Comparative analyses off the deep drawing process with extended process kinematics

拉深工艺与扩展工艺运动学的比较分析

• 批准号: 276018745
• 负责人: Professor Dr.-Ing. Dirk Landgrebe
• 金额: --
• 依托单位: Professur für Werkzeugmaschinenkonstruktion und Umformtechnik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/276018745?language=en
• 关键词: Comparative; analyses; off; deep; drawing

Necking and wrinkling are the main cases of failure in deep drawing processes. Different approaches have been tested so far to effectively exploit the deformability of the material. The development of high dynamic servo press technology enables the implementation of new technologies with active changes in loading during variable path of the press ram and die cushion. The well-known technology of the pulsating die cushion extends the forming limits. A more recent approach is the simultaneous pulsation of the die cushion and ram which is designated as a cushion-ram-pulsation. In preliminary investigations some effects could be shown which lead to a further extension of the forming limits. The knowledge of the stress conditions in the contact area and the forecast of the process parameters are insufficient for the cushion-ram-pulsation. Today an appropriate basis of evaluation is still lacking. For example, if the amplitudes of the load changes are in the same order as backlash and as elasticity in the whole system of tool and machine, these quality-determining factors must be taken into account in the process setup by superimposed vibrations. In the proposed project, a method for evaluating single-force-terms shall be used to allow a direct comparison between the standard deep drawing, the cushion pulsation and the new cushion-ram-pulsation and to clarify the observed phenomena of processes with variable kinematics.

颈缩和起皱是拉深过程中的主要失效形式。到目前为止，已经测试了不同的方法来有效地利用材料的可变形性。随着高动态伺服压力机技术的发展，在压力机滑枕和模具缓冲器的可变路径过程中，能够实现主动改变载荷的新技术。众所周知的脉动模具缓冲技术扩展了成形极限。最近的一种方法是同时脉动的模具垫和公羊，这是指定为一个双头公羊脉动。在初步研究中，可以显示出一些影响，这些影响导致成形极限的进一步扩展。在接触区域的应力条件的知识和工艺参数的预测是不够的，活塞-活塞-脉动。今天仍然缺乏适当的评价基础。例如，如果负载变化的幅度与整个工具和机器系统中的间隙和弹性处于相同的量级，则必须通过叠加振动在过程设置中考虑这些质量决定因素。在拟定项目中，应使用一种评估单力项的方法，以便在标准深冲、缓冲脉动和新的活塞-柱塞-脉动之间进行直接比较，并澄清观察到的具有可变运动学的过程现象。