Chip-Forming Cutting Tool Geometry for Low-Friction Chip Guidance
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Solution Overview
Problem
Existing cutting tools for peeling-type machining face challenges in minimizing chip friction, reducing cutting forces, and improving chip guidance while maintaining low cutting resistance.
Innovation Solution
The cutting tool features raised chip-forming elements with an elongated contour, a rising flank with a specific angle, and a falling flank with a different angle, ensuring safe chip guidance and minimizing chip friction by allowing partial contact with the rake surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If chip grooves extend substantially parallel to the secondary edge, then the outgoing chip is lifted away from the workpiece, but chip guidance is inadequate and the outgoing chip is uncontrollable
Solution Approach 1:
The chip groove is segmented into multiple sections with different orientations: a first section extending parallel to the secondary edge for lifting the chip, and a second section extending parallel to the primary edge for guiding the chip. This segmentation allows each section to perform its specific function effectively, resolving the contradiction between chip lifting and chip guidance.
Solution Approach 2:
The chip groove transitions from a two-dimensional groove to a three-dimensional structure by adding a cross-section that includes a chip breaker and raised portions. This dimensional change enables the groove to simultaneously lift, guide, and control the chip through multiple geometric features working in conjunction.
2Ease of operation
If chip grooves with two laterally limited protrusions are used, then chip guidance is improved, but cutting resistance increases
Solution Approach 1:
The raised portions in the cross-section of the chip groove are strategically positioned to provide chip guidance only where needed, while maintaining open spaces that allow chip flow with minimal resistance. The local quality of the groove structure is optimized to balance guidance and resistance reduction.
Solution Approach 2:
Instead of completely enclosing the chip with solid protrusions, the invention uses partial raised portions that provide sufficient guidance while leaving adequate space for chip flow. This partial action reduces cutting resistance while maintaining effective chip guidance.
3Productivity
If the rising flank has a steep angle, then chip formation is effective, but friction and heat generation increase
Solution Approach 1:
The rising angle of the chip groove is optimized to a specific range (5° to 15°) that balances chip formation effectiveness with friction reduction. This parameter change ensures efficient chip formation while minimizing heat generation and tool temperature rise.
4Ease of operation
If the falling flank has a shallow angle, then chip flow is smooth, but chip control and breaking capability are reduced
Solution Approach 1:
The falling flank is segmented into multiple sections with progressively changing angles. The first section has a shallow angle for smooth chip flow, while subsequent sections have increasing angles that enhance chip control and breaking capability. This segmentation allows the falling flank to perform multiple functions sequentially.
Solution Approach 2:
The chip groove structure incorporates periodic raised portions and cross-sectional features that create a rhythmic pattern of chip guidance and control. This periodic structure maintains smooth chip flow while periodically enhancing chip breaking capability.
Data Source
AI summary
The invention relates to a cutting tool for machining, in particular for a peeling-like machining process, comprising a chip-forming depression which runs along the cutting edge and in which elevated chip-forming elements are formed. According to the invention, the elevated chip-forming elements have an elongated contour with a length which is greater than the width, in plan view, such that the chip-forming elements have a rising flank and a falling flank. The rising flank, which is longer by comparison, is defined by a rising angle (α) of 3° to 20°, preferably 5° to 10°, and a falling angle (β) of 25° to 45°, preferably 27° to 35°, and the transition between the rising flank and the falling flank is rounded, the radius (R) of said rounded section ranging between 0.05 mm and 1 mm, preferably between 0.25 mm and 0.4 mm.