Method for processing catalytic converter for automobile

Abstract

The invention discloses a method for processing a catalytic converter for an automobile. The method comprises the following steps: 1) rolling a cylindrical plate sheet according to the shape of the shell of the catalytic converter and rounding; 2) fixing the rolled cylinder (1) in the manner of direct seam welding; 3) cutting two ends of the welded cylinder to appointed length, and meanwhile, removing welding joints with flaws from two ends; 4) wrapping a gasket (2) onto a carrier (3) by using an adhesive tape; 5) pressing the wrapped carrier (3) into the cylinder (1); 6) performing flow forming on the cylinder (1) by using a spinning fixture; and 7) performing a thrust displacement test on a formed catalytic converter assembly subjected to flow forming. The catalytic converter of the specific structure has the beneficial effects that flow forming end conical forming is performed on the two ends of the shell after the carrier and the gasket are pressed into the shell, thereby reducing the cost increase caused by end conical design and mould opening, omitting an end conical girth welding process and a necking down process in process aspect; and by the adoption of the catalytic converter, a compression gap of the gasket can be well ensured, the risk of carrier breaking is reduced, and mechanical durability of the catalytic converter is improved..

Description

technical field [0001] The invention relates to an automobile post-treatment exhaust system, in particular to a processing method for an integrally formed catalytic converter. Background technique [0002] The main body of the catalytic converter mainly includes a carrier, a liner, a shell, and a cone end. The traditional manufacturing process of a bundled catalytic converter is to first package the carrier, liner, and shell and then weld the end cone, which has complex processes and high costs. Defects, as follows: [0003] Complex structure: In addition to the design of the carrier, liner, and shell parts, the bundled process also needs to design the end cone of the catalytic converter separately. In addition, in order to prevent the air flow from blowing the liner, the shrinkage design of the shell needs to be considered , and the installation and matching design of the end cone and the shell, resulting in a complex structure and a variety of design contents. [0004] T...

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Problems solved by technology

[0002] The main body of the catalytic converter mainly includes a carrier, a liner, a shell, and a cone end. The traditional manufacturing process of a bundled catalytic converter is to first package the carrier, liner, and shell and then weld the end cone, which has complex processes and high costs. Defects, as follows:

[0003] Complex structure: In addition to the design of the carrier, liner, and shell parts, the bundled process also needs to design the end cone of the catalytic converter separately. In addition, in order to prevent the air flow from blowing the liner, the shrinkage design of the shell needs to be considered , and the installation and matching design of the end cone and the shell, resulting in a complex structure and a variety of design contents

[0004] There are many processes: the bundled catalytic converter needs to be stamped and formed except for the shell and the end cone. The assembly includes the bundled carrier, straight seam welding, circular seam welding and other processes, especially the uneven distribution of the gap at the edge of the shell. The shrinking process is very easy to cause the carrier to be broken, the process steps are numerous, and the investment in equipment is large

[0005] There are many welding parts: the bundled catalytic converter process needs to purchase the end cone separately, and the cost of parts procurement is high; the welding part includes two parts: straight seam welding and circular seam welding. The welding process of the body girth weld is prone to liner ablation, increasing the risk of liner failure and increasing the overall manufacturing cost

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