MoldMaking Technology

DEC 2018

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moldmakingtechnology.com 29 The ejector plate here is nearly coupled. As the barb is inserted into the coupler, it will reach a point where the collar on the outside of the coupler will click forward, creating a solid connection. to hold the ejection system in the back position, and spring pressure must be more than the pressure that is required to activate the couplers. However, the real question is: How does someone use a coupler? Cardinale decided to use the coupler in a very specific way. He took ejector bars from Arburg and contracted a tool- maker to manufacture small adapters that could fit the half 13 thread of the coupler, adapting the coupler to the ejec- tor plate of the press. He then modified the ejector bars on This coupler is designed to provide a quick method of attaching the ejector plate in the mold to the ejection system in the molding machine. It also provides positive ejector plate return while greatly reducing setup time. This coupler is suited for molding machines where the ejector plate on the machine is difficult to reach and is ideal to use when center ejection is desired but impossible to tie-in. This shows the coupler prior to bringing the ejector plate forward. used a regular bolt with a spring to accommodate the flex. It was very time-consuming and labor-intensive. Eventually, the team invested in a next-generation Arburg molding machine on which operators could load diskettes for all their information. "It was a little computer. All of your movements (injection, nozzle, ejector, clamp) were done within encoded positions, allowing you to create zero positions," Cardinale says. "But, I was fed up with these cou- plers because I still had to put on ejector bars. So, I started researching online and found couplers from Alba." This coupler is unique because when the operator puts the barb into the coupler, there is a little bit of a spring-loaded flex, which takes a lot of load off of the machine so that nothing gets snapped. It is that little bit of machining space that provides a necessary buffer. This helped eliminate any manually adjusted coupler breakage and required no thread- ing, turning or lock screws. "You just bring it forward, click, bring it back, and you are done," Cardinale says. The Beauty of the Coupler Now, the purpose of a coupler is to have a faster, more reli- able method for tying positive-return ejection into the mold. Positive-return ejection requires some form of spring force

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