共查询到16条相似文献,搜索用时 250 毫秒
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国内某1 780 mm热连轧机组因精轧机工作辊表面氧化膜剥落而严重影响带钢表面质量,导致每月约有1 500 t钢卷被判为废次品。从轧辊材质、轧辊冷却水、防剥落水、轧制润滑及切水板等方面分析了轧辊表面氧化膜剥落的原因,并通过优化轧辊冷却水、调整防剥落水喷射位置、消除集管间相互干扰、改造切水板配置等技改方案解决了热轧生产中轧辊表面氧化膜剥落的问题,因氧化膜剥落产生的热轧卷废次品减少了90%以上,企业降废增效成果显著。 相似文献
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针对热轧酸洗板表面的斑状色差缺陷, 从微观特征与生产关联性因素方面进行了研究。结果表明:斑状色差缺陷的产生与基体和氧化铁皮的界面状态密切相关, 酸洗后表面粗糙度的差异是导致色差缺陷产生的直接原因。生产关联性因素跟踪及分析发现: 色差缺陷的产生主要与热轧精轧工作辊辊面的状态密切相关, 轧辊氧化膜剥落导致的铁皮压入缺陷是导致带钢酸洗后出现斑状色差缺陷的主要原因。为此, 制定了合理的热轧工艺及轧辊使用和精轧用水、轧制润滑的优化等控制措施, 成功消除了热轧酸洗板表面的斑状色差缺陷。 相似文献
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Kyungzoon Min Kisoo Kim Sung Kyu Kim Doh-Jae Lee 《Metals and Materials International》2012,18(2):341-348
An oxide layer, which developed on the surface of a commercial hot rolling mill, was examined by forcibly stopping the roller
between mill stands during activity. Liquid quartz was sprayed on the strip to prevent further oxide layer growth during cooling
after stopping the hot-rolling mills. Then the thickness and shape of the oxide layer was examined in a cross-sectional view
using an optical microscope. The thickness of the oxide layer increased through the 1st and 2nd passes of hot rolling, and then decreased through successive rolling, because the thickening rate by growth is larger than
the thinning rate by deformation in high temperature. The temperature distributions of the oxide layer as well as the strip
were predicted using the thermo-mechanical finite element method. As thermal conductivity of the oxide layer is low, the temperature
deviation of the oxide layer increases and average temperature decreases as the thickness of the oxide layer increases, suggesting
the increased formation of surface defects. With these results, a new cooling device was installed between the hot rolling
mills to decrease the surface temperature and the thickness of the oxide layer, resulting in improved surface quality of the
strip. 相似文献
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针对采用抛丸毛化轧辊平整机平整后的马口铁基板上出现的批量色差亮线,分析了轧辊表面形貌及轧辊表面发生剥落的原因,提出除需保持机架内腔、工作辊和支撑辊表面洁净外,还需尽量减少抛丸次数,采用圆形或圆形与菱形混合丸料,可避免轧辊表面出现“层状翘起组织”,从而控制带钢表面的“亮线”缺陷。 相似文献