Re-design for rectifiers
November 1st 2006 Riley Industries is a re-seller of used and refurbished surface finishing plant and equipment. It has recently secured a large order for the re-design, refurbishment and supply of DC rectifiers from a USA supplier of Titanium castings to the aerospace industry. The application for which the rectifiers have been re-designed is the anodic melting of Titanium prior to it being poured into a mould, a process known as 'skull casting'. An electrode is hooked to the positive side of the power supply and inserted into a copper crucible, which is hooked to the negative side. Direct current produces an arc that initiates the melting process, which takes 12 to 15min. There are four Westinghouse aircooled, silicon diode transformer rectifiers, each with a 6000A/36V capacity. They have been fitted with a new Thyristor control system, enabling them to work as one master and three slave units in parallel, delivering 0-24 000A/0-36V of continuous power. More articles from Riley Industries Ltd: | 
