楔横轧多楔轧制铁路车轴可行性有限元分析

采用DEFORM有限元软件，建立楔横轧多楔轧制铁路RD2车轴有限元模型，进行多楔轧制过程有限元仿真，通过分析三楔同时楔入成形RD2轴的金属流动规律、轧件内部应力状态情况等，进一步阐明楔横轧多楔轧制铁路车轴的可行性。有限元分析结果为实现铁路车轴高效化、节能化、专业化生产提供了理论依据。     

汽车半轴楔横轧机辊系动态特性分析

应用ANSYS有限元动力学分析模块,求出汽车半轴楔横轧机辊系在现有边界条件下的固有频率和振型,分析辊系在不同中心距和不同约束下固有频率和振型的变化规律,研究结果为进一步优化该轧机设计,提高汽车半轴精度,实现汽车半轴高效化生产提供了理论基础.     

楔横轧轧制力矩规律有限元分析与实验测试

采用二次开发的有限元命令流程序，较系统地分析了轧制过程中轧制力矩的变化规律，阐明各工艺参数对轧制力矩的影响规律；利用计算机数据采集测试系统，在线测试展宽角对轧制力矩影响规律，测试结果与理论分析结果一致。研究结果为大型楔横轧机研制中力能参数的确定提供了重要的理论依据。     

二轴产品的楔横轧成形工艺

介绍了一种汽车齿轮箱传动轴楔横轧锻造成形工艺,该工艺提高了生产效率,改善了工作环境,减少了机加工刀具损耗,提高了锻件使用性能,锻造工艺稳定、可靠。     

楔横轧多楔轧制光轴表面光滑程度规律研究

楔横轧多楔成形光轴类零件时,内外楔之间轧件的过渡段形状为由外楔楔入段轧制而成的斜台阶,通过有限元模拟和轧制实验,对不同过渡角下多楔轧制光轴表面光滑程度进行分析,得到过渡角对楔横轧多楔轧制光轴表面光滑程度影响规律。研究结果为楔横轧多楔精密成形长轴类零件提供了理论指导。     

楔横轧变形过程中内部空心缺陷产生机理的模拟研究

利用Deform-3D软件对楔横轧变形过程进行了三维有限元模拟仿真,得到了三维变形状态下轧件内部应力、应变场的全部信息和材料的流动形态,揭示了在整个变形过程中轧件内部应力应变状态及其历史演化过程,进而对楔横轧内部空心缺陷产生的机理做出了明确的阐述。     

楔横轧在汽车等轴类零件上的应用与发展

一、楔横轧技术简况1.楔横轧技术的简要历程20世纪50年代,由原捷克国发明了楔横轧轴类零件成形工艺并首先应用于汽车、五金工具等零件的生产,其技术与设备出口英国、美国等国家,成为国际上公认的轴类零件成形新技术,由于技术复杂等原因,至今只为少数国家全面掌握。     

楔横轧二次楔轧制大断面收缩率的应力应变场分析

利用有限元软件DEFORM-3D,基于三雏刚塑性的有限元理论,对大断面收缩率轴类零件成形过程成功地进行了楔横轧二次楔轧制成形的数值模拟,模拟所得的轧件形状与实际零件基本相同,给出了楔横轧二次楔轧制过程的应力应变分布等重要信息。模拟结果表明：二次楔轧制大断面收缩率轴类零件的心部发生了很大变形;二次楔轧制中间横截面受的横拉应力时间较长、值较大,所以轧件中心更容易产生内部缺陷。     

汽车覆盖件成形的有限元模拟及模具设计

介绍了在有限元模拟基础上进行的汽车覆盖件模具设计,利用专用软件AutoForm对某车型的B柱进行了冲压方向的确定、拉深筋的布置、压料面和工艺补充面的设计以及拉深成形过程的数值模拟.根据模拟结果调整优化了工艺参数和毛坯形状等,消除了零件成形中的质量缺陷,提高了成形工艺稳定性,对实际生产中B柱成形的工艺确定和模具设计提供了依据.     

The establishment of a failure criterion in cross wedge rolling

Internal defects in the cross wedge rolling (CWR) process can lead to the catastrophic failure of products. Using specialised experiments and the explicit dynamic finite element model (FEM), this work investigates the mechanisms of void generation and growth in the cross wedge rolling process. Based on a combined numerical and experimental approach, the morphology of void generation is determined as a function of the workpiece material and three primary parameters in the cross wedge rolling process: the forming angle, , the stretching angle, and the area reduction, _A . Through the definition of a non-dimensional deformation coefficient, , a method for predicting the likelihood of void formation is subsequently ascertained and discussed with respect to CWR tooling design and operating conditions.     

齿轮轴楔横轧齿形成形质量影响因素研究

应用楔横轧技术生产齿轮轴不仅生产效率高,材料浪费率低而且成形的齿轮轴具有更高的强度.应用Deform软件对齿轮轴楔横轧成形过程中轧件温度、齿数、模数、模具运动速度和分度圆直径对齿形质量的影响进行研究;得出了各因素的重要性影响大小的顺序和各个因素对齿形成形质量的影响规律.     

楔横轧加工铝合金内部损伤的研究

目前优质钢的楔横轧加工方面的研究已经成熟,但铝合金的楔横轧研究很少。使用韧性破坏准则对楔横轧铝合金的内部损伤进行了研究,得到了各个工艺参数对轧件内部损伤的影响规律:最大损伤量随加工温度的升高而下降;随轧辊转速的升高而升高;随模具的展宽角、成形角、断面收缩率的增大而减小。结论对实际生产具有一定的指导意义。     

Analysis of stress in cross wedge rolling with application to failure

In the present investigation, a previously developed three-dimensional finite-element model for the cross-wedge rolling (CWR) process has been used to characterize the workpiece material stress and deformation behavior. Particular attention has been paid to the center and mid-radius points of the billet where internal defects (i.e. internal cracks and porous voids) often occur. Several failure criteria in the solid mechanics theory are summarized. The effect of three important CWR parameters, namely the forming angle, the area reduction, and the friction coefficient, on the field variables has been investigated, including the first principal stresses, maximum shear stresses, etc. A total of 14 rolling conditions are analyzed for the billet material aluminum alloy 1100. After initially verifying the numerical results, several tendencies for the CWR process, as related to failure, are ascertained and discussed.     

Analysis of the bending of the rolling material in asymmetrical sheet rolling

In asymmetric rolling the workpiece is often bent to an unexpected shape. Its curvature may be caused by a speed difference, by a lubrication mismatch or a radius difference of the work rolls, and depends on various rolling parameters, such as the ratio of the peripheral velocities of the upper roll and the lower roll, reduction ratio, average radius of the work rolls, initial plate thickness and friction between the rolls and the workpiece. A finite element simulation, which shows the influence of different diameters of the working rolls and of the degree of reduction on the bending of the workpiece, has been performed.     

Theoretical method for estimation of mean pressure on contact area between rolling tools and workpiece in cross wedge rolling processes

The paper gives a new method no determine the mean unit contact pressures on a material—tool contact surface in cross wedge rolling processes (CWR). The dependencies worked out on the basis of the energy and the upper bound methods permits rolling forces to be determined which are comparable to experimentally measured ones. The analysis provides equations which relate the mean contact pressure q_m to the basic process parameters, namely the forming angle α, the spreading angle β, the relative reduction of a portion δ and the shear friction factors m and m_k.     

带辅助环的楔块式超越离合器工作机理及楔紧和退楔条件的研究

带辅助环楔块式超越离合器不仅克服了常用超越离合器承械能力低、工作稳定性较差的缺陷,而且满足了大功率、高效率机械产品开发的需要.通过对其工作机理和工作过程的分析和描述,得到了其楔紧和退楔的条件,经仿真分析表明,该超越离会器具有结构简单、响应灵敏,承载能力强、稳定性高等特点.     

Optimum design of roll forming process of slide rail using design of experiments

In the design of the roll forming process, design errors can be determined in advance by using an FE simulation tool such as SHAPE-RF. In the case of a product such as a slide rail having a complicated shape and requiring high-precision forming, a standard is necessary for quantitatively evaluating the quality of the formed shape. In the analysis of the roll forming process of a slide rail, the pass having the largest deformation is designated as the target pass and the positions and shapes of the rolls are set as design variables. A minimum number of simulations was performed by using the table of orthogonal arrays. A cost function was obtained from the results by using the design of experiments such as the response surface method and it was minimized for satisfying the design constraints. By improving the design of the target pass, the shape of the final product approaches that intended by the designer.     

铜管行星轧制过程金属流动规律的研究

采用有限元软件MSC.MARC的三维网格重划分功能对铜管行星轧制从咬入到稳定轧制的全过程进行了有限元仿真分析,对轧制过程中金属的流动规律进行了研究。结果表明:管坯在轧制过程中发生了两次扭转;运用目前的设备,无法实现轧件在轧制过程中完全不转动,只能调试电机转速使轧件出口不转动。