Turning Tool Direction Control for Chatter-Resistant Machining
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Solution Overview
Problem
Machine tools face challenges in reducing chatter vibrations during turning operations, particularly in inner diameter turning where long extension portions of the turning tool increase the likelihood of such vibrations, and existing solutions may require reinforcing the machine's structure to handle reaction forces.
Innovation Solution
The machine tool incorporates a workpiece spindle and a tool holding device that allows for rotation about a tool rotation axis, with a movement mechanism and control circuitry to adjust the cutting direction based on a specified target angle, reducing chatter vibrations by optimizing the cutting path and tool position in three-dimensional coordinates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the turning tool has a long extension portion for inner diameter turning, then the tool can reach the inner diameter of the workpiece, but chatter vibrations increase
Solution Approach 1:
The tool holding device is made rotatable about a tool rotation axis, allowing dynamic adjustment of the cutting direction. The control circuitry rotates the tool to a target cutting direction that reduces chatter vibrations during inner diameter turning operations, transforming a static tool configuration into a dynamically adjustable system.
Solution Approach 2:
The system changes the cutting direction parameter by rotating the tool holding device to a specific target angle. This parameter change optimizes the cutting path to minimize chatter vibrations while maintaining the necessary extension length for inner diameter access.
2Stability of the object's composition
If the machine tool structure is reinforced to handle reaction forces, then machining stability improves, but device complexity and cost increase
Solution Approach 1:
Instead of reinforcing the machine structure, the system changes the cutting direction parameter by rotating the tool. This parameter adjustment reduces chatter vibrations and improves machining stability without requiring additional structural reinforcement or increased device complexity.
Solution Approach 2:
The patent replaces mechanical structural reinforcement with a control-based solution. Rather than adding rigid structural elements to handle reaction forces, the system uses rotational control of the tool to optimize cutting dynamics and reduce vibrations, substituting mechanical strength with intelligent control.
3Device complexity
If the cutting direction is fixed in the basic direction, then the machining program is simple, but chatter vibrations cannot be reduced through direction optimization
Solution Approach 1:
The system introduces dynamic cutting direction control by rotating the tool holding device to a target cutting direction specified in the machining program. This allows the cutting direction to be optimized for each operation to reduce chatter vibrations, transforming a fixed-direction system into a dynamically adaptable one.
Data Source
AI summary
A machine tool includes a workpiece spindle being rotatable about a rotation axis of the workpiece and configured to hold a workpiece such that the workpiece. A tool holding device is rotatable about a tool rotation axis and configured to hold a turning tool via which turning is performed on the workpiece. A movement mechanism is configured to move the tool holding device such that the turning tool rotates relatively to the workpiece toward an arbitrary direction perpendicular to the rotation axis of the workpiece. Control circuitry is configured to execute a machining program, to perform the turning, which includes an additional code which designates a target cutting direction of the arbitrary cutting direction, and to control the movement mechanism to move the turning tool in the target cutting direction with respect to the workpiece while the control circuitry executes the additional code.