Tool Deflection Compensation for Curved-Path Machining Accuracy
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Solution Overview
Problem
High-precision machining is hindered by tool deflection during machining processes, especially in circumferential machining of workpieces with external and internal radii, leading to inaccuracies due to existing compensation methods being ineffective for non-straight portions.
Innovation Solution
A method that compensates tool deflection by adjusting the relative speed and tool path based on the ratio of tool radius to workpiece radius of curvature and engagement lengths, using specific correction formulas to account for straight, external, and internal radii, allowing for precise machining through a control unit in machine tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the tool path is corrected by the dimension of deflection in the direction of the workpiece, then compensation is simple to implement, but the compensation leads to imprecise machining results on workpieces with non-straight portions
Solution Approach 1:
The patent segments the workpiece geometry into different types (straight portions, external radii, internal radii) and applies appropriate compensation methods to each segment. The control unit automatically identifies and classifies different geometric features, then applies the suitable compensation strategy for each segment. This segmentation approach maintains reasonable system complexity while significantly improving precision on curved portions.
Solution Approach 2:
The system changes key parameters such as tool path coordinates, feed rate, and engagement depth based on the local geometry. For non-straight portions, the control unit calculates adjusted parameters that account for the curvature and tool deflection characteristics. These parameter changes enable precise machining of curved surfaces without requiring overly complex hardware modifications.
Data Source
AI summary
The invention relates to a method for compensating deflection of a tool during machining of a workpiece using a machine tool, wherein a control unit of the machine tool balances the compensation of the deflection differently in straight portions (41) and in curved portions depending on a dimension E of engagement conditions in a contact point between the tool and the workpiece, a) on the basis of a ratio of a tool radius R1 and a radius of curvature R2 of the workpiece according to the formula E=R1/R2 and/or b) on the basis of a ratio of a current engagement length L of the tool in the circumferential direction on the workpiece and an engagement length LG of the tool in the circumferential direction on the workpiece during machining of a straight portion of the workpiece according to the formula E=L/LG.