硬质合金麻花钻的剪切增稠抛光试验研究  

Experimental Study on Shear Thickening Polishing of Cemented Carbide Twist Drills

作　　者：黄向明[1] 曾清 李希扬 周辉 李鸿宇 王熔 何洪 HUANG Xiangming;ZENG Qing;LI Xiyang;ZHOU Hui;LI Hongyu;WANG Rong;HE Hong(College of Mechanical and Vehicle Engineering,Hunan University,Changsha 410082,China;China Aviation Power Parts Manufacturing Co.,Ltd.,Zhuzhou 412007,China)

机构地区：[1]湖南大学机械与运载工程学院,湖南长沙410082 [2]中航动力株洲航空零部件制造有限公司,湖南株洲412007

出　　处：《湖南大学学报（自然科学版）》2023年第6期1-8,共8页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(51975203)。

摘　　要：针对硬质合金钻削刀具曲面加工效率低的问题,提出了用剪切增稠抛光(Shear Thickening Polishing,STP)方法实现硬质合金钻削刀具的复杂双螺旋曲面的低成本、高效率整体高质量抛光加工.配制具备剪切增稠特性的非牛顿抛光流体,使用MCR302旋转流变仪测试其流变特性.基于剪切增稠抛光液的流变特性,对硬质合金麻花钻的刃背、刃带和螺旋槽曲面进行整体抛光.采用控制变量法分析抛光槽转速和工件转速对硬质合金麻花钻表面粗糙度与材料去除率的影响规律.试验结果表明,加工后的麻花钻整体表面粗糙度随抛光槽转速的增大先减小再增大,在抛光槽转速为90 r/min时,加工效果最好.随着工件转速的增加,其整体表面粗糙度先减小后基本不变或略有增加,在工件转速为3500 r/min时,加工效果最好.麻花钻材料去除率与抛光槽转速及工件转速呈正相关.在较优加工参数抛光槽转速90 r/min、工件转速3500 r/min下,麻花钻经STP 60 min后,其刃背、刃带和螺旋槽表面粗糙度分别从原始的310 nm、450 nm、270 nm降低至10 nm、243 nm、15 nm,刃背和螺旋槽磨削痕迹几乎消失,螺旋槽刃口处缺陷明显减少.In this paper,the Shear Thickening Polishing(STP)method is proposed to realize the low-cost,high-efficiency overall high-quality polishing of the complex double helix surface of the carbide drilling tool,aiming at the problem of low efficiency of surface processing of cemented carbide drilling tools.First,non-Newtonian polishing fluid with shear-thickening properties was prepared.Then their rheological properties were tested using an MCR302 rotational rheometer.Based on the rheological properties of the shear thickening polishing slurry,the body clearance,the margin,and the helical surface of the flutes of the cemented carbide twist drill were polished.Using the control variable method,the influence of the rotational speed of the polishing groove and the rotational speed of the workpiece on the surface quality and material removal rate of the cemented carbide twist drill was analyzed.The experimental results show that the overall surface roughness Ra of the processed twist drill first decreases and then increases with the increase of the rotational speed of the polishing groove,and the effect of processing is the best when the rotational speed of the polishing groove is 90 r/min.The overall Ra of the twist drill first decreases and then remaines basically unchanged or slightly increases with the increases of the rotational speed of the workpiece,and the effect of processing is the best when the rotational speed of workpiece is 3500 r/min.The material removal rate of the twist drill is positively correlated with the rotational speed of the polishing groove,and the rotational speed of the workpiece.Under the optimal processing parameters of the rotational speed of the polishing groove of 90 r/min and the rotational speed of the workpiece of 3500 r/min,the twist drill was processed using STP technology for 60 min,the Ra of the body clearance,the margin and the helical surface of the flutes change from the original 310 nm,450 nm and 270 nm to 10 nm,243 nm and 15 nm,respectively,the grinding marks of the body clearanc

关 键 词：剪切增稠抛光 麻花钻 硬质合金 螺旋曲面 表面粗糙度 

分 类 号：TG580[金属学及工艺—金属切削加工及机床]