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moulding
Injection MoldingMolding
Process Description ver. 1

ME 4210: Manufacturing Processes and Engineering
Prof. J.S. Colton © GIT 2009

1

Overview
• Equipment
• Process

ME 4210: Manufacturing Processes and Engineering
Prof. J.S. Colton © GIT 2009

2

Equipment
Clamp
Cl

Mold
M ld

Barrel
B
l
Hopper

ME 4210: Manufacturing Processes and Engineering
Prof. J.S. Colton © GIT 2009

3

Equipment

ME 4210: Manufacturing Processes and Engineering
Prof. J.S. Colton © GIT 2009

4

KrausMaffei at Ford - 4000 tonnes

ME 6222: Manufacturing Processes and Systems
Prof. J.S. Colton © GIT 2009

5

Machine schematic

ME 4210: Manufacturing Processes and Engineering
Prof. J.S. Colton © GIT 2009

6

Mold

ME 4210: Manufacturing Processes and Engineering
Prof. J.S. Colton © GIT 2009

7

Mold

ME 4210: Manufacturing Processes and Engineering
Prof. J.S. Colton © GIT 2009

8

Modular molds

ME 4210: Manufacturing Processes and Engineering
Prof. J.S. Colton © GIT 2009

9

Mold schematic

ME 4210: Manufacturing Processes and Engineering
Prof. J.S. Colton © GIT 2009

10

Mold runner sprue

cavity

gate

sprue p nozzle

front

ejection pin side

ME 4210: Manufacturing Processes and Engineering
Prof. J.S. Colton © GIT 2009

11

Process

ME 4210: Manufacturing Processes and Engineering
Prof. J.S. Colton © GIT 2009

12

Process
• Pellets placed in hopper
• Pellets fall into barrel through throat
• P ll t packed t f
Pellets
k d to form solid b d lid bed
– air forced out through hopper

• Pellets melted by mechanical shear between barrel and screw

ME 4210: Manufacturing Processes and Engineering
Prof. J.S. Colton © GIT 2009

13

Process
• Melted plastic forms shot in front of screw – screw moves b k as plastic moves back l ti forward (reciprocating screw)

ME 4210: Manufacturing Processes and Engineering
Prof. J.S. Colton © GIT 2009

14
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