Manufacturing Processes: Ch18

Front 1

Which of the following are bulk deformation processes? (3)

(a) bending

(b) deep drawing

(c) extrusion

(d) forging

(e) rolling

(f) shearing

Back 1

extrusion, forging, rolling

Front 2

Which of the following is typical of the starting work geometry in sheet metal processes?

(a) high volume-to-area ratio

(b) low volume-to-area ratio

Back 2

low volume-to-area ratio

Front 3

The flow curve expresses the behavior of a metal in which of the following regions of the stress-strain curve?

(a) elastic region

(b) plastic region

Back 3

plastic region

Front 4

The average flow stress is the flow stress multiplied by which of the following factors?

(a) n

(b) b(1+n)

(c) 1/n

(d) 1/(1+n)

where n is the strain-hardening exponent

Back 4

1/(1+n)

Front 5

Hot working of metals refers to which one of the following temperatures regions relative to the melting point of the given metal on an absolute temperature scale?

(a) room temperature

(b) 0.2Tm

(c) 0.4Tm

(d) 0.6Tm

Back 5

0.6Tm

Front 6

Which of the following are advantages and characteristics of hot working relative to cold working? (4)

(a) fracture of workpart is less likely

(b) friction is reduced

(c) increased strength properties

(d) isotropic mechanical properties

(e) less overall energy is required

(f) lower deformation forces is required

(g) more significant shape changes are possible

(h) strain-rate sensitivity is reduced?

Back 6

fracture of workpart is less likely, isotropic mechanical properties, lower deformation forces is required, more significant shape changes are possible

Front 7

Increasing strain rate tends to have which one of the following effects on flow stress during hot forming of metal?

(a) decreases flow stress

(b) has no effect

(c) increases flow stress

Back 7

increases flow stress

Front 8

The coefficient of friction between the part and the tool in cold working tends to be?

(a) higher

(b) lower

(c) no difference relative to its value in hot working

Back 8

lower