Double-Ended Cutting Insert for Grooving
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Solution Overview
Problem
Existing cutting tools for grooving, parting, and turning operations face challenges in achieving unlimited depths of cut without disturbing chip formation, particularly due to the design of the cutting insert and insert holder which can interfere with chip formation and limit cutting depth.
Innovation Solution
An indexable double-ended cutting insert with 180° rotational symmetry and a specialized insert holder with a resilient clamping jaw and base jaw design that securely holds the cutting insert, allowing for non-operative and operative cutting portions to maintain optimal cutting edge orientation and prevent chip jamming, enabling unlimited depth of cut without disturbing chip formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a cutting insert with a single cutting portion is used, then chip formation remains undisturbed, but the depth of cut is limited
Solution Approach 1:
The cutting insert is divided into two distinct cutting portions (front and rear cutting edges) positioned at different locations along the tool axis. This segmentation allows each cutting edge to perform cutting operations independently at different depths, enabling unlimited depth of cut while maintaining proper chip flow paths for each cutting portion
Solution Approach 2:
The invention transitions from a single cutting plane to a three-dimensional arrangement with cutting edges positioned at different axial locations. The front cutting edge operates at one depth while the rear cutting edge operates at a different depth, creating a multi-level cutting structure that enables grooving to unlimited depths without interfering with chip formation
2Length of moving object
If a double-ended cutting insert is used to achieve unlimited depth of cut, then the depth of cut is extended, but the jaw abutting the upper surface disturbs chip formation
Solution Approach 1:
The invention removes the interfering jaw element from the insert holder design. Instead of using a jaw that abuts the upper surface of the cutting insert (which disturbs chip formation), the holding mechanism is redesigned to secure the insert without any upper surface contact, allowing chips to flow freely along the tool axis without obstruction
Solution Approach 2:
The invention inverts the traditional holding mechanism by positioning cutting edges to engage the workpiece in a manner that eliminates the need for upper surface abutment. The cutting portions are oriented and positioned such that chip flow paths are cleared of obstructions, reversing the conventional approach where the holder structure interferes with chip evacuation
3Productivity
If a cutting insert with multiple cutting portions is used, then productivity increases, but the complexity of the insert holder increases
Solution Approach 1:
The invention merges the functions of multiple cutting portions into a single integrated insert design where both front and rear cutting edges are part of one monolithic insert structure. This unified design simplifies the holder requirements compared to separate tools, as the entire multi-functional insert is retained and positioned as a single unit without requiring complex multi-component holding mechanisms
Data Source
Figure 1
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AI summary
A cutting tool (12) for grooving, parting and turning machining operations capable of grooving to unlimited depths of cut. The cutting tool (12) includes an indexable double-ended cutting insert (16) having a downwardly extending insert clamping portion (22) resiliently clamped in a self - retaining manner in an insert pocket (18) so that chip formation is not hindered during such machining operations.