CAJ | 학술논문

通过热压缩试验研究钼金属在应变速率为0.01～10 s~(-1),变形温度为900～1450 ℃条件下的热变形性能,建立了基于流变应力的钼金属热变形的本构方程.应用有限元分析软件DEFORM中的COGGING模块对钼金属棒材的径向精锻过程进行模拟,确定合理的工艺参数,并对模拟结果进行分析.结果表明:本研究提出的用于模拟结果分析的锻透性判据合理,工艺过程和参数的确定方法正确.研究表明:影响锻透性的主要因素为道次压入量和锤头倾角;影响锻件表面质量的主要因素为轴向送进速度和旋转角度.
통과열압축시험연구목금속재응변속솔위0.01～10 s~(-1),변형온도위900～1450 ℃조건하적열변형성능,건립료기우류변응력적목금속열변형적본구방정.응용유한원분석연건DEFORM중적COGGING모괴대목금속봉재적경향정단과정진행모의,학정합리적공예삼수,병대모의결과진행분석.결과표명:본연구제출적용우모의결과분석적단투성판거합리,공예과정화삼수적학정방법정학.연구표명:영향단투성적주요인소위도차압입량화추두경각;영향단건표면질량적주요인소위축향송진속도화선전각도.
Hot workability of metal molybdenum was investigated by means of hot compression tests carried out in the temperature range of 900～1450 ℃ and strain rate range of 0.01～10 s~(-1). A constitutive equation of molybdenum for the flow stress was presented. The radial precision forging process of the molybdenum bar was simulated by COGGING modular of FEM software DEFORM. Reasonable process parameters were determined, and the forging penetration efficiency was explored from the strain-effective state. The results show that the forging penetration efficiency criterion put forward for the simulation result analysis is reasonable. Determination methods of the process and parameters are correct. Research shows that the main factors influencing forging penetration efficiency are reduction in pass and the dip angle of the hammer, and the main factors influencing forged piece surface quality are axle feeding speed and rotation angle.