The temperature of the injection mold has a great influence on the filling flow, curing setting, production efficiency and shape and dimensional accuracy of the plastic melt. Each plastic injection molding has a reasonable mold temperature area, so that the fluidity of the melt is easy to fill the cavity, the shrinkage and warpage of the plastic parts after demolding are small, the size is stable, and the mechanical properties and surface quality are also high. In order to control the temperature of the mold, it is necessary to design a temperature adjustment system, generally using a mold cooling or heating method, if necessary, both, and more cooling devices are used in the casing of the mobile phone casing.
1. The necessity of temperature regulation
The mold temperature has a great influence on the molding quality and molding efficiency of the rubber parts. In the mold with higher temperature, the fluidity of the molten rubber is better, which is beneficial to the filling of the cavity of the rubber material, and obtains the appearance surface of the high-quality rubber parts, but the curing time of the rubber material becomes longer and the deformation is easy when it is ejected;
For the crystalline rubber compound, it is more favorable for the crystallization process to avoid the change of the size of the rubber parts during storage and use; in the mold with lower temperature, the molten rubber is difficult to fill the cavity, resulting in an increase in internal stress and a matte surface. Produces defects such as silver streaks and weld lines.
Different rubber compounds have different processing techniques, and the surface requirements and structures of various rubber parts are different. In order to produce the rubber parts that meet the quality requirements in the most effective time, the molds are required to maintain a certain temperature and mold temperature. The more stable, the more consistent the requirements for the size and shape of the rubber parts produced and the appearance quality of the rubber parts.
Therefore, in addition to the factors in mold manufacturing, the mold temperature is an important factor in controlling the quality of the rubber parts. The mold temperature should be fully considered in the mold design.
2. Principle of mold temperature control
In order to ensure the production of high-quality, high-quality, dimensionally stable, and low-profile rubber parts in the most efficient time, the basic principles of mold temperature control should be clearly understood during design.
1 Different compounds require different mold temperatures.
2 Different surface quality, different structure of the mold requires different mold temperatures, which requires specificity in the design of the temperature control system.
3 The temperature of the front mold is higher than the temperature of the rear mold. Under normal circumstances, the temperature difference is about 2-3o.
4 The front mold temperature required for the fire pattern is higher than the front mold temperature required for the general smooth surface. When the current mold is required to pass hot water or hot oil, the general temperature difference is about 40o.
5 When the actual mold temperature can not reach the required mold temperature, the mold should be heated. Therefore, the mold design should fully consider whether the heat brought into the mold can meet the mold temperature requirements.
6 The heat that is brought into the mold by the rubber is consumed by heat radiation and heat conduction, and most of the heat needs to be carried out of the mold by the circulating heat transfer medium.
7 The mold temperature should be balanced, and there should be no local overheating or excessive cooling.
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