Water aided injection forming device

Abstract

A water-assisted injection molding equipment, comprising a high-pressure water forming device, a mold, a drainage device, connected to a mould, the high-pressure water forming device, an injection molding machine, and a drainage device, the high-pressure water forming device includes a small-flow water pump, a large-capacity The accumulator, the proportional decompression valve, the small flow water pump are connected with the large capacity accumulator, the large capacity accumulator is connected with the proportional decompression valve, and the proportional decompression valve is connected with the mould. The invention has the advantages of simple structure, low failure rate, reasonable operation process and less investment in equipment, which can better ensure the performance stability of the produced products, can be used to produce various parts with different specifications, and is suitable for large-scale popularization and use in industrial production. .

Description

technical field [0001] The invention relates to plastic molding equipment, in particular to a water-assisted injection molding equipment. Background technique [0002] Injection molding is to add granular or powdery plastic raw materials into the barrel of an injection molding machine. The plastic is melted under the action of heat and mechanical shear, and is mixed by the screw to form a relatively uniform melt, and then pushed by the screw. , quickly injected into the mold with low temperature, the high pressure makes the plastic melt fill the cavity and cling to the wall of the cavity, so as to obtain plastic parts with complete shape and high-quality surface. However, for some parts with thick walls and large differences in wall thickness, due to the shrinkage of plastics, traditional injection molding technology cannot produce such products with high-quality surfaces. At present, gas-assisted injection molding technology is generally used to produce such products. How...

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Problems solved by technology

The disadvantages of this device mainly include: (1) Since the water injection flow rate is directly controlled by the water pump, the flow rate of the water pump must be greater than the maximum flow rate required by water-assisted injection molding, so a high-power high-pressure pump must be used to meet the requirements, and high-power The high-pressure pump has the disadvantages of complex structure, high cost, easy damage to parts, and high maintenance cost, which is not conducive to production implementation; Adjusting the water injection flow will cause the pressure to not be accurately controlled, which will adversely affect the performance of the molded parts; (3) the existing equipment is not used in an injection molding cycle, and the water injection time only accounts for a small part of the molding cycle characteristics, and the setting of the action process is unreasonable, so there are disadvantages of high production cost and low action efficiency

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