Dual-Edge Cutting Insert Geometry for Deep Small-Bore Machining
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Solution Overview
Problem
Cutting inserts with two cutting parts face limitations in entering workpieces deeply due to interference issues, particularly when machining small-diameter grooves or holes, as the unused cutting part or tool body can contact the workpiece wall, restricting machining capability.
Innovation Solution
A cutting insert design with two cutting parts oriented in opposite directions, featuring a unique geometry where the front cutting edges are positioned to increase the distance between them, allowing deeper insertion and supporting machining of small-diameter features by positioning the unused cutting part's edge closer to the tool body, reducing interference and enhancing machining precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a cutting insert with two cutting parts is used, then the productivity is improved by being able to use both cutting parts, but the device complexity increases due to the need to accommodate and position both cutting parts
Solution Approach 1:
The cutting insert body is divided into two distinct cutting parts, each with its own cutting edge. This segmentation allows the insert to function as two separate cutting tools, doubling the productivity by enabling sequential use of both cutting parts without changing the insert
Solution Approach 2:
The single cutting insert is designed to perform multiple cutting operations through its two cutting parts. The insert can be used for different cutting tasks or repeated uses, making one component serve multiple functions and reducing the need for multiple separate cutting inserts
2Length of moving object
If the cutting insert enters the workpiece deeply, then the machining capability for small-diameter grooves or holes is improved, but the unused cutting part or tool body interferes with the workpiece wall
Solution Approach 1:
The two cutting parts are positioned asymmetrically on the cutting insert body, with each cutting part located at different positions and orientations. This asymmetric arrangement allows the insert to enter the workpiece deeply while the unused cutting part is positioned away from the workpiece wall, eliminating interference
Solution Approach 2:
The cutting parts are arranged in three-dimensional space on the insert body, utilizing different spatial dimensions and angles. This dimensional arrangement allows deep insertion into small-diameter workpieces while positioning the unused cutting part in a different spatial plane that does not interfere with the workpiece wall
Data Source
AI summary
Provided is a cutting insert having two cutting parts that is capable of entering a workpiece more deeply and easily supports machining of a groove or hole having a small diameter in a workpiece. A cutting insert includes: a body having at least an inner surface to be fixed to a tool body of a cutting tool and an outer surface opposed to the inner surface; and two cutting parts protruding in opposite directions in a longitudinal direction of the body. The cutting part includes: a cutting upper surface; a cutting front surface; and a first cutting side surface and a second cutting side surface. A front cutting edge is located on an edge between the cutting upper surface and the cutting front surface. In a projection view of the body as seen from the longitudinal direction, the cutting upper surfaces of the two cutting parts are oriented in directions opposed to each other, and front cutting edges of the two cutting parts are disposed so as to be more away from each other as being closer to the first cutting side surface from the second cutting side surface.