Cutting Insert Abutment Ridge Geometry Against Torque Rotation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing cutting tools with planar peripheral contacts between the cutting insert and insert holder suffer from rotational displacement due to torque, leading to reduced precision and increased vibration during metalworking operations.
Innovation Solution
The cutting insert features converging peripheral abutment ridges on its rear and lower surfaces, which engage with corresponding abutment surfaces in the insert pocket, providing a secure, non-planar contact that stabilizes the insert and reduces rotational displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If planar peripheral contact between cutting insert and insert holder is used, then ease of manufacture is improved, but rotational displacement occurs due to torque leading to reduced precision
Solution Approach 1:
The patent applies curvature by replacing the planar peripheral contact surfaces with arc-shaped abutment ridges on the cutting insert that engage with corresponding arc-shaped abutment surfaces in the insert holder. This curved geometry creates a non-planar contact interface that resists rotational displacement while maintaining manufacturability through standardized arc profiles.
Solution Approach 2:
The peripheral contact interface is segmented into discrete abutment ridges positioned at specific locations around the cutting insert perimeter. These segmented contact points are strategically placed to maximize resistance against torque-induced rotation while simplifying the overall structure compared to a continuous curved surface.
2Device complexity
If planar peripheral contact is used, then device complexity is reduced, but stability against rotational displacement deteriorates
Solution Approach 1:
The curved abutment ridges and surfaces create a geometric interlock that passively resists rotational forces without requiring additional active components. The arc-shaped geometry naturally converts rotational torque into radial compressive forces, enhancing stability while maintaining simple device architecture.
Solution Approach 2:
The abutment ridges are positioned asymmetrically at optimized locations around the cutting insert perimeter, creating uneven contact distribution that maximizes resistance against rotational displacement. This asymmetric arrangement provides enhanced stability with minimal structural modification.
3Productivity
If cutting depth is increased, then productivity is improved, but vibration increases leading to reduced surface finish quality
Solution Approach 1:
The curved abutment interface provides continuous contact and support during deep cutting operations, damping vibrations through the geometric constraint. The arc-shaped ridges maintain stable engagement with the holder even under increased cutting depths, preventing the insert from vibrating or rotating during the cutting process.
Solution Approach 2:
Instead of trying to reduce cutting depth to eliminate vibration, the patent inverts the approach by enhancing the mechanical constraint through curved abutment surfaces. This inverted strategy allows deep cuts to be made stable by improving the insert-holder interface geometry rather than limiting the cutting parameters.
Data Source
Figure 1~2
Figure 3~5
Figure 6~7
AI summary
A cutting insert includes an insert longitudinal axis defining a forward to rear direction, opposing insert inner and outer side surfaces and an insert peripheral surface extending therebetween. The insert peripheral surface includes an insert rear end surface and an adjacent insert lower surface. The cutting insert includes two spaced apart peripheral abutment ridges that are distal the insert outer side surface and extend along the insert rear end surface and the insert lower surface, respectively. The two peripheral abutment ridges converge towards each other at an acute insert wedge angle in a rearward direction of the cutting insert, away from a cutting edge.