Actual Problems in Machine Building 2018 Vol. 5 No. 1-2

Actual Problems in Machine Building. Vol. 5. N 1-2. 2018 Innovative Technologies in Mechanical Engineering ____________________________________________________________________ 30 DEPENDENSE STRENGHT OF INTERNAL THREAD IN CARBON FIBERED PLASTICS FROM TECHNOLOGICAL PARAMETERS OF THE PROCESS ITS MANUFACTURE Markov A. M. , D.Sc. (Engineering), Professor, e-mail: andmarkov@inbox.ru Lebedev P.V. , Ph.D. (Engineering), Scientific associate, e-mail: pavel.lebedev@mail.ru Salman A. M., Ph.D. student, e-mail: azharmansoor76@gmail.com I.I. Polzunov Altai State Technical University, 46 Lenina avenue, Barnaul, Altai region, 656038, Russian Federation Abstract The article analyses factors influencing on internal thread’s geometric accuracy in carbon fiber details. The article describes the dependence of operating condition of thread cutting process and internal thread strength in view of physical and mechanical properties of material and specific defects, arising during carbon fiber processing. The necessity of using control methods of geometric parameters of turns of internal thread and holes for thread cutting, other than the conventional is stated. The authors offered a refined condition for the internal thread strength, taking into account the specific defects of the surface layer for carbon fiber processing. The methods for coefficient determination, considering load distribution on thread turns by means of finite element method are examined. Keywords Internal thread, internal thread strength, high-strength polymer composite materials, carbon fiber, thread cutting.