Turning Rough-Cut Path Generation Within Finishing Allowance
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Solution Overview
Problem
Conventional machining path generation devices for turning processes require extensive time and effort to create programs for rough cutting cycles, especially for complex shapes, leading to longer cutting paths and increased cycle times due to the need to maintain finishing allowances, and often result in incomplete cutting that necessitates additional processing steps.
Innovation Solution
A machining path generation device that includes a storage unit for cutting start and end points, a finishing allowance permitted range setting unit, and a cutting path generation unit that connects these points within a permitted range, allowing for the optimization of cutting paths by compensating provisional paths that exceed the allowed range and reducing interference with product shapes, thereby shortening the cutting path and cycle time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the cutting path is set to run along the finished shape to maintain finishing allowance, then the machining precision is improved, but the cutting path length increases and cycle time increases
Solution Approach 1:
The invention applies partial action by removing material beyond the finished shape in specific regions where it is safe to do so. The cutting path intentionally exceeds the finished shape boundaries in areas where the excess material will be removed in subsequent finishing operations, allowing the roughing phase to be more aggressive and faster while still achieving the final precision requirements.
Solution Approach 2:
The invention segments the workpiece surface into different regions: finished surface regions where precision must be maintained and non-finished surface regions where material can be aggressively removed. By dividing the machining area into these zones and applying different cutting strategies to each, the system optimizes both precision and efficiency.
2Productivity
If the cutting path is shortened to reduce cycle time, then the productivity is improved, but the finishing allowance may be compromised and machining precision deteriorates
Solution Approach 1:
The system performs excessive material removal in non-finished surface regions during roughing, creating a shorter cutting path. The finishing allowance is selectively applied only where needed for final precision, allowing aggressive roughing in areas that will be reworked anyway.
Solution Approach 2:
Different quality requirements are applied to different regions of the workpiece. Finished surface regions maintain strict finishing allowance constraints for precision, while non-finished surface regions allow greater material removal for productivity. This local differentiation resolves the contradiction between speed and precision.
3Productivity
If rough cutting is performed with aggressive material removal to shorten cutting path, then the productivity is improved, but incomplete cutting occurs and additional processing steps are required
Solution Approach 1:
The system performs preliminary identification of finished and non-finished surface regions before generating the cutting path. By预先 determining which areas require precise finishing allowance maintenance and which areas can tolerate aggressive removal, the system avoids incomplete cutting and the need for additional corrective processing steps.
Data Source
AI summary
A machining path generation device which generates a cutting path upon rough cutting a workpiece by a turning process, and a numerical control device equipped therewith, are provided to shorten the path during rough cutting, and thus reliably shorten the cycle time. The device includes a storage unit which stores information of a cutting start point and a cutting end point of rough cutting; a finishing allowance permitted range setting unit which sets a finishing allowance permitted range for a finishing step; and a cutting path generation unit which generates a cutting path connecting the cutting start point and the cutting end point in a cross-sectional view in a direction along a rotation axis line of the workpiece, the cutting path arranged within the finishing allowance permitted range, and shorter than a path following along a shape line of a product form.