Kevlar复合材料麻花钻制孔最大切削力研究
2020-11-18
作者：巩文东1，2，林毓梁1，连超3
单位：1山东职业学院；2天津工业大学机械工程学院；3中国科学院海洋研究所
摘要：为预测Kevlar复合材料麻花钻制孔中的最大切削力，根据Kevlar复合材料及麻花钻的结构特点，分析刀具主切削刃和横刃产生的切削力。主切削刃切削过程分解为对复合材料试件单层的二维切削作用，划分为3个变形区并建立各变形区的力学模型。将横刃切削作用等效为楔形挤压模型，设计有预制孔和无预制孔两组试验，分别对主切削刃和横刃力学模型进行验证。结果表明：主切削刃与横刃产生的最大切削力实测值与理论值变化趋势一致，其中轴向力的实测值比理论值偏大，切向力的实测值在理论值上下波动。
关键词：Kevlar复合材料；钻孔；切削力；变形区
中图分类号：TG713；TH161.3文献标志码：ADOI：10.3969/j.issn.1000-7008.2020.11.008
Research on Maximum Cutting Force During Drilling KFRP Composites
Gong Wendong，Lin Yuliang，Lian Chao
Abstract:In order to predict the maximum cutting force during drilling KFRP composites，based on the structure of the Kevlar fiber reinforced plastic composite and the twist drill，the force at the main cutting edge and the chisel edge are analyzed.The cutting process of the main cutting edge is decomposed into orthogonal cutting for a single layer of the composites，and the cutting process is divided into three deformation zones to establish mechanical models.The cutting process of the chisel edge is taken as the wedge extrusion model.And two groups of experiments are designed to verify the models of the main cutting edge and the chisel.The experimental results indicate that the predicted maximum cutting force has the same change laws with those of the experiments while the measured axial force is bigger than the predicted value，and the measured tangential force is fluctuated up and down the predicted value.
Keywords:KFRP composites；hole drilling；cutting force；deformation zone