Three-Edge Lay-Down Cutting Insert for Small-Bore Keyway Machining
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Solution Overview
Problem
Existing indexable cutting inserts lack the capability to efficiently cut constant width keyways or channels in workpieces with small bore sizes and provide adequate support for non-rotating cutting tools during internal machining operations, especially in tight spaces.
Innovation Solution
An indexable lay-down cutting insert with a central body and three circumferentially spaced cutting portions, featuring a unique geometry with support surfaces, rake surfaces, and coolant grooves, allowing for precise cutting and improved support, and a cutting tool holder that securely positions the insert for optimal cutting performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional indexable cutting insert is used, then the insert can be retained in an insert receiving pocket, but it lacks the capability to efficiently cut constant width keyways or channels in workpieces with small bore sizes
Solution Approach 1:
The cutting insert is divided into three separate cutting portions arranged circumferentially around a central body, with each portion having its own cutting edge. This segmentation allows the insert to cut constant width keyways or channels by engaging the workpiece with multiple discrete cutting points, enabling efficient machining of small bore sizes while maintaining adaptability for various cutting operations
Solution Approach 2:
The cutting portions are positioned at different radial distances from the central body, with outer radial positions providing larger cutting distances. This dimensional arrangement allows the insert to accommodate workpieces with small bore sizes by adjusting which cutting portion is active, while still maintaining the capability to cut constant width keyways or channels through the geometric configuration of the cutting edges
2Ease of operation
If a non-rotating cutting tool is used for internal machining operations, then the tool can access tight spaces, but it lacks adequate support for the operative cutting portion
Solution Approach 1:
The insert holder includes a support surface configured to engage specifically with the operative cutting portion of the insert, providing localized support where needed. This local quality enhancement ensures adequate support for the cutting portion actively engaged in machining, while allowing the insert to access tight spaces through its compact design and multiple cutting portion configuration
3Manufacturing precision
If a cutting insert with three circumferentially spaced cutting portions is used, then constant width keyways or channels can be cut, but the insert requires precise positioning and support mechanisms
Solution Approach 1:
The insert holder is designed with a universal support surface that can accommodate and support any of the three cutting portions of the insert, depending on which portion is actively engaged in cutting. This multi-functional support structure enables precise positioning and adequate support for the operative cutting portion, ensuring constant width keyway or channel cutting accuracy while avoiding excessive device complexity through a unified, adaptable support mechanism
Data Source
AI summary
In a cutting tool having an indexable lay-down cutting insert with a central body portion and three circumferentially spaced apart cutting portions, the cutting insert is removably secured to an elongated holding portion of an insert holder. Each cutting portion has a cutting edge with first and second cutting end points, the cutting edge formed at the intersection of an upward facing rake surface and a radially outward facing relief surface. In a top view of the cutting insert, parallel imaginary first and second vertical planes containing the first and second cutting end points, intersect the central body portion at first and second body side points, which are located first and second cutting distances from the first and second cutting end points, respectively. Each of the first and second cutting distances is greater than twenty-five percent of the first radius of an imaginary first circle circumscribing the cutting insert.