Hexagonal Cutting Insert Geometry for Ramping Clearance Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In cutting inserts, a small acute angle for the minor flank face to secure a clearance angle during ramping processes leads to an increase in the obtuse angle of the major flank face, causing interference with the work material, deterioration of cutting performance, and increased cutting resistance.
Innovation Solution
A cutting insert with hexagonal faces and side faces, where the major and minor cutting edges are alternately formed at intersecting ridgelines, and the major and minor flank faces are concavely folded, allowing for a smaller sum of flank face angles without increasing the obtuse angle of the major flank face, thus maintaining a large clearance angle and preventing axial rake angle deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the acute angle of the minor flank face is made small to secure the clearance angle during ramping process, then the clearance angle is improved, but the obtuse angle of the major flank face becomes larger causing interference with work material
Solution Approach 1:
The side face is segmented into two distinct regions: a major flank face with a large obtuse angle and a minor flank face with a small acute angle. This segmentation allows each region to be optimized independently - the major flank face prevents interference with work material while the minor flank face provides adequate clearance angle during ramping operations.
Solution Approach 2:
Different regions of the side face are given different angular characteristics tailored to their specific functional requirements. The major flank face region has a large obtuse angle optimized for preventing work material interference, while the minor flank face region has a small acute angle optimized for providing clearance during ramping. This local quality differentiation resolves the contradiction by allowing each region to have optimal properties for its specific purpose.
2Object-affected harmful factors
If the intermediate face is inclined more to prevent major flank face interference, then the interference is reduced, but the axial rake angles increase toward negative side deteriorating cutting performance
Solution Approach 1:
The side face is divided into major and minor flank faces with different angular characteristics. This segmentation eliminates the need to increase the intermediate face inclination, as the major flank face's large obtuse angle independently prevents work material interference without affecting the axial rake angles of the cutting edges.
Solution Approach 2:
The major flank face is given a large obtuse angle specifically optimized for preventing work material interference, while this local optimization does not propagate to affect the axial rake angles. This localized quality control allows interference prevention without the harmful side effect of deteriorating cutting performance.
3Manufacturing precision
If the sum of flank face angles is reduced, then the clearance angle is maintained, but the major flank face angle increases causing interference
Solution Approach 1:
The side face angular configuration is segmented into two independent angular regions. The major flank face angle and minor flank face angle are treated as separate parameters rather than being constrained by a fixed sum. This allows the minor flank face to maintain adequate clearance angle while the major flank face independently maintains a large obtuse angle to prevent work material interference.
Solution Approach 2:
Each flank face region is given local quality optimization independent of the other. The minor flank face region has angular characteristics optimized for clearance, while the major flank face region has angular characteristics optimized for preventing interference. This local quality approach breaks the constraint that the sum of flank face angles must be fixed.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A cutting insert has an insert major body (1) which includes two hexagonal faces (2) facing each other and six side faces (3) arranged around the two hexagonal faces (2), and is rotationally symmetrical at 120° intervals about an insert center line (C) passing through centers of the two hexagonal faces (2) and inversely symmetrical in front and back with respect to the two hexagonal faces (2), wherein a major cutting edge (5) and an minor cutting edge (6) are alternately formed in a circumferential direction in the single hexagonal face (2) at twelve intersecting ridgeline portions at which the hexagonal faces (2) and the side faces (3) intersect, the major cutting edge (5) is formed to be located at an intersecting ridgeline portion with one hexagonal face (2) while the minor cutting edge (6) is formed to be located at an intersecting ridgeline portion with the other hexagonal face (2) at a single side face (3), and a major flank face (11) connected to the major cutting edge (5) and an minor flank face (12) connected to the minor cutting edge (6) are formed to be concavely folded at a cross-section along the insert center line (C) at the side face (3).