Injection Molding - A Young Production Method Injection Molding - A Discontinuous Single-Stage Process Injection Molding - The Injection Molding Machine and Mold
Full description
Descripción: specification
Injection Molding Control
Injection Molding - A Young Production Method Injection Molding - A Discontinuous Single-Stage Process Injection Molding - The Injection Molding Machine and MoldDescrição completa
Descripción: Injection Moulding Mould Design. Criteria to select mould for Injection Moulding Machine. PIMM
specificationFull description
Descripción: Injection Molding
Full description
Descripción: Injection molding design guide.
injection molding troubleshootingFull description
Full description
Materials, Design, Process Optimization, Troubleshooting and other Practical Information. this reference guide contains general recommendations intended for use within the plastic injection …Full description
Full description
Diseño de moldes de inyecciónFull description
plastic parts injection moldinf
Design with Plastics - for Injection Molding process.
Injection MoldingProcess Description ver. 1
ME 4210: Manufacturing Processes and Engineering Prof. J.S. Colton
1
Overview • Equipment • Process
ME 4210: Manufacturing Processes and Engineering Prof. J.S. Colton
2
Equipment Clamp
Mold
Barrel Hopper
ME 4210: Manufacturing Processes and Engineering Prof. J.S. Colton
3
Equipment
ME 4210: Manufacturing Processes and Engineering Prof. J.S. Colton
4
Machine schematic
ME 4210: Manufacturing Processes and Engineering Prof. J.S. Colton
5
Mold
ME 4210: Manufacturing Processes and Engineering Prof. J.S. Colton
6
Mold
ME 4210: Manufacturing Processes and Engineering Prof. J.S. Colton
7
Modular molds
ME 4210: Manufacturing Processes and Engineering Prof. J.S. Colton
8
Mold schematic
ME 4210: Manufacturing Processes and Engineering Prof. J.S. Colton
9
Mold runner
sprue
cavity
gate
sprue
nozzle
front
ejection pin
side
ME 4210: Manufacturing Processes and Engineering Prof. J.S. Colton
10
Process
ME 4210: Manufacturing Processes and Engineering Prof. J.S. Colton
11
Process • Pellets placed in hopper • Pellets fall into barrel through throat • Pellets packed to form solid 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
12
Process • Melted plastic forms shot in front of screw – screw moves back as plastic moves forward (reciprocating screw)
ME 4210: Manufacturing Processes and Engineering Prof. J.S. Colton
13
Process • Screw moves forward to inject plastic into mold cavity
• Part cools and solidifies – next shot is made
ME 4210: Manufacturing Processes and Engineering Prof. J.S. Colton
14
Process • Mold opens • Ejection pins move forward to eject part
• Mold closes • Process starts again
ME 4210: Manufacturing Processes and Engineering Prof. J.S. Colton
15
Solid bed • Pellets crushed together • Air ejected
ME 4210: Manufacturing Processes and Engineering Prof. J.S. Colton
16
Melting zone • Solid bed melted by mechanical shear barrel
secondary mixing flow
screw flight solid bed
ME 4210: Manufacturing Processes and Engineering Prof. J.S. Colton
17
Homogenization zone • Melted polymer is homogenized thermally and color-wise.
ME 4210: Manufacturing Processes and Engineering Prof. J.S. Colton
18
Injection pressure • Typically 15,000 psi • Ranges from 3,000 to 40,000 psi • Hydraulic pressure is about 10x less
ME 4210: Manufacturing Processes and Engineering Prof. J.S. Colton
19
Process time Open and eject part
Close mold Injection
1
33 35
5
Pack and hold Part cooling
15
ME 4210: Manufacturing Processes and Engineering Prof. J.S. Colton
20
Pressure history Cycle time
Part ejection
Cooling
Pack
Gate freeze off
25
Injection
50 Fast closing
Cavity pressure (MPa)
Mold closed time
0 0
5
15
33 35
Time (s) ME 4210: Manufacturing Processes and Engineering Prof. J.S. Colton
21
Temperature history Cooling Part ejection
gate Pack
Gate freeze off
100
Injection
part Fast closing
Temperature (oC)
200
0 0
5
15
33 35
Time (s) ME 4210: Manufacturing Processes and Engineering Prof. J.S. Colton
22
Gates and freeze-off
Filling & Packing
Cooling
ME 4210: Manufacturing Processes and Engineering Prof. J.S. Colton
23
ME 4210: Manufacturing Processes and Engineering Prof. J.S. Colton