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阶梯轴铸钢件的铸造工艺设计及数值模拟 总被引:1,自引:1,他引:0
对阶梯轴铸钢件进行铸造工艺方案设计,包括分型面和浇注位置的选择,各项铸造工艺参数的确定以及浇注系统、冒口、冷铁的设计.根据铸件形状与结构特点,采用中注式浇注系统,内浇道放置在轴后的端面,并用一个内浇道对铸件进行浇注.将铸件划分为4个补缩区域进行冒口设计,并配合冷铁使用来实现铸件的顺序凝固建立铸件的三维模型,并运用ViewCast铸造模拟软件对铸件的凝固过程进行了模拟计算.初次模拟显示,在阶梯轴的凸台处与其临近连接的阶梯轴段会产生缩孔、缩松缺陷.根据数值模拟结果并结合理论分析,对铸造工艺方案进行了优化设计.通过增大冒口尺寸和高度、增设冷铁的方法,有效地消除了铸造缺陷,从而获得了合理的铸造工艺方案. 相似文献
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门框底衬铸钢件的铸造工艺设计及数值模拟 总被引:3,自引:3,他引:0
运用传统方法设计了门框底衬铸钢件的铸造工艺:包括分型面、浇注位置的选择、铸造工艺参数的确定以及浇注系统、冒口、冷铁的设计.根据铸件形状较复杂的特点,设计了两个内浇道;将铸件划分为4个补缩区域进行补缩,并配合冷铁来实现铸件的顺序凝固.用Pro/E软件建立了铸件的三维模型,采用ViewCast铸造模拟软件对铸件的凝固过程进行了模拟计算.模拟结果显示,在门框底衬凸台处会产生缩孔、缩松缺陷.根据数值模拟结果并结合理论分析,对铸造工艺方案进行了优化.通过改进工艺,最大程度地消除了铸造缺陷,从而获得了合理的铸造工艺方案. 相似文献
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以某球铁板形铸件为研究对象,用DISA线垂直分型的浇注系统设计方法设计了铸件的浇注系统,用均衡凝固理论设计了铸件冒口,用数值模拟方法对设计工艺进行了反复的对比优化,并实际浇注铸件进行了验证。研究表明:①用均衡凝固理论设计冒口时,不能只局限于用几何结构来划分结构分体,还要根据壁厚差的情况才能划分出合理的结构体。②底注式浇注系统并非总是最为平稳的浇注系统,而这一点是传统经验设计方法很难意识到的;用数值模拟的方法就容易寻求合理的浇注方案。③均衡凝固理论结合数值模拟方法是有效的铸铁件工艺设计手段。 相似文献
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用实例介绍了一项用于铸造生产的三维模拟技术,通过对金属液充型和凝固过程的数值模拟进行铸造工艺设计,从而在计算机上实现可视铸造过程,能保证既快又省地设计一个优化的铸造工艺.与传统的模数法,经验和试错的工艺设计不同,本模型是用铸件的凝固时间计算补缩系统.从一个铸件凝固模拟开始,根据凝固时间和被补缩的体积,计算冒口和冒口颈的尺寸和数量,再进行铸件加冒口的模拟计算,做必要的修正,直到获得满意的结果,最后根据铸件的临界壁厚、体积、充型速度和浇注温度等参数计算浇注系统.当整个系统设计完成后,模拟计算整个充型和凝固过程以验证设计,做必要的修正,直到获得一个能生产无铸造缺陷铸件的铸造工艺,即保证一次成功生产出合格铸件,节约了时间和成本. 相似文献
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A. A. Babakov 《Metal Science and Heat Treatment》1967,9(10):764-770
Conclusions Highly alloyed steels and alloys are produced in conformity with GOST or technical specifications in thick and thin sheets, beams and channels, bars, hot-rolled and cold-rolled pipe, and rod. Castings are produced in the specialized plant of the Ministry of Chemical and Petroleum Machine Building.The technology of welding stainless steels and alloys is given in [15] and [16].TsNIIChERMET. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 10, pp. 43–50, October, 1967. 相似文献
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模具渗硼工艺及其发展应用 总被引:4,自引:0,他引:4
渗硼是提高模具使用寿命的重要途径,是在金属表面形成高硬度的金属硼化层,显著提高其耐磨性,且具有良好的耐热性和耐蚀性。近年来,随着渗硼工艺逐步改进和完善,已发展了复合渗、多元共渗及低温渗硼工艺,取得了良好的经济效果。 相似文献
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A. Yu. Tsivadze G. V. Ionova V. K. Mikhalko 《Protection of Metals and Physical Chemistry of Surfaces》2010,46(2):149-169
The possibility of using unique properties of lanthanides in the nanotechnology is demonstrated. The origination of linear
and nonlinear optical properties of lanthanide compounds with phthalocyanines, porphyrins, naphthalocyanines, and their analogs
in solutions and condensed state and the prospects of obtaining novel materials on their basis are discussed. Based on the
electronic structure and properties of lanthanides and their compounds, namely, optical and magnetic characteristics, electronic
and ionic conductivity, and fluctuating valence, molecular engines are classified. High-speed storage engines or memory storage
engines; photoconversion molecular engines based on Ln(II) and Ln(III); electrochemical molecular engines involving silicate
and phosphate glasses; molecular engines whose operation is based on insulatorsemiconductor, semiconductor-metal, and metal-superconductor
types of conductivity phase transitions; solid electrolyte molecular engines; and miniaturized molecular engines for medical
analysis are distinguished. It is shown that thermodynamically stable nanoparticles of Ln
x
M
y
composition can be formed by d elements of the second halves of the series, i.e., those arranged after M = Mn, Tc, and Re.
Prospects of using lanthanide superconductors in nanotechnology are considered. 相似文献
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金刚石、CBN有序排列及择优取向工具的研发及应用 总被引:1,自引:0,他引:1
有序排列/择优取向超硬材料工具的技术创新,将广泛适用于电镀、树脂、陶瓷、金属结合剂制品工具中,使用超硬材料颗粒在结合剂中均匀排列并择优定向,以最大潜能的发挥超硬材料各个方面固有的特性。并针对不同的加工对象,有选择性的使用超硬材料各自不同的特性,从而使超硬材料工具将以经济、高质与高效的优势替代传统的超硬材料工具并将进入新兴的加工领域,为生产企业带来新的发展机遇。本文将对有序排列与择优取向技术的研究现状及其在不同的金刚石工具中的应用做一阐述。 相似文献
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V. Kulikovsky V. Vorlí?ek M. Stranyánek R. ?tvrtlík A. Kurdyumov 《Surface & coatings technology》2008,202(9):1738-1745
Hydrogen-free amorphous and nanocrystalline films were prepared by magnetron sputtering of the SiC or Si targets. Mechanical properties (hardness, elastic modulus, intrinsic stress) and film structures were investigated in dependence on the substrate bias and temperature. It was found that both hardness and elastic modulus of all amorphous a-SiC films prepared at different substrate temperatures and biases are always lower than those for bulk α-SiC single crystal while the hardness of partially crystalline SiC films is higher and the elastic modulus lower than those for α-SiC one. In contrast, both hardness and elastic modulus of all amorphous Si films are always lower than those for nanocrystalline Si films which show approximately the same value as the Si single crystal. 相似文献