Hyrum
5th December 2011, 11:45 PM
I am building an injection molding control right now to control an old Arburg injection molder I have. It is coming along very nicely although I am new to injection molding. I have owned 3 injection molders but they were all small and had plunger style injection units. (one was a Morgan)
I have a few questions on what parameters need to be considered and a little about the process. If you can give any help please comment.
Below is what I gather from what the cycle and the questions I have:
1 Clamp- From what I see there is a low pressure for the first part of the stroke and then high pressure once the mold is nearly closed. The only parameter I plan on having in the control is an alarm if the clamp doesn't close after a specified time.
2 Inject- Plastic flows into the mold and pressure is held for a specified time.
3 Extrude- All I know is the screw rotates for a specified amount of time. Is the hold pressure maintained? Does the injection unit retract after this? Please give detail.
4 Open- The only parameter I plan on having in the control is an alarm if the clamp doesn't open after a specified time.
5 Eject- Is there any reason to have the ejector knock more than once? I seem to remember a machine on youtube knock twice.
In case you are interested in my machine:
Its an Arburg Allrounder 300 it has a hydraulic system that powers all the cylinders and the screw. Position is monitored by 9 limit switches
Toggle open
Toggle High pressure
Toggle closed
Knock out in
Knock out out
4 switches on the injection unit
I'm documenting the process of getting this machine going on www.allrounder300.blogspot.com (http://www.allrounder300.blogspot.com)
Thanks!
I have a few questions on what parameters need to be considered and a little about the process. If you can give any help please comment.
Below is what I gather from what the cycle and the questions I have:
1 Clamp- From what I see there is a low pressure for the first part of the stroke and then high pressure once the mold is nearly closed. The only parameter I plan on having in the control is an alarm if the clamp doesn't close after a specified time.
2 Inject- Plastic flows into the mold and pressure is held for a specified time.
3 Extrude- All I know is the screw rotates for a specified amount of time. Is the hold pressure maintained? Does the injection unit retract after this? Please give detail.
4 Open- The only parameter I plan on having in the control is an alarm if the clamp doesn't open after a specified time.
5 Eject- Is there any reason to have the ejector knock more than once? I seem to remember a machine on youtube knock twice.
In case you are interested in my machine:
Its an Arburg Allrounder 300 it has a hydraulic system that powers all the cylinders and the screw. Position is monitored by 9 limit switches
Toggle open
Toggle High pressure
Toggle closed
Knock out in
Knock out out
4 switches on the injection unit
I'm documenting the process of getting this machine going on www.allrounder300.blogspot.com (http://www.allrounder300.blogspot.com)
Thanks!