The Car Parts Mould of temperature control system is composed of three parts: mold, mold temperature machine and heat conduction fluid. In order to ensure that heat can be added to or removed from the mold, each part of the system must meet the following conditions: firstly, in the mold, the surface area of the cooling channel must be large enough, and the diameter of the flow channel must match the pump capacity (pump pressure). The temperature distribution in the cavity has great influence on the deformation and internal pressure of parts. Reasonable setting of cooling channel can reduce the internal pressure and improve the quality of injection molded parts. It can also shorten cycle time and reduce product cost. Secondly, the mold temperature machine must be able to keep the temperature of the heat-conducting fluid constant in the range of 1℃-3℃, depending on the quality requirements of injection molded parts. Third, the heat conducting fluid must have good heat conducting ability, and it is important that it can lead in or lead out a large amount of heat in a short time. From a thermodynamic point of view, water is obviously better than oil.

It is also related to the time point in the injection cycle to control the temperature unevenness in the car parts mould. After injection, the temperature of the mold cavity rises, when the hot melt hits the cold wall of the mold cavity, and when the parts are removed, the temperature drops to a low level. The function of the mold temperature machine is to keep the temperature constant between θ2min and θ2max, that is to say, to prevent the temperature difference △θw from fluctuating up and down in the production process or gap. The following control methods are suitable for controlling mold temperature: controlling fluid temperature is a common method, and the control accuracy can meet the requirements of most cases.

Using this control method, the temperature displayed on the controller is not consistent with the mold temperature; The mold temperature fluctuates greatly, and the thermal factors affecting the mold are not directly measured and compensated, including the change of injection cycle, injection speed, melting temperature and room temperature. Secondly, direct control of mold temperature. In this method, a temperature sensor is installed inside the mold, which will be adopted only when the precision of mold temperature control is high. The main characteristics of mold temperature control include: the temperature set by the controller is consistent with the mold temperature; The thermal factors affecting the mold can be directly measured and compensated. Generally, the stability of mold temperature is better than that by controlling fluid temperature.

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