GB/T 33878-2017 in English

Interpretation of GB/T 33878-2017 National Standard of the People's Republic of China

Background of Standard Formulation and Analysis of Technical Evolution

GB/T 33878-2017 "Principles of Process Preparation for Cross-Wedge Rolled Steel Parts" is an important national standard in my country in the field of cross-wedge rolling technology. This standard is based on years of practical experience and technical accumulation, combined with the development trend of advanced manufacturing technologies at home and abroad. With the increasing demand for high-performance and high-precision rolled products in the steel industry, the cross-wedge rolling process, as an efficient forming technology, has been widely used in the fields of automobiles, aerospace, etc.

Principles of Process Preparation

According to the requirements of the standard, the process preparation of cross-wedge rolled steel parts needs to comprehensively consider factors such as production process, equipment status, and customer quality requirements. The following are the core points of process preparation:
- Blanking: Select appropriate blanking equipment (such as shearing machine, band saw machine)
- Heating: It is recommended to use medium frequency induction heating, and strictly control the heating temperature and time
- Rolling: Select a wedge cross rolling mill of appropriate specifications according to the diameter and length of the product
- Hot straightening and cold straightening: Ensure temperature drop control and residual stress treatment
- Surface cleaning: Use shot blasting or sand blasting to remove oxide scale

Key Parameter Comparison Table

Implementation suggestions

To ensure the effective implementation of the standard, it is recommended that manufacturers:

• Establish a complete quality control system in accordance with the requirements of GB/T 32258
• Adopt non-destructive testing technologies such as ultrasonic testing
• Select appropriate heat treatment methods (normalizing, quenching and tempering, etc.) according to product characteristics
• Optimize mold design to reduce production defects