Optimization Design of Quenching and Tempering Parameters for Crankshaft Based on Response Surface Methodology
Yongkang Wang1, Jie Tang1, Jianzhi Chen1
1School of Mechanical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China.
Materials (Basel, Switzerland)
|August 10, 2024
Summary
Optimizing crankshaft heat treatment involves balancing cooling speed, tempering temperature, and holding time. This study identified optimal parameters, improving straightness, surface stress, and martensite content for better crankshaft performance.
Area of Science:
- Materials Science
- Mechanical Engineering
- Metallurgy
Background:
- Crankshaft heat treatment optimization often lacks multifactorial parameter consideration.
- This leads to suboptimal heat treatment designs and performance.
Purpose of the Study:
- Investigate the influence of cooling speed, tempering temperature, and holding time on crankshaft straightness, residual stress, and martensite content.
- Determine optimal heat treatment parameters for improved crankshaft performance.
Main Methods:
- Utilized the response surface method to analyze the relationships between process parameters and performance indexes.
- Conducted experiments to validate the influence mechanisms and identify optimal settings.
Main Results:
- Cooling speed had the greatest influence, followed by holding time, then tempering temperature.
- Optimal parameters: 1.4x cooling oil speed, 555°C tempering, 6h holding time.
- Achieved 9.9% reduction in straightness, 6.7% increase in surface stress, and 7.2% increase in martensite content.
Conclusions:
- Established the significant impact of individual and combined heat treatment parameters on crankshaft quality.
- Provided optimized process parameters for enhanced crankshaft straightness, residual stress, and martensite content.
- Offers a data-driven approach for future crankshaft heat treatment process optimization.
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