In the field of precision mold design, the problem of thermal balance is one of the key factors affecting mold performance and product quality.
During the working process of precision mold, heat will be generated due to the filling flow of plastic melt, solidification molding, and friction between the mold and the equipment. If the heat cannot be dissipated in time and evenly, it will lead to uneven temperature distribution of the mold. For example, in an injection mold, if the local temperature of the mold cavity is too high, the plastic may solidify prematurely, affecting the filling fluidity of the melt, and then causing defects such as product shortage and dimensional instability; while too low temperature may extend the molding cycle, reduce production efficiency, and may also lead to poor surface quality of the product, such as cold material lines.
To solve the problem of thermal balance, first of all, the cooling water channel should be reasonably arranged in the mold structure design. The cooling water channel should be as close to the cavity surface as possible and evenly distributed to ensure that the heat can be quickly and effectively conducted out. For example, the use of conformal cooling water channel design can better fit the mold cavity contour, greatly improve the cooling efficiency, and make the temperature of each part of the mold more uniform.
The choice of mold material also has an important impact on thermal balance. Selecting mold materials with high thermal conductivity, such as some high-performance alloy steels, can speed up the heat conduction speed inside the mold and facilitate heat dissipation.
In addition, a hot runner system can also be used. The hot runner can keep the plastic melt in the runner in a molten state, reducing the heat accumulation caused by the solidification of the gate, while also reducing the generation of waste, improving production efficiency and product quality, and helping to control the overall thermal balance of the mold.
During the mold processing process, the processing accuracy and surface finish of the cooling water channel must be ensured to avoid affecting the cooling effect due to rough or blocked water channels. At the same time, a heat-insulating coating can be applied to the mold surface to reduce the heat loss of the mold to the external environment, so that more heat can circulate and dissipate inside the mold, further optimizing the thermal balance.
In addition, with the help of advanced mold temperature control systems, such as intelligent temperature control equipment, the temperature of each part of the mold can be monitored in real time, and the flow and temperature of the cooling medium can be automatically adjusted according to the set temperature parameters, accurately maintaining the thermal balance of the mold, thereby ensuring that the precision mold can operate stably in a long-term, high-precision production process and produce products that meet quality requirements.
