Wire Electrical Discharge Machine Worktable Wear Management
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Solution Overview
Problem
The flatness and parallelism of the worktable surface in wire electrical discharge machines deteriorate quickly due to repeated contact with workpieces, leading to accuracy issues and reduced machining efficiency.
Innovation Solution
A wire electrical discharge machine equipped with a placement area detector, placement time measuring unit, and cumulative time storage system that divides the worktable surface into areas, measures placement time, and displays cumulative time to guide operators in placing workpieces on less worn areas, thereby delaying surface deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If workpieces are repeatedly placed in the same position on the worktable, then machining efficiency is improved, but the flatness and parallelism of the worktable surface deteriorate
Solution Approach 1:
The worktable surface is divided into multiple measurement areas, and wear is evaluated independently for each area. This segmentation allows operators to identify specific high-wear zones and distribute workpiece placement across different areas, thereby maintaining machining efficiency while preventing concentrated wear that would degrade overall surface accuracy.
Solution Approach 2:
The system performs preliminary measurement of the worktable surface flatness and parallelism before machining operations begin. Based on these preliminary measurements, the system identifies suitable areas for workpiece placement that will not exacerbate existing wear, thus preventing further deterioration of surface accuracy while maintaining efficient machining operations.
2Strength
If the worktable surface is made more durable through surface layers, then wear resistance is improved, but the complexity of the worktable structure increases
Solution Approach 1:
The system incorporates a measurement device that continuously monitors the flatness and parallelism of the worktable surface, providing feedback on wear conditions. This feedback mechanism allows for real-time identification of high-wear areas without requiring complex structural modifications to the worktable itself, thus achieving wear management through information-based control rather than structural complexity.
3Manufacturing precision
If the worktable surface is frequently polished to maintain accuracy, then manufacturing precision is maintained, but loss of time increases
Solution Approach 1:
The measurement device performs preliminary and periodic assessments of worktable surface accuracy, identifying areas that have reached wear thresholds before significant degradation occurs. This allows for targeted, minimal polishing operations only when and where needed, rather than frequent comprehensive polishing, thus maintaining surface accuracy while minimizing maintenance time.
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 configuration allows operators to intuitively identify and avoid high-wear areas, extending the lifespan of the worktable surface and maintaining machining accuracy by distributing wear evenly.
Implementation Method 1
generates electric discharge at an electrode gap between a wire electrode and a workpiece by applying voltage across the electrode gap to perform electrical discharge machining on the workpiece
Data Source
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AI summary
A wire electrical discharge machine (10) which performs electrical discharge machining on a workpiece (W), includes: a worktable (54) on which the workpiece (W) is placed; a placement area detector (26a) that divides the top surface of the worktable (54) into multiple areas and detects the areas where the workpiece (W) is placed; a placement time measuring unit (26b) that measures placement time for which the workpiece (W) is placed on each of the areas detected by the placement area detector (26a); and a cumulative time storage (26c) that adds up the placement times measured by the placement time measuring unit (26b) for each of the areas as a cumulative time for the area.