Twisted Flank Cutting Insert for Stable Multi-Orientation Use
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Solution Overview
Problem
The existing cutting inserts with twisted flank faces face issues in maintaining a smooth side face formation and stable attachment when applied to cutting inserts with front-back inversion symmetry, leading to potential steps and deviations in flank face positions, affecting flank amount and cutting edge stability.
Innovation Solution
The cutting insert is designed with a major cutting edge that inclines toward the opposite side of the polygonal face, forming a twisted flank face with increasing flank angle, ensuring smooth flank face continuation and stable attachment by adjusting the intersection of side ridge portions and using convex curved surfaces for contact portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the flank face is formed in the shape of a twisted face with increasing flank angle, then the rake angle and flank angle can be maintained over the entire cutting edge length, but the side face formation becomes uneven and steps occur between flank faces
Solution Approach 1:
The patent applies asymmetry by making the flank face a twisted face with non-uniform geometry. Specifically, the flank face is designed so that the flank angle gradually increases from the tip of the cutting edge to the rear end, creating an asymmetric surface that compensates for angle variations along the cutting edge length while maintaining overall side face smoothness
Solution Approach 2:
The patent changes the geometric parameters of the flank face by varying the flank angle along the cutting edge length. The flank angle is not constant but gradually increases from tip to rear end, allowing the surface to maintain appropriate cutting angles throughout the entire edge while preventing step formation between adjacent flank faces
2Adaptability or versatility
If the cutting insert is designed with front-back inversion symmetry, then the insert can be used in multiple orientations, but the flank face position deviates and attachment stability decreases
Solution Approach 1:
The patent introduces asymmetry through the twisted face configuration of the flank face, which breaks the front-back inversion symmetry. This asymmetric design ensures that the flank face maintains a consistent position relative to the cutting edge regardless of the insert's orientation in the insert seat, thereby improving attachment stability while still allowing for multi-orientation usage
Solution Approach 2:
The patent applies curvature by forming the flank face as a twisted face with continuous surface curvature. This curved geometry allows the flank face to adapt to different insert orientations while maintaining stable contact with the insert seat, preventing position deviation and ensuring reliable attachment
Data Source
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AI summary
A cutting insert and an indexable insert-type cutting tool includes a cutting edge (6A) formed on each of a pair of side ridge portions of at least one of the side faces, the pair of side ridge portions being a portion intersecting the side face and a pair of polygonal faces (2), wherein an insert main body (1) is formed in the shape of having front-back inversion symmetry which is 180° rotationally symmetrical with respect to a line of symmetry (N) passing through the center of the side faces; a flank face adjacent to the cutting edge (6A) is formed on the side face in the vicinity of each of the pair of polygonal faces (2), when each of the pair of polygonal faces (2) is used as a rake face; each of the flank faces is formed in the shape of a twisted face in which a flank angle with respect to the cutting edge (6A) gradually increases in a positive angle side while each of the flank faces becoming close to a second corner portion (B) from a first corner portion (A), the first corner portion and the second corner portion being alternately located in a circumferential direction of the pair of polygonal faces (2) at a side ridge portion where the cutting edge (6A) is formed; the pair of side ridge portions on which the cutting edge (6A) is formed intersect each other in such a manner that the second corner portion (B) of one side ridge portion protrudes outside the other side ridge portion when the polygonal face (2) is viewed from the front thereof.