plastic composite granules into the plastic injection molding machine the technical parameters for manufacturing the injection molded product include a first stage temperature of 250 u00b0 c a second stage temperature of 260 u00b0 c a third stage temperature of 270 u00b0 c a fourth stage temperature of 280 u00b0 c a nozzle temperature of 275 u00b0 c and a mold temperature of 140 u00b0 c the product manufactured according to the aforementioned composition and technique has a density of 1 82 g cm 3 a tensile strength of 75 mpa an izod impact strength of 132 j m and a thermal deformation temperature of 172 u00b0 c and the product comes with a high surface luster and free of pitting and wavy lines the composition of the imitation metal engineering plastic composite material of this embodiment includes 6 3 by weight of polycaprolactam 15 by weight of polyhexamethylene adipamide 7 5 by weight of a maleic anhydride grafted ethylene octene copolymer 55 by weight of an iron powder 15 by weight of a glass fiber 0 5 by weight of a coupling agent 0 2 by weight of antioxidant 1010 and 0 1 by weight of antioxidant 168 step 1 weigh an iron powder according to the weight percentage add the iron powder into a high speed mixing machine stir the iron powder at a rotating speed of 1000 rpm for 20 u02dc 60 minutes and dry the iron powder to a temperature up to 120 u00b0 c step 2 weigh a coupling agent according to the weight percentage and spray the coupling agent uniformly onto the stirring iron powder step 3 keep stirring at a high rotating speed of 2000.