Investigation of the technological damageability of castings at the stage of design and technological preparation of the machine Life Cycle
Yaroslav Kusyi, Андрій Кук
Abstract
Abstract Solution of the problem of machines reliability requires new approaches which at the present stage of machine-building industry development is realized by implementing PLM - conceps (Product Lifecycle Management). The PLM - concepts are the system of management of the machine parts life with design of the functionally-oriented technologies of production by means of parallel engineering. Complex conditions of the products exploitation and complex technological processes of treatment require their profound theoretical and experimental investigation. An important task in the mechanical treatment and operation of products from the standpoint of their reliability is to predict their behavior at a certain point of time. The LM-hardness method developed under the guidance of academician A.A. Lebedev to control the samples structure quality and materials damageability in the investigated part of the samples is proposed. According to the LM-hardness method derivatives of the physical parameters absolute values, for example, dissipation of the obtained control results carried out by the same devices in identical conditions serve as the evaluation criterion. Homogeneity is a parameter that integrally describes the material state when processing the results of hardness control. The homogeneity is described by the Weibull coefficient m and the known Gumbel formula. In our researches we propose to evaluate the analysis of the material structure state both by means of the Weibull coefficient m, and its technological damageability W, which is inversely proportional to the Weibull coefficient. The experimental researches were carried out on aluminium alloy castings in sand moulds.Distribution of the technological damages W by the height of castings is established on the basis of performed researches at the stage of process engineering. The influence of the parameters of the “Sandvik” company tool design in treatment, using the “HAAS” treatment equipment on the change of the Weibull coefficient m is analyzed.