Double-Sided Negative Cutting Insert for Seat-Safe Eight-Edge Milling
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Solution Overview
Problem
Existing double-sided negative cutting inserts with right-hand cutting edges require careful orientation to avoid tool failure when used in left-hand insert seats, and the negative axial tipping-in angle increases cutting difficulty.
Innovation Solution
A double-sided negative cutting insert designed with eight working positions, featuring main and minor cutting edges that are inclined to counteract the negative axial tipping-in angle, ensuring right-hand and left-hand edges are correctly positioned in their respective seats, preventing tool failure and enhancing cutting efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a double-sided negative cutting insert with right-hand cutting edges is used, then the cutting insert can be mounted in a right-hand insert seat, but it cannot be correctly mounted in a left-hand insert seat without causing tool failure
Solution Approach 1:
The cutting insert incorporates both right-hand and left-hand cutting edges with asymmetric geometries. The right-hand cutting edges have a positive rake angle configuration suitable for right-hand insert seats, while the left-hand cutting edges have a mirrored asymmetric configuration suitable for left-hand insert seats. This asymmetric design allows the single insert to adapt to different insert seat types without causing tool failure.
Solution Approach 2:
The cutting insert is designed as a universal component that can be mounted in both right-hand and left-hand insert seats. By integrating multiple sets of cutting edges with different hand configurations on the same insert body, the insert achieves multi-functionality, eliminating the need for separate right-hand and left-hand inserts and ensuring reliable operation regardless of insert seat orientation.
2Shape
If a negative axial tipping-in angle is given to the cutting insert, then clearance is created behind the cutting edge, but the cutting process becomes heavier and more difficult
Solution Approach 1:
The patent applies parameter changes by modifying the rake angle and edge geometry parameters of the cutting edges. By optimizing the rake angle compensation and edge inclination parameters, the insert maintains the necessary clearance geometry from the negative axial tipping-in angle while reducing the adverse effects on cutting difficulty through precise parameter optimization.
Data Source
AI summary
A double-sided negative cutting insert for use in milling with eight working positions is provided. A peripheral surface extends around the cutting insert and has four main side faces including first and second main side faces arranged opposite each other on opposite sides of the insert and third and fourth main side faces arranged opposite each other on two other opposite sides of the insert. The cutting insert has eight sets of cutting edges, each including a main cutting edge, a corner cutting edge and a minor cutting edge. Two flat side surfaces that are inclined towards each other are provided on each one of the first and second main side faces. The main cutting edges are arranged along a respective one of the side surfaces on the first and second main side faces and all minor cutting edges are arranged along the third and fourth main side faces.