Section 5: Sheet Metalworking Flashcards

1
Q

Categories of Sheet Metalworking

A

Performed on presses:
-Sheet metal cutting:
- Sheet metal shearing
- Sheet metal blanking
- Sheet metal punching
- Sheet metal bending:
- V-bending
- Edge bending
- Drawing
Not performed on presses
- Stretch forming
- Roll bending
- Roll forming
- Spinning

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2
Q

Define Sheet Metalworking

A

Cutting and forming operations performed on relatively thin sheets of metal:
- Thickness of foil <= 0.4mm
- Thickness of sheet metal = 0.4mm-6mm
- Thickness of plate stock > 6mm

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3
Q

Are Sheet metalworking operations usually hot or cold working

A

cold working

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4
Q

What is the thickness of the foil for sheet metalworking

A

<= 0.4mm

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5
Q

What is the thickness of sheet metal in sheet metalworking

A

0.4 mm - 6 mm

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6
Q

Thickness of plate stock in sheet metalworking

A

> 6mm

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7
Q

Advantages of Sheet Metal Parts

A
  • High strength
  • good dimensional accuracy
  • good surface finish
  • relatively low cost
  • economical mass production for large quantities
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8
Q

Punch and die

A

tooling to perform cutting, bending, and drawing

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9
Q

Stamping press

A

Machine tool that performs most sheet metal operations

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10
Q

Stampings

A

sheet metal products

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11
Q

Sheet Metal Shearing

A

Category of sheet metal cutting to separate large sheets

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12
Q

Sheet Metal Blanking

A

Category of sheet metal cutting to cut part perimeters of sheet metal

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13
Q

Sheet Metal Punching

A

Category of sheet metal cutting to make punch holes in sheet metal

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14
Q

Sheet Metal Bending

A

Straining Sheet around a straight axis

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15
Q

Sheet Metal Drawing

A

Forming of sheet into convex or concave shapes

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16
Q

Scrap and part in Blanking

A
  • Blank is the part (interior of the cut)
  • Strip is the scrap (exterior of cut)
17
Q

Scrap and part in punching

A

Part is the exterior
- Slug is the scrap (hole punched out)

18
Q

In sheet metal bending, what happens to the inside and outside of the neutral plane?

A

Metal on the inside of the plane is compressed, and the metal outside of the plane is stretch
Like turning the Letter I into the letter C

19
Q

V-bending

A

-performed with a V-shaped die
- low production (smaller Q)
- performed on a press brake
- v-dies are simple and inexpensive

20
Q

Edge Bending

A
  • performed with a wiping die
  • high production (Larger Q)
  • pressure pad required
  • Dies are more complicated and costly
21
Q

Sheet metal drawing process and products and other name

A

Process: sheet metal blank is positioned over a die cavity and then punched into opening
Products: cans, car body panels
AKA Deep Drawing

22
Q

Most press-working operations are performed with what tooling and why?

A

punch and die tooling
- Custom-designed for a particular part

23
Q

A name for high production dies

A

stamping die

24
Q

Sheet metalworking operations not performed on presses

A
  • stretch forming
  • roll bending and forming
  • spinning
25
Stretch forming
sheet metal is stretched and simultaneously bent to achieve shape change
26
Roll Bending
Large metal sheets and plates are formed into curved sections using rolls
27
Roll Forming
Continuous bending process in which opposing rolls produce long sections of formed shapes from coil or strip stock
28
What is Spinning and its three types
Sheet metal forming process in which an axially symmetric part is gradually shaped over a rotating mandrel using a rounded tool or roller Three types: - Conventional spinning - shear spinning - tube spinning
29
Conventional spinning vs Shear spinning
Conventional spinning leaves the thickness of the sheet metal unchanged. Shear spinning reduces it
30
How does Conventional spinning work?
bends the metal around a moving circular axis to conform to the outside surface of the axisymmetric mandrel. The thickness of the metal therefore remains unchanged
31
How does shear spinning work
outside diameter remains constant therefore wall thickness is reduced
32
Tube Spinning
Tube spinning is used to reduce the wall thickness and increase the length of a tube by means of a roller applied to the work over a cylindrical mandrel. Similar to shear spinning but in a tube rather than a flat disk