Abstract: The die temperature control machine is referred to as the die temperature machine. There are basically two types on the market. One is using water as the media, and the other is using the thermal oil as the media. The difference between these two kinds of mold temperature machine, using water as a medium (referred to as the water temperature machine or water mold temperature machine) has the advantages of (1) no pollution. (2) Low operating costs Hardly spend money on media. (3) The reaction rate of heating is fast. The advantages of using heat-conducting oil as a medium (referred to as the oil temperature machine or the oil-type mold temperature machine) are as follows: (1) The low-pressure operation state is safe under high temperature conditions. (2) A larger temperature control range than that of a water-type mold temperature controller can be achieved. The function of the mold temperature machine is to increase the temperature of the mold by heating or cooling to reduce the mold temperature and reach a reasonable temperature and control the injection temperature, to ensure the stability of the quality of the injection molded parts and optimize the processing time. In the injection molding industry, the temperature of the mold has a decisive effect on the quality of the injection molded part and the injection time. This article will explain the application points of the mold warmer in the injection mold from the following seven aspects: the thermal balance of the injection mold; the purpose of controlling the mold temperature and the temperature of the mold on the injection molded parts
Influence; precondition for effective control of mold temperature; mold temperature machine; heat transfer fluid; advantage and economy of mold temperature machine.
1. Thermal balance of injection mold control The heat transfer of injection molding machines and molds is the key to producing injection molded parts. Inside the mold, heat from plastics (such as thermoplastics) is transferred by heat radiation to the steel of the Material and the mold, and is transmitted to the heat transfer fluid by convection. In addition, heat is transferred to the atmosphere and the mold frame by thermal radiation. The heat absorbed by the heat transfer fluid is taken away by the mold warmer. The heat balance of the mold can be described as: P=Pm-Ps. In the formula, P is the heat taken away by the mold temperature machine; Pm is the heat introduced by the plastic; Ps is the heat that the mold disperses to the atmosphere.
2. The purpose of controlling the temperature of the mold and the influence of the temperature of the mold on the injection molded part In the injection molding process, the main purpose of controlling the temperature of the mold 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 injection molded parts. Mold temperature affects surface quality, fluidity, shrinkage, injection cycle, and deformation. Excessive or insufficient mold temperature can have different effects on different materials. For thermoplastics, a higher die temperature generally improves surface quality and flow but increases the cooling time and injection cycle. A lower mold temperature will reduce shrinkage in the mold, but will increase the shrinkage of the molded part after demoulding. For thermosetting plastics, a higher mold temperature usually reduces the cycle time, which is determined by the time required for the part to cool. In addition, in the plastic processing, a higher mold temperature will also reduce the plasticization time and reduce the number of cycles.
3, preparatory conditions for effective control of the mold temperature The temperature control system consists of three parts: mold, mold temperature, and heat transfer fluid. In order to ensure that the 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 to match the pump's capacity (pump pressure). The temperature distribution in the cavity has a great influence on the part deformation and the internal pressure. Properly setting the cooling channels can reduce the internal pressure and improve the quality of the injection molded parts. It also reduces cycle times and reduces product costs. Followed by the mold temperature machine must be able to make the temperature of the heat transfer fluid constant within the range of 1 °C -3 °C, according to the quality requirements of the injection molded parts. The third is that the heat transfer fluid must have good thermal conductivity, and most importantly, it must be able to introduce or export a large amount of heat in a short time. From a thermodynamic point of view, water is significantly better than oil.
Influence; precondition for effective control of mold temperature; mold temperature machine; heat transfer fluid; advantage and economy of mold temperature machine.
1. Thermal balance of injection mold control The heat transfer of injection molding machines and molds is the key to producing injection molded parts. Inside the mold, heat from plastics (such as thermoplastics) is transferred by heat radiation to the steel of the Material and the mold, and is transmitted to the heat transfer fluid by convection. In addition, heat is transferred to the atmosphere and the mold frame by thermal radiation. The heat absorbed by the heat transfer fluid is taken away by the mold warmer. The heat balance of the mold can be described as: P=Pm-Ps. In the formula, P is the heat taken away by the mold temperature machine; Pm is the heat introduced by the plastic; Ps is the heat that the mold disperses to the atmosphere.
2. The purpose of controlling the temperature of the mold and the influence of the temperature of the mold on the injection molded part In the injection molding process, the main purpose of controlling the temperature of the mold 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 injection molded parts. Mold temperature affects surface quality, fluidity, shrinkage, injection cycle, and deformation. Excessive or insufficient mold temperature can have different effects on different materials. For thermoplastics, a higher die temperature generally improves surface quality and flow but increases the cooling time and injection cycle. A lower mold temperature will reduce shrinkage in the mold, but will increase the shrinkage of the molded part after demoulding. For thermosetting plastics, a higher mold temperature usually reduces the cycle time, which is determined by the time required for the part to cool. In addition, in the plastic processing, a higher mold temperature will also reduce the plasticization time and reduce the number of cycles.
3, preparatory conditions for effective control of the mold temperature The temperature control system consists of three parts: mold, mold temperature, and heat transfer fluid. In order to ensure that the 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 to match the pump's capacity (pump pressure). The temperature distribution in the cavity has a great influence on the part deformation and the internal pressure. Properly setting the cooling channels can reduce the internal pressure and improve the quality of the injection molded parts. It also reduces cycle times and reduces product costs. Followed by the mold temperature machine must be able to make the temperature of the heat transfer fluid constant within the range of 1 °C -3 °C, according to the quality requirements of the injection molded parts. The third is that the heat transfer fluid must have good thermal conductivity, and most importantly, it must be able to introduce or export a large amount of heat in a short time. From a thermodynamic point of view, water is significantly better than oil.
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