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浅谈中空吹塑模具的设计与加工要求

Design and processing requirements of hollow blow molding mold

制作模具的吹塑产品材料必须具有高导热性能和足够的切坯口刀刃强度。当前铝70／75是制作大多数模具用的高级合金。

The blow-moulded products must have high thermal conductivity and sufficient strength of cutting edge. At present, aluminum 70 / 75 is the most advanced alloy for making most moulds.

由于该金属的机加工性能好，故模腔通常采用机器切削而成。被铜合金模具也有高传热性和良好耐蚀性。然而，其成本高，价格贵，又因其比重三倍于铝，可能在成型机械上的磨损比较严重。被钢合金模具易于用焊接法或镶嵌法修复。

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, because of its high cost and high price, and because of its three times the proportion of aluminum, it may be worn seriously on the molding machinery. It is easy to repair with steel alloy mold by welding or mosaic.

铸铝模具的导热性能比切削铝模具的差些。模腔的切坯口通常需要破铜合金或不锈钢镶嵌，因为铸铝的强度和硬度满足不了切坯口刀刃的要求。

The thermal conductivity of cast aluminum mold is worse than that of cutting aluminum mold. The cutting edge of the cavity usually needs to be broken copper alloy or stainless steel inlay, because the strength and hardness of cast aluminum can not meet the cutting edge requirements.

吹塑产品冷却在模具设计中占有挑战性的和十分重要的意义。钻孔式冷却管线装设在最需要冷却的地方。为了进行较好的生产控制，大多数模具均设计有数个独立的冷却区。颈部与底部需要排出的热量最多，因而要求最有效的冷却。

The cooling of blow molding products is challenging and important 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.

切坯口。吹塑产品的切坯口区的设计深度可能成为部件产量与质量的重大因素。切坯口区是部件吹塑时过量塑料进人的地方。切坯口的类型与形状可能决定一个部件的焊接情况。

Cut the billet. The design depth of the cut-off area of blow-moulded products may be a major factor in the output 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.

吹塑模具在吹塑成型中起着至关重要的作用，是影响最终吹塑产品质量的决定性因素。

Blowing mold plays an important role in blow molding, and it is the decisive factor affecting the final product quality.