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5 Archives of Foundry Engineering

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Filter effectiveness in the manufacture of high-chromium steel castings

100%

Drotlew A. , Garbiak M. , Kubicki J. , Piekarski B. , Stańczyk J.

Archives of Foundry Engineering

2011

tom Vol. 11, iss. 1

15-20

The paper presents the results of studies on the application of ceramic filters in the manufacture of cast hearth plates at the West Pomeranian University of Technology in Szczecin. Castings were poured from the heat-resistant G-X40CrNiSi27-4 cast steel in green sand moulds. The development of casting manufacturing technology included the following studies: analysis of the causes of non-metallic inclusions in high-chromium alloys, computer simulation of mould filling with liquid metal using standard gating systems without filters and new systems with the built-in filter, making pilot castings, quantitative determination of the content of non-metallic inclusions, determination of the oxygen and nitrogen content, and evaluation of the extent of occurrence of the raw casting surface defects. As a result of the conducted studies and analyses, the quality of produced castings was improved, mainly through the reduced content of non-metallic inclusions and better raw casting surface quality.

New generation of pattern materials for investment casting

80%

Karwiński A. , Młodnicki S. , Pabiś R. , Robak I. , Kubosz G.

Archives of Foundry Engineering

2011

tom Vol. 11, iss. 1

53-56

Pattern mixtures (so-called soft mixtures) currently used in investment casting are composed of paraffin, stearin, and - to a lesser extent - of ceresin, polyethylene wax and other natural and synthetic waxes. During studies, several types of soft pattern mixtures were developed by modifying the already existing compositions with appropriate additives. Based on the studies of physico-chemical and performance properties, the composition of pattern material was optimised.

Technological and ecological studies of moulding sands with new inorganic binders for casting of non-ferrous metal alloys

80%

Izdebska-Szanda I. , Szanda M. , Matuszewski S.

Archives of Foundry Engineering

2011

tom Vol. 11, iss. 1

43-48

The article presents the results of studies which form a part of broader research programme executed under the project POIG.01.01.02-00-015/09 "Advanced materials and technologies". In a concise manner, the results of studies on the effect of chemical modification of inorganic binders on the technological properties of moulding sands containing these binders were presented. Special attention was paid to the effect of modification of inorganic binders on their thermal destruction behaviour in the range of pouring temperatures of the non-ferrous metals and their alloys. Also the results of comparative studies of the thermal emission of toxic gases and odours from moulding sands with new inorganic and organic binders were discussed.

Effect of Inhibitor Coating of a Ceramic Mould on the Surface Quality of an AM60 Alloy Cast with Cr and V

80%

Pisarek B. P. , Rapiejko C. , Święcik R. , Pacyniak T.

Archives of Foundry Engineering

2015

tom Vol. 15, iss. 3

51--56

The work presents the results of the investigations of the effect of inhibitors coated on the internal walls of a ceramic mould on the quality of the obtained casts made of the AM60 alloy containing additions of chromium and vanadium. In order to reduce the reactivity of magnesium alloy cast by the technology of investment casting with the material of the mould and the ambient atmosphere, solid inhibitors were applied in the form of a mixture of KBF4 and H3BO3 after the stage of mould baking and before the mould’s being filled with the liquid alloy. For the purpose of examining the effect of the inhibitors on the surface quality of the obtained casts, profilometric tests were performed and the basic parameters describing the surface roughness, Ra, Rz and Rm, were determined.

Heat balance analysis of EPS products shaping process

80%

Władysiak R. , Bogus W. , Pacyniak T.

tom Vol. 13, iss. 3

107--112

The work is a part of research into the reduction of energy consumption in the production of EPS through the modernization of technological equipment used. This paper presents the results of research and analysis of heat transfer process between the water vapor that was provided to machine, the mold, the product and the environment. The paper shows the calculation of the heat balance of the production cycle for two types of mold: standard and modernized. The performance tests used an infrared imaging camera. The results were used to develop a computer image analysis and statistical analysis. This paper presents the main stages of the production process and the construction of technological equipment used, changing the mold surface temperature field during the production cycle and the structure of the heat balance for the mold and its instrumentation. It has been shown that the modernization of construction of technological equipment has reduced the temperature field and as a consequence of decreased of demand for process steam production cycle.