Actual Problems in Machine Building 2020 Vol. 7 No. 3-4

Актуальные проблемы в машиностроении. Том 7. № 3-4. 2020 Инновационные технологии в машиностроении ____________________________________________________________________ 17 GRINDING COMPENSATION FOR GRINDING DEEP HOLES Salov P.M. , D.Sc. (Engineering), Professor, e-mail: salov-pm@yandex.ru Borisov M.A. , Ph.D. (Engineering), Associate Professor, e-mail: borisovmgou@mail.ru Terentiev E.A. , Senior Lecturer, e-mail: Genya_ms@mail.ru I. N. Ulianov Chuvash State University, 15 Moskovsky Prospekt, Cheboksary, 428015, Russian Federation Abstract The paper outlines the problem associated with the low efficiency of the process of internal grinding of deep holes. The analysis of studies on this problem is carried out. In practice, it is accepted that when the interference in the technological system changes, the circle and the workpiece do not move relative to each other. Most theoretical studies also have a significant drawback - they do not take into account constantly changing deformations in technological systems, which in the process of dressing and grinding change the position of the contacted bodies. Changing the relative position of the circle (workpiece) and the workpiece (circle) violates the congruence of the contact lines (zones). Uneven load in the field of theoretical contact violates the stability of the grinding process and the entire operation as a whole. The essence of the proposed processing method is as follows: such a working surface is formed on a circle that, when loaded with the required quasi-constant forces, it provides a contact zone congruent with the surface of the hole, supported by longitudinal and transverse feeds. It has been established that long-term maintenance of process stability is possible with elbor grinding in the regime of stable self-grinding circles. The conditions under which the proposed method is most effective are determined. To implement the method were determined: the rigidity of the technological system, cutting forces, process parameters, accuracy and quality characteristics of the treated surfaces. The conditions for editing circles with the calculated angle of inclination of the generator φ, which is the final parameter necessary for the implementation of the method, were worked out. Compensation of deformations for turning the generatrix of the circle to the position when it becomes parallel to the longitudinal axis of the hole is realized due to the transverse feed supporting the required cutting power. Keywords Deep holes, limited stiffness, strain compensation, elbor circles, stability conditions