Polishing Pressure Feedback Control With Detection Shaft Compensation
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Solution Overview
Problem
Current automatic polishing equipment fails to accurately control and compensate pressure between the grinding wheel and workpiece, leading to inconsistent machining quality and inefficiency due to reliance on motor current feedback, which is not a direct reflection of pressure and is affected by grinding wheel characteristics.
Innovation Solution
A method using a detection shaft to measure pressure or moment between the polishing wheel and workpiece, with a controller comparing this to a preset value and adjusting an adjustment shaft to maintain consistent pressure through continuous feedback loops, ensuring stable and accurate machining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If motor current feedback is used to control pressure between grinding wheel and workpiece, then automatic control is achieved, but pressure control accuracy deteriorates because current is not a direct reflection of pressure and is affected by grinding wheel characteristics
Solution Approach 1:
The patent introduces a detection shaft as an intermediary component that directly measures the pressure between the grinding wheel and workpiece. This detection shaft acts as a mediator between the grinding system and control system, providing accurate pressure feedback without being influenced by motor characteristics or grinding wheel variations.
Solution Approach 2:
The patent replaces the electrical measurement method (motor current feedback) with a direct mechanical measurement method (detection shaft). This substitution eliminates the indirect and inaccurate electrical measurement approach in favor of a direct mechanical pressure detection mechanism.
2Device complexity
If motor current is used as the control variable, then control system simplicity is maintained, but manufacturing precision deteriorates due to correlation with grinding wheel characteristics and frequency converter adjustments
Solution Approach 1:
The detection shaft serves as a dedicated intermediary component that directly measures pressure, providing accurate feedback signals to the control system. This intermediary structure enables precise pressure control without significantly increasing overall system complexity.
Solution Approach 2:
The patent implements a closed-loop feedback system where the detection shaft continuously monitors pressure and feeds this information back to the controller. This feedback mechanism enables automatic adjustment to maintain constant pressure, directly improving machining accuracy.
3Duration of action of moving object
If frequency converter adjusts motor speed to maintain rotation, then motor continues operating, but pressure control becomes inaccurate because current changes due to frequency adjustments rather than pressure changes
Solution Approach 1:
The patent replaces electrical current measurement with direct mechanical pressure measurement using the detection shaft. This substitution ensures that pressure detection is independent of motor speed changes and frequency converter adjustments, maintaining accuracy throughout continuous operation.
Solution Approach 2:
The detection shaft acts as an independent intermediary that directly measures pressure without being influenced by motor operations or frequency changes. This intermediary measurement system provides accurate pressure data regardless of motor speed variations.
Data Source
AI summary
The invention relates to a method for detecting, controlling and automatically compensating pressure in a polishing process, including: detecting a pressure between a polishing wheel and a polished workpiece by a detection shaft or a moment generated on the detection shaft, and outputting the detected pressure or moment to a controller; comparing the detected pressure or moment with a preset pressure or moment and determining whether there is a difference between them; calculating a compensation feeding amount based on the difference and outputting an adjustment signal to an adjustment shaft based on the compensation feeding amount; and moving the adjustment shaft correspondingly based on the adjustment signal so as to drive the polishing wheel or the polished workpiece to move correspondingly to adjust a relative position between the polishing wheel and the polished workpiece so that the difference keeps consistent.