Cutting Insert Chip-Splitting Geometry for Reliable Chip Evacuation
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Solution Overview
Problem
Existing machining tools face challenges in producing small, manageable chips that are easily evacuated during metal cutting operations, leading to issues such as chip jamming, increased stress and heat concentration, asymmetrical cutting forces, and premature tool failure due to vertices and gaps in conventional chip breakers.
Innovation Solution
The introduction of chip cutting edges in the cutting lips adjacent to the main cutting edge, forming a wedge-shaped protrusion that splits chips into narrower, more manageable pieces, with symmetrical cutting edge segments to evenly distribute load and reduce stress concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If conventional chip breakers with notches are used, then chip width is reduced, but stress concentration and heat generation increase at vertices
Solution Approach 1:
The cutting edge is divided into multiple segments separated by gaps, with each segment having its own chip breaker. This segmentation distributes the cutting load across multiple points rather than concentrating stress at single vertices, while still achieving effective chip width control through the coordinated action of multiple chip breakers
Solution Approach 2:
The gap between cutting edge segments acts as an intermediary element that allows chip material to pass through, reducing the need for extreme notch geometries that would create stress concentrations. The gap serves as a mediator that achieves chip control without the harmful stress concentration effect
2Shape
If asymmetrical chip breakers are used, then chip formation is controlled, but cutting forces become unbalanced
Solution Approach 1:
Each individual cutting edge segment employs asymmetrical chip breaker geometry optimized for its specific position and cutting direction. The asymmetry is localized to each segment rather than the entire cutting edge, allowing each segment to control chip formation effectively while maintaining overall force balance through the symmetrical arrangement of multiple segments
Solution Approach 2:
The cutting edge is segmented into multiple independent units, each capable of asymmetrical chip breaking. This segmentation allows localized asymmetry for optimal chip control at each position while the collective symmetrical arrangement of segments maintains balanced cutting forces
3Shape
If multiple chip breakers are used to control chip size, then chip evacuation is improved, but device complexity increases
Solution Approach 1:
The complex chip control function is achieved by segmenting the cutting edge into multiple simpler units. Each segment contains basic chip breaker geometry, but the collective arrangement of segments provides sophisticated chip size and shape control without requiring each individual element to be complex
4Ease of manufacture
If conventional cutting edges are used, then manufacturing is simple, but chip evacuation is poor
Solution Approach 1:
The cutting edge is segmented into multiple discrete units with gaps between them, creating a structure that is slightly more complex to manufacture than conventional continuous edges. However, this segmentation dramatically improves chip evacuation by allowing chips to pass through the gaps, and the modular nature of segments actually simplifies certain aspects of manufacturing and replacement
Data Source
AI summary
There is provided a machining assembly and cutting insert for machining metal or like workpieces, wherein the cutting insert body has a cutting end. The cutting end comprises at least one cutting edge and at least one cutting lip formed adjacent the at least one cutting edge. The at least one cutting lip includes at least one cutting protrusion and associated chip cutting edge to split the chip formed by the at least one cutting edge, for producing chips during machining which are of a width that is sufficiently reduced to allow proper evacuation or removal.