共查询到20条相似文献,搜索用时 31 毫秒
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汽车前轴精密辊锻成形过程的数值模拟 总被引:13,自引:1,他引:12
汽车前轴的精辊-模锻工艺是一种用小成形力锻造设备成形较大型前轴锻件的塑性加工技术,其工艺关键在于精密辊锻。前轴的精密辊锻分4个道次,是典型的局部成形工艺。辊锻工艺由于旋转的模具与辊锻件之间的接触区域在不断变化,一直以来成为数值模拟的难点。对4个道次的模具建立了模型,采用三维刚塑性有限元程序DEFORM-3D模拟了前轴精密辊锻工艺,分析了辊锻过程中金属变形的规律,研究了模具参数对成形质量的影响以及辊锻力矩的变化规律。模拟结果对于改进辊锻工艺设计、提高模具设计水平具有指导作用。 相似文献
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Precision forging of the helical gear is a complex metal forming process under coupled effects with multi-factors. The various
process parameters such as deformation temperature, punch velocity and friction conditions affect the forming process differently,
thus the optimization design of process parameters is necessary to obtain a good product. In this paper, an optimization method
for the helical gear precision forging is proposed based on the finite element method (FEM) and Taguchi method with multi-objective
design. The maximum forging force and the die-fill quality are considered as the optimal objectives. The optimal parameters
combination is obtained through S/N analysis and the analysis of variance (ANOVA). It is shown that, for helical gears precision
forging, the most significant parameters affecting the maximum forging force and the die-fill quality are deformation temperature
and friction coefficient. The verified experimental result agrees with the predictive value well, which demonstrates the effectiveness
of the proposed optimization method. 相似文献
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直齿圆柱齿轮精锻成形过程数值模拟及参数分析 总被引:5,自引:0,他引:5
采用三维有限元数值模拟方法分析了直齿圆柱齿轮的精锻成形过程,选择模拟表面单元数、加载步长、模数、齿数、齿轮高度等参数进行了多次模拟分析,根据模拟结果对比分析了以上诸参数对成形工艺的影响。确定了适宜的表面单元数目和加载步长值,较好地满足了模拟的需要。从数值模拟结果分析可知,在齿轮其他参数不变的情况下,锻造载荷随模数和齿数的增加而增加,模数的变化对载荷的影响显著;在对高度不同的齿轮成形过程的模拟分析中发现,在成形的初始阶段,高度越小载荷越大,在填充终了阶段,随高度增加载荷稍有增加。 相似文献
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T. S. Yang N. C. Hwang S. Y. Chang 《Journal of Mechanical Science and Technology》2007,21(10):1566-1572
The manufacture of gears by applying hot or cold bulk forming processes is a quite widespread production method due to its
well-known basic advantages such as material and time cost reduction and the increased strength of the teeth. However, the
associated process planning and tool design are more complicated. In the precision forging of gears, the workpiece volume,
the die design, the power requirement and careful processing are more critical than traditional forging technology. For complete
filling up, predicting the power requirement is an important feature of the near net-shape forging process. In this paper,
a finite element analysis is utilized to investigate the material properties such as yielding stress, strength coefficient
and strain hardening exponent effects on forming load and maximum effective stress. The adductive network was then applied
to synthesize the data set obtained from the numerical simulation. The predicted results of the maximum forging load and maximum
equivalent stress of bevel gear forging from the prediction model are consistent with the results obtained from FEM simulation
quite well. After employing the prediction model one can provide valuable references in prediction of the maximum forging
load and maximum equivalent stress of bevel gear forging under a suitable range of material parameters. 相似文献
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Sung-Yuen Jung Myung-Chang Kang Chul Kim Chang-Ho Kim Young-June Chang Seungr-Moo Han 《The International Journal of Advanced Manufacturing Technology》2009,41(7-8):684-693
Much research has been carried out in the manufacturing of helical gears by cold forging or by extrusion. Although cold forging is applied to some bevel, spur, and helical gears, problems in connection with the reduction forming load and tool life still make it difficult for these methods to be commercialized. In this study, focusing on reducing a load in forming helical gears, the extrusion of helical gears by two-step process is proposed. This process is composed primarily of extruding a billet to a spur gear and then twisting the previous spur gear extruded to a helical gear. Cylindrical billets of Cr-Mo steel(SCM 415) and aluminium alloy(Al60 series) were used as specimen materials for the experiments. The maximum loads obtained by upper-bound analysis and FEM are compared with the results of experiments. The loads of the analysis have good agreements with those of the experiment. The newly proposed method can be used as an advanced technique that remarkably reduces the forming load and replaces the conventional forming. 相似文献
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为了提高巨型模锻液压机同步控制系统的快速响应性,在300MN模锻液压机的基础上,针对800MN模锻液压机的特点重新设计了同步控制系统,并基于液压基础理论和动力学理论,联合建立了活动横梁运行时同步控制系统的整体数学模型。将原方案和现有方案进行了对比仿真,结果表明:新设计的800MN同步控制系统的响应特性较原方案的响应特性有较大幅度的改善,响应速度和动静态精度均有较大提高。 相似文献
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在直齿圆柱齿轮两步成形冷精锻工艺中 ,预锻模具齿形设计对改善材料填充性能 ,降低成形载荷具有重要意义。本文采用正交试验法与数值模拟技术相结合的方法 ,来解决预锻模具型腔优化设计问题。选取了描述预锻模具几何形状的 3个参数作为影响因素 ,以预锻终锻总载荷值为指标 ,通过有限元模拟分析来获得虚拟试验结果 ,最终确定预锻模具型腔几何形状参数的最佳值 ,为提高齿轮精锻成形质量提供有效依据。 相似文献
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300MN模锻水压机是我国国防和基础建设的关键设备,其中的同步平衡控制系统对提高模锻件的精度,改善液压机的受力状态,延长液压机本体和模具的寿命具有重要作用。通过建立同步平衡控制系统的数学模型,分析了影响控制系统的因素,并进行了优化。 相似文献
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同步控制系统是巨型模锻液压机上的关键部分,其同步控制性能的好坏将直接决定产品的质量。对活动横梁与导向立柱之间的配合间隙以及同步控制系统提供的工作压力与回油背压的压差对同步控制性能的影响进行了分析。结果表明:将立柱与侧梁的间隙控制在0.5mm到1.0mm之间可以满足锻件的精度要求;工作压力与回油背压的压力差越大,同步控制系统的动静态性能越好。为巨型模锻液压机同步控制系统的设计提供了参考。 相似文献
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螺旋锥齿轮精密模锻近净成形技术及制造工艺 总被引:4,自引:0,他引:4
采用先进近净成形技术的设计理念,探讨了螺旋锥齿轮齿面新的成形技术及其闭式、闭塞式精密热锻模具设计方法,并对汽车驱动桥螺旋锥齿轮采用精密模锻近净成形后的机械加工提出了一套新的工艺规程和加工方法.实践证明:该技术不仅可以提高锥齿轮的加工效率和材料利用率,而且还能提高锥齿轮的传动性能. 相似文献
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基于有限元的大型模锻压力机钢丝缠绕动梁预应力测试 总被引:1,自引:0,他引:1
预应力检测对重型压机钢丝缠绕工艺来说至关重要。钢丝缠绕压机动梁结构复杂,缠绕时表面应力场分布无明显规律,测试难度大,目前动梁缠绕工艺的应力测试尚属空白,给工艺质量评价及工艺控制带来不便。应用有限元法对400 MN航空模锻压机动梁缠绕进行模拟,研究动梁缠绕时端面的应力场分布特征,确定动梁端面存在环形的径向、周向单向应力区,据此制定应变测量贴片方案,解决了重型压机动梁缠绕过程中预应力测试的难题。有限元计算结果与试验结果基本吻合,确保动梁缠绕工艺质量达到设计要求,也证实了这种基于有限元的应力测试方法的可行性。该方法对于其他复杂工程结构的应力测试具有借鉴意义。 相似文献
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通过对汽车半轴锥齿轮冷摆辗精密成形技术进行研究,重点剖析了半轴锥齿轮毛坯的锻造工艺、冷摆辗成形工艺参数的选择、模具结构设计、金属切削加工和表面最终热处理等一系列关键技术,结果表明,采用冷摆辗精密成形技术的半轴锥齿轮具有精度高、强度高、啮合性能好,齿轮模具寿命长,材料利用率高,生产成本低等优良性能. 相似文献