共查询到19条相似文献,搜索用时 343 毫秒
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楔横轧楔入段端面移动量规律 总被引:1,自引:0,他引:1
楔横轧多楔轧制是内楔和外楔同时对轧件进行径向压下、轴向延伸的塑性成形.随着交通运输业的飞速发展,火车轴、汽车半轴等长轴类零件的需求量与日俱增,采用楔横轧多楔工艺成形长轴类零件,具有显著节省辊面、减小设备体积、生产效率高、节材、降低成本等优点.为了充分发挥多楔显著节省辊面的优点,保持内外楔同时起楔,就必须要准确弄清楔入段移动量的变化规律.采用弹塑性有限形变有限元数值方法,根据实际工况模拟楔横轧轧制过程,分析楔入段移动量的变化规律,详细阐述各工艺参数对移动量的影响规律,并与试验测试结果进行比较,得到楔入段端面移动量的变化和影响规律.研究结果为楔横轧多楔同步轧制模具设计提供了重要的理论依据,进一步完善了楔横轧多楔轧制理论. 相似文献
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楔横轧轧件滚动半径变化规律的试验研究 总被引:5,自引:2,他引:3
楔横轧轧制成形过程中轧件的滚动半径是楔横轧模具设计和进行工艺分析的基本参数之一,它反映了轧辊与轧件的相对运动关系,对非圆截面轴类零件如发动机凸轮轴等模具辊形曲线设计具有重要影响.通过轧制试验,得到楔横轧轧制过程中轧件滚动半径的变化规律和各种工艺参数的影响规律.结果表明:楔入段轧件滚动半径要大于原始坯料尺寸且随着轧制进行逐渐减小;到展宽段保持稳定;进入轧齐后,随着模具楔面抬高,其值逐渐减小,精整段约等于轧件轧后尺寸.展宽角和成形角越大,轧件滚动半径越大;断面收缩率影响规律比较复杂,当断面收缩率小于一定值时,随断面收缩率增大而增大,当断面收缩率大于一定值时,随断面收缩率增大而减小;坯料直径表现为辊径比越大,轧件滚动半径越靠近原始坯料尺寸内侧;轧制温度对轧件滚动半径的影响较小,而模具楔面刻痕状态影响较大. 相似文献
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借助刚塑性有限元软件DEFORM-3D针对4Cr9Si2马氏体耐热钢楔横轧成形过程进行有限元数值模拟,得到楔横轧工艺参数——楔尖圆角对楔横轧4Cr9Si2马氏体耐热钢轧件对称中心的心部缺陷以及轧件表面的表面螺旋痕和对称中心横截面拉细的影响规律:随着楔尖圆角的增大,轧件表面径向力的数值得到减小,从而使横楔轧轧件表面螺旋痕将会明显减小;当楔尖圆角增大后,轧件心部横向应力σy和切应力τxy的持续时间将增加,同时,楔横轧轧件心部第一主应力σ1的方向将会发生改变,使轧件心部金属朝横向y方向流动,从而增加了楔横轧轧件心部缺陷产生的可能性;楔尖圆角增大,轧件轴向力Fz的数值将会减少,从而能够改善对称中心横截面拉细状况。进行4Cr9Si2马氏体钢的楔横轧轧制试验,验证有限元模拟结果的可靠性,并通过增大展宽角获得合格的轧件。 相似文献
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Zbigniew Pater Janusz Tomczak Tomasz Bulzak 《The International Journal of Advanced Manufacturing Technology》2018,94(9-12):3075-3083
The paper discusses the problems of forming parts such as stepped shafts by cross wedge rolling (CWR). In industrial practice, this rolling process is performed at stages, i.e., in several passes, when large cross-sectional reductions are involved. The same can also be done using a different design of this forming process, namely, multi-wedge cross rolling (MWCR), in which the workpiece is simultaneously formed by several pairs of tools (wedges). This paper compares the above two methods with respect to forming a drive shaft. Wedge tools used in both forming processes are described, and the numerical results of the simulations performed to verify the adopted solutions are reported. The results demonstrate that the MWCR method offers more advantages than the classical CWR technique. Consequently, MWCR is then verified in experimental tests. The experimental results confirm that parts such as stepped shafts can be formed by the MWCR method. 相似文献
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黎汉昌 《机械设计与制造工程》2013,(12):69-72
为应对目前市场上长轴加工仍然以锻造和楔横单扎为主的加工方式的缺点,基于遗传算法优化,建立了多楔耦合关系,通过多楔控制,使多楔之间的转速、力矩、压力等因素形成协同关系,满足加工精度需要。通过遗传算法优化多楔内楔入段、外楔入段、多楔展宽段、内楔精整段以及外楔精整段五个阶段的控制,避免建立复杂模型从而提高了效率节约了成本。试验结果表明,楔横轧多楔同步技术克服了锻造和楔横单扎加工方式的不足,能够很好地解决长轴加工精度控制和成本问题。 相似文献
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多楔楔横轧轧制力在线测试系统 总被引:1,自引:0,他引:1
针对目前多楔轧制规律比较复杂现状,设计了H630轧机轧制力在线测试系统,该系统可以在线准确测出单楔与多楔轧制过程中轧制力变化规律。同时采用Ansys/Ls—Dyna3D有限元软件对轴类零件楔横轧制过程进行模拟,并对轧制力变化规律进行较系统的分析,分析结果与实验测试结果基本一致。 相似文献
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Shaft part rolling is an efficient and green nearnet shaping technology offering many advantages, including high production efficiency, high material utilization rate, high product quality, and excellent production environment. In this paper, the features of shaft part rolling are introduced along with the working principles of two main shaft part rolling technologies, namely, cross wedge rolling (CWR) and skew rolling (SR). In relation to this technology, some R&D achievements gained by the University of Science and Technology Beijing are summarized. Finally, the latest developments in shaft part rolling are presented, including SR steel balls, precise forming of camshaft blank by CWR, SR phosphorous copper balls at room temperature, and CWR hollow axle sleeve. Although the shaft part rolling technology has been widely used in China, it only accounts for about 15% of applicable parts at present. Nevertheless, this technology has broad application prospects. 相似文献
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Da-Wei Zhang Sheng-Dun Zhao 《The International Journal of Advanced Manufacturing Technology》2014,70(5-8):1455-1462
The research and implementation work for a new shaft part rolling process have been carried out in the present study, where the shaft has a thread and a small module spline or gear. This method is developed based on two-roll cross rolling technologies for thread and spline, and two round rolling dies provide special structure for synchronously forming thread and spline (or gear). In one rolling process, the threaded and splined (or geared) shapes on the different portions of shaft part are formed synchronously, and then the manufacturing cycle has been shortened and the relative phase between thread and spline (or gear) in mass production can be keep stable. Virtualizing practice of the new forming process for a shaft part with thread and spline was carried out by mean of FEM numerical simulation. The results indicated that the shapes of thread and spline being formed in one rolling process would be achieved by controlling the synchronous rolling process combining reasonable design for die structure. 相似文献
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采用DEFORM有限元软件建立了楔横轧汽车油泵轴的三维刚塑性有限元模型,分析了闭式展宽角、闭式成形角、开式展宽角和开式成形角等模具参数对汽车油泵轴力能参数的影响规律,发现:闭式展宽角的增大会使得各力能参数变化速率加快;闭式成形角的增大会使得各力能参数随之增大;开式展宽角的增大会使得径向力增大;开式成形角的增大会使得轴向力增大。进行了1∶1闭开联合轧制汽车油泵轴实验,实测轧制力矩相对误差在10%以内,验证了有限元模型的正确性。 相似文献
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