阀体密封面加工工艺的改进

阀门产品能否保证密封性能的关键在于密封面的加工质量。中压截止阀阀体密封面的加工，有的采用在阀体基体上焊圈后精车和研磨密封面的生产工艺(简称“焊后精”工艺)，有的则采用在阀体基体上先压配密封圈后精车和研磨密封面的生产工艺(简称“压后精”工艺)，我厂原采用的就是这种工艺。     

不锈钢阀体零件的冷锻成形研究

不锈钢具有良好的延展性,与碳钢相比具有较大的冷加工硬化,常常需要增加工序间退火。由于不锈钢的特殊物理和力学性能,冷锻成形时需要在工艺和模具设计时考虑修正,否则容易出现粘模导致表面损伤,加快模具磨损。其种类主要有: (1)奥氏体不锈钢 具有不同的成分和性能,能够高速冷加工硬化,却不能依靠热处理硬化;延展性和韧性均优于铁素体和马氏体类不锈钢,如1Cr18Ni9Ti。     

阀体机械加工工艺的分析

本文通过对阀体机械加工工艺过程的分析,从阀体材料、加工工艺、加工质量以及数控技术的应用等方面进一步优化阀体的工艺规程,促进阀体的智能化生产。     

真空隔膜阀阀体螺孔的加工

￥江苏海门市轻工机械四厂＠盛炜生ＧＭ１０和ＧＭ２５型高真空隔膜阀阀体上分别有４个Ｍ５和Ｍ６螺孔需要加工（图１）,阀体为ＣＦ８精铸件。从工人劳动强度、产品制造成本、设备利用率及能源消耗等方面考虑,采用ＺＳ４０１９型台式钻攻两用机床加工。图１阀体ＺＳ４０１９型...     

阀体在空气锤上无飞边胎模锻

1．模锻方法的确定 阀体是石油机械上的易损件，客户提供的锻件图如图1所示，材料为40Cr。此锻件的特点为：头部有一个内表面不机加的盲孔，杆部较细长，锻件形状复杂系数为S3级，属较复杂锻件，工艺性较差。由于存在盲孔，决定了不论采用何种设备模锻，其分模面都必须与轴线垂直。若采用模锻锤模     

叠加阀阀体斜孔加工工艺

在液压系统的设计制造中,叠加阀以其结构紧凑、体积小、重量轻、占地面积小以及重新组装方便迅速、泄漏小、噪声低等特点越来越受到青睐。由于阀体结构紧凑、斜孔多,加工斜孔时,报废率高、夹具磨损快、维护费用高,为此我们对叠加阀阀体斜孔加工工艺进行了改进。     

楔式闸阀阀体密封面加工夹具

楔式闸阀阀体密封面加工夹具花山阀门厂付林胜刘超加工楔式闸阀阀体密封面时，必须保证两密封面斜度的准确性及对称性，它的加工精度直接影响到产品的密封性能。新设计制造的通用的楔式闸阀阀体密封面加工夹具（图１），省时方便，效果良好。在加工某一规格闸阀时，只需通...     

DY720-Y型管道阀体加工工艺

一、前言DY720—Y型管道阀体(见图1)是连接水管道、油管道的一种阀体,DY720属于大型阀体。中口法兰最初的加工工艺是在镗床上进行,中口法兰面与端法兰面有斜度65°要求。因而在镗床上装夹、校正非常困难,辅助工时占整个中口法兰加工工时的1/3,加工时镗刀更换频繁。为了提高效率     

不锈钢管接头精密成形的工艺分析与实验研究

不锈钢管接头截面积变化大，成形和脱模困难。本文对其塑性加工工艺方案进行分析比较，并通过工艺实验，验证工艺分析结果。该零件采用温挤压成形可以获得较好的技术经济效益；一次正挤压效率高，工艺力大；正挤-镦粗复合工艺则工艺力小，但效率较低。     

不锈钢脚阀在酸性介质中使用寿命的研究

研究了2种阀门常用材料AISI 304和1Cr18Niu9Ti不锈钢在HNO3，H2SO4，H3PO4和HCl溶液中的腐蚀特征，给出了2种不锈钢在酸溶液中的腐蚀速率和不锈钢阀门在酸溶液中的使用寿命。     

阀门用CF类不锈钢铸件性能分析

介绍了石化行业用CF类不锈钢阀门铸件的特点，冶炼及铸造过程中的重点和难点，对易出现的铸造缺陷做了简要分析，并提出解决问题的办法。     

球阀固定球体轴孔加工工艺改进

介绍了固定球球阀球体轴孔加工工艺。给出了一种高加工效率和高精度，适用于中小口径固定球球体轴孔加工的工装。     

The influence of low-strain thermo-mechanical processing on grain boundary network characteristics in type 304 austenitic stainless steel

Grain boundary engineering of austenitic stainless steel, through the introduction of plastic strain and thermal annealing, can be used to develop microstructures with improved resistance to inter‐granular degradation. The influence of low‐strain thermo‐mechanical processing on grain boundary network development, with systematic variations of annealing treatments, has been investigated. Three stages of the microstructure development during grain boundary engineering in low‐strain processing conditions are identified, and correlated with changes in grain boundary character and deviation distributions. Low‐energy connected length segments at triple junctions, which have been proposed to be responsible for crack bridging during inter‐granular stress corrosion cracking, can be influenced by the choice of the annealing treatment parameters. The development of individual grain boundary length segments of different character showed consistent trends with increasing grain size. Crack length predictions are consistent with the beneficial effect of designing microstructures with high fractions of twin grain boundaries and smaller grain size.     

Effects of laser shock processing on mechanical properties of laser welded ANSI 304 stainless steel joint

With the rapid development of engineering component with integration,high-speed and multi-parameter,traditional techniques haven’t met practical needs in extreme service environment.Laser welding,a new welding technology,has been widely used.However,it would generate the drop of mechanical properties for laser welded joint due to its thermal effect.Laser shock processing(LSP) is one of the most effective methods to improve the mechanical properties of laser welded ANSI 304 stainless steel joint.In this paper,the effects of LSP on the mechanical properties of laser welded ANSI 304 stainless steel joint have been investigated.The welded joint on the front of the tensile samples is treated by LSP impacts,and the overlapping rate of the laser spot is 50%.The tensile test of the laser welded joint with and without LSP impacts is carried out,and the fracture morphology of the tensile samples is analyzed by scanning electron microscope(SEM).Compared with the yield strength of 11.70 kN,the tensile strength of 37.66 kN,the yield-to-tensile strength ratio of 0.310 7,the elongation of 25.20%,the area reduction of 32.68% and the elastic modulus of 13 063.876 MPa,the corresponding values after LSP impacts are 14.25 kN,38.74 kN,0.367 8,26.58%,42.29% and 14 754.394 MPa,respectively.Through LSP impacts,the increasing ratio of the yield strength and tensile strength are 121.79% and 102.87%,respectively;the elongation and area reduction are improved by 5.48% and 29.38%,respectively.By comparing with coarse fracture surface of the welded joint,the delamination splitting with some cracks in the sharp corner of the welded joint and asymmetric dimples,LSP can cause brighter fracture surface,and finer and more uniform dimples.Finally,the schematic illustration of dimple formation with LSP is clearly described.The proposed research ensures that the LSP technology can clearly improve the yield strength,tensile strength,yield-to-tensile strength ratio,elongation,area reduction and elastic modulus of the welded joint.The enhancement mechanism of LSP on laser welded ANSI 304 stainless steel joint is mainly due to the fact that the refined and uniform dimples effectively delay the fracture of laser welded joints.     

超薄壁不锈钢回转盘的加工

薄壁不锈钢回转盘常规的切削加工方法易产生变形，采用左右两刀同时加工能达到零件精度要求。     

钢制阀门常用主体材料

介绍了适用于各种不同工况条件的钢制阀门主体材料常用的普通碳钢、普通低温钢、铬钼高温钢和奥氏体不锈钢等钢种所适用的标准。在简单介绍各类钢种的主要性能及其化学元素对材料的性能影响的基础上，对各类钢种又分别以铸件、锻件、板材和管材等4种材料类型对其化学成分和力学性能等进行了分析和比较。     

国际通用的阀门主体用铸钢材料

详细地介绍了国际通用的采用先进技术标准的阀门主体材料碳素铸钢、铬钼高温铸钢、铸造不锈耐酸钢、低温铸钢、高温不锈耐热铸钢等材料及其性能,并进行了铸钢和轧材性能的对比分析。     

有机硅涂层对316不锈钢的防护

研究了316不锈钢在高温（400℃）盐和水蒸气综合作用下的腐蚀行为及添加Al粉和Ti粉的有机硅涂层对不锈钢的防护作用。结果表明，316不锈钢裸样发生了较为严重的腐蚀。刷涂了有机硅涂层的316不锈钢在相同的条件下没有发生腐蚀，涂层对316不锈钢具有优异的防护作用．讨论了有机硅涂层的防护机理。