Manufacturing method of core for casting engine exhaust manifold

Abstract

The invention relates to a manufacturing method of a core for casting an engine exhaust manifold, comprising the following steps of: 1, manufacturing a resin assembly mould by a photocuring fast-shaping technique; 2, manufacturing reinforcing iron wires in shape of spatial spiral curve same as the core; 3, filling sands in the mould and putting into the reinforcing iron wires manufactured in the step 2; 4, scraping resin sands along a mould sectional surface by a scraper to make the resin sands protrude a little, and then folding the mould to press tightly; 5, opening the mould to take out the core and carrying out the proper post-treatment on the core after the resin sands are solidified. In the invention, the complex core resin assembly mould manufactured by the fast-shaping method has light weight and good strength, and the surface roughness thereof can also achieve Ra=3.2mum; therefore, in the premise of guaranteeing the quality of the manufactured core, the manufacturing cost and the manufacturing period of the mould can be greatly reduced, and the more complex shape of the manufacturing assembly is, the more remarkable advantages of the method are.

Description

technical field [0001] The invention belongs to the technical field of casting, in particular to a manufacturing method of a sand core used for casting an engine manifold exhaust pipe. Background technique [0002] In the casting process of exhaust pipes for engines, sand cores are used to form the inner cavity of the exhaust pipe. And this kind of sand core has a free-form surface shape in space, which is extremely complicated. The traditional sand core manufacturing method is to use the method of machining mold steel to manufacture a double mold, and then fill the mold with sand or machine sand to make the core. The mold made by this method has high strength, good dimensional accuracy and low surface roughness, so its service life is long and the quality of the sand core produced is also high. However, for extremely complex sand cores with free-form surfaces in space, it is very difficult to cut out the corresponding mold surface shape on the mold steel by machining. Thi...

AI Technical Summary

Problems solved by technology

[0003] The invention provides a manufacturing method of a sand core for engine manifold exhaust pipe casting, which solves the problems of high cost of machining complex molds and long manufacturing cycle in the traditional sand core manufacturing method

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