Casting molds for the routine production of plastic hydrocyclone components

Abstract

Designs are presented for casting molds for making hydrocyclone components from plastics in seven standard sizes. The equipment allows to perform a considerable economy in constructional materials and reduce the effort in making hydrocyclones and improves the quality of the surface in the flow sections.Hydrocyclones have recently been used extensively in industry to separate inhomogeneous liquid systems [1-3]. The general industrial use is due to the compactness, convenient assembly in existing plant, high specific throughput, and reliability. On the other hand, those made by Russian industry in the main are made of metal, with low factors for the use of the material, and also difficulties in manufacture, which substantially restrict the scope for series production and the organization of centralized supplies to the chemical and related industries.To resolve the problem of routine hydrocyclone production, the Dzerzhinsk Polytechnical Institute has collaborated with the Moscow State University of Engineering Ecology (MGUIE) in developing a standard series of highly efficient and technologically sound plastic hydrocyclones [4]. The series includes seven standard sizes: TVP-25, TVP-32, TVP-40, TVP-50, TVP-63, TVP-80, and TVP-100 (the numbers correspond to the internal diameters of the body in mm). Technical characteristics are given in [4]. The hydrocyclones are made by pressure casting from strong and corrosion-resistant thermoplastics (polyamide, polystyrene, polycarbonate, and so on).The body 1 of a plastic hydrocyclone is made in a single pass with inlet and outlet tubes, and it has a cone 2 and a sand packing 4, which is impelled into the cone by means of a metal pressure nut 3 (Fig. 1).To organize routine production from plastics from the body, cone, and sand filling, all these standard sizes were accommodated by means of casting molds.Casting mold for making bodies (Fig. 2a): this consists of the mobile half-mold 10 and immobile part 12, together with the plunger 7, sleeves 6 and 11, driving sleeve 16, and expulsion space 4. The mold also includes the threaded inserts 10 and 13, the plates 3, 5, and 8, the flanges 2 and 14, the pin 19, the sleeve 18, the column 17, and the screws 1 and 15. To provide rapid solidification in the half-molds, there are channels 9 for supplying cooling water. A casting mold has one plane of section. To avoid considerable complication in the design, the casting mold works in semiautomatic mode with manual setting of the sleeve 11.Casting mold for making cones of all standard sizes (Fig. 2b): this consists of the immobile part 6 and mobile housing 5, to which are attached the sections of the molds 8, 9, and 10, the immobile flange 7 and the mobile flange 2,

Prototipado rápido en la fabricación de moldes impresos en 3D para soplado de plástico

“…Como una solución alternativa a los moldes, la impresión 3D se convierte en una «innovación tecnológica revolucionaria impulsada por la flexibilidad que proporciona y la economía potencialmente favorable» [3]. Otras aplicaciones de los moldes impresos son su uso en la fabricación a mano de piezas compuestas [4], fabricación de piezas plásticas [5], desarrollo de moldes de inyección de cera de bajo costo [6]. Mientras que altera los enfoques tradicionales de fabricación y promueve la expansión de tecnologías de prototipado rápido y fabricación digital.…”