MP24

I worked on the core problem on the new cord dump mold in MP24 for a while last night. The problem we were having was with core pull in automatic sequence. After the cooling time, the cores would try to pull but only one would. We had to put the machine in manual cycle and wait. After about 30 to 45 seconds you could set the cores again then pull them. If you tried to just pull them, it wouldn't work. I checked the pressure on the set and pull side of the cores and it was reading around 2000psi. I verified that the set side pressure was dropping to zero before the pull side was energized. We then dry cycled the press without parts and the problem didn't occur. Since having parts in the mold was required to cause the problem, we tried decreasing the injection time. We had the injection time down fro 5 to 3.2 seconds. And even until the parts were short-shots and still no luck. We turned the front half of the mold down from 150 to 100 degrees and then tried increasing the cooling time from 12 to 30 seconds without any change.

Mark is going to try and turn the core pressure down to 1000psi to see if maybe the core or cylinder is sticking it the set position. The mold ran fine when it only had around 250 or 300psi on the cores but the core was being pushed back. I talked to Charlie on B shift and he said when he ran the sample run in MP17 he had the same problem with the core being pressed back but was able to process it out by decreasing his pack pressure. He said he only ran a couple hundred in single cycle though.

If turning the pressure down fixes the problem, we may have to take a closer look at the cylinders or whatever is causing the cores to stick so it will be able to run in other presses without modifying the pressure each time.

Collin