JPH0810892A - Formation of cylindrical body with inner flange - Google Patents

Abstract

PURPOSE:To manufacture a cylindrical body with inner flange such as an I-joint with good productivity. CONSTITUTION:The cylindrical body C with the inner flange having the inner flange parts at both ends thereof is formed from a metal-made thick cylindrical blank A by forging. Inner flange inner diameter regulating columnar parts 21 of a movable and a fixed punch 15, 17 are inserted to the both ends of the thick cylindrical blank A. A cylindrical body outer diameter regulating ring 19 is arranged outside the thin cylindrical blank A in the peripheral direction and the thick cylindrical blank A is subjected to compression and buckle- deformation (swaging).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a tubular body with an inner collar having, at both ends, an inner collar portion having substantially the same wall thickness as the tubular body by cold forging from a metallic thick tubular material. Regarding

In particular, it is a suitable method for molding a tubular body with an inner collar as a semi-finished product of an eye joint for fluid coupling.

Here, a case of manufacturing the eyeball member of the eye joint for a fluid coupling in the case of connecting the main fuel pipe and the fuel filter will be described as an example, but other types of eye joints and further other metals are used. The same applies when manufacturing a product.

[0004]

2. Description of the Related Art The eyeball member of the above eye joint has been manufactured, for example, by the steps shown in FIG.

That is, a shaving bar with a vertical hole 1 drilled by cutting was cut (A), and then a horizontal hole 3 was drilled (B).
After that, the inner peripheral expanded portion 5 is inward through the horizontal hole 3 or the vertical hole 1.
Was formed, and finally, finishing processing was performed to manufacture (C).

[0006]

However, in the case of manufacturing by this conventional method, it is necessary to cut from the steel bar by cutting the inner surface of the radially enlarged portion of the inner circumference through the lateral hole, so that a large amount of cutting waste is generated. However, it was difficult to discharge the cutting chips, the processing time was long, and the productivity was not good.

Further, the inner peripheral enlarged diameter portion of the above-mentioned eye joint serves as a passage for the fluid, and except for the flow path area, each precision of the shape and the finished surface is not required so much, and it is inevitable to be formed by cutting. There is no.

In view of the above, it is an object of the present invention to manufacture an inner jointed cylinder with good productivity such as an eye joint with good productivity.

Another object of the present invention is to provide a method capable of producing eyeball members of an eye joint with good productivity.

[0010]

[Means for Solving the Problems]

(1) The method for molding a tubular body with an inner collar according to claim 1 of the present invention solves the above problems by the following configurations.

A method for forming, by cold forging, a tubular body with an inner collar having, at both ends, an inner collar portion having substantially the same thickness as the tubular body from a thick tubular material made of metal. Compress the thick-walled tubular material by inserting the inner flange regulating pillars of the movable and fixed punches at both ends of the material, and by arranging the barrel main body outer diameter regulating ring outward in the circumferential direction of the thick-walled tubular material. -Characterized by performing buckling deformation (swazing).

(2) The method for manufacturing an eye joint according to claim 4 of the present invention solves the above problems by the following constitution.

The inner collared cylindrical body molded according to claim 1 is subjected to side surface drilling and finishing by cutting to manufacture an eye joint eyepiece member for a fluid coupling.

[0014]

Embodiments of the present invention will now be described with reference to the drawings. Here, the case of forming using a vertical cold forging device in which the lower die punch is on the fixed side will be described as an example, but the present invention is not limited to this. That is, it is also possible to use a fixed side of the upper die punch or a horizontal type cold forging device.

(1) The schematic construction of the forging device used in the method for forming the tubular body C with the inner collar is as shown in FIG.

A pair of upper and lower dies 11 and 13, and upper (movable) and lower (fixed) punches 15, which are integrally movably fitted to the upper (movable) and lower (fixed) dies 11 and 13, 17 and a cylindrical body outer diameter restriction ring 19 arranged between the upper and lower dies 11 and 13. And the upper and lower punches 15, 17
Are provided with inner flange inner diameter regulating column portions 21 respectively facing the tip. A ram (not shown) is connected to the upper die 11 and the upper punch 15 so that the workpiece can be pressed from above.

(2) The inner flanged cylinder C is molded as follows using the forging device having the above-mentioned basic structure (see FIG. 2). Here, it is premised that an inner flanged cylinder C having inner flanges at both ends is formed by cold forging (mainly swaging) from a thick metal tubular material (workpiece) A made of metal.

Upper and lower punches 1 on both ends of the thick-walled tubular material A
The inner flange inner diameter regulating column portion 21 of each of 5 and 17 is inserted. Specifically, the cylindrical material A can be set on the inner flange inner diameter regulating column portion 21 of the lower punch 17 by separating the upper and lower dies 11 and 13 from each other by separating the dies from each other. After being set on the inner diameter regulating column portion 21, the upper die 11 is lowered to be brought close to the lower die 13. Then, the inner diameter regulating column portion 21 of the upper punch 15 is fitted to the upper end of the tubular material A (FIG. 2-
I).

Further, by lowering the upper die 11,
When the distance between the lower dies 11 and 13 is shortened, the outer peripheral surface of the material projects (buckles and deforms) outward, but the outer diameter is restricted by the cylindrical outer diameter restriction ring 19 (Fig. 2-II).

When the compression / buckling deformation (swaging) is finally completed, the inside of the overhanging portion is the inner peripheral enlarged diameter portion 5
Therefore, the inner flange f is relatively formed around the inner diameter regulating column portion 21.
Will be formed (Fig. 2-III).

(3) As the thick-walled tubular material A, a thick-walled pipe (for example, STKM material) cut may be used, but a tubular body molded by the method of FIG. 3 may be used.

It is obtained from the cut bar-shaped material 13 through each of forging processes of forward extrusion or backward extrusion and piercing (punching). More specifically, cutting (i) → swaging (ii) →
It is obtained through each die forging process of straightening (iii) → forward (or backward) extrusion (iv) → punching (v). That is, it can be formed by an automatic cold forging machine (part former).

(4) The cylindrical body C with the inner flange is only subjected to finishing by passing through side holes by cutting.
It is possible to manufacture the eyeball eye member E of the eye joint having the vertical hole 1, the horizontal hole 3, and the inner peripheral enlarged diameter portion 5 (Fig. 2-I).
V).

[0024]

[Operation and effect of the invention]

(1) In the method for forming a tubular body with an inner collar according to the first aspect of the present invention, as described above, a thick tubular material can be formed by cold forging. Like the eye joint's centerpiece, the inner diameter expansion part, which does not require high precision in shape and finish, forging process instead of cutting process that generates a large amount of cutting scraps and takes a long processing time and is difficult to discharge cutting scraps. Can be formed, and the product can be manufactured with good productivity.

Further, when the cut bar steel is formed from a cylindrical material by cold forging as in claim 2, it can be formed in the same cold automatic machine (part former), which contributes to improvement in productivity. .

As a processing method for expanding the diameter of the pipe material at the central portion, there is a bulge processing method utilizing rubber or liquid pressure (see Japanese Utility Model Publication No. 61-23995), but the inner collar which is the object of the present invention. The attached cylinder C cannot be applied to the cold forging process which is thick and does not use a substance for transmitting pressure such as rubber or liquid for increasing the internal pressure.

[Brief description of drawings]

FIG. 1 is a process chart showing an example of a method for manufacturing a conventional eye joint eyeball member.

FIG. 2 is a process drawing showing an example of a method for forming a tubular body with an inner collar according to the present invention.

FIG. 3 is a process drawing showing an example of a case where a tubular material used for forming a tubular body with an inner collar of the present invention is obtained by cold forging.

[Explanation of symbols]

 11 Upper (Movable) Die 13 Lower (Fixed) Die 15 Upper (Movable) Punch 17 Lower (Fixed) Punch 19 Tubular Body Outer Diameter Control Ring 21 Inner Collar Inner Diameter Regulating Column A Thick Cylindrical Material C Inner Collar Cylinder E Eye joint eyepiece

Claims (4)

[Claims] 1. A method for forming a tubular body with an inner flange having inner flange portions at both ends by cold forging from a thick metal tubular material made of metal, wherein the tubular material is movable at both ends of the thick tubular material.・ Insert each inner flange inner diameter regulating column of the fixed punch, and arrange the outer diameter regulating ring of the cylinder body outside the thick cylindrical material in the circumferential direction to compress and buckle the thick cylindrical material. A method for forming a tubular body with an inner flange, which is performed by deforming (swazing). 2. The thick-walled tubular material according to claim 1,
A method for forming a tubular body with an inner flange, which is obtained by subjecting a cut rod-shaped material to each of forging processes of forward extrusion or backward extrusion and piercing (punching). 3. The thick-walled tubular material according to claim 1,
A method for forming a tubular body with an inner flange, which is a thick pipe material that has been cut. 4. A manufacture of an eye joint, characterized in that the cylindrical member with an inner collar formed according to claim 1 is subjected to side surface drilling and finishing by cutting to manufacture a center member of an eye joint for a fluid coupling. Method.