Locating ring injection mold is simple part but, very important when mold base attach to injection machine. It use to locate or align sprue of mold and nozzle of injection machine. It is usually in center of mold. Sometimes, it is offset to reduce mold side.
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I. Locating ring injection design.
1. Dimension.
+ Locating ring of mold will assemble with hole of fix plate of injection machine. When design locating ring, first rule is look at your injection machine catalog or hand book, and find the dimension of locating ring. If dimension of locating is bigger or smaller than dimension of hold on fix plate, this mold can not assemble on the injection machine.
+ Dimension of each machine is different, and hole dimension of fix plate is usually ~100~300 mm. You can reference dimension at table below. This is data of CLF- factory (Taiwan)
from picture above we know that locating ring diameter is 100~250 mm , so your locating ring outer diameter must same with those injection machine locating ring hole.
+ Injection machine tolerance always about minus 0.01-0.1 mm, then the locating ring tolerance if we buy in standard mold part company is about minus 0.01-0.05.
You can refer dimension of some locating of Mitsumi factory.
2. Structure of locating ring injection molding.
+ Material of locating ring usually is C45 for normal function, It can be different if you have special order.
+ There are 2 main locating ring construction are type A and type B
+ We have each assembly method for each type of locating ring. You can refer this picture below for assembly method.
+ If we have to design a mold for two injection machine which dimension of locating ring are different. Step locating is the best choose. You can change the direction of locating ring when change the injection machine.
+ Locating ring can assemble with sprue bush by free or tight.
Thank for reading.
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