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首页> 外文会议>ASME(American Society of Mechanical Engineers) International Mechanical Engineering Congress: Proceedings of the ASME Manufacturing Engineering Division; 20031115-20031121; Washington,DC; US >SENSITIVITY ANALYSIS OF HYDRO-RIM DEEP DRAWING OF CYLINDRICAL CUPS
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SENSITIVITY ANALYSIS OF HYDRO-RIM DEEP DRAWING OF CYLINDRICAL CUPS

机译：圆柱状水-深拉深的敏感性分析

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Extensive nonlinear finite element analyses were conducted to help predict practical test conditions of intelligent hydro-rim deep forming of cylindrical cups under controlled cooled punch and heated blank temperatures, punch speed, chamber and rim pressures, and punch friction. The study focused on finding practical process conditions for maximizing the drawing ratio by variations in blank and punch temperatures, friction, rim pressure, chamber pressure, and punch speed. The study was based on an experimental cell that aimed at using real time control of the mentioned parameters to delay the necking process. The finite element material model considered the plastic behavior to be strain rate and temperature dependent. While conventional deep drawing is limited to a Limit Drawing Ratio (LDR) of about 2, the results show that a LDR of 4 is achievable by careful control of the various parameters listed above. Blank temperature, punch friction, rim pressure, and chamber pressure provide significant influence of various degrees on increasing the cup drawing ratio. Blank heating is very effective, but does not by itself guarantee higher LDR. The presence of punch friction coupled with chamber pressure tends to delay the necking and moves the latter up along the cup wall and away from the cup bottom corner. Rim pressure, while difficult to implement, results in significant improvement of the LDR, since it helps push the material into the die, and in doing so reduces the cup-wall tension that causes the material instability. High rim pressure, on the other hand, increases the blank thickness resulting in increased blank holder loads. Punch temperature does not play as critical a role as the blank temperature in maintaining a high LDR under the conditions investigated. The study revealed that punch speed had to be above a certain critical level for a LDR of 4. However, increased punch speed proved to cause higher variations in the thickness along cup wall. It is important to mention that the results of this study do not necessarily apply to all metals; copper material was used here. Metals with low ductility, for example would react differently, a subject of future studies.
机译：进行了广泛的非线性有限元分析，以帮助预测在受控的冷却冲头和加热的坯料温度，冲头速度，腔室和轮辋压力以及冲头摩擦力的作用下，圆柱杯的智能水缘深成形的实际测试条件。这项研究的重点是通过改变毛坯和冲头温度，摩擦力，轮辋压力，腔室压力和冲头速度来找到最大拉深比的实际工艺条件。该研究基于一个实验单元，该单元旨在使用上述参数的实时控制来延迟缩颈过程。有限元材料模型认为塑性行为与应变率和温度有关。虽然常规的深冲被限制为大约2的极限拉伸比（LDR），但结果表明，通过仔细控制上面列出的各种参数，LDR可以达到4。坯料温度，冲头摩擦力，轮辋压力和腔室压力对提高杯子拉伸比有不同程度的重大影响。空白加热非常有效，但不能单独保证更高的LDR。冲头摩擦力与腔室压力的结合会延迟颈缩，并使颈缩沿杯壁向上移动并远离杯底角。轮辋压力虽然难以实施，但却可以显着改善LDR，因为它有助于将材料推入模具中，并因此降低了导致材料不稳定的杯壁张力。另一方面，较高的轮辋压力会增加毛坯厚度，从而导致毛坯支架负载增加。在所研究的条件下，打孔温度对保持高LDR的作用不如空白温度重要。研究表明，对于LDR为4的情况，打孔速度必须高于某个临界水平。但是，事实证明，增加的打孔速度会导致杯壁厚度发生较大变化。值得一提的是，这项研究的结果不一定适用于所有金属。这里使用铜材料。例如，延展性低的金属会产生不同的反应，这是未来研究的主题。

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