Patternless sand mould numerical-control machining method by coating sand in iron mould

Abstract

The invention discloses a patternless sand mould numerical-control machining method by coating sand in an iron mould. The patternless sand mould numerical-control machining method by coating the sand in the iron mould includes the steps: building a CAD (computer-aided design) model of a required sand mould; extracting the contour of a cavity of the sand mould, optimizing the contour and building a sand billet CAD model; accumulating molding sand (2) in the iron mould (1) according to the sand billet CAD model; tamping the molding sand, and measuring and repairing the sand billet until the size of the sand billet is close to that of the CAD model; and performing numerical control machining for the sand billet to achieve molding of the sand mould after the sand billet in the iron mould is cured. The patternless sand mould numerical-control machining method by coating the sand in the iron mould has the advantages of simple process, easiness in implementation, low pollution and high efficiency.

Description

technical field [0001] The invention relates to a method for forming a moldless sand mold of an iron mold covered with sand for casting, which belongs to the field of casting forming. Background technique [0002] Iron mold sand-covered casting is to use low-pressure compressed air to blow fluid-state coated sand into the heated iron mold and mold cavity, so that the cavity is evenly covered with a layer of 5-8mm heat-cured sand to form a mold. A casting process. Due to the good rigidity of the sand-coated iron mold and the relatively thin sand-coated layer, the cooling speed of the casting is fast and the sand particle size is fine, so the dimensional accuracy, compactness, surface quality, grain refinement and spheroidization rate of the casting can be significantly improved. , At the same time, it can realize casting without riser. It is widely used in some castings with difficult casting process, such as crankshaft and other castings. [0003] Sand-coated iron molds n...

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Problems solved by technology

[0004] Aiming at the deficiencies of the existing sand-coated iron mold process, the present invention proposes a sand-coated iron mold sand-free CNC machining and forming method, aiming at solving the problem of long cycle time and high cost of single-piece and small-batch castings processed by sand-coated iron molds. , process complex issues

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