Working Device Force Control via Characteristic Change Detection
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Solution Overview
Problem
Existing motor-actuated working devices require predetermined force or pressure thresholds for operation, leading to unnecessary force application and potential quality loss in tasks like crimping, cutting, and stamping, as they terminate operations based on absolute values rather than characteristic changes in device values.
Innovation Solution
The method evaluates characteristic changes in device values such as motor current or hydraulic pressure to determine the completion of a specific working force, allowing for timely termination before reaching a general working force, thus avoiding unnecessary force application and maintaining operation quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a predetermined force threshold is used to terminate working operations, then the operation can be completed, but unnecessary force application occurs leading to quality loss
Solution Approach 1:
The system continuously monitors device values (motor current, hydraulic pressure) during operation and uses this feedback to detect characteristic changes that indicate completion of the working force requirement. This real-time feedback mechanism allows termination at the precise moment when the certain working force is attained, preventing unnecessary additional force application that would degrade operation quality.
Solution Approach 2:
The invention transitions from using fixed absolute force thresholds to monitoring characteristic changes in device parameters (motor current, hydraulic pressure). By detecting changes in the rate of change or pattern of these parameters, the system can identify when the certain working force has been attained, enabling precise termination timing that maintains manufacturing precision while minimizing excessive force application.
2Reliability
If a general working force exceeding the certain working force is applied, then the operation terminates reliably, but quality loss occurs due to excessive force
Solution Approach 1:
The continuous monitoring and evaluation of device values provides reliable detection of the characteristic change indicating certain working force attainment. This feedback-based termination criterion ensures reliable operation completion while precisely stopping at the correct moment, eliminating the need to overshoot to a general working force that would compromise quality.
Solution Approach 2:
The system prepares termination criteria based on characteristic changes in device values before operation begins. By having predetermined the nature of the characteristic change that signals completion, the system can reliably detect and respond to it during operation, ensuring both reliable termination and prevention of excessive force application.
3Adaptability or versatility
If absolute force thresholds are used for termination, then the control system is simple, but it cannot adapt to varying certain working force requirements
Solution Approach 1:
The feedback-based detection of characteristic changes in device values provides adaptability to varying certain working force requirements. Instead of requiring multiple fixed thresholds for different operations, the system adapts to each operation's specific requirements by detecting the characteristic change pattern unique to that operation's completion condition, maintaining control system simplicity while achieving versatility.
Solution Approach 2:
By monitoring characteristic changes in device parameters rather than using fixed absolute thresholds, the system inherently adapts to varying working force requirements. The characteristic change detection method works across different operations and force levels without requiring complex reconfiguration, achieving adaptability with minimal increase in device complexity.
Data Source
AI summary
A device and method for operating a motor-actuated working device is provided. A certain working operation requires a rise in an applied force to a certain working force. The device enables a rise in the force to a general working force that exceeds the certain working force and an apparatus is provided for monitoring the device value. For the certain working operation, an evaluation is performed to detect the characteristic change and that the attainment of the characteristic change is used as a signal for ending the certain working operation after the certain working force has been attained but before the general working force has been attained.