Tricks of the Trade on RTOs,RSOs

摘要

They have a lot more to offer than shutting off a cavity.Let's take a look at what else they can provide.Most people think runner shutoffs(RSOs)are needed only for family molds.That's not true.Many people use them in dedicated high-cavitation molds.Let's say you have a four- or eight-cavity mold,and one of the cavities has a problem.Sometimes it's advantageous to be able to quickly and temporarily block off that cavity—in the press—and continue molding.Your profit margin just dropped by 12% to 25%,but you are still able to fulfill a promised delivery date to your customer.I cannot stress how important it is in this situation to have the mold repaired at the end of the production run,so as not to have a cavity blocked off at the start of the next run.In addition to the loss of profit margin and extended time to make the production quantity,you also expose yourself to potential mold damage.Most molders have a process setup sheet for every mold.That sheet is based on using all the cavities in the mold.So,what happens when you dial in the shot size for eight cavities,but only six or seven are open? Flash,overpacked parts stuck in the cavity,broken ejector pins,or a cracked cavity insert are just a few of the problems you might encounter when you accidentally mold a "pancake."