Molding Process Introduce 注塑工艺介绍

Advantages Improved Aesthetics Low Pressure Process Lower Part Weight Reduced Cycle Time
• • • •
Disadvantages Defect on Every Part More Complex Process High Tooling Costs 23 Licensing Costs
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Mucell微孔发泡的产品表现形式
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Pacific ADS Design Training November 2003
Process Selection - Injection
Structural Foam Injection Molding
Inert Gas Blowing Agent with Resin
Pacific ADS Design Training November 2003
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Process Selection - Injection
Injection Molding Machine
Mold
Hopper
Clamp
Extruder Barrel with Heating Bands
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Pacific ADS Design Training November 2003
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Need special equipment
Pacific ADS Design Training November 2003
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Pacific ADS Design Training November 2003
Process Selection Biblioteka Baidu Injection
Injection Molding Introduction
Injection molding makes possible mass production of intricate, high performance, tight tolerance parts with very little secondary labor and minimal waste.
Mucell微孔发泡工艺的塑化单元
01 04 02 03 05
01 Needle valve nozzle 02 Gas injector 03 MuCell®-plasticizing screw (L/D ratio: 22:1~24:1) 04 Homogenizing section for gas/melt mixture 05 Plastics granules without blowing agent Pacific ADS Design Training November 2003
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Pacific ADS Design Training November 2003
Process Selection - Injection
Injection Unit The Reciprocating Screw
Screw Slides Back: Feed, Melt
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Pacific ADS Design Training November 2003
Process Selection - Injection
Injection Unit The Reciprocating Screw
Ready for Injection
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Pacific ADS Design Training November 2003
Process Selection - Injection
Injection Unit The Reciprocating Screw
Heating Coils (Filling) Throat
Rotation Injection Force Back Pressure
Nozzle
Screw Pushes Forward: Inject
Screw Slides Back: Feed, Melt
Disadvantages • Longer Cycle Time • Aesthetics • Blending Required
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Process Selection - Injection
Structural Foam
SKIN CORE SKIN
• Increases the attainable wall thickness • Gas expands inside plasticized material to create foam core
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Pacific ADS Design Training November 2003
Process Selection - Injection
Processing of Engineering Thermoplastics:
Materials Processing Processing
•Injection Molding •Extrusion •Compression Molding •Thermoforming •Blow Molding •Secondary Operations •Comparisons
Process Selection - Injection
Injection Unit The Reciprocating Screw
Pellets
Melt
Feed Section
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Pacific ADS Design Training November 2003
Process Selection - Injection
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Pacific ADS Design Training November 2003
Process Selection - Injection
Gas Assist Injection Molding
Gas Introduced After Short Shot to Pack out Part
• • • •
Co- Injection Molding
Co- Injection Molding
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Pacific ADS Design Training November 2003
Four Component
Process Selection - Injection
Structural Foam Part
Co- Injection Molding
Two - Component
Pacific ADS Design Training November 2003
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Co- Injection Molding
Co- Injection Molding
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Three Component
Pacific ADS Design Training November 2003
Pacific ADS Design Training November 2003
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Process Selection - Injection
Standard Injection Molding
Advantages
•Fast Cycle Times •Complex Parts •High Volume •Aesthetics
Gas Created Cavity
Gas Assist Injection Molded Shipping Container
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Pacific ADS Design Training November 2003
Process Selection - Injection
Heat & Cool System
Pacific ADS Design Training November 2003
Disadvantages • High Pressure Process • Limited Large Part Capability • High Tooling Cost
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Co- Injection Molding
Metering
Compression
Feed
Feed Section: Picks up pellets and carries them forward.
Transition Section: central portion of the screw with reduced channel depth which compresses plastic, eliminating air between pellets and heating and melting them. Metering Section: Final plasticizing of melt.
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Pacific ADS Design Training November 2003
Process Selection - Injection
Clamping System
Nozzle
Movable Platen
Mold
Stationary Platen
• Provides motion and force to open and close mold • Clamping Force: maximum holding force in tons that a machine can maintain
Injection Unit The Reciprocating Screw
Screw Pushes Forward: Inject
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Pacific ADS Design Training November 2003
Process Selection - Injection
Screw Description
Relative to Standard Injection Molding
Advantages • Large Part Capability • Low Pressure Process • High Stiffness to Weight Ratio
Pacific ADS Design Training November 2003
LEXAN FOAMABLE RESIN Business Machine Chassis
High Strength and Rigidity in Larger Parts
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Pacific ADS Design Training November 2003
Mucell微孔发泡设备
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Pacific ADS Design Training November 2003
open
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Pacific ADS Design Training November 2003
Process Selection - Injection
Heat & Cool Equipments
Part
Cooling Water
Ｔ2
Ｔ1
Ｔ3
Boiler
： Channel
Valve Unit
Cooling Channel
Pacific ADS Design Training November 2003
Process Selection - Injection
Gas Assist Injection Molding
Gas Assist Molded Rib
Gas Injection Defect
Injection Molded Rib Sink
Mold Temperature Vicat Softening point plasticization temperature rise plasticization
Process
Valve unit hot water hot water cold water cold water hot water
Molding Process Introduce
Daniel zuo 1
Pacific ADS Design Training November 2003
Process Selection
Processing of Engineering Thermoplastics:
•Injection Molding •Extrusion •Compression Molding •Thermoforming •Blow Molding •Secondary Operations •Comparisons