Livarski vestnik 57 / 2010 nr. 3
Jan Szajnar, Mirosław Cholewa, Marcin Stawarz, Tomasz Wróbel, Wojciech Sebzda
INOCULATION OF GREY CAST IRON WITH USE OF ELECTROMAGNETIC FIELD
Maja Vončina, Jožef Medved, Primož Mrvar, Vitoslav Bratuš, Miro Zdovc, Ivan Kosmač
THE INFLUENCE OF ADDITION OF RECYCLE MATERIAL ON ALLOY QUALITY
Miran Dolinšek, Slavko Dolinšek, Anton Papež
LASER-SINTERED TOOLS FOR DIE CASTING OF NON-FERROUS METALS
Jan Szajnar, Mirosław Cholewa, Marcin Stawarz, Tomasz Wróbel, Wojciech Sebzda
Inoculation of Grey Cast Iron With Use of Electromagnetic Field
Abstract
One way to improve the unification of the casting structure may be the application of forced convection of liquid metal during the crystallization in the mould or continuous casting mould. This paper presents the results describing the influence of selected parameters of rotating electromagnetic field enforcing the movement of liquid metal in the mould on the morphology of graphite in grey cast iron. Different form of flake graphite was obtained in conditions of changes in the rate of liquid metal solidification in the range of pouring and liquidus temperature TP ÷TL and casting with the influence of electromagnetic field.
Maja Vončina, Jožef Medved, Primož Mrvar, Vitoslav Bratuš, Miro Zdovc, Ivan Kosmač
The Influence of Addition of Recycle Material on Alloy Quality
Abstract
In the foundry of light alloys Hidria Rotomatika the material composed from primary blocks and recycling material is used to achieve the alloy of suitable quality. The recycling material originates from the process of die casting, mechanical treatment and from the gating system. As a recycling material also rejection castings are used.
The analysis of the influence of the addition of recycling material on the mechanical properties and quality of final castings was carried out.
The measurements were planned to monitor the quality of the material from the incoming row material through whole process to final product. Beside this several series were made using various portions of recycling material. For the comparison the alloy from the industry was used. For all series the chemical analysis simultaneously with the simple thermal analysis was done. The casting from each series was mechanically treated and the tightness as a standard part of the process was tested. Simultaneously the specimens for the tensile strength, simultaneous thermal analysis and the microstructure analysis were taken from the castings.
Key words: recycling material, recycling, quality of final castings.
The analysis of the influence of the addition of recycling material on the mechanical properties and quality of final castings was carried out.
The measurements were planned to monitor the quality of the material from the incoming row material through whole process to final product. Beside this several series were made using various portions of recycling material. For the comparison the alloy from the industry was used. For all series the chemical analysis simultaneously with the simple thermal analysis was done. The casting from each series was mechanically treated and the tightness as a standard part of the process was tested. Simultaneously the specimens for the tensile strength, simultaneous thermal analysis and the microstructure analysis were taken from the castings.
Key words: recycling material, recycling, quality of final castings.
Miran Dolinšek, Slavko Dolinšek, Anton Papež
Laser-Sintered Tools for Die Casting of Non-Ferrous Metals
Abstract
Rapid and cheap solutions are needed in the manufacturing process of tools for die casting aluminium and its alloys, and other non-ferrous metals. Only thus costs of investments into making tools are returned. In many applications, tools need to have service life only for casting smaller series (up to 1000 castings), while series up to 100 castings are sometimes sufficient for engineering prototypes. Direct metal laser sintering (DMLS) is today one of the most advanced procedures for rapid prototyping (RP) and rapid tooling (RT). Geometric shapes that are hard or even impossibly made with standard methods (e.g. complex internal channels) can be already now sintered for functional testing (e.g. for car or electronics industry and industry of household appliances). Paper presents the possibility to use the DMLS procedure for making inserts to die-casting tools for casting aluminium and to test such tools in industrial conditions.