Numerical Control for Vibration Cutting Corner Accuracy
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Solution Overview
Problem
Existing numerical control devices fail to achieve desired machining accuracy for corners during vibration cutting, as they do not effectively manage the movement and vibration of tools to precise tolerances.
Innovation Solution
A numerical control device that includes a control computation unit capable of calculating specific points for tool movement based on tolerance values, generating vibration waveforms, and adjusting movement and vibration to ensure accurate machining of corners by combining command and vibration movement amounts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the tool executes Z-axis command immediately when X-axis vibration reaches target position, then corner machining speed is improved, but machining accuracy deteriorates
Solution Approach 1:
The system performs preliminary calculation of the specific point on the movement path that corresponds to the target corner position, considering the vibration waveform in advance. This allows the control system to prepare the corrected vibration waveform beforehand, enabling accurate corner machining without sacrificing speed.
Solution Approach 2:
The system uses feedback by calculating the actual tool position based on the vibration waveform and comparing it with the target position. The control computation unit adjusts the vibration waveform based on this feedback to ensure the tool passes through the specific point with the required precision.
2Manufacturing precision
If the tool waits for next command until reaching target position, then machining accuracy is improved, but productivity deteriorates
Solution Approach 1:
The control computation unit performs preliminary calculations to determine the specific point and generate the corrected vibration waveform before the machining operation begins. This eliminates the need for waiting during actual machining, thereby improving productivity while maintaining accuracy.
3Device complexity
If simple command movement control is used, then device complexity is reduced, but manufacturing precision deteriorates
Solution Approach 1:
The control computation unit implements a feedback mechanism that calculates the tool's actual position based on the vibration waveform and compares it with the target position. This feedback loop enables precise corner machining without requiring complex hardware modifications.
Solution Approach 2:
The system replaces complex mechanical positioning mechanisms with computational methods. The control computation unit uses software-based calculations to determine the specific point and generate corrected vibration waveforms, substituting mechanical complexity with computational intelligence.
Data Source
AI summary
A numerical control device for controlling a main shaft, which is a rotating shaft for a workpiece, a drive shaft that drives a tool for vibration cutting of the workpiece in an X-axis direction, and a drive shaft that drives the tool or the workpiece in a Z-axis direction, includes: a storage unit that stores a machining program for vibration cutting of the workpiece; and a control computation unit that calculates a specific point that the tool passes during vibration cutting on the basis of a tolerance value, which is an allowable error in machining of a corner of the workpiece, and generates a vibration waveform of the tool indicating a movement path of the tool passing the specific point, in which the control computation unit controls movement and vibration of the tool in accordance with the machining program and the vibration waveform.