PDF Print E-mail

Continuous Casting

 

Since the 1960s, the Mittelrheinische Metallgiesserei metal foundry has been producing semi-finished products made of cast copper alloys in specially developed vertical continuous casting plants. The MMHB has been able to establish itself internationally thanks to a continued drive to refine and further develop the technology and progressively increase the size of products that can be processed.

At the Mittelrheinische Metallgiesserei metal foundry, the continuous casting plant consist of a channel induction furnace which is used to hold the temperature of the molten metal, a tool mounting with copper cooling piece and graphite mould which is mounted on the floor of the furnace, the stripper rollers underneath and the cutting device immediately afterwards.

The molten metal passes via crane operated ladles from the electrically heated smelting furnace into the holding furnace of the continuous casting plant. On the floor of the holding furnace there is a ceramic floor piece which is inserted in a precise fit into the graphite mould. The graphite mould is located inside a water-cooled copper cooling piece, and it defines the subsequent form of the cast semi-finished products by virtue of its internal contours (eg. round, rectangular, hexagonal or other customer-specific form requests). Hollow profiles can also be cast by inserting a graphite mandrel.

For the casting-on process, the entire continuous casting plant is tipped away to the rear so that the liquid metal flows away from the floor opening. A dummy bar which is held by the stripper rollers is inserted from below into the mould. After the continuous casting plant has been tipped back up into the vertical position, the molten mass flows into the mould where it combines with the dummy bar. The stripper rollers move the dummy bar and thus the billet which is being generated in the mould downwards in a "go and stop" movement. The stripping speed is carefully selected to allow the molten mass to solidify in the graphite mould. After a previously defined length of billet has been extracted, the billet is cut off to the desired length by a cutting device, a so-called "flying saw", underneath the stripper rollers.  

Thanks to a policy of continuous improvements, the Mittelrheinische Metallgiesseren MMHB is today capable of drawing flat and rectangular rods of up to 512 mm. This can be cut to length to suit all customer requirements.

 Available in stock  rods, tubes, rings, flat bars, rectangular- nad hexagonal bars, profiles
   gun metal, bronzes, leaded bronze, aluminium bronze, in various sizes and on request