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

A technology of air tube and thin height, which is applied in the direction of casting molding equipment, casting mold, casting mold composition, etc., can solve the problems of difficult molding, and achieve the effect of fast solidification speed, easy operation and low roughness

Inactive Publication Date: 2015-04-22
西峡飞龙特种铸造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a new casting method, which can solve the problem of difficult forming of high-nickel pipe products with a small diameter, and further to solve the problem of high-nickel pipes with a diameter of 26mm, an inner diameter of 14mm, and a wall thickness of 4mm. The problem of casting molding is to ensure the quality and performance of casting products, greatly reduce the scrap rate in the production process, improve the process yield of castings, reduce production costs, and meet the requirements of large-scale production

Method used

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

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Effect test

Embodiment 1

[0018] figure 1 It is a casting flowchart of the high-nickel air pipe of the present invention, adopting 4 steps of core making, moulding, pouring, and shakeout:

[0019] a. Core making: low-nitrogen high-strength coated sand is used. The strength of the coated sand is ≥3.4MPa, and the low gas emission is ≤14m / g. Cold iron is inlaid at the position of the clamping position, and the vent hole is set in the inner sand core, which can make the venting of the sand core in the mold very smooth, and the vent hole will not be blocked by molten iron, thus avoiding the appearance of porosity on the working surface and improving the The quality of the workpiece has increased the qualified rate of the product to more than 98%;

[0020] b. Modeling: After the coated sand core is combined and formed, the large-hole flow casting system technology is used, and the side riser is used to feed the shrinkage. The static pressure head during pouring is provided by the green mold sand:

[0021] ...

Embodiment 2

[0025] The casting method of high-nickel austenitic nodular cast iron automobile air pipe adopts four steps of core making, molding, pouring and shakeout. The process steps are:

[0026] a. Core making: low-nitrogen high-strength coated sand is used. The strength of the coated sand is ≥3.4MPa, and the low gas emission is ≤14m / g. The position of the card position is inlaid with cold iron.

[0027] b. Modeling: After the coated sand core is combined and formed, the large-hole flow casting system technology is used, and the side riser is used to feed the shrinkage. The static pressure head during pouring is provided by the green mold sand:

[0028] c. Pouring: adopt the low-temperature rapid pouring process, control the pouring temperature at 1560°C±10°C, control the pouring speed of molten iron at 70~100Kg / min, control the temperature of the final pouring box at no less than 1540°C, and use the pouring process to control the product The method of pouring by flipping 90 degrees ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/24B22C9/08
Inventor 刘松奇彭德楼闫国富孙稳定王飞贾建法李可丹
Owner 西峡飞龙特种铸造有限公司
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