共查询到20条相似文献,搜索用时 46 毫秒
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汽车工业在我国制造业中占有极为重要的地位,逆向工程、虚拟制造、CAD/CAM/CAE等一系列新技术、新方法,对汽车工业的发展发挥了巨大的推动作用。本文从CAD/CAM/CAE技术的角度,对其在整车设计开发、覆盖件生产和系列化零件模具制造中的应用做了简要分析,探讨了CAD/CAM/CAE技术的有效性和重要性,验证了CAD/CAM/CAE技术是汽车制造向着信息化、智能化、标准化发展,同时实现高质量、低成本、短周期的重要保障。 相似文献
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模具设计制造中CAD/CAE/CAM技术的应用研究 总被引:1,自引:0,他引:1
模具作为一种高附加值和高技术密集型的产品,其技术水平的高低成为衡量一个国家制造水平的重要标志,而模具工业的发展关键是模具技术的进步.本文着重介绍了模具CAD/CAE/CAM的现状,分析了模具CAD/CAE/CAM技术存在的主要问题,并探讨了其发展趋势. 相似文献
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UG软件系统功能强大,应用广泛,在模具设计和制造行业具有很大的优势.文章探讨了基于UG平台实现注塑模具CAD/CAM/CAE的方法和途径.基于企业生产实际需求,对探照灯灯头模具进行了设计加工,依此阐述了注塑模具CAD/CAM/CAE的实现过程. 相似文献
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曹振雨 《精密制造与自动化》2013,(2)
从概述汽车覆盖件模具设计与制造的发展现状展开,重点阐述了CAD/CAE/CAM设计技术,简要介绍了一种由CAD/CAE/CAM技术设计与制造汽车覆盖件的方法;汽车覆盖件模具设计制造的并行工程,其中包括覆盖件产品设计与模具设计的并行工程和计算机辅助制造(CAM)技术的并行工程与计算机辅助(CAD)设计技术;最后是汽车覆盖件模具设计制造的逆向工程,对逆向工程的设计流程进行描述。 相似文献
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CAD/CAM/CAE技术在模具生产中的应用 总被引:1,自引:0,他引:1
介绍了CAD/CAE/CAM技术在模具制造过程中的应用,阐述了CAD/CAE/CAM技术可以缩短生产周期,提高经济效益。 相似文献
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J. Campa-Molina† O. Blanco† A. Correa-Gomez M. Czank‡ & A. G. Castellanos-Guzman 《Journal of microscopy》2002,208(3):201-211
The domain structures of Zn3B7O13Cl, Zn3B7O13Br and Zn3B7O13I boracite single crystals were studied by means of polarized light in conjunction with electron microscopy. Single crystals of the three compositions were grown by chemical transport reactions in closed quartz ampoules, at a temperature of 900 °C and were examined by polarizing optical microscopy (PLM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). For both PLM and SEM, the same as‐grown samples were used without having to resort to metallization of the crystal faces. For TEM the single crystals were crushed and mounted on holey carbon films. Comparative electron microscope images were useful for revealing the domain structure of these ferroelectric/ferroelastic materials previously observed between the crossed polars of an optical microscope. X‐ray diffraction analysis of the pulverized crystals was performed for this triad of halogen boracites containing zinc as a common metal. 相似文献
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Stress intensity factors for pairs of diametrically opposite radial cracks on the inside of a jacketed pressurized hole in a thick cylinder have been calculated by using finite element technique. Burst tests on thick cylinder rock samples under above conditions have been performed and the KIC values for Antrim Shale and Limestone determined. The method is very convenient for rocks whose samples are often available in form of cylindrical bars drawn as cores from underground drilling. 相似文献
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基于太赫兹光谱的人参和西洋参鉴别 总被引:1,自引:0,他引:1
为了快速区分人参和西洋参,依据两者所含的人参皂苷在太赫兹波段具有不同指纹光谱,提出了一种基于人参皂苷的太赫兹光谱鉴别人参和西洋参的方法。采用MATLAB软件识别人参和西洋参的太赫兹光谱,同时根据太赫兹光谱特征并通过标准的主成分分析(PCA)区分出人参、西洋参。实验结果表明,基于太赫兹光谱的主成分分析可精确区分出人参、西洋参,并且还可以应用于其他类似物质的区分中。 相似文献
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R.B. Zipin 《Precision Engineering》1990,12(2)
European manufacturers have proposed a set of surface roughness parameters based on an examination of the variation in slope of the bearing ratio curve of a surface profile. It is shown, that the proposed procedure provides no useful information, and indeed is misleading, since the bearing ratio curve of even a normally-distributed random surface profile exhibits the expected variation in slope when plotted on rectangular coordinates. On the other hand, the desired information is readily obtained by a similar examination of the cumulative height distribution of a surface profile (the unity complement of the bearing ratio) when it is plotted on normal probability coordinates. 相似文献
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An Al86 Mn3 Be11 alloy cast into copper mould was subjected to metallographic investigation. The as-cast microstructure consisted of a quasicrystalline icosahedral phase (i-phase), Be4 AlMn phase and, occasionally, a hexagonal phase. Al-rich solid solution represented the dominant phase. The chemical compositions of phases were determined using AES. The composition of the Be4 AlMn slightly deviated from the stoichiometric composition, whereas the composition of the i-phase was approximately Al52 Mn18 Be30 , containing an appreciable amount of Be. The average composition of the hexagonal phase was Al66 Mn21 Be13 . Deep etching and particle extraction provided a deep insight into the three-dimensional morphology of the i-phase and the hexagonal phase, whereas Be4 AlMn was slightly attacked by the etchant. The i-phase was present predominantly in the form of dendrites and a rodlike eutectic phase. The hexagonal phase was primarily in the form of hexagonal platelets, whereas Be4 AlMn was rather irregular in shape. The morphology of the i-phase can be explained by predominant growth in 3-fold directions and the lowest energy of the 5-fold planes, leading to the faceting and adopting a pentagonal dodecahedron shape. The brightnesses of phases in the backscattered electron images were rationalized by determining their backscattering coefficients. TEM investigation showed considerable phason strain in the i-phase, and the polycrystalline nature of the Be4 AlMn phase. 相似文献
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Ali Asadi Ali Sadough Vanini Amin Jabbari 《Journal of Mechanical Science and Technology》2011,25(9):2179-2184
Lightweight laminated composites containing a ceramic front layer and a metallic backing layer were used in order to protect
people, moving equipment, and mobile vehicles from high velocity impact and the increased mobility of mobile vehicles. In
this study, by adding10 vol% SiC and 500 ppm MgO nanoscale particles on the microstructure of Al
2
O
3 matrix and applying optimum sintering conditions, ceramic performance against high-speed projectile impact was improved.
To perform this investigation, a number of target samples with two different types of front layers (alumina and Al
2
O
3-SiC-MgO nanocomposite ceramic) were produced. Impact tests were conducted on these samples using 7.62 mm projectiles with a velocity
of 820 ± 15 m/s. The amount of bulge and bending of the backing layer caused by impact tests was measured. The results of
the impact tests on the samples made of Al
2
O
3-SiC-MgO nanocomposite ceramics and alumina were also compared and analyzed. The results indicate that the substitution of Al
2
O
3-SiC-MgO ceramic layer — which is proffered in this paper — instead of pure alumina ceramic layer, decreases the areal-density of
the samples by at least 30% and improves mechanical properties by about a 60% increase in flexural strength and 100% growth
of the energy distribution factor, which impressively increases impact energy absorption. 相似文献
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Crack/particle interactions in alumina/silicon carbide nanocomposites have been investigated by scanning electron microscopy and transmission electron microscopy, with cracks induced by Vickers microindentation. Intergranular cracks are frequently deflected into grains by SiC particles on grain boundaries inclined to the average direction of crack propagation. This mechanism is proposed to explain the change in the fracture mode from intergranular fracture for monolithic alumina to predominantly transgranular fracture for the nanocomposites. Neither stress-induced microcracking around SiC particles nor significant crack deflection by intragranular particles was found to occur in the nanocomposites. It is argued that an addition of nanoparticles may not be a promising approach for increasing the toughness of alumina. 相似文献
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I. I. Smolyaninov H. Y. Liang C. H. Lee C. C. Davis V. Nagarajan† & R. Ramesh† 《Journal of microscopy》2001,202(1):250-254
Near-field optical second harmonic microscopy has been applied to imaging of the c/a/c/a polydomain structure of epitaxial PbZr x Ti1– x O3 thin films in the 0 < x < 0.4 range. Comparison of the near-field optical images and the results of atomic force microscopy and X-ray diffraction studies show that an optical resolution of the order of 100 nm is achieved. Symmetry properties of the near-field second harmonic signal allow us to obtain good optical contrast between the local second harmonic generation in c- and a-domains. Experimentally measured near-field second harmonic images have been compared with the results of theoretical calculations. Good agreement between theory and experiment is demonstrated. 相似文献