Machine Tool Control Device for Asynchronous Oscillation Cutting
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Solution Overview
Problem
Conventional machine tools require preparing a vibration cutting information table ahead of time, which is cumbersome and time-consuming, leading to reduced production efficiency and potential workpiece damage due to chip entanglement.
Innovation Solution
A control device for machine tools that dynamically adjusts shredding conditions based on machining parameters during actual cutting operations, using a main motor, auxiliary motors, a machining command unit, an oscillation command unit, and a control unit to perform asynchronous oscillation cutting without pre-defined tables, ensuring efficient chip mincing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vibration cutting information table is prepared ahead of time, then vibration cutting can be performed according to pre-defined conditions, but the process becomes cumbersome and time-consuming, reducing production efficiency
Solution Approach 1:
The patent applies dynamics by transitioning from static pre-defined vibration cutting parameters to dynamic real-time parameter adjustment. The control device dynamically determines oscillation frequency and amplitude based on actual machining conditions (rotation speed, feed rate) during cutting operations, eliminating the need for time-consuming pre-prepared tables while ensuring optimal vibration cutting performance.
Solution Approach 2:
The system implements self-service by automatically determining appropriate vibration cutting parameters based on the machining conditions themselves. The control device uses the actual rotation speed and feed rate as inputs to autonomously calculate and apply the correct oscillation frequency and amplitude, making the system self-regulating without requiring external pre-programming or manual intervention.
2Productivity
If continuous cutting is performed without chip removal, then production efficiency is maintained, but chips entwine with the tool and can damage the workpiece
Solution Approach 1:
The patent applies mechanical vibration by superimposing oscillation commands on the auxiliary motors to create intermittent cutting conditions. The tool periodically separates from the workpiece during rotation, which naturally breaks and minces chips, preventing them from entangling with the tool while maintaining continuous production. This vibration-based approach solves the chip removal problem without stopping the machining process.
3Reliability
If oscillation command is added to machining command, then chip mincing is achieved, but the system complexity increases
Solution Approach 1:
The patent merges the oscillation command generation and addition functions into the existing machining control device. Rather than adding separate complex control systems, the invention integrates the oscillation command making unit and addition unit within the existing control architecture, combining multiple functions (parameter determination, oscillation command generation, and command integration) into a unified control system that manages complexity through consolidation.
Data Source
AI summary
A control device for a machine tool for cutting a rotationally-symmetric workpiece by a tool, includes a machining command making unit for making a machining command for an auxiliary motor based on rotation speeds of the workpiece and the tool, and feed rates of the tool and the workpiece, an oscillation command making unit for making an oscillation command for the auxiliary motor, based on the rotation speeds and the feed rates, so that the oscillation command is asynchronous with the rotation speed of the workpiece around the axis of rotation, and so that the tool intermittently cuts the workpiece, an addition unit for adding the oscillation command to the machining command, and a control unit for controlling the auxiliary motor based on the machining command to which the oscillation command has been added.