Cutting Insert Holder With Converging Wedge Abutments
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Solution Overview
Problem
Existing cutting tools face issues with stability during metal cutting operations, particularly in extreme conditions and thread turning, and lack precise control over the cutting edge geometry.
Innovation Solution
A cutting tool design featuring a cutting insert and insert holder with male and female type engagement members, where the interface includes sloping abutment surfaces that allow for a clamping force to securely engage the cutting insert, enhancing stability and precision through converging abutment surfaces and a clamping mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional planar contact interface is used between cutting insert and holder, then the structure is simple, but the stability during metal cutting operations is insufficient
Solution Approach 1:
The contact interface is segmented into multiple discrete abutment surfaces (first pocket side abutment surface, second pocket side abutment surface, first insert side abutment surface, second insert side abutment surface) arranged at specific angles around the central axis, replacing a single planar contact surface with multiple distributed contact points that collectively provide enhanced stability
Solution Approach 2:
Different regions of the interface are assigned different functional qualities: the pocket wedge abutment surface provides clamping force, the support abutment surface provides vertical support, and the side abutment surfaces provide lateral positioning, with each surface optimized for its specific function
2Manufacturing precision
If non-planar contact interface with protrusions and recesses is used, then engagement is improved, but the corner height precision of cutting edge is compromised
Solution Approach 1:
The interface design transitions from two-dimensional planar contact to three-dimensional angular surfaces that converge toward the central axis, creating a conical or frustoconical geometry that provides both mechanical engagement and precise positioning of the cutting insert relative to the holder
3Reliability
If conventional engagement mechanism is used, then the device complexity is low, but the stability during thread turning operations is insufficient
Solution Approach 1:
The abutment surfaces are pre-configured with specific angular orientations and convergence characteristics that automatically provide stable engagement when the cutting insert is mounted, eliminating the need for additional adjustment mechanisms or complex fastening systems
Data Source
AI summary
A cutting tool having a cutting insert releasably retained in insert pocket by a fastening member. The insert pocket has first and second side surfaces. The insert pocket has a base surface which includes at least one male or female type pocket engagement member which includes at least one sloping pocket wedge abutment surface. The insert has first and second side abutment surfaces. The cutting insert has an insert lower surface which includes at least one male or female type insert engagement member which includes at least one sloping insert wedge abutment surface. By virtue of the sloping orientation of the at least one pocket wedge abutment surface and the at least one insert wedge abutment surface, a clamping force applied by the fastening member urges said surfaces to slide over each other so that the cutting insert sits firmly in the insert pocket.