NC Interference Checking With Reused Orientation Data
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Solution Overview
Problem
Conventional numerical controllers face challenges in completing interference check computations within a control period due to the time required for determining interference between multiple machine elements, which can lead to undetected interference if not all sets are checked in time.
Innovation Solution
A numerical control system that includes an attitude dependency information storage unit, an interference check unit, and an update unit to store and update attitude dependency information based on shape and attitude, allowing reuse of this information when attitudes do not change, thereby reducing the need for recalculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If interference check computation is performed on all check target sets using conventional methods, then interference detection accuracy is improved, but computation time increases and may exceed control period
Solution Approach 1:
The patent pre-calculates and stores attitude dependency information (separation axes and separation planes) for all check target sets before the control period begins. This preliminary computation allows the interference check to be performed rapidly during the control period by simply comparing current positions against the pre-computed geometric relationships, without recalculating separation axes and planes for each check target set.
Solution Approach 2:
The patent pre-calculates and stores attitude dependency information (separation axes and separation planes) for all check target sets before the control period begins. This preliminary computation allows the interference check to be performed rapidly during the control period by simply comparing current positions against the pre-computed geometric relationships, without recalculating separation axes and planes for each check target set.
2Reliability
If interference check computation is performed on multiple check target sets, then comprehensive interference detection is improved, but computation time increases beyond control period
Solution Approach 1:
The patent pre-calculates and stores attitude dependency information (separation axes and separation planes) for all check target sets before the control period begins. This preliminary computation allows the interference check to be performed rapidly during the control period by simply comparing current positions against the pre-computed geometric relationships, without recalculating separation axes and planes for each check target set.
Solution Approach 2:
The patent divides the interference check computation into two segments: (1) pre-computation of attitude dependency information (separation axes and planes) for all check target sets, and (2) rapid position-based interference determination during the control period. This segmentation allows comprehensive checking of multiple target sets while maintaining real-time performance.
3Measurement precision
If attitude dependency information is recalculated for each interference check, then accuracy is maintained, but computation time increases
Solution Approach 1:
The patent pre-calculates and stores attitude dependency information (separation axes and separation planes) for all check target sets before the control period begins. This preliminary computation allows the interference check to be performed rapidly during the control period by simply comparing current positions against the pre-computed geometric relationships, without recalculating separation axes and planes for each check target set.
Solution Approach 2:
The patent changes the computational approach from recalculating geometric parameters (separation axes and planes) at each control period to using pre-computed parameters with simple position comparisons. This parameter change maintains accuracy while dramatically reducing computation time during real-time operation.
Data Source
AI summary
According to the present invention, a numerical control device 3 moves a plurality of machine elements of a machine tool 2 along a plurality of control axes on the basis of a moving pulse and performs an interference check calculation between two machine elements forming a prescribed set to be checked. The numerical control device 3 comprises: an orientation dependence information storage unit 53 which stores orientation dependence information that depends on shape and orientation and does not depend on the position of each of the two machine elements forming the set to be checked; an interference check unit 36 which performs an interference check calculation on the basis of pieces of position information and the pieces of the orientation dependence information about the machine elements; and an orientation dependence information update unit 52 which acquires pieces of shape information and pieces of orientation information about the machine elements, and updates the pieces of orientation dependence information on the basis of the pieces of shape information and the pieces of orientation information, wherein the orientation dependence information update unit 52 does not update the pieces of orientation dependence information, when the pieces of orientation information do not change.