Movshuk Sergey Vladimirovich

Faculty: Mechanical

Speciality: Metal-cutting machine-tools and systems

Theme of masters works: «Development and explanation of adaptive technological tool set system for bore grinding»

Supervisor: Ph.D. technical sciences, assistant professor Poltavets Valery Vasilevich

AUTOBIOGRAPHYA

         The cardinal problems of the modern mechanical engineering are relate the receipt in the stage of making machine elements such characteristics of quality, which would satisfy the requirements to the service properties. At the same time it is necessary to exclude the formation causes of failures and to learn take part in formation of adjusted in advance of the performance attributes. It is known that the main cause of failure of machines is not breakage, and it is a wear of mobile couplings under the action of frictional forces. The wear-resistance of rubbing pairs, particularly, to a great extent is to take shape with the microrelief of the surface layers, which is received as a result of machining, and with the microhardness and residual stresses. It is the most complicated to control by process the formation of performance attributes of the machine elements, which is produced from inclined to phase transformation the material in the processes of mechanical machining, differing the high thermal tenseness. To such processes, first of all, the grinding is relate. There is arise the momentary contact temperatures in the work area, amounting to 800-10000C, and pressure, exceeding two-three times the yield strength of material.

         The purpose of master’s thesis is to increase the abrasive machining quality of thin wall production on the basis of the using ultrasound effects and to develop for ultrasound abrasive machining necessary technological provision, which will enable to machine the thin wall production. The aims are

Improving runout accuracy and finish of internal grinding by stabilizing force power parameters.

        ÏInfluence of the rigidity MCTC choice of circle rotary velocity in the inner grinding. At intragrinding machines mandrel, as one of the links in the technological system of MCTC, has a limited stiffness that - could be a cause of substantial fluctuations in circles. It is known that fluctuations in the tool, which is largely determined by the frequency of their rotation, in the process of cutting had a significant impact on the accuracy of the geometric shape and quality of the treated surface, as well as on the instrument performance. The paper states the principled choices speed range depending on the parameters of MCTC severity, but specific approach of solution is not reported. In this paper, an attempt to analytically determine the optimal frequency of rotation in the inner circle of grinding grinding, depending on the rigidity of the technological system of AIDS. When grinding the external load on the cutting grains and are characterized by short steps. They are quickly applied, and sometimes referred to impact loads, which gives rise to the outcome of theoretical mechanics vibration shock systems to the process. For the theoretical analysis will present a dynamic system intragrinding machine in the form of a mechanical model. Dynamic machine system consists of two vibrations systems, lap-poppet and processed billet front pastern machine. Accepted that the mass of the system moves only horizontally without friction, we consider the mass of the machine knucklebones a large displacement equal to zero. Since the modulus of the hard alloy components TC8 60 10 MPa, which is considerably higher modulus of elasticity Grinding wheels, share the details of deformation in the overall deformation of the contacts can be neglected. Due to the small surface of contact with a range of workpieces can be considered as ideal (zero mass) no damping's spring. In considering the first oscillatory system mass Grinding disk neglected because of smallness in comparison with the mass grandmother machine. The main influence on the accuracy of the holes in the grinding has a horizontal component of the efforts of cutting Ðy resulting shift in the axis range. It is 3-4 times more of the Ðz and in grinding is constantly changing, as it affects the forced oscillations of a technological system AIDS. The main sources for the latest in the diamond internal grinding of hard metal products, processed after sintering are no roundness imbalance and sintered billets, as well as grinding wheels. In connection with the grinding of small mass range (15-20 g) and a speed of treated parts (5-6s-1) the centrifugal forces that arise because of the imbalance is not addressed.