对20Ni9Co5Mo2Cr2V生产过程中问题的分析

分析了20Ni9Co5Mo2Cr2V钢历次冶炼的配料、真空感应熔炼及电渣重熔过程，找到了钢中C过度烧损、浇注的底垫鼓起及电渣重熔过程出现气孔的原因，为冶炼生产提出了建议。     

Influence of the gasket materials on the clamping pressure distribution in a PEM water electrolyzer: Bolt torques and operation mode in pre-conditioning

To keep optimally connected, all electrolysis cell elements is one of the most important design criteria. The optimal distribution of the clamping points is crucial to increasing cell performance. In this work, the compression pressure distribution inside of a 25 cm² PEM electrolysis cell was evaluated, using different materials: Teflon®, Viton®, ethylene propylene diene monomer rubber (EPDM), and nitrile rubber. Sealing material evaluation was performed taking as performance indicators: total compressed area (%) and compression pressure, for different torques applied. Pressure distribution was obtained by using pressure-sensitive films, analyzing the distribution of pressure points from three-dimensional plots (3D), and quantifying intensities of the images obtained. Results showed that pressure points distribution depends on the stiffness and thickness of the gasket materials. For a tightening torque of 3.70 N m, a pressure of 2.23 MPa is obtained with 85% of the membrane area compressed using nitrile rubber-EPDM gaskets.     

附加载荷作用下螺栓法兰连接的强度和紧密性分析

运用三维有限元方法模拟了垫片的非线性特性,分析了附加载荷对螺栓法兰连接结构的强度和紧密性的影响,确定了连接系统的紧密性、附加载荷和垫片残余压紧应力三者之间的关系。分析结果表明,附加弯矩对螺栓法兰连接结构的紧密性有较大影响。     

V型缠绕垫片的力学分析及性能研究

对V型缠绕式垫片进行简化力学分析，并通过合理的设计、性能试验加以验证。     

压力管道用金属波齿结构力学性能研究

304不锈钢波齿结构是柔性石墨金属波齿复合垫片骨架,其力学性能对垫片压缩-回弹性能有显著的影响,在45MPa轴向压紧应力下,采用弹性有限元法对钢板厚度为2mm,具有3种不同的圆弧半径、波齿距和齿数的波齿进行应力分析,找出304不锈钢材料几何结构与应力应变的关系,为工程实践提供科学指导。     

A study on the sealing performance of bolted flange joints with gaskets using finite element analysis

Gaskets play an important role in the sealing performance of bolted flange joints, and their behaviour is complex due to nonlinear material properties combined with permanent deformation. The variation of contact stresses due to the rotation of the flange and the material properties of the gasket play important roles in achieving a leak proof joint. In this paper, a three-dimensional finite element analysis (FEA) of bolted flange joints has been carried out by taking experimentally obtained loading and unloading characteristics of the gaskets. Analysis shows that the distribution of contact stress has a more dominant effect on sealing performance than the limit on flange rotation specified by ASME.     

聚氨酯材料在汽车空气滤芯中的应用

以自产聚醚多元醇为主要原料，研制成功汽车空气滤芯用聚氨酯密封材料。产品性能指标与国外同类产品相当。介绍池汽车空气滤芯用聚氨酯材料的原料、配方、性能及组合聚醚的使用情况。     

裂解炉注汽法兰泄漏原因分析及对策

针对大庆石化公司480kt/a改造新增80U裂解炉注汽法兰经常泄漏的问题进行分析,找出泄漏着火的原因,并提出在600～700℃高温下法兰密封的办法,在实际使用中证实该方法经济、适用、有效。     

不锈钢垫片的磨削加工

介绍了组合砂轮磨削不锈钢垫片时砂轮对加工表面质量和磨削力的影响。     

落料冲孔复合模具设计

通过对零件的工艺分析。改进了工艺方案。用一套复合模完成落料冲孔工序，阐述了垫圈冲裁复合模具的整体结构特点及工作过程，应注意的问题和装配工艺性。