Centrifugal hollow molding method and device

Abstract

The invention discloses a centrifugal hollow molding method and a device. The centrifugal hollow molding device is provided with a molding device and a centrifugal device, and the material is first made into a parison including a surface layer solidified layer and an inner core non-solidified layer by the molding device, and then passed through the molding device. The centrifugal device makes the non-solidified layer in the parison break away from the parison under the action of centrifugal force to complete the hollow matrix forming. The hollow product produced by the centrifugal hollow forming method and device has high external surface quality, good wall thickness uniformity and acceptable wall thickness. It has strong controllability and high dimensional stability, and the collected overflow can be recycled and reused, which has the advantages of low manufacturing cost and wide 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-assisted injection molding, molten core injection molding, etc. The advantages and disadvantages of these hollow molding processes are analyzed as follows: 1) Blow molding: advantages: simple process, easy to manufacture Low cost, high production capacity, product wall thickness, wide adjustable range, and easy to manufacture large-volume hollow parts and thin-walled products; Disadvantages: relatively limited requirements on materials, low quality of product outer surface, cold material scars, used for non-circular The wall thickness of the product is uneven; 2) Rotational molding: advantages: suitable for small batches of large volume products, the surface of the product is more beautiful tha...

AI Technical Summary

Problems solved by technology

[0002] At present, plastic hollow molding processes mainly include injection molding, blow molding, rotational molding, gas-assisted injection molding, molten core injection molding, etc. The advantages and disadvantages of these hollow molding processes are analyzed as follows: 1) Blow molding: advantages: simple process, easy to manufacture Low cost, high production capacity, product wall thickness, wide adjustable range, and easy to manufacture large-volume hollow parts and thin-walled products; Disadvantages: relatively limited requirements on materials, low quality of product outer surface, cold material scars, used for non-circular The wall thickness of the product is uneven; 2) Rotational molding: advantages: suitable for small batches of large volume products, the surface of the product 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, forming The cycle is very long, the cost is high, and the size error is large; 3) Gas-assisted injection molding: advantages: it has the same product 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 : 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) Melt core method: Advantages: It can simplify complex molds, and can also The hollow product has 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 afterwards, the core needs to be melted out by heating and cleaned Residue, high production cost, 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 to the requirements for materials, it cannot be widely used

Images