Digital die-free sand mould extrusion forming method

Abstract

The invention relates to a digital die-free sand mould extrusion forming method, belonging to a combined casting and rapid forming field. The digital die-free sand mould extrusion forming method provided by the invention has the following steps of: establishing a CAD (Computer Aided Design) model according to a sand mould shape, establishing a similar model of a sand mould according to the CAD model, compiling an extrusion head control code, and controlling an extrusion head to generate a similar shape of the sand mould; intruding a shaping material and shaping through extrusion, so as to obtain a sand mould pre-forming piece; and milling the sand mould pre-forming piece so as to obtain a final sand mould. Compared with the conventional shaping method, according to the shaping method provided by the invention, the die manufacturing step is eliminated, the machining process is reduced, the production period is reduced, and the production cost of the sand mould is greatly reduced. The digital die-free sand mould extrusion forming method is particularly applicable to machining and manufacturing a small scale of the sand moulds with complex structures.

Description

technical field [0001] The invention relates to a digital moldless sand extrusion forming method, which belongs to the intersecting technical field of casting and rapid prototyping. Background technique [0002] Casting is the foundation of the manufacturing industry and the basic industry of the national economy. All walks of life cannot do without castings. Casting is a more economical blank forming method. For parts with complex shapes, casting can show more economy, such as cylinder blocks and cylinder heads of automobile engines, ship propellers and exquisite artworks. For some parts that are difficult to cut, such as nickel alloy parts, they cannot be formed without casting. At the same time, the size and weight of cast parts are widely adaptable, and the types of metals are almost unlimited. In recent years, with the rapid development of the national economy, my country's foundry industry has also developed rapidly, and the output of various castings has continued to...

AI Technical Summary

Problems solved by technology

The existing sand molding methods are divided into manual molding and mechanical molding. The essence is sand compaction and mold removal. However, for sand molds with small batches and complex shapes, the mold manufacturing and processing of the molding machine will cause huge losses, especially When preparing a single sand mold, the use of the mold is one-time, and the cost is high. At the same time, changing the mold will also occupy a lot of time in the entire molding process.

[0004] The present invention proposes a digital moldless sand extrusion forming method, which can improve the shape closeness of sand molds and reduce post-processing procedures. At the same time, the extrusion platform is self-adaptive, which solves the high cost and time-consuming preparation of sand molds with small batches and complex shapes. The problem

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