满足芯厚和前角条件的麻花钻螺旋槽几何模型和分析
2018-11-12
作者：李铸宇，王洪阳，刘贺轩，胡建忠
单位：大连工业大学
摘要：非标钻头的制造近年涌现出多种槽型。作为传统啮合开槽的替代方法，用1V1/1A1标准砂轮开槽逐渐得到推广，此时必须满足芯厚和前角的条件，精确搜索出数控加工时砂轮的安装位置。本文提出一种直接确定砂轮位置的新方法，基于相对运动原理实现参数化，利用微分几何的等距曲线推导满足芯厚的方程，用一维搜索满足前角条件，计算过程简单易操作。比较相同芯厚和前角槽型的比较，揭示了磨削参数和砂轮几何形状对生成槽型的影响规律。实际加工的槽型横截面数据和计算结果一致，证明方法有效，可进一步建立实用的刀具槽型图谱。
关键词：麻花钻；螺旋槽；等距曲线；芯厚；前角
中图分类号：TG713.1；TH162文献标志码：A
Modeling and Analysis of Twist Drill Fluting Fulfilling Required Web
Thickness and Rake Angle
Li Zhuyu，Wang Hongyang，Liu Hexuan，Hu Jianzhong
Abstract:Different kinds of flute configuration and modeling are developed for drills and other non-traditional cutting tools in last decades.As substitute of the meshing theory based fluting method，a kind of flute prevails is ground by using 1V1/1A1 standard wheel，and it should fulfill required web thickness and radial rake angle and to search an accurate wheel position for CNC grinding.This paper presents a novel method by straight forwardly determining install position of the grinding wheel.Based on the relative movement with variables′ parameterization，equations to keep web thickness are firstly derived.Then，a family of flute crosssectional curves is computed automatically with respect to grinding process parameters and wheel geometry.The calculation process is characterized by concise in principle and easy to use.Its validity is verified by good agreement between the results computed and manufactured example.The proposed method is flexible and adaptable to different wheels and could play as a role of grinding parameters atlas for drill design.
Keywords:twist drill；flute；equidistant curve；web thickness；rake angle