A method of manufacturing a tubular stainless steel manifold

Abstract

The invention discloses a manufacturing method for a tubular stainless steel manifold. To solve the problems existing objectively in a traditional technology process, the manifold is designed according to engine boundary conditions and the overall exhaust system trend, and the manufacturing method comprises the two steps of part manufacturing and manifold welding; on one hand, the manifold has excellent formability, the trend of the manifold can adapt to the requirements of various complex spatial angles, and the manifold is easy to machine; on the other hand, from part machining to welding forming, welded joints of the stainless steel manifold are high in quality, the dimensional accuracy of the tube diameter is high, welds do not crack, and stability is high; moreover, the strength of the welded joints satisfies the requirement of cold machining and can satisfy the usage requirement of the manifold in a high-temperature environment; besides, the manifold is high in oxidation resistance, good in high-temperature-resistant strength and excellent in thermal fatigue property, thereby having good market prospects.

Description

technical field [0001] The invention relates to the technical field of manufacturing methods for exhaust manifolds, in particular to a method for manufacturing tubular stainless steel manifolds. Background technique [0002] Tubular stainless steel manifold is welded by stainless steel seamless pipe or stainless steel welded pipe. The inner wall is smooth, the pressure loss is small, and it is convenient for engine power; ;The wall is thin and the temperature rises quickly, and the ignition temperature of the catalyst can be reached quickly when the engine is started, and the conversion efficiency of the catalyst under low temperature conditions can be improved, so it has been widely promoted and used now. The overall stamping results in a high partial thinning rate of the material, which makes the strength of the exhaust manifold insufficient. At the same time, due to the complex structure, it also makes welding inconvenient, the manufacturing process is not good, the manuf...

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Problems solved by technology

[0002] Tubular stainless steel manifold is welded by stainless steel seamless pipe or stainless steel welded pipe. The inner wall is smooth, the pressure loss is small, and it is convenient for engine power; ;The wall is thin and the temperature rises quickly, and the ignition temperature of the catalyst can be reached quickly when the engine is started, and the conversion efficiency of the catalyst under low temperature conditions can be improved, so it has been widely promoted and used now. The overall stamping results in a high partial thinning rate of the material, which makes the strength of the exhaust manifold insufficient. At the same time, due to the complex structure, it also makes welding inconvenient, the manufacturing process is not good, the manufacturing efficiency is not high, and it will have adverse effects on product reliability. influences

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