Automatic portable plastic injection machine

An injection molding machine comprising:

• a frame to engageably receive a replaceable two-piece core mold;
• a motorized clamp assembly that selectively opens and clamps shut the two-piece cavity mold;
• an electrically-controlled injection valve in fluid communication with an interior cavity defined by the two-piece mold;
• heated cylinder barrel having one end in communication with the interior cavity of the two-piece mold via the injection valve;
• a motorized pre-plasticizing assembly that selectively feeds solid thermoplastic material into the heated cylinder barrel;
• a injection assembly comprising:
• (i) a plunger that is received for movement in another end of the heated cylinder barrel;
• (ii) a spring biasing the plunger toward the heated cylinder barrel;
• and (iii) an injection motor that selects moves the spring between an unbiased home position and a biased forward position to impart potential energy in the spring;
• and
• a controller in electrical communication with the motorized clamp assembly, the heated cylinder barrel, the motorized pre-plasticizing assembly, and the injection assembly and that executes an application that configures the controller to:
• feed thermoplastic material into a heated cylinder barrel that is closed at one end by an injection valve;
• warm the heated cylinder barrel to thermoplastic material to a liquid state;
• actuate an injection motor to preload a spring biased plunger received within another end of the heated cylinder barrel, thereby pressurizing liquid thermoplastic material in the heating cylinder barrel to an injection pressure set value;
• actuate an injection valve motor to open the injection valve causing the pressurized liquid thermoplastic material to inject into a clamped mold;
• and
• release a portion of the clamped mold to release the molded article.