The temperature of the toy injection mould is not uniform and is related to the time point in the injection cycle. The role of the mold temperature machine is to keep the temperature constant between 2min and 2max, that is to prevent the temperature difference in the production process or gap fluctuation. The following control methods apply to controlling the temperature of the mold: the control of fluid temperature is the most commonly used method, toy injection mould and the control accuracy can meet most of the requirements. Using this control method, the temperature of the controller is not consistent with the mold temperature; the mold temperature fluctuates considerably because the thermal factors that affect the mold are not directly measured and compensated. These factors include changes in injection cycle, injection speed, melting temperature and Room temperature.
Followed by the mold temperature is the direct control. The method is to install the temperature inside the mold temperature sensor, which in the mold temperature control accuracy requirements are relatively high will be used. The main features of the mold temperature control include: the temperature set by the controller is consistent with the mold temperature; the thermal factors that affect the mold can be measured and compensated directly. toy injection mould Normally, the mold temperature is better than the temperature through the control fluid. In addition, mold temperature control in the production process control in the repeatability is better. The third is joint control. Joint control is a combination of the above methods, which can simultaneously control the temperature of the fluid and mold. In the joint control, the temperature sensor in the mold position is extremely important, place the temperature sensor, you must consider the shape, structure and cooling channel location. In addition, the temperature sensor should be placed in the quality of the injection of a decisive role in the place. There are many ways to connect one or more mold temperature machines to the injection molding machine controller. The use of digital interfaces is best considered from operational, reliability and interference immunity.
The thermal balance of the injection molds is the key to the production of injection molded parts. Inside the mold, the heat from plastic (such as thermoplastics) is transferred to the material and mold steel by heat radiation and convected to the heat transfer fluid. In addition, heat is transferred to the atmosphere and mold through heat radiation. Heat absorbed by the heat transfer fluid is removed by the mold temperature machine. toy injection mould The thermal balance of the mold can be described as: P = Pm-Ps. Where P is the heat that is taken by the mold temperature machine; Pm is the heat introduced by the plastic; Ps is the heat that the mold emits to the atmosphere.
The purpose of controlling the temperature of the mold and the temperature of the mold on the injection molding The main purpose of controlling the mold temperature in the injection molding process is to heat the mold to the working temperature and the other to keep the mold temperature constant at the working temperature. The above two points to do the success of the time, you can optimize the cycle time, and thus ensure the stability of high-quality injection molding.
Mold temperature will affect the surface quality, mobility, shrinkage, injection cycle and deformation, and several aspects. Mold temperature is too high or insufficient for different materials will have different effects. For thermoplastics, the higher mold temperature usually improves surface quality and fluidity, but extends the cooling time and injection cycle. Lower mold temperature will reduce the shrinkage in the mold, but will increase the shrinkage of molded parts after stripping. For thermosetting plastics, toy injection mould the higher mold temperature usually reduces the cycle time and the time is determined by the time required for the parts to cool. In addition, in the plastic processing, the higher the mold temperature will reduce the plasticizing time, reduce the number of cycles.