高速铣削高强高硬钢加工表面残余应力研究

Study on the Surface Residual Stress of High Hardness and Strength Alloy Steel in High Speed Milling

研究高速铣削高强高硬钢时,铣削参数与加工表面残余应力的关系.进行了高速铣削高强高硬钢时的切削温度、切削力实验研究,分析了切削参数对平均切削温度、平均切削力的影响规律,分析了切削力、切削热以及由其引起的微观组织变化对加工表面残余应力的影响.结果表明,高速铣削高强高硬钢时,加工表面产生明显的残余应力.在所选用切削参数范围内,皆产生残余压应力;切削力以及切削热引起的金相组织变化是产生残余压应力的主要原因;在所选用的切削范围内,随着切削速度的增加,加工残余压应力增大,残余应力的影响深度增大.

Investigates the relationship between the milling parameters and the surface residual stress in high speed milling the high hardness and strength alloy steels. Experiments on the cutting temperature and cutting force of high hardness and strength alloy steels were carried out in high speed milling. Rules of influence of milling parameters on the average milling temperature and milling force were studied, and empirical formulas of the temperature and milling force with the milling parameters were established, and the effects of cutting force and cutting temperature and the microstrueture caused by the cutting temperature on the residual stress were also analyzed. The results show that the surface residual stress exists obviously in high speed milling the high hardness and strength alloy steels. Compressive residual stress is generated in the selected parameters range, and the main reason that the compressive residual stress is generated is the cutting force and the microstructures changes of the degenerative layer caused by the cutting heat. And with the increase of the cutting speed, the residual stress becomes larger and the depth of the metal with residual stress becomes larger too.