A modular tooling set-up for incremental sheet forming (ISF) with subsequent stress-relief annealing under partial constraints
A modular tooling set-up for incremental sheet forming (ISF) with subsequent stress-relief annealing under partial constraints
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DOI：
10.1063/1.5008090
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发表时间：
2017-10
期刊：
影响因子：
--
通讯作者：
F. Maqbool;M. Bambach
中科院分区：
文献类型：
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作者：
F. Maqbool;M. Bambach
渐进板料成形(ISF)是一种最适合小批量生产板材零件的制造工艺。在ISF中，数控刀具按照指定的轮廓在板材上移动，以形成所需几何图形的一部分。这项研究集中在与ISF相关的主要工艺限制之一，即有限的几何精度。在这一点上，进行了一个案例研究，表明可以提高成形零件的几何精度，通过在开夹前使用应力消除退火法。为了保持较低的模具成本，设计了一种由硬质金属框架和由廉价塑料(Sika®)制成的插件组成的模块化模具设计。成型后，塑料嵌件被移除。在应力消除退火期，金属框架支撑零件。对制造过程进行了有限元(FE)模拟。由于成形过程中产生的残余应力，通过有限元模拟和有限元分析，确定了成形零件的几何形状。
Incremental sheet forming (ISF) is a manufacturing process most suitable for small-batch production of sheet metal parts. In ISF, a CNC-controlled tool moves over the sheet metal, following a specified contour to form a part of the desired geometry. This study focuses on one of the dominant process limitations associated with the ISF, i.e., the limited geometrical accuracy. In this regard, a case study is performed which shows that increased geometrical accuracy of the formed part can be achieved by a using stress-relief annealing before unclamping. To keep the tooling costs low, a modular die design consisting of a stiff metal frame and inserts made from inexpensive plastics (Sika®) were devised. After forming, the plastics inserts are removed. The metal frame supports the part during stress-relief annealing. Finite Element (FE) simulations of the manufacturing process are performed. Due to the residual stresses induced during the forming, the geometry of the formed part, from FE simulation and the actua...