Centrifugal hollow forming method and device

Abstract

The invention discloses a centrifugal hollow forming method and device. The centrifugal hollow forming device is provided with a forming device and a centrifugal device. Materials are manufactured into parisons containing surface curing layers and inner core non-curing layers through the forming device firstly, and the non-curing layers in the parisons are separated from the parisons under the action of centrifugal force through the centrifugal device, so that hollow bases are formed. Hollow products produced through the centrifugal hollow forming method and device are high in outer surface quality, good in wall thickness evenness, high in wall thickness controllability and high in size stability; collected overflow materials can be reused; and the centrifugal hollow forming device has the beneficial effects of being low in manufacturing cost and wide in application range.

Description

technical field [0001] The invention relates to the field of product molding, in particular to a hollow product molding method and device. Background technique [0002] At present, plastic hollow molding processes mainly include injection molding, blow molding, rotational molding, gas injection molding, melt core injection molding, etc. The advantages and disadvantages of these hollow molding processes are analyzed as follows: 1) Blow molding: advantages: simple process, low manufacturing cost Low production capacity, high product wall thickness, large adjustable range, and easy to manufacture large-volume hollow parts and thin-walled products; Disadvantages: relatively limited requirements for materials, low quality of product outer surface, cold material scars, used for non-round products Uneven wall thickness; 2) Rotational molding: Advantages: suitable for small batches of large-volume products, the product surface is more beautiful than blow molding, the wall thickness ...

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Problems solved by technology

[0002] At present, plastic hollow molding processes mainly include injection molding, blow molding, rotational molding, gas injection molding, melt core injection molding, etc. The advantages and disadvantages of these hollow molding processes are analyzed as follows: 1) Blow molding: advantages: simple process, low manufacturing cost Low production capacity, high product wall thickness, large adjustable range, and easy to manufacture large-volume hollow parts and thin-walled products; Disadvantages: relatively limited requirements for materials, low quality of product outer surface, cold material scars, used for non-round products Uneven wall thickness; 2) Rotational molding: Advantages: suitable for small batches of large-volume products, the product surface is more beautiful than blow molding, the wall thickness can be controlled and the uniformity is very good; disadvantages: the use of materials is very limited, and the molding cycle Very long, high cost, and large dimensional error; 3) Gas-assisted injection molding: Advantages: It has the same surface quality as injection molding, and has smaller internal stress and less material usage, and the material can be used in a wide range; Disadvantages: It is not suitable for the production of thin-walled products, and it is difficult to guide and control the internal gas path of the product, the wall thickness difference at the corner of the gas path is huge, and the molding cycle is long; 4) Melting core method: advantages: it can simplify complex molds, and can also make Hollow products have precise internal dimensions, and the quality of the external surface is comparable to that of injection molding; Disadvantages: Before production, a pre-formed low-temperature metal melting core needs to be placed in the mold, and afterward, it is necessary to melt the core and clean the residue by heating , the production cost is high, and because the melt flow in the injection molding process will impact the core, it will not be possible to use hollow products with large abdomen and small holes without suitable support positions. In addition, the requirements for materials make it impossible to promote its use on a large scale

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