The Status and development trend of forming materials in automobile exhaust manifold

The company is committed to the sales of tube forming products, internal high-pressure forming, tube forming products manufacturing, automobile exhaust manifold, tube hydroforming product technology, tube end forming, tube forming product equipment

The exhaust manifold is part of the exhaust system of an automobile.A turbocharged internal combustion engine with a turbocharger between the exhaust manifold and the front tube;There are also internal combustion engines that make a turbo and exhaust manifold into one assembly.Each branch of the exhaust manifold is connected to the exhaust port of the head of the internal combustion engine, while the total exhaust port (1 or 2) is connected to the supercharger

The advantages, functions, structural characteristics and failure forms of high pressure molding in automobile exhaust manifold are considered.In this paper, the present situation and development trend of materials used in the exhaust gas pipe in China are summarized, and the main production points of as-cast high ferritic ductile iron, vermicular cast iron, medium si-mo ductile iron and high Ni austenitic ductile iron exhaust manifold are pointed out.

Exhaust manifolds used in automobile engines are considered non-critical castings.Under the actual working conditions, the exhaust manifold of the engine has severe working conditions, and is in the state of cyclic alternating temperature, the heating temperature is not uniform, and the surface and internal cavity temperature are several hundred degrees different, so the exhaust manifold is required to have good mechanical properties and performance at high temperature.Since the 1970s, in order to protect the environment and save resources, in "improve the compression ratio, improve fuel combustion efficiency, reduce emissions" and other aspects, constantly put forward new requirements for automotive engines.This situation not only promoted the progress of automobile engine industry in various aspects, but also promoted the development of casting industry in production technology and casting material.In order to adapt to the requirements of continuous increase of engine exhaust temperature after the application of catalytic technology and worm gear supercharging technology, new materials for heat-resistant exhaust manifold need to be developed to adapt to the improvement and improvement of engine performance, and to strengthen the research and development of optimizing product functions and reducing production costs.Characteristics of exhaust manifold materials and requirements early automotive engines had low power per unit weight, low fuel combustion efficiency, and exhaust gas temperatures not exceeding 500 ° c.