共查询到18条相似文献,搜索用时 125 毫秒
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大型弯曲面导叶电渣熔铸工艺模拟及应用 总被引:2,自引:0,他引:2
论证了电渣熔铸过程数学模型,形成电渣熔铸导叶工艺过程三维数值模拟软件包ES-RC3D。用此软件包模拟了电渣熔铸全过程。优化了电渣熔铸工艺并应用于大型变曲面水轮机导叶的生产,取得良好技术,经济效益,并使电渣熔铸生产工艺从经验走向科学。 相似文献
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电渣熔铸过程中熔渣的流动决定了熔铸体系温度场的分布以及金属熔池的形状,最终影响熔铸钢锭的质量。采用大型通用有限元分析软件ANSYS,对电渣熔铸体系渣池流场进行了模拟研究,所得结果与物理模拟实验结果完全一致。并以此研究了熔铸电流,填充比和电极端部形状对熔渣流速分布的影响,为实际生产提供了依据。 相似文献
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An-guo Wang Zhou-hua Jiang Yan-chun Lou Ji Tang Yun-long Xiong Yan-wu Dong Yan-wu Dong Fu-bin Liu Jing-chang Cheng Rui Chen 《中国铸造》2020,(1):48-55
Electroslag casting(ESC)is an important method to produce high quality castings.In this study,the ESC up-pulling inner mold method(EUPIM)was used to produce hollow cylindrical castings with the multiple consumable electrodes.The radial deformation,the axial and radial internal stress of the inner mold,and the axial internal stress of the slag shell were analyzed using the finite element method(FEM)with the aid of ANSYS software.The ProCAST software was used to calculate the specific heat,heat conductivity and density curve of Cu.Simulation results show that the radial deformation,the axial and radial internal stress of the inner mold,and the axial internal stress of the slag shell near the slag-metal interface of hollow cylndrical casting gradually increase from 0 s to 360 s after the ESC starting(slagging)process but before applying the up-pulling force.The suitable initial up-pulling moment of the inner mold is at around 180-198 s after the starting process. 相似文献
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目的 观察大豆异黄酮对YAC-1 细胞及小鼠ESC艾氏肉瘤生长的抑制作用及对免疫功能的影响。方法 用MT T 法测定大豆异黄酮对YAC-1 细胞生长的抑制率和小鼠淋巴细胞转化刺激指数;LDH 释放法测定小鼠NK 细胞活性;称重观察肿瘤生长和脾指数和胸腺指数。结果 金雀异黄素和大豆甙元剂量依赖性抑制YAC-1 细胞生长, 并随时间延长作用增强;大豆异黄酮50、100、400 mg·kg-1 灌胃给药均明显升高雌性小鼠脾指数和淋巴细胞转化的刺激指数, 对雄性小鼠则无明显作用;大豆异黄酮100、400 mg·kg-1 明显抑制小鼠ESC 艾氏肉瘤生长, 同时50、100、400 mg·kg-1 均降低异常增高的脾指数, 增加NK 细胞活性。结论 大豆异黄酮明显抑制YAC-1 细胞和小鼠ESC 艾氏肉瘤的生长,同时增强非特异性免疫功能, 并可增强正常雌性小鼠免疫功能。 相似文献
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对不同慢压射速度条件下真空辅助对AZ91D镁合金压铸件组织及力学性能的影响进行了评估。在联合有自行改进的TOYO真空系统的TOYO BD-350V5型冷室压铸机上制备片状AZ91D镁合金压铸件。研究发现,充型时型腔真空压力随着慢压射速度的升高呈现3次方增长,导致真空辅助对压铸件中气孔的降低能力随着慢压射速度的降低而下降。常规和真空压铸件中压室预结晶组织(ESC)含量随着慢压射速度的变化趋势相似。在较低慢压射速度时,真空压铸件拉伸性能受ESC含量的影响很大,随着慢压射速度的升高,真空压铸件中气孔含量的影响将变得显著。 相似文献
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K.R.C. Soma Raju Nadimul Haque Faisal D. Srinivasa Rao S.V. Joshi G. Sundararajan 《Surface & coatings technology》2008,202(9):1636-1644
Surface engineering approaches are being increasingly employed for enhancing the effective life of twist drills with a view to reduce machining costs. The electro-spark coating (ESC) technique provides a promising means of depositing wear resistant coatings that can potentially enhance the performance of these tools. However, it is often necessary to also optimize the machining conditions for coated tools to achieve an enhanced tool life. In the present investigation, varying spindle speeds were employed at a fixed vertical feed to evaluate the performance of WC-8Co ESC coated HSS drills in comparison to bare HSS drills. The number of holes drilled before reaching a preset average flank wear (0.5 mm), or catastrophic failure of the drill, was taken as the measure of tool life. The drill flank wear, monitored at regular intervals, as well as the cutting torque and thrust measured for all holes, were considered to be the key criteria for optimizing the cutting conditions. Results indicate that the WC-8Co coated drill tool life can be increased by a factor of more than 5, depending on the machining conditions selected. Furthermore, flank wear of the drill was found to increase rapidly at the end of drill life. Cutting torque data was also found to provide a useful indicator for predicting the end of tool life. 相似文献
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概述了中国机械工程学会铸造分会成立 40年来 ,经过初创阶段、恢复阶段和成长阶段的风雨历程。回顾和总结了学会工作关于理事会组成、学术年会、国际会议、编辑出版、展览及国际交流等各项工作情况。从中可以清晰地看到 ,40年来学会团结广大铸造工作者 ,在推动我国铸造业发展的同时 ,自身向着国际一流的学术团体不断迈进 相似文献
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焊接裂纹应力与磁记忆信号关系的实验研究 总被引:1,自引:0,他引:1
焊接裂纹产生的应力集中区是焊接构件在服役过程中最为危险的一个薄弱环节,对这个环节进行有效的安全评估,具有重要意义。金属磁记忆技术是近年来发展的一种全新的无损检测方法,它可以在地磁环境下检测铁磁构件的应力集中,从而诊断出产生(或可能产生)裂纹的危险区域。利用磁场中的高斯方程,对管线钢焊接裂纹的应力和金属磁记忆信号之间的关系模型进行了初步探讨,然后利用预制的焊接裂纹对此关系模型进行了研究预测,分析结果表明:此关系模型可满足应力检测的精度要求。 相似文献