共查询到20条相似文献,搜索用时 93 毫秒
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针对薄壁件加工过程中易产生变形等问题,提出了利用有限元法对铣削过程进行三维仿真的方法,重点研究了LS-DYNA的动态接触算法,建立了薄壁件铣削加工的有限元模型,对工件变形及切削力的变化规律进行了分析。最后,利用分析结果对铣削参数进行调整与优化,可以减小工件变形,保证加工精度。 相似文献
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GH4169高温合金的薄壁钻孔与厚壁钻孔相比有特殊性,运用ABAQUS软件进行钻削GH4169高温合金薄壁件的仿真,研究钻削加工过程中钻削参数和工件厚度对钻削力的影响规律及变化特征,分析应力的分布规律。结果表明:钻削初期,横刃的挤压和主切削刃切削长度的增加使钻削力和扭矩增大;稳定钻削阶段,横刃切出后,主切削刃切削长度不变切削直径增加,钻削力和扭矩稳定增加;钻削后期,副切削刃参与切削,主切削刃切削长度减小,轴向钻削力和扭矩减小,但副刃与孔壁的挤压摩擦,曲线波动较大;钻削速度、进给量及工件厚度的增加都会导致轴向钻削力和扭矩的增加;钻削时的最大应力分布在横刃和主切削刃与工件的接触部位。 相似文献
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金属薄壁盒形件在拉深成形过程中,由于模具结构和工艺条件的影响,成形过程中法兰区常发生起皱现象,在生产实践中消除这些问题能够显著降低生产成本和提高产品质量。以NUMISHEET’93国际会议的标准考题之一薄壁方盒形件为例,使用有限元软件ABAQUS模拟研究了模具圆角、润滑条件、压边力,以及板坯形状等因素对法兰区起皱的影响规律,得到了一些改善方盒形件成形质量的工艺措施。 相似文献
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在分析现有文献有关铣削加工力学模型的基础上,利用有限元分析软件ANSYS10.0,针对铝合金薄壁板进行铣削力求值及变形分析.对薄壁件加工变形有限元分析过程进行关键技术讨论,为实际切削做出理论性的探索. 相似文献
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Journal of Mechanical Science and Technology - The idea of integral calculus is used in traditional milling force prediction methods. In the traditional method, the milling cutter is divided into... 相似文献
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Shaogang Liu L. Zheng Z.H. Zhang D.H. Wen 《The International Journal of Advanced Manufacturing Technology》2006,28(7-8):653-658
In order to optimize the positions of the locators in peripheral milling of a thin-walled workpiece, a finite element model
along with an accurate cutting forces model is proposed in this paper. The finite element model takes into account the thickness
variations of the workpiece in peripheral milling. The locators on the secondary locating surface directly influence the surface
errors in peripheral milling of thin-walled workpiece, so this paper deals with the optimization of the positions of the locators
on the secondary locating surface. A method including two steps is presented. In the first step, the initial positions of
the locators are determined by adding the locators at the position with the maximum deformation. In the second step, a heuristic
algorithm is proposed to optimize the positions of the locators. Finally, a simulation example is used to illustrate the method. 相似文献
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为了研究航空薄壁整体结构件高速铣削加工中的整体加工变形,建立了基于ABAQUS/Standard有限元核心求解器的数值仿真系统,并对相关关键技术进行了研究.基于该系统研究了薄壁整体结构件铣削加工全过程,得到了加工过程中应力场、温度场的分布规律,以及加工完成后结构件的整体加工变形规律.通过模拟值与实验值对比,在误差允许范围内模拟结果是可以接受的,为薄壁整体结构件的加工变形分析提供了一种有效的方法. 相似文献
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Xuewei Zhang Tianbiao Yu Wanshan Wang Kornel F. Ehmann 《Machining Science and Technology》2016,20(3):406-424
High-speed machining of thin-walled workpiece is widely used in aerospace industry. To optimize the machining parameters in milling operations, the related process stability is required to be predicted. Compared to the existing two-dimensional (2D) milling stability model, a more completed three-dimensional (3D) regenerative process stability prediction model of thin-walled workpiece is presented based on the newly developed dynamic model. The efficiency and accuracy of the regenerative milling stability can be improved in the presented 3D model. The analysis procedure of the stability of flexible dynamic milling is developed in details. The 3D stability lobes are calculated according to the full discretization method and direct integration scheme. To verify the accuracy of presented 3D stability model, the thin-walled workpiece milling sound pressure signal and surface quality are determined in experiments. 相似文献
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V. S. Sooraj Jose Mathew 《The International Journal of Advanced Manufacturing Technology》2011,56(9-12):951-958
This paper discusses an experimental approach to assess the machining characteristics in microscale end milling operation through a systematic experimentation procedure. Microchannels were machined on brass plates using a carbide end mill of 1?mm diameter to analyze the effect of chip load (feed per tooth) and cutting speed on the surface roughness, specific cutting pressure, and cutting forces during microend milling operation. The tangential and radial components of forces were analyzed with the help of a three-dimensional model using the force signals acquired through KISTLER dynamometer. Feed per tooth and the interaction of cutting speed and chip load were identified as the critical parameters affecting the surface roughness of microchannel. Applying the concept of elastic recovery on the side wall surface of microchannels, the minimum chip thickness during the above micromilling operation was evaluated as 0.97???m, and the result was validated by the drastic increase in specific cutting pressure and erratic behavior of cutting forces below a chip load of 1???m. 相似文献