Machine Tool Positioning With Vibration-Assisted Semi-Closed Control
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Solution Overview
Problem
Machine tools using semi-closed loop control often face inaccuracies in stop position due to internal stress in structures, leading to deviations from target positions, and adding position detection sensors increases costs.
Innovation Solution
Applying a vibration component to the movement of the drive subject between the initial and target positions during semi-closed loop control, which helps release internal stress and improve accuracy without the need for additional sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a position detection sensor is added to detect the position of the drive subject, then the accuracy of the stop position is improved, but the cost increases
Solution Approach 1:
The patent applies mechanical vibration to the drive subject during movement from the initial position to the target position. This vibration causes the drive subject to repeatedly advance toward and retreat from the target position, which releases internal stress in the guide mechanism and improves stop position accuracy without requiring additional sensors.
Solution Approach 2:
The patent changes the movement parameters of the drive subject by superimposing a vibration component on the normal movement. This creates a controlled oscillating motion pattern that allows the system to exploit stress release effects during the vibration cycles, thereby improving positioning accuracy through parameter modification rather than hardware addition.
2Device complexity
If semi-closed loop control is used to move the drive subject to the target position, then the control simplicity is maintained, but the stop position accuracy deteriorates due to internal stress
Solution Approach 1:
The control unit superimposes a vibration component on the semi-closed loop control signal, causing the drive subject to oscillate between advancing toward and retreating from the target position. This mechanical vibration releases internal stress in the guide mechanism, allowing the simple semi-closed loop control to achieve higher positioning accuracy.
Solution Approach 2:
The patent implements periodic vibration action during the movement process, where the drive subject repeatedly advances and retreats from the target position in a periodic manner. This periodic motion pattern continues until the internal stress is sufficiently released, at which point the drive subject can be accurately positioned at the target location.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the accuracy of the stop position of the drive subject while reducing the torque generated by the servo motor and minimizing cycle time, thus improving precision and reducing power consumption.
Implementation Method 1
the control unit performs the semi-closed loop control so as to apply to movement of the drive subject a vibration component with which, from a midway position between the initial position and the target position to the target position, an advancing motion toward the target position and a retreating motion opposite to the advancing motion are performed repeatedly
Data Source
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AI summary
Provided is a machine tool with which the accuracy of a stop position of a drive subject can be improved in a case where semi-closed loop control is performed. The machine tool includes a guide mechanism for guiding at least one drive subject among the tool and the workpiece, a servo motor that moves the drive subject guided by the guide mechanism, and a control unit that performs semi-closed loop control on the servo motor so as to move the drive subject from an initial position to a target position. The control unit performs the semi-closed loop control so as to apply to movement of the drive subject a vibration component with which, from a midway position between the initial position and the target position to the target position, an advancing motion toward the target position and a retreating motion opposite to the advancing motion are performed repeatedly.