NADCA Video News & Information
The material presented in this video are some highlights from NADCA’s online webinar - Mechanical Maintenance & Evaluation of Die Cast Machines: Die Casting Machine Primary Mechanical Structures. The first in the Mechanical Maintenance & Evaluation of Die Cast Machines series covers topics related to the major mechanical support structures of die casting machines; the machine base, rails, platen supports, wear pads, die carriers, tie bars and bushings.
What about this foundation business? Let's start from the bottom and work up. This foundation is extremely important, just like it is for a house or any other very large or heavy object. For example, an 800-ton die casting machine weighs about a hundred thousand pounds or 50 tons. So that's pretty heavy. So we need to do something. We can't just plop this machine down on any surface and expect it to perform the way it's supposed to or the way it was designed to be performing. So, machines themselves are not very rigid or able to support their own weight. Let's say if you put them on an uneven surface, they very easily can twist, distort, bend and bow. They're fairly elastic constructs. And so what we have to do is provide some kind of foundation that gives us a good, solid, relatively rigid and stable support.
Furthermore, we just can't deal with the static weight of the machine. We have to realize that the machines move and, in fact, they move relatively quickly for their mass. And so, platforms come to an abrupt halt when they're opened or when they're closed. There's a lot of motion and impact when the shot is made. The point is that the foundation underneath the machine has to be able to deal with these dynamic loads as well, which can maybe increase the static rate of the machine load on the foundation by 10 to 20%, sometimes depending on the machine and how big it is and how fast it moves. The other thing is the machines have motors, pumps, and all kinds of related equipment on it.
And so vibrations occur, which are translated down into the foundation and hopefully we have a way of dealing with those vibration problems as well. Then, because of these dynamic movements, the machines needs to be affixed to the foundation so it can't slide or move around. And so we'll look at those things too. And finally, let's face it, things come out of the machine: lubricants that lubricate the moving parts to the machine, greases, oils, things of nature. Furthermore, the effluent from spraying the die liquid--water based fluids, et cetera--will drip down under the machine. And if you don't accommodate for those fluids to drain out from under there, you get a big mess underneath the machine.
For information on purchasing a downloadable copy of this webinar in its entirety, please visit: http://www.diecasting.org/store/detail.aspx?id=WEB239
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