ФОРМОУТВОРЕННЯ НАМОТУВАННЯМ АНІЗОГРИДНИХ КОМПОЗИТНИХ СІТЧАСТИХ КОРПУСНИХ КОНСТРУКЦІЙ ЛІТАЛЬНИХ АПАРАТІВ

Abstract

The process of modeling the trajectory of laying the reinforcing material (RM) during the formation of anisogrid composite mesh hull structures (MHS) has been developed. The paper gives a brief description of the types of aircraft structures of complex shape according to the criterion of the possibility of manufacturing by winding, in which certain types of surface shapes are distinguished from the condition of determining the laying trajectory and developing a winding control program (WCP) for CNC machines. It is shown that the process of developing manufacturing technology for structures of complex shape (SCS) has significant differences from the process of developing technology for axisymmetric products. The general technique for determining the trajectory of laying the reinforcing material is shown and new approaches to setting the reinforcement scheme are described. A general method for calculating the WCP for winding SCS is described. Calculation of displacements of the working bodies of the winding machine (WM) includes several subtasks: choosing the sequence of individual turns of the RM, calculating the displacements of the working bodies of the WM when laying each turn, and determining the transition program from turn to turn. It is shown that the most important stage in the development of a general type of SCS winding technology is the choice of a winding scheme that determines the structural power scheme (SPS) of the structure. For this, the concepts are introduced - the base point and the base angle of reinforcement. The winding scheme of any type of products can be described using an array of base point coordinates and base reinforcement angles. An algorithm for calculating the RM stacking trajectory on the mandrel surface is presented. The features of the choice of the order of the turns are described. The order of the turns affects the number of weaves in the structure of the composite material obtained during the winding process and the strength of the resulting product. The optimal sequence of turns according to the strength criterion is determined experimentally by repeated development tests. The features of the choice of programs for the transition from coil to coil are described. The algorithm of actions of the WM during the transition from one turn to another - the transition program consists of two programs: the program for entering the coil and the program for exiting the coil. The algorithm of the transition programs depends on the chosen order of the turns and, in each particular case, depends on the design features of the product. To test the developed methodology, a trial calculation of a general hull SCS was carried out. As a result of the work done, it was possible to solve the problem of the process of modeling the RM laying trajectory for bodies of complex shape with a fixed type of section, made by winding from a polymer composite material (PCM). This technology can be used to produce aircraft structures such as the "wing", "fuselage" of an aircraft, etc. Thus, the possibility of winding SCS of a general type has been proved using the example of mesh hull structures. As a result, the range of production of coiled products has expanded - bodies with an arbitrary convex section and a straight generatrix.