written 4.9 years ago by |
Fig. stages of chemical machining process
• Etching metal can be removed from work piece by using controlled chemical
• Metal can be removed from entire surface or from selected surface.
• If selective surface machining is required, the left unmachined portion should be covered with resistant material called ‘mask ant’
Construction and working:
• In CM process, material removal takes place from the workpiece by controlled dissolution.
• Acids react with metals and form compounds by chemical reaction, these compounds are soluble in water. The chemical reagents called etchant.
• Before CM , the workpiece must be free from dust, oil and foreign particles.
• The cleaning should be done by alkaline solution
• After cleaning mask ant is applied over the surface which is not to be machined. The removed material is converted into metallic salt by chemical reaction.
Advantages:
1) Component produced is purr free
2) Tooling cost is very low.
3) Hard and brittle materials can be machined.