MCE311_HW06_sol_fall2011

# MCE311_HW06_sol_fall2011 - 24.4 For the following...

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24.4 For the following application, identify one or more nontraditional machining processes that might be used, and present arguments to support your selection. Assume that either the part geometry or the work material (or both) preclude the use of conventional machining. The application is a blind-hole in the shape of the letter G in a 50 mm cube of steel. The overall size of the "G" is 25 by 19 mm, the depth of the hole is 3.8 mm and its width is 3 mm. Solution : Application: the letter “G” drilled to a depth of 3.8 mm in block of steel. Possible processes: ECM and EDM would be useful for pocketing operations such as this. 24.8 In an electrochemical machining operation, the frontal working area of the electrode is 15.6 cm 2 . The applied current = 1500 amps, and the voltage = 12 volts. The material being cut is pure aluminum, whose specific removal rate is given in Table 24.1. (a) If the ECM process is 90 percent efficient, determine the rate of metal removal in mm 3 /hr. (b) If the resistivity of the electrolyte = 15.5 ohm-cm

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MCE311_HW06_sol_fall2011 - 24.4 For the following...

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