Turning Tool Path Segmentation for Concave Stock Removal
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Solution Overview
Problem
Current methods for generating tool paths in metal cutting, particularly in turning operations, often result in inefficient machining times, reduced tool life, and increased risk of insert breakage due to excessive cutting depth and chip hammering, especially when machining concave portions without prior material removal.
Innovation Solution
A computer-implemented method for generating a tool path cycle that divides the workpiece into segments with border lines spaced apart from mid-points of concave portions, allowing the turning tool to move in specific directions along the X-axis and Z-axis to reduce insert breakage risk and distribute wear evenly, thereby improving tool life and surface finish.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the turning tool machines concave portions without prior material removal, then machining time is reduced, but the risk of insert breakage and chip jamming increases
Solution Approach 1:
The method performs preliminary material removal from concave portions before machining the main body of the workpiece. By removing material in advance from difficult-to-reach concave areas, the tool path is optimized to avoid excessive cutting depths and chip jamming during subsequent machining operations, thereby reducing insert breakage risk while maintaining efficient machining time
Solution Approach 2:
The tool path is divided into multiple segments with different cutting directions. The method segments the machining process into radial cuts, axial cuts, and contouring cuts, allowing the tool to approach concave portions from multiple directions rather than attempting to machine them in a single pass, which reduces cutting depth and prevents chip jamming
2Manufacturing precision
If the turning tool moves in multiple directions to machine all portions of the target shape, then manufacturing precision is improved, but tool life is reduced
Solution Approach 1:
The method employs periodic cutting directions in the tool path, alternating between radial and axial cuts in a systematic sequence. This periodic pattern allows the cutting tool to periodically engage and disengage from the workpiece, reducing continuous tool wear while maintaining precision through repeated passes that progressively refine the target shape
Solution Approach 2:
The tool path performs preliminary roughing passes that remove the majority of material before final finishing passes. This preliminary action reduces the total tool wear during critical finishing operations, extending tool life while ensuring manufacturing precision is achieved in the final passes
3Productivity
If excessive cutting depth is used to remove stock efficiently, then productivity is improved, but the risk of chip hammering and insert breakage increases
Solution Approach 1:
The method segments the stock removal process into multiple shallow cutting passes instead of attempting to remove all material in a single deep cut. By dividing the total cutting depth into incremental steps, the tool maintains efficient stock removal while avoiding excessive cutting depth that causes chip hammering and insert breakage
Solution Approach 2:
The tool path implements periodic cutting with alternating radial and axial directions, creating a rhythmic cutting pattern that periodically reduces cutting depth. This periodic variation prevents continuous excessive cutting depth, allowing chips to be effectively evacuated and reducing chip hammering while maintaining overall productivity
Data Source
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AI summary
A computer-implemented method for generating a tool path cycle for removing stock (12) from a blank by means of a turning tool (1), the turning tool (1) comprising first and second cutting edges (2, 3) connected by a convex nose cutting edge (4), such that a predefined target shape (5) is formed, comprising the steps of: receiving an input of a blank shape (10), receiving an input of the target shape (5) setting of an offset distance (m), receiving an input of a turning tool (1), setting a first cut direction (25) and a second cut direction (26), dividing the first layer (11) into segments (16, 17, 18) separated by the border lines (19, 20), such that one longitudinal set of segments (11, 18, 43) is adjacent to the longitudinal portions (9, 21, 39) such that one radial set of segments (17, 42, 44) is adjacent to the radial portions (8, 38, 40), if the first cut direction (25) is along the Z-axis, removing the longitudinal set of segments (11, 18, 43), followed by removing the radial set of segments (17, 42, 44), if the first cut direction (25) is along the X-axis, removing the radial set of segments (17, 42, 44), followed by removing the longitudinal set of segments (11, 18, 43).