Vertically Mounted Cutting Insert With Reinforcing Ridges
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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 damage.
Innovation Solution
A vertically mounted cutting insert design featuring a reinforcing portion with integrated projecting ridges that extend between rake faces and a 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 may be bent in the radial direction and the inner diameter of the mounting hole must be larger, resulting in a thinner portion between the upper surface and the mounting hole that is more likely to break
Solution Approach 1:
The insert is divided into multiple functional surfaces: upper surface, lower surface, peripheral side surface, and end surfaces. The mounting hole is specifically positioned to extend through the peripheral side surface rather than through the upper and lower surfaces, segmenting the structural load paths and allowing the fastening screw to be secured without creating thin portions that would compromise strength.
Solution Approach 2:
The mounting hole is repositioned from a conventional axial orientation (through upper and lower surfaces) to a radial orientation (through the peripheral side surface). This dimensional change allows vertical mounting capability while avoiding the creation of thin portions between the upper surface and mounting hole, thereby maintaining structural strength and resistance to breakage.
2Ease of operation
If the upper and lower surfaces are smaller in size due to no mounting hole, then the insert can be vertically mounted, but the level difference between restraint surface and cutting edge is large, resulting in a sharp included angle that weakens the edge and makes it more likely to chip
Solution Approach 1:
The insert geometry is segmented into distinct functional zones: cutting edges on the upper and lower surfaces, restraint surfaces on the end surfaces, and peripheral side surfaces. This segmentation allows the upper and lower surfaces to be optimized for cutting functionality while the end surfaces provide adequate restraint surface area, eliminating the need to reduce surface size for mounting purposes.
Solution Approach 2:
The mounting hole is repositioned to extend through the peripheral side surface rather than through the upper and lower surfaces. This dimensional repositioning allows the upper and lower surfaces to maintain their full size and geometry, ensuring adequate included angles and edge strength while still enabling vertical mounting capability.
3Productivity
If the first and second rake faces are adjacent to the cutting edges, then cutting performance is optimized, but chip may abrade the restraint surface and roughen it, causing unstable restraint when the insert is reused
Solution Approach 1:
A chip groove is introduced as an intermediary feature between the rake faces and the restraint surfaces. This chip groove captures and contains chips during the cutting process, preventing them from traveling across and abrading the restraint surfaces. The restraint surfaces remain smooth and clean, ensuring stable restraint and reliable performance when the insert is reused.
4Ease of operation
If the mounting hole inner diameter is larger to accommodate the vertically mounted insert, then the insert can be mounted vertically, but the thinner portion between the upper surface and mounting hole is more likely to break
Solution Approach 1:
The mounting hole is repositioned from an axial orientation (through upper and lower surfaces) to a radial orientation (through the peripheral side surface). This dimensional change eliminates the creation of thin portions between the upper surface and mounting hole, maintaining structural integrity and resistance to breakage while enabling vertical mounting capability.
Data Source
AI summary
Provided is a cutting insert which is resistant to breakage and can stably be restrained. A cutting insert configured as a vertically mounted insert has a first rake face adjacent to a first major cutting edge, a second rake face adjacent to a second major cutting edge, a restraint surface located further inward than the first and second rake faces to come into contact with a tool body when a second end surface is used, and a reinforcing portion projecting from the restraint surface. The reinforcing portion has a third projecting ridge provided to extend between the first and second rake faces and halve the restraint surface, a first projecting ridge connected to one end of the third projecting ridge to extend so as to cover at least a portion of a boundary between the first rake face and the restraint surface, and a second projecting ridge connected to another end of the third projecting ridge so as to cover at least a portion of a boundary between the second rake face and the restraint surface.