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Question 3 a) In an Electrochemical Machining process, the feedstock is made of an aluminium alloy (Ultimate...

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Mechanical Engineering

Question 3

a) In an Electrochemical Machining process, the feedstock ismade of an aluminium alloy (Ultimate Tensile Strength = 572 MPa,Tensile Yield Strength = 503 MPa). The desired time to machine ahole (?=10 mm) through a 20 mm-thick part is 2.1 min at a feed rateof 0.18 mm/s. What are:

(i) the efficiency of the process in %, and

(ii) the current requirement in amps to achieve this machiningtime target?

b) Describe in detail the process of circular sawing with theaid of a freehand sketch. What are the two major mechanisms bywhich circular sawing is achieved and what materials are commonlyused as circular saws of each type?

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