Inserts used in plastic parts provide a place for fasteners such as machine screws. The advantage of using inserts is that they are often made of brass and are robust. They allow for a great many cycles of assembly and disassembly. Inserts are installed in injection molded parts using one of...
To design a boss that will receive a threaded insert, use similar guidelines as above, using the diameter of the insert as the guiding dimension.*A threaded insert placed in a boss* __For best results:__ Avoid adding threads directly on your injection molded part Design bosses with an ...
Shrinkage– All injection-molded pieces will have some shrinkage. The amount of shrinkage will depend on several factors but will mostly come down to the type of material being used. Shrinkage will happen to every plastic injection molded part because plastic will contract as it cools. Some mater...
Injection Molding Design Guidelines Materials Design Processes Units Formulas Math injection molding Common Design Elements Rib Boss Counter bore/sink Inserts Self-Tapping Screws Snap Latches Living Hinge
Rapid injection molded parts that will be used in larger assemblies need to have correct and consistent dimensions so that parts fit together. Because some degree of dimensional variation is expected in any manufacturing process, you’ll need to define part tolerances. These allowable variations are...
Selection o the proper material or your molded parts is a critical decision. One must consider the mechanical properties, molding properties and cost o the resin they select or the given application. Application-speci c requirements will always drive the need or particular material properties,...
For injection molded parts with complex geometries at ridiculous speeds, create a Fictiv account and upload your part design today. Mold halves of an injection molding tool. The Critical Role of Tooling in Injection Molding Effective tooling design and selection significantly impact efficiency, cost, ...
where it prevents filling and causes other defects as well. The air can become so compressed that it ignites and burns the surrounding plastic material. To allow for removal of the molded part from the mold, the mold features must not overhang one another in the direction that the mold opens...
The basics of injection mold design An injection mold can be made using hardened or pre-hardened steel, aluminum, or a beryllium-copper alloy. It takes high levels of skill and experience to design an injection mold that can be used to produce thousands of quality products molded to a unifor...
Although this chapter concentrates on products made by the injection or compression molding process, readers should note that different parameters apply when the part is blow-molded or ther-moformed or made by any of the reinforced plastics molding processes. Wherever possible, this type of ...