Question

In: Mechanical Engineering

1. The material removal rate of EDM process increases with (select all that apply): a.Decrease in...

1. The material removal rate of EDM process increases with (select all that apply):

a.Decrease in the melting temperature of the workpiece material, T_m

b.Increase in the discharge current, I

c.Voltage

d.Increase in the melting temperature of the workpiece material, T_m

e.Decrease in the discharge current, I

2. The volume between teeth in saws and broaches is called:

a.Relief

b.Kerf

c.Pitch

d.Gullet

3. Final dimensions of machined features are not the same as dimensions of the tool (or mask) in the following process/processes (select all that apply):

a. Electrical discharge machining (EDM)

b.Photochemical machining (PCM)

c.Electrochemical machining (ECM)

4. What is called a tooth set in saws?
a.The shape of the cutting teeth (their profile).

b.Orientation of the blade (teeth): vertical, horizontal, angled.

c.The way the insert teeth are seated and fixed in the blade.

d.The way in which the teeth are offset from the centerline in order to make the cut be wider than the thickness of the back of the saw blade (or gage)

5.What must be taken into account when using electrochemical machining for parts that need good dynamic strength and fatigue resistance? Select all choices that apply.

a.Chemicals may etch material around grain boundaries at a higher rate. These small cracks represent stress concentrators so additional treatment is needed to remove them, or special care should be taken to avoid grain boundary attack during ECM.

b.There are no negative aspects of ECM on fatigue strength.

c.Splatters that occur at edges.

d.Absence of residual stresses. Subsequent treatment is needed to introduce compressive residual stresses.

6. When using push broaches, one should pay attention to what?

a.velocity at the end of the cut

b. chipping

c. nothing special compared to broaches

d. buckling

e. alignment

7. Which machining operations are capable of making rectangular-shaped keyseats in hubs (holes)?

a. Boring

b.Broaching

c.Turning

d.Shaping

e.Milling

8. In general, nontraditional machining (NTM) technologies have these advantages over traditional machining (select all that apply):

a. Materials that are otherwise difficult to machine do not represent special difficulty for NTM processes.

b.Dimensional accuracy of machined parts is better.

c. Surface finish of machined features is better.

d. It is possible to drill holes with extremely small diameter and very high depth-to-diameter aspect ratio.

e. Residual stresses are smaller or absent.

9. What is used to degrease the pull (or push) force in broaches and/or help easier chip breaking? Select all that apply.

a. Progressive teeth design for flat broaches

b.Push/pull force cannot be reduced in broaches

c.Notched teeth

d.None of the above

e.Rotor or jump teeth

Expert Solution

samet mamat answered 2 years ago

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