Numerical Control Device Multi-Index Evaluation for Machining Optimization
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Solution Overview
Problem
Conventional numerical control devices primarily focus on minimizing shape error as the evaluation index, neglecting other critical factors like machining time and operational shock, which are important in actual manufacturing settings.
Innovation Solution
A numerical control device that evaluates and modifies parameters based on multiple indices, including path error, machining time, and jerk, using a command position calculation unit, path error calculation unit, machining time calculation unit, and jerk calculation unit to produce an evaluation value that considers these factors, allowing for comprehensive optimization of machining operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the evaluation focuses only on minimizing path error to improve machining precision, then manufacturing precision is improved, but machining time increases and productivity decreases
Solution Approach 1:
The patent applies parameter changes by modifying the evaluation criteria from a single parameter (path error) to multiple parameters (path error, machining time, and jerk). This allows the system to find optimal parameter sets that balance machining precision with productivity, rather than simply minimizing path error which would increase machining time
Solution Approach 2:
The patent introduces additional evaluation dimensions beyond path error. By adding machining time and jerk as evaluation indices, the system transitions from a one-dimensional optimization to a multi-dimensional evaluation, enabling simultaneous consideration of precision and productivity requirements
2Manufacturing precision
If the evaluation focuses only on minimizing path error to improve machining precision, then manufacturing precision is improved, but operational stability deteriorates due to increased jerk
Solution Approach 1:
The patent modifies the evaluation parameters to include jerk as a third dimension. This allows the system to identify parameter sets that maintain machining precision while limiting operational shock and vibration, thereby improving operational stability
Solution Approach 2:
The patent implements a feedback mechanism where the evaluation results based on multiple indices are used to automatically adjust machining parameters. This closed-loop control ensures that both precision and operational stability requirements are met by continuously optimizing parameter selection
3Adaptability or versatility
If multiple evaluation indices are introduced to comprehensively evaluate machining performance, then the evaluation capability is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing an evaluation system that handles multiple indices (path error, machining time, jerk) within a unified framework. The parameter set selection unit can evaluate and optimize across all three dimensions simultaneously, providing multi-functional evaluation capability without requiring separate complex systems for each index
Data Source
AI summary
A numerical control device comprises a command position calculation section that calculates command position information based on a machining program; a command path calculation section that calculates command path information based on the command position information; an estimated actual position calculation section that calculates estimated actual position information based on the command position information and transmission characteristic information; an estimated actual path calculation section that calculates estimated actual path information based on the estimated actual position information; a path error calculation section that calculates path error based on the command path information and the estimated actual path information; a machining time calculation section that calculates a machining time based on the estimated actual path information; a jerk calculation section that calculates jerk based on the estimated actual position information; and an evaluation position calculation section that calculates evaluation values based on the path error, machining time and jerk.