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Application of mold temperature machine in injection mold
Abstract: The mold temperature control machine (referred to as the mold temperature machine), there are basically two types on the market, one is water as the medium, and the other is the heat conduction oil as the medium. The difference between these two mold temperature machines, water as the medium (referred to as water temperature machine or water mold temperature machine) has the advantages of (1) no pollution. (2) Low operating costs, almost no money to buy media. (3) The rate of temperature rise is fast. The advantage of using heat-conducting oil as the medium (referred to as oil temperature machine or oil type mold temperature machine) is that (1) it is safer to operate at low pressure under high temperature conditions. (2) It can reach a larger temperature control range than the water mold temperature machine. The function of the mold temperature machine is to heat the mold temperature or cool to lower the mold temperature and reach a reasonable temperature and control the injection temperature to ensure the quality of the injection molded parts and optimize the processing time. In the injection molding industry, the temperature of the mold plays a decisive role in the quality of the injection molded part and the injection time. This article will explain the application points of the mold temperature machine in the injection mold from the following seven aspects: the heat balance of the injection mold; the purpose of controlling the mold temperature and the influence of the mold temperature on the injection molded parts; the preliminary conditions for effectively controlling the mold temperature; the mold temperature machine; Fluid; the advantages and economics of the mold temperature machine. Http:// Contact: Zhang Wanli Mobile 1, thermal balance of injection mold control The heat transfer of injection molding machine and mold is the key to the production of injection molded parts. Inside the mold, heat from plastics (such as thermoplastics) is transferred to the steel of the material and the mold by heat radiation, and is transferred to the heat transfer fluid by convection. In addition, heat is transferred to the atmosphere and the formwork by thermal radiation. The heat absorbed by the heat transfer fluid is carried away by the mold temperature machine. The heat balance 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 that the mold emits to the atmosphere. 2. 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. 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, higher mold temperatures generally improve surface quality and flow, but extend cooling time and injection cycle times. A lower mold temperature will reduce shrinkage in the mold, but will increase the shrinkage of the molded part after demolding. For thermoset plastics, a higher mold temperature typically reduces cycle time, and the time is determined by the time required to cool the part. In addition, in the processing of plastics, a higher mold temperature will also reduce the plasticizing time and reduce the number of cycles.