In this paper, a novel method for bending micro-tubes at room temperature has been developed. For this purpose, a bending apparatus has been designed and manufactured to bend micro-tubes under micro-wire mandrel, then, the effect of the new bending method at bending ratios of 1–3.2 and bending angles of 45° to 135° in that apparatus has been investigated. The bending of the micro-tube without mandrel and also by using a micro-wire mandrel has been evaluated and analyzed in order to compare and show the efficiency of the proposed method. For the bending process, micro-tubes of AISI 304 L with a diameter of 1250 μm have been selected. In bending operations, several parameters such as thickening, thinning, and cross-section distortion has been simultaneously investigated at different bending ratios (R/D) and different bending angles. The results of this study illustrate that the micro-tube which is bent with a bending ratio of 1, has been remained without wrinkling and rupture and the micro-wire mandrel, significantly reduces defects at critical bending ratios, it also reduces cross-section distortion by half at the bending ratios of 2 and above.

在本文中，已开发出一种在室温下弯曲微管的新方法。为此目的，已经设计并制造了一种弯曲设备，用于在微丝芯轴下弯曲微管，然后，新的弯曲方法在弯曲比为1–3.2且弯曲角度为45°至135°时产生效果仪器已被调查。为了比较和显示所提出的方法的效率，已经评估和分析了没有心轴的微管的弯曲以及还通过使用微丝心轴的弯曲。对于弯曲过程，已选择直径为1250μm的AISI 304 L微型管。在弯曲操作中，已经在不同的弯曲比（R / D）和不同的弯曲角度下同时研究了诸如增厚，变薄和横截面变形等几个参数。