The use of precision plastic molds is very extensive, not only high precision, but also very favorable in terms of price. However, the cooling rate has not been improved, and what are the main reasons? Briefly speaking,
1. Precision plastic mold material and its cooling method. When it comes to mold steel materials, including mold core, cavity material and mold base material, the heat transfer coefficient is high. The higher the heat transfer coefficient of precision plastic mold material, the better the heat is transferred from the plastic per unit time, the shorter the cooling time.
2. Plastic product design. Mainly the wall thickness of plastic products. The greater the thickness of a precision plastic mold product, the longer it will cool.
3. Plastic material selection. This refers to the measurement of the conduction speed of plastic where the heat is cooled from the hot ground. The higher the heat transfer coefficient of plastic, the better the heat transfer effect, or the lower the specific heat of the plastic, the temperature is easy to change, so the heat is easy to dissipate. The heat transfer effect is better and the required cooling time is shorter.
4. Cooling water configuration. The closer the cooling water channel is to the cavity, the larger the channel diameter, the more the number, the better the cooling effect, the shorter the cooling time; the coolant flow rate, the larger the cooling water flow rate, and the cooling water is carried by heat convection. The better the effect of taking heat.
5. The nature of the coolant. The viscosity and heat transfer coefficient of the coolant also affect the heat transfer effect of the precision plastic mold injection. The lower the viscosity of the coolant, the higher the heat transfer coefficient, the lower the temperature, and the better the cooling effect.