CALCULATION OF FORCES FOR FORMING OF AIRCRAFT PANELS BY SEQUENTIAL WHEELING ON SPECIALIZED EQUIPMENT
Abstract
The design of a modern aircraft provides for a high degree of panelizing of outline elements which can reach up to 80...85%. This allows to increase strength and rigidity with a simultaneous reduction in weight and improved flight performance of the product by reducing the number of fasteners and riveted seams. Also, the improvement of parameters occurs due to the use of high-strength aluminum and other alloys. However, the manufacture of such panels is time consuming and requires special equipment. At a time when technologies and equipment for the manufacture of single-curvature panels are fairly well developed, it is still difficult to manufacture panels with variable twist (washout) of cross-sections on the existing universal equipment with the prescribed accuracy. Basically, for the manufacture of such panels free bending, requiring a large number of finishing works is used. The use of universal equipment such as Sheet Stretch Forming Press is also not sufficiently effective, since the form die produced individually for each part and has a high price. To overcome the existing shortcomings it is proposed to use a multi-point controlled roller punch and a die, the shape of which is set by the CNC device according to information from a digital mock-up. A design diagram for determining the acting forces on the rollers of a multipoint punch during the sequential formation of the workpiece was developed. A method for calculating the technological parameters of the panel forming process is presented. It allows to determine, in particular, the total force required to feed the rollers of multi-point punch, the values of the transverse compensation angle of the rollers of multi-point punch and the number of deformation strokes. The initial data for the implementation of the process are determined, the scheme of the process of forming a panel with variable twist is described. An example of solving the problem of determining the technological parameters of the process of forming a panel on the proposed equipment by the proposed method is given.
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DOI: https://doi.org/10.32620/oikit.2019.85.03
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