基于ANSYS的80MN等温锻造液压机有限元分析

80MN等温锻造液压机是根据用户专有的工艺需求而设计的专用液压机,属于重型锻造装备。根据技术协议,要求设计出三维模型,然后采用三维软件SolidWorks对80MN等温锻造液压机进行建模,并利用有限元分析软件ANSYS分析优化液压机的机身结构,合理优化了结构布局和材料的利用率,为公称力在60MN～100MN范围间的等温锻造液压机的快速设计提供了参考和借鉴。     

20MN大型框架式液压机机身有限元分析及优化设计

针对20 MN大型数控框架式液压机机身CAD分析及优化,应用三维软件Solidworks建立了20 MN大型数控框架式液压机机身的三维模型,采用有限元分析模拟软件ANSYS建立了有限元计算模型,并进行静态刚强度分析.计算分析了机身的应力及应变,在此基础上构建了主体结构的优化计算模型,将机身进行了优化设计,并与初始设计进...     

基于ANSYS的环锻液压机结构优化分析

本文介绍了利用建模软件SolidWorks,设计模拟了环锻液压机机身结构,并利用有限元分析软件ANSYS对机身机构进行了受力仿真分析计算,得到了机身在满吨位压力下的应力和变形云图,通过结合材料性能,结合此类型液压机设计规范,对机身结构的高低应力和变形情况进行了结构优化分析。为该类环锻液压机的快速设计提供了理论支撑和可靠数据支持。     

基于Workbench的折边机机架分析与优化

以数控四边折边机机身为研究对象,通过三维建模软件建立数控四边折边机机身模型,根据其结构特点,利用有限元分析软件ANSYS Workbench17.0对其进行静力学分析,由分析结果对机身结构进行优化设计。仿真结果表明,改进后的机身在保证模尖直线度的基础上质量减轻2467kg,降低了数控四边折边机制造成本,提高产品竞争力。     

5000kN双梁式复合材料液压机结构设计与有限元仿真

为解决复合材料三梁四柱液压机结构轻量化与成形工艺零件厚度不均匀问题,设计一台5000kN新型双梁双抗偏载结构的液压机。使用SolidWorks建立机身初始结构模型,采用ANSYS Workbench对液压机模型进行静态有限元分析,得到机身主要部件的应力和位移的分布情况,确保机架的刚度和强度以及整体性指标达到使用要求。同时,在中心载荷和两种极限偏载工况下,对液压机结构进行强度和刚度校核,获得满足工程要求的新型双梁液压机结构。     

闭式单点高速压力机机身的有限元分析

运用三维设计软件Solidworks 2016建立了闭式单点高速压力机机身的3D模型,并根据其结构特点,利用有限元分析软件ANSYS Workbench15.0对其进行静力学分析和模态分析,得到机身的总变形云图、有效应力云图、机身前六阶固有频率及相应的振型图,并对模拟结果进行分析,为机身结构的优化设计提供必要的理论参考。     

模锻压力机机身结构与刚度分析

针对模锻压力机整体机身结构,通过三维建模软件建立1600t模锻压力机机身分析模型,并导入ANSYS有限元计算软件进行仿真分析。对机身及拉紧螺杆的几种状态进行分析计算和对比,获得了最为合理的结构形式。     

预紧力对组合机身刚度的影响

为了研究不同预紧力对压力机组合机身刚度的影响规律,以宁波精达DCP200-190高速压力机组合机身为研究对象,应用SolidWorks建立三维模型,并将模型导入ANSYS Work-bench中,根据其在工作过程中的受力特点,对组合机身添加负载及约束,对其进行静力学分析.分别取预紧力为1.0、1.5和2.0倍公称力,通...     

基于有限元的大吨位压力机立柱结构改进

通过有限元理论研究方法,针对1300t多连杆压力机采用全接触立柱和悬置立柱两种不同结构进行有限元分析.建立两种不同形式的机身三维模型,采用有限元分析软件ANSYS建立计算模型,并进行工作情况和预紧力情况下的静力学分析对比,验证采用悬置结构的可行性和安全性,并对立柱进行优化设计.设计结果为立柱悬置结构设计提供了理论依据.     

机械粉末成型压机的强度刚度计算与分析

运用SolidWorks软件对500t机械粉末成型压机主机及模架进行了实体建模,并运用ANSYS有限元分析软件对其进行了结构强度分析;通过分析获得机身和模架各模板应力和应变的分布情况,计算出相应的挠度刚度,在此基础上分析了机械粉末成型压机的机身和模架结构设计的是否合理,并做了相应改进。     

Effects of Post-weld Heat Treatment on Microstructure,Mechanical Properties and the Role of Weld Reinforcement in 2219 Aluminum Alloy TIG-Welded Joints

In as-welded state, each region of 2219 aluminum alloy TIG-welded joint shows diff erent microstructure and microhardness due to the diff erent welding heat cycles and the resulting evolution of second phases. After the post-weld heat treatment, both the amount and the size of the eutectic structure or θ phases decreased. Correspondingly, both the Cu content in α-Al matrix and the microhardness increased to a similar level in each region of the joint, and the tensile strength of the entire joint was greatly improved. Post-weld heat treatment played the role of solid solution strengthening and aging strengthening. After the post-weld heat treatment, the weld performance became similar to other regions, but weld reinforcements lost their reinforcing eff ect on the weld and their existence was more of an adverse eff ect. The joint without weld reinforcements after the post-weld heat treatment had the optimal tensile properties, and the specimens randomly crack in the weld zone.     

The First Phase of the SRIF Industrialized Base in ＂West Area＂ Has Been Put into Operation

After nearly two years＇ tense construction, the first phase of industrialized base of Shenyang Research Institute of Foundry （SRIF）, located at the Tiexi Casting and Forging Industrial Park in the west of Tiexi District, has now been completed and formally put into operation.     

Thermodynamics Study on the Decomposition of Chromite with KOH

Institute of Process Engineering, Chinese Academy of Sciences, China, has proposed a method for oxidative leaching of chromite with potassium hydroxide. Understanding the mechanism of chromite decomposition, especially in the potassium hydroxide fusion, is important for the optimization of the operating parameters of the oxidative leaching process. A traditional thermodynamic method is proposed and the thermal decomposition and the reaction decomposition during the oxidative leaching of chromite with KOH and oxygen is discussed, which suggests that chromite is mainly destroyed by reactions with KOH and oxygen. Meanwhile, equilibrium of the main reactions of the above process was calculated at different temperatures and oxygen partial pressures. The stable zones of productions, namely, K2CrO4 and Fe2O3, increase with the decrease of temperature, which indicates that higher temperature is not beneficial to thermodynamic reactions. In addition, a comparison of the general alkali methods is carried out, and it is concluded that the KOH leaching process is thermodynamically superior to the conventional chromate production process.     

Influence of Heat Treatment on Damping Behaviour of the Magnesium Wrought Alloy AZ61

The effect of isochronal heat treatments for 1h on variation of damping, hardness and microstructural change of the magnesium wrought alloy AZ61 was investigated. Damping and hardness behaviour could be attributed to the evolution of precipitation process. The influence of precipitation on damping behaviour was explained in the framework of the dislocation string model of Granato and Lücke.     

Effect of Rare Earth Doping on Impedance,Modulus and Conductivity Properties of Multiferroic Composites:0.5(BiLa_xFe_(1-x)O_3)–0.5(PbTiO_3)

The Lanthanum-doped bismuth ferrite–lead titanate compositions of 0.5(Bi LaxFe1-xO3)–0.5(Pb Ti O3)(x = 0.05,0.10,0.15,0.20)(BLxF1-x-PT) were prepared by mixed oxide method.Structural characterization was performed by X-ray diffraction and shows a tetragonal structure at room temperature.The lattice parameter c/a ratio decreases with increasing of La(x = 0.05–0.20) concentration of the composites.The effect of charge carrier/ion hopping mechanism,conductivity,relaxation process and impedance parameters was studied using an impedance analyzer in a wide frequency range(102–106Hz) at different temperatures.The nature of Nyquist plot confirms the presence of bulk effects only,and non-Debye type of relaxation processes occurs in the composites.The electrical modulus exhibits an important role of the hopping mechanism in the electrical transport process of the materials.The ac conductivity and dc conductivity of the materials were studied,and the activation energy found to be 0.81,0.77,0.76 and 0.74 e V for all compositions of x = 0.05–0.20 at different temperatures(200–300 °C).     

Quantitative Analysis of the Crystallographic Orientation Relationship Between the Martensite and Austenite in Quenching–Partitioning–Tempering Steels

The orientation relationships(ORs)between the martensite and the retained austenite in low-and medium-carbon steels after quenching–partitioning–tempering process were studied in this work.The ORs in the studied steels are identified by selected-area electron diffraction(SAED)as either K–S or N–W ORs.Meanwhile,the ORs were also studied based on numerical fitting of electron backscatter diffraction data method suggested by Miyamoto.The simulated K–S and N–W ORs in the low-index directions generally do not well coincide with the experimental pole figure,which may be attributed to both the orientation spread from the ideal variant orientations and high symmetry of the low-index directions.However,the simulated results coincide well with experimental pole figures in the high-index directions{123}_(bcc).A modified method with simplicity based on Miyamoto’s work was proposed.The results indicate that the ORs determined by modified method are similar to those determined by Miyamoto’method,that is,the OR is near K–S OR for the low-carbon Q–P–T steel,and with the increase of carbon content,the OR is closer to N–W OR in medium-carbon Q–P–T steel.     

Using Finite Element and Contour Method to Evaluate Residual Stress in Thick Ti-6Al-4V Alloy Welded by Electron Beam Welding

This work was to reveal the residual stress profile in electron beam welded Ti-6Al-4V alloy plates(50 mm thick) by using finite element and contour measurement methods.A three-dimensional finite element model of 50-mmthick titanium component was proposed,in which a column–cone combined heat source model was used to simulate the temperature field and a thermo-elastic–plastic model to analyze residual stress in a weld joint based on ABAQUS software.Considering the uncertainty of welding simulation,the computation was calibrated by experimental data of contour measurement method.Both test and simulated results show that residual stresses on the surface and inside the weld zone are significantly different and present a narrow and large gradient feature in the weld joint.The peak tensile stress exceeds the yield strength of base materials inside weld,which are distinctly different from residual stress of the thin Ti-6Al-4V alloy plates presented in references before.     

Microstructures and Tensile Properties of Ultrafine-Grained Ni–(1–3.5) wt% SiC_(NP) Composites Prepared by a Powder Metallurgy Route

Silicon carbide nanoparticle-reinforced nickel-based composites(Ni–Si CNP),with a Si CNPcontent ranged from1 to 3.5 wt%,were prepared using mechanical alloying and spark plasma sintering.In addition,unreinforced pure nickel samples were also prepared for comparative purposes.To characterize the microstructural properties of both the unreinforced pure nickel and the Ni–Si CNPcomposites transmission electron microscopy(TEM) was used,while their mechanical behavior was investigated using the Vickers pyramid method for hardness measurements and a universal tensile testing machine for tensile tests.TEM results showed an array of dislocation lines decorated in the sintered pure nickel sample,whereas,for the Ni–Si CNPcomposites,the presence of nano-dispersed Si CNPand twinning crystals was observed.These homogeneously distributed Si CNPwere found located either within the matrix,between twins or on grain boundaries.For the Ni–Si CNPcomposites,coerced coarsening of the Si CNPassembly occurred with increasing Si CNPcontent.Furthermore,the grain sizes of the Ni–Si CNPcomposites were much finer than that of the unreinforced pure nickel,which was considered to be due to the composite ball milling process.In all cases,the Ni–Si CNPcomposites showed higher strengths and hardness values than the unreinforced pure nickel,likely due to a combination of dispersion strengthening(Orowan effects) and particle strengthening(Hall–Petch effects).For the Ni–Si CNPcomposites,the strength increased initially and then decreased as a function of Si CNPcontent,whereas their elongation percentages decreased linearly.Compared to all materials tested,the Ni–Si CNPcomposite containing 1.5% Si C was found more superior considering both their strength and plastic properties.     

Directional Growth of Tin Crystals Controlled by Combined Solute Concentration Gradient Field and Static Magnetic Field

A new method was introduced to achieve directional growth of Sn crystals. Microstructures in liquid(Pb)/liquid(Sn) diffusion couples were investigated under various static magnetic fields. Results show that the β-Sn crystals mainly reveal an irregular dendritic morphology without or with a relatively low static magnetic field(B0.3 T). When the magnetic field is increased to 0.5 T, the β-Sn dendrites close to the final stage of growth begin to show some directional character. With a further increase in the magnetic field to a higher level(0.8–5 T), the β-Sn dendrites have an enhanced directional growth character, but the dendrites show a certain deflection. As the magnetic field is increased to 12 T, the directional growth of the β-Sn dendrites in the center of the couple is severely destroyed. The mechanism of the directional growth of the β-Sn crystals and the deflection of the β-Sn crystals with the application of static magnetic field was tentatively discussed.     

Growth Kinetics of Single Inclusion Particle in Molten Melts

On the basis of the single-particle framework, a new theory on inclusion growth in metallurgical melts is developed to study the kinetics of inclusion growth on account of reaction and collision. The studies show that the early growth of inclusion depends on reaction growth and Brawnian motion collision, and where the former is decisive, the late growth depends on turbulence collision and Stokes＇ collision, and where the former is dominant; collision growth is very quick during the smelting process, lessened in the refining process, but nearly negligible in the continuous casting process.