Chuck H
4th October 2021, 08:46 PM
I have worked through the issues mentioned in my previous thread http://www.injectionmoldingonline.com/forum/showthread.php?t=1441
After getting it to clamp down on a block of aluminum I turned on the heaters and let it come up to temperature (~350) in all zones and manually tried screw rotation, carriage movement, etc. As far as I can tell all functions work.
Now I need to try to set it (Trueblood, 30-ton, screw-type) up to run ABS. I'm working slowly because I don't want to damage anything ... including me. I have only ever used a ram-type machine and this is a home shop/small business type environment at my home.
One resource I could use would be an online document that would cover the entire cycle from clamp to done but, especially the sequence of events during the injection cycle. I "assume" something like:
- (in my case) table rotates lower half of mold into place
- clamp closes and maintains clamping pressure
- carriage moves forward to press nozzle against mold.
- screw moves forward without turning to inject the shot
- 'decompress' happens (I read somewhere that this was to reduce pressure on the 'locking ring' of an internal valve)
- screw rotates packing in the plastic for the next shot, as it rotates a given amount of 'back pressure' (resistance against screw moving backwards, away from the mold) and the back pressure is what packs the plastic and promotes shearing to raise the temperature.
- carriage retracts
- clamp opens
- (in my case) Table rotates
- ejector is activated
The screens I have available to set all this up ...
The main screen:
550
Table, Clamp and Ejectors:
551
Not all these settings make sense to me but I was able to get it to clamp the mold (block of aluminum)
Inject and Carriage:
552
No idea if the numbers show are from the last time the machine ran (6-8 years ago) or random numbers.
A (small) piece of documentation I have says that "Primary and Secondary set points are for the fill portion of injection"
There is a manual valve setting on the rear of the machine to set the back pressure.
There is a manual valve setting on the front of the machine above the operator's panel to set the "Injection pressure".
Barrel Heat:
553
No idea if the numbers show are from the last time the machine ran or random numbers.
These were the settings I used to test the screw (rotated swiftly) and injection rams.
(continued on next post due to limit on pictures per post)
After getting it to clamp down on a block of aluminum I turned on the heaters and let it come up to temperature (~350) in all zones and manually tried screw rotation, carriage movement, etc. As far as I can tell all functions work.
Now I need to try to set it (Trueblood, 30-ton, screw-type) up to run ABS. I'm working slowly because I don't want to damage anything ... including me. I have only ever used a ram-type machine and this is a home shop/small business type environment at my home.
One resource I could use would be an online document that would cover the entire cycle from clamp to done but, especially the sequence of events during the injection cycle. I "assume" something like:
- (in my case) table rotates lower half of mold into place
- clamp closes and maintains clamping pressure
- carriage moves forward to press nozzle against mold.
- screw moves forward without turning to inject the shot
- 'decompress' happens (I read somewhere that this was to reduce pressure on the 'locking ring' of an internal valve)
- screw rotates packing in the plastic for the next shot, as it rotates a given amount of 'back pressure' (resistance against screw moving backwards, away from the mold) and the back pressure is what packs the plastic and promotes shearing to raise the temperature.
- carriage retracts
- clamp opens
- (in my case) Table rotates
- ejector is activated
The screens I have available to set all this up ...
The main screen:
550
Table, Clamp and Ejectors:
551
Not all these settings make sense to me but I was able to get it to clamp the mold (block of aluminum)
Inject and Carriage:
552
No idea if the numbers show are from the last time the machine ran (6-8 years ago) or random numbers.
A (small) piece of documentation I have says that "Primary and Secondary set points are for the fill portion of injection"
There is a manual valve setting on the rear of the machine to set the back pressure.
There is a manual valve setting on the front of the machine above the operator's panel to set the "Injection pressure".
Barrel Heat:
553
No idea if the numbers show are from the last time the machine ran or random numbers.
These were the settings I used to test the screw (rotated swiftly) and injection rams.
(continued on next post due to limit on pictures per post)