging. Is not thickened, the thickness to be removed by cutting may be about 0.5 mm, which is less than 1-2 mm for hot forging. Also, warm or cold spinning is performed by a work hardening material such as SUS304 or SUH660, a precipitation hardening material such as SUS630, or SUS3.
No. 04, SUH660, and hard-to-process materials such as titanium alloy can be thinly machined, and the thinned part can be machined long.

[0007]

Embodiments of the present invention will be described below. Example 1 A method for manufacturing a beer barrel stopper will be described with reference to FIGS. 2 and 3. As a material, C: 0.015%, Si = 0.2
7%, Mn = 0.68%, P = 0.033%, S = 0.
002%, Cu = 0.39%, Cr = 18.44%, N
A rectangular 32 mm round bar of i = 10.05% SUS304 was cut, a processed piece having a thickness of 41.2 mm was manufactured, and this was warm forged at 300 ° C. to manufacture a molded product (5). The inner diameter of this molded product (5) is 30 mm, the outer diameter of the portion (51) is 60 mm, the width is 10 mm, and the wall thickness of the portion (52) is 7.5 m.
m and length 20 mm. This molded product (5) is heated to 200 ° C.
Heated to fit on a mandrel (3), fixed with a chuck (4), rotated at 200 rpm and warm-spun using a roller (3) with an outer diameter of 120 mm, as shown in FIG. Thus, a beer barrel stopper (6) having a total length of 55 mm, a thin wall thickness of 2 mm and a length of 30 mm was produced.

Example 2 The same molded article (5) as in Example 1 was used, and this was subjected to cold spinning without heating to produce a beer barrel stopper (6) shown in FIG. Spinning took a long time, but it was possible to produce a product similar to the one that was warm-spun.

The present invention is not limited to the embodiments in other points than the above, and it goes without saying that various modifications can be made without departing from the spirit of the invention.

[0010]

EFFECTS OF THE INVENTION The present invention having the above-mentioned structure has the following excellent effects. (1) According to the present invention, it is possible for the first time to process a hard-to-process material such as a work-hardenable material, a precipitation hardenable material, and a titanium alloy into a thin wall, and to lengthen the thin walled portion. (2) Since the thin portion can be manufactured without connecting by welding, the reliability of the product is high. (3) In the present invention, since there is no portion to be cut, the material yield is high and the material cost is low.

[Brief description of drawings]

FIG. 1 is an explanatory diagram illustrating a spinning process of the present invention.

FIG. 2 is an explanatory view illustrating a method of manufacturing a beer barrel stopper by the method of the present invention.

FIG. 3 is a cross-sectional view of a beer barrel stopper manufactured by the method of the present invention.

FIG. 4 is a cross-sectional view of a pipe-shaped deformed part manufactured by a conventional method.

[Explanation of symbols]

 1 Workpiece 2 Mandrel 3 Roller 4 Chuck 5 Molded product 6 Beer barrel stopper

Claims (1)

[Claims] 1. A hard-to-work material is cut into a work piece of a predetermined size, and the work piece is warm forged to form a thick-walled portion and a portion to be processed by spinning, which is a molded article. 2. A method for producing a pipe-shaped deformed part, characterized in that a thin-walled part is formed by performing a warm or cold spinning process on a part to be spin-processed.