Hot runner nozzle - Günther Heisskanaltechnik ...
Hot runner nozzle - Günther Heisskanaltechnik ...
Hot runner nozzle - Günther Heisskanaltechnik ...
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Thread<br />
designation<br />
Regular type<br />
screw threads<br />
M8<br />
M10<br />
1.4. 31<br />
iT<br />
Reference values for screw sizes<br />
The centering flange and screws of<br />
single <strong>nozzle</strong>s must absorb the<br />
emerging lift forces.<br />
Screws and centering flange are to<br />
be appropriately dimensioned and<br />
the pitch circle of the screws is to be<br />
kept as small as possible.<br />
Guide values for screw selection can<br />
taken from the table below. Tightening<br />
torque M A for producing the screw<br />
connection must afford sufficient<br />
pretensioning force F v so that the<br />
required initial tension is still present<br />
when under the influence of operating<br />
force (i. e. operating force of the hot<br />
<strong>runner</strong> <strong>nozzle</strong>).<br />
F should be a<br />
Pretensioning force v<br />
factor 2 to 4 greater than the anticipated<br />
operating force. Screws<br />
should be selected which are as<br />
long as possible.<br />
Tightening torque for hot <strong>runner</strong> <strong>nozzle</strong>s<br />
Pretension F v and tightening tor-que M A,<br />
for screws with head beaning surfaces per<br />
DIN EN ISO 4762 and 4014.<br />
Shaft screws ( µ ges. = 0.125)<br />
M12<br />
M16<br />
M20<br />
M24<br />
Maximum pretension F V in kN<br />
Property class<br />
F = force<br />
p = injection<br />
pressure<br />
A = area of the<br />
<strong>nozzle</strong>s shaft Ø<br />
Fine pitch<br />
thread<br />
M8x 1 26 31<br />
40<br />
M10x1,25 41 43<br />
77<br />
M12x1,5<br />
M16x1,5<br />
M20x1,5<br />
M24x2<br />
10.9 12.9<br />
24<br />
38<br />
56<br />
105<br />
165<br />
235<br />
59<br />
114<br />
188<br />
265<br />
28<br />
45<br />
65<br />
122<br />
190<br />
275<br />
69<br />
134<br />
220<br />
310<br />
Maximum tightening torque M in Nm<br />
A<br />
Property class<br />
37<br />
73<br />
125<br />
315<br />
615<br />
1050<br />
<strong>Hot</strong> <strong>runner</strong> <strong>nozzle</strong><br />
Example:<br />
<strong>Hot</strong> <strong>runner</strong> <strong>nozzle</strong>: 5SET50 ( ØS = 22 mm)<br />
Injection pressure: 2000 bar (200 N/ mm 2)<br />
Number of screws: 4<br />
Reliability: 2-cavity<br />
Lift force on the hot <strong>runner</strong> <strong>nozzle</strong>:<br />
p = F A<br />
A =<br />
F = p (N/ mm 2) • A ( mm 2)<br />
F = 200 N/ mm 2 • 380 mm2<br />
F = 76000 N<br />
F = 76000<br />
ges<br />
Pretension F v per screw:<br />
Fv =<br />
Fv =<br />
D 2 ( mm) • π<br />
4<br />
22 mm 2 • π<br />
A =<br />
4<br />
A = 380 mm 2<br />
N<br />
F ges ( N)<br />
Number of screws<br />
76000 N<br />
4<br />
F v = 38000 N per screw<br />
• Sicherheit<br />
• 2 (-fach)<br />
Chosen screws in consideration of 2-cavity<br />
reliability.<br />
4 x M10 - 12.9 je 45 kN per scres<br />
10.9 12.9<br />
132<br />
340<br />
680<br />
1150<br />
43<br />
84<br />
148<br />
370<br />
700<br />
1250<br />
46<br />
90<br />
155<br />
390<br />
800<br />
1350<br />
www.guenther-hot<strong>runner</strong>.com<br />
Subject to technical changes 4/11
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