Turning Insert Interface With Deeper Central Flanks for Breakage Resistance
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Solution Overview
Problem
Existing turning tools experience breakage at the longitudinal sides of cutting inserts during operation due to inadequate support and force distribution, leading to reduced durability and efficiency in metal cutting processes like grooving or parting.
Innovation Solution
The design of a turning insert with a support body featuring alternating ridges and grooves, where the central main pair of flanks are deeper than the auxiliary flanks, providing enhanced strength and force distribution, thereby reducing the risk of breakage and ensuring stable support during metal cutting operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cutting insert uses uniform flanks throughout the interface, then the total flank area is maximized for stable support, but the lateral sides become prone to breaking due to excessive force concentration
Solution Approach 1:
The insert interface features non-uniform flank depths where the central main pair of flanks are deeper than the auxiliary flanks at the lateral sides. This local differentiation allows the central flanks to bear the majority of cutting forces while the shallower lateral flanks provide stable support without being prone to breaking, thus resolving the contradiction between strength and reliability.
2Force
If the central main pair of flanks are made deeper, then they can bear a larger proportion of forces, but the lateral side flanks become weaker and more prone to chipping
Solution Approach 1:
The insert interface features non-uniform flank depths where the central main pair of flanks are deeper than the auxiliary flanks at the lateral sides. This local differentiation allows the central flanks to bear the majority of cutting forces while the shallower lateral flanks provide stable support without being prone to breaking, thus resolving the contradiction between strength and reliability.
3Stability of the object's composition
If all flanks are made equally deep, then the interface provides uniform support, but the lateral sides are still prone to breaking under side forces
Solution Approach 1:
The insert interface features non-uniform flank depths where the central main pair of flanks are deeper than the auxiliary flanks at the lateral sides. This local differentiation allows the central flanks to bear the majority of cutting forces while the shallower lateral flanks provide stable support without being prone to breaking, thus resolving the contradiction between strength and reliability.
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
The present invention relates to turning insert, a turning tool body and turning tool for cutting metal workpieces, preferably by grooving or parting. The turning insert comprises at least one cutting head and a support body (7) extending rearward from the cutting head (5) .The support body (7) comprises a top surface (14) and a bottom surface (15), which each extend longitudinally rearward form the cutting head, which both comprise one insert interface (18) each for. Each insert interface (18) comprises a set of flanks (19, 22) forming alternating parallel, straight and rearward extending ridges (20) and grooves (21), wherein the ridges (20) and grooves (21) extend in a length direction. Each flank (19, 22) of each set of flanks extends from an outer peak (26) of an associated ridge (20) to an inner bottom (24) of an associated groove (21), Each set of flanks (19, 22) comprises a central main pair of flanks (22), which consists of the first flank on a respective lateral side of the longitudinal axis (8). At least along a major portion of the extension in the length direction of the flanks (19, 22), as seen in the cross section perpendicular to the length direction, the depth (31) of the central main pair of flanks (22) is larger than the depth (31) of all other flanks (19) of the same insert interface (18).