Blow Mould To Ensure That The Two Mold Alignment, Improve Die Life
Manufacturing Blow Mould cavity most commonly used mechanical processing and casting two methods. Which method is used with a variety of factors, such as mold material, the number of mold cavity, the complexity of the cavity and cavity accuracy requirements. A mold material is the most important factor in determining the manufacturing method. Aluminum is difficult to cast, only some of the aluminum alloy can be cast. In general, the high silicon content of aluminum alloy is most suitable for casting, and high-strength aluminum alloy can not be cast, use mechanical processing methods. Copper beryllium alloy mold has better performance.
Most of the steel molds are machined and made of zinc alloy. If the number of cavities is larger, the cavity is complex or irregular, the cavity size tolerance is lower, the cavity volume is larger or the production lot is less, and the casting method can be used to make the mold. The cost of casting molds is low, but the durability and thermal conductivity are lower than those of machining molds. The use of certain special casting method can produce high-performance molds, such as pressure casting method can reduce the aluminum and copper beryllium alloy porosity,Blow Mould to ensure a higher accuracy of the cavity. Blow mold mold cavity machining methods are milling, grinding and so on.
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Mold manufacturing methods are cold extrusion, hot extrusion, EDM processing and welding. The cold extrusion method is suitable for small molds, especially multi-cavity molds,Blow Mould to ensure the consistency of the cavity. For large volumes (eg 3m.) Cavities, they can be manufactured by machining together with welding methods. Require blow molding products with high dimensional accuracy, the use of copy milling method to create mold cavity. The shrinkage should be taken into account when designing the cavity size. For the machining cavity,Blow Mould the shrinkage rate includes the shrinkage of the blow molded product and the shrinkage rate of the post-mold processing. For the casting cavity, consider the shrinkage of the mold material during casting.
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The final stage of mold cavity manufacturing is polishing, sandblasting or etching. Before etching, especially in the need to etched fine pattern, to remove the cutting, EDM, grinding or extrusion processing of scales and traces, to ensure a certain degree of finish. Unless the production lot is large, the mold cavity generally without hardening treatment, and rarely plated metal (such as chrome). If the cavity to be hardened or chrome,Blow Mould should be carried out after etching. The billet block, the rod, the guide pillar and the guide sleeve and so on most steel or the copper beryllium alloy through the mechanical manufacture manufacture, also through the hardening treatment.
The thermal conductivity of Blow Mould s is worse than that of cutting aluminum molds. The cavity of the mold cavity usually requires broken 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.
Blowing transparent containers to a high degree of polishing blow mold cavity, the production process to be polished every time. Use polish and soft cotton paper to polish the mold cavity, so that a small amount of polishing agent to penetrate the cavity surface, and then use a clean cotton paper to polish until the mold cavity appears so far. Polishing should always change the cotton paper,Blow Mould so as not to scratch the mold cavity. Bubble mold clip blank mouth after wear and tear by skilled manufacturers to repair. The shearing block on the neck of the blow mold and the shearing sleeve on the intake rod is the key part and must be kept in good condition and replaced if necessary. For example, when the cutting edge of the cutting block is unevenly worn, the molded container may leak at the time of use. Blow mold cooling channel due to clogging or corrosion and affect the flow of cooling medium should be immediately cleaned. Blowing mold guide pin and guide sleeve to regular lubrication, each work must be replaced at least once a year to ensure that the two mold alignment, improve die life. When the production or blow mold to stop the inventory, to use compressed air blowing mold cooling channel, mold cavity to be coated with protective agent, so as not to be corroded.