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轧环机工作参数理论设计 总被引:5,自引:0,他引:5
分析了环件轧制的力学规律的运动学性性质,研究和建立了环件轧制的咬入条件、锻透条件、轧制力与力矩关系、直线运动与旋转运动关系,在此基础上,确定了轧环机主要工作参数的理论设计方法和计算公式,为轧环设计制造提供了依据。 相似文献
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借鉴手动操作辗环机轧制环件的经验,分析辗环机轧制过程中环件的咬入条件、锻透条件、刚性条件与每转进给量的关系,以此确定关于每转进给量的理论设计方法和计算公式,为环件轧制的自动控制设计提供理论参考。 相似文献
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矩形截面铝合金环件轧制成形方法 总被引:2,自引:1,他引:1
在试验和生产实践基础上,提出了一种采用空气锤自由锻制坯、轻向轧环机轧制成形矩形截面铝合金环件的新方法,通过设计轧制用毛坯、轧制孔型、轧制工艺参数,成功实现了矩形截面铝合金环件轧制成形和批量生产。 相似文献
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针对异形截面环件在实际轧制过程中影响因素较多、规律复杂、环件质量较难保证等问题,结合径向轧环轧制特点,提出径向封闭轧制成形工艺。以异形截面盾构机滚刀刀圈体为研究对象,借助立式轧环机、1000 t压机等设备,从工艺方案制定、轧制工艺参数选择、坯料形状设计、模具结构设计、轧制孔型安装调试等方面对轧环质量的影响进行了分析。结果表明:当轧制比为1.2~4.0、环件毛坯与锻件体积近似相等、环坯各截面圆滑渐变、毛坯内孔上下端面设置倒角,并且于轧制前将导向轮尽可能靠近环件、轧制后驱动辊多轧制几圈予以修型,可以消除环件的毛刺缺陷,提高了环件的综合力学性能、缩短生产周期、降低生产成本。 相似文献
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辗环机主要用于加工高质量无缝环件,具有许多优良的工艺特性。本文在简要叙述轧环理论、轧环工艺的基础上,分析了环件轧制质量的影响因素和轧环技术发展趋势。 相似文献
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Ring gripping means that under the pressure of roll and friction, ring grips the rolling gap and produces rotating rolling motion, thus ring thickness receives equal rolling and the outer diameter expands equally, and this is a sufficient condition for ring rolling forming. In this paper, gripping course in profile ring rolling of raceway groove is analyzed based on ring rolling principle and static theory. The gripping mechanical model for profile ring rolling of raceway groove is established, and gripping conditions are researched according to the geometrical relationship in rolling. The results indicate that ring could be ensured to continuously grip the gap in rolling by controlling feed per revolution and preventing it from exceeding the maximum feed per revolution allowed by ring gripping. Furthermore, influencing factors of gripping conditions are analyzed. At last, the experiments and the FE simulation for profile ring rolling of raceway groove are performed to testify the validity of gripping conditions. Both the experimental and simulation results show that when feed satisfies gripping conditions, ring can continuously grip the gap and be formed by rolling. Otherwise, ring cannot grip the gap and is squashed between the rolls. The results of this research provide a theoretical basis for design of technological parameters of profile ring rolling of raceway groove. 相似文献
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台阶截面环件轧制成形原理和工艺设计 总被引:5,自引:0,他引:5
本文研究了台阶截面环件轧制中轴向体积流动和壁厚拉缩规律 ,阐明了其轧制成形原理和工艺设计原理 ,建立了相应的工艺设计方法 ,并用于轧制生产工艺设计 相似文献
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VIBRATION AND CONTROL IN RING ROLLING PROCESS 总被引:7,自引:0,他引:7
Hua Lin Mei Xuesong Wu Xutang School of Materials Science Engineering Wuhan Automotive Polytechnic University Wuhan P. R. China School of Mechanical Engineering Xian Jiaotong University Xian P. R. China 《中国有色金属学会会刊》1999,9(2)
1INTRODUCTIONRingrolingisanimportantmechanicalprocesingproceswhichissuitableforproducingd50~100mmringpartsofdiferentmateria... 相似文献
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阶梯孔环件轧制体积流动和毛坯设计 总被引:3,自引:0,他引:3
本文分析了阶梯孔环件轧制变形特点和尺寸变化规律;证明了阶梯孔环件轧制中存在轴向体积流动,导出了体积流动量的计算式,并指出了实现体积流动的进给条件。基于阶梯孔环件轧制体积流动规律,提出了阶梯孔环件轧制用毛坯设计原理和方法,并进行了轧制实验验证。 相似文献
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The radial–axial ring rolling technology is used mainly to manufacture large rings in many industrial fields. During rolling process the ring may be collapsed or deformed unexpectedly under the pressure of guide roll, and in this case the ring is wasted. To prevent ring collapsing is necessary for smooth rolling. On the basis of rolling theory, the forces exerted to ring in radial–axial ring rolling process were analyzed, and the stiffness model of ring was proposed. The stiffness condition was derived and the influencing factors of ring stiffness condition were explained. The ring stiffness condition in radial–axial ring rolling is related to the factors of ring size, rolling ratio, position angel of guide roll, rolls sizes, position of cones, radial and axial feed speed and friction condition. The effect laws of some factors on ring stiffness condition were revealed by FEM simulation. The stiffness condition can be used as a rule of design and manufacturing for radial–axial ring rolling. 相似文献
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M. S. Joun J. H. Chung R. Shivpuri 《International Journal of Machine Tools and Manufacture》1998,38(10-11)
In this paper, a new method for approximately predicting the deformation of material in ring rolling is presented. The plastic flow of material in ring rolling is assumed to be axisymmetric and thus the ring rolling process is considered as a sequence of consecutive forging processes. The problem, having tool velocity as well as material velocity field as unknown variables, is formulated by an axisymmetric rigid–viscoplastic finite element method. The unknown tool velocity is determined by making the circumferential stress on the ring cross-section exist in the range of user-specified values. The approach is applied to preform shape design in ring rolling of bearing races. The predicted results are compared with the experimental ones. It has been shown that the approximate approach presented is useful for engineering design of preform in ring rolling of bearing race-like rings. 相似文献
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环件轧制过程三维动态数值模拟 总被引:1,自引:0,他引:1
由于环件轧制受到静力学、运动学和动力学因素的影响,使得控制环件成形具有高度的复杂性,采用传统的试凑法很难满足产品研发的需要。本文基于通用动力显式有限元软Ansys/LS dyna建立了RAW200/160-5型径轴向轧环机的三维仿真模型,对某矩形截面环件进行了虚拟轧制,结果显示了环件扩展和缺陷生成的动态过程以及应力、应变和位移云图。仿真结果表明,采用计算机模拟环件轧制生产过程,对于优化毛坯形状,制定或修改环件轧制工艺,缩减产品研发时间,降低生产成本,提高轧制效率具有重要的意义。 相似文献