Threading Vibration Control for Chip Separation and Surface Protection
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Solution Overview
Problem
Conventional machine tools face challenges in performing threading work while effectively separating chips, which can entangle with the workpiece or cutting tool, potentially damaging the machined surface.
Innovation Solution
A method utilizing a machine tool with workpiece holding, tool rest, feeding, vibration, and rotating means to perform threading by relative movement and reciprocal vibration, where the vibration pattern is set to ensure that each cut portion partially includes a portion from a previous cut, allowing for efficient chip separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If threading work is performed by conventional machine tools with continuous cutting, then productivity is improved, but chips become long and entangle with the workpiece or cutting tool causing surface damage
Solution Approach 1:
The patent applies mechanical vibration to the cutting tool or workpiece during threading operations. The vibration superimposes periodic motion on the conventional continuous cutting path, causing the cutting tool to periodically disengage from the workpiece. This breaks continuous chips into smaller segments that can be easily evacuated, eliminating chip entanglement and surface damage while maintaining continuous cutting productivity.
Solution Approach 2:
The patent implements periodic action by introducing intermittent cutting through vibration. The cutting process alternates between cutting phases (when tool and workpiece are in contact) and non-cutting phases (when vibration causes separation). This periodic engagement breaks chip continuity without significantly reducing overall material removal rate, thus maintaining productivity while preventing chip entanglement.
2Object-generated harmful factors
If reciprocal vibration is applied during threading, then chip separation is improved, but device complexity increases due to additional vibration control systems
Solution Approach 1:
The patent makes the existing cutting tool or workpiece holder serve dual functions: both conventional cutting and vibration generation. By integrating vibration generation capability into existing components rather than adding separate dedicated vibration devices, the system achieves chip separation functionality without proportionally increasing device complexity.
Solution Approach 2:
The patent introduces a vibration intermediary element (such as a piezoelectric actuator, electromagnetic shaker, or ultrasonic transducer) that converts electrical energy into mechanical vibration. This intermediary component mediates between the control system and the cutting process, enabling precise vibration control with relatively simple device architecture compared to mechanical vibration generation systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach prevents long chip entanglement and surface damage by ensuring chip separation during threading, improving the machining process.
Implementation Method 1
vibration means to reciprocally vibrate the workpiece holding means and the tool rest in a relative manner in a radial direction of the workpiece
Data Source
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AI summary
To provide a machine tool that is capable of preventing a long, continuous chip from getting entangled with a workpiece or a cutting tool when a threading work is performed on the workpiece, and a control device of the machine tool. A machine tool (100) is capable of performing a threading work by relatively feeding a workpiece (W) and a cutting tool (130) in a feeding direction while relatively rotating the workpiece (W) and the cutting tool (130) and by performing a cutting work for multiple times in a helical manner while reciprocally vibrating the workpiece (W) and the cutting tool (130) in a relative manner in a radial direction of the workpiece (W), and the machine tool (100) or a control device (C) of the machine tool (100) includes vibration setting means (C1) to set a pattern of vibration during each cutting work accompanied by the reciprocal vibration so that a cut portion of one cutting work partially includes a portion that has been cut in another cutting work.