Wire EDM Path Compensation for Thick-Thin Step Accuracy
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Solution Overview
Problem
Wire electrical discharge machining faces accuracy issues and flaw generation around steps in workpieces due to abrupt changes in removal amounts when machining thick to thin portions, leading to disconnection of the wire electrode and streak-like flaws on the workpiece surface.
Innovation Solution
A wire electrical discharge machine and machining program editor that include a path determination unit and path compensator to adjust the machining path by forming protrusions in the thin portion, compensating the path to maintain a consistent removal amount per unit time, thereby avoiding sudden changes in removal rates across the boundary line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the machining condition is automatically changed at the position of steps to handle thickness changes, then the adaptability to different workpiece geometries is improved, but the manufacturing precision deteriorates due to abrupt changes in removal amount causing streak-like flaws
Solution Approach 1:
The machining path is compensated in advance by adding protrusions at thin portions before machining occurs. This preliminary path adjustment prevents abrupt removal amount changes during machining, thereby avoiding streak-like flaws while maintaining adaptability to step positions.
Solution Approach 2:
The machining path is locally modified by adding protrusions only at specific thin portions where steps occur, rather than uniformly changing the entire path. This localized compensation maintains machining accuracy at critical areas while preserving overall adaptability.
2Manufacturing precision
If the machining path is compensated by forming protrusions in thin portions, then the manufacturing precision is improved by maintaining consistent removal rates, but the device complexity increases due to path determination and compensation mechanisms
Solution Approach 1:
The system automatically determines and compensates the machining path without requiring external intervention or complex manual programming. The path determination unit and path compensator work autonomously to detect thin portions and adjust the path, simplifying operator tasks while maintaining precision.
3Productivity
If the wire electrode moves along a linear path crossing the boundary between thick and thin portions, then the productivity is improved by direct machining, but the reliability deteriorates due to wire electrode disconnection at the step
Solution Approach 1:
The machining path is pre-adjusted by adding protrusions at thin portions before machining begins. This preliminary compensation ensures that the wire electrode maintains consistent contact with the workpiece throughout machining, preventing disconnection while preserving productivity through automated path adjustment.
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 solution effectively suppresses the generation of flaws around steps in the workpiece by maintaining consistent removal rates, ensuring accurate machining and preventing wire electrode disconnection, thus improving the overall machining accuracy.
Implementation Method 1
A wire electrical discharge machine performs electrical discharge machining on a workpiece by generating discharge sparks between a wire electrode and the workpiece
Data Source
AI summary
A machining program editor that edits a machining program in which a machining path for a wire electrode of a wire electrical discharge machine is set, the machining program editor including: a path determination unit configured to determine whether or not the machining path includes a linear path section that crosses a boundary line between a thick portion of a workpiece and a thin portion of the workpiece, a thickness of the thin portion being smaller than a thickness of the thick portion in an extending direction of the wire electrode; and a path compensator configured to compensate the machining path so as to form, in the thin portion over a predetermined distance, a protrusion projecting outward from the boundary line when the path determination unit determines that the linear path section is included.