Q690材料应用于液压支架中的焊接工艺

根据对Q690材料在焊接液压支架结构件时的加工经验,通过Q690材料的特点简单介绍了Q690材料的焊接工艺。相比于其他材料,低合金钢在焊接中应注意焊前预热、焊后保温及探伤,并提出气温和天气对焊接的影响。为Q690材料的应用提供参考。     

ZY8600/25/53型液压支架结构件焊接工艺研究

通过分析ZY8600/25/53型液压支架高强板焊接性,研究焊接关键技术,形成完整可靠的工艺方案、工艺措施,包括焊接材料的选择、结构件的点组、预热、保温、层间温度要求、焊接方式、焊接参数及焊后热处理。以保证支架结构件在使用过程中动作可靠、尺寸稳定,预防焊接过程中产生冷裂纹、热裂纹及气孔现象。     

液压支架掩护梁常见焊接缺陷及预防措施

介绍了S690Q高强度结构钢液压支架掩护梁生产中常见的焊接缺陷,从焊接参数和质量控制等方面对产生原因进行了分析,并制定了相应的焊接工艺,在液压支架掩护梁的生产中取得了不错的效果。     

液压支架结构件设计制造研究

结合多年来从事液压支架制造的经验教训,从支架结构设计、焊缝接头设计、焊接材料与母材的匹配、焊接工艺参数的确定等多方面论述了液压支架设计、制造方面应该注意的问题和需采取的措施,为提高和保证液压支架结构件质量,合理选择连接结构、焊缝结构、焊接材料、焊接工艺参数提供了有效的依据。     

液压支架顶梁焊接变形控制研究

液压支架在煤矿采掘中起着支撑工作面的作用,是开展煤矿机械化综采的重要设备之一。液压支架的制造工艺多以焊接为主,但是焊接过程中由于结构件受热不均等其他因素的影响,容易造成焊接变形,从而影响焊接质量,进而影响焊接支架的使用性能。其中,顶梁是液压支架中承力的关键部件,其焊接质量直接影响着焊接支架的使用性能,因此对液压支架顶梁焊接变形控制的研究能够有效地提高煤矿生产效率及其安全性。笔者将根据多年在霍州煤电鑫钜煤机研究所的工作经验,对液压支架顶梁焊接变形的原因进行分析,并进一步控制液压支架顶梁焊接变形的操作技巧及相关的工艺措施。     

煤矿液压支架用S690Q调质钢焊接性能研究

采用斜Y形坡口焊接裂纹试验分析了S690Q调质钢的焊接接头裂纹敏感性。S690Q钢有明显的淬硬性,冷裂纹倾向较大,焊接时预热温度100℃以上可有效防止焊接冷裂纹的产生。分析不同焊接热输入下S690Q钢板的焊接接头性能变化规律,结果表明S690Q钢板的焊接质量良好、综合力学性能优良,S690Q能够满足煤矿液压支架的设计和使用要求。     

液压支架结构件焊接工艺研究

为提高液压支架制造质量,根据多年来从事液压支架制造过程中累积的经验,论述了焊接工艺参数的选取,焊接接头的选择,焊接应力的控制,焊接过程应力集中的预防,焊接残余变形的控制和预防等工艺措施。实践表明,采用这些工艺措施能保证支架结构件的焊接质量,并取得良好的效果。     

Q890高强度结构钢在液压支架应用的试验研究

对Q890高强度结构钢作为液压支架用钢的减重效果进行了分析,并对其焊接性能进行了研究,确定了合理的焊前预热温度和焊后回火温度。在此基础上,将Q890高强钢代替Q690高强钢并作为主要钢材制造了ZFY18000/28/53D样机,并进行了液压支架型式试验。结果表明,Q890高强钢焊接性能能够满足液压支架使用要求。     

浅析煤矿液压支架结构件焊接工艺

液压支架是煤矿采掘工作面的重要支护设备,其结构件复杂,制造要求高,焊接量大。焊接质量保证和焊接变形控制是支架制造的关键。通过对焊接工艺性能的分析评估,阐述了液压支架结构件的焊接工艺,并通过采取适宜的质量控制措施,有效地控制了焊接变形,保证了支架结构件的焊接质量。     

应力分析仪在液压支架设计、制造中的应用研究

针对液压支架的设计、制造,采用应力分析仪检测分析液压支架整架、结构件焊缝及油缸热处理工件的表面应力值,验证液压支架整架设计强度,优化液压支架结构件焊接工艺和油缸热处理工艺,保证液压支架设计和制造的可靠性,为煤矿工作面支护提供可靠的设备。     

Current situation and future trend of China rare earth luminescent material industry

<正>Rare earth luminescent material is one of the most important application sectors of rare earths.China enjoys the exceptional advantage to develop rare earth luminescent material for its abundant rare earth resources.After several decades'endeavor,China's rare earth luminescent material industry,headed by rare earth phosphor for lamp and LED and high efficient rare earth energy-saving light source,has been gradually developed into a scale industry.China has become a major production base of rare earth phosphor for lamps and rare earth     

China rare earth market review

正June 1~10,2014Rare earth market remained weak.Quoted price of rare earth products was similar to that in May.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,polishing powder and ceramic industries remained inactive.Demand from downstream industry was soft.Consumers purchased on their needs.Suppliers had strong intention to sell.Prices of rare earth products     

Annual Report analysis of Chinese rare earth-related listed companies in 2013

<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy     

Market opportunities and challenges for rare earth polishing powder

正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium     

Baotou Research Institute of Rare Earths developed a new RE alloy preparation technology

正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared     

Market and recycling of NiMH battery

<正>Market status and future trend of NiMH battery1.Global market of small NiMH battery Global market size of small NiMH batteries declined year on year since 2011.The trend will continue to 2018,at the rate of 5%to 10%annually.Demand for small NiMH batteries will be stable gradually.Many electrical apparatuses are powered by the built-in lithium battery today,which is the main reason for the shrunk market of small NiMH batteries.But,for some products,small NiMH     

China rare earth market review

正September 1-10,2014 Affected by the National Day holiday,rare earth transaction was stagnant and the market showed a weak steady state.As there was no good news for downstream market,some products with flat demand would likely rally slightly for some time to     

2014 second batch of rare earth quota released

正~~     

矿用防爆轴流对旋主要通风机叶片ANSYS模态分析及应用

高效节能矿用防爆对旋主要通风机的叶片是主要通风机运行的关键部件,叶片在运行时不断受到气流的作用力,从而使叶片产生振动,当叶片振动的频率与叶片的固有频率接近时,容易产生共振从而导致叶片的断裂。一旦叶片断裂时,对主要通风机的安全运行产生致命的影响,从而导致矿山、化工等企业发生重大事故,将会产生不可估量的损失。基于有限元分析软件ANSYS,对高效节能矿用防爆轴流对旋主要通风机叶片进行模态分析及产生对应的六阶模态频率,对主要通风机叶片的运行频率、固有频率及产生的共振问题进行了原理分析,并且解决了叶片频率共振的问题,从而为主要通风机叶片结构设计提供理论依据,并对主要通风机叶片的安全运行提供保障。     

2013 NdFeB export analysis

<正>China totally exported nearly 24,000 tonsof NdFeB products during 201 3,including 18,825 tons of permanent magnet,valued USD 1.34 billion at an average price of 71.4 USD/kg;3,277 tons of NdFeB magnetic powder,valued USD 1 01 million at an average price of 30.9 USD/kg;1,334 tons of strip casting ribbon,with total export value of USD 74million at an average price of 55.3 USD/kg;and 586