EDM Work Tank Lift Controller for Fluid Level Stability
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Solution Overview
Problem
Existing electrical discharge machines face operativity issues due to the linkage between the partitioning plate and electrode guide movement, which affects fluid level adjustment and interferes with preparatory work, and there is a risk of machining fluid immersion and instability during machining.
Innovation Solution
A processing tank raising/lowering device with a lift controller that adjusts the processing tank height based on the electrode guide position, ensuring the machining fluid surface is at a predetermined height during machining and allowing for easy preparatory work by invalidating this function during non-machining operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the partitioning plate is mechanically linked with the W-axis slide to adjust fluid level in linkage with electrode guide raising/lowering, then the fluid level can be automatically adjusted during machining, but the operativity deteriorates during preparatory work when electrode guide remains at raised position
Solution Approach 1:
The system dynamically changes the control mode of the processing tank lift based on operational phase. During machining, the lift controller activates elevation coordinating function to maintain fluid level stability. During preparatory work, the function is deactivated to allow independent electrode guide positioning. This dynamic switching resolves the contradiction by adapting system behavior to current operational requirements.
Solution Approach 2:
The control system changes the operational parameter of the lift controller between two states: coordinated mode during machining and independent mode during preparatory work. This parameter change allows the system to optimize performance for each specific operational phase, maintaining fluid level stability when needed while preserving operational flexibility when required.
2Reliability
If the processing tank height is continuously adjusted to maintain fluid level over electrode guide, then machining stability is improved, but the complexity of the control system increases
Solution Approach 1:
The lift controller incorporates feedback from the position detector that monitors electrode guide position. This feedback mechanism allows the system to automatically adjust processing tank height to maintain the fluid level at the predetermined distance above the electrode guide, ensuring machining stability without requiring complex manual intervention or overly sophisticated control algorithms.
Data Source
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AI summary
In order to solve the problem of reduced operability due to a work tank getting in the way when raising or lowering a partitioning plate, in this electrical discharge machine, the top end of a vertically extending electrode (10) is supported by an electrode holder (7) so as to be able to be raised and lowered, the circumferential surface of the bottom end of said electrode (10) is supported by an electrode guide (8) that is disposed so as to be able to move vertically with respect to the electrode holder (7), and the position of said electrode guide (8) is detected by a position detection unit (32). This electrical discharge machine is provided with a work-tank raising/lowering device. During electrical discharge machining, said work-tank raising/lowering device raises/lowers a work tank (17), in accordance with the electrode-guide position (Hg) detected by the position detection unit (32), so as to set the distance from a prescribed part of the work tank (17) to the electrode-guide position (Hg) equal to a prescribed value (Ha). When electrical discharge machining is not being performed, the functionality whereby the work tank (17) is raised/lowered in accordance with the electrode-guide position (Hg) is disabled.