Flat-Top Cutting Tool Rake Structure for Chip Control
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Solution Overview
Problem
Cutting tools with ultra-high pressure sintered diamond bodies face difficulties in creating chip breakers with projections higher than the flat top face, limiting effective chip control.
Innovation Solution
A cutting tool design featuring a flat top face with a cutting edge formed at the corner connecting two linear ridge lines, and a fan-shaped rake portion with alternating ridge and groove portions, inclined from the corner, providing excellent chip control without the need for projections higher than the top face.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the cutting edge is formed by polishing the upper surface of the ultra-high pressure sintered body, then the top face remains flat, but it becomes difficult to create a projection higher than the flat top face, limiting chip breaker formation
Solution Approach 1:
The invention transitions from vertical projection (creating height above the flat top face) to horizontal patterning (creating fan-shaped ridge and groove portions on the top face). The chip breaker function is achieved through the alternating ridge and groove pattern that curls chips horizontally, rather than through vertical projection. This dimensional shift resolves the contradiction by maintaining the flat top face while enabling effective chip control through surface topology.
2Ease of operation
If projections higher than the flat top face are created for chip control, then chip breaker function is improved, but the flat top face configuration is compromised
Solution Approach 1:
The invention applies local quality by creating alternating ridge and groove portions with different surface topographies in specific fan-shaped regions of the top face. These localized structural variations (ridges for chip confinement, grooves for chip curling) provide chip breaker functionality without affecting the overall flat top face configuration. The local structural differentiation enables chip control while preserving the global flat surface geometry.
Data Source
AI summary
The present invention provides a cutting tool which has a flat top face but still has excellent chip control. The cutting tool includes: a peripheral side face; a top face which is a flat top face constituting a part of an upper surface that is depressed except for the portion of the top face; a cutting edge that is formed at least on a ridge line of a corner R connecting two linear ridge lines, out of ridge lines where the peripheral side face and top face cross; and a fan-shaped rake portion including ridge portions and groove portions, which are disposed alternately and are both depressed so as to be inclined from the corner R, where the crossing line with the top face appears in a wave form, toward a pivot portion which is a center of radial portions.