CNC Programming for Lathe Overlap Segmentation
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Solution Overview
Problem
Existing numerical control programming methods for machine tools often result in the formation of useless worked regions due to overlap between adjacent worked areas, leading to level differences and uncut portions, even when attempting to prevent these issues.
Innovation Solution
A numerical control programming method that involves storing and analyzing solid models of part and material shapes, forming lathe shapes, and determining overlap amounts to delete unnecessary shapes in overlap areas, ensuring that only necessary regions are worked on, thereby preventing uncut portions and level differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If adjacent worked regions are made to overlap to eliminate uncut portions and level differences, then manufacturing precision is improved, but useless worked regions are formed reducing productivity
Solution Approach 1:
The worked regions are segmented into effective and useless portions. The programming method identifies and excludes the useless overlap portions from machining operations, while maintaining the necessary overlap to eliminate uncut portions and level differences. This segmentation allows precise control over which regions are actually machined.
Solution Approach 2:
The invention applies partial action by machining only the necessary effective portions of the worked regions while deliberately excluding the excessive useless overlap portions. This ensures that machining occurs only where needed to achieve surface continuity without wasting time on redundant operations in overlapping areas.
2Manufacturing precision
If overlap amount between adjacent worked regions is increased to prevent uncut portions, then manufacturing precision is improved, but the amount of useless worked regions increases reducing productivity
Solution Approach 1:
The overlap region is segmented into effective and useless portions based on the tool trajectory analysis. The programming method calculates which specific sub-regions within the overlap area are actually needed for eliminating uncut portions, and excludes the remaining useless portions from machining operations.
Solution Approach 2:
The invention dynamically adjusts the effective overlap amount by analyzing tool trajectories and material removal patterns. Instead of using a fixed overlap amount, the system determines the precise minimum overlap needed to eliminate uncut portions while excluding excess overlap from machining operations.
3Manufacturing precision
If tool trajectory is corrected to include all line segments in the cutting region, then manufacturing precision is improved, but the complexity of programming increases
Solution Approach 1:
The programming system automatically performs trajectory analysis, overlap identification, and effective region determination without requiring manual intervention. The system self-services by computing the effective and useless portions of worked regions and generating the optimized machining program autonomously.
Solution Approach 2:
The invention replaces manual trajectory correction methods with automated computer-based analysis. The system uses computational algorithms to analyze tool trajectories, identify effective versus useless worked regions, and generate optimized machining programs, substituting manual programming complexity with automated computational processing.
Data Source
AI summary
A level difference or a uncut portion is prevented from being left between adjoining worked regions without forming any useless worked region. A lathe sectional shape forming unit (222) produces a sheet model of a lathe sectional shape in an X-Z plane on the basis of the solid model of a lathe shape formed by a lathe shape forming unit (220). A first/second step working sectional shape forming unit (227) produces sheet models of the worked sectional shapes of the first step and the second step on the basis of the sheet model of the lathe sectional shape, a step dividing position and an overlap amount. A first step disused shape deleting unit (229) and a second step disused shape deleting unit (230) delete the shape needing no work, from the sheet models of the worked sectional shapes of the first step and the second step.