Blow Mould Production Of Fine
The material for making the mold must have high thermal conductivity and sufficient cutting edge strength. The current aluminum 70/75 is the production of most of the mold with the advanced alloy. As the machinability of the metal is good, the mold cavity is usually machined. Copper alloy mold also has high heat resistance and good corrosion resistance. However, its high cost, expensive, and because of its weight three times the aluminum,Blow Mould may be more serious in the molding machine wear. Steel alloy molds are easy to repair with welding or mosaic methods.
The thermal conductivity of cast aluminum molds is worse than that of cutting aluminum molds. The cavity of the mold cavity usually requires beryllium copper alloy or stainless steel mosaic, because the strength and hardness of cast aluminum can not meet the requirements of cutting the edge of the blade.
Kirk alloy (zinc) castings can be made on steel master. The mold cavity and the bottom plate are cast to a defined size. As the strength of Kirk alloy is not enough to cut off the plastic, the operating hole and shoulder area are made of copper alloy or stainless steel. Bottom and neck are also inlaid with these two metals. Casting molds can also be made of cast copper alloy. It is easier to cast steel by a steel mold because it is pressed by pressure or gravity. These mold cavities have many finishes made from steel masks or ceramic molds.
Cooling in the mold design of a challenging and very important significance. Drilling cooling lines are installed in places where cooling is most needed. In order to carry out better production control,Blow Mould most molds are designed with several independent cooling zones. The neck and the bottom of the need to discharge the most heat, which requires the most effective cooling.
The design depth of the cut area may be a significant factor in component yield and quality. The cut area is where the excess plastic is blown into the part. The type and shape of the billet may determine the welding of a component.
For harder resins, it is necessary to use steel or copper alloy for cutting the billet material. Sometimes cut the billet area to use air to blow, to speed up the plastic cooling,Blow Mould remove the excess material to prevent distortion of components.
In the blow molding of parts, in order to make the gas quickly escape, must make the mold exhaust. The most common and economical exhaust method is surface exhaust. Deep sandblasting or texture treatment of the mold cavity also contributes to exhaust. Another important reason for exhausting (for those parts where plastic must be blown into tightly narrow spaces) is to show the details.
When the container with the same volume is molded, the amount of air to be discharged in the blow mold is much larger than that of the injection molding die. The volume of air to be discharged in the injection molding die is at most equal to the amount of melt injected into the mold cavity. And for the blow mold, the volume of air to be excluded is equal to the volume of the mold cavity minus the volume of the mold after the full mold has been inflated,Blow Mould where the latter accounts for a large proportion, but there is still a certain amount of air retained in the parison And mold cavity, especially for barrels, fuel tanks and the like large volume blow molding products.