Wire EDM Retainer Control for Stable Multi-Plate Cutting
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Solution Overview
Problem
Existing wire electrical discharge machining (WEDM) methods require reinforcement of the stage mechanism and complex control systems due to the weight of retainer plates and the need for continuous load application, leading to instability and inefficiency in cutting multiple plate-shaped members from a workpiece.
Innovation Solution
A WEDM apparatus with parallel cutting wire portions, a machining fluid flow path restriction unit, and a control unit that adjusts the position of the workpiece retainer to simplify control and reduce the need for stage reinforcement, allowing for stable machining without continuous retainer plate movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a weight part is used to press and support the workpiece, then the workpiece flutter is prevented, but the stage mechanism requires reinforcement and the weight increases
Solution Approach 1:
The patent uses a spring mechanism to provide upward elastic force that counteracts the downward pressure needed to stabilize the workpiece. The spring acts as a counterbalancing element, reducing the weight burden on the stage while maintaining sufficient pressing force to prevent workpiece flutter during machining.
Solution Approach 2:
The patent transitions from a static weight-based pressing system to a dynamic spring-based system. The spring can dynamically adjust its force according to the workpiece position and machining conditions, providing stable support without requiring heavy reinforcement of the stage mechanism.
2Ease of operation
If a drive device is used to move the retainer plate continuously, then interference with wire electrodes is prevented, but the control becomes complicated
Solution Approach 1:
The patent uses periodic reciprocating motion of the retainer plate instead of continuous movement. The retainer plate moves forward periodically to advance the workpiece and then returns to its initial position, creating a rhythmic cycle that prevents wire electrode interference while simplifying control compared to continuous positioning systems.
Solution Approach 2:
Instead of continuously moving the retainer plate forward, the system inverts the approach by having the retainer plate reciprocate - moving forward only when needed to advance workpiece layers and returning to initial position. This inversion of continuous motion to intermittent reciprocating motion reduces control complexity.
3Stability of the object's composition
If the retainer plate holds the workpiece from start to end of machining, then workpiece stability is maintained, but the control system becomes more complex
Solution Approach 1:
The retainer plate operates periodically rather than continuously, holding the workpiece stable only during critical machining phases when stability is most needed. Between these periodic holding actions, the retainer plate returns to its initial position, allowing for workpiece advancement while reducing control complexity compared to continuous holding.
Solution Approach 2:
The retainer plate is positioned and configured in advance to provide stability when needed, rather than requiring continuous active control. The preliminary positioning of the retainer plate ensures workpiece stability is automatically maintained during machining operations without complex real-time control adjustments.
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
The solution eliminates the need for stage mechanism reinforcement and simplifies control, ensuring stable and efficient cutting of multiple plate-shaped members by maintaining the workpiece retainer in an initial position until a predetermined cutting position is reached, reducing vibration and debris accumulation.
Implementation Method 1
a power feeding unit to generate electrical discharges between the cutting wire portions and the workpiece
Implementation Method 2
a pair of nozzles including two or more ejection orifices through which the cutting wire portions are inserted, to supply a machining fluid to gaps between the cutting wire portions and the workpiece
Data Source
AI summary
A control unit controls a holding device so that a cutting feed stage is driven when cutting is started to move upward a workpiece fixing plate on which a workpiece is placed and fixed and a pair of machining fluid flow straightening plates relative to a pair of machining fluid escape prevention plates so as to bring the workpiece fixing plate and the pair of machining fluid flow straightening plates closer to a plurality of cutting wire portions, and a workpiece retainer is held in an initial cutting position until the workpiece reaches a first position by the upward movement, and controls the holding device to release the hold of the workpiece retainer after the workpiece reaches the first position.