Manufacturing process of stainless steel bent tube type exhaust manifold

Abstract

The invention discloses a manufacturing process of a stainless steel bent tube type exhaust manifold. The manufacturing process comprises the following steps: cutting a stainless steel coiled sheet to steel belts with the corresponding width according to the diameter of the exhaust manifold to be manufactured; performing cold roll forming on the steel belts on a pipe welding machine to obtain pipe billets; using a solid-state high frequency welder to weld the seams of the pipe billets and obtain a straight seam raw material long pipe, wherein the welding frequency of the solid-state high frequency welder is 150-300KHz and the walking linear velocity of the pipe billets is 60-80m / min; cutting the raw material long pipe to raw material short pipes with the corresponding length according to the length of the exhaust manifold to be manufactured; processing the raw material short pipes on a machine tool to form plug-in installation sections and sealing slope sections and obtain exhaust manifold billets; and bending the exhaust manifold billets on a bending machine to obtain bent tube type exhaust manifolds with the required shape. The consumable material of the manufacturing process is less; and the manufactured bent tube type exhaust manifold has the advantages of high heat-conducting efficiency, oxidation resistance, high temperature strength, low thermal fatigue and the like.

Description

technical field [0001] The invention discloses a manufacturing process of a stainless steel elbow type exhaust manifold. Background technique [0002] With the further tightening of environmental protection regulations, vehicle exhaust emissions are one of the important sources of air pollution. Under such circumstances, purifying exhaust gas from automobiles, reducing body weight, reducing fuel costs, and protecting the environment are undoubtedly the social missions that automobile manufacturers should undertake. In order to accomplish this mission, automobile manufacturers must have higher and higher requirements on the characteristics of materials used in the production of automobiles. It can be said that the stainless steel of the automobile exhaust system has been basically realized, but in the future, the use of materials with high performance and lower price will be the development trend of the stainless steel of the automobile exhaust system. Its emission control ...

AI Technical Summary

Problems solved by technology

[0004] The current exhaust manifold and three-way catalytic converter housing are cast in one piece. The exhaust manifold is a thick-walled structure. The wall thickness of the exhaust manifold is 5-6mm, which is heavy and consumes a lot of materials.

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