Robot Control Device for Automated Screw-Tightening Torque
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Solution Overview
Problem
Existing robot systems lack efficient methods for setting and reflecting screw-tightening torque and speed in screw-tightening processes, requiring labor and time to configure these parameters manually.
Innovation Solution
A control device with a processor that receives characteristics of the screw and objects involved, calculates and displays recommended screw-tightening torque and speed, and controls the robot's screwdriver to accurately perform screw-tightening tasks, including impedance control to prevent damage and ensure proper alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manual setting of screw-tightening torque and speed is performed, then control precision is maintained, but labor and time consumption increase
Solution Approach 1:
The system performs self-service by automatically calculating and setting screw-tightening torque and speed based on screw characteristics (diameter, pitch, material, strength class) that are automatically detected or selected. The control device computes optimal parameters using embedded algorithms, eliminating the need for manual configuration while maintaining precision.
Solution Approach 2:
The invention changes parameters automatically by computing screw-tightening torque and speed based on screw characteristics. The system varies torque values and rotation speeds according to the specific screw type being used, enabling adaptive parameter setting without manual intervention for each screw variant.
2Loss of time
If automatic parameter calculation is implemented, then setting time is reduced, but calculation accuracy may be compromised
Solution Approach 1:
The system incorporates feedback mechanisms where the control device receives actual screw-tightening results and torque sensor data, then adjusts calculation algorithms to improve accuracy. The feedback loop allows the system to learn from actual performance and refine automatic parameter calculations for better precision over time.
Solution Approach 2:
The invention performs preliminary action by pre-calculating and storing optimal torque and speed parameters for various screw types in a database. When a screw is used, the system retrieves pre-computed parameters based on screw characteristics, ensuring accurate settings are established before the tightening operation begins.
3Object-affected harmful factors
If impedance control is applied, then damage to screw and object is prevented, but control system complexity increases
Solution Approach 1:
The invention uses torque sensors as intermediaries to detect actual tightening forces and provide feedback to the control device. This intermediary measurement system enables impedance control by allowing the controller to adjust motor output based on real-time torque feedback, preventing over-tightening and damage while maintaining manageable system complexity.
4Measurement precision
If multiple screw characteristics are considered, then torque setting accuracy is improved, but data processing complexity increases
Solution Approach 1:
The control device performs multi-functionality by integrating multiple functions into a single system: detecting screw characteristics (diameter, pitch, material, strength class), calculating optimal torque and speed parameters, controlling the screwdriver motor, and monitoring actual tightening forces. This universal controller handles all data processing tasks, improving torque setting accuracy through comprehensive parameter consideration while consolidating complexity into one device.
Data Source
AI summary
A control device includes a processor that is configured to execute computer-executable instructions so as to control driving of a robot capable of performing work including a screw-tightening process for tightening a screw, wherein the processor is configured to: receive an input of at least one of characteristics of an object including the screw used in the screw-tightening process; calculate, on the basis of the characteristics received, a value concerning screw-tightening torque at a time of the tightening of the screw by the robot; and cause a display to display the value concerning the screw-tightening torque.