刀具形状及工艺参数对模具钢NAK80高速切削过程的影响  

Effect of tool geometry and process parameters on high-speed cutting process of NAK80 die steel

作　　者：王义强[1] 闫国琛 王晓军[1] 邱红钰[1] 

机构地区：[1]浙江大学宁波理工学院,浙江宁波315100 [2]山西平阳重工机械有限责任公司,山西侯马043003

出　　处：《兵器材料科学与工程》2015年第2期5-8,共4页Ordnance Material Science and Engineering

基　　金：国家科技重大专项(2012ZX04011021);浙江省自然科学基金(Y1110708);宁波市自然科学基金(2013A610152)

摘　　要：通过建立等效二维高速切削有限元模型,对影响模具钢NAK80切削过程的因素进行研究。通过Johnson-Cook材料本构方程描述材料特性,切屑的分离采用基于断裂力学的几何—物理分离准则,用修正的库伦摩擦定律表征前刀面与工件的接触状态。对不同刀具前角、切削速度、切削深度下的高速切削过程进行仿真,分析不同参数下切屑形态、切削力与切削温度的变化情况。结果表明,合理的选择刀具前角、切削速度与切削深度,可以优化切屑形态,降低切削力与切削温度,对切削过程的优化具有一定的指导意义。Based on 2D equivalent finite element model of high-speed cutting, the factors influencing cutting process of NAK80 die steel were investigated. The material properties were described by Johnson-Cook constitutive equation. Chip separation was determined by the geometrical and physical separation criterion based on fracture mechanics. Contact condition between the rake surface and the workpiece was represented by the modified coulomb law. The high-speed cutting process was simulated under different rake angle, cutting speed and cutting depth. Changes of chip morphology, cutting force and cutting temperature under different parameters were analyzed. The results show that reasonable selection of tools rake angle, cutting speed and cutting depth may optimize the chip morphology, reduce the cutting force and cutting temperature. This research has certain guiding significance for the optimization of cutting proeess.

关 键 词：高速切削 有限元仿真 切屑形态 切削力 切削温度 

分 类 号：TG543[金属学及工艺—金属切削加工及机床]