Method for bending rear crossbeam of heavy truck and bending die

Abstract

The invention relates to a method for bending a rear crossbeam of a heavy truck. The method comprises the following steps that: a bending die which is debugged to be qualified is arranged on a press; two positioning holes on a punched blank pass through two positioning pins on the upper surface of an ejector so that the blank is placed on the ejector of a lower die of the bending die; and a working pushbutton of the press is pressed so that a male die of the bending die moves downward along with a sliding block of the press, the bending force acts on the blank in a direction vertical to the horizontal plane, and the blank is pressed by the bending force and the ejector of the bending die so as to move downward and enter a cavity of a female die of the bending die, the sliding block of the press moves downward to the bottom of the female die of the bending die, the blank is formed in the female die of the bending die, the sliding block of the press moves upward, the ejector of the bending die, a bent part and the male die of the bending die synchronously move upward to the position before bending, the male die of the bending die and the bent part are separated, and the wing surface and the bottom surface of the rear crossbeam are in an ideal state due to the rebound of a steel plate. Meanwhile, the invention also discloses the bending die matched with the method.

Description

technical field [0001] The invention relates to a vehicle component processing method and a mold, in particular to a bending method and a bending mold for a rear beam of a heavy truck. Background technique [0002] The rear beam of a heavy-duty tractor requires an irregular U-shaped piece with an angle between one wing surface and the bottom surface of 90°, and the angle a between the other wing surface and the bottom surface is greater than 90°. The height of the two wing surfaces is greater than 250mm. The steel plate used for the girder has a material thickness of 6 to 10 mm. The usual bending method is: the bending blank is placed horizontally on the top part of the bending mold. When bending, the bending force is perpendicular to the bottom surface of the beam. Since the rear beam is an irregular U-shaped piece, the force on the two airfoils is asymmetrical, resulting in different springbacks on the two airfoils, difficult mold debugging, and difficult and serious sprin...

AI Technical Summary

Problems solved by technology

Since the rear beam is an irregular U-shaped piece, the force on the two airfoils is asymmetrical, resulting in different springbacks on the two airfoils, difficult mold debugging, difficult and severe springback, which affects the assembly cycle of the frame and the quality of the vehicle

Images