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3.1 Injection molding process

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With plastic variety, moisture content, plastic parts molding temperature of the shape and size, and compression mold structure, pre-pressure warm-up, ... – PowerPoint PPT presentation

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Title: 3.1 Injection molding process


1
Chapter III Forming Process of Plastic Molding
3.1 Injection molding process 3.2 Compression
molding process 3.3 Transfer molding process 3.4
Extrusion molding process
2
3.1.1 Principles of Injection Molding
Clamping device
Injection device
right angle connected set
Demolding mechanism
Rod
Cylinder
Heater
Screw
funnel
Motor
Prevent reflux valve
Injection molding, Mainly used for the molding of
thermoplastics
3
3.1.2 Injection Molding Equipment
4
3.1.2 Injection Molding Equipment
5
3.1.2 Injection Molding Equipment
2. Classification of injection molding machine
6
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Horizontal-type
Vertical-type
Angle-type
7
3.1.2 Injection Molding Equipment
3.Plunger type injection molding machine
funnel
Heater
nozzle
Plunger
Heating barrel
shunt
Cooling water
8
3.1.2 Injection Molding Equipment
9
3.1.2 Injection Molding Equipment
3.plunger type injection molding machine
? injection speed is uneven From the plunger
into contact with plastic to compaction plastic,
injection speed is gradually increased
? easy to produce a laminar flow phenomenon and
the barrel difficult to clean
10
3.1.2 Injection Molding Equipment
4 screw injection molding machine
11
3.1.2 Injection Molding Equipment
4. screw injection molding machine
Screw injection machine molding cycle
The advantages of screw injection molding machine
12
3.1.2 Injection Molding Equipment
13
3.1.2 Injection Molding Equipment
plunger - type
screw - type
14
3.1.3 Injection Molding Process
15
3.1.3 Injection Molding Process
16
3.1.3 Injection Molding Process
2 injection process
17
3.1.3 Injection Molding Process
18
3.1.4 Injection Molding Process parameters
19
3.1.4 Injection Molding Process parameters
long Molding cycle, warpage after ejection,
affect dimensional accuracy.
20
1.Plastic flowability 2. Filling pressure 3.
Productivity 4. Product Internal stress 5.
Product finishing 6. cooling time 7. Product
density or crystallinity 8. Mold shrinkage
rate 9. Product deflection
Effect of Mold temperature for molding parts
Usually, the majority of mechanical strength of
molding product increased with the mold
temperature, but the elongation and impact
strength decreased.
21
3.1.4 Injection Molding Process parameters
Determination of mold temperature
22
3.1.4 Injection Molding Process parameters
23
3.1.4 Injection Molding Process parameters
2 Pressure
? Packing pressure
  • To continue exert pressure after the plastic melt
    filling into the mold cavity. The role is to make
    the melt curing under pressure, feeding shrinkage
  • generally less than or equal to the injection
    pressure
  • High packing pressure is easy to produce flash
    and internal stress, while low packing pressure
    cause inadequate filling

24
3.1.4 Injection Molding Process parameters
25
Injection Molding process window
Chalking
Decomposition
flashing
Material temperature
Short shot
Bad surface
Forming difficult
Injection pressure
26
3.2 Compression Molding Process
27
3.2.1 Compression Molding Principle
Compression mold
Compression molding products
28
3.2.1 Compression Molding Principle
1. molding method
Also known as compression molding or suppress.
Mainly used for the molding of thermosetting
plastics, thermoplastics can also be used for
molding.
Compression molding
Powder, granular or fiber material
Placed in cavity of the molding temperature
Clamping pressure
Forming curing
29
3.2.1 Compression Molding Principle
30
3.2.1 Compression Molding Principle
2. compression molding characteristics
? simple operation, and simple mold structure
(5) production cycle is long and inefficient
Multi cavities
31
3.2.2 Compression Molding Equipment
32
3.2.3 Compression Molding Process
Compression molding circulation
33
3. 2.3 Compression Molding Process
34
3.2.3 Compression Molding Process
35
3.2.3 Compression Molding Process
36
3.2.3 Compression Molding Process
Dry
Warm-up
37
3. 2.3 Compression Molding Process
38
3.2.3 Compression Molding Process
39
3.2.3 Compression Molding Process
40
3.2.3 Compression Molding Process
41
3.2.3 Compression Molding Process
42
3.2.3 Compression Molding Process
43
3.2.3 Compression Molding Process
44
3.2.3 Compression Molding Process
45
Compression Molding Circulation
46
3.2.4 Compression Molding Process parameters
47
3.2.4 Compression Molding Process parameters
48
3.2.4 Compression Molding Process parameters
49
3.2.4 Compression Molding Process parameters
50
3.2.4 Compression Molding Process parameters
51
3.3 Transfer Molding Process
Transfer molding
52
3.3.2 Transfer Molding Characteristics
53
3.3.2 Transfer Molding Characteristics
And compression molding difference is
54
3.3.3 Transfer Molding Process parameters and
Equipment
55
3.3.3 Transfer Molding Process parameters and
Equipment
56
3.4 Extrusion molding process
57
3.4.1 Extrusion Molding Process
Feeding port

Thrust bearing
Gear box
Barrel and screw
Heater
Head connector
Drive motor
Base
Cooling system
Extruder
58
3.4.2 Extrusion Equipment
Shaping device
Plastic pipe
Head die
Cutting device
drawing device
Extruder
Cooling tank
59
3.4.3 Extrusion Process
60
3.4.3 Extrusion Process
Plastic parts setting and cooling
Setting plate
Product
Simple sliding setting device
Cooling water inlet
Cooling water outlet
vacuum section
Cooling section
Profile
Vacuum shaping device
The sliding of the co-shaping device
setting way
61
3.4.3 Extrusion Process
62
3.4.4 Extrusion Process parameters
63
3.4.4 Extrusion Process parameters
64
Thinking and Practice
  1. Fill in the injection molding process flow
    diagram
  2. Different characteristics of the screw plunger
    injection machine
  3. What's the difference of transfer molding and
    compression molding
  4. What are the extrusion molding Process parameters
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