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Note on chemical machining

Subject : Production Process 2

Difficulty : Medium


renu • 434  views
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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.

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