摆辗机新型椭圆运动轨迹的研究

具有双偏心套的摆辗机摆头运动轨迹较为复杂,本文针对直线运动轨迹中的摆头在交变成形力的作用下会导致摆头轴断裂问题,根据摆头运动原理,建立摆头运动方程,提出并分析了摆头新型椭圆运动轨迹,改善了摆头受力状况;并总结椭圆运动轨迹变化规律,为改进摆头结构、设计新型摆辗机、拓展摆辗成形工艺提供理论指导。     

摆辗机螺旋线和多叶玫瑰线的三维成形轨迹仿真

具有双偏心套结构的摆辗机摆头可以实现多种运动轨迹,螺旋线和多叶玫瑰线运动轨迹形状较为复杂,为了直观显示及分析摆头螺旋线和多叶玫瑰线运动轨迹的摆辗成形过程,根据摆头运动原理,建立摆头运动方程;应用MATLAB软件,针对摆头螺旋线和多叶玫瑰线运动轨迹进行仿真模拟,分析摆头三维运动轨迹的形成及规律。研究结果可直观显示摆头螺旋线和多叶玫瑰线运动轨迹成形过程,对于运动轨迹成形过程中摆角大小、摆头受力、摆辗机运动轨迹参数的选用和成形工艺制定均具有现实指导意义。     

摆辗机新型螺旋线运动轨迹研究

针对双偏心套摆辗机摆头的螺旋线运动轨迹,根据摆头运动原理,建立摆头运动方程,提出并分析摆头新型螺旋线运动轨迹的形成,总结该运动轨迹变化规律,为改进摆头结构、设计新型摆辗机、拓展摆辗成形工艺提供理论指导。     

摆辗机摆头4种运动轨迹的模拟与分析

针对国外摆辗机摆头4种运动轨迹的运动原理,推导摆头运动方程,用UG NX三维设计软件建立驱动摆头运动的内、外偏心套结构模型,对摆头运动仿真模拟,理论分析摆头4种运动曲线,验证仿真模拟结果。     

摆辗机摆头运动学分析和运动轨迹的数值模拟

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。     

波兰PXWP—100C型摆辗机摆头运动轨迹设计的数学依据

本文推出了摆头四种运动轨迹的简易表达式,解释了摆辗机的调整曲线,并简要介绍了四种运动轨迹的用途。     

基于MATLAB的摆辗机摆头圆和直线成形轨迹仿真与分析

具有双偏心套结构的摆辗机摆头可以实现多种运动轨迹,其中圆和直线运动轨迹应用较多。为了直观显示及分析运动轨迹的摆辗成形过程,根据摆头运动原理,建立摆头运动方程,应用MATLAB软件,针对摆辗机摆头圆和直线运动轨迹,叠加坯料向上送进油缸的运动,进行摆头三维运动轨迹的仿真模拟及规律分析。摆头在圆运动轨迹运动时,摆辗成形过程曲线为螺旋线,摆头摆角不为0且固定,摆辗成形过程是连续的局部成形。摆头在直线运动轨迹下,摆辗成形过程曲线为之字形曲线,摆角大小变化频繁,当运动曲线通过中心点时,摆头摆角为0,工件成形由局部变为整体成形,所需成形力增大。     

BY630型摆辗机摆头的有限元分析

摆头是摆辗机的关键零件之一，对ＢＹ６３０型摆辗机的摆头建立了有限元分析模型，用ＵＧ有限元分析软件对其进行了分析计算，得出了有益的结果。     

摆辗运动轨迹及调整曲线的分析研究

推导了摆辗机摆头的运动轨迹方程，分析了内外偏心套转速比μ与四种轨迹的关系，并给出了摆辗机的两条调整曲线以及计算多叶玫瑰线轨迹叶数和螺旋线轨迹圈数的方法。     

630kN薄板多点成形压力机研究

重点介绍 63 0 k N多点成形压力机的性能参数、工作原理、成形方法及特点。与传统的整体模具板料成形相比 ,它可以实现三维薄板类件既经济又快速的柔性成形     

A servo motor driven multi-action press for sheet metal forming

The goal of the current study is to adapt a servo-motor driven multi-action press for forming of sheet metal parts under precise velocity control and variable blankholding force. The Engineering Research Center for Net Shape Manufacturing [ERC/NSM] has developed a computer controlled multi-action press with two independently driven punches for research in cold forming of complex parts, using physical modeling techniques. Recently, the same press was modified and upgraded for use in sheet metal forming. As a result of its special design and construction, this press is highly controllable and can perform a wide range of sheet metal forming processes. Tests were conducted in order to obtain the actual press characteristics. Axisymmetric deep drawing experiments were performed with 1100-O annealed aluminum material using all three actions of the press. In these preliminary experiments, the crucial role of blankholding force control on final product quality and drawability was established.     

厚波纹板自动成形折弯机设计

在较厚板料加工成波纹板生产中,因加工工件重,无法通过人工移动板料完成折弯加工。由此设计了具有液压自动送料、自动升降的液压板料折弯机,只需一次上料就可完成波纹板加工生产。     

薄板成形液压机压边系统的程序控制

介绍了一种可编程的液压拉深压边设计。以程序调控四角压边缸的输出压力,使塑性金属板料进行合理流变,从而赋予液压机实现拉深成形工艺的随动调控。     

基于伺服压力机的板料成形研究现状与发展趋势

伺服压力机作为新一代的成形设备在板料成形领域正日益发挥重要作用。本文介绍了伺服压力机的技术特点,并面向冲裁、弯曲、拉深等典型板料成形工艺综述了伺服压力机在降低生产成本、优化工艺和提高产品质量方面的研究进展。此外,针对伺服压力机可设置保压及滑块运动精确可控的优点,综述了其在高强钢热冲压等复杂热成形过程中的应用。最后,对伺服压力机在板料锻造成形工艺上的应用与发展进行了展望。     

Elastic-plastic constitutive model for accurate springback prediction in hot press sheet forming

The present study investigates the effect of phase transformation plasticity on the springback of hot press formed parts. Employing an implicit finite element formulation to take phase transformations during rapid cooling from fully austenitic phase and their related thermo-mechanical behavior into account, two validations ?? (1) the loaded dilatometry problem which induces significant plastic deformation even at lower stress levels than the classical yield stress, and (2) the 2-D draw bending problem, which introduces high temperature forming and subsequent quenching ?? are presented and compared with known experimental data. The study showed that the magnitude of springback predicted by considering the phase transformation plasticity and the temperature change induced volumetric strain agreed well with date from experiments, while the results determined with the conventional elastic-plasticity theory in which only plastic deformation by external load was used, had considerable deviation for the springback profile after hot press forming. The negligible springback amount after hot press forming, which has been frequently reported in many experimental observations, is due to the stress relaxation by the addition of abnormal transformation plasticity.     

薄板成形过程中变压边力的优化技术研究

介绍了国内外薄板成形过程中压边力3优化技术的主要研究方法，并讨论了研究过程所存在的主要问题和研究的发展方向。