Drill Insert Chip Breaker Geometry for Chip Control and Edge Strength
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Solution Overview
Problem
Existing metal cutting drill inserts with varying chip breaker geometries face challenges in maintaining cutting edge strength and effective chip control, particularly in long chipping materials like low carbon steel and stainless steel.
Innovation Solution
A metal cutting drill insert design featuring a chip breaker with a first groove of constant width and depth, a second groove with increasing width and constant depth, and a transitional groove connecting the two, which maintains cutting edge strength and enhances chip steering and formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a chip breaker with varying geometry is used to improve chip control, then chip formation and steering are enhanced, but the strength of the cutting edge is reduced
Solution Approach 1:
The chip breaker is segmented into multiple grooves with different functions: a first groove for initial chip breaking, a second groove for chip steering, and a transitional groove connecting them. This segmentation allows each groove to be optimized for its specific function while maintaining overall structural integrity.
Solution Approach 2:
Different regions of the chip breaker have different geometric properties tailored to their specific functions. The first groove has constant width and depth for consistent chip breaking, the second groove has increasing width for effective chip steering, and the transitional groove provides smooth geometric transition. This local optimization achieves superior chip control without compromising overall strength.
2Ease of operation
If a chip breaker with varying geometry is used to improve chip control, then chip formation is enhanced, but the manufacturing complexity increases
Solution Approach 1:
The chip breaker geometry is defined by controlled parameter variations: the second groove has a width that increases along its length while maintaining constant depth, and the transitional groove provides smooth parameter transition between the first and second grooves. These parameter changes are designed to achieve optimal chip formation and steering while remaining manufacturable.
3Ease of operation
If the second chip groove has increasing width to improve chip steering, then chip evacuation is enhanced, but the structural uniformity is reduced
Solution Approach 1:
The chip breaker is divided into functionally distinct segments: the first groove with constant dimensions for structural uniformity, the second groove with increasing width for chip steering, and the transitional groove for smooth connection. This segmentation allows the increasing width feature to be localized to where it is most needed for chip control, while other regions maintain structural uniformity.
Solution Approach 2:
The varying width of the second groove is applied locally only in the region where chip steering is most critical, while the first groove and other regions maintain constant dimensions for structural strength. This localized variation achieves superior chip steering without compromising overall structural uniformity.
Data Source
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AI summary
A metal cutting drill insert (100) for a drill tool (500), comprising: opposing top surface (101) and bottom surface (102) with a symmetry axis of the cutting drill insert extending there between, and a peripheral side surface (103) extends between said top surface and said bottom surface, wherein the top surface comprises a rake face (104) and the side surface (103) comprises a clearance face (105); at least one cutting edge (106) is formed at an intersection of the rake face (104) of the top surface (101) and an adjoining clearance face (105) of the side surface (103), at least one chip breaker (107) is formed in the rake face (104) adjacent to and along the cutting edge (106); characterized in that the at least one chip breaker (107) comprises: a first chip groove (108) with a constant width (w1) and constant depth (d1) relative the cutting edge (106); a second chip groove (110) with an increasing width, and a constant depth (d2) relative the cutting edge (106), and a transitional chip groove (109) which connects the first chip groove (108) to the second chip groove (110).