Cutting Insert Rake Surface Redirection
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Solution Overview
Problem
Conventional cutting inserts with a breaker groove and constraining surface on the same surface face challenges in stable chip discharge and constraining stability due to chip collision and wear.
Innovation Solution
The cutting insert design features a first constraining surface formed on the inside of the major cutting edge, with an increased distance towards the minor cutting edge, which reduces chip collision and wear by allowing the rake surface to deform and redirect chips, ensuring constraining stability between the insert and holder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the constraining surface and breaker groove are formed in the same surface, then the structure is simplified, but chips collide with the constraining surface causing wear and unstable chip discharge
Solution Approach 1:
The invention relocates the constraining surface from the same surface as the breaker groove to an adjacent surface of the cutting insert. This dimensional repositioning allows chips to be redirected away from the constraining surface, preventing collision and wear while maintaining structural simplicity. The constraining surface is now formed on a different face of the insert body, creating spatial separation between chip flow path and constraining contact points.
2Stability of the object's composition
If the constraining surface is positioned close to the major cutting edge, then the constraining stability is improved, but chips generated at the major cutting edge collide with the constraining surface causing wear
Solution Approach 1:
The constraining surface is positioned on an adjacent surface rather than the same surface as the chip discharge path. This spatial reconfiguration allows the constraining surface to maintain close proximity to the major cutting edge for stability, while chips flow along a different trajectory that avoids contact with the constraining surface, thereby preventing wear.
Solution Approach 2:
The cutting insert is divided into distinct functional surfaces: the breaker groove on one surface for chip control, and the constraining surface on an adjacent surface for positional stability. This segmentation allows each surface to perform its specific function without interference, with chips being managed by the breaker groove and the constraining surface remaining protected from chip contact.
3Productivity
If the rake surface is positioned to deform chips, then chip discharge is improved, but the constraining surface remains vulnerable to chip collision
Solution Approach 1:
The rake surface is configured to deform and redirect chips along a specific path, while the constraining surface is positioned on an adjacent surface that lies outside this chip flow path. This dimensional arrangement allows effective chip deformation and discharge through the rake surface while the constraining surface remains protected from chip collision, maintaining both productivity and reliability.
Data Source
Figure 1
Figure 2(a)~2(b)
Figure 3(a)~3(c)
AI summary
An insert according to an embodiment of the present invention includes an upper surface, a lower surface, a side surface comprising a first side surface and a second side surface which are connected to each of the upper surface and the lower surface, and are adjacent to each other, and a cutting edge including a major cutting edge lying along an intersection of the upper surface and the first side surface, and a minor cutting edge lying along an intersection of the first side surface and the second side surface. The first side surface includes a first constraining surface located at a middle region in a thickness direction of the first side surface, and a rake surface which is located between the first constraining surface and the major cutting edge, and is recessed with respect to the first constraining surface and the major cutting edge. A distance between the major cutting edge and the first constraining surface is increased toward the minor cutting edge in a side view. A cutting tool including the cutting insert, and a method of manufacturing a machined product by using the cutting tool are also provided.