试模前必须对设备的油路、水路及电路进行检查，并按规定保养设备，作好开车

Before testing the mold, you must check the oil circuit, water circuit and circuit of the equipment, and maintain the equipment according to the regulations and make preparations before starting the drive. <br>① Preheating of the <br>mold There are roughly two methods of preheating the mold: One is to use the cooling water holes of the mold itself to pass hot water for heating. The second is the external heating method, that is, the cast aluminum heating plate is installed outside the mold and heated from the outside to the inside. This method heats quickly, but the consumption is large. For small and medium-sized molds, no mold preheating is required. <br>② Heating of the barrel and nozzle The barrel and nozzle are heated <br>according to the process parameters recommended in the process manual, which is performed simultaneously with the preheating of the mold. <br>③ The selection and adjustment <br>of process parameters are based on the preliminary selection of temperature, pressure and time parameters of the process parameters recommended in the process manual. The adjustment of the process parameters is based on the order of pressure, time and temperature. <br>④ Test injection <br>When the plastic and mold in the barrel reach the preheating temperature, you can perform test injection, observe the quality defects of the injection molded plastic parts, analyze the causes of the defects, adjust the process parameters and other technical parameters until they reach the best state.

Before the test model must be the equipment of the oil, waterway and circuit inspection, and in accordance with the provisions of maintenance equipment, ready to drive.<br>(1) Mold preheating<br> There are two kinds of mold preheating methods: One is to use the cooling water hole of the mold itself, through hot water for heating. The second is the external heating method, the cast aluminum heating plate is installed outside the mold, from the outside of the heating, this method heating fast, but the consumption is large. For small and medium-sized molds, there is no need to preheat the mold.<br>(2) Heating of barrels and nozzles<br>The barrel and nozzle are heated according to the process parameters recommended in the process manual, and the mold is warmed up at the same time.<br>(3) Selection and adjustment of process parameters<br>According to the process parameters recommended in the process manual, the temperature, pressure and time parameters are initially used, the adjustment process parameters are in order of pressure, time, temperature and so on.<br>(4) Trial injection molding<br>When the plastic and mold in the barrel reach the preheating temperature, it is possible to test-injection molding, observe the quality defects of injection molding parts, analyze the causes of defects, adjust process parameters and other technical parameters until the best condition is reached.

Before the mold test, the oil circuit, water circuit and circuit of the equipment must be checked, and the equipment shall be maintained according to the regulations, and the preparation before the start-up shall be made.<br>① Mold preheating<br>There are two ways to preheat the mould: one is to use the cooling water hole of the mould itself to heat it with hot water. The second is the external heating method, that is, the cast aluminum heating plate is installed on the outside of the mold, and is heated from the outside to the inside. This method is fast in heating, but it consumes a lot of energy. For small and medium-sized dies, preheating is not necessary.<br>② Heating of barrel and nozzle<br>According to the process parameters recommended in the process manual, the barrel and nozzle are heated simultaneously with the mold preheating.<br>③ Selection and adjustment of process parameters<br>According to the recommended process parameters in the process manual, the temperature, pressure and time parameters are preliminarily selected, and the process parameters are adjusted in the order of pressure, time and temperature.<br>④ Trial injection<br>When the plastic and mold in the barrel reach the preheating temperature, trial injection can be carried out to observe the quality defects of the injection molded parts, analyze the causes of the defects, adjust the process parameters and other technical parameters until reaching the best state.<br>