摘要
根据切削过程中材料的塑性流动状态和刀—屑的摩擦特性,将不等分剪切区理论与Oxley的滑移线模型相结合,提出负倒棱刀具直角切削热—力耦合模型。该模型主要包括主剪切区和倒棱变形区,基于Johnson-Cook材料本构模型建立了流动应力、剪切角、摩擦角和切削温度的控制方程,主切削力Fc和进给力F_f分别计算为主剪切区和倒棱变形区上沿切削速度方向和垂直于切削速度方向上分量之和。对比验证提出的预测模型实验和有限元仿真结果,发现其相对误差在15%以内,并分析了负倒棱参数对切削力的影响,该研究结果可以为负倒棱刀具结构参数优化和切削性能影响分析提供参考。
Based on the plastic flow state of the workpiece material and the friction characteristics of the tool-chip interface,the unequal shear zone theory is combined with Oxley′s slip line model,and the thermo-mechanical coupling model of orthogonal cutting with negative rake chamfering tool is proposed.The model mainly includes the primary shear zone and the chamfering deformation zone.Using the Johnson-Cook material constitutive model,the governing equations of flow stress,shear angle,friction angle and cutting temperature are established.The cutting force F c and the feed force F f are calculated respectively,by summing the components along the cutting speed direction and perpendicular to the cutting speed direction on the main shear zone and the chamfering deformation zone.The proposed prediction model is compared with the experimental and FE-simulation results and it is found that the relative error is within 15%.The influence of negative rake chamfering parameters on cutting force is analyzed.The research results provide reference for the structure parameters optimization and cutting performance the analysis for the chamfering tool.
作者
李炳林
贺世林
彭建财
涂小龙
余航
应显军
巫兴胜
Li Binglin;He Shilin;Peng Jiancai;Tu Xiaolong;Yu Hang;Ying Xianjun;Wu Xingsheng(School of Mechatronic Engineering,Southwest Petroleum University,Chengdu 610500,China;不详)
出处
《工具技术》
北大核心
2024年第6期91-96,共6页
Tool Engineering
基金
四川省自然科学基金(2022NSFSC1951)。
关键词
负倒棱刀具
直角切削
不等分剪切区
切削力预测
chamfering tool
orthogonal cutting
unequal shear zone theory
cutting force prediction
