共查询到20条相似文献,搜索用时 48 毫秒
1.
2.
天津钢管集团股份有限公司于2008年4月建成投产了目前世界上最先进的Ф258PQF连轧管机组,这是公司的第3套PQF连轧管机组。介绍了Ф258PQF连轧管机组的工艺流程,同时对该机组的穿孔机、PQF Plus连轧机、脱管机和定径机的技术参数和设备特点以及工艺控制系统和质量保证系统进行了说明。 相似文献
3.
4.
在三机架可逆连轧实验机组上,对H型钢的轧边—万能连轧过程进行了综合实验研究,探讨了轧辊线速度不平衡对连轧张力,连轧张力对前滑、翼缘宽展、力能参数的影响规律,得到了一系列轧边—万能连轧工艺资料,对H型钢的轧边—万能连轧工艺参数设计、自动控制系统连轧数学模型的建立以及轧机设计具有重要的参考价值。 相似文献
5.
MPM和PQF轧管工艺 总被引:1,自引:0,他引:1
连轧管机是生产无缝钢管的高效轧机,限动芯棒连轧管机代表着现代无缝钢管生产的先进技术,MPM和PQF同为限动芯棒连轧管工艺,对此2种连轧管工艺的特点进行了详细的分析. 相似文献
6.
关于连轧张力微分方程的讨论 总被引:2,自引:0,他引:2
在研究连轧过程中,张力是十分重要的参数,要正确控制连轧过程,需要研究张力变化的规律和它与轧制诸因素关系的数学表达式,它不仅用于张力调厚控制,在整个连轧过程控制中也要应用。因此,连轧工作者都重视张力方程的研究,早在廿年前R.A.phillips就建立了目前常用的张力微分方程,以后和相继进行了研究和讨论。我国连轧数学模型研究工作中对此也开展了讨论,《钢铁》发表了“连轧张力公式” 相似文献
7.
8.
PQF轧机是一种新型连轧管轧机,以其高质量、高产量和高技术水平等系列优点成为当今热轧无缝钢管生产技术的主流。孔型设计是连轧管工艺的核心,而轧件出口断面积是孔型设计中最重要的参数之一。通过理论推导的方式得出不同孔型形状的轧件出口面积。 相似文献
9.
连轧张力公式 总被引:5,自引:0,他引:5
连轧生产过程电子计算机控制的发展,需要能反映"流量常数"不相等条件的数学表达式.由动平衡条件建立了连轧张力微分方程:dσi/dt=E/l[V'i 1-Vi][1 σi/E].利用生产实践和实验研究中认识的物理规律,如体积不变规律、前滑与张力成线性关系,推导得到连轧状态方程:σ=-γ-1Aσ E/ιBU,动态张力公式:σ(t)=e-γ-1Atσ0 A-1(┕)I-e-γ-1At」W-1△V;稳态张力公式:σ=A-1m-1q.张力公式反映了连轧过程中张力、厚度、轧辊速度及时间之间的函数关系.证明了连轧工艺过程是渐进稳定的,可控的和可测的动力学系统,并提出张力公式预报钢板厚度的设想. 相似文献
10.
11.
《China Nonferrous Metals Monthly》2014,(10)
<正>Recently the National Commission of Development and Reform again assembled experts to solicit opinions,and discussed new electricity reform program.According to information disclosed by experts attending the meeting,in the future electricity reform will undergo top-down design,possibly a 相似文献
12.
《China Nonferrous Metals Monthly》2014,(10)
正Since the release of Implementation Opinions on Carrying out‘Guiding Opinions of the State Council on Resolving Serious Production Overcapacity Conflicts’,according to the actual situation of industry,Qinghai has focused on electrolytic aluminum,cement,ironsteel(including iron alloy and silicon carbide), 相似文献
13.
<正>2.Tianjin Scrap Metal Market In Tianjin,we mainly visited Jinghai Ziy Town scrap market and Binhai New Area’some copper scrap enterprises and enterprise using copper scrap.In Ziya we felt the coppe scrap market was particularly deserted,mos copper scrap enterprises in the town wer closed,industry insiders said in 2012 the plac here was bustling with activity.According to 相似文献
14.
《China Nonferrous Metals Monthly》2014,(10)
正Clearing House Financial Markets Co.,Ltd.(Shanghai Clearing House)General Manager Xie Zhong told the media recently at the briefing of the international symposium of"Reform Deepening and Mechanism Innovation of the Post-crisis Kerb Market",Shanghai Clearing House will explore the feasibility of carrying out bond business in 相似文献
15.
《China Nonferrous Metals Monthly》2014,(11)
正After over 60 years of developmnt,a system for RD and production of copper processing materials has already taken shape in China.After the reform and opening-up,the application of copper processing materials has gradually expanded from the military industry to civil field.The annual output of copper 相似文献
16.
《China Nonferrous Metals Monthly》2014,(11):1-2
<正>According to a survey report conducted recently by China Geological Survey Development Research Center,in the first half of 2014,China’s mineral exploration market continued to decline,with the investment in exploration of non-fuel minerals dropping by13.7%and drilling workload dropping by21.7%.According to statistical analysis of the Center, 相似文献
17.
正On June 3,Chinalco and China National Administration of Coal Geology signed cooperation agreement for strategic cooperationcooperation agreement between Chinalco Guangxi Nonferrous Rare Earth Development Company and Xuzhou Jin Shi Pengyuan Rare Earth Material Factory.According to the agreement,both sides would jointly support Chinalco Guangxi Nonferrous Rare Earth Development Company and Xuzhou Jin Shi Pengyuan Rare Earth Material Factory to carry out comprehensive cooperation covering rare 相似文献
18.
19.
20.