Asymmetric Cutting-Off Tool Chip Evacuation
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Solution Overview
Problem
Cutting-off processing tools with angled cutting edges effectively reduce projection remnants on workpieces but often damage the processed surface due to chips being evacuated perpendicular to the cutting edge, leading to surface damage.
Innovation Solution
A cutting-off processing tool with an upper surface laterally asymmetric in the width direction, featuring distinct rake angles and breaker projections on both corners, directing chip evacuation along the tool axis by creating differential chip evacuation speeds and utilizing a breaker projection on the rear side to stabilize and curl chips.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the cutting edge is angled at an end cutting edge angle to reduce projection remnants, then the projection remaining problem is solved, but chips are evacuated toward the processed surface causing surface damage
Solution Approach 1:
The upper surface is designed with lateral asymmetry about the center in the width direction, with different rake angles (θb > θc) and different breaker projection widths (FL1 < FL2) on the first corner side versus the second corner side. This asymmetric configuration creates differential chip evacuation speeds that redirect chips along the tool axis direction rather than toward the processed surface, while maintaining the end cutting edge angle for projection removal
Solution Approach 2:
Different regions of the upper surface are given different properties: the first corner side has a larger rake angle θb and smaller breaker width FL1 to accelerate chip evacuation on that side, while the second corner side has a smaller rake angle θc and larger breaker width FL2 to slow chip evacuation. This local differentiation of surface properties creates the net effect of redirecting chips away from the processed surface
Data Source
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AI summary
An object of the present invention is to configure a cutting-off processing tool that includes a cutting edge angled at an end cutting edge angle and causes evacuation of chips to be controlled so that the chips are evacuated in the tool axis direction, thereby reducing concerns about damage to a processed surface by the chips. The cutting-off processing tool includes a cutting edge 2 angled at the end cutting edge angle. In the cutting-off processing tool, an upper surface 3 has a shape laterally asymmetric about a center in a width direction. In the cutting-off processing tool, when θb is a rake angle of a rake face on a first corner side positioned on a foremost end of the tool, and θc is a rake angle of the rake face on a second corner side, θb > θc is satisfied.