Magnesium hot rolling apparatus

Abstract

In a magnesium alloy hot rolling apparatus in which winders that are able to apply heat to and then maintain the temperature of a magnesium alloy sheet while this sheet is in a coiled state are installed on both entry and exit sides of a rolling mill, and in which the magnesium alloy sheet undergoes a sequential thickness reduction via a plurality of reverse rollings, the rolling mill is provided with working rollers and back-up rollers whose surface temperature can be heated to a particular fixed temperature and then maintained at this temperature. According to the present invention, it is possible to prevent any deterioration in the quality of a product which is caused by temperature variations during the hot rolling of the magnesium alloy sheet, and it is possible to improve the yield and increase productivity.

1 . A magnesium alloy hot rolling apparatus in which winders that are able to apply heat to and then maintain the temperature of a magnesium alloy sheet while this sheet is in a coiled state are installed on both entry and exit sides of a rolling mill, and in which the magnesium alloy sheet undergoes a sequential thickness reduction via a plurality of reverse rollings, wherein
 the rolling mill is provided with working rollers and back-up rollers whose surface temperature can be heated to a particular fixed temperature and then maintained at this temperature.   
     
     
         2 . The magnesium alloy hot rolling apparatus according to  claim 1 , wherein the rolling mill is a switchable stage rolling mill in which it is possible for small diameter working rollers which can be heated and then kept at a particular temperature to be installed. 
     
     
         3 . The magnesium alloy hot rolling apparatus according to  claim 1 , wherein a plurality of pairs of pinch rollers which incorporate vertical rollers which can be heated and then kept at a particular temperature are placed between the rolling mill and each one of the pair winders so that stable transporting of the magnesium alloy coil is performed, and wherein tension adjustment apparatuses are provided between the pinch rollers. 
     
     
         4 . The magnesium alloy hot rolling apparatus according to  claim 2 , wherein a plurality of pairs of pinch rollers which incorporate vertical rollers which can be heated and then kept at a particular temperature are placed between the rolling mill and each one of the pair winders so that stable transporting of the magnesium alloy coil is performed, and wherein tension adjustment apparatuses are provided between the pinch rollers.