Numerical Controller Synchronized Oscillation for Thread Cutting
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Solution Overview
Problem
Conventional thread cutting methods struggle to efficiently shred chips due to unsynchronized oscillating motions between multiple axes, leading to inefficient chip fragmentation.
Innovation Solution
A numerical controller for machine tools that generates synchronized oscillation commands for the work rotary axis, tool feed axis, and radial direction motion axis, allowing intermittent cutting-out and cutting-in motions to create synchronized oscillating motion, effectively shredding chips along one path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional thread cutting methods are used with multiple axes, then thread grooves can be formed through coordinated motion, but chips cannot be efficiently shredded due to unsynchronized oscillating motions
Solution Approach 1:
The patent applies mechanical vibration by generating oscillation commands that cause the cutting tool to vibrate in synchronized oscillating motion along the thread groove path. This vibration is coordinated across multiple axes (X-axis for radial motion, Z-axis for feed motion, and C-axis for rotation) to effectively shred chips while maintaining precise synchronization, directly resolving the contradiction between chip shredding efficiency and motion synchronization
Solution Approach 2:
The patent implements periodic action through oscillation commands that create regular, periodic oscillating motions of the cutting tool. The oscillation follows a periodic pattern where the tool periodically departs from and returns to the workpiece along the thread groove path, enabling continuous chip shredding throughout the machining process while maintaining synchronized periodic motion across all axes
2Speed
If cutting tool moves fast in Z-axis direction, then thread groove follows steeper spiral pattern, but chip shredding becomes less effective
Solution Approach 1:
The patent overcomes the limitation of fast Z-axis movement by superimposing mechanical vibration on the cutting tool's motion. The oscillation commands generate synchronized vibrations that actively shred chips even at high feed speeds, allowing the tool to maintain steep spiral patterns while effectively fragmenting chips through vibrational action rather than relying solely on slow, intermittent cutting motions
Solution Approach 2:
The patent applies dynamics by making the cutting tool's motion dynamic through oscillation rather than static or purely translational movement. The oscillation commands create dynamic, multi-directional motion that adapts to the cutting conditions, enabling effective chip shredding at various Z-axis speeds by adjusting the oscillation characteristics to maintain chip fragmentation effectiveness
Data Source
AI summary
To provide a numerical controller for a machine tool capable of shredding chips efficiently along one path by making oscillating motion involving synchronization between multiple axes and intermittently making cutting-out motion and cutting-in motion. A controller is for a machine tool used for thread cutting of a work as a target of the thread cutting using multiple axes, comprising: a movement command generation unit that generates a movement command for the multiple axes; an oscillation command generation unit that generates an oscillation command for causing a work rotary axis, a tool feed axis, and a radial direction motion axis to make oscillating motion involving synchronization between these three axes, the oscillation command being for causing a cutting tool to make motion of departing from the work while making cutting-out motion on the work and make cutting-in motion on the work intermittently; and an adder that adds the movement command and the oscillation command and outputs a total movement command resulting from the addition.