Study on chip breaker. Chip breaking mechanism of a chip breaker applicable to wide range of feed rate and depth of cut.

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Other Title
  • チップブレーカに関する研究　　広域型チップブレーカの切りくず折断機構
  • チップブレーカ ニ カンスル ケンキュウ コウイキガタ チップブレーカ ノ キ
  • Chip Breaking Mechanism of a Chip Breaker Applicable to Wide Range of Feed Rate and Depth of Cut
  • 広域型チップブレー力の切りくず折断機構

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Abstract

A circular cylinder of SS41 was turned with a new chip breaker, which breaks the long chip under the cutting conditions of cutting speed of 3.0 m/s, depth of cut from 0.1 mm to 3.0 mm and feed rate from 0.05 mm/rev to 0.51 mm/rev. The situations of the chip flow and the chip breaking were taken photos with a high speed camera, and they were analyzed. The mode of the chip breaking is divided into six types according to cutting condition. Each part of this chip breaker has an effect on these types of chip breaking. That is : This chip breaker forces the chip to flow in a certain path not only at up curling but also at side curling, that causes the chip to break. A step on the face perpendicular to the major cutting edge makes the second moment of area of the chip large at comparatively large depth of cut and low feed rate, that makes the strain in the bent chip large and causes the chip to break.

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