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Advanced Mould Manufacturing
Content
Design and manufacturing of plastic injection mould ............................................................... 1
1 Injection molding ............................................................................................................... 3
1.1 History........................................................................................................................ 3
1.2 Equipment .................................................................................................................. 3
1.3 Injection molding cycle.............................................................................................. 6
1.4 Molding trial............................................................................................................... 7
1.5 Molding defects.......................................................................................................... 7
2 Injection molding machine............................................................................................... 10
2.1 Types of injection molding machines ...................................................................... 10
2.2 Injection unit ............................................................................................................ 10
2.3 Clamping unit........................................................................................................... 12
3 Injection mould ................................................................................................................ 15
4 Gate type .......................................................................................................................... 19
4.1 Sprue gate................................................................................................................. 20
4.2 Edge gate .................................................................................................................. 20
4.3 Tab gate .................................................................................................................... 21
4.4 Overlap gate ............................................................................................................. 21
4.5 Fan gate .................................................................................................................... 22
4.6 Film or flash gate...................................................................................................... 22
4.7 Diaphragm gate ........................................................................................................ 23
4.8 Internal ring gate. ..................................................................................................... 23
4.9 External ring gate ..................................................................................................... 23
4.10 Spoke gate or multipoint gate................................................................................... 24
4.11 Pin gates ................................................................................................................... 24
4.12 Submarine (tunnel) gates.......................................................................................... 25
4.13 Curved tunnel gate. .................................................................................................. 26
4.14 Hot runner gates ....................................................................................................... 26
4.15 Valve gates ............................................................................................................... 27
5 Why Molds are Expensive ............................................................................................... 28