Numerical Control Display for Machining Error Diagnosis
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Solution Overview
Problem
Conventional numerical control devices lack effective methods to identify and diagnose errors in machining processes, as they primarily compare shapes between command and actual trajectories after interpolation, making it difficult to determine the cause of errors in the machining program or parameter settings.
Innovation Solution
A numerical control device with a display part that compares program coordinates before interpolation, command coordinates after interpolation, and actual coordinates, allowing operators to visually assess changes and determine error sources by displaying program and command trajectories alongside actual trajectories, along with distance calculations between selected points on these trajectories.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional evaluation methods compare errors in shapes between command trajectory and actual trajectory after interpolation, then the evaluation can be performed, but it is difficult to identify the cause of errors from interpolation or machining program
Solution Approach 1:
The patent segments the trajectory evaluation into multiple distinct components: program trajectory (before interpolation), command trajectory (after interpolation), and actual trajectory. By displaying these separately and providing selective comparison options, the system enables precise identification of where errors occur in the control chain, resolving the difficulty of error cause identification while maintaining evaluation precision.
2Ease of operation
If the display part shows only the comparison between command trajectory and actual trajectory, then the display is simple, but the operator cannot determine whether errors result from interpolation or machining program
Solution Approach 1:
The display system is designed to be dynamic and flexible, allowing the operator to select which trajectories to compare based on the specific evaluation needs. The system can display program trajectory, command trajectory, actual trajectory, or any combination thereof, adapting to different diagnostic scenarios without requiring a fixed complex display structure.
Solution Approach 2:
The patent adds a new dimension to the display by introducing the program trajectory as a reference layer alongside the traditional command and actual trajectories. This creates a multi-layered comparison framework that enables operators to trace errors back to their source (program, interpolation, or execution) without significantly increasing the operational complexity.
Data Source
AI summary
A numerical control device according to the present invention includes a display part for displaying a program coordinate and a command coordinate such that they can be compared with each other. The display part may be adapted to further display an actual coordinate. The display part may also be adapted to further display a program trajectory, a command trajectory and an actual trajectory, which are obtained from a machining program and the program coordinate, the command coordinate and the actual coordinate, respectively.