JPH0771675A - Manufacture of i-shaped joint - Google Patents

Abstract

PURPOSE:To facilitate manufacturing an I-shaped joint, having a head part use part provided with a curved peripheral surface and a pipe part use part protruded to the sideward, by placing an element pipe, cut into a short cylinder shape, in a bulge use metal mold, and performing bulge working by charging the inside of the element pipe with elastic unit or liquid. CONSTITUTION:In the case of manufacturing an I-shaped joint, an element pipe (a) cut into a short cylinder shape, in a curved internal peripheral surface 5 of internal diameter almost equal to an external diameter of a head part of the I-shaped joint, is engaged in bulge use metal molds 2, 3 having a head part use hole part 4 provided with each opening part 6, 7 in the center line axial direction and having a pipe part use hole part 8 to the sideward from the hole part 14. In a condition of charging the inside of the element pipe (a) with a pressurizing material 9 of elastic unit or liquid, both side end faces 12 of the element pipe (a) are pressurized by punches 10, 11 from each opening part 6, 7 of the metal mold 2, 3, to form a bulge molded product 14 of molding a head part use part 15 and a pipe part use part 16. Thereafter, the pipe part use part 16 is drilled and also further drawn out by burring work, to obtain a product by performing required finish cutting.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an eye-shaped joint, that is, a head portion having an eye shape, and a pipe portion protruding from a part of the head portion to the inside of the head portion. The present invention relates to a method for manufacturing a fluid supply / drain joint having a through hole formed therein.

[0002]

2. Description of the Related Art An eye-shaped joint is used, for example, for supplying and discharging fluid such as fuel and oil in automobiles at a connecting portion between a tank portion and a pipe, and its shape is generally shown in FIGS. Is shown in. Figure 7 shows its usage
As shown in FIG. 3, the eye-shaped head 1 of the eye-shaped joint is inserted into the screw hole 22 formed in the tank portion 20 with the sealing material 23 interposed therebetween.
Is mounted, and the tightening bolt 24 having the through hole 25 from the side portion to the tip portion is screwed into the screw hole 22 of the tank portion 21 via the head portion 1. On the other hand, by connecting the pipe 26 to the pipe portion 13 protruding toward the side of the head 1, the tank portion 21 and the pipe 26 are connected in a communicating state.

To manufacture this eye-shaped joint,
1) A method of cutting and finishing after forming by casting, and 2) a method of cutting and finishing after forming by cold forging are generally considered. However, what is formed by the casting of 1) above is
Nests are easily generated inside and it is difficult to cut. In addition, the cost of the product formed by the cold forging of 2) is high.

Then, a method developed by cutting from a flat metal plate material was developed. In this manufacturing method, for example, a flat metal strip having a thickness of 15 mm, a width of 28 mm, and a length of 4 m is cut into an outer shape having a head portion and a pipe portion, and an eye-shaped hole is formed in the head portion. Also, each through hole is formed in the pipe part, then the inner peripheral surface of the eye-shaped hole is cut into a curved shape, and after deburring the through hole of the pipe part, both end faces of the head are cut. In addition, a step portion is formed in the through hole of the pipe portion.

[0005]

However, in the method of manufacturing by cutting from the above metal flat plate material, there are very many parts to be cut and removed, and the weight ratio of the product to the material is about one-third. The material cost is very uneconomical.
Further, since the above cutting requires several kinds of single-purpose machines, special-purpose machines, automatic machines, etc., the processing cost is high and the production efficiency cannot be said to be high.

Therefore, in this manufacturing method, in order to reduce the material cost and the processing cost, various improvements have been made to the machine until now, but it has reached the limit.
However, processing manufacturers are in the current situation where further cost reduction is required.

The present invention reexamines the conventional method for manufacturing the above-mentioned eye-shaped joint, reduces the material cost by eliminating the waste of the material and reduces the machining cost by minimizing the machining process while having a simple structure. In addition, it is an object of the present invention to provide a method for manufacturing an eye-shaped joint, which can improve the production efficiency and also reduce the cost in that respect.

[0008]

A method for manufacturing an eye-shaped joint A according to the present invention is a method in which a raw pipe a cut into a short cylindrical shape (see FIG. 1) is used as an outer diameter d of a head 1 of the eye-shaped joint. On the curved inner peripheral surface 5 having substantially the same inner diameter, a head hole portion 4 having openings 6 and 7 in the center line X direction of the head portion 1 and a pipe portion hole portion laterally from the hole portion 4 are formed. Bulge mold with 8 and 2,
3 (see FIG. 2),

In a state where the material pipe 1 is filled with an elastic body or a liquid pressurizing material 9, punches 10 and 11 from the openings 6 and 7 of the bulge molds 2 and 3 are used to form the material pipe a. Both end surfaces 12, 12 and the pressurizing material 9 are pressed (see FIG. 3) to form a bulge molded product 14 in which the head portion 15 and the pipe portion 16 are bulged (see FIG. 4).

Portion 16 for pipe portion of bulge molded product 14
Is further pierced and further drawn by burring (see FIG. 5), and thereafter, the curved inner peripheral portion 17 and both side end portions 18, 18 of the head portion 15 and the hole portion 19 of the pipe portion 16 are formed. Are finished by cutting (see FIG. 6).

In the above structure, the material of the shell a is, for example, iron, stainless steel or the like. In the figure, 13 is a pipe part, 20 is a curved outer peripheral surface of the head 1, 21 is a tank part,
22 is a screw hole, 23 is a sealing material, 24 is a tightening bolt,
Reference numeral 25 is a through hole, and 26 is a pipe.

[0012]

In the method of manufacturing the eye-shaped joint A according to the present invention described above, the tube a cut into a short cylindrical shape is used as the bulge mold 2,
Bulge processing is carried out in a state in which the material pipe 3 is engaged and the material 9a is filled with an elastic body or a liquid pressurizing material 9.

The bulge molds 2 and 3 have a head hole portion 4 having a curved inner peripheral surface 5 having an inner diameter substantially equal to the outer diameter d of the head portion 1 of the eye-shaped joint, and a side portion from the hole portion 4. And a hole 8 for a pipe portion to the. Therefore, by this bulging, a thick head portion 15 having a curved outer peripheral surface 20 and a pipe portion portion 16 protruding laterally from the head portion 15 are immediately formed from the short cylindrical raw pipe a. A bulge molded product 14 having

In the above case, since the steps up to this point are formed only by the bulging process, the process is extremely simplified. Further, since all of the raw pipe a is the bulge molded product 14 as it is, there is no waste of material cost. Moreover, since the head portion 15 is formed thicker toward both end portions, which is a characteristic of bulging (see FIGS. 3 and 4), it has a shape suitable for an eye-shaped joint.

Thereafter, the pipe portion 16 of the bulge molded product 14 is formed with a hole 19 by piercing and further drawn by burring, and the curved inner circumference of the head portion 15 is almost the same as in the conventional case. The surface 17 and the side edges 18, 18,
The holes 19 of the pipe portion 16 are finished by cutting. Therefore, the whole process is simple and the equipment is also simplified.

[0016]

EXAMPLE A case of manufacturing an eye-shaped joint A whose material is iron, for example, the head 1 has an outer diameter d28 mm, the height h is 14 mm, and the length of the pipe 13 is about 10 mm will be described.

First, a short-cylindrical tube a is prepared. As the raw pipe a, an iron pipe having a thickness of about 3 to 4 mm is cut into a short cylindrical shape having a length of about 25 to 30 mm (see FIG. 1).

The short cylindrical tube a is attached to the bulge mold 2,
3 into engagement. The bulge molds 2, 3 are curved inner peripheral surfaces 5 having an inner diameter substantially equal to the outer diameter d of the head 1 of the completed eye-shaped joint, and the openings 6, 6 are formed in the center line x direction of the head 1. A head hole 4 having a hole 7 and a pipe hole 8 extending laterally from the hole 4 is used. The bulge dies 2 and 3 may be of a two-division type in the horizontal direction (see FIG. 3), but may be a two-division type or a three-division type in the vertical direction.

Next, in a state where, for example, rubber 9 is filled in the raw tube a as a pressurizing material, the punches 10 and 11 are press-fitted through both openings 6 and 7 of the bulge molds 2 and 3, Both ends 12 and 12 of the raw pipe a and the rubber 9 are pressed to bulge.

The rubber 9 as the pressurizing material may be engaged in the bulge molds 2 and 3 in a state of being pre-filled in the raw tube a (see FIG. 2), but in the case of automation. The rubber 9 is attached to the tip of one of the punches 10, and when the punches 10 and 11 are engaged with the raw pipe a into the molds 2 and 3, when the rubber 9 is pressed simultaneously with the raw pipe a. It may be filled in and bulged.

The short cylindrical blank a is formed by the bulge molding described above and has a curved outer peripheral surface 20 in the head hole portion 4 and a thick head portion 15 and a side portion in the pipe portion hole 8. A bulge molded product 14 having a pipe portion portion 16 projecting inward (see FIG. 4). At this time, the head portion 15 becomes thicker toward the both end portions 18, 18, which is a characteristic of bulging, and has a shape suitable for an eye-shaped joint.

Thereafter, the pipe portion 16 of the bulge molded product 14 is formed with a hole 19 by drilling, and
After pulling it out further by burring, the head part 15
The curved inner peripheral portion 17 and both side end portions 18, 18 and the hole portion 19 of the pipe portion 16 are respectively finished by cutting (see FIGS. 6 and 8).

[0023]

As is apparent from the above, the method of manufacturing an eye-shaped joint according to the present invention has a simple structure, can reduce material cost by eliminating waste of material, and can reduce cutting work to the minimum necessary. The cost can be reduced, and the production efficiency can be improved to reduce the cost.

That is, in the conventional method for manufacturing an eye-shaped joint, there are a method of cutting and finishing after forming by casting, a method of cutting and finishing after forming by cold forging, and a method of manufacturing by cutting from a flat metal plate material. there were. However, it is difficult to generate cavities and cutting, the processing cost is high, and there are many parts to be cut and removed, and the material cost is high.
Production efficiency was low due to the need for several types of single-purpose machines, specialized machines, automatic machines, etc.

On the other hand, in the method of manufacturing the eye-shaped joint according to the present invention, the raw tube cut into the short cylindrical shape as described above is engaged in the bulge die, and the elastic body or the liquid is placed in the raw tube. Bulge processing is performed in a filled state to form a bulge molded product having a thick head portion having a curved outer peripheral surface and a pipe portion portion protruding laterally.

Therefore, the main part of manufacturing the eye-shaped joint can be performed only by the bulging process, so that the manufacturing process can be extremely simplified. Also, since all of the raw tubes are bulge molded products as they are,
The waste of material costs can be completely eliminated. Moreover, since the head part there is formed to be thicker toward both side ends, which is a feature of bulge processing, it is formed into a shape suitable for an eye-shaped joint, and after that, just by cutting and finishing, the eye-shaped joint is formed. Can be manufactured.

[Brief description of drawings]

FIG. 1 is a partially longitudinal front view of a shell used in a method for manufacturing an eye joint according to the present invention.

FIG. 2 is a vertical sectional front view showing a state immediately before pressurizing with a punch by engaging the raw tube shown in FIG. 1 in a bulge mold.

3 is a vertical cross-sectional front view of a state immediately after bulging by pressurizing a pressurizing material with a punch after the state shown in FIG. 2. FIG.

FIG. 4 is a vertical sectional front view of a bulge molded product taken out from a bulge mold.

FIG. 5 is a vertical cross-sectional front view of a bulge molded product after a hole is formed and burring is performed.

FIG. 6 is a vertical cross-sectional front view of an eye-shaped joint completed by cutting.

FIG. 7 is a vertical sectional front view showing an example of a usage state of the eye-shaped joint.

FIG. 8 is a plan view of an eye joint.

[Explanation of symbols]

 A-Eye joint a-Element pipe 1-Head 2-Bulge die 3-Bulge die 4-Head hole portion 5-Curved inner peripheral surface 6-Opening portion 7-Opening portion 8-Pipe portion Hole 9-pressurizing material 10-punch 11-punch 12-side end surface 13-pipe portion 14-bulge molded product 15-head portion 16-pipe portion 17-curved inner peripheral portion 18-side end portion 19-hole part 20-curved outer peripheral surface 21-tank part 22-screw hole 23-seal material 24-tightening bolt 25-through hole 26-piping d-outer diameter h-height x-center line

Claims (1)

[Claims] 1. A short tube-shaped blank tube a is formed in a curved inner peripheral surface 5 having an inner diameter substantially equal to an outer diameter d of a head 1 of an eye-shaped joint A in the center line X direction of the head 1. The head tube portion 4 having the openings 6 and 7 and the pipe portion hole portion 8 extending laterally from the hole portion 4 are engaged in the bulge molds 2 and 3, and With the elastic material or the liquid pressurizing material 9 filled therein, the openings 6, 7 of the bulge molds 2, 3 are filled.
From the punches 10 and 11 on both sides,
2 and the pressurizing material 9 are pressed to form a bulge molded product 14 in which the head portion 15 and the pipe portion 16 are bulged, and the pipe portion 16 of the bulge molded product 14 is It is punched and further pulled out by burring, and thereafter, the curved inner peripheral portion 17 of the head portion 15 and both side end portions 1 are formed.
8, 18 and the hole portion 19 of the pipe portion portion 16 are each finished by finishing cutting.
Manufacturing method of eye-shaped joint.