JPS59225843A - Production of semi-finished product of eye joint - Google Patents

Abstract

PURPOSE:To manufacture efficiently the semi-finished product of an eye joint by forming a blank material which is cut to a fixed length with one stage of a fully automatic six-stages cold forging machine to a U cup shape with 2-4 stages, forming a hollow stem part with 5 stages and forming a step of the stem part and a head part with 6 stages. CONSTITUTION:A blank material which is cut to a fixed length with one stage of a fully automatic six-stages cold forging machine is formed successively to a U cup shape 1b with 2-4 stages (ABC). The material is inserted in an opposite direction into the 5th stage (D) and a hollow stem part is formed by a punch 7a. A step of the stem part is formed by the stepped pin 7b of the 6th stage (E) and the spherical shape of the head part is formed with a punch die 8. A piece of a semi-finished eye joint is eventually and efficiently manufactured in about one second by the above-mentioned continuous operation.

Description

[Detailed Description of the Invention] This invention is an eye joint (also known as an eye connector) that is attached to the end of an automobile fuel pipe, oil vibrator, etc.
Regarding the manufacturing method of semi-finished products (commonly known as eyes, eyeglasses), they are formed by rolling 1- using a multi-stage cold rolling L1, forming dies, heading bunches, etc. without cutting the cylindrical pieces, which results in wasted material. This makes it extremely easy to manufacture the finished product, i.e. by attaching the cylindrical metal piece to a cold heading die and extruding it backwards with a punching bunch. is carried out to form a hollow cap body, and the hollow cap body is attached to a heading die in the next stage, and the body head is formed into a convex arc surface on the cap d using a heading bunch, and further a tube is formed from the open end of the hollow cap body. Inserting a forming pin, forming a tapered surface in the middle of the hollow cap body using the next heading die, and forming a tube part continuously to the tapered surface, and further attaching the hollow cap body to the final heading die, This manufacturing method is characterized in that the hollow cap body is formed into a semi-finished product consisting of a hollow sphere portion, a tube portion having an O-shaped small diameter portion and a large diameter portion using a punch die and stepped pins.

Conventionally, eye joints as shown in FIGS. 2 and 6 ([) have been used at the ends of automobile fuel vibrators, mower vibrators, etc. This eye joint has conventionally been manufactured by the sono method shown in FIG.

Instead, the primary manufacturer made a so-called [-solid] half-$4J metal fitting a with a spherical head and cylindrical parts using metal such as iron or aluminum. ,
Next, as shown in FIG. 6(A), the secondary processor fixes the semi-finished product a with the chuck 1) of an automatic lathe, and uses a small diameter drill C to drill the shield part 21' (FIG. 6B). Next, use a large-diameter drill C' to form a stepped hole (Fig. 6 C).
, then change the direction of the metal fitting a using the chuck 1)' (6th
Figure D), use the bit d to cut one side of the spherical part a'' (Figure 6E), and use the drill C'' to drill a center hole perpendicular to the extension line of the stepped hole (Figure 6F). After that, change the direction of the metal fitting a (Fig. 6G), cut the other side of the spherical part a'' with the cutting tool (I), and finally use the boring tool d.
′ is used to cut the periphery of the eye hole to form an eye joint. In the figure, X is the bearing shaft.The conventional method described above involves many secondary processing steps, which not only requires a great deal of time, effort, and skill, but also results in a lot of wasted material and reduces the quality of the product. The strength and degree are also low.

It is also possible to manufacture this eye joint by die-casting, but die-casting would make the product fragile and would be useless as an important safety part, especially for automobiles.

This invention completely eliminates the drawbacks of the conventional examples mentioned above, and moreover, it was previously considered impossible to make a metal fitting consisting of a spherical head and a cylinder hollow without cutting it. The configuration of one embodiment will now be described in detail with reference to the drawings. Without cutting, a 20 mm diameter iron coil was cut into a length of 15.5 mm using a 6-station Part Four'r (fully automatic multi-stage cold heading machine) including a cutting means. The cylindrical piece 1a obtained by cutting is shown in Figure 4 (A
), the head 1 a is automatically transferred and attached to the first cold heading die 2 a , the knockout pin 3 a is still in contact with the head 1 a 7 , and the head 1 a is press-formed with the forging bunch 4 a . A conical Dever surface is formed and an extremely shallow recess 5a is formed. At this time, the diameter of the cylindrical piece 1a is 2
15 holes, length is 3.5 mm. Next, the cylindrical piece 1a is extruded from the first die 2a by the knockout pin 3a, and automatically attached to the second cold heading die 21], and the head part 1a is brought into contact with the knockout pin 3a to form a small diameter head. A punch 41) is pushed in and backward extrusion is performed to make a hole, thereby forming a cylindrical piece 1a into a hollow cap body 1) (FIG. 4B). At this time, the outer diameter of the hollow cap body 11) is 2165 mm, the inner diameter is 16.5 mm, and the length is 27-1 large hole 51).
The depth of the head 13' is 23mm. 1) Next, the hollow cap body 11) is automatically attached to the third heading die 2C, and the head 13'
A small-diameter knockout pin 31) is still attached to the hole, and the forging bunch 4c with a hemispherical tip is pushed into the large hole 5b formed in the previous step to make the head 1a/ of the hollow cap body 11) convex. It is formed into an arcuate shape (Fig. 4C). At this time, the outer diameter of the hollow cap body 1b is 2175mm, the inner diameter is 1f+, 4+am, and the height is 30mm.
tnm, and the depth of the large hole 51) is 275 mu. After that, the fourth tube-forming pin 7a passes through and a knockout sleeve 6a with a protruding tip 721' is set.
The hollow cap body] 1] is inverted and attached into the forging die 2d, and a forging bunch 4 having a concave arc-shaped tip is attached.
d, the hollow cap body 1b is pushed in to form a conical tapered surface 11]′ in the middle of the hollow cap body 11), and the tube part 11
′)” (Fig. 4D). At this time, a hollow cap body]
1) The length is 42mm, the outer diameter of the head 1a is 21.8mm, the inner diameter is 16.8mm, the length of the tube part 11) is 12mm, the outer diameter is 13mm, the inner diameter is] 0 .2 rran.Furthermore, the hollow cap body 1b is extruded from the forging die 2d by the knockout sleeve 6a, and then the hollow cap body 1b is pushed out into the fifth forging die 2X into which the knockout sleeve 6a' through which the stepped pin 71 is inserted is set. The body 11) is automatically transferred, and the punch die 8 is used to form the head 13' and the tapered surface 11)'.
A semi-finished product is obtained by forming a tube hole 1' in a hollow spherical part 1 and forming a tube hole 1' in a dog/small diameter part 1B, 1B'. At this time, the length of the hollow cap body 1b is 36 yu, the outer diameter of the hollow sphere part 1 is 24 yu, the inner diameter is 19711711, the length of the tube part 1b'1 is 12 yu, the outer diameter is 13 yu, and the large diameter part 1B The diameter of s/ is 10.1 door, small diameter part] The diameter of s/ is 85 mm. Therefore, the secondary processor cuts both sides of the semi-finished product with a hide, as in the conventional example, to form the eye joints shown in Figures 2 and 3.

”, in this invention example, it takes about 5 seconds per piece to obtain a semi-finished product through the 5 types of dice, or in reality, the 5flΦ dice work at once without being played, so it takes 1 piece per piece. It can be produced in seconds, which is the same time as it takes to machine a semi-finished "peel" product in the conventional example. On the other hand, the conventional example
In contrast to the multi-step process described above in the subsequent processing, in this example of the invention only the side surface is cut, so it goes without saying that the time required for the secondary processing is significantly shorter in the example of the invention.

In this way, the present invention takes the same amount of time for primary processing as the conventional example, but requires extremely fewer steps for secondary processing.
In addition, the time can be shortened, and since it is done by rolling without cutting, there is no waste of materials, and it can be manufactured at low cost, and it is also possible to obtain a product with high strength and precision. .

[Brief explanation of the drawing]

Figures 1 to 4 show examples of the invention; Figure 1 is a partially cutaway perspective view of a semi-finished product obtained by the method of this invention;
Figure 2 is a perspective view of the finished product, Figure 3 is a sectional view showing the finished product in use, Figure 4 is an explanatory diagram showing the manufacturing process, and Figure 5 is an explanatory diagram showing the manufacturing process.
The figure is a half-sectional side view of the metal fittings in the manufacturing process, No. 6
The figure is an explanatory diagram of the conventional method. 1...Hollow sphere part 1a...Cylindrical piece 1a/
...Cap body head] b...Hollow cap body 11)'・
... Taper 11] II... Pipe section 1 B...
Large diameter part 1B'...small diameter part 21), 2C12(
1, 2 pieces...heading die 41), 4C...heading punch 7a...tube forming pin 7 b...stepped pin 8...
・Punch die (A) Me ・Figure 5 (D) (E)

Claims (1)

[Claims] Attaching a metal cylindrical piece to a cold heading die and extruding it backwards with a forging bunch for perforation to form a hollow cap body, attaching the hollow cap body to the next stage of the forging die, and Forming the head part of the cap body into a convex arc surface with a heading bunch, further inserting a tube forming pin from the open end of the hollow cap body, and forming a hetabar surface in the middle of the hollow cap body with a next heading die, and A tube portion is formed continuously on the tapered surface, and the hollow cap body is attached to a final heading die, and the hollow cap body is formed into a hollow sphere portion, a small diameter portion, and a large diameter portion using a punch die and a stepped pin. 1. A method for manufacturing a semi-finished product of an eye joint, which comprises forming a semi-finished product consisting of a pipe portion.