A casting method of an ultrafine high-nickel-content air tube

Abstract

The invention discloses a casting method of an ultrafine high-nickel-content air tube. The method comprises following four steps: core preparing, moulding, pouring and sand knock-out. The method is mainly characterized in that: a pouring process of the method adopts a top pouring manner, a product is turned transversely by 90 degrees and poured, the problem that high-nickel-content tubes having a diameter of 26 mm, an inner diameter of 14 mm and a wall thickness of 4 mm are difficult to cast and mould is overcome by controlling the pouring temperature, speed and time, a process yield of the method is high, moulding operation is convenient, the consumption amount of metal liquids is small, the production cost is reduced, and requirements on the large-scale production efficiency are satisfied.

Description

technical field

[0001] The invention relates to a casting method of a high-nickel air pipe, in particular to a casting method of an air pipe with a smaller diameter. Background technique

[0002] In recent years, the Brazilian market of Chinese automobile exports has developed rapidly. Since the implementation of the world's first vehicle exhaust pollution control standard, the secondary air injection system has been widely used in automobiles. It is actually a practical technology for exhaust emission control. , to reduce the emission of HC and CO in the exhaust. And practice has also proved that the air injection system can achieve good results on gasoline and diesel vehicles. Its working principle is that the air pump sends fresh air into the engine exhaust pipe, so that the HC and CO in the exhaust gas are further oxidized and burned, that is, the oxygen in the introduced air is combined with the HC and CO in the exhaust pipe in the exhaust pipe. Further combined to fo...

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