CAJ | 학술논문

基于 PRASAD 提出的传统的二维加工图理论，建立考虑应变的三维加工图，描述功率耗散系数和流变失稳区域随应变速率、温度和应变的变化。三维加工图说明了材料的内禀可加工性，而有限元分析方法可得到材料在特定工艺条件下应力、应变、应变速率及金属流动情况，说明了由模具形状和工艺条件决定的应力状态可加工性。基于此，提出一个新的由材料驱动的热变形可加工分析方法，联合考虑有限元和三维加工图，可以说明整个热加工过程的材料可加工性(包括应力状态可加工性和内禀的可加工性)。通过此方法，研究难变形金属镁合金的热锻过程，包括复杂热锻直齿锥齿轮的三维热力耦合有限元和三维加工图的集成模式。基于得到的研究结果，成功进行了热锻试验。试验表明新的方法用于确定最佳工艺参数是合理的。
기우 PRASAD 제출적전통적이유가공도이론，건립고필응변적삼유가공도，묘술공솔모산계수화류변실은구역수응변속솔、온도화응변적변화。삼유가공도설명료재료적내품가가공성，이유한원분석방법가득도재료재특정공예조건하응력、응변、응변속솔급금속류동정황，설명료유모구형상화공예조건결정적응력상태가가공성。기우차，제출일개신적유재료구동적열변형가가공분석방법，연합고필유한원화삼유가공도，가이설명정개열가공과정적재료가가공성(포괄응력상태가가공성화내품적가가공성)。통과차방법，연구난변형금속미합금적열단과정，포괄복잡열단직치추치륜적삼유열력우합유한원화삼유가공도적집성모식。기우득도적연구결과，성공진행료열단시험。시험표명신적방법용우학정최가공예삼수시합리적。
The three-dimensional (3D) processing maps considering strain based on the two-dimensional (2D) processing maps proposed by PRASAD can describe the distribution of the efficiency of power dissipation and flow instability regions at various temperatures, strain rates and strains, which exhibit intrinsic workability related to material itself. Finite element (FE) simulation can obtain the distribution of strain, strain rate, temperature and die filling status, which indicates state-of-stress (SOS) workability decided by die shape and different processing conditions. On the basis of this, a new material driven analysis method for hot deformation was put forward by the combination of FE simulation with 3D processing maps, which can demonstrate material workability of the entire hot deformation process including SOS workability and intrinsic workability. The hot forging process for hard-to-work metal magnesium alloy was studied, and the 3D thermomechanical FE simulation including 3D processing maps of complex hot forging spur bevel gear was first conducted. The hot forging experiments were carried out. The results show that the new method is reasonable and suitable to determine the appropriate process parameters.