Abstract
Abstract. The article presents the results of research in the direction of improving technological equipment for internal threading of parts in a flexible automated production. Methods for assessing the operational and technological reliability of a flexible manufacturing module (FMM) of thread processing are considered, which can be used as the basis for the developed method of synthesis of its elements. It is proposed to consider the technological system of the flexible manufacturing module (FMM) of thread processing as a system in which transitions from state to state occur under the action of the simplest flows with parameters of the transition probabilities of a continuous Markov chain. The developed mathematical model describing the state of the FMM taking into account the failures of the functioning of its elements, parametric failures, as well as taking into account the recovery after these types of failures, makes it possible to reflect the influence on the operation of the module of the parameters of the flows of failures and restorations of the tool, machine tool, fixture, loading device. The solution of the obtained systems of equations of final probabilities allows for given (or experimentally obtained) intensities of failure streams (functioning and parametric) for FMM threading to obtain the values of the probability of failure-free operation, as well as the probabilities of finding the system in an inoperative state due to corresponding failures. The measures taken make it possible to solve the synthesis problem at the level of structural and layout optimization, so that at the stage of parametric synthesis to determine the elements that are vulnerable according to the developed criterion, the improvement of which will lead to the creation of the most efficient system.
Highlights
The creation of effective technological equipment for flexible manufacturing modules (FMM) for automated thread processing based on such modern technological elements as a machine tool, a tool, a fixture, a loading device should be carried out at the level of new requirements and is associated with obtaining an economic effect by increasing processing productivity and improving the quality of products
When creating elements of flexible manufacturing modules (FMM) for small-sized internal threading, one should take into account the effect of failure streams on the output of the system
Summary The carried out theoretical studies made it possible to develop a mathematical model for describing the states of the FMM thread processing, taking into account the failures of functioning and parametric failures of its technological elements, as well as recoveries after these failures
Summary
The creation of effective technological equipment for flexible manufacturing modules (FMM) for automated thread processing based on such modern technological elements as a machine tool, a tool, a fixture, a loading device should be carried out at the level of new requirements and is associated with obtaining an economic effect by increasing processing productivity and improving the quality of products. To describe the labeled graph of states of the technological system of FMM threading, taking into account the failures of functioning (Fig. 1), we denote: P0 – is the probability of the correct operation of the module, P0=P (S0); P1, P2, P3, P4 – respectively, the probability of breakage (failure) of the tool, machine elements and threading head, fixture, loading device.
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