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High nickel austenite spheroidal graphite cast iron automobile exhaust branch pipe and casting method

A technology for ductile cast iron and automobile exhaust, which is applied in the direction of exhaust devices, mechanical equipment, engine components, etc. It can solve the problems of high surface tension, easy shrinkage cavities in castings, and many hot spots, so as to ensure mold filling and pouring Speed, solution to shrinkage defects, good corrosion resistance

Inactive Publication Date: 2008-06-04
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

Due to the characteristics of high nickel austenitic nodular cast iron molten iron has large surface tension, large shrinkage tendency, fast cooling and poor fluidity, it is used in automobile exhaust manifolds. More, the castings are most prone to shrinkage cavity, shrinkage porosity, insufficient pouring and cold shut defects
Therefore, the casting technology of high-nickel austenitic nodular cast iron in automobile exhaust manifold is not mature enough at home and abroad, and needs to be further developed.

Method used

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  • High nickel austenite spheroidal graphite cast iron automobile exhaust branch pipe and casting method
  • High nickel austenite spheroidal graphite cast iron automobile exhaust branch pipe and casting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Such as figure 2 The casting method of the high-nickel austenitic nodular cast iron automobile exhaust manifold shown adopts the processes of core making, molding, molding, molten iron smelting, pouring, unpacking and shakeout, and cleaning and storage. Wherein the main improvement process steps are:

[0020] 1. Core making: low-nitrogen and high-temperature coated sand is used. The strength of the coated sand is 3.4Mpa, and the low gas generation is 14m / g; the inner sand core of the exhaust manifold is an internal circulation sand core, and the exhaust performance under working conditions Well, the outer cavity sand core is inlaid with chilled iron or inner chilled iron at the position of the two tube clamps to reduce the temperature gradient and balance the temperature field; the core making and molding processes can be carried out at the same time.

[0021] 2. Molding: After the coated sand core is combined and formed, the large-hole flow casting system technology ...

Embodiment 2

[0027] Such as figure 2 The casting method adopts the processes of core making, molding, molding, molten iron smelting, pouring, unpacking and shakeout, and cleaning and storage. Wherein the main improvement process steps are:

[0028] 1. Core making: low nitrogen and high temperature coated sand, the strength of the coated sand is 4Mpa, and the low gas generation is 12m / g; the inner sand core of the exhaust manifold is an internal circulation sand core, and the exhaust performance is good under working conditions , The outer cavity sand core is inlaid with cold iron or inner cold iron at the position of the two pipe clamps to reduce the temperature gradient and balance the temperature field; the molding process can be carried out at the same time as the core making.

[0029] 2. Molding: After the coated sand core is combined and formed, the large-hole flow casting system technology is adopted, and the side riser is used, and the static pressure head during pouring is provid...

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Abstract

The invention relates to a high-nickel austenite nodular graphite cast iron vehicle discharge branch tube and relative casting method. Wherein, said casting method comprises core production, shaping, combining, smelting, irrigating, dropping sand and cleaning casting; while the core production uses low-nitrogen high-temperature cover sand; the inner sand core of discharge branch tube is internal flow sand core; the outer chamber sand core embeds cold iron at the clamp part between two tubes; and it uses side riser and uses the static compressor in irrigation supplied by wet mound sand; the smelting temperature is 1600-1700Deg. C; and it uses magnetite-silica alloy as nodulizer; and uses ferrosilicon and strontium inoculant to inoculate for two times; and it uses large flux and high temperature irrigation. The inventive branch tube has better corrosion-resistance, high-temperature resistance, and non radiation.

Description

technical field [0001] The invention belongs to the technical field of automobile exhaust manifolds, and in particular relates to a high-nickel austenite ductile iron automobile exhaust manifold and a casting method. Background technique [0002] With the development of social and economic conditions, medium and high-end cars are constantly emerging on the market, and their horsepower and emissions have higher and higher requirements for the working conditions of auto parts. For example, the working temperature of the traditional exhaust manifold exceeds 900 ° C, especially in Under the alternating hot and cold working conditions, the strength and plasticity of the exhaust manifold are poor, which is easy to cause deformation and cracking, resulting in insufficient working pressure of the engine, which affects the speed of the car, and causes engine failure in severe cases, which cannot meet the requirements of the automobile industry. Development, so the selection of materi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D25/00C21C1/08F01N7/10F01N13/10
Inventor 田中青刘松奇齐晓波李平衡贾猛王青松杨双杰申辉田政
Owner 西峡飞龙特种铸造有限公司