What should be paid attention to in the design and processing of bottle blowing mold ?
The following is a list of key points for the design and processing of bottle blow moulds. For beginners, keep these routines in mind and improve your efficiency.
The material of the mould must have high thermal conductivity and enough cutting edge strength.Aluminium 70/75 is the advanced alloy for most molds.Due to the good machining performance of the metal, the cavity is usually machined.The copper alloy mould also has high heat transfer and good corrosion resistance.However, the cost is high, the price is expensive, and because it is three times the proportion of aluminum, it may be more serious in forming machinery.The steel alloy mold is easy to be repaired by welding or Mosaic.
The thermal conductivity of cast aluminum die is less than that of cutting aluminum mould.The cutting of mold cavity usually requires copper alloy or stainless steel inlay, because the strength and hardness of cast aluminum can not meet the requirement of cutting edge.
Kirk alloy (zinc) casting can be made on the steel mold.Mold cavity and floor are cast to a certain size.Because kirk alloy is not strong enough to cut off the plastic, the operation hole and shoulder area are inlaid with copper alloy or stainless steel.The bottom and neck are also inlaid with these two metals.Casting molds can also be cast by copper alloy.It is easy to cast steel mold cavity because it is cast by pressure or gravity.These mold cavities have many fine parts made from steel or ceramic molds.
Cooling plays a challenging and important role in mold design.The borehole cooling line is installed where it is most needed to cool.In order to achieve better production control, most die designs have several independent cooling zones.The neck and the bottom need to drain the most heat, thus requiring the most effective cooling.
Cutting mouth.The depth of design of the cutting area may be a major factor in the production and quality of components.The cutting area is the place where the excess plastic enters the body when the parts are blown.The type and shape of the blanks may determine the welding condition of a part.
For harder resins, steel or copper alloys are required to be used as cutting materials.Sometimes the cutting area should be blown with air to accelerate the plastic cooling, remove excess material, and prevent component distortion.
Exhaust.When the parts blow molding, the mold must be exhaust in order for the gas to escape quickly.The most common and economical exhaust method is surface exhaust.Deep sandblasting or texturing of the cavity is also helpful for venting.Another important reason to vent (for those parts that have to be blown into tight narrow bands) is to show detail.