Fojtu O. Improvement of technology of aircraft longitudinal frame members manufacturing using high-speed processing on CNC machine tool

The object is a technological process of high-speed processing of a longitudinal power set; the purpose of research - is to increase the productivity and quality of the manufacture of CNC machine tools for the elements of the aircraft longitudinal power set by applying the method of contour feed and cutting speed adaptive control; used methods of aircraft technology, experimental planning, and also the information systems theory; the results - the software-hardware complex integrated into the CNC system was developed and allows to collect the objective data for the CNC machine tool study, using the adaptive control method allows to eliminate the effect of sticking material and provide increasing in the production performance of aircraft wing's longitudinal power set on CNC machine tool in 2 times after machine tool FP-7SMN2 modernization. An improved adaptive control method allow to form an smooth S-shaped acceleration/deceleration law with speed, acceleration, jerk and the rate of jerk constraints, reduce processing time, compared with modern systems equipped with a Heidenhain iTNC530 control system, from 3 to 10%; the novelty - a mathematical model for the formation of a law for changing the contour feedrate ensures the smooth change of speed, acceleration, jerk and the rate of jerk variation based on trigonometric functions is developed, unlike the well-known mathematical models which provide smoothness speed and acceleration only; the concept of contouring feedrate planning has been improved, which, unlike the well-known concept of operational planning (look ahead), does not have limitations on the number of frames considered and the time for performing the analysis; the contouring feedrate and cutting speed adaptive control method is developed on the basis of application of the S-shaped acceleration/deceleration law; the degree of implementation - implemented at enterprises "PP Plastar" (act from 7 november 2016), LLC "Voshod Liz" (act from 12 december 2016), at M. Ye. Zhukovsky National Aerospace University “Kharkiv Aviation Institute” (act from 20 december 2016) and at the Kharkov State Aircraft Manufacturing Company (act from 12 december 2016); the field of uses - aircraft production and other branches of mechanical engineering.