Fabrication of noncircular multicore microtubes by superplastic dieless drawing process
Fabrication of noncircular multicore microtubes by superplastic dieless drawing process
复制标题
DOI：
10.1016/j.jmatprotec.2013.07.005
复制
发表时间：
2014
影响因子：
6.3
通讯作者：
T. Furushima;A. Shirasaki;K. Manabe
中科院分区：
文献类型：
--
作者：
T. Furushima;A. Shirasaki;K. Manabe
一种不需要模具或工具的超塑性无模拉拔方法被应用于Zn-22 Al超塑性合金的拉拔，该合金用于非圆形微管，例如具有方形内横截面和矩形外横截面的方形、矩形和非圆形多芯管。在本研究中，探讨了加热条件，如加热长度和使用或不使用冷却装置，对变形行为的影响。结果表明，经3道次超塑无模拉伸后，可制备出边长为0.58mm的方形微管和边长为0.75mm × 1.3mm的矩形微管。此外，还通过实验研究了异形管与方、矩形管组合件在无模拉伸过程中的基本变形行为。根据相似定律，在加热长度较宽的情况下，与加热长度较窄的情况相比，超塑性无模拉伸工艺后的非圆形管的横截面形状趋于保持。在此基础上，采用4道次超塑性无模拉伸工艺，成功制备出了内径为335 μm的方管和外径为533 μm × 923 μm的矩形管的非圆微管。结果表明，超塑性无模拉伸是制备非圆多芯微管的有效方法。
A superplastic dieless drawing process that requires no dies or tools is applied to the drawing of a Zn–22Al superplastic alloy for noncircular microtubes such as square, rectangular and noncircular multi core tubes having square inner and rectangular outer cross-sections. In this study, the effects of heating condition, such as heating length and the use or nonuse of cooling device, on deformation behavior are investigated. As a result, a square microtube with 0.58 mm side and a rectangular microtube of 0.75 mm × 1.3 mm were fabricated after 3-pass superplastic dieless drawing. In addition, the fundamental deformation behavior of noncircular tubes combined with square and rectangular tubes during the dieless drawing process has been clarified experimentally. The cross-sectional shape of the noncircular tubes after the superplastic dieless drawing process tends to be maintained on the basis of the similarity law in case of a wide heating length compared with a narrow heating length. Furthermore, a noncircular microtube, which has inner square tubes with a 335 μm side, and an outer rectangular tube of 533 μm × 923 μm were fabricated successfully after a 4-pass superplastic dieless drawing process. Consequently, it was found that the superplastic dieless drawing is effective for the fabrication of noncircular multicore microtubes.