推动制造业高质量发展是构建新发展格局的重中之重,是实现质量强国战略的关键之举。为了解制造业企业质量管理相关研究现状与热点分布,以CNKI与Web of Science数据库中的中外文献为研究对象,运用CiteSpace 6.2.R6软件对文献进行计量分析...推动制造业高质量发展是构建新发展格局的重中之重,是实现质量强国战略的关键之举。为了解制造业企业质量管理相关研究现状与热点分布,以CNKI与Web of Science数据库中的中外文献为研究对象,运用CiteSpace 6.2.R6软件对文献进行计量分析,总结其研究脉络与演进趋势发现,国外对制造业企业质量管理的研究更加广泛与深入,质量成本管理是国内该领域研究的一大特色,下一阶段国内外研究的重点都集中在智能制造与工业4.0上。国内外研究趋势基本相同,我国对制造业企业质量成本的研究不存在明显滞后性,下一阶段应加强对研究广度与深度的探索,为制造业企业质量管理研究提供参考。展开更多
One dimensional(1D) and three dimensional(3D) ultrasound sources were applied to the solidification process of Mg_(71.5)Zn_(26.1)Y_(2.4) alloy.The acoustic spectra were in-situ measured, based on which the cavitation ...One dimensional(1D) and three dimensional(3D) ultrasound sources were applied to the solidification process of Mg_(71.5)Zn_(26.1)Y_(2.4) alloy.The acoustic spectra were in-situ measured, based on which the cavitation intensities and dynamic solidification mechanism were further investigated. With the increase of ultrasonic dimension and amplitude, the primary Mg_(3)Zn_(6)Y phase was significantly refined from petals to nearly pentagonal shape. The sound field measurements showed that the transient cavitation played a decisive role in generating a high local undercooling, which facilitated the formation of icosahedral clusters and promoted the nucleation of primary Mg_(3)Zn_(6)Y phase. The morphological transition of(α-Mg+Mg_(3)Zn_(6)Y) eutectic from lamellar to anomalous structure occurred under 3D ultrasonic condition. The stable cavitation took the main responsibility because the high pressure excited by nonlinearly oscillating bubbles induced the preferential nucleation of α-Mg phase rather than Mg_(3)Zn_(6)Y phase. As compared with its static values, the tensile strength and compression plasticity of this alloy were increased by the factors of 1.9 and 2.1, and its corrosion resistance was also improved with the corrosion current density decreased by one order of magnitude.展开更多
The mechanical properties, microstructure and tensile fracture of Ti-6.5AI-IMo-IV-2Zr large section bars produced by three diffrent forging processes were investigated. The results show that when billet forging and fi...The mechanical properties, microstructure and tensile fracture of Ti-6.5AI-IMo-IV-2Zr large section bars produced by three diffrent forging processes were investigated. The results show that when billet forging and finish forging were conducted by means of fullering at high and low temperature of r-region, respectively; the microstructure of forged bar is coarse Widmanstaten structure; the mechanical properties, especially the reduction of cross-sectional area, are poor, and the room temperature tensile fracture presents a brittle feature. While billet forging was carried out by upset-fullering at high temperature of the r-region, and finish forging was proceeded through fullering at （a＋fl）-region, the microstructure of forged bar was a duplex structure, the bar has better comprehensive mechanical properties, and the room temperature tensile fracture reveals a ductile feature. In order to obtain qualified Ti-6.SAI-IMo-IV-2Zr alloy bar, it is the key that as-cast microstructure should be completely broken during billet forging, and the forging temperature and deformation are also well controlled upon finishing forging.展开更多
针对2013年7月22日甘肃岷县漳县发生的MS6.6地震序列,采用CAP(Cut and Paste)方法反演了岷县漳县6.6级地震及部分强余震的震源机制解。结果显示,6.6级主震最佳双力偶解节面Ⅰ走向189°,倾角51°,滑动角142°;节面Ⅱ参数走向...针对2013年7月22日甘肃岷县漳县发生的MS6.6地震序列,采用CAP(Cut and Paste)方法反演了岷县漳县6.6级地震及部分强余震的震源机制解。结果显示,6.6级主震最佳双力偶解节面Ⅰ走向189°,倾角51°,滑动角142°;节面Ⅱ参数走向305°,倾角61°和滑动角46°,主震为逆冲兼走滑型,矩心震源深度均为7km;8次MS≥3.0余震震源机制解向NE倾的节面Ⅱ的优势倾角约为52°,表现出逆冲分量大的特性。结合震区的活动构造、余震及烈度分布,判定节面Ⅱ代表了相应地震的发震断层面,地震序列震源机制的特性反映了与临潭-宕昌断裂带相似的活动特征,分析认为,岷县漳县6.6级地震的发生与临潭-宕昌断裂的活动可能存在一定的相关性。展开更多
为了克服人工计算方法耗时费工、计算量大、计算精度低的缺陷,实现屏蔽泵轴向力计算的快捷性和简便性,基于Visual C++ 6.0软件平台,考虑影响屏蔽泵轴向力的综合因素,编写出屏蔽泵轴向力计算程序,为屏蔽泵轴向力计算提供了便捷的工具.本...为了克服人工计算方法耗时费工、计算量大、计算精度低的缺陷,实现屏蔽泵轴向力计算的快捷性和简便性,基于Visual C++ 6.0软件平台,考虑影响屏蔽泵轴向力的综合因素,编写出屏蔽泵轴向力计算程序,为屏蔽泵轴向力计算提供了便捷的工具.本程序采用模块化的结构体系,每个模块对应界面,能灵活地实现人机对话,界面清晰,可以方便地进行参数优化设计计算.只要输入相应的设计参数,程序会自动显示出轴向力平衡的计算结果,简单快捷,与人工计算相比,大大提高了工作效率.通过真机轴向力实测与计算结果比对,计算结果与实验结果的相对误差在10%以内,证实程序计算结果具有良好的计算精度,实用性强.展开更多
文摘推动制造业高质量发展是构建新发展格局的重中之重,是实现质量强国战略的关键之举。为了解制造业企业质量管理相关研究现状与热点分布,以CNKI与Web of Science数据库中的中外文献为研究对象,运用CiteSpace 6.2.R6软件对文献进行计量分析,总结其研究脉络与演进趋势发现,国外对制造业企业质量管理的研究更加广泛与深入,质量成本管理是国内该领域研究的一大特色,下一阶段国内外研究的重点都集中在智能制造与工业4.0上。国内外研究趋势基本相同,我国对制造业企业质量成本的研究不存在明显滞后性,下一阶段应加强对研究广度与深度的探索,为制造业企业质量管理研究提供参考。
基金financially supported by National Natural Science Foundation of China (nos.52088101 and 52130405)Basic Research Project of Shaanxi Natural Science Foundation (no: 2021JCW-09 and 2023-JC-JQ-28)Key R&D Plan of Shaanxi Province-Key Industrial Innovation Chain Project (no: 2020ZDLGY13-03)。
文摘One dimensional(1D) and three dimensional(3D) ultrasound sources were applied to the solidification process of Mg_(71.5)Zn_(26.1)Y_(2.4) alloy.The acoustic spectra were in-situ measured, based on which the cavitation intensities and dynamic solidification mechanism were further investigated. With the increase of ultrasonic dimension and amplitude, the primary Mg_(3)Zn_(6)Y phase was significantly refined from petals to nearly pentagonal shape. The sound field measurements showed that the transient cavitation played a decisive role in generating a high local undercooling, which facilitated the formation of icosahedral clusters and promoted the nucleation of primary Mg_(3)Zn_(6)Y phase. The morphological transition of(α-Mg+Mg_(3)Zn_(6)Y) eutectic from lamellar to anomalous structure occurred under 3D ultrasonic condition. The stable cavitation took the main responsibility because the high pressure excited by nonlinearly oscillating bubbles induced the preferential nucleation of α-Mg phase rather than Mg_(3)Zn_(6)Y phase. As compared with its static values, the tensile strength and compression plasticity of this alloy were increased by the factors of 1.9 and 2.1, and its corrosion resistance was also improved with the corrosion current density decreased by one order of magnitude.
文摘The mechanical properties, microstructure and tensile fracture of Ti-6.5AI-IMo-IV-2Zr large section bars produced by three diffrent forging processes were investigated. The results show that when billet forging and finish forging were conducted by means of fullering at high and low temperature of r-region, respectively; the microstructure of forged bar is coarse Widmanstaten structure; the mechanical properties, especially the reduction of cross-sectional area, are poor, and the room temperature tensile fracture presents a brittle feature. While billet forging was carried out by upset-fullering at high temperature of the r-region, and finish forging was proceeded through fullering at （a＋fl）-region, the microstructure of forged bar was a duplex structure, the bar has better comprehensive mechanical properties, and the room temperature tensile fracture reveals a ductile feature. In order to obtain qualified Ti-6.SAI-IMo-IV-2Zr alloy bar, it is the key that as-cast microstructure should be completely broken during billet forging, and the forging temperature and deformation are also well controlled upon finishing forging.
文摘针对2013年7月22日甘肃岷县漳县发生的MS6.6地震序列,采用CAP(Cut and Paste)方法反演了岷县漳县6.6级地震及部分强余震的震源机制解。结果显示,6.6级主震最佳双力偶解节面Ⅰ走向189°,倾角51°,滑动角142°;节面Ⅱ参数走向305°,倾角61°和滑动角46°,主震为逆冲兼走滑型,矩心震源深度均为7km;8次MS≥3.0余震震源机制解向NE倾的节面Ⅱ的优势倾角约为52°,表现出逆冲分量大的特性。结合震区的活动构造、余震及烈度分布,判定节面Ⅱ代表了相应地震的发震断层面,地震序列震源机制的特性反映了与临潭-宕昌断裂带相似的活动特征,分析认为,岷县漳县6.6级地震的发生与临潭-宕昌断裂的活动可能存在一定的相关性。
文摘为了克服人工计算方法耗时费工、计算量大、计算精度低的缺陷,实现屏蔽泵轴向力计算的快捷性和简便性,基于Visual C++ 6.0软件平台,考虑影响屏蔽泵轴向力的综合因素,编写出屏蔽泵轴向力计算程序,为屏蔽泵轴向力计算提供了便捷的工具.本程序采用模块化的结构体系,每个模块对应界面,能灵活地实现人机对话,界面清晰,可以方便地进行参数优化设计计算.只要输入相应的设计参数,程序会自动显示出轴向力平衡的计算结果,简单快捷,与人工计算相比,大大提高了工作效率.通过真机轴向力实测与计算结果比对,计算结果与实验结果的相对误差在10%以内,证实程序计算结果具有良好的计算精度,实用性强.
