Passenger car framework aluminum alloy profile extrusion and bending integrated forming method

Abstract

The invention relates to a forming method in the technical field of plastic processing, in particular to a passenger car framework variable-cross-section aluminum alloy profile extrusion and bending integrated forming method. A conventional extruder discharging port is refitted into a plum blossom shape, a four-roller wheel device is installed at the discharging port, an aluminum alloy blank is subjected to hot extrusion to form a profile, the profile directly enters into a roller wheel mechanism which is already installed before cooled, the variable-cross-section profile is firstly clamped and guided by the two roller wheels close to an outlet according to a set program, a bending moment is applied to the profile by the rear two roller wheels, and bending forming is achieved. Corresponding different rollers can further be machined, so that the rollers can better fit profiles, processing is facilitated, and precision is guaranteed. The roller wheels are continuously moved to a plurality of set positions and stay for corresponding time, during which an extruded profile passes between the roller wheels at a relatively fixed speed to achieve variable-radian bending deformation in an extrusion direction. The method is high in production efficiency, high in process precision and low in cost.

Description

technical field [0001] The invention relates to a forming method in the technical field of plastic processing, in particular to an extrusion-bending integrated forming method for aluminum alloy frame profiles of passenger cars. Background technique [0002] The modern automobile industry revolves around the themes of safety, energy saving and environmental protection, and the lightweight of automobiles has become the trend of the development of automobiles in the world. However, the weight reduction of automobiles must reduce the mass as much as possible on the premise of ensuring the safety performance of the automobile, so as to improve power performance, reduce fuel consumption, and reduce exhaust pollution. Passenger cars occupy a large proportion in public transportation, and have the advantages of large passenger capacity, flexibility, convenience, and low cost, and their status is important. However, the accident probability of passenger cars is relatively high, and ...

AI Technical Summary

Problems solved by technology

However, at present, the manufacturing process of aluminum alloy is mainly based on casting and extrusion, followed by secondary processing methods such as stamping and bending. The two-step process of extrusion and bending is the general division of the traditional process of producing metal curved profiles, and the bending process has a great impact on production costs. play a dominant role

Nowadays, some processes such as press bending, coil bending, and stretch bending can be used to bend profiles. However, due to the complex structure of metal profiles and the multi-rib section and thin wall, springback, cross-sectional distortion and surface scratches are prone to occur in the traditional bending forming process. and other defects, while requiring large-scale equipment, resulting in high cost and low production efficiency, which has become one of the bottlenecks restricting the lightweight of automobile body structures. Therefore, it is of great practical significance to study the new bending forming process of metal profiles

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