Numerical-control flexible roll bending machine for three-dimensional variable-curvature sheet metal parts

Abstract

The invention discloses a numerical-control flexible roll bending machine for three-dimensional variable-curvature sheet metal parts. The numerical-control flexible roll bending machine comprises a base, a left machine frame, a right machine frame, a turnover device, a rigid roller, a flexible roller coated with polyurethane rubber, two side rollers, an upper roller supporting device, a side roller supporting device, a driving device, a lifting device and a dedicated numerical control system. The rigid roller, the flexible roller and the two side rollers are installed on the left machine frameand the right machine frame. According to the numerical-control flexible roll bending machine, the flexible roller is located under the rigid roller and connected with the lifting device, a rigid upper roller is connected with the driving device, the lifting device drives the flexible roller to ascend and descend, the driving device drives the rigid upper roller to rotate, the upper roller supporting device and the lower roller supporting device conduct reverse supporting on the rigid upper roller and two lower rollers, and the phenomenon that in the plate rolling process, all rollers are subjected to flexural deflection due to reactive force is eliminated; and by controlling the depth, pressed into the flexible roller, of the rigid upper roller and the feeding positions of the two side rollers, the parts subjected to double variable curvature roll bending are obtained.

Description

technical field [0001] The invention relates to the technical field of plate bending machine equipment manufacturing, in particular to a numerically controlled flexible bending machine for three-dimensional variable curvature sheet metal parts. Background technique [0002] There are many cylindrical and conical skin parts in the aircraft structure, which mainly constitute the aerodynamic shape of the aircraft fuselage or wing. Most of these parts are manufactured on the basis of rolling and auxiliary milling and other machining processes. made. The determination method of the traditional roll bending process parameters is based on experience or trial and error. In the actual part process, the process parameters are gradually adjusted and changed, and the roll bending is carried out. until the shape of the part matches the shape. Since three-dimensional variable curvature parts are parts whose curvature changes in both horizontal and vertical directions, it is extremely di...

AI Technical Summary

Problems solved by technology

At present, the existing two-roller flexible plate rolling machine is composed of a rigid roller and a polyurethane rubber flexible roller. Since the polyurethane rubber is an elastic medium, it produces a large friction force on the workpiece, so it can obtain higher precision and higher edge degree. Parts, and the curvature of the part can be adjusted according to the amount of sheet material pressed into the flexible roller. At the same time, it has the advantages of ensuring the outer surface quality, high efficiency and high efficiency when rolling the sheet material. However, when rolling some parts with higher specific strength, Due to the large springback, it is difficult to accurately control the precision of the part size and the operation is difficult

In addition, the four-axis roll bender can better control the dimensional accuracy of the parts through the position of the side rolls, and the four-roller roll bender has a high degree of automation, but it is prone to problems such as slipping and misalignment during roll bending

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