Coated sand mold for casting

Abstract

The invention relates to the technical field of molds, in particular to a coated sand mold for casting. The coated sand mold comprises a base, wherein four hydraulic rods are fixedly mounted on the upper surface of the base, a lower mold is fixedly connected to the upper ends of the four hydraulic rods, an upper mold is movably connected to the upper surface of the lower mold, supporting plates are fixedly connected to the two sides of the edge of the lower surface of the upper mold, the lower surfaces of the supporting plates are fixedly connected with the upper surface of the base, locking mechanisms are symmetrically arranged in the middle of a joint of the lower mold and the upper mold, an injection molding mechanism is arranged at the top of the upper mold, the injection molding mechanism comprises an injection barrel, a first piston, a first piston rod, a first toothed plate, a gear, a second toothed plate, a U-shaped pipe, a lengthened pipe and a lengthened pipe, and the first toothed plate and the second toothed plate are both slidably mounted at the upper end of the outer surface of the upper mold. The coated sand mold can reduce impact of pouring liquid on an inner wall of a cavity, so that the pouring liquid flows more smoothly, bubbles are reduced, and the production quality of products is improved.

Description

technical field [0001] The invention relates to the technical field of molds, in particular to a coated sand mold for casting. Background technique [0002] Coated sand is the molding sand or core sand whose surface is covered with a layer of solid resin film before molding. There are two coating processes: cold method and hot method: the cold method dissolves the resin with ethanol, and adds urotropine during the sand mixing process, so that the two are coated on the surface of the sand, and the ethanol volatilizes to obtain coated sand; Preheat the sand to a certain temperature, add resin to melt, stir to coat the resin on the surface of the sand, add urotropine aqueous solution and lubricant, cool, crush, and sieve to obtain coated sand. For steel castings and iron castings. [0003] Chinese patent discloses a coated sand mold for casting, the patent application number is CN201910547141.8, a coated sand mold for casting, including an upper mold and a lower mold; the upp...

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Problems solved by technology

[0004] Although the above comparative patent can simplify the installation steps between the upper mold and the lower mold, the staff can install the upper mold on the lower mold more quickly and conveniently, thus speeding up the work efficiency of the staff in installing the upper mold and the lower mold, however, When pouring manually, the pouring liquid is poured from the pouring port into the mold, and the pouring liquid hits the inner wall of the cavity, resulting in unstable flow of the pouring liquid and dispersion in the cavity, so that the gas can easily enter the pouring liquid, and the pouring liquid The presence of air bubbles in the castings can lead to imperfections in the surface of the castings, resulting in poor quality castings

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