Vertically Mounted Cutting Insert Ridges for Breakage Resistance
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Solution Overview
Problem
Vertically mounted cutting inserts experience breakage and instability due to radial cutting resistance, thin mounting holes, and sharp included angles, which lead to weakened edges and increased chip abrasion on restraint surfaces.
Innovation Solution
A vertically mounted cutting insert design featuring a reinforcing portion with integrated projecting ridges that extend between rake faces and the restraint surface, enhancing rigidity and separating cutting edges from the restraint surface to prevent chip abrasion, while optimizing the placement of reinforcing elements to maintain stability and reduce stress concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a vertically mounted insert is used with a mounting hole extending through the peripheral side surface, then the insert can be mounted vertically, but the fastening screw is bent in the radial direction due to radial cutting resistance, leading to larger mounting hole inner diameter and thinner portion between upper surface and mounting hole
Solution Approach 1:
The insert is divided into multiple functional surfaces: upper surface with cutting edges, lower surface with restraint surface, and peripheral side surface with mounting hole. The reinforcing portion is segmented into first, second, and third projecting ridges that extend from the restraint surface toward the upper surface, providing localized reinforcement without compromising vertical mounting capability
Solution Approach 2:
The insert employs a composite structure combining the cutting portion (upper surface with cutting edges and rake faces) and the restraint portion (lower surface with restraint surface and reinforcing portion). This composite design allows the insert to simultaneously achieve vertical mounting functionality and enhanced resistance to breakage through the integrated reinforcing ridges
2Area of stationary object
If the upper and lower surfaces are smaller in size due to no mounting hole in vertically mounted insert, then the included angle becomes sharp, but the strength of edge deteriorates and cutting edge is more likely to be chipped
Solution Approach 1:
The reinforcing portion is formed by adding a new dimension to the insert structure - the third projecting ridge extends in the thickness direction from the restraint surface toward the upper surface. This dimensional addition reinforces the sharp included angle region without increasing the planar surface area, thereby maintaining the compact vertical mounting geometry while improving edge strength
Solution Approach 2:
The reinforcing ridges are strategically positioned to provide localized reinforcement at critical stress points. The first and second projecting ridges extend along the boundaries between the rake faces and restraint surface, while the third projecting ridge connects them, creating localized strength enhancement precisely where the sharp included angle makes the cutting edges vulnerable to chipping
3Reliability
If chip flies out and abrades the rake face, then chip may reach the restraint surface and roughen it, but this causes unstable restraint state when cutting insert is turned upside down
Solution Approach 1:
The first and second projecting ridges act as intermediary barriers between the rake faces and the restraint surface. These ridges intercept chips that fly out from the cutting edges, preventing them from reaching and abrading the restraint surface. This intermediary structure maintains the reliability of the restraint state by protecting the restraint surface from chip contamination
Solution Approach 2:
The reinforcing portion is segmented into multiple projecting ridges that create separate protective zones. The first projecting ridge protects one rake face boundary, the second projecting ridge protects the other rake face boundary, and the third projecting ridge connects them, forming a segmented barrier system that effectively blocks chip paths to the restraint surface
Data Source
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AI summary
Provided is a cutting insert which is resistant to breakage and can stably be restrained. A cutting insert (2) configured as a vertically mounted insert has a first rake face (11R) adjacent to a first major cutting edge (11), a second rake face (14R) adjacent to a second major cutting edge (14), a restraint surface (19) located further inward than the first and second rake faces to come into contact with a tool body (3) when a second end surface (20) is used, and a reinforcing portion (40) projecting from the restraint surface. The reinforcing portion has a third projecting ridge (43) provided to extend between the first and second rake faces and halve the restraint surface, a first projecting ridge (41) connected to one end (431) of the third projecting ridge to extend so as to cover at least a portion of a boundary (B41) between the first rake face and the restraint surface, and a second projecting ridge (42) connected to another end (432) of the third projecting ridge so as to cover at least a portion of a boundary (B42) between the second rake face and the restraint surface.