Thin-walled part producing method, bearing raceway ring, thrust needle roller bearing, rolling bearing raceway ring producing method, rolling bearing raceway ring, and rolling bearing

Abstract

A method of producing thin-walled parts is characterized in that after being heated, a thin-walled part (1) is subjected to either hardening or isothermal transformation while being pressed in a mold (12a, 12b) with the latter being used as a cooling medium. This makes it possible to provide a method of producing thin-walled parts which can be prevented from warping or deforming during heat treatment and which have a uniform and high hardness; a bearing raceway ring; a thrust needle roller bearing; a method of producing rolling bearing raceway rings; a rolling bearing raceway ring; and a rolling bearing.

Description

(1) Technical field [0001] The present invention relates to a thin-walled part manufacturing method, a bearing ring, a thrust needle roller bearing, a rolling bearing bearing ring manufacturing method, a rolling bearing bearing ring and a rolling bearing, and in particular to a bearing ring of a thrust needle roller bearing and a thin-walled bearing ring during heat treatment. A method for manufacturing thin-walled parts that are prone to large deformations and do not undergo grinding processing after heat treatment. (2) Background technology [0002] In the past, the bearing ring of thrust needle roller (needle) bearing and the bearing ring of shell-type radial needle roller bearing have been adopted to low-carbon SPCC (JIS: cold rolled steel plate) material and SCM415 material (JIS: chromium molybdenum steel). ) Carburized for a short period of time to harden the required hardness of the surface layer. It is also made by heating and quenching the whole medium to high carbon ste...

AI Technical Summary

Problems solved by technology

[0010] In the conventional method of carburizing the low-carbon SPCC material and SCM415 material for a short time to harden the parts that require hardness on the surface, although the material has excellent processability, the heat treatment uses carburization, so it is a heat treatment that is out of the production line. , Due to grain boundary oxidation during carburizing and warpage and deformation during quenching, there are problems in life and strength instability

[0011] Medium to high carbon steel such as SK5 material has the problem of high hardness of the raw material, which makes it difficult to process. The method of heating and quenching in the atmosphere furnace as a whole has the same deformation caused by uneven cooling as carburizing.

Although slow and uniform cooling (for example, cooling by blowing inert gas) is performed on these integrally quenched parts, it is difficult to eliminate deformation. In order to reduce warpage, tempering for warpage correction is required.

[0012] On the other hand, even if it is a high-frequency heating part, as long as air and water are used as the quenching medium in the process of high-frequency heating-water quenching, the deformation during quenching cannot be avoided no matter how slowly it is cooled, especially when water is used. Fluid deterioration and consumption requiring fluid replacement

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