Features of Steel Mouldings Production in Graphitic Shell Molds

Abstract

Exothermic reaction in thermite charge of casting pattern was investigated by estimated and experimental techniques. Thermophysical properties of steel mouldings production in graphitic shell molds were determined.

Efficiency of Steel Casting Production by Aluminothermic Metal Reduction

“…The use of such moulds in practice makes it possible to cut the consumption of liquid steel for molding production and to utilize waste more rationally. Thus to achieve this the method of steel molding is used [8][9][10][11] in which a model block with a gating system is fabricated from ironaluminum thermite, ferroalloys and wax-like pattern materials. The model is coated with some layers of suspension consisting of thermosetting mortar and a refractory material -graphite.…”

“…A one-dimension finite-difference computational algorithm of melt formation in the aluminothermic reaction was developed. The influence of thermite charge component concentrations on the chemical composition of the produced melt was determined [8].…”

“…At present thermite melting is usually industrially applied for thermite welding of rail joints as well as for heating shear drags of massive moldings. Spatial mobility of the process and the simplicity of its realization are the obvious advantages of thermite melting [7,8]. However the use of this process for mass recycling of industrial waste is not always efficient because of a rather low yield of the molten metal (about 40 % of the charge mass) and a high portion of a reducer in the thermite charge (up to 25 %).…”

Influence of Onset Temperatures of Thermite Charge and Casting Molds on Structure and Physical-Mechanical Properties of Casting Blanks, Obtained by Aluminothermic Reduction

“…Переработка окалины, представляющей собой смесь окислов железа, может быть сведена к извлечению последнего из этой смеси в результате проведения алюмотермического окислитель-но-восстановительного процесса [1]. Известны варианты совмещения этого процесса с получением готового продукта: экзотермический обогрев прибыли отливок и их питание [2][3][4][5]; алюмотермическая свар-ка стальных элементов металлоконструкций [6,7] и резка металлов [8], а также для получения всего тела отливки [9,10].…”

Numerical Modeling of Thermal Stress State of "Shell Mold-Casting" System with Phase Change when Inverstment Casting

“…were suggested. One of the most prospective methods is a technology of artificial porosity creation in one or several internal SM layers [6]. Porous layer created using the above-mentioned technology will act as a damper under the temperature impact.…”