Supercharge Your Innovation With Domain-Expert AI Agents!

Softening method for CSS-42l gear steel forging stock

A gear steel and forging billet technology, which is applied in the softening field of CSS-42L gear steel forging billet, can solve problems such as difficult machining and difficult machining

Active Publication Date: 2017-05-31
HARBIN DONGAN ENGINE GRP
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hardness of forgings of this material after sub-temperature annealing at 680 °C is as high as HRC40, and machining is extremely difficult, especially for large and complex structural cavity parts.

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0015] The forging billet of a hollow gear shaft used in an aviation transmission system is made of CSS-42L gear steel. The forging of this material has a hardness of up to HRC45.1 after sub-temperature annealing at 680°C. In order to ensure its machining requirements, the forging billet was softened. Proceed as follows:

[0016] 1. Carry out high-temperature austenitization of the CSS-42L billet at a temperature of 1110°C. After holding for 1 hour, carry out oil quenching, and the temperature of the quenching oil bath is 55°C;

[0017] 2. After oil quenching, carry out stress relief treatment at 150°C, and the stress relief time is 2 hours;

[0018] 3. After the stress is eliminated, mechanical cutting is performed.

[0019] Through the above method, the hardness of the CSS-42L forging billet is reduced from the previous HRC45.1 to HRC30.3, and the metal cutting performance of the material can be greatly improved.

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 relates to a softening method for a CSS-42l gear steel forging stock. According to the softening method, a material is entirely in an under-cooled austenite state by treatments of high-temperature austenization, oil quenching and stress elimination; the under-cooled austenite belongs to a soft structure which is relatively low in hardness, so the hardness of CSS-42L gear steel can be greatly reduced to HRC 28-35, and the requirements of machining are satisfied.

Description

technical field [0001] The invention relates to a softening method, in particular to a softening method for a CSS-42L gear steel forging billet. Background technique [0002] With the gradual increase in the load capacity of aircraft, people put forward extremely high requirements for the comprehensive mechanical properties and temperature resistance of aviation parts. The United States took the lead in developing the CSS-42L third-generation gear steel. A notable feature of this steel is that it has good high-temperature red hardness and excellent high-temperature tempering resistance, and can serve for a long time below 427 ° C. However, many of its metallurgical properties are domestic Not mastered yet. [0003] Traditional gear steel forging blanks are usually quenched and tempered before machining to obtain appropriate cutting hardness. CSS-42L third-generation gear steel belongs to low-carbon high-alloy martensitic precipitation-hardening stainless steel with good ha...

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): C21D1/18C21D1/773C21D9/32
CPCC21D1/18C21D1/773C21D9/32C21D2261/00
Inventor 孙振淋辛玉武周动林刘慧郝博健辛昕金玉亮曾西军徐奉鑫崔学威
Owner HARBIN DONGAN ENGINE GRP
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com