PRESS WORKING

Question 1

Cutting and forming operations performed on relatively
thin sheets of metal

Answer 1

Sheet Metal Working

Question 2

• Thickness of sheet metal = 0.4 mm (1/64in) to 6mm (1/4 in)
• Thickness of plate stock > 6 mm
• Operations usually performed as cold working

Answer 2

Sheet Metal Working

Question 3

Products are parts for consumer and industrial products
 Automobiles and trucks
 Airplanes
 Railway cars and locomotives
 Farm and construction equipment
 Small and large appliances
 Office furniture
 Computers and office equipment

Answer 3

Sheet and Plate Metal Products

Question 4

Advantages of Sheet Metal Parts (give atleast 3)

Answer 4

 High strength
 Good dimensional accuracy
 Good surface finish
 Relatively low cost
 Economical mass production for large
quantities

Question 5

Tooling to perform cutting,
bending, and drawing

Answer 5

Punch and Die

Question 6

Machine tool that performs
most sheet metal operations

Answer 6

Stamping Press

Question 7

Sheet metal products made by
press machine

Answer 7

Stampings

Question 8

Basic Types of Sheet Metal Processes

Answer 8

1. Cutting
2. Bending
3. Drawing

Question 9

Sheet Metal Process under cutting used to separate large sheets

Answer 9

Shearing

Question 10

Sheet Metal Process under cutting used to cut part perimeters out of sheet metal

Answer 10

Blanking

Question 11

Sheet Metal Process under cutting used to make holes in sheet metal

Answer 11

Punching / Piercing

Question 12

Straining sheet around a straight axis

Answer 12

Bending

Question 13

Forming of sheet into convex or concave shapes

Answer 13

Drawing

Question 14

Shearing Process (4)

Answer 14

(1) just before the punch contacts work
(2) punch begins to push into work, causing plastic deformation;
(3) punch compresses and penetrates into work causing a smooth cut
surface;
(4) fracture is initiated at the opposing cutting edges which separates the sheet.

Question 15

Sheet metal cutting operation along a straight line between two cutting edges

Typically used to cut large sheets

Answer 15

Shearing

Question 16

a process for cutting sheet metal to size
out of a larger stock such as roll stock.

Answer 16

Shearing

Question 17

Used as the preliminary step in preparing stock for stamping processes, or smaller blanks for CNC presses

Answer 17

Shears

Question 18

The_____________ produces a shear edge burr, which can be minimized to less than 10% of the material thickness.

Answer 18

Shearing Process

Question 19

The burr is a _________________ between the punch and the die, and the sharpness of the punch and the die.

Answer 19

function of clearance

Question 20

Sheet metal cutting to separate piece (called a blank) from surrounding stock

Answer 20

Blanking

Question 21

Similar to blanking except cut piece is scrap, called a slug

Answer 21

Punching

Question 22

Slug is cut and bur is minimum

Answer 22

Punching

Question 23

No slug is cut, only bur

Answer 23

Piercing

Question 24

A metal fabricating process that removes scrap slug from the metal workpiece each time a punch enters the punching die. This process leaves a hole in the metal workpiece

Answer 24

Punching

Question 25

Punching Operation (Bonus)

Answer 25

1. Punch, made of hardened steel, is forced through a work-piece. 2. The punch cuts the metal and separates it in the form of scrap 3. The hole size depends on the punch size

Question 26

- Ability to produce economical holes in both strip and sheet metal during medium or high production processes. - The ability to produce holes of varying shapes - quickly

Answer 26

Punching

Question 27

Purpose of Angular Clearance [Typical values: 0.25deg to 1.5deg on each side]

Answer 27

allows slug or blank to drop through die

Question 28

Types of Sheet Metal Bending

Answer 28

- V-bending - Edge Bending

Question 29

Type of Sheet Metal Bending; For low production; Performed on a brake press; V-dies are simple and inexpensive; performed with a V-shaped die

Answer 29

V- bending

Question 30

Type of Sheet Metal Bending; performed with a wiping die; For high production; Pressure pad required; Dies are more complicated and costly

Answer 30

Edge Bending

Question 31

If bend radius is small relative to stock thickness, metal tends to _______ during bending

Answer 31

stretch

Question 32

Important to estimate amount of _____________, so that final part length can be obtained as specified dimension

Answer 32

stretching

Question 33

Sheet metal forming to make cup-shaped, box-shaped, or other complex-curved, hollow-shaped parts

Answer 33

Drawing

Question 34

Sheet metal blank is positioned over die cavity and then punch pushes metal into opening

Answer 34

Drawing

Question 35

Products: beverage cans, ammunition shells, automobile body panels Also known as ____________ (to distinguish it from wire and bar drawing

Answer 35

Deep drawing