共查询到19条相似文献,搜索用时 134 毫秒
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根据金属塑性成形原理和滚珠旋压成形的工艺特点,利用MSC.Mentat/Marc软件建立了内螺纹铜管滚珠旋压工艺的三维弹塑性非线性有限元模型.模拟了管坯从开始接触到变形稳定阶段内螺纹铜管的成形过程,探讨了铜管成形过程金属流动的位移规律及应变分布. 相似文献
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内螺纹铜管滚珠旋压成形有限元模拟 总被引:1,自引:0,他引:1
根据金属塑性成形原理和滚珠旋压成形的特点,采用有限元软件MSC.Mentat/Marc建立了内螺纹铜管滚珠旋压工艺的三维弹塑性有限元模型.模拟了管坯从变形开始到变形稳定阶段不同滚珠压下量下内螺纹铜管的成形过程.将模拟得到的滚珠所受单位挤压力与理论分析值进行了比较,两者具有较好的一致性.以模拟结果为基础分析了滚珠压下量对内螺纹铜管成形的影响和滚珠与螺纹沟槽芯头的受力特点. 相似文献
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滚珠旋压技术作为旋压成形方法的一个分支,具有工艺方法简单、材料利用率高、产品成本低等优点,已成为国内外成形加工方法研究的热点。介绍了滚珠旋压成形工艺的原理、工艺参数及工艺特点,并对国内外研究现状进行了分析。 相似文献
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锻造成形机理非常复杂,数值模拟是目前塑性成形分析最有效的方法.本文介绍了锻造成形数值模拟基本理论,对几项直接影响计算精度及效率的关键技术,模具结构描述、动态摩擦条件、动态边界识别以及网格的划分与再划分,进行了分析和探讨.并利用DEFORM软件给出了实例. 相似文献
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基于动力显式有限元软件,以电磁离合器皮带轮为侧,开展了两个工序的旋压成形工艺的数值模拟,研究了旋压成形过程中材料变形情况,对成形件的应力应变分布进行了分析。模拟结果表明:采用旋压成形工艺,通过设置合理的进给量、芯模转速等参数,成形出的零件不仅形状和尺寸满足要求,而且芯模和旋轮所受载荷不大,旋轮最大载荷为540kN,芯模最大载荷为19kN。该研究对旋压带轮的非线性有限元分析和实际生产中设备的选择具有一定的参考和实用价值。 相似文献
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以DEFORM-3D实现花键轴精密冷滚轧成形模拟 总被引:1,自引:0,他引:1
使用有限元仿真软件DEFORM-3D,实现渐开线花键冷滚轧成形整个过程的数值模拟;针对金属大变形问题,DEFORM-3D提供了一个全自动的、优化的网格再划分功能,为充分利用此功能,采用间接方法实现渐开线花键冷滚轧成形过程的数值模拟,并对成形过程中工件与模具之间的相互关系、成形力和变形特点进行分析与研究,为模具及成形设备的设计提供了可靠依据. 相似文献
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提出一种内外局部约束高效滚轧成形内齿圈新工艺,完成相关工艺构架并分析了其成形过程内外滚轧模具及工件的运动特征。搭建了采用2对滚轧模具的内齿圈滚轧试验平台,实现了内齿圈滚轧;建立多对滚轧模具内外局部约束下内齿圈滚轧过程有限元模型,完成了采用2对滚轧模具和3对滚轧模具的内齿圈滚轧过程有限元分析。试验与有限元结果表明,齿形形状完整、轮廓清晰,达到了设计齿高要求,内齿圈滚轧成形工艺可行;和试验获得齿高相比,有限元模型对齿形预测误差小于5%;通过适当的模具和坯料几何参数调整,可控制成形齿高、改善端面成形质量。研究结果对内复杂型面零件的高效省力成形工艺具有理论意义和参考价值。 相似文献
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Ball bearings are widely employed mechanical components characterized by high precision and quality,and usually play important roles in various rotary machines and mechanisms.Many advanced applications require a deep understanding of their various kinematic and tribological characteristics that are essential to predict the fatigue endurance,relieve the vibration and minimize the power dissipation of ball bearings in particular applications.An angular contact ball bearing under a specified operating condition is simulated with the quasi-static/creepage analytical model proposed in the preceding article.The results demonstrate that the ball bearing is a statically determinate system.That the balls spin on both inner and outer races means the ball is controlled by neither the inner nor the outer raceway.The friction between the ball and raceway renders the inner and outer contact angles unequal.The larger the coefficient of friction is,the larger the angle deviation.The tangential traction perpendicular to the rolling direction due to the spin induces a gyro-like rotation of the ball with respect to the raceway even if no inertial effects are considered.The tangential elastic compliance of contacting surfaces gives rise to locked areas within the contact patch and transforms the sliding lines from circles into spirals.The differential slip due to the close conformity of the ball and raceway makes the sliding and traction distributions asymmetric,which will influence the location of the spinning center of the ball with respect to the raceway.The quasi-static/creepage model can be used to reveal the operating behaviors of ball bearings running under steady conditions and to optimize the design of ball bearings for specific applications. 相似文献
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内螺旋翅片铜管充液旋压成形加工的研究 总被引:4,自引:0,他引:4
对内螺旋翅片铜管的充液旋压成形加工进行了系统研究,着重分析了充液旋压过程中形成动压油膜的条件和特点,并建立了数学模型。实验结果表明:随着旋速和润滑油粘度的提高,流体动压润滑作用逐渐明显,被加工管的拉拔力减小,且加工后管外表面粗糙度值减小。 相似文献
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M. Sedighi M. Rasti 《The International Journal of Advanced Manufacturing Technology》2008,38(9-10):958-964
Mass production of CNG pressure vessels requires an accurate understanding of process effective parameters. In this paper, the finite-element method has been used to study the vessel manufacturing parameters. The FE model has been verified by experimental results. The entire manufacturing process, including deep drawing, redrawing and ironing, of an aluminum liner sample of CNG pressure vessels (without spinning) have been simulated. The deep drawing process has been modeled by using three types of dies: flat, conical and tractrix; then drawing force and wall thickness variations have been compared. In order to achieve the final diameter of the liner, the redrawing process has been implemented in a conical die. To obtain a uniform wall thickness, the ironing process has been simulated in two stages, and the required force and die angle for each process have been extracted. The result of this work presents an integrated perspective for decision-making on the manufacturing of CNG liners. 相似文献
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Xinghui Han Lin Hua 《Tribology International》2011,44(12):1742-1753
This paper aims to utilize finite element (FE) methods to predict the wear of dies and workpiece in cold rotary forging through systematically investigating the contact pressure and the contact slip distance. For this purpose, a 3D elastic-plastic FE model of cold rotary forging is developed using the FE code ABAQUS. Using this reliable 3D FE model, the evolution and the distribution of contact pressure and contact slip distance are investigated in detail. Consequently, a new insight into the wear that occurs at the surfaces of the dies and the workpiece is gained based on Archard's wear law. 相似文献
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《Tribology International》2012,45(12):1742-1753
This paper aims to utilize finite element (FE) methods to predict the wear of dies and workpiece in cold rotary forging through systematically investigating the contact pressure and the contact slip distance. For this purpose, a 3D elastic-plastic FE model of cold rotary forging is developed using the FE code ABAQUS. Using this reliable 3D FE model, the evolution and the distribution of contact pressure and contact slip distance are investigated in detail. Consequently, a new insight into the wear that occurs at the surfaces of the dies and the workpiece is gained based on Archard's wear law. 相似文献
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Longsheng Lu Dong Yuan Yong Tang Jiang Cheng 《The International Journal of Advanced Manufacturing Technology》2012,61(1-4):185-193
Miniature inner grooved copper tube (MIGCT) is widely applied in industries. To overcome the weak rigidity and strength of MIGCT during stepped tubes manufacturing, rotary swaging process was selected after comparing with radial forging process. The working principle of the rotary swaging was analyzed. A rotary swaging machine, whose workpiece feeding and clamping was respectively driven by an air cylinder and a finger cylinder, was designed. Experiments indicate that the MIGCT was slave rotating with forging dies during rotary swaging. Theoretical analysis was done to investigate the reason of the slave rotation. Experiments were carried out to verify the theoretical analysis. Furthermore, the influences of push force and clamping force on rotation speed were discussed. With the increase of clamping force, the rotation speed of MIGCT decreases gradually in a constant ratio. However, the push force influences the tube rotation speed slightly. In general, it found that an optimal rotation speed of MIGCT is beneficial to the manufacture of the stepped tube. 相似文献
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Yong Li Zechuan Xu Yong Tang Zhixin Zeng 《The International Journal of Advanced Manufacturing Technology》2010,47(9-12):1023-1031
The simulation of the cross-section forming of axially inner grooved copper tube (AIGCT) is conducted using finite element (FE) software MSC.Marc. The stress–strain distribution, metal flow rule, and contact force are analyzed based on the simulation and experimental results. The results show that gaps in the groove walls are caused not only by the diametric clearance between the inner wall of the copper tube and the mandrel but also the bending deformation of the copper tube. The cross-sectional geometry and surface characteristics of grooves are determined by the multi-tooth mandrel. Smooth transition of the mandrel teeth addendum improves the metal flow and makes contact force vary slightly, which is good for preventing mandrel from failure. Improving the mandrel surface finish can also improve the inner surface quality of AIGCT. The results help to optimize the forming process parameters and improve the forming quality. 相似文献
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This paper describes the temperature measurements in the EHL conjunction area comprising a longitudinally grooved steel ball and a sapphire disk under high slip conditions. The authors measured the temperatures of the oil film as well as both the disk and ball surfaces; furthermore, they estimated the temperature profile across the oil film by means of experimental values. The experimental results show that the temperature of the grooved ball surface increased considerably compared with that of a non-grooved ball. The temperatures of the faster surface for the grooved ball became sensitive to the slip ratio, whereas that for the non-grooved surface was almost constant. The temperature distribution had a higher value at the land zones and a lower one at the grooved zones. The temperature rise in the grooved zones varied qualitatively depending on the thermal conditions of both the sliding surfaces. 相似文献