Machine Tool Movement Control Arc Locus Interference Avoidance
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Solution Overview
Problem
Conventional machine tool movement control methods are inefficient in tool switching operations, leading to prolonged moving times and potential interference with other parts, as they either fail to prevent interference or require stopping rapid traverse movements, resulting in increased moving times and space requirements.
Innovation Solution
A movement control apparatus that uses rapid traverse on intersecting axes, sets a reference arc, and adjusts the overlap movement start timing to allow the moving member to move around a given area without interference, utilizing a drive unit, reference arc setting unit, and timing setting unit to control the movement, ensuring the moving member avoids other parts by drawing an approximate arc locus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the tool post is moved sequentially along X and Y axes with stopping at intermediate positions to avoid interference, then interference with other parts is prevented, but the moving time is prolonged
Solution Approach 1:
The patent calculates and determines the overlap movement start timing in advance based on the reference arc and rapid traverse parameters. By pre-calculating when the second axis movement should start relative to the first axis movement, the system eliminates the need for stopping at intermediate positions while ensuring the tool post follows a safe arc-shaped path that avoids interference with other parts.
Solution Approach 2:
The patent introduces a reference arc (curved path) for the tool post movement instead of straight-line sequential movement along X and Y axes. The tool post follows this arc-shaped locus during overlap movement, which naturally avoids interference zones while enabling continuous motion. The curvature of the reference arc is specifically designed to clear obstacles while minimizing movement time.
2Loss of time
If rapid traverse movements in two directions are overlapped without stopping, then moving time is shortened, but interference with other parts may occur
Solution Approach 1:
The patent pre-calculates the overlap movement start timing based on the reference arc geometry and rapid traverse parameters before execution. This preliminary calculation ensures that when the second axis movement starts during the first axis movement, the tool post remains on a safe arc-shaped path that avoids interference, eliminating the need for conservative stopping while maintaining safety.
Solution Approach 2:
The system uses the pre-calculated reference arc as a feedback guide for the overlap movement. The arc represents the safe movement boundary, and by timing the second axis start based on this reference, the system ensures continuous rapid traverse movement stays within safe boundaries without requiring real-time stopping or correction.
3Reliability
If the tool post is positioned at intermediate positions to switch moving direction, then interference is avoided, but the moving route becomes longer
Solution Approach 1:
The patent replaces the sequential straight-line movement with an arc-shaped reference path. Instead of moving along X axis then Y axis with intermediate positioning, the tool post follows a curved arc locus that directly connects start and end points while clearing obstacles. This curved path is geometrically optimized to be shorter than the L-shaped sequential path while maintaining interference avoidance.
Solution Approach 2:
The reference arc is pre-calculated to represent the optimal safe path before movement execution. By determining this arc in advance based on the workspace geometry and obstacle positions, the system identifies the shortest safe curved trajectory, eliminating the need for longer sequential paths with intermediate stopping positions.
Data Source
AI summary
A movement control apparatus for a moving member, includes: a drive unit that moves a moving member by rapid traverse on a first axis and a second axis intersecting the first axis, and overlaps the rapid traverse movements in the two axis directions to thereby allow the moving member to move around the periphery of a given area; a reference arc setting unit that sets a reference arc inscribed in the first and second axes; a timing setting unit that sets an overlap movement start timing for the rapid traverse of the moving member based on the reference arc when switching the moving member from the first axis to the second axis; and a control unit that controls the operation of the drive unit to move the moving member at a timing set by the timing setting unit.