塑料件设计指导《PlasticDesignGuide》资料重点
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Engineering Polymers / DuPont (Korea) Inc.
12
Shrinkage & Warpage Case on a ‘plate + rib’ profile
b
a
Gate L
h w
Gate
Flow angle Isochrones
Engineering Polymers / DuPont (Korea) Inc.
8
Shrinkage & Warpage
Shrinkage Increases with Wall Thickness
Higher Shrinkage
Lower Shrinkage
Engineering Polymers / DuPont (Korea) Inc.
9
Shrinkage & Warpage Uneven Shrinkage
Gate
Engineering Polymers / DuPont (Korea) Inc.
18
Shrinkage & Warpage
Effect of Machine Settings on Shrinkage
Engineering Polymers / DuPont (Korea) Inc.
7
Gate Location & Shrinkage
Mineral Reinforced
Flow Direction
Gate
Transverse Direction
Mineral Resists Shrinkage More Uniformly in All Directions
Engineering Polymers / DuPont (Korea) Inc.
6
Gate Location & Shrinkage
Glass Reinforced
Flow Direction
Gate
Transverse Direction
Glass Fiber Resists Shrinkage in Direction of Alignment/Flow
Engineering Polymers / DuPont (Korea) Inc.
Gate
Engineering Polymers / DuPont (Korea) Inc.
16
Gate Location & Shrinkage
Flow Steps
Engineering Polymers / DuPont (Korea) Inc.
17
Shrinkage & Warpage Glass reinforced materials
Gate
Flow Tranverse
4
Gate Location & Shrinkage
Flow Direction
Gate
Transverse Direction
Material Flow Affects Orientation
Engineering Polymers / DuPont (Korea) Inc.
13
Shrinkage & Warpage
Glass reinforced materials
Deformation trend
b
Shrinkage [%]
a
Transverse to flow
In flow
1 1.5 2
3
4
Wall thickness [mm]
Shrinkage (S)
S Thin
S in flow
S Thick S
Engineering Polymers / DuPont (Korea) Inc.
14
ቤተ መጻሕፍቲ ባይዱ
Shrinkage & Warpage Unreinforced materials
Deformation trend
b
Shrinkage [%]
a
Transverse
In Flow
5
Gate Location & Shrinkage
Unreinforced
Flow Direction
Gate
Transverse Direction
Higher Shrinkage in Direction of Molecular Orientation/Flow
Engineering Polymers / DuPont (Korea) Inc.
Design Guidelines
Version 1.0
Nov . 24 . 2004
Technical Center / Engineering Polymers
DuPont (Korea) Inc.
Engineering Polymers / DuPont (Korea) Inc.
1
Design Flow
1 1.5 2
3
4
Wall thickness [mm]
Shrinkage (S)
S Thin
S in flow
S Thick S
Engineering Polymers / DuPont (Korea) Inc.
15
Gate Location & Shrinkage
Bad Gate Location
Design Concept
CAE
CAD
Engineering Polymers / DuPont (Korea) Inc.
2
Typical Wall Thickness
For Engineering Polymers
millimetric scale
3 0 1 2 4 5 6 7
General applications Special applications
Engineering Polymers / DuPont (Korea) Inc.
10
Shrinkage & Warpage
Bad Flatness
Engineering Polymers / DuPont (Korea) Inc.
11
Shrinkage & Warpage
Good Flatness
Engineering Polymers / DuPont (Korea) Inc.
3
Gate Location & Strength
300 250 200
MPa
150 100
50 0
Tension
Compression
Tensile Strength ZYTEL 70G33 23 C, DAM
Engineering Polymers / DuPont (Korea) Inc.