整硬麻花钻刃型结构对加工钛合金切削性能的影响  

Influence of Edge Structure of Solid Carbide Twist Drill on Cutting Performance of Machining Titanium Alloy

作　　者：马文宇 何云[1] 李志慧 任博远 赵锦章 Ma Wenyu;He Yun;Li Zhihui;Ren Boyuan;Zhao Jinzhang(School of Mechanical and Power Engineering,East China University of Science and Technology,Shanghai 200237,China;Guohong Tool System(Wuxi)Co.,Ltd.,Wuxi Jiangsu 214199,China)

机构地区：[1]华东理工大学机械与动力工程学院,上海200237 [2]国宏工具系统(无锡)股份有限公司,江苏无锡214199

出　　处：《硬质合金》2021年第2期133-140,共8页Cemented Carbides

摘　　要：本文介绍了一种麻花钻主切削刃前角的测量方法,探究麻花钻钻尖前角刃型变化对切削力、切屑形貌、孔径精度和钻头寿命的影响。实验采用的五款不同前角分布和横刃结构的麻花钻在不同的切削参数下以内冷的方式对TC4钛合金钻削的盲孔,结果表明:横刃长度和主切削刃前角分布对切削力产生影响。横刃长度越长,切削力越大。等前角型切削刃切削力大于前角增长型切削刃。前角分布对切削力的影响大于横刃长度。前角增长型切削刃断屑性能好,切屑完整规则。横刃轴向前角接近0°,孔径偏差较小。前角值越大,刃口强度越弱。A method for measuring the rake angle of the main cutting edge of twist drill was introduced and the effect of the variation of the cutting edge shape of the rake angle of twist drill tip on the cutting force, chip shape, hole diameter accuracy and tools life was investigated in this paper. Five kinds of Φ6 mm twist drills with different rake angle distribution and cross blade structure were used to drill 25 mm blind holes in TC4 titanium alloy by internal cooling under different cutting parameters. The results of the experiments show that the cutting force is affected by the length of the chisel edge and the distribution of rake angle of the main cutting edge. The longer the chisel length, the greater the cutting force, and the cutting force of the equal-rake-angle cutting edge is greater than that of the increasing-rake-angle cutting edge. The effect of rake-angle distribution on cutting force is greater than that of chisel edge length. The cutting edge with increasing-rake-angle has good chip-breaking performance and the chip is complete and regular. The chisel edge axis rake angel is closer to 0°, and the deviation of hole diameter is small. The larger the rake angle, the weaker the edge strength.

关 键 词：整体硬质合金 麻花钻 前角 横刃 切削性能 

分 类 号：TG146.23[一般工业技术—材料科学与工程]