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      2. 轧管



      3.定减径 (包括张减)

      大圆变小圆,简称定径;相应的设备为定(减)径机。对定减径工艺的要求是:首先在一定的总减径率和较小的单机架减径率条件下来达到定径目的,第二可实现使用-●种规格管坯生产多种规格成品管的任务,第三还可进一- 步改善钢管的外表面质量。20世纪80年代末,曾出现过试图取消轧管工序,仅使用穿孔加定减的方法生产无缝钢管,简称CPS,即斜轧穿孔和张减的英文缩写),并在南非的Tosa厂进行了工业试验,用来生产外径:3 3.4~1 7 9.8mm, 壁厚3.4~25mm的钢管,其中定径*小外径为101 .6mm; 张减*大外径我101 .6mm。经过实践检验,该工艺在产生壁厚大于10mm的钢管时质量尚可,但在生产壁厚小于8mm的钢管时通过定径、张减不能完全消除穿孔毛管的螺旋线,影响了钢管的外观质量。在随后的改造中不得不在穿孔机于定减径机之间增设了一台MINI-MPM(4机架)来确保产品质量。


    赣州被钩公司 商洛畔假工艺品有限责任公司

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