Indexable Cutting Insert Geometry for Stable High-Feed Rotary Cutting
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Solution Overview
Problem
There is a need for an improved rotary cutting tool with a disk-shaped cutting body having identical insert receiving pockets and identical indexable cutting inserts, which provides high stability and enables cutting operations at high feed rates.
Innovation Solution
The rotary cutting tool features a disk-shaped cutting body with a plurality of identical insert receiving pockets and an equal number of identical indexable cutting inserts. Each cutting insert has a specific geometry, including bearing surfaces, abutment surfaces, and cutting edges, which are designed to provide stability and effective cutting performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If identical cutting inserts are used in all insert receiving pockets, then manufacturing complexity is reduced and cost is lowered, but cutting performance may be insufficient for different machining conditions
Solution Approach 1:
The cutting tool is segmented into multiple identical insert receiving pockets, each capable of accepting cutting inserts with different geometries. This allows the tool body to be manufactured once with standardized pockets, while enabling versatility through interchangeable inserts.
Solution Approach 2:
The insert receiving pockets are designed with universal geometry to accommodate multiple types of cutting inserts. The pockets have standardized dimensions and features that work with different insert configurations, allowing one tool holder to perform multiple cutting functions.
2Device complexity
If cutting inserts are retained with simple retention mechanisms, then device complexity is reduced, but stability of the cutting inserts is insufficient
Solution Approach 1:
Multiple retention features are merged into a unified retention system within each insert receiving pocket. The pocket integrates lateral walls, bottom surfaces, and engagement features that work together to provide stable insert retention without requiring separate complex retention mechanisms.
Solution Approach 2:
The retention mechanism utilizes three-dimensional geometric interlocking between the insert and pocket. The insert geometry is designed to engage with the pocket walls and bottom in multiple dimensions, providing stability through spatial constraints rather than complex mechanical fasteners.
3Productivity
If high feed rates are used in cutting operations, then productivity is increased, but stability requirements of the cutting inserts increase
Solution Approach 1:
The cutting inserts are pre-positioned and secured in their receiving pockets before the cutting operation begins. The retention features are designed to establish stable engagement in advance, ensuring that high feed rates can be maintained throughout the cutting process without insert displacement.
Solution Approach 2:
The cutting inserts are designed as replaceable, cost-effective components that can be quickly changed when worn. This allows the use of aggressive cutting parameters including high feed rates, as worn inserts are simply replaced rather than re sharpened or repositioned, maintaining productivity without compromising stability.
Data Source
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Figure 5
AI summary
An indexable cutting insert comprising a peripheral surface. In a cross-section taken in a horizontal plane perpendicular to an insert axis and intersecting the peripheral surface: first and second peripheral corner points formed at the intersection of a first end surface and first and second side surfaces, respectively, define the end points of a first lateral side of an imaginary acute trapezoid, third and fourth peripheral corner points formed at the intersection of a second end surface and first and second side surfaces, respectively, define the end points of a second lateral side of the imaginary acute trapezoid, and the first and third peripheral corner points define the end points of a short base of the acute trapezoid, and the second and fourth peripheral corner points define the end points of a long base of the acute trapezoid. In a bottom view of the cutting insert: first and second lower abutment surfaces form an obtuse first tilt angle and are located inside the imaginary acute trapezoid.