Cutting Tool Insert Seat Curvature for Crack Relief and Stable Seating
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Solution Overview
Problem
Conventional cutting tools lack a specific guideline for the preferred shape and dimensions of the curve portion at the insert seat to prevent stress concentration and ensure stable seating of the cutting insert.
Innovation Solution
A cutting tool with an insert seat featuring a recessed curve portion having a radius of curvature between 0.5 mm to 1.2 mm and a height from 0.1 mm to 0.8 mm, which alleviates stress concentration and enhances the seating stability of the cutting insert by allowing it to be firmly fixed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a curve portion is formed at the crossing portion between the bottom surface and wall surface of the insert seat to alleviate stress concentration, then the risk of cracking is reduced, but the seating stability of the cutting insert deteriorates due to increased distance between abutment surfaces
Solution Approach 1:
The patent optimizes specific parameters of the curve portion: radius of curvature R set to 0.5-1.2mm and height H set to 0.1-0.8mm. These parameter ranges balance stress alleviation with maintaining adequate abutment surface area, resolving the contradiction between crack prevention and seating stability
Solution Approach 2:
The curve portion is strategically positioned and dimensioned to provide stress relief only where needed at the crossing portion, while maintaining flat, stable abutment surfaces elsewhere. This localized curvature approach prevents cracking without compromising overall seating stability
2Reliability
If the curve portion is made deeper to better alleviate stress at the crossing portion, then crack prevention is improved, but the abutment surface area is reduced leading to poorer seating stability
Solution Approach 1:
The patent defines precise parameter ranges for the curve portion depth (height H = 0.1-0.8mm) and curvature radius (R = 0.5-1.2mm). These optimized parameters ensure sufficient stress relief while preserving adequate abutment surface area for stable insert seating
Solution Approach 2:
The curve portion extends partially along the crossing portion rather than throughout the entire insert seat, providing stress relief where most needed while conserving abutment surface area in regions where stability is critical
Data Source
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AI summary
In a body (1) for a cutting tool (100) having an insert seat (3), to which a cutting insert (2) is removably attached, not only a structure for preventing a crack at the insert seat, caused by stress concentration, is adopted, but also the cutting insert (2) is stably seated at and firmly attached to the insert seat (3). A recessed curve portion (7) is formed at a crossing portion between a bottom surface (4) and a wall surface (5) of the insert seat (3). As viewed in cross section perpendicular to the bottom surface (4), the cross-sectional shape of the curve portion (7) includes an arc having a radius R of curvature within a range from 0.5-1.2 mm. A height (H) from the bottom surface (4) to a connecting portion between the wall surface (5) and the curve portion (7) is set within a range from 0.1-0.8 mm.