When the liquid die forging machine is trial molded, first preheat the mold to the appropriate temperature, and then inject the prepared liquid metal into the mold cavity. Start the equipment to apply pressure, maintain pressure and other operations according to the set parameters, and observe the metal flow and forming. After the trial mold is completed, carefully check the status of the mold and the molded part, adjust the process parameters according to the results, and prepare for formal production.