A New Process Design for Performing Hole-flanging Operations by Incremental Sheet Forming
A New Process Design for Performing Hole-flanging Operations by Incremental Sheet Forming
复制标题
渐进式板材成形翻孔新工艺设计
DOI：
10.1016/j.proeng.2014.10.325
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Voswinckel
中科院分区：
文献类型：
--
作者：
Bambach;Voswinckel
孔法兰是许多钣金零件中的重要功能元件。它们提供刚度，允许定位和固定，引导电缆等。钣金零件中的孔翻边操作通常使用专用工具进行。最近的出版物证明，通过增量板材成形进行孔翻边（即增量孔翻边）是使用专用工具的传统操作的有趣替代方案。在增量孔翻边中，观察到的极限扩孔比高达 4，远大于 2 左右的典型扩孔比。此外，增量板成形工艺保持了高度灵活性，即可以使用通用 CNC 驱动成形工具来成形法兰，无需专用工具。然而，加工时间和几何精度方面的缺陷仍然限制了工业应用。本文研究了增量孔翻边的工艺限制，并提出了两种旨在减少电流赤字的新方法。第一个是自适应压边圈，它在成形工具附近起作用，并减少不必要的二次变形，二次变形会导致偏离目标几何形状。第二个是一种新的工艺设置，可以高速执行增量孔翻边操作。使用这些方法，可以充分利用渐进成形的灵活性及其在高成形性方面的优势，同时可以最大限度地减少几何误差和加工时间长等典型缺点。
Hole flanges are important functional elements in many sheet metal parts. They provide stiffness, allow for positioning and fixation, they guide cables etc. Hole flanging operations in sheet metal parts are typically performed using dedicated tooling. Recent publications proved that hole flanging by incremental sheet forming (i.e. incremental hole flanging) is an interesting alternative to the traditional operations with dedicated tools. In incremental hole flanging, limit hole expansion ratios of up to 4 were observed which are much larger than the typical expansion ratios of around 2. In addition, the high flexibility of the incremental sheet forming process is maintained, i.e. flanges can be formed using a universal CNC-driven forming tool without dedicated tooling. However, deficits in terms of process time and geometric accuracy still limit the industrial application. This paper investigates the process limits of incremental hole flanging and proposes two new approaches aiming to reduce current deficits. The first one is an adaptive blank holder that acts in the vicinity of the forming tool and reduces unwanted secondary deformation that would lead to deviations from the target geometry. The second one is a new process set-up that makes it possible to perform incremental hole flanging operations at high speed. Using these approaches, the flexibility of incremental forming and its advantages regarding high formability can be exploited, while the typical disadvantages such as geometric inaccuracies and long process times can be minimized.
扩展轴环成型工艺的工艺限制
DOI：
--
发表时间：
2008
期刊：
影响因子：
--
作者：
M. Otto
通讯作者：
M. Otto
DOI：
10.4028/www.scientific.net/kem.549.45
发表时间：
2013-04
期刊：
Key Engineering Materials
影响因子：
--
作者：
H. Voswinckel;M. Bambach;G. Hirt
通讯作者：
H. Voswinckel;M. Bambach;G. Hirt