6.1 checking m aximum i njection v olume 6.2 checking i njection p ressure
DESCRIPTION
Chapter Ⅵ Checking Process Parameters of Injection Machine. 6.1 Checking M aximum I njection V olume 6.2 Checking I njection P ressure 6.3 Checking C lamping F orce 6.4 Checking Size of Mold Parts 6.5 Checking M o ld Opening stroke 6.6 Checking E jector. - PowerPoint PPT PresentationTRANSCRIPT
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6.1 Checking Maximum Injection Volume6.2 Checking Injection Pressure
6.3 Checking Clamping Force
6.4 Checking Size of Mold Parts
6.5 Checking Mold Opening stroke
6.6 Checking Ejector
Chapter Ⅵ Checking Process Parameters of Injection Machine
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6.1 Checking Maximum Injection Volume
The actual injection volume should be less than 80% injection machine’s
maximum injection volume
injection volume shown by volume :
V ≤ 0.8Vm
where,
V - Total volume of plastic parts (plastic parts + gating system)
V m - Maximum injection volume of injection machine (cm3)
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The injection volume shown by weight:
G ≤ 0.8G m G = p'V
where,
G - The total weight of plastic parts (plastic parts + gating system)
G m - The maximum injection volume of the injection machine (g)
p'- Plastic barrel temperature and pressure density (g/cm3)
6.1 Checking Maximum Injection Volume
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6.2 Checking Injection Pressure
Check the Rated injection pressure of injection machine can meet the required pressure or not
P n ≥ P iWhere,P i - The required pressure of plastic molding injectionP n - The nominal injection pressure injection machine
P i will be affected by the gating system, the resistance of the cavity, the m
old temperature and other factors.
When P i is too big: lager flash, demolding difficult, poor surface quality,
and big internal stress
When P i is too small: can not successfully filled cavity, form inadequate
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6.3 Checking Clamping Force
Where, F c – The nominal clamping force of injection machine (N) A p – The total projected area of the plastic pieces and pouring system in the parting surface(mm2) q - The average pressure of the plastic melt cavity (MPa)
The clamping force is the maximum force of the clamping device applied to the mold
Fc≥q·Ap
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Nozzle size locating hole size
Rod spacing Mold closed thickness
Mounting screw
hole size
6.4 Checking Size of Mold Parts
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1.Nozzle size
The spherical radius of gate sets R and the spherical radius of nozzle front end R0Nozzle diameter d0 and gate sets small side hole diameter dRelationship: d = d0 + (0.5-1) mm R = R0 + (1-2) mm
6.4 Checking Size of Mold Parts
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2.locating hole size
h: small mold, take (8-10) mm Large mold,take (10-15) mm
6.4 Checking Size of Mold Parts
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3.Rod spacing Dimensions of one mold should be less than the rod spacing of the i
njection molding machine to ensure that the mold can be installed on th
e injection machine work table.
6.4 Checking Size of Mold Parts
The relationship between mold size and rod spacing of the injection machine
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4.Mold closed thickness
Hmax≥Hm≥Hmin
6.4 Checking Size of Mold Parts
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5.Mounting screw hole size
Mold lighter weight using plate fixed
Mold heavier weight using screw fixed
6.4 Checking Size of Mold Parts
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Single-parting surface mold: S> = H1 + H2 + (5 ~ 10) mmDouble-parting surface mold: S> = H1 + H2 + a + (5 ~ 10) mm
6.5 Checking Mold Opening stroke
Checking opening stroke of single-parting mold
1-Fixed mode 2-Dynamic model
Checking opening stroke of double-parting mold1-Fixed mode 2-Flow plate 3-Dynamic model
maximum stroke of mold opening of injection machine(S) is independent of mold thickness (Hm)
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6.5 Checking Mold Opening stroke
maximum stroke of mold opening of injection machine(S) is independent of mold thickness (Hm)
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Single parting surface mold: S0 = Hm + [H1 + H2 + (5 ~ 10)]
Double parting surface mold : S0 = Hm + [H1 + H2 + a + (5 ~ 10)]
6.5 Checking Mold Opening stroke
Stroke checking of hydraulic clamping part
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maximum mold opening stroke of side parting core-pulling mechanism (S)
When H4 in> H1 + H2,
S = H4 in (5 ~ 10) mm
When H4 in <H1 + H2,
S = H1 + H2 + (5 ~ 10) mm
6.5 Checking Mold Opening stroke
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6 .6 Checking Ejector
center eject
Sides dual mechanical eject
center hydraulic eject and side dual mechanical ejector
center eject and auxiliary fuel tank
classification of ejector :
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Vertical injection machine
Horizontal injection machine
Right-angle injection machine
calculation of injection machine
Thinking and Practice
XS-ZY-500 : means the injection machine with a maximum injection volume
of 500cm3
XS : Plastic molding machine Z : Injection machine Y : Screw
S-ZY-190/90 : The injection volume is 190cm3 、 Clamping force is 90t
SYS-30 : means the vertical injection machine with a injection volume of
30g