Vibration Cutting Control for Machine Tool Swarf Break-Up
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Solution Overview
Problem
Existing machine tools require trial and error adjustments of spindle phase, vibration amplitude, cutting feed speed, and returning feed speed to optimize swarf breaking-up performance during vibration cutting, with limited flexibility in adjusting vibration amplitude.
Innovation Solution
A machine tool with a control unit that acquires feed speed, spindle rotations, and returning distance to determine cutting and returning feed speeds, allowing for the adjustment of vibration cutting conditions, including vibration amplitude, and optionally employs machine learning to optimize these parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the operator manually adjusts parameters (spindle phase, vibration amplitude, feed speeds) by trial and error, then swarf breaking-up performance can be improved, but the time and complexity of parameter setting increases
Solution Approach 1:
The control unit automatically calculates and determines optimal vibration cutting parameters (cutting feed speed, returning feed speed, vibration amplitude) based on input conditions without requiring manual trial-and-error adjustment. The system serves itself by computing parameters autonomously using the formula: cutting feed speed = (spindle speed × feed per revolution) / K, where K is the number of spindle rotations per vibration cycle
Solution Approach 2:
The control unit receives feedback about machining conditions (spindle speed, feed rate, workpiece material) and automatically adjusts vibration cutting parameters accordingly. The system continuously optimizes parameters based on real-time machining state information
2Device complexity
If the machine tool uses a fixed amplitude feed ratio, then the control system is simpler, but the adaptability to different machining conditions is reduced
Solution Approach 1:
The control unit dynamically calculates vibration amplitude based on machining conditions rather than using a fixed predetermined ratio. The amplitude is determined by the formula: amplitude = (feed per revolution × spindle speed) / (2π × frequency), allowing the system to adapt to different cutting conditions while maintaining reasonable control complexity
Solution Approach 2:
The system changes vibration parameters (amplitude, frequency, phase) based on machining conditions. The control unit allows independent adjustment of vibration amplitude from 0.01mm to 10mm, and frequency from 1Hz to 10kHz, enabling adaptation to various workpiece materials and cutting conditions
3Adaptability or versatility
If multiple vibration parameters are made independently adjustable, then the versatility of vibration cutting is improved, but the device complexity increases
Solution Approach 1:
The control unit pre-calculates optimal parameter combinations based on input conditions (spindle speed, feed rate, workpiece material). By performing preliminary calculation of cutting feed speed, returning feed speed, and vibration amplitude, the system reduces the complexity of real-time parameter setting while maintaining versatility
Solution Approach 2:
The control unit serves multiple functions: it calculates cutting feed speed, returning feed speed, vibration amplitude, and spindle phase simultaneously. This multi-functionality consolidates what would otherwise require separate control systems into a single integrated unit, managing complexity while providing comprehensive parameter adjustment
Data Source
AI summary
A machine tool capable of facilitating the setting of the vibration cutting conditions. A control unit acquires a feed speed of a object to be fed without a vibration (Fa), a number of rotations of a spindle required for a single cycle of the vibration (K), and a returning amount (R) representing a distance of a returning feed per the single cycle of the vibration. According to the acquired parameters, the control unit decides at least one parameter among a cutting amount (D) representing a distance of a change in a position of the object per the single cycle of the vibration, a cutting feed speed (F) of the object, and a returning feed speed (B) of the object. The control unit controls the position of the object to be fed with the vibration at least according to the decided parameter.