JPS60154838A - Production of constituting parts for synchronous joint - Google Patents

Abstract

PURPOSE:To flatten the end face on the aperture side of a crude joint product by reducing the outside diameter of said product over the entire part and subjecting the outside circumferential part corresponding to a thick-walled part to cold ironing by which grooves are formed to a prescribed length. CONSTITUTION:Projections 14 forming grooves 7 of a prescribed length are formed to the outside circumferential surface corresponding to the thick-walled part of a crude product W in a lower die 12 for ironing from the low wall part 2b toward the aperture. The product W is installed in the prescribed position of the die 12 and a punch 13 is lowered and is fitted into the hollow part 4 in a body part 2. The outside diameter of the product W is reduced over the entire part by the cooperative movement of the punch 13 and the die 12 and the grooves 7 are formed on the outside circumferential surface corresponding to the thick-walled part. The elongation rate in the longitudinal direction in the body part 2 of the product W is thus made approximately constant and the end face of the aperture is flattened. The reduction in weight of the joint is made possible by formation of the grooves 7.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method for manufacturing constant velocity joint components, and in particular to a method for manufacturing constant velocity joint components while maintaining high processing accuracy through cold working and desired strength as a component. There is a ¥J manufacturing method that can reduce the weight of component parts.

(Prior art) @The outer ring, which is a component of a speed joint, has a cup-shaped vertical cross section consisting of a cylindrical main body having a frontage at one end and a bottom wall provided at the other end of the main body. A plurality of grooves extending vertically on the circumferential wall of the cylindrical main body are provided. A constant velocity joint component having such a shape is formed by forging because the shape of the circumferential wall is complex and at the same time, a strong melon is required as a product.

By means of a forged I-culm (constant velocity join 1-component parts that have been plasticized into a predetermined shape, a rubber boot is attached to the opening side of the main body after plasticization 1). The final product is made by performing machine side iL such as grooving.Even in this machining process, the open side end face of the main body is uneven before the forging process is completed. , In order to finish this end face into a flat surface, the machine side: ■ was essential.

A conventional method for manufacturing the above constant velocity joint component is disclosed in Japanese Patent Publication No. 19806/1983. This method involves forming vertical grooves over the entire length of the outer circumferential surface of the main body by ironing (1). Between the sections [the end surface on the first section side was uneven, and machining of this surface was required. In addition, this groove on the outer circumferential surface has the problem that it cannot be installed 6 deeper than the depth of this annular groove because an annular groove or a small-diameter stepped portion for attaching the boot is formed at the tip of the main body. can be,
In the technique of forming vertical grooves on the outer peripheral surface of the main body, there is a limit to the depth of the grooves as described above, and it is not possible to substantially reduce the weight.

As mentioned above, if the tip of the main body after forging is uneven, it will be necessary to machine the tip to make it flat later, so the tip will also be flattened at the end of the forging process. 1q, equity 11R53-2
There is a manufacturing method shown in 82524 publication. This method involves ironing so that the thickness reduction rate is constant between the thick interior and the thin section, and the D section has the same thickness over the entire length in the vertical direction. It is impossible to make the product popular.

(Purpose of the Invention) The present invention provides a method for forming a constant velocity joint component having a structure that can reduce weight while maintaining high processing accuracy and desired strength. The purpose of this is to flatten the side edges so that they are 1g thick.

(Structure of the Invention) - Achieving the Distribution Achievement The present invention has a vertical cross section consisting of a cylindrical main body having an opening at one end and a castle wall provided at the other end of the main body. A constant velocity join 1~component that has a cup shape and has a plurality of concave grooves extending vertically on the inner peripheral wall of the cylindrical main body! ll manufacturing method, the outer periphery includes a thin wall portion located on the outside in the radial direction of the groove, and a thick wall portion located between each of the grooves, and the outer periphery has a cross section. The outer diameter of the crude product having a circular shape is reduced by 4 in total, and the outer circumferential surface of the part corresponding to the thick part is tJ directed from the bottom wall part to the distance part. It has a predetermined length and 8 grooves are formed.
Constant velocity coin t-
This is a method for manufacturing component parts.

(Example) Hereinafter, the present invention will be explained based on an example, which is not shown in the drawings.

FIG. 1 is a diagram that does not show the process of manufacturing a crude product W for d months according to the manufacturing method of the present invention. First, a cylindrical material w1 as shown in FIG. 1A is subjected to forward extrusion processing to form a shaft portion 1 and a solid main body portion 2, as shown in FIG. Then, as shown in FIG. 1(C), the main body portion 2 is crushed by upsetting, and further pushed backward by 1° as shown in FIG. 1(D) to form the main body portion 2 into a cup shape. Each of these forging processes is performed by cold forming.

After the machining shown in FIG. 1<D), the cross section of the crude product W is shown in FIG. 2. As shown in FIG. 1(D) and FIG. 2, the crude product W includes a cylindrical main body part 2 having a frontage part 2a at one end and a bottom wall part 2 provided at the other end of the main body part 2.
The cylindrical main body part 2 has a plurality of grooves 3 extending in the vertical direction on the inner circumferential wall of the cylindrical main body 2, and the outer side of the grooves 3 in the radial direction is Thin wall part 5
In particular, the area between the groove 3 and the other groove 3 is the thick part 6.
The outer peripheral surface has a circular cross section over the entire length in the vertical direction.

FIG. 3 is a diagram showing a forging die for finally ironing and re-aging the rough product W according to FIGS. A single type 12 with a cavity 11 corresponding to the shape of the surface, etc.
It consists of a bunch 13 whose outer circumferential surface has a shape corresponding to the circumferential surface of the hollow part 4 of the rough product W, and whose outer circumferential surface is right-handed. Downward 1 (12), a predetermined length of 41'?
A protrusion 14 is formed for forming the .

A large diameter portion 15 and a tapered portion 1G are formed in one pane of the lower mold 12 to facilitate the determination of lf/ and tα when placing the crude product W on the lower mold 12. A tapered part 8 for positioning, which corresponds to the human diameter part 15 and the nova part 16, is formed on the outer peripheral surface of the bottom wall part 21) of the crude product W. In addition, the inner diameter of the cavity 11 is smaller than the outer diameter of the raw product W by +3. has been reduced overall. Bon'
The outer circumferential shape of /-13 is the same as the shape of the hollow part 4 of the crude product W, but the shape of the hollow part 4 and the outer circumferential shape of the punch 13 start to differ, and the inner circumferential surface of the crude product W The outer peripheral surface may also be ironed at the same time as the outer peripheral surface.

In order to process and cover the product WO of the constant velocity joint component using the forging die 10 shown in FIG.
Install it in the designated position of 2. Next, the bunch 13 is placed in the lower mold 1.
2 (lower the punch 1 into the hollow part 4 of the crude product W)
3 are combined with IK, and by the cooperation of the punch 13 and the lower mold 12, the outer diameter of the rough product W is reduced over the entire area, and the outer circumferential surface of the portion corresponding to the thick wall portion 6 of the rough product W is The ironing process is performed while avoiding forming a groove 7 extending a predetermined length to the right from the bottom wall portion 21) toward the opening 1'' portion 2a. Thereby, the elongation rate of the main body portion 2 of the crude product W in the longitudinal direction and the axial direction can be made substantially constant at each position of the longitudinal section.

Figures 4 to 7 show a crude product W made using the forging die 10 shown in Figure 3.
FIG. 2 is a diagram showing a product WO that has been nized by applying a sizing process. Product WO consists of a cylindrical main body part 2 having an opening 2a at one end, and a bottom wall part 2+1 installed at the other end of the main body part 2, and has a cup shape in vertical section with a hollow part 4. None, there are three grooves 3 extending in the vertical direction on the inner peripheral wall of the cylindrical main body 2.

4 and 4 on the outer circumferential surface of the portion of the cylindrical body portion 2 between the groove 3 and the other groove 3, that is, the portion corresponding to the thick wall portion 6 of the rough product W. As clearly shown in FIG. 7 (4T), a vertical groove 7 is formed with a predetermined width N from the bottom wall portion 21) toward the 1 portion 2a. Further, at +13 in FIG. 6.7, the outer circumferential dimension of the one-phase product W shown by the imaginary line C is reduced as shown by the solid line. Further, as is clear from FIG. 6, a portion having a circular outer circumferential surface is formed in the tip portion of the main body portion 2 within a length M range.

As shown in the upper part 1ffl, by forming a groove 7 of a predetermined length on the outer peripheral surface using the protrusion 14 of the lower die 12, the elongation rate in the vertical direction (axial direction) in the thin-walled part 5 and the thickness 17 can be adjusted. It is now possible to make the lengthwise extending skewers in the part 6 almost the same, so that the length of the skewer in the main body part 2 that is placed after the forging die 10 ironing step 1111:ii in FIG. The end face on the 2a side is approximately uniform over the entire circumference, or is close to +1 (+1). This eliminates the need to flatten the end face later by machining.

Moreover, since the groove 7 with a sufficient depth is formed in the thick wall portion 6, it is possible to substantially reduce the weight of the constant velocity joint component, which has helped to reduce the weight of vehicles in recent years. We can fully meet your needs. After the ironing process is completed, an annular groove 4 is formed on the outer periphery of the tip of the main body 2.
Cover the small diameter part of the T-wheel at the front of the machine so that a rubber boot, which can be used in battles, can be attached to that part.

In order to make the end face of the product WO a flat surface by performing sawing using the forging die shown in Fig. 3, the =J method of the product WO is determined in the design. , From these dimensions, the thickness of the main body portion 2 of the crude product W, in other words, the outer diameter j of the crude product is determined.

Next, the means for setting this dimension is shown in Fig. 8 (A>
This will be explained with reference to (B). In this case, only the outer peripheral surface of the rough product W is ironed, as shown in Fig. 8 (A>
shows the cross section at the position Y1 in the same figure (B), and the 8th
Figure (B) shows a vertical section at the X+-X position of +51 in the fijt diagram <A). Crude product W shown in the cross section shown in the diagram
The thickness of the main body part 2 is a.

The straight 1st child is d, and the 1st diameter of the product Wo after straining: L is d.
If J-wami is written as X, and the depth of full 7 is written as ×-, then () Gosaka-
The minute elongation ff1△y of the cross section at the position of Yl due to 1 is
Δy− (a・△x1 ・Δy1−x・Δ×1 ・△V+>7/
(x ・Δ×1 〉 〉 〉 〉 〉 〉 〉 〉 〉 〉 〉 〉 〉 〉
0 to YΔxn1. By reducing the elongation of ′c, the elongation of each cross section is constant or close to constant, that is, YΔxo=YΔ×1−YΔx 2 =−−−−−−YΔ
Determine the ratio of l]thickness of product W+1, that is, outer circumferential dimension d, etc., so that x11.

Since the forging process of the present invention is performed by a cold process, it is possible to maintain the accuracy of the Karasu method.
The formation of Tom 7 (of the product WO) is done by -ki 1 during the final forging process.
Since this is carried out in a process, the outer circumferential surface of the crude product W is circular in the pre-process up to -derection, and the life of the cold forging die used in the pre-process can be shortened. Moreover, since the groove 7 is formed on the protrusion 14 during the final ironing process [(4)-Ising), the life of the forging die for ironing process can be increased to the extent that it can be made into a large size. I can do it.

(Effects of the Invention) As described above, according to the present invention, the vertical cross-sectional cup shape is made up of a cylindrical main body portion having a frontage portion at one end and a bottom wall portion provided at the other end of the main body portion. A method for manufacturing a constant velocity joint component having a plurality of grooves extending longitudinally in an inner circumferential wall of the cylindrical main body, the method comprising: a thin wall portion positioned radially outward of the grooves; 1) A rough product having each of the grooves and a thick wall portion located between the grooves and the outer periphery having a circular cross section is reduced in its entire outer diameter. I! Then, on the outer circumferential surface of the part that corresponds to the inside of the thick-walled part marked +"+Ft, from the bottom 9 part to the above-mentioned space [1 part, τ is formed to i which represents a predetermined quality. The elongation rate in the axial direction of the cylindrical main body part of the cylindrical body part of the ts r, W stray joint 1 is set to be approximately constant at the position of the vertical cross section of the -U bend, and At the end of the ironing process, the end face on the front side of the main body of the product will be flattened to the extent that machining of the end face will be unnecessary in the next two or so steps, resulting in uneven surfaces. Processing Jv
It is possible to reduce l. Additionally, grooves with sufficient depth are formed on the outer circumferential surface of the product, making it possible to reduce the weight of the product without reducing its strength. Moreover,
The groove does not reach the (1; mouth) part of the main body, so it is light 1.
It is possible to form a circular groove 41 or a small diameter part by placing a rubber boot in a position unrelated to the depth that is deep enough to achieve T1. .

[Brief explanation of the drawing]

Figure 1 (Δ) - (1)) is the constant velocity join I of the present invention.
・(Cross-sectional view not showing the cold forging process of the crude product in the manufacturing method of one-part part, Figure 2 is a cross-section along If-It tQ in Figure 1 (D)) Figure 3 is a cross-sectional view of the cold forged Ti mold used in the manufacturing method of the present invention, and Figure 4 is a longitudinal cross-sectional view of the final constant velocity joint component formed by the !II manufacturing method of the present invention. Figure 5 is a plan view of Figure 4, Figure 6 is a sectional view taken along the line -■ in Figure 4, Figure 7 is taken along the line Vll-■1 in Figure 4. Cross-sectional view, Figure 8 (Δ) (+3> is J) G on any cross section of the product
It is a 1J sectional view showing the dimensional relationship between the two. 2... Main body part, 3... Concave groove, 4... Hollow part, 5...
... Thin wall part, 6... Thick wall part, 7... Bulk, 12...
F type, 13...Punch, 14...Protrusion, W...Rough product, WO...Product. Special W [Applicant: Nissan Motor Co., Ltd. Figure 1, Figure 2, West Figure 4 a

Claims (1)

[Claims] (1) It has a vertical cross section h-shaped, consisting of a cylindrical main body part with one end at one end and a bottom wall part provided at the other end of the main body part, and the inner circumferential wall of the cylindrical main body part 7-speed stain 1in] having a plurality of grooves extending in the longitudinal direction; and a method for manufacturing a component (located on the outside in the radial direction of the grooves!/
=J) A rough product with a thick walled part between the inside of W and each of the grooves and the outer periphery of which has a circular cross section. The outer diameter of the product is carefully adjusted (
At the same time, apply cold ironing to the outer periphery of the part corresponding to the 1st width part from the bottom wall part to the 11th part of the gap (avoiding the formation of a predetermined length of η). A method of manufacturing a constant velocity joint component, characterized in that it is shaped like an L. (2) Constant velocity joint 1 - A cross-section of the longitudinal plane and the circumferential inner surface of one machine of the drawn part. a3 Ril J7 of the above crude product
(a・Δx1・△y1−×・Δ×Ma °ΔV+)/'
Based on the thickness a, the octopus, which is obtained by integrating the slight elongation Δy in the vertical direction expressed as (×・ΔX+) over the entire lengthwise direction, is approximately constant at a3 on all the longitudinal cross sections of the main body after ironing. 2. The method of manufacturing a constant velocity joint component according to claim 1, wherein the outer diameter value of the crude product is determined by