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短流程等温淬火初始温度对组织及性能的影响
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作者 曲迎东 张震 +2 位作者 尤俊华 苏睿明 李荣德 《沈阳工业大学学报》 EI CAS 北大核心 2020年第2期174-178,共5页
为了研究短流程等温淬火的初始温度对铸件组织和性能的影响,采用消失模铸造工艺制备铸件.当铸件分别冷却到1 173和1 223 K初始温度时,放入50%KNO3+50%NaNO2淬火介质进行等温处理,然后空冷至室温.结果表明,铸件中出现了珠光体,ADI-1223和... 为了研究短流程等温淬火的初始温度对铸件组织和性能的影响,采用消失模铸造工艺制备铸件.当铸件分别冷却到1 173和1 223 K初始温度时,放入50%KNO3+50%NaNO2淬火介质进行等温处理,然后空冷至室温.结果表明,铸件中出现了珠光体,ADI-1223和ADI-1173的硬度分别为381和366 HV.当载荷为10 N时,ADI-1223的摩擦系数为0. 289,磨损体积为71. 3×10^-5 mm^3;ADI-1173的摩擦系数为0. 273,磨损体积为83. 7×10^-5 mm^3.当载荷为12 N时,ADI-1223的摩擦系数为0. 242,磨损体积为114. 1×10^-5 mm^3;ADI-1173的摩擦系数为0. 213,磨损体积为136. 5×10^-5 mm^3.因此,ADI-1223的硬度高于ADI-1173,摩擦系数大于ADI-1173,磨损量小于ADI-1173. 展开更多
关键词 流程等温淬火 初始温度 组织 性能 珠光体 硬度 摩擦系数 磨损体积
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提高汽车模具零件加工精度与效率的方法 被引量:7
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作者 尧军 《模具工业》 2016年第6期67-70,74,共5页
通过对加工工艺流程和装配工艺流程的分析,找出影响汽车模具零件制作精度的因素,通过改善模具零件的装夹方式、加工顺序、加工条件和优化装配淬火流程,在保证单件加工尺寸精度的同时强调过程检验,以达到提高模具零件制作精度的目的。
关键词 等高垫铁 淬火流程 过程检验 模具零件
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浅谈提高汽车模具加工效率
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作者 蒋云宏 《河南建材》 2019年第5期304-305,共2页
文章通过对汽车模具加工装配工艺的分析,给出了汽车模具合理的加工工艺、加工流程及后期维护等,这些方法可以优化装配过程中硬件条件和装配工艺,提高汽车模具加工效率,从而实现汽车模具零件的高精度制造,减少生产时间和成本,促进汽车模... 文章通过对汽车模具加工装配工艺的分析,给出了汽车模具合理的加工工艺、加工流程及后期维护等,这些方法可以优化装配过程中硬件条件和装配工艺,提高汽车模具加工效率,从而实现汽车模具零件的高精度制造,减少生产时间和成本,促进汽车模具加工行业的发展。 展开更多
关键词 等高垫铁 淬火流程 过程检验 模具零件
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Study on Technology for Quenching Catalytic Pyrolysis Gas
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作者 Lu Weimin 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2011年第1期58-63,共6页
This article describes the application of technology for quenching catalytic pyrolysis gas at the Daqing commercial CPP test unit and the Shenyang commercial CPP production unit.On the basis of results for application... This article describes the application of technology for quenching catalytic pyrolysis gas at the Daqing commercial CPP test unit and the Shenyang commercial CPP production unit.On the basis of results for application of the Shenyang CPP unit this paper puts forward an improved process flow scheme for quenching the pyrolysis gas and made calculations using the process flowsheet software.Case Ⅰ of the process flow scheme,which is designed for full circulation of slurry,intends to use the pyrolysis light oil and fresh feed oil as the quenching media with the product slurry oil and fresh feedstock being discharged from the quench cooler bottom and routed directly to the reactor so that the fresh feed oil can be preheated prior to pyrolysis.Case Ⅱ of the process flow scheme intends to adopt recycle oil as the quenching medium with the product slurry and recycle oil being discharged from the quench cooler bottom to the fractionator,which then delivers the slurry from the bottom.These two cases for improving the process flow diagram can all effectively control the density and viscosity of the quenching medium to secure the smooth operation of quench cooler. 展开更多
关键词 catalytic pyrolysis process quenching medium CPP gas
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Experimental Study of Heat Transfer for a Rotating Cylinder Water Jet Impingement Quenching
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作者 Mozumder Aloke Kumar Mitsutake Yuichi Monde Masanori 《Journal of Energy and Power Engineering》 2013年第3期411-422,共12页
Transient heat transfer has been experimentally investigated for subcooled water jet impingement quenching of a hot rotating stainless steel cylinder. Temperatures beneath the impinged surface were measured during que... Transient heat transfer has been experimentally investigated for subcooled water jet impingement quenching of a hot rotating stainless steel cylinder. Temperatures beneath the impinged surface were measured during quenching and used to estimate surface temperature and surface heat flux by using a developed numerical inverse solution of heat conduction. Heat flux reached its maximum value just after the WF (wetting front) (visible leading edge of boiling region) started moving from stagnation towards the circumferential region. WF moved in a non-uniform manner in angular direction on the hot rotating surface. With the increase of surface velocity, heat flux decreased. Higher surface velocity moved away the produced vapor bubbles and reduced the solid-liquid contact time which made it one-dimensional heat conduction from multi-dimensional, that reduced heat flux. The generated boiling curve from the estimated heat flux showed a reasonable agreement with existing studies. The surface maximum heat flux (maximum value in each cycle) distribution trend with radial position is entirely comparable with the static surface critical heat flux in literature. An explosive to a sheet like flow patterns were observed with the decrease of surface temperature. The flow patterns were followed by the intensity of sound during quenching. 展开更多
关键词 Heat conduction inverse solution jet impingement.
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