CAJ | 학술논문

大型曲轴是大型内燃机的关键零件.针对我国大型船用曲轴锻造中存在的精度低、加工余量大等问题,采用DEFORM-3D软件对其TR镦锻过程进行了数值模拟仿真.通过模拟分析曲轴成形的塑性流动规律,找出了大型船用曲轴曲拐成形过程中的典型缺陷连杆颈和曲柄臂外侧折叠的成因.研究发现,弯曲下模和预锻模设计不合理是造成曲轴锻件折叠缺陷的主要原因;并在此基础上优化了锻件成形的工艺方案,从而为大型曲轴镦锻模具设计提供了科学依据.生产试验表明,采用新的模具结构设计方案,可以有效避免大型曲轴镦锻时的折叠缺陷,所成形的曲轴质量良好.
대형곡축시대형내연궤적관건령건.침대아국대형선용곡축단조중존재적정도저、가공여량대등문제,채용DEFORM-3D연건대기TR대단과정진행료수치모의방진.통과모의분석곡축성형적소성류동규률,조출료대형선용곡축곡괴성형과정중적전형결함련간경화곡병비외측절첩적성인.연구발현,만곡하모화예단모설계불합리시조성곡축단건절첩결함적주요원인;병재차기출상우화료단건성형적공예방안,종이위대형곡축대단모구설계제공료과학의거.생산시험표명,채용신적모구결구설계방안,가이유효피면대형곡축대단시적절첩결함,소성형적곡축질량량호.
The heavy crankshaft is the key component of large diesel engine.Aiming at the low precision and big machining allowance in the heavy crankshaft's forming,the heavy crankshaft's forging.process was simulated by DEFORM-3D software.Based on the analysis of plastic flow law in crankshaft forming,the cause of typical forming defects,i.e.the folding existing in the crankshaft pin and crank arm was found out.It is shown that the improper design of bending lower die and pre-forging die is the main cause of crankshaft's folding;so the forming process for the heavy crankshaft is optimized accordingly,which is the scientific basis of die design.Experimental results show that tlle forming defects existing in the heavy marine crankshafts could be eliminated and the high-quality crankshaft could be forged by the utilization of optimal die structure parameters.