Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Stress-relief annealing technology for steel bearing retainer

A technology for stress-relieving annealing and bearing cages, used in manufacturing tools, heat treatment equipment, furnaces, etc., can solve the problems of low overall strength of the cage, poor plastic toughness of the cage, and high surface stress, and achieve high strength and eliminate residual stress. , The effect of high machining accuracy

Inactive Publication Date: 2017-08-11
AVIC HARBIN BEARING
View PDF4 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the problems of poor plastic toughness of the cage, low overall strength of the cage and poor processing accuracy of the existing 40CrNiMoA steel cage caused by high surface stress during machining, and further provides a Stress Relief Annealing Process for Steel Bearing Cage

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Stress-relief annealing technology for steel bearing retainer
  • Stress-relief annealing technology for steel bearing retainer
  • Stress-relief annealing technology for steel bearing retainer

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0017] Specific implementation mode one: combine Figure 1~4 Describe this embodiment, a kind of steel bearing cage stress relief annealing process, it comprises the following steps:

[0018] Step 1. Use alcohol to clean the cage, remove the surface cutting fluid, and then wipe the cage clean;

[0019] Step 2. Put the wiped and cleaned cage into the vacuum gas quenching furnace, and set the vacuum stress relief annealing process, specifically: the vacuum degree reaches 3×10 -4 After mbar, the temperature starts to rise, (after the temperature rises, the vacuuming action is maintained but the specific vacuum value is not considered), the temperature rise rate is 8-20°C / min, when the temperature of the cage reaches 550±5°C, the temperature is kept constant, and the constant temperature time is 120±5min, and then through Enter the nitrogen gas to cool the cage and release it from the furnace (check the appearance quality of the cage after it is released from the furnace, mainly ...

specific Embodiment approach 2

[0020] Specific implementation mode two: combination Figure 1~4 To describe this embodiment, the cage is a tempered 40CrNiMoA semi-finished cage, and the tempering temperature is 590°C to 630°C. With such a design, at this tempering temperature, the cage has excellent serviceability and processing performance, and can implement the subsequent stress relief annealing process at 550±5°C. After quenching and tempering treatment, through the end face, outer circle, inner diameter turning, and drilling and milling processes, there is a large stress on the surface of the cage, and the stress relief annealing is carried out according to the annealing process of the specific implementation mode 1 to fully remove the machining stress on the surface of the cage (see image 3 ), improve the stability of subsequent machining performance, and at the same time maintain the original performance of the guarantee cage (see figure 2 , Figure 4 ). Other compositions and connections are the...

specific Embodiment approach 3

[0021] Specific implementation mode three: combination Figure 1~4 To illustrate this embodiment, the pressure of the nitrogen gas introduced in step 2 is 1-1.5 bar. With this design, the temperature is fully cooled, and the cooling rate is controlled to ensure that the accuracy of the cage is not damaged during stress relief annealing, see Table 1. Other compositions and connections are the same as those in Embodiment 1 or Embodiment 2.

[0022] Specific implementation mode four: combination Figure 1~4 To illustrate this embodiment, in step 2, nitrogen gas is passed through to cool the cage to 43°C or below and then released from the furnace. Other compositions and connections are the same as those in the third embodiment.

[0023] Table 1 Changes in surface accuracy before and after stress relief

[0024]

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a stress-relief annealing technology for a steel bearing retainer, and relates to a heat treatment machining method. The stress-relief annealing technology solves the problems that due to the fact that surface stress generated in the machining process of an existing 40CrNiMoA steel bearing retainer is high, the plasticity and toughness of the retainer are poor, the overall strength of the retainer is low and machining precision is also poor. The technology includes the specific steps that (1) ethyl alcohol is used for cleaning the retainer, surface cutting fluid is removed and then the retainer is rubbed clean; and (2) the retainer rubbed clean is put into a vacuum gas hardening furnace, and the vacuum stress-relief annealing technology is set; and the step specifically comprises the contents that warming begins after the vacuum degree reaches 3x10<-4>mbar, the warming rate is 8-20 DEG C / min, constant temperature treatment is conducted when the retainer temperature reaches 550+ / -5 DEG C, the constant temperature time is 120+ / -5min, and then nitrogen is connected in so that the retainer can be discharged out of a furnace after being cooled. The stress-relief annealing technology for the steel bearing retainer is used for stress-relief annealing of the bearing retainer.

Description

technical field [0001] The invention relates to a heat treatment processing method, in particular to a stress relief annealing process for a steel bearing cage. Background technique [0002] The bearing cage is one of the four major parts of the bearing. With the improvement of the life of the bearing, the performance of the bearing cage is also higher and higher. Compared with the traditional copper alloy cage, the 40CrNiMoA steel cage It has been widely used for its excellent mechanical properties. For high-precision cage processing, after multiple machining processes, there is high tensile stress on the surface, which affects the plastic toughness of the cage, and the overall strength of the cage is low. Cracks often appear during continuous processing, which seriously affects the quality and processing accuracy of the cage. , reducing bearing reliability. Contents of the invention [0003] The present invention aims to solve the problems of poor plastic toughness of ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C21D1/30C21D1/773C21D9/40
CPCC21D1/30C21D1/773C21D9/40
Inventor 刘明胡北闫国斌安敏刘秀莲吴玉成周淑梅刘明阳
Owner AVIC HARBIN BEARING
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com