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bai dong zhan ya li neng can shu ji suan
Pages: 62-80
Year: Issue:  2
Journal: Materials Science and Technology

Keyword:  摆动辗压机曲率半径接触面积率计算公式摆辗力变形速度工件表面工件半径塑性状态应力状态系数;
Abstract: This paper deals wish the methods for calculating the force and energy in rotating forging processes.Two accurate formulae have been derived for calculating the contact area rate in Cartesian system and the polar system,i.e. λ=1/π[4/3Q~2(1/Q-1)~(3/2)+cos~(-1)(1-2θ)-θ(1-θ)(1/Q-1)~(1/2) λ-1/(2π)[α+(1+2Q)1/3sinα in which Q=(s/(2Rtgr))~(1/2),α=cos~(-1)(1-2Q) and the abbreviated formula may be giveu as λ=0.4Q~(1/2)+0.14Q Formulae for calculating the force on workpieces with varions relative thickness have been suggested as follows: for thin workpieces when plastic hinger exists P_T=n_Vn_HπR~2λ[1+0.414e~(-3.5Q)+(mR)/h(0.24Q+0.141)]×2K and for thick workpieces P_T=n_Vn_HπR~2λ[1+0.414e~(-3.5Q)+m(0.24Q+0.141)]×2K Comparison of rotating and common forgins was made and why rotating for- ging saves force was theoretically discussed.
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