Hot-stamped B pillar, and forming technique thereof

Abstract

The invention discloses a hot-stamped B pillar. The B pillar comprises a plate, wherein a top mounting part and a bottom mounting part are respectively arranged at the top and the bottom of the platethrough integral forming; and a first trapezoidal frame, a waist-shaped frame, a hinge, a rectangular frame and a second trapezoidal frame are sequentially arranged below the top mounting part. The hot-stamped B pillar disclosed by the invention has the advantages that spring-back of parts can be effectively prevented, so that the part strengths are greatly improved, the plate thickness is reduced, and the lightweight effect is obvious; the flow of cooling water in a hot forming mold is changed to control the part cooling speed, so that quenching heat treatment and part forming can be completed simultaneously; the plate and reinforcing ribs are firstly connected through spot welding and then go through hot forming, so that a technique is simplified, and energy consumption is reduced; the adopted plate is a galvanized plate, so that oxidation can be effectively prevented during heating, a shielding gas is dispensed with, and surface treatment is not required after the forming; and CAE forming simulation analysis on the plate shape is carried out beforehand, so that trimming allowances are avoided after the forming, laser cutting treatment is not required, and material consumption isreduced.

Description

technical field [0001] The invention belongs to the technical field of B pillars, and in particular relates to a hot stamping formed B pillar. At the same time, the present invention also relates to a forming process for forming the B-pillar by hot stamping. Background technique [0002] The lightweight of the car is conducive to improving the power, comfort and handling stability of the car. On the premise of ensuring the strength and safety performance of the car, it can reduce the curb quality of the car, thereby improving the power of the car, reducing fuel consumption and reducing exhaust pollution. , is an important direction for the development of automobile technology. [0003] The use of lightweight materials and corresponding molding processes is one of the most effective ways to achieve lightweight vehicles, and high-strength steel is one of the most promising lightweight materials for automotive applications. Although high-strength steel can significantly reduc...

AI Technical Summary

Problems solved by technology

The manufacturing method of non-equal plate is complex and requires high rolling equipment; and it needs two hot formings, which consumes a lot of energy and is not resistant to corrosion; and the reinforced tube is thicker, and the thinning effect is not obvious

[0007] For cold stamping B-pillars: cold stamping cannot be formed at one time, and preforming or progressive dies must be used. Multiple sets of molds need to be designed and developed, and the process is complicated; If it gets bigger, it is prone to hidden damage, cracking and other problems; after forming, the part has a large rebound and poor dimensional accuracy; the strength of the part is mainly increased by adding alloy elements or increasing the thickness of the sheet, which increases the material cost and part weight

[0008] For the B-pillar formed by hot stamping: the use of non-equal thickness plates requires high requirements for rolling equipment and low yield; the main body of the B-pillar and the reinforcement plate are formed separately, which increases energy consumption and processes; Oxidation requires protective gas, and shot blasting is required after the parts are formed

Images