Machine Tool Correction Value Calculation for Rotational Axes
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Solution Overview
Problem
Existing methods for correcting geometric errors in machine tools with translational and rotational axes often cause infinitesimal movements in non-operated translational axes, leading to inaccuracies in machining processes like flattening and drilling, resulting in surface irregularities and reduced tool life.
Innovation Solution
A method and program that calculate correction values for rotational axes to correct tool position and posture errors without affecting translational axes, ensuring accurate machining by isolating correction operations to rotational axes only.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If correction values are calculated using existing methods that consider geometric errors in translational axes, then tool position accuracy is improved, but infinitesimal movements occur in non-operated translational axes causing surface irregularities and reduced machining accuracy
Solution Approach 1:
The correction method is segmented into two distinct parts: (1) correction values for rotational axes that are calculated and applied, and (2) correction values for translational axes that are explicitly set to zero and not applied. This segmentation allows the patent to correct tool position errors through rotational axis corrections only, preventing the harmful infinitesimal movements in translational axes while maintaining measurement precision.
Solution Approach 2:
The patent extracts and isolates the rotational axis correction component from the total correction process. By calculating correction values specifically for rotational axes (A-axis, C-axis, etc.) based on geometric errors, and deliberately excluding translational axis corrections, the method removes the harmful effect of infinitesimal translational movements while preserving the beneficial correction of tool position errors.
2Reliability
If correction commands are issued to translational axes during rotational axis operation, then geometric error correction is achieved, but tool life is reduced due to abnormal drilling conditions and stop feed occurrences
Solution Approach 1:
The correction approach is segmented to apply corrections only to rotational axes while explicitly excluding translational axes. This segmentation ensures that geometric error correction is achieved through rotational axis adjustments alone, preventing the issuance of correction commands to translational axes that would cause stop feed occurrences and reduce tool life.
Solution Approach 2:
The patent extracts the rotational axis correction functionality from the comprehensive correction system and isolates it from translational axis corrections. By doing so, the method maintains geometric error correction reliability while eliminating the harmful effects on tool life that result from translational axis correction commands during drilling operations.
Data Source
AI summary
The present invention provides a method and the like that are capable of calculating a correction value for a rotational axis and make it possible to correct an error in position or position and posture of a tool, which results from a geometric error, correct an error in posture of the tool, and also enhance the accuracy in machining by preventing a translational axis from operating in an infinitesimal manner due to a correction command. In a machine tool having two or more translational axes and one or more rotational axes, a correction value for each of the translational axes is calculated using a command position of each of the rotational axes, a coordinate value of a correction reference point as one point designated in advance in a command position space of each of the translational axes, and a geometric parameter representing the geometrical error.