Machine Tool Servo Start-Up Vibration for Guide Friction Reduction
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Solution Overview
Problem
Machine tools experience high loads on their drive systems when starting to move a workpiece due to friction issues caused by oil film shortages in guide mechanisms, leading to potential system deterioration.
Innovation Solution
Applying controlled vibration to the drive subject before movement to spread lubricating oil over guide surfaces, reducing initial friction and torque requirements, thereby minimizing the load on the drive system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the drive subject is stopped for a period, then the guide mechanism can maintain its position, but oil film shortage occurs on the guide surface causing increased friction and load on the drive system
Solution Approach 1:
The patent applies mechanical vibration to the drive subject before movement to prevent oil film shortage on the guide surface. The vibration causes the lubricating oil to spread uniformly across the guide surface, maintaining the oil film even after the drive subject stops, thereby reducing friction and the load on the drive system when movement resumes.
2Force
If vibration is applied to spread lubricating oil, then friction is reduced and load on drive system decreases, but additional control complexity is introduced
Solution Approach 1:
The patent applies vibration in advance before the drive subject moves, specifically during the period when the drive subject is stationary or just before movement begins. This preliminary action ensures the lubricating oil is spread on the guide surface before contact occurs, reducing friction without requiring continuous vibration during operation, thus minimizing control complexity.
3Speed
If the servo motor generates large torque to overcome static friction, then the drive subject can start moving, but the drive system experiences high load and may deteriorate
Solution Approach 1:
The patent uses mechanical vibration to reduce static friction between the guide surfaces before the drive subject starts moving. By spreading the lubricating oil uniformly across the guide surface through vibration, the static friction is significantly reduced, allowing the servo motor to generate smaller torque to initiate movement, thereby reducing load on the drive system and improving its durability.
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
The controlled vibration reduces the load on the drive system when starting to move the workpiece, suppressing system deterioration and improving operational efficiency.
Implementation Method 1
the guide surface sticks, and therefore the servo motor generates large torque in order to start moving the drive subject
Implementation Method 2
lubricating oil is supplied to the guide surface of the guide mechanism and so on
Data Source
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AI summary
Provided is a machine tool with which a load acting on a drive system for driving a drive subject when the drive subject starts to move toward a target position can be reduced. The machine tool includes a guide mechanism for guiding at least one drive subject from among a tool and a workpiece, a servo motor that moves the drive subject guided by the guide mechanism, and a control unit that controls the servo motor so as to move the drive subject from an initial position to the target position. The control unit controls the servo motor so as to apply vibration in which an advancing motion toward the target position and a retreating motion opposite to the advancing motion are performed repeatedly to the drive subject for a set period up to a point at which the drive subject starts to move toward the target position from the initial position.