JP4319862B2 - Manufacturing method for eye joint fittings - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing an eye joint fitting, and more particularly to a method for producing an eye joint fitting by cold forging.
[0002]
[Prior art]
Conventionally, a brake hose used in automotive, power steering hose, a pressure hose that is used in the oil cooler hoses or various industrial equipment, eye joint port fitting is connected to the distal end, the subject through the eye joint port bracket Attached to the device. The eye joint fitting is formed integrally with an annular part and a pipe part for connecting a hose. By inserting an eyebolt into the annular part and screwing a threaded part of the eyebolt into a target device. Although connected integrally, when screwing, packing is provided on the upper and lower surfaces of the annular portion to prevent fluid leakage.
[0003]
If an example of the manufacturing method of the said eye joint fitting is shown, as shown in FIG. 5, first, the rod-shaped raw material 1 is cold-forged, the spherical part 2 is shape | molded at the front-end | tip part, and then it will contact | connect the spherical part 2 Next, the neck 3 is cut (FIG. 5B). Next, as shown in FIG. 5C, the fluid passage 4 is formed substantially in the axial center by drilling. The drilling can be performed by cutting or forging. After forming the fluid passage 4, the sleeve 5 and the nipple 6 are subsequently formed by cutting. Next, the sealing surface 7 is formed so that the spherical portion 2 becomes a horizontal parallel surface with respect to the axial direction, and the eyebolt insertion hole 8 is cut. The Ibol insertion hole 8 communicates with the fluid passage 4.
[0004]
The pressure hose is inserted between the sleeve 5 and the nipple 6 and fastened integrally with the eye joint fitting by crimping the sleeve 5. In order to attach to the target device, a seal is disposed on the seal surface, and the eyebolt is connected to the insertion hole 8 by passing the eyebolt through the insertion hole 8 and screwing the threaded portion of the eyebolt.
[0005]
[Problems to be solved by the invention]
However, in the above-described conventional manufacturing method, the cold forging only forms the spherical portion 2 in the rod-shaped material 1, and the fluid passage 4, the sleeve 5, the seal surface 7, and the eyebolt insertion hole 8 are formed by cutting. Therefore, it takes time and the material yield is poor. For this reason, there are problems that the production cost is high and the productivity is poor.
[0006]
The present invention has been made in view of the present situation. By separately molding a sleeve main body and a nipple main body, and molding the sleeve main body by cold forging, the eye joint opening has a low production cost and a good yield as a whole. It aims at providing the manufacturing method of a metal fitting.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is configured as follows. That is, a manufacturing method of an eyepiece fitting according to the present invention is a manufacturing method for fixing a sleeve body and a nipple body that are divided and molded, and the sleeve body includes an upper die provided with a projection for drilling. After cold forging in the direction perpendicular to the axis of the rod-shaped material with the lower mold, the neck and the annular part into which the eyebolt is inserted are molded, and then cooled in the axial direction from the opposite side of the annular part. By simultaneously forging, the sleeve and the fluid passage in the neck are molded at the same time, and a nipple abutment surface that forms a right angle to the fluid passage is formed in the sleeve, and a flange is formed at one end of the separately molded nipple A flange-like joint portion of a nipple main body provided with a joint portion is fixed to a nipple abutting surface in the sleeve main body. The sleeve body is manufactured in two steps by cold forging.
[0008]
According to this manufacturing method, since the sleeve body can be formed by two-step forging in the circumferential direction and the axial direction, the process can be simplified and a complicated apparatus is not required. Moreover, since it can shape | mold only by forging, not only generation | occurrence | production of a chip | tip and a work environment can be maintained favorable, but a chip | tip does not mix with a fluid. .
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments illustrating the present invention will be described in detail below. The eye joint fitting according to the present invention is divided into a sleeve main body 20 and a nipple main body 30, and the sleeve main body 20 is formed by cold forging. That is, as shown in FIG. 1A, in order to mold the sleeve body 20, first, the neck portion 21 and the annular portion 22 are formed by cold forging in a direction perpendicular to the axial direction of the rod-shaped material 1. Are simultaneously molded and drilled.
[0010]
Protrusions for drilling are provided on the abutment surface of the upper mold and the lower mold so as to mold the annular portion 22, and the eyebolt insertion hole 23 is formed on the inner side by abutting these upper mold and lower mold. The annular portion 22 and the neck portion 21 can be molded in one step.
[0011]
Next, by cold forging in the axial direction of the rod-shaped material 1, a sleeve 24 and a fluid passage 25 in the neck portion 21 are formed as shown in FIG. By performing the forging direction from the side opposite to the annular portion 22, the sleeve 24 and the fluid passage 25 can be molded in one step. A nipple abutting surface 26 that forms a right-angled surface with respect to the flow passage 25 is formed at the connection portion between the neck portion 21 and the sleeve 24.
[0012]
On the other hand, the nipple main body 30 is formed by forming a flange-like joint portion 32 at one end of a nipple 31 as shown in FIG. The nipple body 30 can be molded by a known method. For example, the end of the pipe can be plastically deformed to form a flange-like joint, or can be formed by cold forging.
[0013]
As shown in FIG. 3, the sleeve body 20 and the nipple body 30 molded as described above abut the flange-like joint portion 32 of the nipple body 30 against the nipple abutting surface 26 formed at the bottom of the sleeve 24. Are joined. The nipple butting surface 26 and the flange-like joint portion 32 can be integrally fixed by projection welding or friction welding.
[0014]
FIG. 4 is another embodiment showing a method for fixing the sleeve body 20 and the nipple body 30 together. The nipple body 30a is simply formed as a pipe-shaped nipple 31a, and may be fixed to the fluid passage 25 by brazing or press-fitting.
[0015]
【The invention's effect】
As is apparent from the above description, according to the present invention, a sleeve body including an annular portion and a sleeve on both sides of a neck portion having a fluid passage can be formed from a rod-shaped material by cold forging in two steps. Therefore, the production cost can be reduced, and since there is no cutting process, the yield of the material is improved, and an inexpensive eye joint fitting can be obtained in which there is no possibility that the chips are mixed into the fluid.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing a process of forming a neck portion and an annular portion from a rod-shaped material by cold forging and then forming a sleeve and a fluid passage.
FIG. 2 is a cross-sectional view showing an example of a nipple main body.
FIG. 3 is a cross-sectional view showing an embodiment of an eye joint fitting in which a sleeve body and a nipple body are assembled.
FIG. 4 is a cross-sectional view showing another embodiment of an eye joint fitting in which a sleeve body and a nipple body are assembled.
FIG. 5 is an explanatory view showing a manufacturing process of a conventional eye joint fitting.
[Explanation of symbols]
20: Sleeve main body 21: Neck part 22: Ring part 23: Bolt insertion hole 24: Sleeve 25: Fluid passage 26: Nipple abutting surface 30: Nipple main body 31: Nipple 32: Flange joint

Claims (1)

A manufacturing method for adhering a sleeve body and a nipple body that are divided and molded, wherein the sleeve body is orthogonal to the axis of the rod-shaped material by an upper mold and a lower mold provided with a projection for drilling. After forming the neck part and the annular part into which the eyebolt is inserted by cold forging in the direction, the sleeve and the fluid passage in the neck part are formed by cold forging in the axial direction from the opposite side to the annular part. Are formed at the same time, and a nipple abutting surface that forms a right angle with respect to the fluid passage is formed in the sleeve, and a flange-like joint portion of the nipple body is formed by separately molding and providing a flange-like joint portion at one end. Is fixed to the nipple abutting surface in the sleeve main body .

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