The five major control parameters of the injection molding machine-pressure, speed, position, time, and temperature all have an effect on the weight change. In the case of continuous production without changing parameters, the temperature that has the greatest impact on the weight stability of the product.
1. Temperature and purity of hydraulic oil. The temperature of the hydraulic oil directly affects the viscosity of the oil and affects the control pressure and speed, especially when the equipment is not fully closed-loop controlled. When the purity is low, it may block the flow valve of each proportional valve. Therefore, hydraulic oil will affect the weight stability. The main factor affecting the oil temperature is the efficiency of the oil temperature cooler, so pay attention to the hardness and cleanliness of the external circulating water. If the hardness is high, the cleanliness is poor, the efficiency of the cooler must be poor, and the increase in oil temperature is inevitable.
2. Mold temperature, especially the temperature of the cavity surface. This depends on two points, the stability of the molding cycle and the stability of the cooling water. The cooling water flow is large and the cooling effect is good. The hardness is low and the water path is not blocked.
3. Stability of barrel temperature and flow. The temperature stability is mainly due to reasonable back pressure, and there should not be excessive shear heating, but the back pressure is generally less than 30kg barrel