共查询到18条相似文献,搜索用时 156 毫秒
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硬质合金可转位车刀刀片的力学特性分析 总被引:1,自引:0,他引:1
为了深入研究切削过程中可转位刀具的力学特性,以硬质合金可转位车刀刀片为例,采用三维有限元方法对金属的切削加工过程进行模拟计算。考虑实际刀片几何形状及其安装角度,基于三维建模软件SolidWorks,建立了硬质合金可转位刀片三维立体模型;通过切削力试验测得切削力,利用内嵌于SolidWorks之上的COSMOS\works对该刀片加载求解,进行应力场分析。结果表明,利用有限元方法对硬质合金可转位刀片分析的结论与其实际加工状况较为相符,为可转位刀片的优化设计提供了一定的方法和依据。 相似文献
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基于金属材料塑性变形理论,利用有限元分析软件,建立了金属切削过程中的晶体变形模型,对二维正交金属切削过程中的晶体塑性变形进行了数值模拟。将仿真结果与实验数据进行了对比,验证了相关理论和模型的有效性。 相似文献
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基于任意拉格朗日-欧拉(ALE)方法,建立了金属切削的有限元模型,并对金属切削过程进行了三维动态模拟。ALE方法克服了模型中网格大变形问题,准确地模拟了工件材料受刀具挤压后失效、脱离过程,客观地描述了工件材料失效面的产生过程。通过对不同进给量下切削过程的模拟,得到了进给量与刀具主切削力之间的关系。通过与经验公式对比,验证了数值模型、模拟方法的正确性。 相似文献
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斜角切削过程的三维热—弹塑性有限元分析 总被引:2,自引:0,他引:2
基于大变形理论和虚功原理,建立了斜角切削加工过程的三维热一弹塑性有限元模型.分析和研究了涉及切削加工有限元模拟的关键技术.采用通用有限元求解器ABAQUS/Explicit对斜角切削过程进行了有限元模拟,分析了切削过程中切屑的形成过程及其形貌、三维切削力的变化情况,以及应力、应变、切削温度和已加工表面残余应力的分布规律.通过与试验数据的比较,证明了所建立有限元模型的正确性.斜角切削过程的三维热一弹塑性有限元模拟研究为铝合金高速切削加工的工艺参数优化、刀具几何参数的合理选择提供了参考. 相似文献
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M.-G. Her K.-S. Hsu W.-S. Yu 《The International Journal of Advanced Manufacturing Technology》2002,19(10):743-751
In this paper, the analysis and design of telerobotics based on the haptic virtual reality (VR) approach for simulating the
clay cutting system is proposed. The main components of the approach include a user interface, networking, simulation, and
a robot control scheme. The telerobotics for the clay cutting system and the environment is simulated by a haptic virtual
system that enables operators to feel the actual force feedback from the virtual environment just as they would from the real
environment. The haptic virtual system integrates the dynamics of the cutting tool and the virtual environment whereas the
handle actuator consists of the dynamics of the handle and the operator on the physical side. The control scheme employs a
dynamical controller which is designed considering both the force and position that the operator imposes on the handle and
feedforward to the cutting tool, and the environmental force imposed on the cutting tool and the feedback to the handle. The
stability robustness of the closed-loop system is analysed based on the Nyquist stability criterion. It is shown that the
proposed control scheme guarantees global stability of the system, with the output of the cutting tool approaching that of
the handle when the ratios of the position and the force are selected correctly. Experiments in the virtual environment on
cutting a virtual clay system are used to validate the theoretical developments. 相似文献
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The state of a surface region after machining is definitely affected by cutting parameters, such as cutting speed, feed rate, tool nose radius, tool rake angle and the presence of a cutting fluid, which plays a major role in determining friction at the tool–chip interface. The aim of the present study is to develop a finite element model based on the general-purpose nonlinear finite element code MSC.Marc by MSC.Software Corporation. This software is capable of simulating the cutting process of low-pressure turbine disks of aircraft jet engines from its very beginning to steady-state conditions. Basically, the present analysis is a coupled thermo-mechanical dynamic-transient problem, based on the update Lagrangian formulation; no pre-defined path is given for the separation of the chip from the workpiece, since material deformation occurs as a continuous indentation performed by the rigid tool. In addition to the cutting parameters, the main inputs in this analysis are material constitutive data, the friction coefficient at the toolchip interface and the cutting tool temperature. All the relevant variables, like stresses, strains, temperatures, chip shape and residual stresses, are predicted in a wide range of cutting conditions. The results from the model are compared to some basic theories of metal cutting and to an experimental study, concerning orthogonal cutting of steel AISI 316L. Concerning the specific case of turning process of nickel alloy Inconel 718 low-pressure turbine disks, the calculated residual stress are compared to experimental measurements from real machined disks. 相似文献
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Pradeep L. Menezes Ilya V. Avdeev Michael R. Lovell C. Fred Higgs III 《The International Journal of Advanced Manufacturing Technology》2014,73(5-8):875-885
A fundamental understanding of the tribology aspects of machining processes is essential for increasing the dimensional accuracy and surface integrity of finished products. To this end, the present investigation simulates an orthogonal metal cutting using an explicit finite element code, LS-DYNA. In the simulations, a rigid cutting tool of variable rake angle was moved at different velocities against an aluminum workpiece. A damage material model was utilized for the workpiece to capture the chip separation behavior and the simultaneous breakage of the chip into multiple fragments. The friction factor at the cutting tool–workpiece interface was varied through a contact model to predict cutting forces and dynamic chip formation. Overall, the results showed that the explicit finite element is a powerful tool for simulating metal cutting and discontinuous chip formation. The separation of the chip from the workpiece was accurately predicted. Numerical results found that rake angle and friction factor have a significantly influence on the discontinuous chip formation process, chip morphology, chip size, and cutting forces when compared to the cutting velocity during metal cutting. The model was validated against the experimental and numerical results obtained in the literature, and a good agreement with the current numerical results was found. 相似文献
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金属切削毛刺分类体系的研究及其应用 总被引:2,自引:0,他引:2
将金属切削毛刺生成同切削运动联系起来,提出并建立起切削运动-刀具切削刃毛刺分类体系,清晰地给出影响毛刺生成及变化的主要因素。将该分类体系应用于车削、钻削和磨削加工,表明切削运动-刀具切削刃毛刺分类体系定义明确、完整。简便易行。 相似文献
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基于DEFORM-3D的金属锯切过程力能仿真研究 总被引:1,自引:0,他引:1
运用金属切削力学理论与方法对圆锯机锯切过程的力能参数进行理论计算,得到锯切过程的平均锯切力和平均锯切功率。基于DEFORM-3D软件建立金属锯切有限元模型,仿真得到平均锯切力值,与理论计算得到的平均锯切力误差为3.5%;实验得到圆锯机主电动机锯切过程中的平均锯切功率值,与理论计算得到的平均锯切功率误差为3.8%。力能参数理论计算、DEFORM-3D有限元仿真、实验测试数据对比,表明用DEFORM-3D有限元研究金属锯切机理是一种可行的方法,为锯切机理的研究提供了参考。 相似文献
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基于正应力摩擦模型的金属切削有限元仿真 总被引:2,自引:0,他引:2
刀-屑摩擦模型是金属切削仿真的关键问题,采用基于前刀面正应力的摩擦系数模型能够真实反映刀-屑接触长度内的摩擦状况,通过仿真和试验证明,采用该模型可获得较好的仿真精度,而且通过降低工件材料的剪切流动应力能够较好地模拟切削液的润滑效果对切削过程的影响. 相似文献