Cutting Insert Geometry for Four-Edge Switching in Boring
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Solution Overview
Problem
Cutting inserts for machining inner surfaces face challenges in efficiently switching and using multiple cutting edges without increasing the size of the insert, which affects machining stability and roundness.
Innovation Solution
A cutting insert design with overlapping cutting edges and margins, allowing for the use of four cutting edges while maintaining a compact size, achieved through specific geometric configurations and fastening methods, enabling efficient edge switching without requiring a separate reverse body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple cutting edges and margins are disposed separately in a cutting insert, then the number of switchable cutting edges increases, but the size of the cutting insert becomes large
Solution Approach 1:
The patent applies dimensional repositioning by moving the margin from its traditional position adjacent to the cutting edge to an overlapping position on the opposite side of the insert. Specifically, the first margin is disposed to overlap with the second cutting edge in a view perpendicular to the first end surface, and the second margin overlaps with the first cutting edge. This cross-positioning in a different spatial dimension allows four cutting edges to be utilized without increasing the insert's external dimensions.
Solution Approach 2:
The patent implements a nested arrangement where margins are positioned within the spatial envelope defined by the cutting edges. The first margin overlaps with the second cutting edge, and the second margin overlaps with the first cutting edge, creating a nested configuration where functional elements are interlaced rather than sequentially arranged. This nesting allows multiple cutting edges and margins to coexist in a compact configuration.
2Adaptability or versatility
If cutting edges are disposed to maximize utilization, then edge switching capability improves, but machining stability and roundness deteriorate due to insufficient margin contact
Solution Approach 1:
The patent applies local quality optimization by ensuring that each cutting edge has its corresponding margin positioned to provide adequate contact with the workpiece inner surface during machining. The first margin overlaps with the second cutting edge and the second margin overlaps with the first cutting edge, ensuring that regardless of which cutting edge is active, there is a corresponding margin in proper position to maintain roundness and stability. This localized optimization of margin-cutting edge relationships maintains machining quality while enabling edge switching.
3Adaptability or versatility
If a separate reverse body is used to access all four cutting edges, then complete edge utilization is achieved, but device complexity and cost increase
Solution Approach 1:
The patent implements universality by designing a single cutting insert body that can accommodate and utilize all four cutting edges through strategic positioning. The insert is designed with first and second cutting edges on the first end surface, and third and fourth cutting edges on the second end surface, with margins positioned to support all edges. This multi-functional design eliminates the need for separate reverse bodies or multiple inserts, allowing complete edge utilization within a single universal component.
Data Source
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AI summary
A cutting insert (30) that can switch and use a total of four cutting edges while still suppressing an increase in the size of the cutting insert, and a cutting tool equipped with the cutting insert are provided. The cutting insert includes: a pair of first cutting edges (311, 312) that are disposed along sides delimiting a first end surface (110); a pair of first margins (411, 412) that are disposed along the other sides; a pair of second cutting edges (321, 322) that are disposed along sides delimiting a second end surface (120); a pair of second margins (421, 422) that are disposed along the other sides; a pair of first side surfaces (211, 212) that extend from the first cutting edges to the second margins; and a pair of second side surfaces (221, 222) that extend from the second cutting edges to the first margins.