Plastic Injection molding processing
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Transcript of Plastic Injection molding processing
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Bacical mould Bacical mould structurestructure
Injection Moulding Injection Moulding
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Learn some basic injection moulding
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1.1.Injectio material Injectio material 6.6.Mould process(General)Mould process(General)
2.2.Mould design Mould design 7.7.Mould processMould process((Angle PinAngle Pin))
3.3.Gate materialGate material 8.8.Mould process(SlideMould process(Slide))
4.4.Ejector PinEjector Pin 9.9. Part deflect Part deflect
5.5.Injection Moulding Injection Moulding 10.10. Moulding parametre Moulding parametre
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Injection Injection materialmaterial
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Why we use plastic material ?
Cheap than steel
Light than steel
Insolate。
Resistance chemical reacts。
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Waterproof non corroding
Easy molding
Different material popular application
Recycle and Reuse
Short production cycle time
Rich resource
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PC
PAPC
PATPE
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PC 280oc-320oc 60oc-80oc 120oc/4 h
POM 190oc-220oc 80oc-120oc 120oc/3 h
PA 280oc-300oc 40oc-80oc 80oc/10 h
ABS 230oc-270oc 60oc-80oc 80oc/3 h
ASA 240oc-280oc 40oc-80oc 80oc/3 h
PC/ABS 240oc-280oc 70oc-100oc 110oc/4 h
Material Melt Temp Mould Temp Dry Temp and time
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Clamping Unit Mould Injection unit
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Mould Mould designdesign
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Plastic parts
Mould
Move Mold
Fix Mold
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A B
A= Move Mould
B = Fix MouldWhy it should be move??
If the mould cannot openIf the mould cannot open
the part cannot take it outthe part cannot take it out
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Move MouldMove Mould
Fix MouldFix Mould
Open it in here
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How to put the material inject into mould inside?
Move MouldMove Mould
Fix MouldFix Mould Guid Guid pinpin
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Sprue materialFix MouldFix Mould
Move MouldMove Mould
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Fix MouldFix Mould
Move MouldMove Mould
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The surface is rough, the sprue material is hard to demoulding.
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Sprue
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Sprue
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Sprue
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Sprue
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Sprue material
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Melt material reach to the gate at Melt material reach to the gate at the same timethe same time
its important its important
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What is gateWhat is gate????
Gate Gate = = Joint to the parts and spure materialJoint to the parts and spure material
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Unbalance sprue material design
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FlashFlashShort fillingShort filling
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Balance sprue material design
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Injector pinInjector pin
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Injector pin use to the part eject.Injector pin use to the part eject.
make the complex part eject from the fix mouldmake the complex part eject from the fix mould
easy to take it out by operator or roboteasy to take it out by operator or robot..
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Eject structure as an example
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Eject structure as an example
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Eject structure as an example
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Eject structure as an example
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Eject structure as an example
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Injection Injection moldingmolding
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Clamping unit Mould Injection unit
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20
80
120
300220
Inject/Injection
Crystal Cooling
Heat
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Clamping
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开始注塑
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注塑 = 把已熔化的原料注入模具内
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注塑
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Packing injection
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Packing
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Cooling
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Measure
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Measure
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Measure 松退
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Open mould
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Part enject
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Injector pin return
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Clamping
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Injection molding Injection molding processprocess((GeneralGeneral))
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Injection Injection molding molding
processprocess((SlideSlide))
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e.g
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When mould open, the part cannot take it out.
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Injection molding Injection molding processprocess((Angle pinAngle pin))
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e.g
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Part Part deflectdeflect
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unfillingunfilling
OK
StainStain
OK
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Sliver markSliver mark
BruiseBruise
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Air bubbleAir bubble
OK
OK
OK
BruisedBruised
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BurrBurr FlashFlash
OK ok
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Injector markInjector mark Welding lineWelding line
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Moulding Moulding parameterparameter
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Temperature
Time
Pressure
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- Temperature- Material melt temp- Melting temp.- Moulding temp (cooling temp)
- Time- Injection - Cooling - Packing (keep pressure)- Ejection - Open/close
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- Pressure- Clamping- Injection - Ejection
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Temperature
Advantage
Disadvantage
- Good flow- Easy crystal
- Flash- Innerstress- Shrinkage, sink。。。
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Temperature
Disadvantage
- Less flash- Lower Innerstress
- Welding line- Short filling
Advantage
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Time Disadvantage
- Part size stabilize
- High cost- Low output
Advantage
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TimeDisadvantage
- Largest output
- Size unstablize
Advantage
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Pressure
Disadvantage
- Good flow- Thinner filed can be inject
- Flash- Innerstress
Advantage
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PressureDisadvantage
- Lower innerstress
- welding line- Short filling- Size unstablished
Advantage
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Daisy Dong
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www.forwa-mould.com
Forwa Mould Precise Plastic Mould Co.,Ltd