Stress analysis and process parameters optimization of circular saw blade during quenching process
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摘要: 针对φ600 mm圆锯片淬火后变形大、影响圆锯片使用性能的问题,基于数值计算法分析其淬火残余应力的分布特性。分析结果表明:在整个淬火过程中,圆锯片淬火有效残余应力表现为拉应力;淬火结束后,中心孔附近的应力最大,其次为外圆齿附近的应力,中心孔与外圆齿中间位置的应力最小。以淬火奥氏体形成温度和保温时间为优化变量,淬火残余应力为优化目标函数,用响应曲面优化法对圆锯片淬火参数进行优化。优化结果表明:当奥氏体形成温度837℃,保温时间5 min时,最低残余应力为199 MPa。Abstract: Aiming at the problem that the deformation of the φ600 mm circular saw blade is large after quenching and thus affecting the performance of saw blade, the distribution characteristics of the quenching residual stress are analyzed based on the numerical calculation method. The results show that the effective residual stress of the circular saw blade is tensile stress during the whole quenching process. After quenching, the stress near the center hole is the biggest, followed by that near the outer tooth, and the stress in the middle is the smallest.The austenite forming temperature and holding time are selected as the optimizing variables, and the quenching residual stress as the target function. The response surface optimization method is used to optimize the quenching parameters of the circular saw blade. The results show that the minimum residual stress is 199 MPa when the austenite formation temperature is 837℃ and the holding time is 5 min.
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Key words:
- circular saw blade /
- quenching /
- residual stress /
- response surface method
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