共查询到20条相似文献,搜索用时 171 毫秒
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用传统方法进行张力减径机孔型设计时是以减径率为依据分配变形量。由于该方法没有充分考虑钢管壁厚的影响,致使成品管质量和乳机工作状态受到不利影响。作者阐述了一种沿机架分配钢管变形量的新方法——基于延伸率的分配方法,并给出了设计实例。采用这种设计方法后,钢管在各机架的变形量更加均匀,轧机工作状态也更为稳定。 相似文献
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通过多年生产实践,对张力减径机与挤压机配套使用的一般情况作了阐述,认为把热挤压管作为张力减径机的荒管进行减径和延伸的这一设想是合理的。文章结合四厂实际,对张力减径机与3150吨挤压机联合生产的合理性进行了分析。指出,热挤压法能够适应多品种、多规格、小批量的生产特点;而张力减径机则要求品种单一、大批量和大长度。因此,在现有生产条件下,硬把减径机和挤压机拉到一起,不但不能发挥减径机的应有作用,反而因互不适应而带来新问题,如因管端不可避免的增厚而增加切头切尾损失,减径机前应增设除鳞装置等。 相似文献
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方平 《金属材料与冶金工程》1994,(4)
介绍了微张力减径工艺中单机架减径率、孔型椭圆度、张力系数工艺参数的选定原则和选定范围,认为其最佳范围是单机架减径率3%~5%,宽度系数0.975~1.025,张力系数0.25~0.45。 相似文献
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方平 《金属材料与冶金工程》1994,(4):32-33
介绍了微张力减径工艺中单机架减径率、孔型椭圆度、张力系数工艺参数的选定原则和选定范围,认为其最佳范围是单机架减径率3%~5%,宽度系数0.975~1.025,张力系数0.25~0.45。 相似文献
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简要介绍张力减径机的发展演变,针对万利钢管有限公司引进的KOCKS公司张力减径机,着重分析了其结构、装配特点及工艺性能。 相似文献
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凌仲秋 《金属材料与冶金工程》2009,37(3):31-35
针对从西德引进的集体传动12架张力减径机未购买其工艺软件的问题,从工艺理论上建立了集体传动张力减径机的工艺计算方法,为新规格产品的开发找到了理论依据。 相似文献
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通过将6机架定径前45钢管外径和总减径率分别由132 mm和12.95%降至128 mm和9.87%,并降低单机架减径率和改善微张力减径孔型设计参数,使3辊式机组生产的Φ114 mm×22 mm 45钢管"内六方"缺陷指数P值由1.40%~1.52%降至0.45%~0.67%,明显减少微张力减径钢管的"内六方"缺陷. 相似文献
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提出了集中差速传动张力减径机钢管变形和电机转速的计算方法,通过轧卡实验和计算机速度的实际应用,证明计算方法可靠,实用。 相似文献
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New propositions are introduced into the technique of energy-force calculation of pinch-pass mills in order to determine the energy–force and technological parameters of skin rolling of cold-rolled steel strips at the minimum errors. The application of these propositions decreases the errors of calculating the forces and torques in a working stand by a factor of 3–5 as compared to the calculation according to the well-known technique, saves the electric power in the existing mills, and demonstrates the possibility of decreasing the dimensions of working stands and the power of the rolling mill engine. 相似文献
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The rolls in contemporary four-high mills cannot be maintained parallel during the rolling process. There- fore, four-high rolling mill vibrations take place in six degree of freedom (DOF) leading to spatial behaviors invol- ving vertical, horizontal, axial, torsional, cross and swinging vibration modes resulting in complex relative motions between the rolls. Two numerical methods, modified Riccati-transfer matrix method (Riccati-TMM) and finite ele- ment method (FEM), are presented to analyze a spatial vibration characteristic of two four-high rolling mills with different stability. The natural frequency and mode shape of four-high rolling mills are obtained, and the clearance has a great effect on natural frequency and mode shape. In addition, field testing experiment is also conducted to measure natural frequency by power spectrum analysis of rolling mill vibration. Experimental results basically agree with those calculated by Riccati-TMM and FEM, which means that the Riccati-TMM and the FEM can be used for analysis of spatial vibration of four-high rolling mill. Meanwhile, the spatial vibration shows more compound vibra- tion behaviors and the negative effect of horizontal, vertical, cross and swinging vibration modes are effectively con- trolled after redesign of rolling mill. These advantages have a great significance for the rolling mill to be operated with a much higher rolling speed and improved yield of products. 相似文献
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A universal method is proposed for studying the production of straight-seam electrowelded pipe on various mills, including bending mills. Algorithms are given for parameter selection with a specified mill design and parameters of the shaping mill. Examples of calculation by means of the mathematical model are presented. 相似文献
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