Electrochemical Machining Gap Monitoring via Voltage Pulses

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Solution Overview

Problem

Existing methods for determining the actual gap dimension between an electrode and a work piece during electrochemical machining require stopping the process, which reduces efficiency by necessitating electrode manipulation for gap measurement.

Innovation Solution

Monitoring the voltage pulse across the gap and constructing an envelope based on the global minimum of successive voltage pulses to deduce the actual gap dimension in real-time, allowing continuous process operation without interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the electrode is manipulated to measure the actual gap dimension using mechanical contact, then the measurement accuracy is improved, but the electrochemical machining process is interrupted and efficiency decreases

Engineering Contradiction:

Improvegap dimension measurement accuracyVSAvoidelectrochemical machining efficiency

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The patent replaces the mechanical contact measurement system with an electrical measurement system. Instead of physically touching the workpiece with the electrode to measure the gap, the system uses voltage pulse measurements across the gap to determine its dimension. This substitution eliminates the need to stop the electrochemical machining process for measurement, as the electrical measurement can be performed without breaking the electrolyte bridge or requiring mechanical contact.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces voltage pulses as an intermediary measurement mechanism. By applying voltage pulses across the gap and measuring the resulting current or voltage characteristics, the system can infer the gap dimension without direct mechanical contact. This intermediary electrical measurement method allows continuous monitoring during the electrochemical machining process without interruption.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If the electrochemical machining process continues without interruption, then productivity is maintained, but real-time gap monitoring becomes difficult without process termination

Engineering Contradiction:

Improveelectrochemical machining efficiencyVSAvoidactual gap dimension measurement capability

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The patent enables continuous gap monitoring during the electrochemical machining process by using voltage pulse measurements that can be taken without interrupting the electrolyte flow or the electrochemical reactions. The measurement system operates concurrently with the machining process, allowing the useful action of both machining and measurement to continue simultaneously without interruption.

Inventive Principle:

Principle #20Continuity of useful action

Solution Approach 2:

The system employs periodic voltage pulse applications to continuously monitor the gap dimension. By applying voltage pulses at regular intervals during the electrochemical machining process, the system can track gap variations over time while maintaining continuous machining operation. This periodic measurement approach ensures real-time monitoring capability without requiring continuous process interruption.

Inventive Principle:

Principle #19Periodic action

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

Enables real-time monitoring and control of the gap without disrupting the electrochemical machining process, maintaining efficiency and improving process stability through Fourier analysis validation.

Implementation Method 1

performing a measurement of a value of an operational parameter characterizing the electrochemical process; deducing the actual gap dimension from said value based on an a-priori established relationship between said value and the actual gap dimension

Methodology Applied

Scientific EffectVoltage pulse measurement: Electrical Resistance

Implementation Method 2

the work piece is machined by a number of machining pulses. As a result of the machining a front surface of the work piece is dissolved in the electrolyte

Methodology Applied

Scientific EffectElectrochemical dissolution: Electrolysis

Data Source

PatentUS7727375B2Method and an arrangement to determine a running value of the gap during the electrochemical machining

Publication Date: 2010.06.01 KONINKLIJKE PHILIPS NV

AI summary

A method and an arrangement (1) for determining an actual value of the gap (4) between the work piece (2) and the electrode (3) during a process of electrochemical machining. According to the invention first process control means (30) are arranged to supply a set of machining current pulses (Im) to the electrode and the work piece. Second process control means (32) are arranged to perform a measurement of an operational parameter (U) representing a value of the gap (4) in real time under operational conditions. The second process control means (32) comprise means to determine the actual value of the gap (55a) based on the measurement of the operational parameter and logical unit (55b) to actuate the positioning means (8) to translate the electrode (3) in case the measured value of the gap deviates from the preset value of the gap.