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Method of producing raceway ring member for rolling bearing unit

By crushing the cylindrical material in the axial direction and performing plastic deformation processing, combined with the use of different temperatures and tools, the problem of difficulty in adjusting the diameter difference of the outer ring raceway in the existing technology is solved, and high yield and short processing time are achieved. , reducing the manufacturing cost of rolling bearing units.

Active Publication Date: 2010-07-21
NSK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The practice of making the diameters of the two outer ring raceways very different not only increases the processing time, but also reduces the yield of materials, which becomes the reason for increasing the manufacturing cost of the outer ring 3
Moreover, using the above-mentioned manufacturing method, the processing amount of the front extrusion processing has to be increased to a certain extent, because the increased amount needs to be Figure 7 Time is spent in the process of (B) → (C), therefore, the processing time is also increased from this aspect, and the manufacturing cost of the outer ring 3 is increased.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0040] Figure 1 to Figure 3 A first embodiment of the present invention is shown.

[0041] If the manufacturing method of the first embodiment is used, first, by crushing in the axial direction figure 1 The cylindrical material 17 shown in (A) is subjected to upsetting for enlarging the diameter to form figure 1 (B) The beer keg-shaped first intermediate material 18 shown. This process is associated with Figure 7 The steps of (A)→(B) are the same, and any of heat treatment, warm treatment, and cold treatment may be performed.

[0042] Then, plastic working (hot forging) is performed on the first intermediate material 18 in a die unit including a stamper (punch) and a pad (counter punch). The cavity of the metal mold, the die and the pad are arranged concentrically with each other. The cavity has a desired inner shape, ie an inner shape corresponding to the outer shape of the spare second intermediate material 19a that should be obtained. In order to carry out the pla...

no. 2 example

[0064] Figure 4 The method of the second embodiment of the present invention is shown. In the first embodiment described above, the punch 29 moved in the axial direction was used in order to enlarge the diameter of the axially outer half of the third intermediate material 27a to obtain the fourth intermediate material 30 . In the second embodiment, as Figure 4 As shown in (H), the diameter of the outer half in the axial direction of the third intermediate material 27 a is enlarged by the roller 35 . That is, in the state where the outer peripheral surface of the roller 35 rotatably supported on the front end of the pressing arm 36 is strongly pressed against the inner peripheral surface of the axially outer half of the third intermediate material 27a, the roller 35 is moved relative to the third intermediate member 27a. The intermediate material 27a is rotated. Moreover, by relatively displacing the third intermediate material 27a and the pressing arm 36 in the axial dire...

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PUM

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Abstract

A method of producing a raceway ring member for a rolling bearing unit. A circular tube-like blank portion having a smaller diameter than a circular tube-like portion is formed, the blank portion is expanded in diameter to form the circular tube-like portion, and a raceway surface is formed on either of the inner and outer peripheral surfaces of the circular tube-like portion so as to extend in the circumferential direction of the peripheral surface.

Description

technical field [0001] The present invention relates to a method for producing raceway ring members of various rolling bearing units by plastically deforming metal materials such as carbon steel. The raceway ring member has a cylindrical portion in a part of its axial direction, and the raceway surface is provided over the entire circumference of either one of inner and outer peripheral surfaces of the cylindrical portion. Background technique [0002] The wheels of the automobile and the rotating member for braking are supported by the rolling bearing unit so as to be rotatable with respect to the suspension device. When the car is turning, a large moment is applied to such a rolling bearing unit for supporting the wheel. Therefore, in order to ensure the stability during cornering, a rolling bearing unit having high moment rigidity is required. For this reason, a rolling bearing unit for supporting a wheel is generally used in which rolling elements are arranged in doubl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60B35/02F16C19/18F16C33/64
CPCF16C19/186F16C33/64F16C2326/02F16C19/184F16C2240/80Y10T29/49689Y10T29/49643
Owner NSK LTD