Geometric Accuracy Improvement by Using Electrochemical Reaming with a Helical Tube Electrode as Post-Processing for...

Area of Science:

• Manufacturing Engineering
• Electrochemistry
• Fluid Dynamics

Background:

• Electrical discharge machining (EDM) often requires post-processing to achieve high-precision hole characteristics.
• Improving the accuracy and surface quality of EDM-generated holes is crucial for various industrial applications.

Purpose of the Study:

• To investigate electrochemical reaming with a helical tube electrode as an advanced post-processing technique for EDM.
• To enhance the machining accuracy and surface quality of holes produced by EDM.

Main Methods:

• Flow field simulations were employed to compare velocity distributions between cylindrical and helical tube electrodes.
• Comparative experiments were conducted to evaluate exit circularity error, taper, and surface morphology.
• Process parameter optimization experiments were performed to determine optimal machining conditions.

Main Results:

• Helical tube electrodes demonstrated superior flushing capabilities compared to cylindrical ones, promoting better removal of machining debris.
• Electrochemical reaming significantly improved hole accuracy, reducing exit circularity error and taper.
• Surface morphology analysis confirmed a notable enhancement in surface quality after electrochemical reaming.

Conclusions:

• Electrochemical reaming using a helical tube electrode is an effective post-processing method for EDM.
• The helical structure and lateral flushing optimize debris removal, leading to improved dimensional accuracy and surface finish.
• Optimized machining parameters further enhance the performance of this electrochemical reaming technique.