Machine Tool Control Device for Smooth Chip Segmentation
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Solution Overview
Problem
Conventional machine tools are limited in their ability to execute reciprocal vibration based on user-defined conditions of rotations and vibrations, leading to suboptimal cutting performance and potential tool wear due to uneven load distribution.
Innovation Solution
A control device that adjusts the number of rotations, number of vibrations, and vibration frequency to match user-set parameters, incorporating a correcting unit to ensure smooth machining by segmenting chips and controlling vibration amplitude, thereby optimizing cutting tool movement and reducing tool wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the control device executes operating instructions in a predetermined period, then the control system operates stably, but the vibration frequency is limited to specific values that cannot meet user-defined machining conditions
Solution Approach 1:
The patent applies dynamics by making the instruction period variable rather than fixed. The control device dynamically adjusts the instruction period based on the relationship between vibration frequency and rotation speed, allowing the system to adapt to different machining conditions while maintaining stable control operation. This resolves the contradiction by enabling both control stability and frequency adaptability through dynamic parameter adjustment.
Solution Approach 2:
The patent changes the parameter of instruction period from a fixed predetermined value to a variable parameter that can be adjusted according to machining requirements. By calculating the appropriate instruction period based on vibration frequency and rotation speed relationships, the system can achieve user-defined vibration conditions while maintaining reliable control execution.
2Reliability
If the vibration frequency is limited to specific values, then the control device operates reliably within its execution period, but the reciprocal vibration cannot be executed under user-defined rotation and vibration conditions
Solution Approach 1:
The system dynamically calculates and adjusts the instruction period based on the user-defined rotation speed and desired vibration frequency. This allows the control device to execute reliable control operations while accommodating flexible user-defined machining conditions, resolving the contradiction between control reliability and operational flexibility.
Solution Approach 2:
The control device uses feedback by continuously monitoring the relationship between vibration frequency, rotation speed, and instruction period. It adjusts the instruction period based on the calculated requirements to ensure both reliable control execution and adherence to user-defined machining parameters.
3Device complexity
If the control device uses a fixed instruction period, then the system structure remains simple, but the number of rotations and vibration frequency cannot be independently optimized for smooth cutting and chip segmentation
Solution Approach 1:
The patent implements dynamics by making the instruction period a dynamic parameter that adjusts based on machining requirements. This allows independent optimization of rotation speed and vibration frequency for smooth cutting and proper chip segmentation, while adding minimal complexity to the control structure through calculated parameter adjustment.
Data Source
AI summary
To provide a machine tool and a control device for the machine tool that can smoothly cut a workpiece while segmenting chips by feeding a cutting tool in a feed direction while reciprocally vibrating the cutting tool along the feed direction on the basis of a condition set by a user. The machine tool (100) or the control device (C) includes: a setting unit (C1, C2) for utilizing a number of rotations of relative rotation of a workpiece (W) and the cutting tool, a number of reciprocal vibrations of the cutting tool per rotation of the relative rotation, and a vibration frequency dependent on a period in which the control device (C) can execute an operating instruction when the workpiece W is machined as parameters and for setting values of two of the parameters to a control section (C1); and a correcting unit (C1) for setting the remaining one of the parameters to a predetermined value and correcting the values of the two of the parameters set by the setting unit on the basis of the value of the remaining one of the parameters.