CAJ | 학술논문

目的：为了提高发动机泵体综合机械性能和降低制造成本，采用精密热模锻技术来实现泵体的精确成形。方法通过确定锻件分模面位置，建立了泵体精密热模锻几何实体模型；在此基础上，建立了泵体热模锻过程三维有限元模型和模拟参数，实现了精密热模锻过程有限元模拟模型。结果通过数值模拟，获得了成形过程中坯料的速度场、等效应变场和温度场及载荷-行程曲线，揭示了泵体热模锻过程中金属充填模具型腔的情况及其变形机理，获得了温度场应变分布以及载荷、打击能量随行程的变化规律，优化了预成形时拍方坯料长度等参数，为确定成形工艺参数提供了科学依据。结论经试验验证，新工艺成形的锻件非加工外形面尺寸精度达到了零件要求，数值模拟结果与实验结果一致。
목적：위료제고발동궤빙체종합궤계성능화강저제조성본，채용정밀열모단기술래실현빙체적정학성형。방법통과학정단건분모면위치，건립료빙체정밀열모단궤하실체모형；재차기출상，건립료빙체열모단과정삼유유한원모형화모의삼수，실현료정밀열모단과정유한원모의모형。결과통과수치모의，획득료성형과정중배료적속도장、등효응변장화온도장급재하-행정곡선，게시료빙체열모단과정중금속충전모구형강적정황급기변형궤리，획득료온도장응변분포이급재하、타격능량수행정적변화규률，우화료예성형시박방배료장도등삼수，위학정성형공예삼수제공료과학의거。결론경시험험증，신공예성형적단건비가공외형면척촌정도체도료령건요구，수치모의결과여실험결과일치。
Objective In order to improve the mechanical properties and to decrease the production cost of engine pump body, precision hot forging process was employed to manufacture the part. Methods Based on the determination of parting face position of the part, the solid geometric model was established for the precision hot-die forging of pump body. A 3D fi-nite-element model and the simulation parameters for the forging process were built, and the finite element simulation mod-el for precision hot-die forging was achieved. Results The distributions of velocity field, equivalent Mises plastic strain field and temperature field, as well as the curves of load and blow energy with displacement were obtained through numeri-cal simulation. The results revealed the metal filling of the mold cavity during the hot-die forging process of the pump body and the deformation mechanism. The strain distribution of temperature field and the variation laws of the load and the blow energy with displacement were obtained. The process parameters during the preforming process such as the length of the square billets were optimized, which provided scientific reference for the determination of forming process parameters. Conclusion The accuracy of the non-working surface of the forgings formed with the new process could meet the require-ments as verified by experiments, and the results of numerical simulation were consistent with those of experiments.