共查询到20条相似文献,搜索用时 125 毫秒
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薄壁零件的加工变形问题一直是机械制造技术中迫切需要解决的技术难题.从影响零件加工变形的因素出发,以具体产品为例,对薄壁零件的车削加工工艺进行研究,给出了解决车削薄壁零件加工问题的方法,效果较好. 相似文献
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薄壁零件的刚性差,加工中容易变形,不易保证零件的加工质量。通过分析薄壁零件的特点,分析了防止和减少加工过程中薄壁零件变形的工艺措施。同时提出采用高速切削技术及有限元仿真技术,可以提高薄壁零件的加工效率及加工质量。 相似文献
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针对薄壁零件自身强度低、加工易变形的问题,通过优化调整切削参数的大小,进而调整动态切削力大小和控制切削状态,使因切削力影响造成薄壁零件的加工变形量能满足公差要求,且使加工状态始终处于稳定,降低切削震动造成的变形,从而实现薄壁零件的高精、高速、高效加工. 相似文献
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针对薄壁零件刚性差,制造过程中在夹具夹紧力和切削力的作用下,容易产生加工变形,严重影响加工精度和表面质量等问题,分析和阐述了提高薄壁零件加工精度的装夹设计方法.研究了基于遗传算法和有限元方法的薄壁零件夹具布局和夹紧力的同步优化设计方法,以一壳体薄壁零件为例,进行了其夹具的装夹方案设计以及夹具布局和夹紧力的同步优化.结果表明该优化方法可以有效地降低由于装夹不当所引起的工件变形程度, 提高工件的加工精度. 相似文献
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薄壁零件精密数控铣削关键技术研究 总被引:1,自引:0,他引:1
针对薄壁零件铣削加工误差产生的主要原因,从制造工艺方面,分析和讨论了薄壁零件数控铣削加工过程中涉及到的工艺路线、走刀策略、切削参数以及装夹方式等对加工质量和加工效率的影响,介绍了减小薄壁零件数控铣削加工变形,指出了提高其加工精度和表面质量的技术方法和工艺措施. 相似文献
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薄壁零件的车削加工技术研究 总被引:1,自引:0,他引:1
针对薄壁零件加工中容易出现变形的特点,分析了薄壁工件车削中产生变形的原因并主要就薄壁零件的夹具设计提出相应的解决方案,同时列举了一些典型薄壁零件的夹具方案,作为工程实践中的参考。 相似文献
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王森林 《锻压装备与制造技术》2014,(3):82-83
介绍薄壁类零件的加工,通过对筒体段节的特点以及加工进行分析,总结了薄壁类零件加工工艺方法。指出只有根据零件的具体结构特点,设计合理的加工工艺路线、选择合适的刀具、确定合理的切削速度才能真正解决薄壁零件的加工变形。 相似文献
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薄壁件加工过程因切削力波动较大可导致切削过程不平稳,需对加工工艺进行优化。建立了镍基合金Inconel718薄壁件铣削加工数控编程优化模型,模型由数控编程、材料数据库和数控加工仿真3个模块组成。在UG中建立工件实体模型,并生成相应NC加工代码;基于Power Law本构方程,考虑材料热力学动态性能和材料分离准则对切削力和切削温度的影响,采用有限元仿真软件AdvantEdge FEM获得镍基合金车削加工的切削力和切削温度等参数;将工件毛坯模型、NC加工代码、材料数据导入Production Module中,对加工过程进行优化。结果表明:利用优化后的数控程序进行加工,可减小切削力波动,有助于改善薄壁件加工过程中的稳定性。 相似文献
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薄壁锥形件旋压成型中应力、应变场的有限元分析 总被引:1,自引:1,他引:0
应用大型有限元分析软件ANSYS10.0建立了薄壁锥形工件旋压成形的有限元模型,以显式动力学求解器LS-DYNA为基础模拟了其旋压成形过程,分析了工件成形过程中的变形和应力特点,研究了应力和应变等因素对工件成形质量的影响规律。结果表明:应力、应变图显示了成形过程中工件应变和应力的分布特点与规律,为解决工件旋压成形过程中的问题提供了依据;旋压数值模拟有助于发现旋压变形中存在的旋压成形中容易产生断裂、翻边、褶皱和失稳等缺陷问题及产生的原因;旋压力振荡和减薄率过大是工件旋压断裂的主要因素;在旋压工艺中可以通过优化减薄率、转速和进给量等工艺参数有效控制锥形工件旋压成形质量;分析结果对于旋压模具的优化设计和旋压工艺参数合理选择提供了可靠的理论基础。 相似文献
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分析薄壁箱体零件的特征,阐述了零件的加工工艺过程及计算机辅助编程的相关设置,总结了加工难点及防变形加工技巧。通过实践验证:在不使用专用夹具的情况下能够顺利加工该零件,并能保证加工精度。 相似文献
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Tool positioning error (TPE) characterisation in milling 总被引:1,自引:1,他引:1
Yann Landon Stphane Segonds Pierre Lascoumes Pierre Lagarrigue 《International Journal of Machine Tools and Manufacture》2004,44(5):457-464
Where the geometrical features so permit, the {workpiece–work-holding fixture} assembly is generally considered to be infinitely rigid. The {tool–tool-holder–spindle} assembly and the machine axes are then deformed under the action of the cutting forces. This deformation leads to a positioning error of the tool in relation to the theoretical position. With the aim of taking this positioning error into account, the inaccuracies obtained during end milling and side milling were experimentally modelled from the cutting conditions used for a given machine/mill/material triplet (TriM). Our “Virtual Worker” then used these models to predict machining errors according to the type of machining and to compensate for them. 相似文献
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This paper proposes a new approach to analyze the stability of a cutting process. Previously, most studies have generally assumed the work-piece to be rigid and have, therefore, ignored work-piece deformation. In analyzing, the stability of the cutting process, these studies simply considered the dynamic equation of the tool. However, in practice, the work-piece undergoes deformation as a result of the application of an external force by the cutting tool. This deformation changes the chip thickness and has an effect on the critical chip thickness. Consequently, this study proposes a novel stability analysis method for the turning process in which deformation of the work-piece is considered. The cutting, which takes place in the turning process, is described using partial differential equations, and a set of dynamic equations is developed by considering the interaction between the tool and the work-piece. Having performed Laplace transformation, the stability of the cutting system can be analyzed in terms of the work-piece length, radius, natural frequency, deflection, slenderness ratio, cutting point, and material. The relationship between the critical chip width and the cutter spindle speed is investigated under a range of cutting and work-piece conditions. The analytical results for the current flexible work-piece are compared with those for a rigid work-piece. It is found that the critical chip width of the flexible work-piece is always greater than that of the rigid body. 相似文献
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针对航空航天制造中经常会用到的一些尺寸大、刚度低、易变形的大型薄壁件,开发出了一种多点柔性定位工装,根据这种柔性工装和工件的特点,提出了一种能够对这类零件的定位/支承布局方式进行有效优化的方法,提高了零件的加工质量,节省了这类零件制造的工装成本。 相似文献
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N. Ravichandran 《Journal of Materials Engineering and Performance》2003,12(6):653-655
During hot working operation, the work-piece deforms to the shape of the die geometry at the imposed deformation rates and
temperatures. Deformation processing maps, obtained based on the concepts of Dynamic Materials Modeling, can be used to identify
optimum deformation conditions. Dynamic Recrystallization (DRX) is shown to be the operating softening mechanism at these
optimum deformation conditions, and results in predictable microstructures. The model proposed for explaining the microstructural
evolution during DRX is extended to predict the resulting microstructure based on the information about the deformation loads
and work-piece temperatures. The model predictions are validated on Al and Cu. This model can be applied for on-line process
control, provided the metal forming equipment is appropriately instrumented. 相似文献