Cutting Tool Holder Curved Step for Stable Tool Post Positioning
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Solution Overview
Problem
Existing cutting tool holders face challenges in maintaining accurate positioning and durability under cutting loads due to machining errors and point contact with tool posts, leading to reduced machining accuracy and potential movement during cutting operations.
Innovation Solution
A cutting tool holder with a square column shape featuring a pocket for the cutting insert and a convex curve-shaped step on its second side surface, which allows for stable surface contact with the tool post, absorbing cutting loads and maintaining positioning accuracy even with machining errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a plate-like positioning member is attached to the tool body, then attachment accuracy to the tool post is improved, but the positioning member may move during cutting operations due to point contact
Solution Approach 1:
The positioning member features a curved surface (convex curve shape) instead of a flat surface, allowing it to make surface contact with the tool post rather than point contact. This curved interface distributes cutting loads across a larger area, preventing movement and maintaining reliable positioning during cutting operations while preserving attachment accuracy.
2Manufacturing precision
If a positioning pin is abutted against the tool post, then positioning is achieved, but the pin experiences high stress and reduced durability under cutting loads
Solution Approach 1:
The curved surface of the positioning member distributes cutting loads across a larger contact area with the tool post, reducing stress concentration that would occur with point contact. This improves durability and resistance to deformation under repeated cutting loads while maintaining positioning accuracy.
Solution Approach 2:
The invention changes the geometric parameters of the positioning interface from a point contact (pin) to a surface contact (curved surface). This parameter change increases the contact area, distributing loads and improving both durability and resistance to cutting forces while maintaining positioning functionality.
3Ease of manufacture
If a flat positioning surface is used, then manufacturing is simple, but machining errors cause positioning inaccuracy and holder movement
Solution Approach 1:
The curved surface design is relatively simple to manufacture using standard machining operations. The curvature provides self-aligning properties that compensate for minor machining errors, ensuring consistent positioning accuracy without requiring extremely tight tolerances. This maintains ease of manufacture while improving positioning reliability.
Data Source
AI summary
A holder has a square column shape extending from a first end toward a second end. The holder includes a pocket located on a side of the first end, and a first side surface and a second side surface each extending from the first end toward the second end. The second side surface includes a first region that is flat and that is located on the side of the first end, a second region that is flat and that is located closer to the second end than the first region and closer to the first side surface than the first region, and a step connecting the first region and the second region. The step has a convex curve shape toward the second end in a cross section parallel to the first region.