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E
 



Table A number of draw
 
H/D
P
 
 
< 0.75
1
 
 
0.75 - 1.5
2
 
 
1.5 - 3.0
3
 
 
3.0 - 4.7
4
 
draw ratio H = Inside height
D = mean Diameter
N > 4 Thickness
P = Number of draws


 

By definition, a draw piece part which requires only one draw operation is considered to be a shallow draw, and a draw piece part which require more than one drawing operation is consider to be deep draw. In the nutshell, the number of draws in deep drawing process can be estimated by table A.

When a sheet metal parts draw piece is drawn from a flat blank, the diameter of the draw piece is smaller than the diameter of the flat blank. The difference in diameter can be express as a percentage of the original 1st blank diameter.
Material = Steel
Sheet metal
Thickness
( inch )
1st draw
2nd draw
3rd draw
4th draw
< 0.063
40-48
20-25
18-20
16-18
0.063 - 0.125
40-48
15-18
14-15
13-14
0.125 - 0.187
40-48
12-15
11-12
10-11
0.187 - 0.25
40-48
10-13
9-10
8-9
> 0.25
40-48
8-10
7-8
6-7
Material = Brass
< 0.063
44-50
20-29
18-23
18-20
0.063 - 0.125
44-50
16-23
15-17
12-15
0.125 - 0.187
44-50
14-17
12-14
11-13
0.187 - 0.25
44-50
10-14
9-11
8-10
> 0.25
44-50
9-11
8-9
7-8
 

 

 

 

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