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近年来,用户对φ108mm 以上大口径高精密度薄壁无缝钢管的需求量越来越大。为此,成都无缝钢管厂利用 LG200冷轧管机和 LB100冷拔管机进行了大口径薄壁管的试制工作。在试制过程中,钢管因横向和纵向壁厚不均缺陷而报废数量较大。例如有一次生产一批140×2.1(20~*)薄壁产品共33支(123.75M),检查合格15支(56.25M),合格率仅有45.45%。产品报废18支(67.5M),其中壁厚超差13支(48.35M)占废品总数的72.2%,其余缺陷仅占废品总数的27.8%。为解决这一问
In recent years, users of φ108mm above the demand for large-diameter high-precision thin-walled seamless steel pipe more and more. To this end, Chengdu seamless steel pipe plant using cold rolling machine LG200 and LB100 cold drawing machine for large-diameter thin-walled tube trial work. During the trial production process, the pipe was scrapped in large quantities due to the unevenness of the horizontal and vertical wall thickness. For example, once a batch of 140 × 2.1 (20 ~ *) thin-walled products was produced in a total of 33 pieces (123.75M) and 15 pieces (56.25M pieces) were inspected, with a pass rate of only 45.45%. The products were scrapped 18 (67.5M), of which 13 (48.35M) of wall thickness accounted for 72.2% of the total number of wastes, the remaining defects accounted for only 27.8% of the total number of wastes. To solve this question