C型多点成形压机机架结构有限元分析和优化设计

本文根据C型多点成形压机机架结构、受力状况,以三维实体为单元,建立了压力机机身有限元模型和机身结构优化的数学模型。有限元分析表明,本模型行之有效,优化结果理想。     

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...     

C型多点成形压机机架结构有限元分析和优化设计

本文根据C型多点成形压机机架结构、受力状况，以三维实体为单元，建立了压力机机身有限元模型和机身结构优化的数学模型。有限元分析表明，本模型行之有效，优化结果理想。     

基于OptiStruct的闭式压力机组合机身的拓扑优化

通过拓扑优化寻找机身材料的合理布置,以闭式压力机组合机身为研究对象,利用SolidWorks建立机身的三维模型,然后导入到HyperMesh中,建立有限元分析模型。采用变密度法,以静力学分析为基础,定义材料的密度为设计变量,设置不同的约束条件和目标函数,通过Opti Struct求解器对机身进行拓扑优化。通过对比两种方案的优化结果,改进机身的结构,并对优化后的模型进行静力学和模态分析,验证了优化后的压力机机身符合实际使用要求。优化后压力机机身重量减少7.6%,实现了机身的轻量化,节约了成本,提高了企业的竞争力。     

基于Optistruct的伺服压力机机身拓扑优化

利用Hypermesh软件中的Optistruct模块建立了伺服压力机机身的三维有限元模型[1],对机身进行了静力和模态分析.应用渐进结构优化算法对机身进行了基于位移、应力和频率约束的拓扑优化,在满足压力机性能要求的条件下减轻了机身重量.为机身的合理设计与改进提供了可靠的依据.     

SP-160开式压力机机身的有限元分析及优化

通过对SP-160型开式压力机机身的受力进行有限元分析及计算,研究在公称压力下机身各部位的变形和应力分布,依此对机身结构进行优化设计。使用SolidWorks进行机身的有限元三维模型的创建,利用ANSYS和SolidWorks的接口直接导入ANSYS Workbench,对机身进行强度和刚度分析,根据分析结果在SolidWorks中完成机身三维模型结构的改进,从而达到减轻自重、降低成本的目的。     

基于Hypermesh的液压机机身结构优化设计

针对液压机机身刚强度不足和偏重问题,运用基于传力路径的结构优化方法,对其进行改进。首先根据压机三维模型建立其有限元模型,进行静态刚强度分析,确定了机身结构中的薄弱环节,然后运用拓扑优化方法,获得了机身的最佳材料分布和结构概念方案,最后运用尺寸优化方法对机身进行详细设计,获得优化的机身结构。结果显示,优化的机身在满载工况下最大位移减小36%,喉口处最大应力减小38.1%,同时本体结构质量减小了12.67%,提高了压机性能,节约了材料,达到了液压机机身结构优化的设计目标。     

JD36-630型压力机机身有限元分析与测试

以JD36-630型压力机为例,利用ANSYS软件,根据闭式组合机身特点,建立有效的计算模型,对其进行强度和刚度分析,获得机身应力和变形规律;对JD36-630机身进行结构测试,与有限元分析结果对比,修正模型,为有限元分析与优化提供实际参考.     

开式压力机机身受力分析及优化

为了提高开式压力机机身的力学性能,以某开式压力机机身为例,运用Solidworks建立其仿真模型,运用有限元分析软件对其进行静力分析。依据分析结果对机身局部结构进行优化分析,从而得到机身局部结构的合理参数,为压力机的优化设计提供了一种新的思路与理论依据。     

龙门式压力机机身的有限元分析与优化

对龙门式压力机机身进行静、动态有限元计算、分析。在此基础上对机身进行结构优化,并进一步分析优化后的机身。比较原机身与优化后机身的计算结果,完成对优化方案的验证。     

硬质合金可转位刀片槽型有限元分析及研究

利用有限元软件 ANSYS构建出具有复杂截面槽型的硬质合金可转位刀片三维有限元模型。该有限元模型更接近可转位刀片的真实形状 ,并通过切削力试验获得切削力 ,有利于对切削过程中的力学特性进行深入研究     

管材滚压剪切有限元分析

基于DEFORM 3D有限元软件建立了管材滚压剪切的三维有限元模型,并对不同工艺参数下的管材滚压剪切过程进行了解析计算。选用Johnson-cook模型作为材料的断裂损伤模型,经过试算和比较得到合适的材料损伤参数。分析了进刀率、刀具楔角以及管材壁厚等参数对刀具的载荷、管材实际切断深度的影响规律。研究结果将为管材实际切割的参数设定提供理论依据。     

Thermal and mechanical modeling analysis of laser-assisted micro-milling of difficult-to-machine alloys

This study is focused on numerical modeling analysis of laser-assisted micro-milling (LAMM) of difficult-to-machine alloys, such as Ti6Al4V, Inconel 718, and stainless steel AISI 422. Multiple LAMM tests are performed on these materials in side cutting of bulk and fin workpiece configurations with 100-300 μm diameter micro endmills. A 3D transient finite volume prismatic thermal model is used to quantitatively analyse the material temperature increase in the machined chamfer due to laser-assist during the LAMM process. Novel 2D finite element (FE) models are developed in ABAQUS to simulate the continuous chip formation with varying chip thickness with the strain gradient constitutive material models developed for the size effect in micro-milling. The steady-state workpiece and tool cutting temperatures after multiple milling cycles are analysed with a heat transfer model based on the chip formation analysis and the prismatic thermal model predictions. An empirical tool wear model is implemented in the finite element analysis to predict tool wear in the LAMM side cutting process. The FE model results are discussed in chip formation, flow stresses, temperatures and velocity fields to great details, which relate to the surface integrity analysis and built-up edge (BUE) formation in micro-milling.     

Use of a coupled explicit—implicit solver for calculating spring-back in automotive body panels

LS-DYNA3D, an explicit code, and LS-NIKE3D, an implicit code, have been coupled to facilitate the finite element (FE) modelling of sheet metal forming. The explicit FE code is used to model the forming process, in which the deformable blank contacts rigid tools. The implicit FE code is used to model the subsequent spring-back which occurs after the tooling is removed. In this way, the explicit code with its robust handling of contact during forming is combined with the implicit code and its large time steps during spring-back. The result is an efficient method for solving even very large (>20 000 deformable elements) sheet forming models. Three examples of the application of this method are given.     

A 3D FE model with plastic shot for evaluation of equi-biaxial peening residual stress due to multi-impacts

A 3D multi-impact finite element (FE) model for evaluation of peening residual stress is presented. Combined peening factors by Kim et al. are applied to the 3D symmetry-cell originally contrived by Meguid et al. To describe the feature of multi-impacts, concepts such as FE peening coverage, impact sequence and cycle-repetition are introduced. We successfully extracted the equi-biaxial stress from the simulations of diverse single-cycle and multi-cycle impacts. At four impact locations of FE symmetry-cell, surface and maximum residual stresses converge to equi-biaxial stress, and convergence improves with the number of repetitions of cycle. Impact velocity needed for comparing the FE solution with the XRD result is determined from the Almen arc height and coverage. It is further found that the simulation set with plastic shot produces residual stress consistent with the experimental XRD result.     

Simulation of tube wrinkling in electromagnetic compression

Wrinkle formation at electromagnetic tube compression was simulated using finite element (FE) method. Three-dimensional (3D) calculations were performed using a staggered coupling scheme between the electromagnetic and structural sides of the problem. Introducing the tube’s contour imperfections into the FE model makes the simulation of the wrinkle formation possible. The results show good correspondence with the experiments.     

Finite element modeling of power spinning of thin-walled shell with hoop inner rib

A 3D elasto-plastic finite element（FE） model of power spinning of thin-walled aluminum alloy shell with hoop inner rib was established under software ABAQUS. Key technologies were dealt with reasonably. The reliability of the FE model was verified theoretically and experimentally. The forming process was simulated and studied. The distribution of the thickness and stress, and the variations of spinning force were obtained. The workpiece springback was analyzed with ABAQUS/Standard. The results show that the FE model considering elastic deformation can not only be used to analyze the workpiece springback in the complex spinning process, but also serve as a significant guide to study the local deformation mechanism and choose the reasonable parameters.     

摩擦片背板精冲三维数值模拟及参数优化

针对精冲二维数值模拟的局限性,在有限元软件Deform-3D中建立摩擦片背板的三维精冲模型。采用Normalized Cockroft&Latham断裂准则,分析了成形过程中的静水应力、金属流动速度分布和发展趋势。通过数值模拟获得最佳冲裁间隙值为料厚的0.6%,其结果为提高精冲件质量提供了依据。     

基于有限元的管道裂纹漏磁检测仿真分析

提出一种油气管道裂纹漏磁场检测的数学分析方法。先根据麦克斯韦方程组推导出漏磁场数据分析模型。其次,利用三维有限元分析原理在Ansys环境下建立数学仿真模型。再将仿真结果与实际测试数据进行比较,确定该方法的可靠性。最后,通过仿真分析得出了裂纹几何参数(深度和宽度等)对漏磁信号特征的影响规律,并给出它们的关系曲线。该方法为实际利用漏磁场分布检测油气管道裂纹提供了重要的依据。     

基于ANSYS Workbench的百米重轨冷却过程温度场有限元分析

基于传热学及有限元理论,采用SolidWorks三维建模软件,建立60 kg/m、U75V重轨三维瞬态非线性有限元模型。采用ANSYS Workbench对重轨轧制后自然空冷过程中的温度场进行有限元数值模拟。结果表明:重轨在冷却过程中及终冷时刻,轨头的温度始终最高,轨腰、轨底依次降低,两端部分其温度较中部温度低。重轨在冷却过程中及终冷时刻,其横截面上的温度均不相同,其主要是受重轨的固态相变与重轨异型截面的影响。