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Calculation Of The Cutting Edge Size Of The Stamping Die

Working part cutting edge size calculation
1.1.1 Calculation of cutting edge size of blanking concave and punch die
The shape of the part is a square, relatively simple, suitable for separate processing. The characteristic of separate processing is that it is necessary to compare the conditions of [δd+δp]≤Zmax—Zmin
.
After the cutting edge of the blanking die is worn, the size of the blade only changes, and all of them increase. The cutting edge size is generally calculated according to Equation 5-7.
AA=(Amax-x△)0+δd  (Equation 5-7)

After the blanking die cutting the edge wears, the edge size changes only one change, and all become smaller. The size of the cutting edge is generally calculated according to Equation 5-8.

BA=Bmin+x△)δp0 (Equation 5-8)

Where   Amax—The maximum distance between the die edges perpendicular to the feeding direction;
Bmin—The minimum distance between the punch edges perpendicular to the feeding direction.;
       x — convex and concave mold wear coefficient;
       △— Blade manufacturing tolerances;
1)Calculation of cutting edge size of convex and concave die
The basic size 30-0.1+0.1, R5 is converted to R50-0.22 at IT13 level. Check table 5-4

x1=1;X2=0.5 

 δp-0.017 ; δd0.025 ; δp2-0.012 ; δd0.017 ;

Check: 1----│δp│+│δd=0.042mm2xZmaxZmin);

2----│δp│+│δd=0.029mm2xZmaxZmin);

Both satisfy the condition of│δp│+│δd│≤2xZmaxZminn.

1----- 30-0.1+0.1

Dd=30.10.2×10δd=29.90+0.025(mm)

D p =30.10.2×1-0.246x2)δp0 =29.408-0.0170(mm)

Convert DdD pto integer size:

Dd1=29.9-0.020  Dd2=29.410-0.02
2------R50-0.22
Dd
=50.5×0.220δd=4.890+0.017(mm)
D p
=50.5×0.220.246x2)δp0=4.398-0.0120(mm)
Convert
Dd2D p2 to integer size:

Dd2=4.89+0.0200   D p=4.400-0.01

2)Calculation of cutting edge size of punching convex die
The precision of the part is not high, it is IT13 grade, the basic size of the hole isΦ400-0.039, the life of the die should be considered when determining the edge clearance, so a larger clearance should be taken. The results are as follows:

Zmax=0.360mm    Zmin=0.246mm    δp-0.014 δd0.02;

So Z= Zmin=0.246mm

Check: 1----│δp│+│δd=0.034mm2xZmaxZmin);

 Cutting edge size of punching punch   dP=Bmin+x△)δp0

then dP =(9.961+05x0.039) -0.01409.98-0.0140

Cutting edge size of punching die  dd=Bmin+x△+Zmin2δd

       Then dd=(9.961+05x0.039+0.236x2=10.4700.02

Convert it to an integer size: dP9.98-0.0140         dd10.4700.02
Concave and concave die edge size design and appearance shape
Table 5-4 Coefficient X
 
Thickness
t(mm)
Non-circular Round
1 0.75 0.5 0.75 0.5
Workpiece tolerance △/mm
1
1~2
2~4
>4
<0.16
<0.20
<0.24
<0.30
0.17~0.35
0.21~0.41
0.25~0.49
0.31~0.59
≥0.36
≥0.42
≥0.50
≥0.60
<0.16
<0.20
<0.24
<0.30
≥0.16
≥0.20
≥0.24
≥0.30
 
Table 5-5  manufacturing deviation of convex and concave die during regular shape blanking (mm)
Basic size Punch deviation dT Concave die deviation dA
≤18 0.020 0.020
>18~30 0.020 0.025
>30~80 0.020 0.030
>80~120 0.025 0.035
>120~180 0.030 0.040
>180~260 0.030 0.045
>260~360 0.035 0.050
>360~500 0.040 0.060
>500 0.050 0.070
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