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在螺旋焊管生产过程中,带钢纵向边缘预弯对预防和控制焊管成型缝产生"桃形尖"缺欠非常重要。介绍了一种辊式预弯边装置的孔型设计方法,给出了带钢弯曲成型时的边部翘曲曲率的计算公式,建立了带钢边部在辊式预弯边装置中的预弯曲率(指中性层)1/ρ预的数学模型,为二辊式预弯边装置的预弯辊辊型设计和三辊式预弯边装置的预弯调整指明了方向,对改善螺旋焊管成型缝质量和实际生产都具有一定的指导意义。 相似文献
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ERW焊管辊弯成型过程的动态仿真研究 总被引:1,自引:0,他引:1
ERW焊管辊弯成型过程复杂,规律难以把握。为了获得高质量的ERW焊管,减少成型缺陷,降低开发成本,文章采用动力显式有限元法和实验获得材料模型,建立ERW焊管辊弯成型过程的弹塑性有限元模型,实现了对ERW焊管连续成型过程的全流程仿真,分析了带钢在成型过程中的应力、应变变化规律与形状变化规律以及带钢厚度对成型质量的影响。研究结果表明,整个辊弯成型过程应力变化较为平缓,在精成型段有较大变形量,产生较大应力;边部纤维纵向应变高于中部纤维,导致边部有少量"皱曲"产生;随着厚度的增加,纵向应变相应增大。 相似文献
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详细阐述螺旋缝埋弧焊管成型工艺参数的确定,分析1~3号成型辊位置调整的原因及调整的依据及计算方法,并将计算值与实际测量值进行比较。分析认为:螺旋缝埋弧焊管成型工艺参数调整的计算方法合理,理论计算值与实际测量值相差不大,计算准确,能在实际生产中应用。 相似文献
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国内外直缝焊管机组的发展趋势 总被引:5,自引:0,他引:5
探讨了国内外直缝焊管机组的发展趋势。重点讨论了辊式成型与排辊成型两种成型方式的特点.分析了国内引进的10余套ERW直缝电阻焊管机组的生产情况及工艺设备问题。指出除高(中)频热处理、超声波探伤、剪切对焊及排辊成型等设备可以引进外,飞切机、水平螺旋活套、水压机和平头倒棱机等都可以实现国产化。 相似文献
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分析了螺旋缝焊管成型过程中造成1~3号成型辊使用寿命最短的原因——与润滑不良关系极为密切.针对这一原因,提出增加一套带控制回路的集中润滑系统对成型辊进行定时、定量润滑,是提高其使用寿命的关键.此套集中润滑系统不需人工操作,全程自动控制,能实现自动定时开启、定量加油.采取该措施后,1~3号成型辊的使用寿命提高了1倍以上. 相似文献
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《Journal of Materials Processing Technology》2014,214(9):1820-1827
Continuous roll forming (CRF) is an effective process to manufacture swept surface parts of sheet metal. The forming tool in CRF is a pair of small-diameter bendable forming rolls, a swept surface is formed continuously after the rotating rolls sweep out the whole sheet metal blank. The two bent rolls and the non-uniformly distributed roll gap along the rolls’ length make the sheet metal bent in longitudinal and transverse directions simultaneously, the cross-section curve of the formed swept surface is controlled by the curved profile of the forming rolls and the spine curve is controlled by the differential elongations of sheet metal generated by roll gap. In this paper, a necessary condition for the formation of a swept surface is proposed and analyzed, the parametric equations of the formed surface in CRF are derived and the method to determine the roll gap for forming a given swept surface is presented. The numerical simulations and analyses on the CRF processes demonstrate the validity of the presented theoretical models. The experimental and measured results show that the formed surfaces are in good agreement with the desired surfaces, and swept surface parts with good forming precision can be obtained by CRF process. 相似文献
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排辊成形是利用若干组小排辊将带钢续弯卷成管筒的一种辊式成形工艺,是制造焊管的重要加工技术。现代的排辊成形工艺设计涉及到CAD,CAE和知识管理等多个方面的技术,技术平台的集成至关重要。本文以Visual Basic为开发平台,利用Visual Basic与ACCESS数据库、MATLAB与ANSYS的接口技术,将参数设计、有限元模拟和知识管理集成,开发了直缝焊管排辊成形工艺设计系统。通过该系统可以实现直缝焊管排辊成形过程的工艺参数管理、机组的轧辊设计、花型设计、工艺参数设计以及CAD/CAE建模仿真。该平台可以为工程人员进行直缝焊管工艺设计提供重要参考。 相似文献
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Y. Saito T. Watanabe H. Utsunomiya 《Journal of Materials Engineering and Performance》1992,1(6):789-795
A new type of compact continuous mill called the “Satellite mill” has been developed to produce profiled metal strip from
flat strip. This mill consists of one large-diameter driven roll (central roll) and five smaller rolls (satellite rolls) arranged
along the periphery of the central roll. A strip is continuously rolled at five gaps between the central roll and the satellite
rolls. All rolls are driven at an equal roll peripheral speed to promote transverse metal flow or lateral spread. Guide shoes
are provided between the adjacent satellite rolls and are supported with two adjacent satellite rolls. They prevent a strip
from bulging or buckling. A test mill was constructed, and rolling experiments have been performed on the production of T-shaped
or U-shaped profiled aluminum strip. The deformation- load characteristics were investigated and compared with those of conventional
rolling. As a result, in the satellite mill rolling operation, elongation was suppressed. Lateral spread was enhanced, and
the profile of the product cross section was significantly improved. Consequently, the new rolling process was found to be
forming of profiled metal strip. 相似文献
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介绍了一种新型六辊矫直机的设计方法。该方法改进了矫直机上下矫直辊结构,加长了矫直辊辊身长度,增加了钢管与矫直辊在单位长度上形成的包络范围,同时增加了新型边侧辊装置。通过上述改进设计,解决了大直径薄壁钢管在传统六辊矫直机矫直过程中容易产生的钢管跑偏、矫直变椭圆、钢管断面畸变等质量缺陷问题,显著提高了钢管的矫直精度和成品质量。 相似文献
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An assessment of finite element software for application to the roll-forming process 总被引:5,自引:0,他引:5
The roll forming industry has many difficulties in product development and process set-up. The design and development of rolls and processes are mainly based on trial-and-error and past experiences. Recent industrial trends demand products having high quality and tight tolerances. This requires more precise and cost-effective roll-forming processes than the ones employed in the traditional product development methods.
SHAPE is a reliable FE based solution provider, which covers a wide range of roll forming and rotary forming simulations including ring rolling, tube spinning, flow forming, and thread rolling. It also provides powerful analysis tools for heat transfer, roll stress and microstructure analyses. In this chapter the technical capability of SHAPE for roll forming is assessed by studying an industrial problem. The accuracy and robustness of the software is evaluated using machine shop results. 相似文献
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冷弯成形工艺参数的设计对冷弯成形产品质量有重要影响。本文对方矩形管冷弯成形过程中机架间距、摩擦因数和轧制速度的不同取值水平通过正交试验设计,利用Abaqus有限元软件的显式非线性动态分析对所设计试验仿真模拟,得到了每道次轧制过程中带钢边部最大纵向应变最小时各个道次3个工艺参数的最佳取值。并用优化后的参数进行仿真和验证,得到各道次带钢边部最大纵向应变比优化前要小,优化后第4~第10道次带钢纵向应变极值相对接近,产品边部拉伸小,并且边部拉伸分布比较均匀,有效改善了产品质量。 相似文献
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焊管轧辊材料的发展趋势及几点建议 总被引:3,自引:0,他引:3
简介了锻坯或轧坯焊管轧辊、铸钢或铸铁焊管轧辊用材的发展趋势。从焊管轧辊的综合效益考虑,建议逐渐开发和使用铸钢或铸铁焊管轧辊;同时应加强对焊管轧辊使用的维护和废焊管轧辊的合理回收。 相似文献
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以Φ114mm焊管机组的孔型设计、机械传动原理为基础,对轧辊修复进行了理论分析和计算。采用该方法修磨的轧辊,上下辊之间和各道次之间的速比均保持不变,可保证机组的正常运行和提高轧辊的重复使用率。 相似文献