Machine Tool Vibration Control for Precise Return Feed Positioning
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Solution Overview
Problem
In vibration cutting, it is challenging to accurately control the return movement of the cutting tool to a predetermined position, making it difficult to perform cutting with the desired amount of feed.
Innovation Solution
A control device for a machine tool that includes a return position calculation means, a forward feed setting means, and a return movement setting means, which together enable precise control of the cutting tool's movement by calculating return positions and setting pulse-like signals to ensure the cutting tool reaches predetermined positions during forward and return movements, with the option to set the phase of the inflection point differently from the change point to optimize cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the cutting tool performs reciprocal movement with return movement in counter-machining direction, then the cutting tool can be fed with vibration, but it is not easy to control the return movement to a predetermined position corresponding to predetermined amount of feed
Solution Approach 1:
The control device calculates the return position in advance based on the relationship between the amount of feed and the number of vibrations. By determining the target return position before executing the reciprocal movement, the system can accurately control the cutting tool to reach the predetermined position corresponding to the predetermined amount of feed, thereby resolving the positioning accuracy issue while maintaining vibration cutting capability
Solution Approach 2:
The control device uses feedback control to monitor the actual position of the cutting tool during reciprocal movement and adjusts the movement to ensure the cutting tool reaches the calculated return position. This feedback mechanism enables precise control of the return movement while maintaining the vibration cutting process
2Object-generated harmful factors
If the cutting tool vibrates during cutting, then chip segmentation is improved, but the control complexity increases due to need to coordinate forward feed and return movement
Solution Approach 1:
The control device merges the control of forward feed movement and return movement into a single integrated control system. By combining these movements under unified control that automatically calculates coordinates based on the relationship between amount of feed and number of vibrations, the system achieves effective chip segmentation while reducing the perceived control complexity
Solution Approach 2:
The control device performs multiple functions including calculating return positions, generating pulse-like signals for reciprocal movement, and coordinating forward feed and return movements. This multi-functional control system handles both the vibration generation and position control in a single device, reducing overall system complexity
Data Source
AI summary
A control device for a machine tool comprises a control section controlling the relative rotation and feeding of a cutting tool and a material, performing cutting with vibration of the cutting tool relative to the material by combining a forward feed movement in the machining direction, and a return movement in the counter-machining direction. A return movement setting section sets a pulse-like signal including a command for moving a cutting tool in the machining direction and a command for the return movement. A forward feed setting section makes the cutting tool reach a change point by combining the movement in the machining direction on the basis of the return movement setting section and the forward feed movement. A pulse-like signal is formed in sine waveform with an inflection point, and a phase of the inflection point is set to a value different from a phase of the change point.