Lost foam casting method of double-layer exhaust pipe for engine

Abstract

The invention relates to a lost foam casting method of a double-layer exhaust pipe for an engine, which is characterized by comprising the following steps of: dividing the engine into at least four separating units by using a double-layer exhaust pipe model to make a polystyrene foam forming die, injecting polystyrene beads into dies of the four separating units to make a polystyrene foam model of each separating unit, adhering the separating units into an exhaust pipe integral model; coating a venting paint on the surface of the integral model; combining the exhaust pipe model into a die string according to a casting process, and adhering on a casting system; implanting the combined integral model into a cast box and adding dried sand in the sand box while compacting the dried sand by using a compaction table, exposing a pouring cup; and pouring molten iron into a pouring pipe mouth at suitable casting temperature. The invention provides a lost foam casting method of a double-layer exhaust pipe for an engine, which can effectively solve the problems of cold lap, left residual slag or air holes of casting, bulges, sand penetration and the like occurring in the lost foam casting process of the double-layer water-cooling exhaust pipe and is beneficial to lowering the production cost and improving the casting quality of the double-layer exhaust pipe for the engine.

Description

technical field [0001] The invention relates to a lost foam casting method of a double-layer exhaust pipe for an engine. Background technique [0002] The engine uses a double-layer water-cooled exhaust pipe at the outlet of the cylinder head of the internal combustion engine, because it greatly reduces the temperature of the exhaust gas, reduces the volume of the gas, and reduces the outlet resistance, thereby increasing the power of the engine. It is widely used in foreign advanced countries, but it is not widely used in our country at present, and it is a product with great potential. At present, domestic products mainly use resin sand to make cores. After resin sand is poured, the amount of exhaust gas is large, the pollution is large, and the cost is more than 15% higher than that of lost foam. [0003] At present, the traditional casting method of the existing water-cooled double-layer exhaust pipe is: the cavity is made of ordinary sand or chilled resin sand, the inn...

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Problems solved by technology

[0006] The object of the present invention is to provide a lost foam casting method for double-layer exhaust pipes for engines. Sand sticking and other problems are beneficial to reduce production costs and improve the casting quality of double-layer exhaust pipes for engines

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