Sip 09 Injection Molding B&W


Plastic Injection
Molding
Mold and Injection Unit
movable mold platen
granular plastic material
fixed platen
hopper
cavity
nozzle
half of
mold
mold
clamping
reciprocating screw
force
electric band heaters
cylinder
force half of mold
Mold cost
sprue
runner
sprue bushing
cooling channels
cavity
cavity
plate
insert
molded
part
core plate
core insert
ejector
pins
Stampo a
canali caldi di
distribuzione
autoisolanti
Mold cost: cavity plate & core plate
Basic Mold Mechanisms
cavity insert
angle
pin
cavity cavity
rotating
plate
cavity
threaded
plate
core pin
cavity
core
core pin
slideway
plate
for side
hole gear
core
activated by
insert
core
hydraulic
plate
gear rack
cylinder
angle-pin activated side-pull unscrewing device
Meccanismo addizionale Ore di manodopera aggiuntive per meccanismo
Side pulls 65 (50 ÷ 80)
Internal lifters 150 (100 ÷ 200)
Meccanismi di svitamento 250 (200 ÷ 300)
Design rules
Undercuts
Evitare il piazzamento di depressioni che richiedano
meccanismi ausiliari retrattili all apertura degli stampi, nella
superficie interna del pezzo.
Process cost: machine size & rate
Cavity pressure
Andamento della pressione del fuso in una sezione trasversale di flusso dello
stesso. Si noti che la pressione rilevata all ingresso della cavitÄ… si attesta su
valori pari a circa la metÄ… della pressione generata dal sistema di iniezione
Process cost: cycle time
Injection time
Cooling time
Mold
reset
time
Discharge
Sealing
time

point
Sealed
cooling
Packing
time
Time
Pressure


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