Machine Tool Vibration Cutting Control for Precise Return Positioning
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Solution Overview
Problem
In vibration cutting, it is challenging to accurately perform cutting with vibration when the cutting tool returns to a predetermined position corresponding to a specific feed amount, as existing techniques lack effective control mechanisms.
Innovation Solution
A control device for a machine tool that includes a feeding mechanism and a control system for managing the rotation and operation of the cutting tool, featuring a return position calculation mechanism, forward feed setting mechanism, and return movement setting mechanism to ensure precise vibration cutting by outputting pulse-like signals for the return movement, allowing the cutting tool to reach calculated positions during each vibration cycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the cutting tool performs reciprocal movement with vibration cutting, then chip segmentation is improved, but it becomes difficult to accurately return the cutting tool to the predetermined position corresponding to the predetermined feed amount
Solution Approach 1:
The return position is calculated in advance based on the relationship between feed amount and number of vibrations. The control device determines the target return position before the cutting operation begins, using the formula: return position = initial position + (feed amount / number of vibrations). This preliminary calculation ensures that the cutting tool can accurately return to the predetermined position corresponding to the predetermined feed amount, resolving the position accuracy issue while maintaining vibration cutting effectiveness.
Solution Approach 2:
The control device incorporates feedback mechanisms to monitor the actual position of the cutting tool during reciprocal movement and adjust the return position accordingly. By comparing the calculated return position with the actual position sensor data, the system can compensate for deviations and ensure accurate positioning, thereby maintaining both chip segmentation quality and return position precision.
2Ease of operation
If automatic control of vibration cutting is implemented, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The control device is designed to perform multiple functions: calculating return positions, determining pulse signal parameters, controlling reciprocal movement, and monitoring cutting conditions. By integrating these functions into a single multi-functional control system, the device achieves automatic vibration cutting control without requiring separate dedicated components for each function, thereby reducing overall system complexity while improving ease of operation.
Solution Approach 2:
The control device automatically determines vibration parameters and return positions based on pre-programmed relationships between feed amount and number of vibrations. The system self-adjusts the pulse signal frequency and duration without requiring manual intervention, and automatically compensates for position deviations using feedback from position sensors. This self-service capability simplifies operation while the automation is achieved through efficient use of existing control components.
Data Source
AI summary
A control device for a machine tool and a machine tool capable of easily performing cutting with vibration according to the amount of feed is provided. A control device (180) for a machine tool comprises a control means (181) for controlling the relative rotation and feeding of a cutting tool and a material, the control means performing control such that cutting is performed with vibrating the cutting tool relative to the material by combining a forward feed movement in the machining direction, in which the cutting tool machines the material, and a return movement in the counter-machining direction. A return position calculation section (191) for calculating a return position of the cutting tool at time when one vibration is completed on the basis of the number of vibrations and an amount of feed that are predetermined for one rotation of the cutting tool or the material, a forward feed setting section (192) for setting the forward feed movement on the basis of one or more change point setting values that determine a change point from the machining direction to the counter-machining direction, and making the cutting tool reach the determined change point, and a return movement setting means (193) for setting a pulse-like signal that is output as a command for the return movement so that the cutting tool reaches the calculated return position at time when one vibration is completed are included.