明弧堆焊工艺研究及在连铸辊上的应用

介绍了明弧堆焊的原理和特点，针对连铸辊使用工况和失效形式，合理设计和制定了明弧堆焊材料与工艺，对不同焊后热处理的试样进行了组织，机械性能和耐磨性等试验分析，结果表明，1^#试样的综合性能最好，更适合于连铸辊的实际工况要求。使用结果表明，明弧堆焊连铸辊使用寿命是埋弧堆焊连铸辊使用寿命的2倍以上。     

连铸辊表面堆焊技术的应用进展

分析了炼钢厂连铸辊部件表面堆焊技术的发展现状及应用空间,分别从连铸辊母材、焊材成分、堆焊技术、用户需求等维度,阐述了连铸辊表面堆焊技术的应用进展。目前,连铸辊表面改性技术领域,以表面堆焊技术为主流技术。其它表面处理技术(如激光熔敷技术、热喷涂技术等)仅仅处于试验研究阶段,堆焊技术仍然具有较大的工程应用技术优势。连铸辊表面堆焊技术的应用应使产品全生命周期价值最大化,实现与用户共赢。     

攀钢连铸堆焊复合辊研制与应用

选择了国内通用的单丝埋弧焊成熟技术堆焊连铸辊。通过实验室对比了１５ＣｒＭｏ辊芯母材的堆焊金属的性能，选择并优化堆焊工艺参数，使堆焊的连铸复合辊实物水平达到了企业内部技术条件。经工业装机试验表明，堆焊的连铸复合辊较１５ＣｒＭｏ普通连铸堆焊辊使用寿命提高３￣６倍。     

美国林肯焊丝在板坯连铸辊复合堆焊中的应用

选用美国林肯电气公司焊接设备和技术以及焊丝，对板坯连铸辊进行堆焊。介绍了连铸辊复合堆焊方法和堆焊工艺参数，堆焊辊比未堆焊辊提高寿命１－２倍。     

提高连铸机用辊子使用寿命的技术

1　前言为提高连铸机的生产效率和实现节能、节省资源的目的 ,以前用的喷镀连铸机辊 (以下称连铸辊 ) W2 4 0 ( 0 .0 8% C- 1 3.3% Cr- 4.0 Ni)满足不了热裂纹和水蒸气的双重损坏 ,需要改进。在试验研究基础上开发的缓慢冷却型连铸辊用材料是耐热不锈钢堆焊合金 Super KBS( 0 .1 6% C-1 2 .9% Cr- 0 .1 % Ni- Co.Mo.V.Cu) ,同时也开发出强冷却型连铸辊用材料析出硬化不锈钢堆焊合金 W630 ( 0 .0 4 % C- 1 7.1 % Cr- 4.5 % Ni- 4.5 Cu- 0 .1 2 Nb)。本文拟叙述一下此次开发的缓冷型和强冷型用辊堆焊材料的设计思想 ,开发堆焊材料的…     

辊孔自动堆焊技术开发与应用

炼轧生产线的连铸机上会有大量因辊孔磨损被更换下来的连铸辊,可以通过堆焊修复再利用,因此研发了一台OTC工业机器人,集焊机、PLC控制系统、滚轮架等设备于一体,实现了对连铸辊辊孔进行自动堆焊的功能.辊孔堆焊机器人在生产使用中性能稳定,效率比人工堆焊提高了2倍.     

舞钢连铸辊堆焊设备的改造实践

连铸辊在连铸生产中会产生表面裂纹、磨损、弯曲、剥离掉肉等缺陷,严重时不但影响其使用寿命,还直接影响到钢坯质量。采用堆焊方法既可以消除这些缺陷,同时还能取得修旧利废和提高钢坯质量的双重目的。舞钢充分利用报废CDZ6140车床和闲置ZD5-1250自动埋弧焊机,将其改造成连铸辊埋弧自动堆焊的专用设备。缺陷连铸辊经过堆焊、加工和修磨,完全满足连铸生产的工艺要求,达到了新连铸辊的质量和使用寿命。     

辊子长寿化的新技术——Weldclad堆焊技术

堆焊技术一直作为辊子和备件的重要修复手段。英国考维尔Corewire公司的Weldclad堆焊技术是根据辊子工况要求,设计选择相适应的辊子长寿化的堆焊材料,使辊子寿命提高3-5倍。考维尔公司研究开发出上百种适合各种辊子的表面堆焊材料,已成为世界三大冶金设备巨头(奥钢联、达涅利、西马克)辊子设计首选的堆焊材料,其辊子制造规范VAI-TSC-4,Danieli都是他们与考维尔公司共同研究制定的。Weldclad发明的摆动埋弧堆焊技术和自动堆焊设备,可使用户的各种辊子寿命得到显著提高,得到用户的认可,产品销往世界各地。Weldclad堆焊技术在连铸设备上的应用连铸辊是板坯连铸机上最关键的备件,承担着承     

唐钢机械(重机)装备公司

正唐钢机械(重机)装备公司是唐钢非钢产业的骨干企业之一。本公司拥有喷涂堆焊辊、激光熔敷修复、连铸连轧成套设备与备件、环保设备等四大核心技术和主导产品,获国家专利12项。主导产品目录1.连铸连轧成套设备与备件:生产各类轧辊、连铸连轧设备、卷取助卷及卸卷设备、各种包车、辊道等。2.喷涂堆焊产品:冷轧工艺辊、沉没辊、稳定辊、炉辊,热轧层流冷却辊、风机叶轮、天车轮、连铸辊、支承辊、轧辊等。     

板坯连铸机辊套的堆焊修复

分析了新钢公司板坯连铸辊损坏原因,阐述了采用埋弧自动堆焊工艺修复连铸辊的措施及方法,并对修复后连铸辊的质量及效益进行了分析对比,达到了降本增效的预期效果。     

论从实践理解世界的物质性和自然世界的先在性

马克思主义唯物论是一种物本主义形态的唯物论,还是一种超越物本主义形态、从实践理解世界的本质相关问题的实践的唯物主义的唯物论?这是一个我们必须搞清楚的有关马克思主义唯物论的本质规定性和精神实质的重大问题.在考察物本主义的唯物论及其思维方式的局限性的基础上,揭示了马克思主义唯物论是现代的、实践的唯物主义,并重点研讨了马克思主义唯物论关于从实践理解世界的物质性和自然世界的先在性的原理,以期为马克思主义唯物论进一步阐明人类世界的实践性原理奠定基础.     

Effect of cyproheptadine on the ultrastructure of the neurons of the arcuate nucleus in the hypothalamus of the rat

The data are presented on changes in the rat arcuate nuclear neuron ultrastructure after using cyproheptadine (peritol, Egyt Pharmaceutical Works, Hungary) in a water suspension at a dose of 20 mg/kg once daily during 7 successive days and twice a day within 10 days. It was shown that cyproheptadine decreases the functional activity of the arcuate nuclear neurons, depending on the total amount of the drug used. Cyproheptadine-induced inhibition of the forming neurohormone release from neurons is likely to be one of the mechanisms of its therapeutic effect in Itsenko-Cushing's disease.     

Characteristics of the sympathetic innervation of the nictitating membrane and of the vasculature of the nose and tongue of the cat

Vasomotor responses from the nasal mucosa and tongue, and contractions of the nictitating membrane, were recorded on stimulation of the cervical sympathetic or internal carotid nerves. Preganglionic sympathetic nerve fibres which elicited a membrane response possessed a lower threshold than those which evoked nasal vasoconstriction, while the latter displayed a lower threshold than fibres which evoked tongue vasoconstriction. The sympathetic vasodilator fibres to the tongue whose activity was revealed after alpha-receptor blockade, had a similar threshold to the vasoconstrictor fibres. Membrane contraction, nasal vasoconstriction and occasionally tongue vasoconstriction could be evoked by stimulating the internal carotid nerve. The postganglionic fibres innervating the nasal mucosa had a similar threshold to those of the nictitating membrane, which may indicate that there are small myelinated fibres innervating the mucosa. The preganglionic compound nerve action potential had four major components, S1-S4. S1, S2 and usually S3 fibres were associated with membrane contraction; S2, S3 and sometimes S1 fibres were associated with nasal vasoconstriction; and S3, usually S2 and occasionally S1 fibres were associated with vasoconstriction in the tongue. It is concluded that each of these three groups of nerve fibres, but not S4 fibres, may include fibres associated functionally with the three effectors. There was a considerable difference between the relative amplitude of the responses of the three effectors elicited by stimulation of the cervical sympathetic nerve at frequencies between 0.2 and 2 Hz. Vasoconstrictor responses were relatively larger than membrane contractions suggesting differences in the mechanisms of neurotransmission at the neuroeffector junctions.