Manufacturing method for main beam capable of improving overall NVH capacity of automobile

Abstract

The invention relates to the field of automobiles and automobile part manufacturing, in particular to a manufacturing method for a main beam capable of improving the overall NVH capacity of an automobile. The maximum specific content of the lubricating oil and the extremely low cost are defined, and after heat treatment is carried out in the manufacturing process of the main beam, a special oil film layer is formed on the inner wall of the main beam to separate the front layer from the rear layer which are attached to each other, so that abnormal sounds caused by the main beam structure are basically eliminated. The method comprises the following steps that 1, a corresponding main cross beam is manufactured, and the structure of the main cross beam mainly corresponding to the technical range comprises a front plate and a rear plate, and the re-extrusion expansion section of a lower beam is V-shaped, C-shaped, U-shaped, arc-shaped, L-shaped, U-shaped, L-shaped and the like; the distancebetween the folded top plate overlapping position of the front plate and the rear plate and the inner wall of the expanded lower plate is not equal to 0 mm but smaller than 2-0.2 mm of the contact distance in the whole top plate overlapping position or in the most central part of the top plate overlapping position.

Description

technical field [0001] The invention relates to the field of manufacturing automobiles and automobile parts, in particular to a method for preparing a main beam for increasing the overall NVH capability of a vehicle. Background technique [0002] In the main beam technology of the prior art, the main beam is often caused by the extrusion force caused by the front and rear setbacks of the vehicle, the torsional force of the left and right forms or emergency steering, the uneven ground or large potholes and stones. When these forces are transmitted to the main girder, because the main girder is hollow, the sound of incoming sound, friction of components, and high-speed flowing wind will generate wind noise or Because of the friction of its own internal structure, etc.; these reasons directly produce various abnormal noises such as the connection with the longitudinal beam, such as the installed parts, and these abnormal noises are a very core part of the overall NVH capability...

AI Technical Summary

Problems solved by technology

[0002] In the main girder technology of the prior art, the main girder is often caused by the extrusion force caused by the front and rear setbacks of the vehicle, the torsional force of the left and right forms or emergency steering, the uneven ground, or large potholes and stones. When these forces are transmitted to the main girder, because the main girder is hollow, the sound of incoming sound, component friction, and high-speed flowing wind will generate wind noise or Because of the friction of its own internal structure, etc.; these reasons directly produce various abnormal noises such as the connection with the longitudinal beam, such as the installed parts, and these abnormal noises are a very core part of the overall NVH capability of the vehicle. Important performances such as vehicle purchase, ex-factory quality, and comprehensive evaluation, among ordinary vehicle users, it is common that the chassis of the vehicle will produce various regular or irregular abnormal noises when the vehicle is running. Although the frequency of abnormal noise problems is low, customers complain Strong, the problem needs to be solved urgently. These abnormal noises reveal that the design or adjustment of parts in a certain area of ​​the vehicle has not passed the test. Also because of these abnormal noises, it is necessary to enter the 4S shop for maintenance or maintenance. In serious cases, a large number of vehicles need to be replaced. The large-scale recalls of vehicles and the overall situation are very serious matters for automobile manufacturers. Enhancing the overall NVH capability of vehicles has always been the direction pursued by the field of automobile manufacturing technology

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