Influence of Surface Topographical Interaction between Tool and Material in Micro-Deep Drawing
Influence of Surface Topographical Interaction between Tool and Material in Micro-Deep Drawing
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DOI：
10.1299/jmmp.3.397
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
Tetsuhide Shimizu;Yushiro Murashige;K. Ito;K. Manabe
中科院分区：
文献类型：
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作者：
Tetsuhide Shimizu;Yushiro Murashige;K. Ito;K. Manabe
在板料成形尺寸的小型化过程中，模具和坯料的表面粗糙度与外形尺寸的相对比值比传统的宏观工艺的情况下变得更大。这意味着表面粗糙度可能会影响摩擦行为，从而也会影响产品的加工特性和精度。在本报告中，使用微工具和具有不同表面条件的不锈钢箔进行微拉深以生产直径为700μm、厚度为20μm的杯状物。为了评价表面性质对微成形性和微成形精度的影响，对微杯形件的冲压力、表面精度和厚度应变分布进行了实验研究。此外，使用有限元（FE）模型，考虑表面粗糙度，表面粗糙度对成形性的影响进行了分析，在不同的工具和材料的表面条件。结果表明，微成形中的整体成形行为比宏观成形中的整体成形行为更强烈地受到摩擦接触行为的影响，摩擦接触行为是由表面粗糙度的差异引起的。此外，它示出了这种局部摩擦学行为的主导因素是取决于正常负载条件的工具/材料表面粗糙度的相互作用。
In the miniaturization of dimensions for sheet metal forming, the relative ratio of the surface asperities of tools and blanks to the outside dimensions becomes larger than that in the case of the conventional macroscale process. This means that the surface asperities may affect frictional behavior, so that it would also affect processing characteristics and accuracy of products. In this report, micro-deep drawing for producing cups of 700μm diameter and 20μm thickness is conducted using microtools and stainless steel foils with different surface conditions. To evaluate the effects of surface properties on micro-formability and micro-forming accuracy, punch force, surface accuracy, and the thickness strain distribution of microcups are experimentally investigated. Additionally, using a finite element (FE) model that considers surface roughness, the effect of surface roughness on formability is analyzed under different tool and material surface conditions. Results show that the global forming behavior in microforming is subjected much more intensely to tribological contact behavior, which is caused by the difference of surface asperities, than that in the case of the macroscale region. Moreover, it is shown that predominant factor over this local tribological behavior is the interaction of both tool/material surface asperities that depends on the normal load condition.