Packaging process for three-way catalytic converter

Abstract

The invention discloses a packaging process for a three-way catalytic converter, which relates to the technical field of mechanical manufacture, and aims to solve the technical problems that the bonding type has defects in the production of the three-way catalytic converters according with Europe IV standard. The flow of the packaging process comprises: 1) measuring the outside diameter of a carrier and the weight of a pad; 2) packaging the carrier first and favorably attaching the packaged pad to the carrier, and then pressing the packaged pad into the shell by a power source; 3) performing multiple contraction on workpieces by an outside diameter contracting device of the three-way catalytic converter on the basis of data obtained by measuring the outside diameter of the carrier and the pad; 4) flaring two end ports of the workpieces without damaging the carrier, and keeping the flared end surface straight to ensure that the space between two annual welding seams is consistent and equal; and 5) performing assembly welding, namely respectively inserting two end cones into flares at two ends of the workpieces and welding the flares along the end surfaces of the flares. The packaging process for the three-way catalytic converter has the characteristics of strong adaptability, even contraction and deformation, can avoid the breakage of the carrier and the damage of the pad, and has good circularity of the appearance.

Description

technical field [0001] The invention relates to mechanical manufacturing technology, in particular to a manufacturing packaging process for a three-way catalytic converter used for automobile exhaust emission treatment. Background technique [0002] Automobile exhaust is the main source of air pollution in modern cities. To reduce pollution emissions, it mainly relies on the installation of three-way catalytic converters containing catalysts to turn CO, HC, NOx, and other harmful gases into gases suitable for discharge into the atmosphere. [0003] In order to realize its commitment to the "Kyoto Protocol", the EU requires all countries to reduce greenhouse gas emissions, mainly vehicle exhaust, within a time limit. In accordance with the promise of a green Olympics, Beijing has implemented Euro IV emission standards before the 2008 Olympic Games. It can be seen that it is the trend of the times for my country to gradually expand the scope of implementing the Euro IV standa...

AI Technical Summary

Problems solved by technology

[0008] 3. Bundle spot welding; in the process of bundling workpieces (such as figure 2 As shown), due to the uneven pressure on the circumference of the carrier, it will cause damage to the carrier, and the gasket will deform unevenly in the circumferential direction

[0009] The binding type is based on the estimated binding force as a unified binding force, so that the three-way catalytic converter liner shrinks, but due to the error in the manufacture of the carrier, the size of the carrier changes, and the three-way catalytic converter whose diameter changes when the uniform binding force is used Pads produce different compression and vary widely

[0010] 4. Closing station; when the workpiece is closed (such as image 3 As shown), the degree of closure varies with the individual in the parameters of roundness and total length, which will cause hidden dangers in the future welding of girth welds

[0011] 5. Welding station; (such as Figure 4 As shown) due to the change of shrinkage when the workpiece is closed, the distance between the two circular welds is uncertain and changing during assembly welding. Therefore, the position of the welding torch needs to change with each workpiece, and measurement and tracking are required, which makes the equipment too Complicated, the welding torch cannot be positioned well, resulting in welding defects, and welding defects are prone to appear at the lap joint of the shell when welding the circular weld

[0013] 1. Defects that cannot be changed according to each carrier liner;

[0014] 2. The outer roundness of the cylinder is not good;

[0015] 3. It is easy to damage the liner when binding;

[0016] 4. The liner is not uniformly deformed during bundling, the carrier is not evenly compressed, and the carrier is easily broken;

[0017] 5. Inconsistent shape changes when closing;

[0018] 6. Straight welds during welding can easily lead to welding defects, and repair welding is required. There are air bubbles, and welding defects are prone to appear in the places where the edges overlap;

[0019] 7. Due to the change in size after closing, the position of the welding torch is not fixed during welding, and frequent adjustments are required, which is prone to welding defects

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