Rotary Tool Ridge Geometry for Stable Chip Flow and Edge Strength
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Solution Overview
Problem
Cutting inserts and rotary tools face challenges in stabilizing chip flow and ensuring the strength of the cutting edge to improve durability and chip dischargeability.
Innovation Solution
A cutting insert design featuring a body with a first flank face, a first flute, and a first ridge line with a recessed portion, a first inner edge, and a first outer edge, where the flute includes a recessed groove connected to the recessed portion and outer edge, but separated from the inner edge, stabilizing chip flow and enhancing cutting edge strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a chip breaker groove is formed along the cutting edge to improve chip dischargeability, then chip flow is stabilized, but the strength of the cutting edge is reduced
Solution Approach 1:
The ridge line is segmented into multiple portions (first ridge line portion, second ridge line portion, third ridge line portion) with different configurations. The first ridge line portion has a first recessed portion for chip control, while the second and third portions maintain stronger configurations, allowing different sections to serve different functions - chip management versus structural strength
Solution Approach 2:
Different portions of the cutting edge are given different local characteristics. The first ridge line portion near the tip has a recessed groove configuration for improved chip discharge, while the second and third ridge line portions have different configurations that maintain cutting edge strength, creating local quality variations along the cutting edge
2Duration of action of stationary object
If the cutting edge is strengthened to improve durability, then durability is improved, but chip flow stability is reduced
Solution Approach 1:
The cutting edge is divided into multiple ridge line portions with different configurations. The first ridge line portion is optimized for chip flow with a recessed portion, while the second and third portions are configured to provide structural strength and durability, allowing both chip flow stability and durability to be achieved through segmentation
Solution Approach 2:
Different local regions of the cutting edge have different geometries optimized for different functions. The tip region (first ridge line portion) has characteristics for stable chip flow, while the rear regions (second and third ridge line portions) have characteristics for strength and durability, resolving the contradiction through local quality differentiation
Data Source
AI summary
A rotary tool according to an aspect includes a body, a flank face positioned at a side of a tip end of the body, a flute extending from the flank face toward a rear end of the body, and a ridge line positioned at an intersection of the flank face and the flute. The ridge line includes a recessed portion recessed toward the rear end of the body, an inner edge extending from the recessed portion toward the tip end of the body, and an outer edge extending from the recessed portion toward an outer periphery of the body. The flute includes a recessed groove extending along the outer edge. The recessed groove is connected to the recessed portion and the outer edge, and is separated from the inner edge.