ECM CHM Flashcards
What is Chemical Machining (CHM)?
CHM is a nontraditional process where material is removed through controlled chemical dissolution using acidic or alkaline etchants.
CHM is often used for creating complex geometries and can be applied to various materials.
What is Electrochemical Machining (ECM)?
ECM removes material through a combination of electrical and chemical phenomena, using a cathode, an anode, and an electrolyte.
ECM is particularly effective for hard materials and complex shapes.
What is the main difference between CHM and ECM?
CHM relies solely on chemical reactions, while ECM uses both electrical and chemical processes for material removal.
Name one advantage of ECM.
ECM does not produce thermal or mechanical stress on the workpiece, ensuring a high-quality surface finish.
Name one disadvantage of ECM.
The process consumes high specific energy and is limited to electrically conductive materials.
What are common materials used as electrodes in ECM?
Copper, graphite, brass, and copper-tungsten due to their machinability, conductivity, and corrosion resistance.
What safety concern is associated with ECM?
Hydrogen gas is released during machining, posing an explosion risk.
What is a typical application of ECM?
ECM is used for machining intricate shapes like turbine blades and deburring hard-to-reach areas.
What are the main functions of the electrolyte in ECM?
The electrolyte facilitates anodic dissolution, removes heat, and carries away reaction by-products.
What is a significant environmental concern of CHM?
CHM generates hazardous chemical waste that requires proper disposal.
