基于磨制精度的环形铣刀刃线几何模型

环形铣刀在精密铣削淬硬钢模具时，同球头铣刀相比具有较高的切削效率，和平头端铣刀相比具有较好的加工工艺性及已加工表面质量。为了精确磨制环形铣刀，通过对环形铣刀刃线进行理论分析,依据回转刀具的几何特征以及螺旋线的成形原理，推导出了环形铣刀等螺旋角的连续刃口曲线数学模型，所建立的刃线方程数学模型可精确表达周刃曲线与圆角曲线的几 何特征。结合所建立的刃线模型，采用Saacke五轴工具磨床对环形铣刀进行了磨制，刀具几 何参数检验结果表明磨制精度较高。

Cutting Edge Geometric Model of Ring Milling Tool Based on Grinding Precision

The ring milling tool has higher cutting efficiency than ball-end milling tool in finish-milling of hardened steel molds. Also , it has better processing technology and quality of machined surface compared with the flat end milling tool. In order to machine ring milling tool accurately, the theory of edge line of ring milling tool is analyzed. According to the geometrical characteristics of rotary cutting tool and the forming principle of spiral, a continuous cutter edge curve model with equal helix angle for ring milling cutter is derived. The blade edge equation mathematical model can reflect the geometric features of circumferential blade curve and fillet curve. Combined with the established model of cutting line, the ring milling tool is grinded by Saacke five-axis grinding machine. The test results for tool geometric parameters indicate that the tool has high grinding precision.