МОДЕЛЮВАННЯ ТЕПЛОВИХ ПРОЦЕСІВ В ТЕХНОЛОГІЧНИХ СИСТЕМАХ З ВИКОРИСТАННЯМ МЕТОДУ ДЖЕРЕЛ

Abstract

A source or drain of any shape, whether moving or stationary, acting temporarily or permanently, may be represented as a system of point instantaneous heat sinks (drains). This provision is called the principle of designing solutions. The process of heat propagation in a body of limited size can be represented as the process of heat propagation in an unlimited body, if the actual sources are supplemented by some system of dummy sources or heat sinks. The algorithm developed is as follows. The forces acting on turning on the front and back surfaces of the cutter are calculated. At external longitudinal turning of structural steel, tangential Pz and radial Py are the components of the cutting force. Calculate the dimensions of a flat source of heat on the front surface of the cutter, the flat area of the contact of the chips with the front surface. Calculate the temperature at the tip of the cutter with constant heat exchange. As a result of the research, the substantiation of the concept of mathematical model for use in the execution of turning works is offered, where the choice of such cutting modes is important so that, with the known characteristics of the material being processed, the temperature of the cutter does not exceed the maximum possible. This in turn provides effective planning and cost-effectiveness of the cutter. All this allows you to adjust the modes and costs in the work developed a calculation algorithm for the given processing conditions - properties of the machined and tool materials, geometric parameters of the tool and cutting modes to determine the temperature at the top of the lathe using the source method. The scientific novelty is to use the known method of heat sources for the calculation of a specific technical problem: the calculation of the temperature of the tip of the cutter when processing a specific part The practical importance of the work lies in the possibility of using the developed algorithm in practice in the manufacture of specific parts, because it is known that exceeding a certain temperature of the cutter can lead to sad results. The work can also be used in the educational process for students studying heat engineering