CONCEPTUAL DESIGN OF HELICAL COILING MECHANISM FOR THE INTEGRATION OF ROLLING MILL

T.A. Madankar, J.P. Modak, M.M.Gupta

Abstract: Circular bar of range of diameters is one of the significant products of rolling mill used for civil construction purpose. The reinforcement of construction work consists of longitudinal and transverse members. Transverse member is called as stirrup. According to the need of civil structure various shapes and sizes of stirrups are used for constructing the beams and columns. The stirrups are made manually or using semiautomatic machines at construction site or separate units are set up with automatic computer control machines. It is proposed to make stirrups at the last stand of rolling mill in the form of helical continuous coil instead of existing practices of stirrup making. Stirrups are cut from helical coil at construction site or continuous coil can be employed as a helical reinforcement. Existing engineering standards recommend use of continuous helical coil for the better strength. The work is aimed on conceptualizing a device, can be called as helical coiling mechanism, and integrating it with hot rolling mill. The efforts are made to access different alternative mechanisms which would be capable to work with the outlet conditions of bar of rolling mill. The bar coming out from the rolling mill is fed to the proposed mechanism for forming the helical coil. The suitable alternatives are discussed. The evaluation is done on the basis of merits and demerits for the selection of best suitable mechanism for the purpose. It is concluded that triple dowel mechanism out of six identified mechanisms would be best suited for the conceptual helical coil machine. The stirrup made by proposed technique achieves competitive advantages over existing stirrup making practices like the reduced handling of bar, hot rolled bars are bent into required sizes with less power along with good metallurgical and mechanical properties.

Keywords: Stirrup, helical coil, coiling mechanism, integration, drum, dowel.

DOI: https://doi.org/10.15623/ijret.2015.0412023