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1.
以某大型数控龙门铣床床身结构为研究对象,使用ANSYS Design Explorer优化设计模块,将床身筋板厚度、砂孔直径作为主要的优化参数,在床身原强度和刚度不变的前提下对其进行轻量化设计。分析结果表明:经轻量化设计后,床身的总变形、应力、应变最大值有所下降且分布得到改善,质量减少了11.3%。 相似文献
2.
针对一款公称力为22000 kN的开式液压预弯机,在生产前检测其机身结构设计是否满足变形与应力的要求,并且在此基础上降低安全系数以优化结构和进行轻量化设计,将其三维模型进行一定简化。在有限元分析软件ANSYS-Workbench中对预弯机进行静力学分析,确定最大变形量和应力集中分布的结构位置。将对预弯机最大应力影响较大的上横梁焊件和基座焊件的侧板及筋板等4个结构尺寸设为参数,以质量最小为优化目标,约束最大应力和最大变形以及结构尺寸,建立目标函数的优化数学模型。以响应面分析法对预弯机进行轻量化设计,通过中心复合设计产生49组实验数据,筛选和优化后结果显示预弯机质量减轻8330 kg,应力与变形满足设计和材料要求。 相似文献
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生物体具有性能优异、轻质高效的结构形式,体现了材料的最优化分布,为机械结构的轻量化设计提供了原型与方法。通过总结轻质高效生物体结构的构型规律,应用于高速机床工作台筋板的结构仿生设计。利用Ansys的APDL参数化语言建立优化模型,确定工作台筋板的最优结构参数。结果表明,通过布置环形夹层筋板以及最大变形梯度方向上对角筋的方法是有效的,并使结构比刚度效能提高11.29%,从而实现结构的仿生轻量化。 相似文献
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《组合机床与自动化加工技术》2021,(6)
针对目前研究人员在进行立柱结构件优化设计时,重点放在立柱局部的结构或尺寸优化方面而对立柱内部筋板结构布局或整体结构布局研究不足,难以满足研发高精度、高可靠性重型机床对立柱高刚度、高抗振性、轻量化等综合需求,提出了组合赋权VIKOR法的重型机床动立柱设计优化方法。该方法综合考虑立柱传统结构、仿生结构、新材料等方面后设计了8种动立柱,然后利用有限元软件对其进行优化并计算了关键性能评价指标数值,最后使用组合赋权VIKOR法找出了最优方案。优化后的动立柱和原方案相比,质量减轻10.4%,1阶固有频率提升74.7%,总体方向静变形量减小31%、热变形量减小13.8%,表明优化后动立柱静态性能和动态性能显著提升,验证了组合赋权VIKOR法的重型机床动立柱设计优化方法有效可行。 相似文献
5.
为了满足新型研球机变径沟槽研球板均匀加压的需要,设计一种偏心加压固定板压盘。通过分析固定板压盘的功能需求,采用联想类比法,提出固定板压盘的结构设计方案;运用数值仿真技术,建立固定板压盘的有限元模型,分析压盘的静态与模态特性,获得压盘的变形图、应力云图和固有频率与振型,验证了压盘结构设计的可行性。针对固定板压盘的偏心距大小和进球缺口到压盘中心的距离大小,以结构变形和应力最小为优化目标,通过参数化建模,基于响应面法对压盘进行了参数优化,获得压盘的最优结构参数。分析结果显示:优化后的固定板压盘,加载后最大变形减小,压力分布更加均匀。通过结构方案的创新和采用现代设计方法,实现了新型结构件的设计要求。 相似文献
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丁曾飞侯骏飞董博赵磊 《锻压装备与制造技术》2023,(3):37-40
为了满足锻压机上梁结构在工作过程中高强度、轻量化的设计要求,提出了一种多目标优化方法。该方法将锻压机上梁结构的11个参数作为设计变量,并经过参数相关性分析和筛选后,得到对上梁结构结性能影响灵敏度较高的3个设计变量。通过以质量最小、变形最小和应力最大为优化目标,成功地实现了对上梁结构进行多目标优化。研究结果表明,在满足应力和变形的两个条件下,降低了上梁结构的质量,达到多目标优化设计要求,符合现代机械设备绿色制造和设备轻量化设计的发展方向。 相似文献
8.
《组合机床与自动化加工技术》2019,(5)
针对某工程用变速箱壳体轻量化问题。基于Solidworks建立其三维模型并联立ANSYS对壳体进行静态分析,得到壳体的应力、变形云图,从而确定壳体危险点的位置及力学变化特性,同时通过第四强度理论对壳体进行强度校核,在保证强度的基础上利用响应面优化法对壳体进行优化设计,通过输入变量与输出变量的灵敏度关系,以壳体质量最小、总变形最小和应力最小为优化目标并建立变速箱壳体结构优化模型,对壳体进行尺寸优化设计,依据有限元响应面优化结果,确定了优化后变速箱壳体模型。优化结果表明,优化后壳体的应力和变形基本没有变化,重量减轻了6.03%,为变速箱壳体结构轻量化设计提供参考。 相似文献
9.
针对汽车覆盖件铸造基体的冲压模具,研究了汽车冲压模具轻量化优化方法。以汽车后地板为研究对象,借助数值模拟软件,对拉延成形工序进行数值模拟,得到模具成形过程所受载荷。将分析得到的凸模最大载荷映射到划分网格的模具型面上,建立静力分析有限元模型,得到原模具的最大变形位移为0. 0324 mm。采用汽车冲压模具轻量化优化方法,对后地板模具的凸模进行结构优化,得到优化后凸模的质量为2772 kg,优化后的模具最大变形位移为0. 0297 mm。与原模具相比,优化后模具质量降低20%,最大变形位移减小。数值模拟结果表明,本方法在保证模具刚度的前提下,可以有效地降低模具的质量。 相似文献
10.
以卧式加工中心立柱为研究对象,首先利用ANSYS Workbench平台构建其有限元模型,并对其进行静动态特性分析.研究分析结果发现立柱过大的质量将影响其整体性能的提升,是原设计的薄弱环节.然后对模型结构尺寸进行了灵敏度分析,得到对立柱性能影响较大的灵敏尺寸,并将其设置为最终优化设计变量.最后以灵敏尺寸作为优化参数、立柱质量作为优化目标、最大变形量和一阶固有频率作为约束条件对立柱进行了轻量化设计,在保证立柱刚度及固有频率的基础上显著地减小了立柱的质量,达到了轻量化设计的目的. 相似文献
11.
Coherent second phase often exhibits anisotropic morphology with specifi c orientations with respect to both the second and the matrix phases. As a key feature of microstructure, the morphology of the coherent particles is essential for understanding the second-phase strengthening eff ect in various industrial alloys. This letter reports anisotropic growth of coherent ferrite from austenite matrix in pure iron based on molecular dynamics simulation. We found that the ferrite grain tends to grow into an elongated plate-like shape, independent of its initial confi guration. The fi nal shape of the ferrite is closely related to the misfi t between the two phases, with the longest direction and the broad facet of the plate being, respectively, consistent with the best matching direction and the best matching plane calculated via the Burgers vector content(BVC) method. The strain energy calculation in the framework of Eshelby's inclusion theory verifi es that the simulated orientation of the coherent ferrite is energetically favorable. It is anticipated that the BVC method will be applicable in analysis of anisotropic growth and morphology of coherent second phase in other phase transformation systems. 相似文献
12.
C.J. Sun H.R. Geng Y.S. Shen X.Y. Teng Z.X. Yang 《金属学报(英文版)》2007,20(3):181-186
The rheology feature of Sb, Bi melt and alloys was studied using coaxial cylinder high-temperature viscometer. The results showed that the curve of torsion-rotational speed for Sb melt presents a linear relation in all measured temperature ranges, whereas for the Bi melt, the curve presents obvious non-Newtonian feature within the low temperature range and at relative high shear stress. The rheology feature of Sb80Bi20 and Sb20Bi80 alloy melts was well correlated with that of Sb and Bi, respectively. It is considered that the rheology behavior of Sb melt plays a crucial role in Sb80Bi20 alloy and that of Bi melt plays a crucial role in Sb20Bi80 alloy. 相似文献
13.
The effect of short-time aging in the temperature range between 400 and 1000 °C on the pitting corrosion behavior and mechanical property of a novel lean duplex stainless steel(LDSS) 2002 was investigated through the potentiostatic critical pitting temperature(CPT) tests and the Charpy impact tests. Both the pitting corrosion resistance and the toughness of aged specimens degraded due to the precipitation of detrimental secondary phases and the most significant reduction of CPT and impact energy emerged at 650 °C concurrently. The CPT of LDSS 2002 specimen aged at 650 °C decreased by 28 °C, and the impact energy dropped from 69 to 29 J/cm~2 compared with the solution-annealed sample. Transmission electron microscopy characterization showed that the main precipitates in LDSS 2002 were Cr_2N and M_(23)C_6 along the ferrite–austenite grain boundaries. 相似文献
14.
《中国铸造》2014,(6):537-538
The invention provides a method of making a mold which can reduce SOx generation rate while preventing decrease in hardening rate in the case of using sulfuric acid for a hardener composition. The method has a mixture step in which fire-resistant particles, a hardener composition and a binder composition are mixed to obtain a composition for a mold. The hardener composition contains sulfuric acid. In the mixture step, sodium carbonate is added. A molar ratio of the sulfuric acid to the sodium carbonate is 0.5 or more and 4.0 or less. 相似文献
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《机床与液压》2014,(12)
正1.Contents In order to promote the academic exchanges and technical communication of the research in the field of fluid power transmission and control,fluid control engineering specialized committee of the Chinese Society of Theoretical and Applied Mechanics will hold the 17th Conference of Hydrodynamic and Electromechanical Control Engineering on July 27-29,2014 in Tibet,Lhasa city. 相似文献
17.
《中国有色金属学会会刊》2014,(6)
正The Transactions of Nonferrous Metals Society of China,founded in 1991 and sponsored by The Nonferrous Metals Society of China,is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology,including mineral processing,extraction metallurgy,metallic materials and heat treatments,metal working,physical metallurgy,powder metallurgy,with the emphasis 相似文献
18.
<正>We are pleased to present this Special Issue of Transactions of Nonferrous Metals Society of China containing selected papers from the First Asian Conference on Aluminum Alloys(ACAA-2013),held in Beijing,China,13–17 October 2013.This conference has been initiated,with approval of 相似文献
19.
《中国有色金属学会会刊》2014,(9):F0003-F0003
The Transactions of Nonferrous Metals Society of China, founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, 1NSPEC, CA, METADEX, AJ and JICST. 相似文献
20.
Peng Liu Zhao-Kuang Chu Yong Yuan Dao-Hong Wang Chuan-Yong Cui Gui-Chen Hou Yi-Zhou Zhou Xiao-Feng Sun 《金属学报(英文版)》2019,32(4):517-525
The effect of heat treatment on the microstructures and mechanical properties of a newly developed austenitic heat resistant steel(named as T8 alloy) for ultra-supercritical applications have been studied. Results show that the main phases in the alloy after solution treatment are γ and primary MX. Subsequent aging treatment causes the precipitation of M_(23)C_6 carbides along the grain boundaries and a small number of nanoscale MX inside the grains. In addition, with increasing the aging temperature and time, the morphology of M_(23)C_6 carbides changes from semi-continuous chain to continuous network.Compared with a commercial HR3C alloy, T8 alloy has comparable tensile strength, but higher stress rupture strength. The dominant cracking mechanism of the alloy during tensile test at room temperature is transgranular, while at high temperature, intergranular cracking becomes the main cracking mode, which may be caused by the precipitation of continuous M_(23)C_6 carbides along the grain boundaries. Typical intergranular cracking is the dominant cracking mode of the alloy at all stress rupture tests. 相似文献