Low-alloy high-strength steel automobile rear bumper beam and manufacturing method thereof

Abstract

The invention relates to a back bumper beam of a low-alloy high-intensity steel vehicle; the body of the beam is an integral component for steel plate shaping with a 'U'-shaped transverse section; the mounting hole and the reinforcing ribs of the sleeve of a tow hook are arranged on the body of the beam. The invention is characterized in that the material of the body of the beam is the low-alloy high-intensity steel, the components of which includes that the content of C is less than or equal to 0.2 percent, the content of Mn is less than or equal to 2 percent, the content of P is less than or equal to 0.03 percent, the content of S is less than or equal to 0.03 percent, the content of Alt is more than or equal to 0.02 percent and the content of Nb is less than or equal to 0.9 percent; besides, the anti-tension intensity of the steel is larger than 590 MPa. The manufacture method of the beam includes the following steps of: extending and shaping to obtain the blank of the body of the beam, the left and right ends of which are provided with the reinforcing ribs and the transverse section of which is 'U'-shaped; cutting the edge and punching: punching the mounting hole of the sleeve of the tow hook in the blank of the body of the beam and cutting off the redundant plate materials; rolling and shaping: shaping the blank of the body of the beam into the size of a finished product. The invention organically combines extending and shaping and ensures the precision after being shaped by a shaping tool; the product not only can completely meet the intensity requirement of the back bumper beam of the vehicle, but also can realize batch manufacture as well as reduce cost.

Description

technical field [0001] The invention relates to auto parts and a manufacturing method thereof, in particular to a low-alloy high-strength steel automobile rear bumper beam and a manufacturing method thereof. Background technique [0002] The rear bumper of a car includes a decorative panel, a bar beam and connecting parts. The beam of the rear bumper of the car is one of the safety parts. It provides a strong guarantee for the safety of the fuel system at the rear of the car body when the car collides. Due to its high strength, the selection of its original material and molding process is very critical. Many OEMs generally use thermoforming materials and thermoforming processes to manufacture rear bumper beams. Thermoforming material - boron steel has low strength before heating (generally 400-600MPa). After heating, its strength decreases and its plasticity increases. It can be pressed and formed into complex part shapes and stable outline dimensions. While forming, rely ...

AI Technical Summary

Problems solved by technology

Due to the use of thermoforming materials and thermoforming technology, the cost of molds is high, the process is not easy to control, it is difficult to achieve mass production, and

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