【摘要】 介绍了用短芯头过渡拉伸、再用与成品等长的长芯头进行成品拉伸的方法研制低温供热实验堆堆芯燃料元件盒所用的Zr-4合金薄壁大方管的过程,对称不等边的八边形截面方管尺度大,精度要求高,长边为138.7_-0.3^+0.2mm,壁厚只有1.5mm,用本文介绍的方法研制的管材达到了使用要求的精度,工艺重复性能也比较好。更多还原

【Abstract】 The asymmetrical octagon Zr-4 alloy tubes which are used for fuel assembly in the heating reactor have been developed. The thickness of tube wall is l.5mm and the length is 1725mm.The long side of the octagon is 138. 7?;Jmm, the short side is 93.1?.1mm. To manufacture these tubes a stretch draw forming processing method is adopted. The process is divided into two phases. In the first phase, a short draw mould is used to stretch the Zr-4 alloy tube, In the second phase, by using a long draw mould, its length is equal to the end-produt length, completes the final processing. The size accuracy and repeatability of this method are excellent and fully meet the design requirements.更多还原