Double-Sided Cutting Insert Asymmetric Edge Offset for Deep Shoulder Milling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional double-sided cutting inserts for 90° shoulder milling are limited in cutting depth due to non-operative wiper edges protruding radially, restricting the cutting depth to be equal to or less than the length of the cutting insert.
Innovation Solution
A double-sided cutting insert design featuring diagonally symmetrical first and second cutting edges and wiper edges, with the second cutting edge offset inwardly from the first cutting edge radially and vice versa tangentially, allowing for deeper cutting depths by maintaining a gap between non-operative edges and the work-piece.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If conventional double-sided cutting insert design is used with wiper edges extending to the end surface, then the insert structure is simple and easy to manufacture, but the cutting depth is limited to be equal to or less than the length of the cutting insert due to non-operative wiper edges protruding radially
Solution Approach 1:
The cutting insert employs asymmetric edge configuration where the second cutting edge is offset toward the first median plane from the first cutting edge, and the first cutting edge is offset toward the second median plane from the second cutting edge. This asymmetric offset arrangement ensures that non-operative edges do not protrude radially outward, enabling cutting depth greater than the insert length while maintaining structural simplicity
Solution Approach 2:
The invention transitions from a conventional symmetric end-surface configuration to a diagonally symmetrical side-surface configuration. By forming cutting edges through the intersection of first and second side surfaces with diagonal symmetry, the design enables deeper cutting without radial protrusion of non-operative edges
2Length of moving object
If the cutting insert is designed to achieve cutting depth deeper than the insert length, then deeper shoulder milling is enabled, but the edge configuration becomes more complex with offset arrangements
Solution Approach 1:
The offset arrangement of cutting edges toward opposite median planes creates an asymmetric configuration that enables deeper cutting. The second cutting edge offsets toward the first median plane while the first cutting edge offsets toward the second median plane, simplifying the manufacturing process compared to fully asymmetric designs
Solution Approach 2:
The diagonally symmetrical configuration with offset cutting edges provides multi-functionality, enabling the insert to perform 90° shoulder milling at cutting depths exceeding the insert length while maintaining ease of manufacture through symmetrical geometric relationships
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The present invention relates to a cutting insert for shoulder milling cutting. The insert comprises rectangular end surfaces, first side surfaces and second side surfaces connecting the end surfaces and facing each other. First cutting edges and second cutting edges in the first side surface are diagonally symmetrical with respect to a first imaginary median plane, which transverses the middles of both the first side surfaces facing each other. The first cutting edges and the second cutting edges in the second side surface are diagonally symmetrical with respect to a second imaginary median plane, which transverses the middles of both the second side surfaces facing each other. The second cutting edge is offset toward the first median plane from the first cutting edge. The first cutting edge is offset toward the second median plane from the second cutting edge.