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。
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 mm.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 .
参考文献
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