共查询到18条相似文献,搜索用时 218 毫秒
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摆辗机摆头运动学分析和运动轨迹的数值模拟 总被引:2,自引:0,他引:2
从摆动辗压机中摆头的结构出发,通过运动学分析给出摆头运动方程,采用数值方法对摆头运动轨迹进行数值模拟,为摆辗机结构设计和摆辗工艺的合理应用提供了科学依据。 相似文献
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为防止直齿圆锥齿轮摆辗下模齿根断裂、齿顶磨损等缺陷,在摆动辗压成形基础上,建立三维有限元模型,对不同摆头倾角和进给速度下成形直齿圆锥齿轮进行了有限元模拟与分析,通过对摆辗下模轮齿上的特定点进行受力分析,探讨了不同摆头倾角和进给速度对直齿圆锥齿轮振动摆辗成形过程中摆辗下模应力的影响,并对这两个参数进行正交模拟试验。数值模拟结果表明,当进给速度v=5 mm·s~(-1)、上模摆头倾角γ=2°时,摆辗下模轮齿的受力更均匀,摆辗下模的疲劳磨损更小,使用寿命高。 相似文献
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介绍了摆动辗压技术的工艺原理及成形过程,阐述了摆辗工艺的国内外研究发展情况和应用现状,指出摆辗成形工艺产品种类,并提出摆动辗压技术未来的发展趋势。 相似文献
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由于摆动辗压工艺比其它塑性成形工艺更为复杂,其工艺设计的难度和工作量也较大.摆动辗压成形工艺CAD的研制主要是提高摆辗工艺的设计效率和精度.以节油器内花键套为对象,建立了预制坯的体积计算模型及其结构设计模型,确立了摆动模的设计模型和凹模的力学分析模型,给出了摆辗工艺参数和力能参数的设计模型.在此基础上对摆辗成形工艺CAD系统进行了结构分析和功能分析,实现了预制坯、摆辗模具和摆辗参数的计算机辅助设计,设计效率可以提高60%以上,废品率降低25%以上,并结合实例得到了满意的设计结果. 相似文献
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汽车半轴摆动辗压制坯工艺数值模拟 总被引:1,自引:1,他引:0
介绍了一火摆动辗压的工作原理和优越性。在摆辗机上预锻制坯是一火摆动辗压成形的关键。通过力学计算和有限元分析,选出最佳摆角γ为3°。数值模拟结果可以为开发该工艺设备确定主参数提供理论依据。 相似文献
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Xinghui Han Lin Hua Wuhao ZhuangXinchang Zhang 《Journal of Materials Processing Technology》2014,214(11):2402-2416
This paper is aimed to investigate the process design and control method in cold rotary forging of parts with non-rotary upper and lower profiles. Using the analytical and FE simulation methods, three critical technological problems in the cold rotary forging process of this kind of parts are resolved reasonably. The first one is that an accurate design method of the non-rotary upper die is presented based on the geometrical and kinematic relationship between the upper die and upper profile of parts. The second one is that the interference judgment between the upper die and upper profile of parts can be achieved by analytically obtaining the trajectory of any point in the upper die. The third one is that the metal flow and geometrical accuracy of the non-rotary upper profile of parts can be effectively controlled through optimizing the process parameters. On the basis of the above research, the cold rotary forging process of a typical gear part, both the upper and lower profiles of which are non-rotary, is investigated numerically and experimentally. The results indicate that the desirable geometrical accuracy of the non-rotary upper profile of the gear part can be obtained, which verifies that the process design and control method presented in this paper is valid and cold rotary forging can thus be used to manufacture the parts with non-rotary upper and lower profiles. 相似文献
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H. Tian J. Wang W.P. Dong J. Chen Z. Zhao G.M. Wu 《金属学报(英文版)》2005,18(5):627-634
Traditionally a rotary forging process is a kind of metal forming method where a conic upper die, whose axis is deviated an angle from the axis of machine, forges a billet continuously and partially to finish the whole deformation. For the rotary forging process simulation, more researches were focused on simulating the simple stage forming process with axisymmetric part geometry. Whereas in this paper, the upper die is not cone-shaped, and the billet is non-axisymmetric. So the movement of the punch is much more complicated than ever. The 3D FEM simulation models for the preforming & final forming processes are set up aider carefully studying the complicated movement pattern. Deform-3D is used to simulate the material flow, and the boundary nodal resisting forces calculated by the final stage process simulation is used to analyze the final forming die strength. The CAE analysis of the die shows that the design of the final forming die is not reasonable with lower pre-stress which is easy to crack at the critical corners. An optimum die design is also provided with higher pre-stress, and verified by CAE analysis. 相似文献
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本文简述了摆辗变形的特征及其力学分析,同时给出了摆辗变形过程中经常产生的四种缺陷:薄件中心开裂;大头件侧表面开裂;高件失稳折迭及锻不透等缺陷。指出,由于摆辗工艺的特殊性。上模与工件始终有一个接触小区,压力高,且模具在热辗时受热疲劳作用,中心常产生龟裂、塌陷等缺陷。文中最后给出了防止产生缺陷的措施和提高模具寿命的方法。对于厚件和大头带杆件应适当控制每转进给量;对于薄件要适当加大进给量或采用局部加厚的办法;冷辗大头件要注意原始坯料表面质量、控制好模具间隙均可以减少裂缝、失稳折迭等缺陷的产生。 相似文献
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螺旋锥齿轮摆辗成形凹模通常采用电火花加工,用于电火花加工的电极对于模具型腔的制造精度具有重要影响.对螺旋锥齿轮与工具电极尺寸传递规律进行研究,并在此基础上设计凹模工具电极.最后对设计的电极齿形进行加工和检测,为齿轮摆辗成形凹模电极设计制造提供了科学依据. 相似文献
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摆辗镦挤成形的上限分析 总被引:2,自引:0,他引:2
本文应用上限法对圆柱体自由摆辗镦挤成形过程的力能参数和变形规律进行了分析研究,变形区域由接触变形区、非接触变形区和塑性铰组成,并建立了相应的动可容速度场。通过优化计算,获得了摆辗镦挤变形力、反挤压高度随着坯件高度压下量、摆头每转压下量、坯件与模具接触面上的摩擦的变化而变化的关系。 相似文献
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G.Liu S. J. Yuan Z. R. Wang T. Xie ) Harbin Institute of Technology Harbin China ) Harbin Huasheng Coorpration Harbin China 《金属学报(英文版)》2000,13(2):470-475
1.~onRotaryforginghasadVantagessuchassmallloading,highaccrryofworkpiece,lowernoiseandvibration,etc.Inmanycases,the~diedepressesspirallyandcontinuouSlyonapartofworkpiece,finallythewholempdefonnationisobtained.ItisespeciallysuitableforfoeingvariousaxisyITUnetricalParts['].SOfar,thetheoreticalanalysisisnotenoughbecausethemotionOfthedieandtheflowstateofmaterialsaresocomplex.Therefore,theprocessdesigndifficultyisincreasedandsomedefectssuchascenter--thewhngandcrackinginadiscworkpieceOftenoccurdu… 相似文献
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本文采用三维刚塑性有限元法对圆盘件的摆动辗压过程进行了数值模拟,针对具体算例进行了圆盘件摆辗中心变薄缺陷的预测,并且对所提出的缺陷防止办法进行了数值模拟,结果说明,采用有限元方法进行圆盘件摆动辗压工艺缺陷预报是可行的,所提出的工艺优化方案改善了工件的受力条件,避免了工件中心变薄的发生。 相似文献