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Make a Mold for Plastic Injection

Plastic injection mold technology introduction

The basic structure of an injection mold is composed of two parts: a fixed mold and a movable mold. The fixed mold part is installed on the fixed plate of the injection molding machine, and the movable mold part is installed on the moving plate of the injection molding machine. During injection molding, the fixed mold part and the hydraulically driven movable mold part are guided by the guide post to close, and the plastic melt enters the cavity from the injection molding machine nozzle through the mold casting system; after the injection molding is cooled, the mold opens, namely the fixed mold and the movable mold Separate, under normal circumstances, the plastic part is left on the movable mold, and the mold ejection mechanism pushes the plastic part out of the mold-DIY injection molding.

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How to make injection molds?

1- Standard CNC machining is a traditional form, and standard machining requires manual use of lathes, milling machines and drilling machines. With advanced technology, CNC machining has become the main means of manufacturing more complex and accurate molds, while still using standard machining methods. With CNC, computers can be used to control the movement and operation of milling machines, lathes and other cutting machines.

In modern CNC systems, mold design and manufacturing processes are highly automated. Use computer-aided design (CAD) software to define the mechanical dimensions of the mold, and then use computer-aided manufacturing (CAM) software to convert it into manufacturing instructions. The "post processor" software then converts these instructions into specific commands required by each machine used to create the mold. Then load the generated commands into the CNC machine tool.

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2- Electrical discharge machining (EDM) has been widely used in mold manufacturing. EDM is a process to obtain a desired shape by using electrodes made of graphite or copper. Then install it in the EDM machine and place it above the workpiece immersed in the insulating liquid.

Then lower the electrode onto the workpiece. Then, using a controlled power source, the electrode is used to destroy and disperse the metal in the area opposite to the electrode. The electrode never touches the workpiece. A spark gap of a few thousandths of an inch is always maintained between the electrode and the workpiece. This process is a slower method of removing metal from the mold. However, the EDM process can produce shapes that traditional CNC machining cannot achieve.

Another advantage of the EDM process is that it can form pre-hardened molds and does not require additional heat treatment. Sometimes, such as in speaker grille molds, the resulting fine EDM finishing can be used as the finishing of the final part without any polishing of the cavity.





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