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Industrial Mechanic 2nd Block, Harmonized > Methods of Assembly > Flashcards

Methods of Assembly Flashcards

1
Q

The method of assembling parts is determined by: (3)

A
  • interference,
  • equipment available,
  • size of parts being assembled
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2
Q

when one part is pressed onto another, this is called:

A

Forced fitting

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3
Q

when the hub is heated/expanded to be assembled upon the shaft, this is called:

A

shrink fitting

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4
Q

when the shaft is cooled/shrunk to allow parts to be assembled upon it, this is called:

A

expansion fitting

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5
Q

This is the most accurate method of assembly of parts with an interference fit:

A

forced fitting

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6
Q

When performing a forced fitting, what two types of presses could you use? (2)

A
  • Hydraulic press

- Arbor press

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7
Q

What two styles of hydraulic press are there? (2)

A
  • Free standing hydraulic press

- Portable hydraulic press

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8
Q

As with all fits, the contacting surfaces must be free from:

A

Grit

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9
Q

it is most important that the axis of the internal and external parts stay in line with each other during a forced fitting. If either part is canted, one or both parts:

A

May be damaged

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10
Q

tests have shown that smooth mating surfaces free from lubricant give the best grip, however:

A

anti seize applied before assembly helps reduce seizure and abrasion

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11
Q

to shrink fit parts, the outer part is heated, causing it to expand. What could you use as a heat source? (6)

A
  • Hot water, oil baths
  • steam
  • oxy/gas hand torches
  • oil/gas/electric furnaces
  • electronic resistance heating
  • electronic induction heating
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12
Q

Allowances for a shrink fit are usually determined by consulting:

A

the working drawing or suitable tables

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13
Q

The required temperature change depends upon the total expansion required and on the:

A

coefficient of linear expansion of the metal

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14
Q

instead of heating a hub, the shaft may be:

A

contracted by cooling

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15
Q

when expansion fitting (freeze fitting), what methods can be used to cool the shaft? (4)

A
  • Industrial refrigerator
  • liquid air
  • alcohol and dry ice
  • liquid nitrogen
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16
Q

This method of cooling gives easy control of temperature and can reach temperatures of around -50C (-58F)

A

Industrial refrigerator

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17
Q

This method of cooling is able to reach temperatures as low as -120C (-184F)

A

Liquid air

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18
Q

This method of cooling is similar to liquid air, but a lot safer due to the absence of oxygen

A

Liquid Nitrogen

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19
Q

This method of cooling is done without expensive equipment. It can produce temperatures of -50C to -60C (-58F to -76F).

A

Alcohol and dry ice

Note: This method causes frost formation on parts, which could be a problem

20
Q

Hydraulic presses are classified by: (3)

A
  • Type
  • Force output
  • function
21
Q

Hydraulic presses are rated according to their:

A

Pushing capacity in tons

22
Q

Mechanical arbor presses are used for ____ jobs

A

light

23
Q

an advantage of an arbor press is that it gives the user:

A

a sense of the amount of pressure being applied

24
Q

A free standing hydraulic press consists of a frame of substantial construction with devices for holding work pieces, a ram for pushing, and is actuated by:

A

a pump

25
Q

a _____ should be attached to all powered presses.

A

safety cage

26
Q

by controlling the hydraulic fluid flow with a directional control valve, the cylinder may be:

A

extended, retracted, stopped

27
Q

a press that’s fitted with a ram instead of a cylinder is has:

A

springs that retract the ram when the control valve is released

28
Q

Powered presses are fitted with adjustable directional control valves to set max working pressure. This valve also operates as a:

A

Safety release when pressure becomes too high

29
Q

the workpiece and work holding devices are supported by a slide rack called a:

A

platen

Note: The platen is supported by safety pins which must withstand the max pressure from the cylinder

30
Q

to adjust the position of the platen, some presses are fitted with lift cables. When pressing, always ensure:

A

tension is relieved from the cables.

31
Q

This type of press consists of a hand pump with a reservoir connected by a high pressure hydraulic hose to a detachable cylinder:

A

portable hydraulic press aka porta-power

32
Q

pullers are available in various styles, shape and size. Manual pullers are used for light jobs. For heavier jobs, pullers can be used with a:

A

portable hydraulic press

33
Q

what are the three basic situations where a particular style of puller is used: (3)

A
  • Pulling a component off a shaft
  • Pulling a component out of a hole
  • Pulling a shaft out of a component
34
Q

the most basic styles of pullers are the: (2)

A
  • two leg and three leg jaw pullers
  • rod puller

Note: any style can be used manually or with a portable hydraulic press

35
Q

the legs of a two or three leg puller can also be called:

A

grip arms

36
Q

With a two or three leg jaw puller, what can you replace the adjustable screw with? (besides a portable hydraulic press)

A

slide hammer

37
Q

With rod pullers, this is often used to grip or support the work being pulled:

A

bearing splitter attachment

38
Q

a bearing splitter is used to:

A

removing anti friction bearings and other components

39
Q

shaft protectors are designed to:

A

protect the shaft center hole and end of puller screw from distortion

40
Q

What is used to bridge a hole when removing bearings, gears, or other hollow parts on hollow shaft or housing?

A

step plate adapters

41
Q

determine the puller type to use by identifying: (4)

A
  • How the part can be gripped,
  • Reach
  • Spread
  • Force required
42
Q

Regarding pullers, this is based on the length of the part or the distance the part may need to be pulled:

A

reach

43
Q

regarding pullers, this is the opening needed to grip the part(usually the width of the part):

A

spread

44
Q

Regarding strength and force, the rule of thumb for selecting a manual puller is the adjusting screw should be at least:

A

half as large as the shaft

45
Q

Regarding strength and force, and hydraulic applications, the rule of thumb for selecting a puller is: select a puller that will withstand a force exerted in tons-

A

7-10 times the diameter of the shaft in inches

46
Q

when using pullers, ____ cannot be stressed enough

A

safety

Industrial Mechanic 2nd Block, Harmonized (28 decks)

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