Numerical Control for Vibration Cutting Under Shaft Superimposition
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Solution Overview
Problem
Existing numerical control devices fail to perform vibration cutting when superimposition control is used, as they cannot coordinate vibration and superimposition effectively between drive shafts.
Innovation Solution
A numerical control device that controls the movement of multiple drive shafts to superimpose the movement of one shaft on another, adjusting vibration rates and rotation speeds to maintain constant vibration frequencies, allowing vibration cutting to be executed during superimposition control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If superimposition control is implemented to control multiple drive shafts, then the ability to perform complex machining operations is improved, but vibration cutting cannot be performed due to failure to achieve coordination between vibration and superimposition
Solution Approach 1:
The patent changes the control parameters by dynamically adjusting at least one of the first vibration rate, second vibration rate, or main shaft rotation speed based on vibration commands and rotation speed commands. This parameter adjustment enables the system to maintain constant vibration rates for both drive shafts while performing superimposition control, thereby achieving both complex machining operations and reliable vibration cutting coordination
2Productivity
If vibration cutting is performed with a vibrating tool, then machining efficiency is improved, but existing numerical control devices fail to coordinate vibration and superimposition control
Solution Approach 1:
The patent implements feedback control by continuously monitoring the vibration rates and rotation speed, and dynamically adjusting the control parameters based on the vibration commands and main shaft rotation speed command. The control computation unit calculates adjusted vibration rates and rotation speeds to maintain constant vibration rates for both drive shafts, enabling efficient vibration cutting while managing control coordination complexity through closed-loop feedback
Data Source
AI summary
A numerical control device for a machine tool, the machine tool including: a reference shaft that moves a tool or a workpiece; and a superimposition shaft that moves a tool or the workpiece. The numerical control device superimposes the movement amount of the reference shaft on the movement amount of the superimposition shaft. The numerical control device including a control computation unit that, in response to a superimposition control command, changes at least one of a first vibration rate, a second vibration rate, and a main shaft rotation speed on a basis of a first vibration command, a second vibration command and a main shaft rotation speed command such that the first vibration rate stays constant and the second vibration rate stays constant. The first vibration rate is a number of times that of the reference shaft vibrates per rotation of a main shaft.