GB/T 39430-2020 in English
VALIDSpecifications for the blanks of high reliability gears
- Issued on:2020-11-19
- Implemented on:2021-06-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$243.00
| Standard No: | GB/T 39430-2020 |
| Document status: | VALID |
| Title in English: | Specifications for the blanks of high reliability gears |
| Title in Chinese: | 高可靠性齿轮毛坯技术要求 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2020-11-19 |
| Implemented on: | 2021-06-01 |
| ICS Classification: | 21.200-Gears |
| Chinese Classification: | J17-Gear and gear drive |
| Professional Classification: | GB-National Standard |
| Related Keywords: | aviation gears industrial gear requirements test methods
high reliability gears introduction analysis aviation gears industrial gears comparison different reliability requirements |
| Related Topics: | efficient and reliable
Reliability Quality Requirements GBT39430 GB/T 39430-2020 Blank inspection Technology required for paper roughening |
《GB/T 39430-2020高可靠性齿轮毛坯技术要求》由TC52（全国齿轮标准化技术委员会）归口，主管部门为国家标准化管理委员会。
Introduction
Analysis of the core content of the standard
The GB/T39430-2020 standard systematically specifies the technical requirements for the entire life cycle of high-reliability gear blanks, focusing on the following technical dimensions:
- Material system: Chemical composition control requirements for 18 special steels
- Process control: Special smelting processes such as electroslag remelting and vacuum degassing
- Quality inspection: Three-level classification of ultrasonic flaw detection acceptance standards
- Application differentiation: Differentiated requirements for aviation gears and industrial gears
Comparison of key technical indicators
| Inspection items | Requirements for aviation gears | Industrial gear requirements | Test methods |
|---|---|---|---|
| Non-metallic inclusions | Class A≤1.0 (double vacuum) | Class A≤1.5 | GB/T10561 |
| Ultrasonic flaw detection | GB/T4162 AA grade | Tooth area Φ1.2mm equivalent | JB/T5000.15 |
| Gas content | Oxygen≤0.0015% | Hydrogen≤0.0002% | GB/T223 |
| Forging ratio | According to bar standard | Mold casting ingot ≥4:1 | Metallographic inspection |
Material selection and process control points
Typical material application scenarios
The 9310 steel and 18CrNiMo7-6 steel that are specially specified in the standard are typical representatives:
Aerospace gear case
9310 steel adopts the vacuum induction + vacuum consumable dual process, requiring the oxygen content to be ≤15ppm and the hardenability bandwidth J9.5mm=32-41HRC, which increases the fatigue life by more than 30% compared with the traditional electroslag process.
Industrial Gear Case
In wind power gearbox applications, 18CrNiMo7-6 steel is required to have a hardness of 179-229HBW after normalizing and tempering, and a terminal hardenability J15mm=54-45HRC to ensure the core strength of large modulus gears.
Recommendations for the implementation of the standard
Key points of process control
- Establish a smelting furnace number traceability system, with special attention to the parent material record of electroslag remelting steel
- Use infrared thermal imaging technology to monitor the uniformity of forging temperature
- Develop a digital twin model to predict the amount of heat treatment deformation
Responses to common problems
In response to the dendritic crystal residue problem that is prone to occur during the implementation of the standard, it is recommended that:
- Optimize the mold taper of electroslag remelting (recommended 12-15°)
- Control the final forging ratio ≥6:1
- Use isothermal normalizing process to refine the grains
Technology Evolution Analysis
Compared with traditional gear blank standards, the main breakthroughs of GB/T39430-2020 are:
- For the first time, the control requirement of the total amount of five harmful elements ≤0.040% is clarified
- Special acceptance standards for tooth area flaw detection are introduced
- Establish a ME/MQ grading system to correspond to different reliability requirements
- Standardize the sampling method of special test materials for aviation gears
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