Cutting Insert Geometry for Chip Discharge and Edge Durability
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Solution Overview
Problem
Existing cutting inserts with quadrangular plate shapes and peripheral end surfaces face challenges in ensuring durability of cutting edges and effective chip discharge, as they often lack sufficient space for chip passage, leading to reduced performance in cutting processes.
Innovation Solution
A cutting insert with a polygonal base featuring inclined surfaces and rake regions, allowing for enhanced chip discharge and improved durability through optimized cutting edge geometry and rotational symmetry, which facilitates better chip clearance and reduces clogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the peripheral surface includes four identical end surfaces with rake surfaces, then the cutting insert can perform cutting operations, but it is difficult to ensure durability of cutting edges located on outer peripheral edges and difficult to ensure space for chip passage
Solution Approach 1:
The patent applies asymmetry by making the first side have a different configuration from the second side. The first side includes four portions with different inclination angles relative to the reference line, creating an asymmetric chip discharge path. This asymmetric design allows optimization of chip flow on the first side while maintaining cutting functionality, thereby ensuring both cutting edge durability and adequate chip passage space.
Solution Approach 2:
The patent applies local quality by giving different inclination angles to different portions of the first side. Specifically, the first portion has a first inclination angle, the second portion has a second inclination angle, the third portion has a third inclination angle, and the fourth portion has a fourth inclination angle. This localized variation in surface geometry optimizes chip discharge in different regions while maintaining overall structural integrity and cutting edge durability.
2Productivity
If the cutting edges are positioned on outer peripheral edges for effective cutting, then cutting performance is improved, but durability of these cutting edges becomes difficult to ensure
Solution Approach 1:
The patent applies dimensionality change by transitioning from a conventional quadrangular plate shape to a polygonal base with a more complex first side configuration. The first side includes four portions with different inclination angles, creating a multi-dimensional chip discharge path. This dimensional complexity allows cutting edges to be positioned for optimal cutting performance while the varied surface geometry provides additional support and chip flow management, thereby improving durability.
3Ease of manufacture
If the base has a quadrangular plate shape with peripheral end surfaces, then manufacturing is simplified, but chip discharge performance deteriorates due to insufficient space for chip passage
Solution Approach 1:
The patent applies segmentation by dividing the first side into four distinct portions, each with a different inclination angle. This segmentation of the first side creates multiple zones for chip discharge, allowing chips to flow more effectively through the varied geometry. While more complex than a simple quadrangular shape, this segmented design maintains manufacturability while significantly improving chip discharge performance.
Data Source
AI summary
A cutting insert may include a base including a first surface, a second surface and a lateral surface. The first surface may include a first corner, a second corner and a first side. The first side may include a first portion, a second portion, a third portion and a fourth portion in this order in a direction from the first corner to the second corner. An imaginary straight line being in contact with the first portion may be a reference line in a front view of the first surface. Inclination angles of the first portion, the second portion, the third portion and the fourth portion relative to the reference line may be respectively a first angle, a second angle, a third angle and a fourth angle. The third angle may be smaller than each of the second angle and the fourth angle.