Blow molding mould/ mold
The factors that determine the efficiency of the mold are as follows:
Materials for making moulds must have high thermal conductivity and adequate cutting edge strength. At present, aluminum 70 / 75 is the most advanced alloy for making most moulds. Because of its good machinability, the metal cavity is usually machined by machine. The copper alloy mold also has high heat transfer and good corrosion resistance. However, the cost is high, the price is high, and its proportion is three times higher than that of aluminum. It is easy to repair with steel alloy mold by welding or mosaic.
Cooling plays a challenging and very important role in mold design. The borehole cooling line is installed in the place where it is most necessary to cool down. In order to carry out better production control, most dies are designed with several independent cooling zones. The neck and bottom need to discharge the most heat, and therefore require the most effective cooling.
3) cutting blank design;
cutting billet. The design depth of the cut zone may be a major factor in the yield and quality of components. The area of the cut off area is where the excess plastic enters the part when blowing. The type and shape of the blanks may determine the welding condition of a component.
For hard resin, it is necessary to use steel or copper alloy as cutting material. Sometimes the cut area should be blown by air to speed up plastic cooling, remove excess materials and prevent distortion.
Exhaust. When parts blow molding, in order for the gas to escape quickly, the mold must be exhausted. The most common and economical exhaust method is surface exhaust. Deep sand blasting or texturing treatment of the mold cavity also contributes to exhaust. Another important reason for exhausting (for those parts that must be blown to a tight narrow cell) is to show details.
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