A Centering Technique for Cast-Iron Moulds in Horizontal Centrifugal Casting
Leopold Hrabovský 1  
,   Ivan Mašlonka 2  
,   Tomáš Kubín 3  
,   Martin Mantič 4  
 
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1
VSB - Technical University of Ostrava Faculty of Mechanical Engineering Institute of Transport Department of Transport and Process Equipments 17. listopadu 2172/15 708 00 Ostrava - Poruba Czech Republic
2
KonCAD CZ s.r.o. Hlubinská 917/20 702 00 Moravská Ostrava Czech Republic
3
VSB - Technical University of Ostrava Faculty of Mechanical Engineering Department of Production Machines and Design 17. listopadu 2172/15 708 00 Ostrava - Poruba Czech Republic
4
Technical University of Košice Faculty of Mechanical Engineering Institute of design machine and process engineering Department of Construction and Transport Engineering Letná 9 Street 042 00 Košice Slovak Republic
CORRESPONDING AUTHOR
Leopold Hrabovský   

VSB - Technical University of Ostrava Faculty of Mechanical Engineering Institute of Transport Department of Transport and Process Equipments 17. listopadu 2172/15 708 00 Ostrava - Poruba Czech Republic
 
 
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ABSTRACT
In this contribution, a technique of axial centering of cast-iron moulds, e.g. the so-called “rail system” as suggested by KonCAD CZ s.r.o. for the application of horizontal centrifugal metal casting process, is described, evaluated, and finally not recommended for practical use. The proposed principle of the axial centering technique is based on the fact that on the cast-iron mould external perimeter there are welded, perpendicularly to the cast-iron longitudi-nal centreline, two rings the external shape of which is similar to the shape of the Vignole (flat-bottomed) rail. The cast-iron moulds are supported by two pairs of opposite conic roll-ers. The cast-iron mould is driven by a contact power transmission, i.e. by the friction meth-od employing a pair of conic rollers and acting over the welded rings to the cast-iron mould. The circumferential force transfer is carried out by the friction between the cast-iron mould rings and the two driving rollers. Both driving and driven rollers have similar shapes analo-gous to a tyred wheel profile. The two driving rollers are tightly fit on the common drive shaft, the centreline of which runs in parallel with the cast-iron mould longitudinal centre-line. Both driving and driven rollers have a similar shape as a tyred wheel profile. The neces-sity of creating of a sufficient thrust force of the cast-iron mould against the rollers causes wear conditions at the rounding of external shapes of rings, bearings, as well as roller con-tact conic surfaces.