CAJ | 학술논문

针对提出的铸辗连续成形新型工艺，从细化组织、提高铸件质量，避免裂纹缺陷方面考虑，分别对采用砂型和金属型的42CrMo铸造环件进行温度场、应力场的数值模拟，利用模拟结果，进行凝固冷却过程裂纹倾向性预测。得到铸坯冷却速度越大，在铸型内停留时间越长，铸件收缩量越大，热应力越大，形成裂纹的倾向性也越大。边角部是最容易形成裂纹的部位。同时通过对铸坯进行微观组织数值模拟，建立冷却速度与二次枝晶臂间距的函数关系，分析冷却速度对组织性能的影响，得到采用金属型铸造可获得比砂型铸造组织性能好的铸坯。通过对比两种铸造方式，确定采用金属型铸造在1050℃左右温度下出模，可获得高质量无缺陷铸坯，可基本满足基于42CrMo环坯的铸辗连续成形工艺要求。分析结果可为预测铸件质量，试验研究提供理论参考。
침대제출적주전련속성형신형공예，종세화조직、제고주건질량，피면렬문결함방면고필，분별대채용사형화금속형적42CrMo주조배건진행온도장、응력장적수치모의，이용모의결과，진행응고냉각과정렬문경향성예측。득도주배냉각속도월대，재주형내정류시간월장，주건수축량월대，열응력월대，형성렬문적경향성야월대。변각부시최용역형성렬문적부위。동시통과대주배진행미관조직수치모의，건립냉각속도여이차지정비간거적함수관계，분석냉각속도대조직성능적영향，득도채용금속형주조가획득비사형주조조직성능호적주배。통과대비량충주조방식，학정채용금속형주조재1050℃좌우온도하출모，가획득고질량무결함주배，가기본만족기우42CrMo배배적주전련속성형공예요구。분석결과가위예측주건질량，시험연구제공이론삼고。
Based on the proposed a new technology casting-rolling continuously forming of ring parts, it is considered to detail organization, improve the quality of castings, and avoid the crack defects. Numerical simulations of temperature field and stress field are taken respectively in 42CrMo of sand mold and metal mold casting, solidification cooling process and the crack tendency prediction is studied by using the simulation results. The greater cooling rate in the cast was, the longer the casting stayed in the mold and the bigger the casting shrinkage is, the greater thermal stress will became, the greater the inclination of forming crack isare. The part of the edge is the easier to form cracking. By the numerical simulation of the microstructure for the casting, the functions of the cooling velocity and the secondary dendrite arm spacing are established. The effect of cooling rate on the organization performance is analyzed. It is obtained that the casting performance is the better using the metal mold casting than using the sand mold casting. Comparing the two casting methods, it is identified that the higher quality and no defects casting may be got when casting temperature out of the mold about 1 050 ℃. It can be satisfied in technology requirement based on casting-rolling continuously forming of ring parts. Analysis results may provide a theoretical reference for forecast the quality of castings and experiments.