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Kemble > 7.8 Riveting > Flashcards

7.8 Riveting Flashcards

1
Q

What is the most common countersunk angle

A

100 degrees

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2
Q

What are different rivet sizes available in

A

1/16 increments

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3
Q

What is the most common material for a rivet

A

Aluminium alloy

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4
Q

What is likewise for 2017D and 2024DD rivets

A

They need to be heat treated before use

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5
Q

What are the two phases of heat treating

A

Heating and soaking
Quenching

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6
Q

How long should the action of taking the rivet out of the oven and into the quench take

A

No more than 15 seconds

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7
Q

What must you do with a heat treated rivet to prevent its natural age hardening process if not uses straight away

A

Freeze them

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8
Q

At -18 degree C how long can you keep the rivets in a freezer for

A

7 days

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9
Q

At -20 degree C how long can you keep the rivets in a freezer for

A

20 days

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10
Q

How many heat treatment cycles are allowed in the same rivet

A

No more than 2

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11
Q

Need to get m6 rivet AD DD etc

A
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12
Q

What is a rivet pitch

A

From the centre of one fastener hole to the centre of the next fastener hole in a row

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13
Q

What is the edge margin/land edge distance

A

The distance from the centre of the fastener hole to the nearest edge of a sheet

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14
Q

What is the edge margin used for

A

To guide for the installation of fastener holes along the edge of the material.

(Rule of thumb is 2D to 2.5D times the diameter of the rivet)

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15
Q

What is spacing

A

The distance between fastener rows, taken from the hole centres.

(Rule of thumb - 4 to 5D)

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16
Q

What is it meant by the sphere of influence

A

The area of sheet metal over which a rivet will achieve a water tight joint.

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17
Q

What is it meant by the allowance

A

The amount of protrusion of the rivet shank that is sufficient to form the shop head (tail)

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18
Q

How do you prevent skin plates buckling

A

The maximum rivet spacing of a pressurised rivet is 6D or 18t(whichever is smaller)

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19
Q

What is the maximum spacing on a wing structure

A

3.75D (solid rivet ) or 4.5D(10t) for a hi-lok rivet

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20
Q

Why do we dimple skins

A

If the skin is too thin to countersink

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21
Q

What is dimpling

A

The skin is shaped (dented) to accept the head of the countersunk rivet

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22
Q

What are the three different methods of dimpling

A

Coin dimpling
Radius dimpling
Hot dimpling

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23
Q

What are the three ways that you can solid rivet

A

Pneumatic gun
Hand hammer
Continuous squeeze riveting

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24
Q

What is coin dimpling

A

A male die fits through a rivet hole and the coining ram in the female exerts a controlled pressure on the underside of the hole whilst the male is forced into the upper side.
This gives the hole sharply-defined edges. The top and bottom of the dimple are formed to a 100° angle, enabling dimpled skins to be stacked (or nested).

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25
Q

What is radius dimpling

A

The pilot on the male die passes through the hole and presses into the female die.
The dimple formed does not have parallel sides as the lower side has an angle greater than 100°, therefore these dimples cannot be nested.

26
Q

What type of dimpling is better for tight locations

A

Radius dimpling
Because the equipment is smaller

27
Q

What is hot dimpling

A

To prevent this cracking, the material is heated during the process. The equipment is similar to other ways expect the die is heated

28
Q

What materials require hot dimpling

A

Magnesium and some of the harder aluminium alloys (such as 7075) cannot be successfully cold-dimpled, as the material is so brittle that cracks will form during the process.

29
Q

What prince of equipment do you use with a rivet gun for reaction riveting

A

Back up dolly or a bucking bar

30
Q

What is another word for hand riveting

A

Percussion riveting

31
Q

Why when hand riveting do you want to do a minimal blows as possible

A

Because If you do a lot then you might work harden the rivet

32
Q

What is the preferred method of riveting

A

Squeezing method

33
Q

What is the squeezing rivet method

A

Makes the upset head in a single continuous action.
A viable in hydraulic or pneumatic

34
Q

When using a mircrostop countersink tool what must you prevent it from doing

A

Rotating else it may cause surface damage

35
Q

What are the optimum and maximum timing to form an upset head

A

3-4 seconds optimum time
7 seconds maximum

36
Q

What tool can be used to flush countersunk rivets down by shaving them

A

A mircroshaver

37
Q

Cracks in certain rivet heads are not allowed - what material is this

A

Monel and titanium

38
Q

What is the main source of structural fatigue and failure

A

Fastener holes

39
Q

What is grip length

A

When determining the length of a fastener for installation, the combined thickness of the material to be joined must be known. This is the grip length

40
Q

How do you work out the grip length

A

You use a grip length
- put the grip scale in the hole
-hook the gauge onto the rear face of the material
- then read the material thickness on the front of the gauge

41
Q

What is a Jo-bolt

A

A high tensile steel blind rivet which is installed with a ratchet hand tool

42
Q

What is another way to describe the installation of a jo bolt

A

To set it

43
Q

When using a Jo bolt do you have to mill down the excess to make it flush

A

No, with a jo built the bolt breaks at the waisted part when at a set torque. The spring loaded plumber in the tool ejects the unwanted bit.

44
Q

Which way is the torque for a jo bolt applied

A

In a counter clockwise direction

45
Q

How do you remove a jo bolt

A

By a drill

46
Q

What does an additional drive nut on a flush fastener head allow

A

Have small recesses to allow seating torque to be checked in installed fasteners

47
Q

How does visu lok II prevent FOD

A

The drive nut stays on the discarded pintail after installation
(Also steel nut is magnetic so easier retrieval)

48
Q

What are the two parts of a hi-lok and hi-lite fastener

A
  • A threaded pin with a head (universal or countersunk)
  • A collar with an internal thread and an external groove
49
Q

What process is use to harden solid rivets after solution heat treatment

A

Age hardening

50
Q

Solid rivets may be solution treated as many time to save wasting them - true or false

A

False only twice

51
Q

What angle countersinks are available and which is the most common

A

82,100, 120
Most common 100

52
Q

Which rivets require heat treatment and how many times can they be treated?

A

2017 D-, 2024 DD- and 7050 E are brittle and hard so need heat treating

One further cook is allowed before installation but after that rivets have to be discarded

53
Q

If rivets are not used after heat treatment how long can they be kept for and how can this be extended

A
54
Q

What dimpling process provides sharply defined edges

A

Coin dimpling, allows for stacking or nesting of skins

55
Q

How is depth adjusted on a microstop countersink tool

A

By pulling the sleeve back and turning the stop to increase or declares the cut. Then dropped back into its original position.

56
Q

Is cracking around the tail of an AD rivet acceptable when installing solid rivets

A

No, but is allowed with 2017 and 2024 rivets within limits of SRM

57
Q

Are cracks in the head of a Monel and titanium rivet permitted

A

No.

58
Q

What is an advantage of a hi- lite

A

Reduced weight, shorter

59
Q

Where do you use cherrymax rivets

A

High vibration areas

60
Q

Where do you use cherry lock rivets

A

Both thick and thin job items

61
Q

Before you install a blind rivet what hole prep must you do

A

Clean
No burrs
Not damaged

62
Q

What hole prep must you do before inserting a blind rivet

A

Clean
No burrs
Not damaged

Kemble (39 decks)

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