小弯曲半径薄壁纯锆U形管弯制模具的研制

Development of Bending Die for Thin-walled Pure Zirconium U Shape Tubes with Small Bending Radius

薄壁纯锆U形管在弯制过程中容易产生椭圆度、回弹、划伤以及弯管内弧褶皱等现象,为了实现小弯曲半径薄壁锆管的弯制成形,根据U形管的弯制特点,并结合实际弯制经验,设计并制作了U形管的弯制模具。该弯制模具主要采用绕管方式进行弯制,U形管一端固定,另一端进行弯制。弯制试验结果表明,该弯制模具能够制作弯曲半径为50 mm和105 mm的φ25.4 mm×1.24 mm薄壁锆U形管,弯制后的U形管成形状态良好,检测结果均能满足GB 151—1999标准及设备生产工艺的要求,并能有效地保证弯管质量。

Abstract： It is easy to ellipse, rebound, scratch and internal fold during the bending process of thin walled pure zirconium U shape tube. In order to bend of thin-walled pure zirconium tube with small bending radius, the bending die of U shape pipe is designed according to the characteristics and experience of U shape tube bending. The bending die was functioned in the way of winding, the end of the U shape tube was fixed and the other end was used to bend. The results of bending test show that the die can bend φ25.4 mm× 1.24 mm thin walled pure zirconium U shape tubes with bending radius of 50 mm and 105 ram. The U shape tubes have good forming condition, and test results can meet the requirements of GB 151-1999 standard and production process of equipment, and also can ensure the quality of tube effectively.