Investigation of the technological damageability of castings at the stage of design and technological preparation of the machine Life Cycle

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.

Influence of constructive and geometric parameters of the end cutters on the microprofile characteristics of casting surfaces

“…The edge of the casting, its gates and sprues were cut off with a saw when the cutting fluid was supplied to the cutting zone. The temperature regime for cooling the casting was 690-710 °C [1,10].…”

“…End mills for rough (Table 2) and semi-finishing (Table 3) milling by Sandvick (Sandviken, Sweden) ∅6 mm, ∅8 mm, ∅10 mm, ∅12 mm were used for experimental studies. The experimental sample was processed on a HAAS MINIMILL vertical milling center with numerical control (CNC) (USA) [10]. ISSN 2664-9969…”

“…For real production, cutters for rough milling are used for preliminary (rough) processing of a workpiece, cutters for semi-finishing milling are used for intermediate processing between rough and finish milling. The cutting parameters were selected in accordance with the recommendations of the tool manufacturer [10]. Cutting parameters consisted of cutting width (B), cutting depth (t), feed per tooth (Sz), rotation speed (n), cutting speed (V).…”

“…The research carried out is based on the application of the approaches described in the works [10][11][12]. The main hypothesis of the study is the need for a systematic approach to study the effect of cutting modes of a certain method of machining on the provision of surface quality parameters in the technological system (MDTW) [12,13].…”

Determination of the Rational Allowance for Blank Surface Treatment by the Criterion of Technological Damage

“…де m п , m пт -значення коефіцієнтів гомогенності Вейбулла (m), виміряні відповідно для початкового і поточного стану матеріалу виробу. При виготовленні виробу за відомим розподілом коефіцієнта гомогенності Вейбулла (m) доцільно оцінювати деградацію структури матеріалу за його технологічною пошкоджуваністю D [2,22,23]:…”