塑料与金属薄壳注射成型新技术

介绍薄壳的概念及其在工业生产中的地位及薄壳制品的设计要点,并就目前要用的高压注射成型方法进行了分析,还阐述了成型薄壳的多浇口技术,气辅成型技术,半固态金属注射成型技术。     

特殊注塑工艺在汽车工业中的应用及发展

以前的特殊工艺现在已经成为新的常规工艺,而且随着产业化速度的加快,研究开发到产业化之间的时间不断缩短。按照产品和技术的发展程度,综述了汽车用塑料注塑件的特殊注塑方法和发展趋势,并对其中一些技术关键作了介绍。     

KOH活化丝瓜络制备高比表面积活性炭

为了探讨以丝瓜络为原料制备高比表面积活性炭的最佳条件,通过设计正交实验,研究了碱炭比、活化温度、活化时间和升温速率等因素对KOH活化丝瓜络制备活性炭性能的影响。结果表明：KOH活化丝瓜络制备活性炭的最佳条件为：碱炭比为4、活化温度800 ℃,活化时间30 min,升温速率10 ℃/ min。在此条件下制备的活性炭为多孔、非晶型的无定形碳,具有高的比表面积（3545 m2/g）和强的吸附性能,其碘值和亚甲基蓝值分别达到2926 mg/g和528.58 mg/g;为丝瓜络的高值化利用提供了一条有价值的途径。     

基于CAE的汽车档位手球结构优化及模具设计

利用Moldflow对某汽车档位手球塑料件结构进行分析,以此为参考,对塑料件结构作一定的改进,并对改进后的塑料件进行模具设计,介绍了模具结构分析及相关设计要点,并通过实际试模得到了合格塑料件。     

塑料联接件的设计制造和使用

介绍常用塑料铰链联接，搭扣联接，卡夹联接，压力装配联接的联接件材料选择，成型方法，联接原理，形状设计等。     

薄壁件切削加工残余应力的模拟及实验分析

采用有限元软件Advant Edge FEM对薄壁件加工过程中残余应力进行仿真分析,得出残余应力和切削加工参数之间的关系,通过实验验证了模型的正确性和有效性,为残余应力的研究提供理论指导。     

火车车轮喷砂机自动夹持器圆柱凸轮有限元模态分析

圆柱凸轮是火车车轮喷砂机自动夹持器的重要零部件之一,建立圆柱齿轮的动力学控制方程,利用有限元软件对凸轮进行静力学和模态分析,得出应力云图及固有频率和振型等参数,为后续进行谐响应分析或者瞬态动力学分析提供理论参考。     

车顶蒙皮焊接工艺改进

西安某汽车厂客车蒙皮组焊件焊接采用CO2焊,生产效率低,焊接变形大,表面处理难度大,质量难以保证,使产品的质量和产量受到严重的制约,为此必须进行工艺改进.通过采用全自动缝焊焊接工艺及选择合理的工艺参数,在保证结构和强度的前提下,使蒙皮组焊件焊接表面质量大幅度提高,劳动强度大幅度下降,生产效率提高数倍.     

多侧孔零件冲孔模设计

介绍了一副典型的多侧孔冲孔模的设计分析和模具结构。由于多侧孔冲压件，大多数是侧孔布置在冲压件的周围，因而冲孔凹模只能放在冲压件的内部，往往受到冲压件体积的限制，这样冲孔凹模的强度和刚度都受到极大影响，该文介绍了两种方法解决这一问题，可供同行在类似产品设计中参考。     

Three-dimensional sheet metal continuous forming process based on flexible roll bending: Principle and experiments

To effectively manufacture three-dimensional sheet metal parts with various curvatures produced in small batch quantities, continuous sheet metal forming, a new flexible forming technology is being developed. This process employs an upper flexible roll and two lower flexible rolls as a forming tool, and the shape of a flexible roll can be changed in vertical direction. With the rotation of flexible rolls, the sheet metal is bent in longitudinal and transverse directions simultaneously and is formed continuously. In the present study, the three-dimensional surface of formed part is described by sweep surface based on the characteristic of the forming process and the arc-length parametric equation for describing continuous forming part is developed. The three-roll bending deformation of sheet metal in longitudinal direction is analyzed and the longitudinal curvature equation of the formed part is derived. The shape of flexible roll axis controlled at a number of points is represented by the cubic spline curve and the transverse curvature of the formed part after springback is then calculated piecewise. Typically experiments for forming concave shape surface and saddle-type surface have been performed, the experiment results are measured and analyzed by a binocular stereo vision measurement system, it is demonstrated that the formed surfaces are in good agreement with the desired shapes and the presented equations are useful for the continuous forming process design.