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Science Science | Technical Drain frame and honeycomb metal structures on gazifitsiruemym models
Science Science | Technical Drain frame and honeycomb metal structures on gazifitsiruemym models
| Drain frame and honeycomb metal structures on gazifitsiruemym models |
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| Written by Влад Дорошенко | |
| Tuesday, 03 February 2009 | |
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The text of the original in Russian Copying the structure of the Universe: TECHNOLOGIES OF THE FUTURE WORK TODAY Drain frame and honeycomb metal structures on gazifitsiruemym models Frame and honeycomb metal structures and materials, you can pour on gazifitsiruemym models performing on their counterparts from the animate and inanimate nature. These articles refer to the future of materials, they will expand the existing range of properties of metal, as 50-90% more compact materials have potential applications in construction, coupled with the volume or flow of matter or energy, as well as the backbone for the reinforced and composite materials. .jpg) Fig. 1a. Polyurethane foam with a foam cutting pores (enlarged), cell size up to 2,5 mm  Fig. 1b. Samples molded foam made of stainless steel 316L with the size of the cells 20, 45 and 60 ppi  Fig. 1c. Tubular heat exchangers with steel foam (steel 316L, the cell width of 20 ppi). Modern engineering relies on a significant reduction in metal consumption and the cost of production through the use of high metallozagotovok and new materials, including the cast. In this regard, there is a dynamic distribution in the world practice the method of casting on gazifitsiruemym models (LGM-process) that satisfies these requirements and offers a number of prospects for castings of ferrous and nonferrous metals, production of which reaches 1.5 million tons / year. LGM can be attributed to the high foundry technologies that break the stereotypes that the high-tech - it's always challenging inaccessible production. Furthermore, LGM improves the culture of production, excluding the use of tie and giving the form of gases, with its vacuum. The Institute FTIMS National Academy of Sciences of Ukraine, based on the study of heat and mass, gazogidrodinamicheskih processes and the crystallization of metal in the interaction with the products of degradation models and sandy vakuumiruemoy form continued to improve technology LGM, as well as a set of basic technological equipment for the foundry shop capacity 100 - 5000 tons / year. The Institute designed and launched a series of workshops in Russia, and has introduced such equipment in Poland and Vietnam, the latest facilities - room for 400 tons / month / year in Dnepropetrovsk. The production capacity of technology LGM on the creation of new materials and structures is far from exhausted, and very significant, because it allows you to determine not only the metals and alloys, but also get reinforced composites, and design with high, compared with conventional alloys, the properties several times, for example, tribotechnical. Technology created an overlay of high pressure on the liquid metal (as a way of combining LGM with casting under pressure) or gas dilution in the foundry shape with foam model, which Prefill densely packed insert as the reinforcement, the reinforcing phase called specialists, increase the depth of impregnation of the (non - or metallic) phase matrix alloy compared with gravitational casting in 8 - 10 times in the reinforced parts longer than 1 m. Moreover, in recent years, LGM offers a range of its capabilities (and this is the main theme of this article), which empowers foundry. Among such examples can be carried out in Germany for the manufacture of the steel foam casting of burned models in the forms of communication, as also indicated in the annual report of the institute (Fraunhofer Institute for Manufacturing Technology and Applied Materials Research (IFAM), Dresden), 2005 site www.ifam-dd.fraunhofer.de.). This site shows photographs of foam foam with open pores up to 2.5 mm (Fig. 1 a), which serves as the model for burned casting steel foam, as well as samples of the foam cast in stainless steel 316L with the size of the cells 20, 45 and 60 ppi (Fig. 1 b). and tube heat exchangers with steel foam (steel 316L) with a cell size of 20 ppi (Fig. 1). In this work indicates that the honeycomb material are expanding the existing range of properties, as they are ~ 50-90% more compact material, while steel has a minimum porosity foam ~ 80% and a high level of porosity for the structural strength and rigidity. However, industrial use of polyurethane foam as a model with a pore size of not more than 2.5 mm, in our view, limits the size of the output of metal foam as a cellular material, in addition, it is difficult to stably obtain the same functional properties. Assessing the technological capabilities of manufacturing such foams and honeycomb structures in the domestic environment, have developed a number of new constructions of models for LGM, because the process of obtaining energy has long operation (burn model calcination forms) such as casting on smelt models. Getting a polyurethane foam with a stable size of cells, thickness of walls is difficult, as well as to shed the thin walls of foam without a sintering of metal with formirovochnoy a mixture of respect, that can disrupt the homogeneity of the structure of metal foam. In FTIMS previously received samples of the copper foam by causing copper to polystyrene pellets followed by burning, but the production of metallic foams and cellular materials casting is preferable from the standpoint of industrial application. Such materials have potential for use as load-bearing, reinforcement, insulation, fencing, construction impacts damping that can interact with the volume or flow of matter or energy. They are applicable for the treatment of gases, liquids, noise mufflers, systems, pressure sensors, explosion and plamyapregraditeley, adsorption, acoustic, heating, heat exchange devices, elements of current sources, catalysts, electrodes, systems designs and facilitate as the backbone for composite materials. Unlike these technologies, in FTIMS now been created and patented versions of cast metal with an open porosity of vakuumiruemye form of dry sand without binder to foam models. Models are made in the form of spatial grids, in particular, like the image of crystal lattices in crystallography (Fig. 2). At the same time among the nodes of the cells filled jumper casting models (partitions), and the sites serve connections or crossing bridges. For the crystal lattices of the canons of Crystallography typical three-dimensional periodicity. Determine the structure of one cell, one can construct the whole lattice, for example, using a simple geometric operation of parallel transport. Two-dimensional model of the «grid» such gratings with a near vertical jumpers conveniently carried out in molds with a flat connector. In doing so, we obtain the elements of design, of which, by pasting in the pile (the repetition in the lattice) are gaining space grid structure. Implementation of the model on the method of cross-guarantees or cavities of the same day, the minimum size of which only a limited opportunity to fill them with dry sand at the sites LGM. The size of pores, holes obtained cast material can be up to tens of millimeters or more, while the size of crystal lattices of cells, used as prefigurations for foam models, the order of tenths of nanometers. To cast the honeycomb material, compiled from the plane lattices obtained in the mold, it is advisable to apply all the requirements of foundry technology, for example, to execute a model casting radii, which would gradually fill the form of the metal and increase the rigidity of the structure, and the best occupancy melt is achieved by jumper cylindrical shape, which minimized the area of heat transfer. If the cells you can, then you can enter in the space between the porous impermeable barrier to Sand pipelines. Connecting these pipes to a vacuum pump-term improves the filling of forms of metal, stimulating effect of vacuum suction melt, which will prevent nedolivy form and will significantly increase the size of cast construction, even thin. Full paper with formulas and calculations in pdf format is available to registered users in the gallery profile. profile page, tab 'gallery profile. to read the full name of the file in the gallery mouse over the folder icon labeled PDF |