Cutting Insert With Inclined Side Surfaces For Stable Fixation
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Solution Overview
Problem
Existing cutting inserts face instability when attached to a holder due to lateral loads, causing shear stress and making it difficult to stably fix the insert.
Innovation Solution
The cutting insert design features a through hole with a central axis that includes inclined surfaces on the side surface, forming a stable fixing region with parallel surfaces to the axis, enhancing the insert's stability during attachment and reducing excessive load on the screw.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the major flank surface is inclined to depart from the central axis of the through hole, then it is easier for the insert to slide toward the workpiece, but the bolt is subjected to large lateral load and shear stress, making it difficult to stably fix the insert
Solution Approach 1:
The side surface is divided into two distinct regions: a first region with an inclined surface that facilitates sliding, and a second region with a flat surface that provides stable fixation. This segmentation allows each region to fulfill its specific function without compromising the other.
Solution Approach 2:
Different portions of the side surface are given different geometric properties: the first portion has an inclined surface for ease of sliding, while the second portion has a flat surface perpendicular to the central axis for stable fixation. This local differentiation resolves the contradiction between sliding ease and fixation stability.
2Ease of operation
If the major flank surface is inclined to depart from the central axis, then lateral sliding is facilitated, but the bolt experiences excessive shear stress
Solution Approach 1:
The side surface is segmented into a sliding region and a fixation region, allowing the inclined surface to handle lateral movement while the flat surface region supports the bolt, thereby distributing and reducing shear stress on the fastening element.
Solution Approach 2:
The flat surface region acts as an intermediary between the inclined surface and the bolt, providing a stable base that reduces the shear stress transmitted to the bolt while still allowing the inclined portion to facilitate lateral sliding.
3Ease of manufacture
If the side surface is inclined to improve sliding, then insertion is easier, but the insert cannot be stably fixed to the holder
Solution Approach 1:
The side surface is divided into a first region with inclination for easy insertion and a second region with a flat surface for stable fixation, allowing both insertion ease and fixation reliability to be achieved simultaneously.
Solution Approach 2:
The side surface exhibits local quality variation: the first region has inclined geometry for insertion ease, while the second region has flat geometry perpendicular to the central axis for fixation stability, resolving the contradiction between these two requirements.
Data Source
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AI summary
A cutting insert (1) comprises: an upper surface (3) comprising a plurality of side parts; a lower surface (5) comprising a plurality of side parts; a side surface located (7) between the upper surface (3) and the lower surface (5); an upper cutting edge (9) being located along one of the side parts on the upper surface (3) and comprising a first upper cutting edge (23) and a second upper cutting edge (25); a lower cutting edge (11) being located along one of the side parts on the lower surface (5) and comprising a first lower cutting edge (27) and a second lower cutting edge (29); and a through hole (13) extending between the upper surface (3) and the lower surface (5), wherein the first lower cutting edge (27) is located below the second upper cutting edge (25) and the second lower cutting edge (29) is located below the first upper cutting edge (23), wherein the side surface (7) comprises a first surface (15) extending downward from the second upper cutting edge (25), a second surface (17) extending upward from the first lower cutting edge (27), a third surface (19) extending downward from the first upper cutting edge (23), and a fourth surface (21) extending upward from the second lower cutting edge (29), wherein the second surface (17) is inclined so as to further depart from the central axis (O1) than the first surface (15) as going from the lower surface (5) toward the upper surface (3), wherein the third surface (19) is inclined so as to further depart from the central axis (O1) than the fourth surface (21) as going from the upper surface (3) toward the lower surface (5).