Four-Edge Cutting Insert Layout for Small-Bore Machining
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Solution Overview
Problem
Existing cutting inserts with four cutting edges are too thick for machining small bores and are difficult to use effectively.
Innovation Solution
A cutting insert with a parallelogram-shaped first surface and trapezoidal second surfaces, featuring four cutting edges that can be switched by changing the insert's position and orientation, along with a body design that includes first and second mounting seats for each edge configuration, allowing for efficient use of all edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the cutting insert is configured to allow four cutting edges by mounting upside down, then the number of usable cutting edges increases, but the thickness of the cutting insert becomes too large for machining small bores
Solution Approach 1:
The cutting insert utilizes its lateral surfaces (second surfaces) to form cutting edges instead of relying solely on end surfaces. By forming first and second cutting edges along different sides of the trapezoidal second surfaces, the design activates unused dimensional space, allowing four cutting edges to be formed on a thinner insert body without requiring increased thickness for additional edges
2Productivity
If the cutting insert has a thick design to accommodate four cutting edges, then all edges can be used, but it becomes difficult to use for machining small bores
Solution Approach 1:
The cutting insert is divided into distinct functional surfaces: first surfaces (end surfaces) and second surfaces (lateral surfaces). The cutting edges are segmented and distributed across these different surfaces, with first cutting edges along sides adjoining the first surface and second cutting edges along other sides of the second surfaces. This segmentation allows efficient space utilization and enables four cutting edges on a compact, thin profile suitable for small bore machining
Data Source
AI summary
A cutting insert is mounted to a body of a cutting tool, the cutting insert including: a first surface having a substantially parallelogram shape and provided as one of a pair of end surfaces that face each other; second surfaces provided as a pair of side surfaces that face each other, each second surface having a substantially trapezoidal shape and serving as a surface including a first rake surface and a second rake surface; a first cutting edge formed along a side of each of the second surfaces, the side being an adjoining side that adjoins the first surface from among sides that define the second surface; and a second cutting edge formed along a side of each of the second surfaces, other than the adjoining side that adjoins the first surface.