Cutting Insert Acute Side Angles High-Feed Stability
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Solution Overview
Problem
Conventional cutting inserts with obtuse angles between side and mounting surfaces fail to maintain stability during high-feed machining, leading to screw breakage and damage to the tool and workpiece, particularly in critical applications like aircraft parts.
Innovation Solution
A cutting insert with inclined side surfaces forming acute angles with both the top and bottom surfaces, featuring main and non-cutting edges, and a screw mounting configuration that prevents abnormal breakage by ensuring stable chip discharge and reduced cutting resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the side surface and mounting surface form an obtuse angle in a conventional cutting insert, then the structure is simple to manufacture, but the cutting force generated during high-feed machining breaks the screw and causes separation of the cutting insert
Solution Approach 1:
The patent changes the geometric parameter of the cutting insert by forming an acute angle between the side surface and mounting surface, rather than the conventional obtuse angle. This parameter change modifies the force distribution during cutting, preventing screw breakage while enabling high-feed machining. The acute angle configuration redirects cutting forces away from the screw mounting points, thereby maintaining both high productivity and reliability.
2Productivity
If the feed rate is increased to enhance productivity using conventional cutting inserts, then production efficiency improves, but the cutting force breaks the screw and damages the workpiece
Solution Approach 1:
The patent modifies the geometric parameter of the cutting insert by forming an acute angle between the side surface and mounting surface, rather than the conventional obtuse angle. This parameter change modifies the force distribution during cutting, preventing screw breakage and workpiece damage while enabling high-feed machining. The acute angle configuration redirects cutting forces away from critical components, thereby maintaining both high productivity and reliability.
3Reliability
If a cutting insert with acute angles is used, then screw breakage is prevented and machining stability is achieved, but the device complexity increases compared to conventional designs
Solution Approach 1:
The patent implements a geometric parameter change by forming acute angles between the side surface and mounting surface. While this creates a more complex geometry compared to conventional obtuse-angle designs, the complexity is justified by the significant improvement in cutting stability and prevention of screw breakage. The acute angle configuration is a straightforward geometric modification that can be integrated into existing manufacturing processes.
Data Source
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AI summary
An indexable cutting insert for vertical and oblique machining. The cutting insert has top and bottom surfaces, first to fourth side surfaces extending between the top and bottom surfaces, and a screw hole passing through the top and bottom surfaces. The top surface has a mounting surface of a flat surface. The top and bottom surfaces are rotationally symmetric with each other. A cutting edge is formed at a junction between the top surface and the adjacent first and second side surfaces. A non-cutting edge is formed at a junction between the top surface and the adjacent third and fourth side surfaces. The first and second side surfaces form an acute angle with a plane extending from the mounting surface of the top surface. The third and fourth side surfaces form an obtuse angle with the plane extending from the mounting surface of the top surface.