WEDM Crane Deformation Compensation via Strain Feedback
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Solution Overview
Problem
Conventional wire electrical discharge machines (WEDM) face accuracy issues due to deformation of wire guides caused by high-pressure flushing fluid, leading to cutting path errors that cannot be compensated in real-time, affecting machining precision.
Innovation Solution
A WEDM with a movable crane equipped with strain gauges for deformation measurement and a control unit that uses a lookup table to perform feedback displacement control, aligning the machining heads and maintaining cutting accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-pressure flushing fluid is used to remove materials, then material removal efficiency is improved, but wire guide deformation increases causing cutting path errors
Solution Approach 1:
The patent employs strain gauges mounted on the wire guide to detect deformation in real-time during machining. The control system receives strain gauge signals, calculates the machining head displacement based on the strain-deformation relationship, and dynamically adjusts the cutting path to compensate for the deformation. This closed-loop feedback mechanism allows the system to maintain cutting path accuracy despite the high-pressure flushing fluid causing wire guide deformation.
2Measurement precision
If strain gauges are mounted on the crane for deformation measurement, then deformation detection precision is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical deformation measurement systems with electrical strain gauge sensors. Instead of using mechanical dial indicators or laser measurement systems, the invention uses strain gauges that convert mechanical deformation directly into electrical signals. These signals are processed by the control system to calculate displacement and compensate for deformation, significantly simplifying the overall system structure while maintaining high measurement precision.
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 enables real-time compensation of cutting path errors, enhancing machining precision by correcting for crane deformations caused by flushing pressure, ensuring the wire electrode cuts along the intended path.
Implementation Method 1
a measure unit, mounted on the crane for measuring the deformation of the same
Implementation Method 2
the control unit is able to perform a feedback displacement control on the crane with respect to its deformation
Implementation Method 3
WEDM is usually performed in a bath of a working fluid exerting directly on the upper and the lower wire guides at about 20 kg/cm2 for flushing materials away
Data Source
AI summary
A wire electrical discharge machine (WEDM) is disclosed, which comprises: a movable crane; a measure unit, mounted on the crane for measuring the deformation of the same; and a control unit, electrically connected to the measure unit and used for controlling the crane to move; wherein a lookup table describing the relation between the crane's deformation and position error is stored in the control unit, basing on which the control unit is able to perform a feedback displacement control on the crane with respect to its deformation.