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Abstract：
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Based on analysis of the geometry relations of the die transition at shaping the right angle step, and according to the principle of volume constant, the basic relations of the shaping curve of right angle step are acquired. The geometry models conforming with reality are established for calculating the volume of spiral cone at different conditions and stages. The piece turning equation is deduced, and the volumes of each spiral cone are calculated. The precise equation of shaping curve of right angle step is acquired. Finally the calculating example is presented.
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AuthorIntro：
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Reference：
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1胡正寰．斜轧与楔横轧．北京：冶金出版社，1985．2张鹏．二辊楔横轧截齐曲线，锻压技术，1981，6（5）．3朱人杰．内直角台肩楔横轧孔型设计．锻压技术，1979，4（1）．4倪泽明．内斜角台阶轧齐曲线浅析．锻压技术，1990，15（1）．
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