Aluminium Cast House Technology VIII by Peter R. Whiteley

By Peter R. Whiteley

From the eighth Australasian convention on Aluminium Casthouse expertise in Brisbane, Australia, September 14-17, 2003

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This oil was a hydraulic oil (HLP-32 of M/s IOC) which had a mineral oil base with some additives. The additives in mineral oil lead to choking of graphite rings. It was therefore decided to use a vegetable oil (double filtered rapeseed oil). This oil gave a better finish of billets due to better lubricating properties but at the same time graphite ring choking problem aggravated. 25 Hindalco associated themselves with M/s Indian Oil Corporation's R&D section, for developing in their laboratory, a casting oil which can give a better graphite ring life as well as surface finish of billets.

Oil and Grease f 15 CD JlO 2 5 © 15 9 n 2000 2001 1 3 | 2002 Year Casting temperature control in slab casting Initially about 20-22 casting/month were above the high temperature limit of 720 deg. C. Major constraints were 20 metre long launder, difference in spout temperature and bottom temperature of furnace, and pick up of heat from furnace walls during casting. A study was initiated to monitor the spout temperature, bottom temperature, casting temperature at the start and maximum casting temperature in each cast.

4 per litre. The graphite ring life with this casting oil was about 200 castings. This oil was a hydraulic oil (HLP-32 of M/s IOC) which had a mineral oil base with some additives. The additives in mineral oil lead to choking of graphite rings. It was therefore decided to use a vegetable oil (double filtered rapeseed oil). This oil gave a better finish of billets due to better lubricating properties but at the same time graphite ring choking problem aggravated. 25 Hindalco associated themselves with M/s Indian Oil Corporation's R&D section, for developing in their laboratory, a casting oil which can give a better graphite ring life as well as surface finish of billets.

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