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What is the effect of mold temperature on injection molded parts?

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The configuration of the injection mold temperature machine and the configuration of the mold temperature machine should be comprehensively determined according to the processed material, the weight of the mold, the required preheating time and productivity. When using heat transfer oil, the operator must abide by such safety regulations: do not place the mold temperature machine near the heat source furnace; The joint uses tapered leak-proof and temperature-resistant hose or hard pipe. Regularly check the temperature control circuit mold temperature machine, whether the joint and mold leak or not, and whether the function is normal; Regularly replace the heat transfer oil; Synthetic oil should be selected, with good thermal stability and low coking tendency.

Injection mold temperature machine is to control the temperature of the mold is not uniform, but also related to the time point in the injection cycle. After injection, the temperature of the mold cavity rises to * * *, when the hot melt hits the cold wall of the mold cavity, and when the part is removed, the temperature drops * * *. The role of the mold temperature machine is to keep the temperature constant between θ2min and θ2max, that is, to prevent the temperature difference from fluctuating up and down in the production process or gap. Several control methods are suitable for controlling the temperature of the mold: controlling the fluid temperature is the most commonly used method, and the control accuracy can meet the requirements of most situations. Mold temperature machine manufacturers use this control method to show that the temperature in the controller and the mold temperature are not consistent; the temperature fluctuation of the mold is quite large, because the thermal factors affecting the mold are not directly measured and compensated for these factors including the change of injection cycle, injection speed, melting temperature and room temperature. The second is the direct control of mold temperature.

The preparation condition temperature control system for effective control of mold temperature consists of three parts: mold, injection mold temperature machine and heat conduction fluid. In order to ensure that heat can be added to the mold or removed, all parts of the system must meet the following conditions: First, inside the mold, the surface area of the cooling channel must be large enough, and the diameter of the runner must match the capacity of the pump (pump pressure). The temperature distribution in the cavity has a great influence on the part deformation and internal pressure. Reasonable setting of cooling channels can reduce the internal pressure, thereby improving the quality of injection molded parts. It can also shorten the cycle time and reduce the cost of the product. Secondly, the mold temperature machine must be able to make the temperature of the heat transfer fluid constant in the range of 1 ℃-3 ℃, according to the quality requirements of the injection molded parts. The third is that the thermal fluid must have good thermal conductivity, and most importantly, it must be able to import or export a large amount of heat in a short time. From a thermodynamic point of view, water is clearly better than oil.

The purpose of controlling the mold temperature and the influence of the mold temperature on the injection molding process, the main purpose of controlling the mold temperature is to heat the mold to the working temperature, and the second is to keep the mold temperature constant at the working temperature. If the above two points are successful, the cycle time can be * * *, thus ensuring the stable high quality of injection molded parts. Mold temperature will affect the surface quality, fluidity, shrinkage, injection cycle and deformation and other aspects. Too high or insufficient mold temperature will have different effects on different materials. For thermoplastics, a higher mold temperature will usually improve the surface quality and fluidity, but will extend the cooling time and mold temperature machine price injection cycle.