Scraper Force-Displacement Control for Catch-Free Machining
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Solution Overview
Problem
Conventional machining devices for scraping workpieces lack the ability to detect when the scraper tool becomes caught, leading to excessive local scraping and reduced productivity due to reliance solely on reaction force feedback.
Innovation Solution
A machining device equipped with a drive unit, position detection unit, machining force detection unit, and a control unit that adjusts the scraper's displacement and height based on detected correlations to maintain optimal scraping conditions, preventing excessive cutting or missing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If only reaction force is used as feedback signal for controlling the scraper tool, then the control system is simple, but the scraper tool cannot detect when it becomes caught on the work surface leading to excessive local scraping
Solution Approach 1:
The patent combines multiple detection methods (camera-based convex portion detection and force sensor-based reaction force detection) into a unified control system. The camera detects the positions of convex portions on the work surface, while the force sensor monitors machining forces, and both inputs are integrated to control the scraper tool's operations, thereby improving detection reliability without excessive complexity increase
Solution Approach 2:
The patent implements a feedback control mechanism where the control unit continuously receives information from both the camera (convex portion positions) and force sensor (machining forces), processes this feedback information, and adjusts the scraper tool's displacement and machining parameters in real-time to prevent catch situations and excessive scraping
2Productivity
If the scraper tool continues machining when caught on the work surface, then the machining process is continuous, but the work surface is locally scraped excessively reducing productivity
Solution Approach 1:
The patent dynamically adjusts the scraper tool's displacement speed and machining parameters based on real-time feedback from the force sensor and camera. When the system detects a catch situation through abnormal force patterns or convex portion positions, it automatically modifies the machining dynamics by reducing speed or adjusting displacement, thereby maintaining both productivity and surface scraping accuracy
Solution Approach 2:
The camera detects convex portions on the work surface in advance before the scraper tool reaches them. This preliminary detection allows the control system to prepare appropriate machining parameters and displacement rates before actual cutting occurs, preventing catch situations and excessive scraping while maintaining continuous productive machining
Data Source
AI summary
A machining device for scraping a workpiece is provided. The machining device includes: a drive unit for driving a scraper; a first detection unit for detecting the position of the scraper; a second detection unit for detecting the machining force of the scraper with respect to the workpiece; a first acquisition unit for acquiring information relating to displacement of the scraper; a second acquisition unit for acquiring information relating to the machining force of the scraper; and a control unit for driving the drive unit based on the information relating to the displacement of the scraper by the first acquisition unit and the information relating to the machining force of the scraper acquired by the second acquisition unit, so the displacement and the machining force of the scraper satisfy a prescribed relationship. A control device and a control method for the machining device are also provided.