切削参数对高速铣削超高强度钢切屑形态的影响

在不同切削参数下,对32Cr3NiMoVA超高强度钢高速铣削过程中产生的切屑形态进行试验,采用VHX-500F型光学显微镜对切屑的自由表面和后表面进行分析.试验结果表明,在每齿进给量0.2mm/r、切削深度0.5mm和切削速度200~1 000m/min的范围内,形成适宜切削的螺旋状切屑,并且随着速度的增加,螺旋状切屑的直径先减少后趋于稳定值,切屑的锯齿化程度随切削速度、每齿进给量和切削深度的增加而增大.

Experiment Research on Chip Morphologies of 32Cr3NiMoVA Ultra-High-Strength Steel Over a Variety of Cutting Parameters

An experimental investigation of chip morphologies in high-speed dry milling of 32Cr3NiMoVA steel was conducted over a variety of different cutting parameters.The free surface and the back surface of the chip were investigated through VHX-500F optical microscope.The experimental results showed that，with 0.2 mm/r feed per tooth,0.5mm cutting depth and 200 to 1 000 m/min cutting speed，a suitable cutting chip of helical chip was formed;and with the cutting speed increased，the diameter of the helical chip reduced at first but eventually stabilized at a relatively constant value.The degree of chip serration was more pronounced and evident with the increase in cutting speed，feed per tooth and cutting depth.The variation in chip serration should be attributed to the reinforcement of coupled thermo-mechanical behavior in the cutting process with the increase in machining parameters.