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Experimental study of residual stresses of Cam produced by heat treatment and grinding processes

机译:热处理和研磨过程产生凸轮残余应力的实验研究

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摘要

The excessive residual stresses caused by heat treatment and grinding processes is one of the main challenges for Cam manufacturing, because they will lead to delayed cracks and reduce the fatigue life of Cam. Experimental studies are one of the essential ways to keep residual stresses at a reasonable value. Thus, orthogonal and single-factor experiments are carried out to explore the effect of heat treatment and grinding processes on the residual stresses of the Cam. The heat treatment processes include quenching temperature, tempering temperature, and tempering holding time. The grinding process includes grinding speed and feed speed. Besides, the superimposed residual stresses produced by heat treatment and grinding processes are analyzed. The results show that the heat treatment and grinding processes produce compressive residual stresses. The heat treatment process combined with the grinding process increases the superimposed residual stress. In addition, the critical factor for the distribution of the final stresses on the Cam surface is the grinding process, and the grinding speed plays the most important role. Therefore, in order to optimize the Cam machining processes to control the residual stresses, the optimization sequence is grinding speed, quenching power, and tempering temperature. The processes to obtain the least stress are as follows: 128kW of quenching power, 200 degrees C of tempering temperature and 8h of tempering time.
机译:引起的热处理和磨削加工工序过多残余应力是对凸轮的制造的主要挑战之一,因为它们会导致延迟裂纹和减少凸轮的疲劳寿命。实验研究是保持残余应力在合理值的基本方式之一。因此,正交和单因素进行了实验探索热处理对凸轮的残余应力的影响,并研磨工艺。该热处理方法包括淬火温度,回火温度和回火保持时间。研磨过程包括研磨速度和进料速度。此外,通过热处理和研磨过程中产生的叠加的残余应力进行了分析。结果表明,在热处理和研磨过程产生的压缩残余应力。热处理工序与磨削工艺相结合提高了叠加的残余应力。此外,对于最终应力的凸轮表面上分布的关键因素是磨削过程中,和研磨速度起着最重要的作用。因此,为了优化凸轮加工过程来控制残余应力时,最优化序列被磨削速度,淬火功率和回火温度。的处理,以获得至少应力如下:淬火功率128KW,回火温度和回火时间的8H的200摄氏度。

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