Influences of process and material parameters on quality of small-sized thin sheet-metal parts drawn with multipoint tooling
Influences of process and material parameters on quality of small-sized thin sheet-metal parts drawn with multipoint tooling
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DOI：
10.1016/j.promfg.2018.07.395
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发表时间：
2018-08
期刊：
影响因子：
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通讯作者：
Song Yang;Michael McPhillimy;Taufik Bin Mohamed Supri;Y. Qin
中科院分区：
文献类型：
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作者：
Song Yang;Michael McPhillimy;Taufik Bin Mohamed Supri;Y. Qin
多点工装成形是一种特殊的板料成形技术，它沿机床滑块方向(通常是垂直方向)使用两组可调销，代表了所需成形刀面轮廓的作用点，具有很好的操作灵活性。然而，在不同的工艺和机器设定的条件下，成形过程中可能会产生一些缺陷，如起皱和不需要的表面压痕。本文以小尺寸零件为研究对象，研究了薄板拉深成帽状零件时，调整工装可能引起的工艺变化的影响，以及相应的质量控制。研究了成形曲率、板材和几何形状、压紧力、润滑条件和橡胶垫对成形零件几何形状和表面质量的影响。成形零件用三坐标测量机测量，并用高分辨率相机在压痕上观察。结果表明，在采用多点模具成形生产之前，需要对特定类型的材料和几何形状的薄板成形的工艺参数和机器设置进行仔细的控制，而橡胶垫的使用和压边机的合理设计对于成功地用离散销工具成形薄、小尺寸的金属板件是至关重要的。
Multi-point tooling forming is one of the special categories of sheet metal forming techniques with good operational flexibilities due to using two sets of adjustable pins along the machine ram direction (vertical direction usually), which represent the acting points of desired forming-tool surface contours. Nevertheless, some defects may develop during forming under different process and machine-set conditions, such as wrinkles and undesired surface indents. This paper presents a study of the influences of possible process variations by adjusting the tooling as well as associated quality control when thin sheet-metals were drawn into the cap-type parts, being focused on the small-sized components. Effects of the curvatures to be formed, sheet material and geometry, holding force, lubrication condition and use of rubber as cushions on the formed component-geometry and surface quality have been investigated. The formed parts were measured with a Co-ordinate Measuring Machine and observed on the indentation with a high resolution Camera. The results showed that careful control of the process parameters and machine setup for the forming of thin sheet-metals for a particular type of the material and geometry is needed prior to the forming production uses with multi-point tooling forming, and use of rubber cushions and proper design of blank-holding are extremely important for successfully forming thin, small sized sheet-metal components with discrete pin-tools.