Dynamic Cutting Force in High-Spindle-Speed Miling Using Small Ball End mill.

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  • 小径ボールエンドミルを用いた高回転ミーリングにおける動的切削力
  • ショウケイ ボールエンドミル オ モチイタ コウカイテン ミーリング ニ オケル ドウテキ セッサクリョク

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Abstract

Cutting force as well as cutting energy is essential to be reduced in the "one tool milling process" for complicated shaped dies and molds made of hardened steel using only a small ball end mill, in stead of the conventional sequential milling process from rough endmilling to fine one using various end mills. In the present paper, cutting force components and cutting energy are measured to analyze in high-spindlespeed, high-feed rate milling of hardened steel using ball end mills of lmm in radius. The following results were obtained: (1) Three components of dynamic cutting force can be measured individually on a unidirectional sensing load cell at a spindle speed up to 4.5×104min-1. (2) The maximum value of each component of dynamic cutting force significantly decreases with increase of either spindle speed or feed rate. (3) Effective value of axial cutting force component increases along with feed rate. (4) Specific energy evaluated from spindle power consumption is good correspondent to that from monitored cutting force. These results are significantly favorable characteristics in realizing more high productivity on the high-spindle-speed milling using only a small ball end mill.

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