Automobile B-pillar and manufacturing method

Abstract

The invention relates to an automobile B-pillar and a manufacturing method. The automobile B-pillar comprises a B-pillar body, and is characterized in that the top, the bottom and the middle of the B-pillar body are a first thickness area, a second thickness area and a third thickness area respectively, transition areas are arranged between the first thickness area and the third thickness area as well as between the second thickness area and the third thickness area; the thickness of each of the first and second thickness areas is 1.2mm, the thickness of the third thickness area is 1.7mm, and each transition area is reduced gradually from the thickness of the third thickness area and the thickness of the first and second thickness areas; the height of the first and second thickness area accounts for 1 / 4-1 / 3 of the height of the B-pillar body, and the height of each transition area is about 50mm; a reinforcement tube which is a hollow tube is arranged on the B-pillar body and made of ultrahigh-strength steel by a thermal forming process, and the wall thickness of the reinforcement tube is 1.5+ / -30%. Extremely complicated geometrical shapes can be produced according to the shape of the B-pillar, and the wall of the thermal-formed reinforcement tube is thinner.

Description

technical field [0001] The invention relates to an automobile B-pillar and a manufacturing method, belonging to the technical field of vehicle components. Background technique [0002] A car's B-pillar is the vertical beam on the car that sits between the front and rear seats of the cockpit and extends from the roof to the bottom of the car. The B-pillar not only supports the roof cover, but also bears the supporting force of the front and rear doors. Some additional parts are also installed on the B-pillar, such as the seat belts of the front seats, and sometimes the wiring harness. Therefore, most of the B-pillars have a convex radius to ensure better force transmission performance. The cross-sectional shape of the B-pillar of a modern car is relatively complicated, and it is welded by multiple pieces of stamped steel plates. With the development of automobile manufacturing technology, a closed cross-section center column that directly adopts hydroforming without welding...

AI Technical Summary

Problems solved by technology

The advantage of adopting the structure of B-pillar with variable thickness is that it can better protect the driver and passengers, and can achieve the purpose of deformation and energy absorption in the event of a collision; while the traditional method of welding steel plates with the same thickness has the following defects: (1) B-pillar and reinforced steel plates are generally cold stamped parts, which require new molds and welding tools; (2) cold stamped parts of the same strength are heavy and do not conform to the trend of lightweight; (3) B-pillars and reinforced steel plates are formed separately Matching welding is realized, the stability is not high, the quality control is difficult, and the scrap rate is high; (4) The strength of the upper and lower B-pillars is the same. When a side collision occurs, there is no energy-absorbing deformation part, and the huge impact force will endanger the safety of the driver.

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