Semi-Closed Loop Machine Tool Positioning With Approach Vibration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing machine tools using semi-closed loop control often face accuracy issues with the stop position of drive subjects due to internal stress in the structures, without the ability to add position detection sensors to improve accuracy.
Innovation Solution
The machine tool incorporates a control unit that performs semi-closed loop control by applying a vibration component to the movement of the drive subject from a midway position to the target position, allowing for repeated advancing and retreating motions to release internal stress.
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 midway position to the target position. The vibration causes repeated advancing and retreating motions that release internal stress in the structure, enabling the drive subject to stop more accurately at the target position without requiring additional position detection sensors.
Solution Approach 2:
The patent changes the movement parameters by superimposing a vibration component on the drive subject's motion. This parameter change transforms the conventional smooth movement into a vibratory movement pattern, which releases internal stress and improves stop position accuracy while maintaining the existing sensor configuration.
2Device complexity
If semi-closed loop control is used to control the servo motor, then the device complexity is reduced, but the accuracy of the stop position deteriorates due to internal stress
Solution Approach 1:
The patent introduces mechanical vibration as a supplementary control mechanism within the semi-closed loop system. The vibration component is applied specifically during the approach to the target position, releasing internal stress that would otherwise cause positioning errors, thereby improving accuracy without changing the fundamental semi-closed loop control architecture.
Solution Approach 2:
The patent implements periodic vibration action during the movement phase from midway position to target position. This periodic advancing and retreating motion creates stress-release cycles that eliminate internal stress accumulation, allowing the semi-closed loop control to achieve higher positioning accuracy while maintaining its simplicity.
3Productivity
If the drive subject moves directly to the target position without vibration, then the productivity is high, but the accuracy of the stop position deteriorates
Solution Approach 1:
The patent applies mechanical vibration only during the critical approach phase from the midway position to the target position, rather than throughout the entire movement. This localized vibration application releases internal stress to improve accuracy while minimizing the impact on overall movement time and maintaining productivity.
Solution Approach 2:
The patent applies the vibration treatment locally to the specific phase of movement where internal stress affects positioning accuracy (from midway position to target position). The rest of the movement path maintains conventional direct motion, thus preserving productivity while achieving high accuracy at the critical stopping point.
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 without increasing costs by reducing internal stress and minimizing torque generated by the servo motor when the drive subject stops.
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
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.