CN104388660A

CN104388660A - Rolling bearing heat treatment technique

Info

Publication number: CN104388660A
Application number: CN201410617014.8A
Authority: CN
Inventors: 钱文明
Original assignee: Wuxi Baishun Machinery Factory
Current assignee: Wuxi Baishun Machinery Factory
Priority date: 2014-11-06
Filing date: 2014-11-06
Publication date: 2015-03-04

Abstract

The invention provides a rolling bearing heat treatment technique. The inner ring or outer ring working process comprises the following steps: turning a bar or tube, carrying out heat treatment, grinding, lapping or polishing, carrying out end inspection on the part, and carrying out antirust treatment. The heat treatment technique is differential heat treatment, the heat treatment component is the outer ring, and the integral heat treatment is used for hardening and tempering: the bearing outer ring is subjected to primary quenching and tempering in the heating furnace; the tempering temperature is 500-550 DEG C, the holding time is 3 hours, the cooling mode is oil cooling; and when the integral hardness of the bearing outer ring reaches HRC 25-40, tempered sorbite is obtained. The rolling bearing heat treatment technique has the advantages of high product quality, simple process and low cost.

Description

A kind of rolling bearing thermal treatment process

Technical field

The present invention relates to a kind of rolling bearing thermal treatment process, belong to machinery manufacturing technology field.

Background technology

Rolling bearing improves for the railway, rolling mill bearing etc. that bear heavy shock loads work-ing life, when using after M quenching, main failure forms is: inner sleeve cracking during assembling, being hit in use procedure, outer ring flange falls block, inner ring is cracked, and isothermal quenching bearing is because impelling strength is good, bearing stress, inner sleeve cracking when no matter assembling, or overcoat rib falls block, inner sleeve fracture prone reduces greatly in use procedure, and the rim stress that can reduce roller is concentrated.Bearing should have the characteristics such as long lifetime, high precision, high rigidity, low noise, high-wearing feature.At construction machinery industry, as mechanical means such as fork truck, stacker and excavators, also require to withstand shocks load.The progressive formation of hardness makes bearing have surge capability when being hit.Adopt medium carbon steel to replace bearing steel to produce and can reach more preferably effect, the requirement both having met client again reduces cost.

Summary of the invention

The invention provides a kind of rolling bearing thermal treatment process, wear resistance and radial and axial supporting capacity can be ensured, and heart portion and outer diameter face are softs, both ensure that toughness, can prevent again outer diameter face from injuring friction track.

For solving above technical problem, the invention provides following technical scheme: a kind of thermal treatment process of rolling bearing, described rolling bearing comprises outer ring, inner ring, rolling body and retainer, rolling body is steel ball or roller, and the course of processing of described inner ring or outer ring is as follows: bar or materials in the tube-Vehicle Processing-thermal treatment-mill processing-lappingout or polishing-part inspection eventually-antirust; Described thermal treatment process is partial heat treatment, and heat processing unit is outer ring, and complete heat treatment is modified: bearing outer ring is first modifier treatment in process furnace, and tempering temperature is 500-550 DEG C; Soaking time: 3 hours; The type of cooling: oil cooling; Make bearing outer ring integral hardness reach HRC25-40, obtain tempered sorbite; The course of processing of rolling bearing retainer is as follows: plate → shearing → stamping-out → stamping → shaping and precision work → pickling or shot-peening or optical crosstalk → inspection at end → antirust, packaging; The course of processing of rolling body is as follows: go here and there endless belt and buffing after bar Vehicle Processing or wire rod cold-heading, and-------string soft spots-------------fine grinding external diameter----grind external diameter eventually----examine grouping eventually----antirust, to pack-corase grind end face-corase grind external diameter by-whole face grinding in-thermal treatment;

Further, the thermal treatment position of described outer ring is outer ring raceway or cycle surface, type of heating is the heating of electromagnetic induction local surfaces, induction loop presses close to bearing outer ring inwall or end face, the profile of induction loop is consistent with bearing outer ring inwall raceway or end face, the high frequency electric source of corresponding frequencies is selected according to the requirement of product case depth, high-frequency current is passed into induction coil, induction heating is carried out to outer ring raceway or end face, after heating certain hour reaches quenching temperature, bearing outer ring falls into quenchant immediately and cools, by regulating heat-up time, air cooling time, relation between heat transfer time and output rating controls the degree of depth of hardened layer and transition layer, hardened layer hardness > HRC58, by the outside degree of depth 4mm of raceway, zone of transition 4-6mm, induction heating temperature: 800 ~ 850 DEG C, soaking time: 20 ~ 30 minutes, the type of cooling: water-cooled, after bearing outer ring induction quenching, timely tempering, stabilizing tissue, tempering temperature 180 DEG C ~ 200 DEG C, soaking time 40 ~ 50 minutes, the type of cooling is air-cooled.

This rolling bearing thermal treatment process that the present invention relates to, quality product is high, and technique is simple, and cost is low.

Embodiment

A kind of thermal treatment process of rolling bearing, described rolling bearing comprises outer ring, inner ring, rolling body and retainer, rolling body is steel ball or roller, and the course of processing of described inner ring or outer ring is as follows: bar or materials in the tube-Vehicle Processing-thermal treatment-mill processing-lappingout or polishing-part inspection eventually-antirust; Described thermal treatment process is partial heat treatment, and heat processing unit is outer ring, and complete heat treatment is modified: bearing outer ring is first modifier treatment in process furnace, and tempering temperature is 500-550 DEG C; Soaking time: 3 hours; The type of cooling: oil cooling; Make bearing outer ring integral hardness reach HRC25-40, obtain tempered sorbite; The course of processing of rolling bearing retainer is as follows: plate → shearing → stamping-out → stamping → shaping and precision work → pickling or shot-peening or optical crosstalk → inspection at end → antirust, packaging; The course of processing of rolling body is as follows: go here and there endless belt and buffing after bar Vehicle Processing or wire rod cold-heading, and-------string soft spots-------------fine grinding external diameter----grind external diameter eventually----examine grouping eventually----antirust, to pack-corase grind end face-corase grind external diameter by-whole face grinding in-thermal treatment;

The thermal treatment position of described outer ring is outer ring raceway or cycle surface, type of heating is the heating of electromagnetic induction local surfaces, induction loop presses close to bearing outer ring inwall or end face, the profile of induction loop is consistent with bearing outer ring inwall raceway or end face, the high frequency electric source of corresponding frequencies is selected according to the requirement of product case depth, high-frequency current is passed into induction coil, induction heating is carried out to outer ring raceway or end face, after heating certain hour reaches quenching temperature, bearing outer ring falls into quenchant immediately and cools, by regulating heat-up time, air cooling time, relation between heat transfer time and output rating controls the degree of depth of hardened layer and transition layer, hardened layer hardness > HRC58, by the outside degree of depth 4mm of raceway, zone of transition 4-6mm, induction heating temperature: 800 ~ 850 DEG C, soaking time: 20 ~ 30 minutes, the type of cooling: water-cooled, after bearing outer ring induction quenching, timely tempering, stabilizing tissue, tempering temperature 180 DEG C ~ 200 DEG C, soaking time 40 ~ 50 minutes, the type of cooling is air-cooled.

Embodiment of the present invention does not form the restriction to the application's scope; within every spirit in the present invention's design and principle, any amendment that one of skill in the art can make, equivalent to replace and improvement etc. all should be included within protection scope of the present invention.

Claims

1. the thermal treatment process of a rolling bearing, described rolling bearing comprises outer ring, inner ring, rolling body and retainer, rolling body is steel ball or roller, it is characterized in that: the course of processing of described inner ring or outer ring is as follows: bar or materials in the tube-Vehicle Processing-thermal treatment-mill processing-lappingout or polishing-part inspection eventually-antirust; Described thermal treatment process is partial heat treatment, and heat processing unit is outer ring, and complete heat treatment is modified: bearing outer ring is first modifier treatment in process furnace, and tempering temperature is 500-550 DEG C; Soaking time: 3 hours; The type of cooling: oil cooling; Make bearing outer ring integral hardness reach HRC25-40, obtain tempered sorbite; The course of processing of rolling bearing retainer is as follows: plate → shearing → stamping-out → stamping → shaping and precision work → pickling or shot-peening or optical crosstalk → inspection at end → antirust, packaging; The course of processing of rolling body is as follows: go here and there endless belt and buffing after bar Vehicle Processing or wire rod cold-heading, and-------string soft spots-------------fine grinding external diameter----grind external diameter eventually----examine grouping eventually----antirust, to pack-corase grind end face-corase grind external diameter by-whole face grinding in-thermal treatment.

2. the thermal treatment process of a kind of rolling bearing according to claim 1, it is characterized in that, the thermal treatment position of described outer ring is outer ring raceway or cycle surface, type of heating is the heating of electromagnetic induction local surfaces, induction loop presses close to bearing outer ring inwall or end face, the profile of induction loop is consistent with bearing outer ring inwall raceway or end face, the high frequency electric source of corresponding frequencies is selected according to the requirement of product case depth, high-frequency current is passed into induction coil, induction heating is carried out to outer ring raceway or end face, after heating certain hour reaches quenching temperature, bearing outer ring falls into quenchant immediately and cools, by regulating heat-up time, air cooling time, relation between heat transfer time and output rating controls the degree of depth of hardened layer and transition layer, hardened layer hardness > HRC58, by the outside degree of depth 4mm of raceway, zone of transition 4-6mm, induction heating temperature: 800 ~ 850 DEG C, soaking time: 20 ~ 30 minutes, the type of cooling: water-cooled, after bearing outer ring induction quenching, timely tempering, stabilizing tissue, tempering temperature 180 DEG C ~ 200 DEG C, soaking time 40 ~ 50 minutes, the type of cooling is air-cooled.