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Abstract：
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Based on the free bulging experiment of LF21(M) Aluminium alloy and 20 low carbonsteel sheet, it is found that the internal surface of the bulged LF21(M) Aluminium alloy workpiece ac-cords with the theoretic paraboloid, within the range of 0.30 to 0.45, the practical ratio of theparaboloid focal distance to its open diameter, which the antenna reflectors usually takes. This findingshows the possibility of forming the antenna reflectors using the free bulging method and it provids anew way to reduce the cost of the formig die.
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