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

A technology for thrust needle roller bearings and thin-walled parts, applied in the field of thin-walled parts manufacturing, can solve problems such as uneven cooling, slow cooling, difficult processing, etc., and achieve the effect of clean working environment, uniform processing, and stable quality

Inactive Publication Date: 2006-11-15
NTN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 furna...

Method used

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  • 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
  • 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
  • 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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] Using medium carbon steel S53C as a raw material, a thrust needle roller bearing ring (NTN trade name: AS1112) with an outer diameter of 60mm, an outer diameter of 85mm, and a wall thickness of 1mm was produced by punching the plate.

[0081] Using a high-frequency induction heating device (80kHz), while rotating the above-mentioned bearing ring, a predetermined current is applied to the induction coil close to one side for induction heating ( figure 1 ). At this time, heating is performed slowly so that the entire temperature becomes uniform (about 900°C). After that, the bearing ring was installed in an iron upper and lower pressurized mold with a heat capacity much larger than that of the bearing ring, and immediately pressed with a prescribed pressure by pressurizing, and at the same time, the pressurized mold was used to cool the bearing ring to transform and harden ( figure 2 ). The relationship between hardness and microstructure was investigated by changing the mo...

Embodiment 2

[0098] Used as a raw material: medium carbon steel S53C; and improved quenching characteristics, through slow cooling to obtain sufficient hardness of composite steel (0.7 mass% C-1.0 mass% Si-0.6 mass% Mn-1.5 mass% Cr-0.3 mass% Mo ).

[0099] A thrust needle roller bearing ring (NTN product name: AS1112) with an outer diameter of 60 mm, an outer diameter of 85 mm, and a wall thickness of 1 mm was produced by rotating cutting using these raw materials.

[0100] Using a high-frequency induction heating device (80kHz), while rotating the above-mentioned bearing ring, a predetermined current is applied to the induction coil close to one side for induction heating ( figure 1 ). At this time, heating is performed slowly so that the entire temperature becomes uniform (about 900°C). After that, the bearing ring was installed in an iron upper and lower pressurized mold with a heat capacity much larger than that of the bearing ring, and immediately pressed with a predetermined pressure by...

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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...

Claims

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Application Information

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IPC IPC(8): C21D9/40F16C19/30C21D1/18F16C19/44F16C19/48F16C33/62F16C33/64
Inventor 前田喜久男片冈裕树笹部光男
Owner NTN CORP
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