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在轧制角钢过程中,成品辊发生断裂的现象时有发生。一般情况下,轧辊断裂都发生在凹轧槽,而凸轧槽很少断裂。角钢成品辊的断裂与其孔型形状和受力特点有关。本文从上述两方面对轧制角钢的成品辊发生断裂进行分析,并给出断裂判据。 1 角钢成品辊的断裂形式角钢成品辊的材质为球墨铸铁,属脆性材料。轧辊在辊身部位断裂几乎都发生在凹轧槽的最底部,即轧槽的尖角处。而且在轧制过程中,突然发生断裂,轧辊的断口较为平齐。通过对某轧钢厂φ250轧机轧制3~#角钢的成品辊断裂后的观察,可见在轧辊断裂的横断面最边缘一周有一宽 相似文献
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涟钢2 250热轧板厂是国内设计制造的常规热轧生产线,只配置了一架粗轧机,粗轧工作辊相对于其他配置两架粗轧机的热轧线磨损要大。生产线为了降低辊耗和减少粗轧换辊次数,增加粗轧工作辊过钢量,运行一段时间后发现轧辊事故增多和精轧前机架出现明显中浪。通过对粗轧工作辊过钢量、磨损量和消耗量等数据进行处理和分析,摸索出三者之间的数学关系,根据其对粗轧工作辊过钢量进行规范后,轧辊事故同比减少了58.28%,精轧前机架出现浪形的现象明显减少,成功解决了粗轧工作辊消耗与产品质量、轧辊安全使用之间的矛盾。 相似文献
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针对万能轧机UF精轧机重轨轧辊辊环利用率低的情况,对轧机轧制工艺参数进行可行性分析,通过采取增大轧辊辊环直径的措施,提高了轧辊辊环的利用率。 相似文献
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3.2 轧辊性能要求 粗轧机架工作辊3.2.1 由于粗轧机架轧辊承受着较高的轧制力和扭矩要求轧辊具有较高的机械强度同时轧材对其传,,热率高要求其具有良好的耐热疲劳性。粗轧段轧,制相对速度较低,对工作辊耐磨性要求不高,但粗轧后段即~架工作辊对耐磨性相对较高。R34 精轧段3.2.2 精轧段轧制条件变化较大,要求精轧前段和精轧后段工作辊具有不同性能。精轧前段承受较高 的轧制力和较后段高的轧材传热率,同时轧制相对速度亦较高,因而要求精轧前段工作辊具有较高的强度、耐磨性、抗热裂性。精轧后段轧制速度较高,轧辊承受着较高的单位面… 相似文献
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热轧轧辊是工业生产的重要机械设备,对于提高轧件质量和生产效率有着不可替代的重要作用,特别是通过各类手段可以有效降低轧辊辊耗,在热轧薄板的生产过程中,由于轧辊和钢坯直接接触,轧辊的消耗非常大,因此积极采取有效措施,最大程度的降低热轧轧辊辊耗,延长轧辊使用寿命.介绍了1750热轧薄板厂在轧辊管理使用与维护方面的一些心得,着... 相似文献
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通过对影响轧辊有载缝形状因素的分析,指出热轧中宽带精轧机组辊型制度制订的基本方法,为承钢热带厂投产后的精轧机组辊型制度的确定提供了一定的参考。 相似文献
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TB Birmingham JF Kramer JT Inglis CA Mooney LJ Murray PJ Fowler S Kirkley 《Canadian Metallurgical Quarterly》1998,26(4):562-566
The primary objective of the present study was to compare the effect of a neoprene sleeve on knee joint position sense during a sitting open kinetic chain test and a supine closed kinetic chain test. Young (24 +/- 2 years old), healthy subjects (18 men and 18 women) performed knee joint angle replication tests during open kinetic chain knee extension (sitting) and closed kinetic chain leg press (supine with an axial load of 15% body weight) before and after application of a neoprene sleeve over the dominant knee. The improvement in ability to replicate joint angles after application of the sleeve (sleeve effect) was significantly less during the supine closed kinetic chain test (0.3 degree +/- 1.4 degrees) than during the sitting open kinetic chain test (1.2 degrees +/- 1.1 degrees). The sleeve effect was inversely related to subjects' performance without the sleeve during both the sitting open kinetic chain and supine closed kinetic chain tests, suggesting that some people may derive greater benefit from the sleeve than others. Although the sleeve effects were small, particularly during the supine closed kinetic chain test, 72% of subjects felt that the sleeve improved their overall test performance. Future research is needed to establish the functional relevance of the small sleeve effects observed and to identify the characteristics of people who might derive greatest benefit from sleeve use. 相似文献
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ZA12锌铝合金挤压轴套的研制 总被引:1,自引:0,他引:1
采用挤压法试验生产ZA12锌铝合金轧套,制品表面光洁、无裂纹、显微组织和机械性能均优于铸件,耐磨性能优于ZQSn6-6-3;与铸造法相比可节约材料费用54%。 相似文献
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针对宝钢分公司2050热轧精轧机扁头套使用寿命低的问题,分析了扁头套的自身质量及精度,扁头套与轧辊扁头间的间隙冲击扭振,工作辊直径误差等方面对精轧机扁头套失效的影响,进而制定提高扁头套的额定传递扭矩,减小间隙冲击扭振,减小工作辊的"上压"或"下压"等改进措施并加以实施,从而使扁头套的使用寿命提高了一倍.同时还通过对间隙冲击扭振对扁头套失效影响的分析,提出间隙冲击扭振问题是精轧机机械传动系统失效的关键. 相似文献
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采用对比疲劳试验方法,研究了相对挤压量、终铰参量、衬套开缝放置角度等工艺参数和特征对开缝衬套挤压TA15钛合金连接孔疲劳增益的影响。结果表明,开缝衬套挤压技术可有效提高TA15钛合金孔结构疲劳强度,延长其疲劳寿命;相对挤压量越大,孔挤压疲劳增益越大,但是TA15钛合金对挤压量非常敏感,微小的相对挤压量波动会导致显著的疲劳增益波动;在完全去除开缝衬套在孔壁遗留的材料凸脊前提下,0.190 mm和0.065 mm两种单边终铰参量对TA15孔结构挤压疲劳增益有明显影响,0.190 mm单边铰削量时挤压疲劳增益更大,而非终铰参量越小越好;在smax=400 MPa,R=0.1疲劳载荷条件下,衬套开缝与试样最窄截面平行放置,仍能够获得明显的疲劳增益,但相对于与试样与最窄截面呈90°放置,疲劳增益会略有下降,建议在实际孔挤压操作中,衬套开缝尽量避开最窄截面放置。 相似文献
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风口小套是高炉的关键设备,是热交换极为强烈的冷却元件,其在高温状态下不间断地受到液态渣铁和煤粉的冲刷,是高炉易损的设备。风口小套的破损与更换已成为高炉无计划休风增多的主要原因,针对如何优化风口小套供水条件来提高风口小套使用寿命,进行探讨。 相似文献
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Effect of Surface Texturing on CPT Friction Sleeve Measurements 总被引:1,自引:0,他引:1
Jason T. DeJong J. David Frost P. Ethan Cargill 《Canadian Metallurgical Quarterly》2001,127(2):158-168
As the use of the cone penetration test (CPT) has increased for geotechnical site characterization, significant research has been performed to identify and control the factors that affect the tip (qc), sleeve (fs), and pore pressure (u) measurements. However, a number of factors that affect the friction sleeve have yet to be understood, appreciated, and accounted for in penetrometer designs. This paper highlights a number of these issues, with specific attention centered on the effect of surface texturing on the friction sleeve measurement. An understanding of the role of surface roughness on soil-geomaterial interfaces provides a framework for analyzing the effect on the friction sleeve measurement and could provide a basis to improve its design. A series of CPT soundings were performed in the southeast United States with conventional smooth and textured friction sleeves. Results indicate that friction measurements with a textured sleeve are 70% greater on average than the value obtained with a conventional smooth friction sleeve in sand and provide a basis for developing new design procedures where interface values are required. 相似文献