Plastic Parts Design Guide(塑料零件设计指南)
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better
Sinks
Sink
Improved Sinks 槽优化
36
Grained or
Stippled
Surface
Tooled Depression
Offset at Rib
Sinks
Ribs Design 筋设计
37
should be improved
Better
Best
Good Design, Strength
Flow Direction
Gate
Transverse Direction
Glass Fiber Resists Shrinkage in Direction of Alignment/Flow
Gate Location & Shrinkage
浇口位置和收缩率
8
Mineral Reinforced
Shrinkage & Warpage收缩和翘曲
13
Case on a ‘plate + rib’ profile
b
a
Gate L
h w
Gate
Flow angle Isochrones
Shrinkage & Warpage 收缩和翘曲 Glass reinforced materials
Deformation trend
45
Good Design, Example
好的设计，例如：
46
Steel
Plastic
Good Design, Example
好的设计，例如：
47
48
THANKS
22C
530
Flow Direction Knit Line
Weld Line & Strength 焊缝和强度
30
Material Type
Filler Type
Tensile
%
Strength MPa Retained
One Two Gate Gate
Nylon 66 None
79
77
97
Nylon 66 40% Glass 199 103
General applications Special applications
Gate Location & Strength
4
Gate
300
250
200
MPa
150
100
50
0 Tension
Tensile Strength ZYTEL 70G33 23 C, DAM
Flow Tranverse
6
Unreinforced
Flow Direction
Gate
Transverse Direction
Higher Shrinkage in Direction of Molecular Orientation/Flow
Gate Location & Shrinkage
浇口位置和收缩率
7
Glass Reinforced
Higher Shrinkage
Lower Shrinkage
Shrinkage & Warpage收缩和翘曲
10
Uneven Shrinkage
Shrinkage & Warpage收缩和翘曲
11
Bad Flatness
Shrinkage & Warpage收缩和翘曲
12
Good Flatness
Bad Gate Location
Gate
Gate Location & Shrinkage
浇口位置和收缩率
17
Flow Steps
Shrinkage & Warpage收缩和翘曲
Glass reinforced materials
18
Gate
Shrinkage & Warpage收缩和翘曲
19
14
b
Shrinkage [%]
a
Transverse to flow
In flow
1 1.5 2
3
4
Wall thickness [mm]
Shrinkage (S)
S Thin
Sin flow
S Thick S
Shrinkage & Warpage 收缩和翘曲 Unreinforced materials
收缩和翘曲
25
Cooling Side to Side
HOT COOL TOOL
PART
Sizing to Reduce Stress Concentration
Factor (SCF) 调整尺寸以降低应力集中系数（SCF）
26
Stress Concentration Factor
3.0 2.5 2.0 1.5 1.0
Compression
Gate Location & Shrinkage
浇口位置和收缩率
5
Flow Direction
Gate
Transverse Direction
Material Flow Affects Orientation
Gate Location & Shrinkage
浇口位置和收缩率
Deformation trend
15
b
Shrinkage [%]
a
Transverse
In Flow
1 1.5 2
3
4
Wall thickness [mm]
Shrinkage (S)
SThin S
in flow
S Thick S
Gate Location & Shrinkage
浇口位置和收缩率
16
52
Polyprop None
37
32
86
Polyprop 30% Glass 69
23
34
Weld Line & Strength 焊缝和强度
31
Weld line, example
Flow
Flow
Weld Line & Strength 焊缝和强度
32
Weld Line
Gate
Weld Line & Strength 焊缝和强度
0
P = Applied Load R = Fillet Radius T = Thickness
0.2 0.4 0.6 0.8 1.0 1.2 1.4 R/T
Sharp Corners 拐角
27
SHARP CORNERS
Weld Line & Strength 焊缝和强度
1 Gate
2 Gate
41
Bad & Good Design, Example
不好&好的设计，例如：
42
Bad & Good Design, Example
不 Design, Example
不好&好的设计，例如：
44
Bad & Good Design, Example
不好&好的设计，例如：
Effect of Machine Settings on Shrinkage
Shrinkage & Warpage收缩和翘曲
Non-uniform walls
20
Wrong
Right
Shrinkage & Warpage收缩和翘曲
21
Sizing to Reduce Warpage
Bow-In
28
Weld Line
Weld Line & Strength 焊缝和强度
Tensile Strength
29
Weld Line vs. Flow Direction
23 C, 50% RH
180 160 140 120 100
80 60 40 20
0
MPa
ZYTEL 70G33
MINLON RYNITE
Flow Direction
Gate
Transverse Direction
Mineral Resists Shrinkage More Uniformly in All Directions
Shrinkage & Warpage 收缩和翘曲
9
Shrinkage Increases with Wall Thickness
好的设计，强度
38
Good Design, Strength
好的设计，强度
39
1X
1.5X 13.3X
27X
30X
Relative Torsional Stiffness
相对扭转刚度
Bad & Good Design, Example
不好&好的设计，例如：
40
Bad & Good Design, Example
T
2
T
Max R
Reduce Stress Conc.
Reduce Warpage
Shrinkage & Warpage收缩和翘曲 Non-uniform Wall Thickness Contributes To22
• Higher Molded-in Stress • Warpage • Sinks • Voids
Void In Thicker Section
Sink
Shrinkage & Warpage
收缩和翘曲
23
Outside Radius Follows Inside Radius
Good Design
好的设计
24
Gate
Bad 3T
Better
Gate T
Best
Shrinkage & Warpage
塑料材料系列-
1
Plastic Parts Design Guide （塑料零件设计指南培训）
Design Flow
2
Design Concept CAE
CAD
Typical Wall Thickness
3
For Engineering Polymers
millimetric scale
3 0 1 2 4 5 6 7
Improved Design
33
Weld Line
Gate
Sinks
Ribs and Sinks筋和槽
34
Sinks
Ribs and Sinks 筋和槽
35
T
0.5 T (max. 0.75T)
R=T D1
Sink mark
should be improved
T
3T
R max. 0.5T D2
Sinks
Sink
Improved Sinks 槽优化
36
Grained or
Stippled
Surface
Tooled Depression
Offset at Rib
Sinks
Ribs Design 筋设计
37
should be improved
Better
Best
Good Design, Strength
Flow Direction
Gate
Transverse Direction
Glass Fiber Resists Shrinkage in Direction of Alignment/Flow
Gate Location & Shrinkage
浇口位置和收缩率
8
Mineral Reinforced
Shrinkage & Warpage收缩和翘曲
13
Case on a ‘plate + rib’ profile
b
a
Gate L
h w
Gate
Flow angle Isochrones
Shrinkage & Warpage 收缩和翘曲 Glass reinforced materials
Deformation trend
45
Good Design, Example
好的设计，例如：
46
Steel
Plastic
Good Design, Example
好的设计，例如：
47
48
THANKS
22C
530
Flow Direction Knit Line
Weld Line & Strength 焊缝和强度
30
Material Type
Filler Type
Tensile
%
Strength MPa Retained
One Two Gate Gate
Nylon 66 None
79
77
97
Nylon 66 40% Glass 199 103
General applications Special applications
Gate Location & Strength
4
Gate
300
250
200
MPa
150
100
50
0 Tension
Tensile Strength ZYTEL 70G33 23 C, DAM
Flow Tranverse
6
Unreinforced
Flow Direction
Gate
Transverse Direction
Higher Shrinkage in Direction of Molecular Orientation/Flow
Gate Location & Shrinkage
浇口位置和收缩率
7
Glass Reinforced
Higher Shrinkage
Lower Shrinkage
Shrinkage & Warpage收缩和翘曲
10
Uneven Shrinkage
Shrinkage & Warpage收缩和翘曲
11
Bad Flatness
Shrinkage & Warpage收缩和翘曲
12
Good Flatness
Bad Gate Location
Gate
Gate Location & Shrinkage
浇口位置和收缩率
17
Flow Steps
Shrinkage & Warpage收缩和翘曲
Glass reinforced materials
18
Gate
Shrinkage & Warpage收缩和翘曲
19
14
b
Shrinkage [%]
a
Transverse to flow
In flow
1 1.5 2
3
4
Wall thickness [mm]
Shrinkage (S)
S Thin
Sin flow
S Thick S
Shrinkage & Warpage 收缩和翘曲 Unreinforced materials
收缩和翘曲
25
Cooling Side to Side
HOT COOL TOOL
PART
Sizing to Reduce Stress Concentration
Factor (SCF) 调整尺寸以降低应力集中系数（SCF）
26
Stress Concentration Factor
3.0 2.5 2.0 1.5 1.0
Compression
Gate Location & Shrinkage
浇口位置和收缩率
5
Flow Direction
Gate
Transverse Direction
Material Flow Affects Orientation
Gate Location & Shrinkage
浇口位置和收缩率
Deformation trend
15
b
Shrinkage [%]
a
Transverse
In Flow
1 1.5 2
3
4
Wall thickness [mm]
Shrinkage (S)
SThin S
in flow
S Thick S
Gate Location & Shrinkage
浇口位置和收缩率
16
52
Polyprop None
37
32
86
Polyprop 30% Glass 69
23
34
Weld Line & Strength 焊缝和强度
31
Weld line, example
Flow
Flow
Weld Line & Strength 焊缝和强度
32
Weld Line
Gate
Weld Line & Strength 焊缝和强度
0
P = Applied Load R = Fillet Radius T = Thickness
0.2 0.4 0.6 0.8 1.0 1.2 1.4 R/T
Sharp Corners 拐角
27
SHARP CORNERS
Weld Line & Strength 焊缝和强度
1 Gate
2 Gate
41
Bad & Good Design, Example
不好&好的设计，例如：
42
Bad & Good Design, Example
不 Design, Example
不好&好的设计，例如：
44
Bad & Good Design, Example
不好&好的设计，例如：
Effect of Machine Settings on Shrinkage
Shrinkage & Warpage收缩和翘曲
Non-uniform walls
20
Wrong
Right
Shrinkage & Warpage收缩和翘曲
21
Sizing to Reduce Warpage
Bow-In
28
Weld Line
Weld Line & Strength 焊缝和强度
Tensile Strength
29
Weld Line vs. Flow Direction
23 C, 50% RH
180 160 140 120 100
80 60 40 20
0
MPa
ZYTEL 70G33
MINLON RYNITE
Flow Direction
Gate
Transverse Direction
Mineral Resists Shrinkage More Uniformly in All Directions
Shrinkage & Warpage 收缩和翘曲
9
Shrinkage Increases with Wall Thickness
好的设计，强度
38
Good Design, Strength
好的设计，强度
39
1X
1.5X 13.3X
27X
30X
Relative Torsional Stiffness
相对扭转刚度
Bad & Good Design, Example
不好&好的设计，例如：
40
Bad & Good Design, Example
T
2
T
Max R
Reduce Stress Conc.
Reduce Warpage
Shrinkage & Warpage收缩和翘曲 Non-uniform Wall Thickness Contributes To22
• Higher Molded-in Stress • Warpage • Sinks • Voids
Void In Thicker Section
Sink
Shrinkage & Warpage
收缩和翘曲
23
Outside Radius Follows Inside Radius
Good Design
好的设计
24
Gate
Bad 3T
Better
Gate T
Best
Shrinkage & Warpage
塑料材料系列-
1
Plastic Parts Design Guide （塑料零件设计指南培训）
Design Flow
2
Design Concept CAE
CAD
Typical Wall Thickness
3
For Engineering Polymers
millimetric scale
3 0 1 2 4 5 6 7
Improved Design
33
Weld Line
Gate
Sinks
Ribs and Sinks筋和槽
34
Sinks
Ribs and Sinks 筋和槽
35
T
0.5 T (max. 0.75T)
R=T D1
Sink mark
should be improved
T
3T
R max. 0.5T D2