THE CONTROL OF EARING IN ALUMINIUM AND ITS ALLOYS
Ths problem of earing in aluminum and its alloys is of considerable importance to fabricators and consumers because of the detrimental effect of ears on the quality of deep-drawn products, and it is desirable that earing should be eliminated or reduced to a very low level in the materials most commonly used for deep drawing. These are super-purity and commercial-purity aluminum and aluminum --manganese, aluminum --magnesium, and aluminum --magnesium --silicon alloys. The earing of aluminum and its alloys is affected by variations in fabricating technique, and it is the purpose of the present paper to describe the conclusions drawn from work at Aluminium Laboratories Limited and the Northern Aluminium Co., Ltd., on the way in which these variations affect earing, so that suitable adjustments may be made to reduce earing to a satisfactory level in any particular plant. The earing of sheet produced in the normal manner (i.e. by homogenizing the ingot hot rolling, cold rolling, and final annealing) has been found to vary according to the finish thickness. The shape or the curve of earing plotted against finish thickness is dependent upon the fabricating conditions, and this curve has been ussd to show the affects of alloy type and composition, preheating, hot rolling, interannealing, and cold rolling. (auth)
- Research Organization:
- High Duty Alloys, Ltd., Slough, Bucks, Eng.; Aluminium Labs., Ltd., banbury, Oxon, Eng.
- NSA Number:
- NSA-12-009202
- OSTI ID:
- 4317686
- Journal Information:
- J. Inst. Metals, Journal Name: J. Inst. Metals Vol. Vol: 86
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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