Two stage ejector mould10/31/2022 ![]() The molding machine should be able to sense the amount of force it takes to actuate the ejection system. As part of this process, you can use the molding machine settings to predict the wear. The second step is maintaining the mold properly over time. If the ejector pin holes are damaged, they may even need to be welded or machined to increase the pin size.Įnsuring the proper function of the ejection system when the mold is built is the first step to preventing these issues. In either case, the pin will need to be removed, and any damage will need to be repaired. So why is this a big deal? Once an ejection system has tied up, the pin may bend or break inside the tooling. Misalignment and Clearance Issues – Having a misaligned ejection system or having ejector pins that do no float properly can cause the pin to gull up and lock into the tooling. Rust – If tooling sits for an extended amount of time without proper rust preventative measures, the ejection system can build up rust. Not properly disassembling and cleaning tooling is the leading cause of pin lockup. Poor Maintenance Practices – This often comes with running molding materials that create a lot of gas. A few circumstances can cause gulling and lockup: Not only can pins wear, they can also begin to tie up due to the gulling of the pin against the tooling surface. However, if there are no underlying issues, fixing ejector pin and hole wear is accomplished in one of two ways-welding and reworking the area or increasing the size of the pin and hole. More wear requires more invasive and costly repair work. This is why it’s essential to address the issues as early as possible. You might have a misaligned ejection system, rust, or lack of clearance in the ejection system. For worn ejector pins, the problem may be deeper than simple wear. This allows you to address the actual problem, not just a symptom of the problem. Like most repair work, it’s important to first understand why something happened. That wear can show through as flashing around the pin (since plastic can flow into the wear area). Since ejection systems cycle back and forth on each molding cycle, the guide hole in the tooling surface or the pin itself can wear over time. The ejection system and pins are then advanced, ejecting the part from the molding surface. ![]() During the molding process, the ejection system is retracted back so that the ejector pins are flush with the surface of the tooling. Ejector Pin and Hole WearĮjector pins (also known as knockouts) are located across the surface of the part. ![]() #TWO STAGE EJECTOR MOULD HOW TO#In this article, we are going to discuss the common failure points for ejection systems, how to prevent them, and how to fix them when they fail. Because mold ejection systems move at least once on every cycle of the mold they become a potential wear area for long service life tooling. ![]()
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