Grooving Cutting Insert Geometry for Short-Chip Partial Cuts
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Solution Overview
Problem
Existing cutting inserts are not well-suited for partial cuts, leading to undesirable chip formation and potential damage due to long chip formation, which affects process reliability and tool/workpiece safety.
Innovation Solution
A cutting insert with a rectilinear main cutting edge and a chamfer divided into three sections, where the chamfer is oriented at a negative rake angle relative to the xy plane, and a chip trough with specific wall geometry that stabilizes the cutting edges and influences chip formation, allowing for improved chip control and breakage during both full and partial cuts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the cutting insert is designed for full cuts with a specific chip-forming geometry, then chip formation is optimized for full cuts, but chip formation deteriorates during partial cuts resulting in long chips
Solution Approach 1:
The chamfer is divided into three distinct sub-areas (first, second, and third sub-areas) that are arranged in a common chamfer plane. Each sub-area serves a specific function in chip formation during partial cuts, allowing the cutting insert to handle different cutting scenarios effectively.
Solution Approach 2:
Different regions of the cutting insert have specialized geometries tailored to their specific functions. The chip trough includes a wall with five wall regions having different profiles, and the chamfer has three sub-areas with distinct orientations and positions, optimizing chip control for both full and partial cuts in their respective zones.
2Productivity
If the main cutting edge is designed for full width contact, then full cut performance is optimized, but partial cut chip control deteriorates
Solution Approach 1:
The chamfer is segmented into three sub-areas that work together to control chip formation during partial cuts. The first sub-area is arranged adjacent to a first end of the main cutting edge, the second sub-area extends along at least a large part of the main cutting edge, and the third sub-area is arranged adjacent to a second end of the main cutting edge.
Solution Approach 2:
The solution moves from a two-dimensional chip control approach to a three-dimensional approach by introducing a chamfer plane that is inclined relative to the cutting area plane. This adds a vertical dimension to chip control, allowing chips to be guided and broken more effectively during partial cuts.
3Ease of manufacture
If the chip trough geometry is simplified, then manufacturing is easier, but chip breaking control deteriorates
Solution Approach 1:
The wall of the chip trough is divided into five wall regions that adjoin one another in ascending order. The profile line of the wall is segmented into five sub-sections corresponding to these wall regions, with specific concave and rectilinear/convex characteristics in different sections, enabling precise chip control.
Solution Approach 2:
The chip trough geometry employs asymmetric design elements, particularly in the wall profile where the first, third, and fifth sub-sections are concave while the second and fourth sub-sections are rectilinear or convex. This asymmetric configuration optimizes chip flow and breaking control.
Data Source
Figure 1~2
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AI summary
A cutting insert (10) for a tool (16) for machining. The cutting insert (10) is suitable in particular for grooving tools for grooving. The cutting insert (10) has, in its lip region (12), a chip breaker geometry, which allows machining of full cuts and machining of partial cuts and machining of webs. In particular on account of the shaping of a chip pocket (26) provided in the lip region (12) and on account of the presence of a negative chamfer (28), very short chips can be created in all three machining variants, with the result that there is high process reliability and long service lives are made possible.