Cutting Insert Wall Geometry for Chip Breaking at Larger Depths
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional cutting tools face difficulties in adequately controlling chips, particularly when the depth of cut is increased, leading to improper chip breaking.
Innovation Solution
The cutting tool features a cutting edge member with a concave first wall surface, convex second and third wall surfaces, and a fourth wall surface with a smaller height, arranged to effectively manage chip flow and breaking, including an arc or elliptical shape when cut with a perpendicular plane, enhancing chip control across varying cutting conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional chip breaker with a simple convex surface is used, then the structure is simple, but chip control deteriorates when depth of cut is increased
Solution Approach 1:
The chip breaker wall surface is divided into multiple functional zones: a first zone with a convex surface for initial chip engagement, a second zone with a concave surface for chip bending and breaking, and a third zone with another convex surface for chip control. This segmentation allows each zone to perform a specific function in the chip breaking process, ensuring reliable chip control even at increased depths of cut while maintaining reasonable structural complexity
Solution Approach 2:
Different portions of the chip breaker wall surface are given different geometric properties: the first zone has a convex surface with specific curvature for initial chip engagement, the second zone has a concave surface with specific depth and curvature for chip breaking, and the third zone has a convex surface for final chip control. This local differentiation of surface properties optimizes chip breaking performance across various cutting conditions without requiring complete structural redesign
2Productivity
If the depth of cut is increased to improve productivity, then material removal rate increases, but chip control deteriorates
Solution Approach 1:
The chip breaker design extends the control mechanism into the depth dimension by creating a concave surface that protrudes toward the cutting edge from the wall surface. This three-dimensional geometry provides additional chip control capability in the depth of cut direction, allowing effective chip breaking at larger depths of cut while maintaining productivity
Data Source
AI summary
There is provided a cutting tool in which chip control is improved. A cutting edge member includes a first wall surface which includes a concave surface which is formed to be depressed in a direction away from an intersection point of an imaginary plane and a corner portion and toward the center of a cutting insert in an end view when viewed from a direction facing an end surface, a second wall surface which includes a convex surface which is provided to be connected to the first wall surface at a position spaced apart from the imaginary plane and is protruded in a direction away from the center of the cutting insert in the end view, a third wall surface which includes a convex surface which is provided to be connected to the first wall surface at a position spaced apart from the imaginary plane on an opposite side to the second wall surface across the imaginary plane and is protruded in a direction away from the center of the cutting insert in the end view, and a fourth wall surface which is provided in an area between the first wall surface and the intersection point in the end view, includes a convex surface which is protruded in a direction away from the center of the cutting insert in the end view, and has a height smaller than heights of the second wall surface and the third wall surface in a side view when viewed from a direction facing a side surface.