TransForm - Controlling the wrinkling of fibre-based materials through adaptive process control and camera-based data acquisition in transparent forming tools

TransForm - 通过透明成型工具中的自适应过程控制和基于摄像头的数据采集来控制纤维材料的起皱

• 批准号: 524957871
• 负责人: Professor Dr.-Ing. Peter Groche
• 金额: --
• 依托单位: Institut für Produktionstechnik und Umformmaschinen
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/524957871?language=en
• 关键词: TransForm; Controlling; wrinkling; fibre; based

Both legal framework conditions and a growing consumer need for sustainable packaging require a reduction in the share of plastic-based disposable packaging. An alternative to this is paper-fibre-based packaging. In order to be able to offer a high variety of shapes, three-dimensional forming processes such as deep-drawing are required. The low degree of forming that can be achieved and the defects that occur still pose challenges for a comprehensive substitution of plastic-based packaging with paper as a material. A particularly noticeable defect in deep-drawing paper is the formation of wrinkles in the flange. These basically occur due to tangential compressive stresses as a result of material displacement in the forming process, but their exact local and temporal formation and development are not yet sufficiently understood. This circumstance as well as the development of methods to locally influence the forming process are to be addressed within the scope of the proposed project. The key elements are a transparent die and image-based sensors for the in-situ detection of the material feed and the formation of wrinkles. On the basis of this optical process monitoring, insights into influencing factors on the local material flow can be gained with temporal resolution and a comparison with an analytical prediction of the wrinkle formation can be carried out. On this basis, locally adaptive process control is investigated. Locally adaptive process control is particularly promising for complex forming geometries and due to the strongly anisotropic material properties of the fibre material paper. For this purpose, a locally adaptive blank holder is being developed using additive manufacturing processes. By means of individually controllable elastic pressure pockets, the influence of a locally adapted control and regulation of the blankholder pressure on the wrinkle pattern can be investigated. The aim is thus to maximise the quality of the produced part.

法律的框架条件和消费者对可持续包装日益增长的需求都要求减少塑料一次性包装的份额。另一种选择是纸纤维包装。为了能够提供各种各样的形状，需要三维成形工艺，如深拉。可实现的低成型度和出现的缺陷仍然对以纸为材料的塑料基包装的全面替代构成挑战。深冲纸的一个特别明显的缺陷是在凸缘处形成皱纹。这些基本上是由于成形过程中材料位移产生的切向压应力而发生的，但其确切的局部和时间形成和发展尚未得到充分理解。这种情况以及局部影响成型过程的方法的开发将在拟议项目范围内解决。关键元件是透明模具和基于图像的传感器，用于原位检测材料进料和褶皱的形成。在此光学过程监测的基础上，可以获得对局部材料流的影响因素的洞察，具有时间分辨率，并且可以与褶皱形成的分析预测进行比较。在此基础上，研究了局部自适应过程控制。局部自适应过程控制对于复杂的成形几何形状特别有希望，并且由于纤维材料纸的强各向异性材料特性。为此，正在使用增材制造工艺开发局部自适应坯料保持器。通过可单独控制的弹性压力腔，可以研究压边力的局部适应性控制和调节对起皱图案的影响。因此，目标是最大限度地提高生产部件的质量。