The role of Dongguan mold warming machine:
Dongguan mold temperature machine is divided into two types: water type mold temperature machine and oil type mold temperature machine. The mold temperature machine is used to adjust the balance mold temperature, which can be used to raise or lower the temperature. The mold temperature machine utilizes heat transfer media with high thermal conductivity to send excess heat away from the mold in a very short time. After setting the heat balance temperature, it can automatically control its temperature within a minimum error and maintain a constant value. After setting the heat balance temperature, it can automatically control its temperature within a minimum error and maintain a constant value.
The role of a mold temperature machine is to heat the mold and maintain its operating temperature, ensure stable quality of injection molded parts, and optimize processing time. In the injection molding industry, mold temperature plays a decisive role in the quality and injection time of injection molded parts.
1. Thermal balance control of injection molding machines and heat conduction of molds are the key to producing injection molded parts. Inside the mold, the heat brought by plastics (such as thermoplastics) is transferred to the material and mold steel through thermal radiation, and to the thermally conductive fluid through convection. In addition, heat is transferred to the atmosphere and mold base through thermal radiation. The heat absorbed by the heat conducting fluid is taken away by the mold thermostat.
2. The purpose of controlling mold temperature and the impact of mold temperature on injection molded parts In injection molding processes, the main purpose of controlling mold temperature is to heat the mold to operating temperature, and to maintain the mold temperature constant at operating temperature. If the above two points are successful, the cycle time can be optimized to ensure stable and high-quality injection molded parts. Mold temperature can affect 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 typically improve surface quality and fluidity, but extend cooling time and injection molding cycles. A lower mold temperature will reduce the shrinkage within the mold, but will increase the shrinkage of the molded part after demolding. For thermosetting plastics, higher mold temperatures typically reduce cycle time, and the time is determined by the time required for the part to cool. In addition, in the processing of plastics, higher mold temperatures will also reduce the plasticizing time and the number of cycles.
3. Preparation conditions for effective control of mold temperature The temperature control system consists of three parts: mold and mold temperature machine heat transfer fluid. In order to ensure that heat can be added to or removed from the mold, each part 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 flow channel must match the capacity of the pump (pump pressure). The temperature distribution in the mold cavity has a significant impact on the deformation and internal pressure of the part. Reasonable setting of cooling channels can reduce internal pressure, thereby improving the quality of injection molded parts. It can also shorten cycle time and reduce product costs. Secondly, the mold temperature machine must be able to maintain the temperature of the heat conducting fluid within the range of 1 ℃ - 3 ℃, depending on the quality requirements of the injection molding part. The third is that heat conducting fluids must have good thermal conductivity, and the most important thing is to be able to introduce or export a large amount of heat in a short time. From a thermodynamic perspective, water is significantly better than oil.