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Forging method, closed forging mold and tripod uniform motion universal joint

A technology of constant velocity universal joints and closed forging, which is applied in the direction of manufacturing tools, gear transmission mechanisms, forging/pressing/hammer devices, etc., can solve the problems of reduced life of blocking devices and high cost of forging presses, etc., to reduce load and suppress Forging equipment cost, the effect of reducing load

Active Publication Date: 2013-10-23
NTN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, use at the upper limit of the rated occlusion force results in a reduction in the life of the occlusion device
In addition, when forming a large-sized product that requires a larger closing force, it is necessary to use a closing device that can apply a desired large closing force, and accordingly, the size of the forging press is also increased, and the cost is also increased.

Method used

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  • Forging method, closed forging mold and tripod uniform motion universal joint
  • Forging method, closed forging mold and tripod uniform motion universal joint
  • Forging method, closed forging mold and tripod uniform motion universal joint

Examples

Experimental program
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Effect test

Embodiment 1

[0053] Next, the closing force applied to the forging dies 11 and 12 of the closed forging die was studied, and the results are shown in Table 1 below. The taper angles in Table 1 are the taper angles of the tapered portion 33 . Moreover, the wall thickness H of the hub portion 18 is 28mm, the curvature radius R1 of the convex curved surface portion 32 is 22mm, the dimension L1 of the first flat surface portion 31 is 0mm, and the dimension L2 of the tapered surface portion 33 is 12.1mm at a taper angle of 5°. , 8.6mm at a taper angle of 15°, 5.2mm at a taper angle of 25°, the radius of curvature R2 of the concave surface 34 is 0mm, and the dimension L3 of the second flat portion 35 is 0mm.

[0054] 【Table 1】

[0055] Cone angle ∠α

[0056] It can be seen from this table 1 that, unlike previous products (such as figure 2 As shown by the imaginary line of , the outer diameter surface is composed of a circular arc surface centered on the axis of the hub part), compar...

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Abstract

Provided are a forging method and a full-enclosed forging die which contribute to alleviation of an enclosing force applied to dies and in which a relatively small enclosing apparatus can be used even with respect to larger-sized products. Further, provided is a tripod type constant velocity universal joint using a tripod member molded with such a full-enclosed forging die. Using a full-enclosed forging die including openable / closable dies (11, 12) and punches (14, 15) for pressing a material between the dies (11, 12), a product (tripod member) (16) including a boss portion (18) and shaft portions (17) protruded radially from the boss portion (18) is molded. A projection area in a boss-portion axial direction toward a die (11, 12) side of the boss portion (18) is made to be smaller than another projection area in the boss-portion axial direction toward the die side, the another projection area being defined when a radially outer surface is formed as a single convex curved surface about a boss-portion axial center.

Description

technical field [0001] The invention relates to a forging method, a closed forging die and a tripod type constant velocity universal joint. Background technique [0002] A closed forging die is used when using closed forging to form products such as trunnions (triple ball parts) for constant velocity universal joints and cross shafts for universal joints, in which the hub is radially formed. [0003] Blocked forging dies are described in Patent Document 1, etc., such as Figure 7 As shown, there are provided: openable and closable forging dies 1, 2; and drivable forging heads 4, 5 arranged on the central axis of the forging dies 1, 2. That is, the forging dies 1 and 2 are closed and the forging heads 4 and 5 perform forging to form a cavity 9 corresponding to the shape of the shaft portion 7 and the boss portion 8 of the product 6 . Therefore, when the billet (material) is put into the forging die and then clamped and forged by the forging heads 4 and 5, the billet is plast...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21J5/02B21J13/02B21K1/14F16D3/20F16D3/205
CPCF16D3/2055B21J5/02F16D2250/00B21K1/762B21J5/025B21K1/763F16D2250/0023F16D2003/2026
Inventor 缪家骅世良昌牧野俊介
Owner NTN CORP