Injection molding process is the main process of MIM technology, which can be divided into the following main steps :

① Feeding process

Before injection molding begins, the screw speed and the pressure in the barrel are fixed, the mold is closed, and the ejector rod is shrunk.

After the injection starts, the nozzle is close to the flow path, and the screw is pushed forward. At this time, the lock ring at the front end of the screw is closed to ensure that the feeding cylinder is extruded and the mold cavity is filled after the feeding is compressed. When the front end of the barrel has enough feed to fill the mold cavity, the screw stops rotating.

② Glue and injection

The feed is heated to a certain temperature in the barrel before melting and then filling the mold.

③ pressure control

When the screw reaches the top nozzle, the process of putting pressure on the feed is called the pressure holding process, which is a stage in the mold where the feed is controlled by the machine. When the pressure in the mold cavity increases, the flow rate of the feed decreases. When the feed is cooled, the mold filling process is over.

④ Demould

One step in injection molding is to remove the forming blank from the mold, a process called demoulding.