Rotatable Cutting Insert Constraint for Stable Cutout Angles
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Solution Overview
Problem
Conventional indexable tools face issues where the cutout angle of the cutting edge changes when force is applied perpendicularly to the insert during the cutting process, leading to unintended changes in the inclination angle of the cutting edge relative to the axial center of the body.
Innovation Solution
The insert is constrained by a pair of side wall surfaces within a fitting recess and assembled with the body using a shaft-like fastening member, featuring a constraining part with first and second constraining surfaces that maintain the cutout angle without requiring body replacement, ensuring the cutting edge remains stable during rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the insert is fixed to the body using a fixture that allows rotational movement for angle adjustment, then the cutout angle can be varied without replacing the body, but the insert may rotatably move during the cutting process when force is applied perpendicularly to the plate thickness direction
Solution Approach 1:
The insert is divided into a constraining part and a blade part. The constraining part contains multiple constraining surfaces (first and second constraining surfaces) that can selectively contact the side wall surfaces of the fitting recess. This segmentation allows different constraining surfaces to be engaged for different cutout angles while maintaining stable positioning during cutting.
Solution Approach 2:
The insert design incorporates multiple constraining surfaces with different orientations and positions relative to the central axis. By changing which constraining surface contacts the side wall surfaces, the inclination angle of the cutting edge can be adjusted. The parameters of the constraining surfaces (angles, positions) are specifically designed to provide both angle variability and cutting stability.
2Adaptability or versatility
If multiple constraining surfaces are provided on the constraining part to vary the cutout angle, then the insert structure becomes more complex, but the load distribution between contact surfaces needs to be balanced
Solution Approach 1:
The first and second constraining surfaces are designed with asymmetric configurations relative to the central axis of the through hole. The shortest distances from the central axis to these surfaces are equal, but their orientations differ. This asymmetric design enables multiple stable contact positions while maintaining balanced load distribution, avoiding excessive structural complexity.
Data Source
AI summary
An insert is provided, ensuring to vary the cutout angle of the cutting edge without replacing the body, and to prevent the change in the cutout angle of the cutting edge in the cutting process. The insert includes a constraining part, a through hole, and a blade. The blade includes a cutting edge for the cutting process. An outer surface of the constraining part around the central axis includes a pair of first constraining surfaces, and a pair of second constraining surfaces. The cutting edge in the state where the pair of first constraining surfaces are fixed becomes non-parallel to the cutting edge in the state where the constraining part is rotated around the central axis from the fixed state of the pair of first constraining surfaces to place the pair of second constraining surfaces on the same surface on which the pair of first constraining surfaces have been fixed.