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What are the functional characteristics of injection mold processing


Shanghai injection manufacturer

不 The temperature in the injection mold is uneven at various points, which is also related to the time point in the injection cycle. The function of the mold temperature machine is to keep the temperature constant between 2min and 2max, that is to prevent the temperature difference from fluctuating up and down in the production process or the gap. The following control methods are suitable for controlling the temperature of the mold: controlling the temperature of the fluid is the most commonly used method, and the control accuracy can meet the requirements of most situations. Using this control method, it is shown that the temperature of 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 changes in injection cycle, injection speed, melting temperature and Room temperature. The second is the direct control of the mold temperature. This method is to install a temperature sensor inside the mold, which will be used only when the mold temperature control accuracy is relatively high. The main features 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. In general, mold temperature stability is better than by controlling fluid temperature. In addition, mold temperature control has better repeatability in production process control.

The third is joint control. Joint control is a combination of the above methods, which can control the temperature of the fluid and the mold at the same time. In joint control, the position of the temperature sensor in the mold is extremely important. When placing the temperature sensor, the shape, structure, and location of the cooling channel must be considered. In addition, the temperature sensor should be placed where the quality of the injection molded part is decisive. There are many ways to connect one or more mold temperature machines to the injection molding machine controller. Use digital interface for operability, reliability and anti-interference.

的 Control of heat balance in injection mold processing The heat conduction of injection molding machine and mold is the key to the production of injection molded parts. Inside the mold, the heat brought by plastic (such as thermoplastic) from the Shanghai injection molding manufacturer is transferred to the material and the steel of the mold through thermal radiation, and is transferred to the heat-conducting fluid through convection. In addition, heat is transferred to the atmosphere and the mold base through thermal radiation. The heat absorbed by the heat transfer fluid is taken away by the mold temperature machine. The thermal equilibrium of the mold can be described as: P = Pm-Ps. Where P is the heat taken away by the mold temperature machine; Pm is the heat introduced by the plastic; Ps is the heat emitted from the mold to the atmosphere. The purpose of controlling the mold temperature and the influence of the mold temperature on the injection molded part In 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 optimized to ensure the stable high quality of the injection molded parts.

The processing temperature of injection mold will affect the surface quality, fluidity, shrinkage, injection cycle and deformation. Excessive or insufficient mold temperature will have different effects on different materials. For thermoplastics, higher mold temperatures usually improve surface quality and fluidity, but extend cooling times and injection cycles. A lower mold temperature will reduce the shrinkage in the mold, but will increase the shrinkage of the injection molded part after demolding. For thermoset plastics, a higher mold temperature usually reduces cycle time, and the time is determined by the time required for the part to cool. In addition, in the processing of plastics, a higher mold temperature will reduce the plasticization time and reduce the number of cycles.

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Contact person: General Teng

Company phone: 021-67890578

Company address: No. 8 Workshop, No. 601 Xiangmin Road, Chedun Town, Songjiang District, Shanghai


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