HDC-7000铜管高速拉拔专用外模油研究

通过对油品的润滑性、粘附性、耐高温性．清洗性等进行详细的研究,开发出一种新型的高粘度铜管高速拉拔外模专用油,不仅解决了铜管生产过程中油烟对工作环境污染和对人体的伤害,而且避免了铜管表面的擦伤,保证了铜管良好的表面质量。     

高强高导电极材料铜铬锆合金新工艺研究

主要记述了当前铜铬锫合金材料的生产技术水平和产品要求，生产工艺试验研究与制定，铜-铬-锆合金捧材新工艺开发生产过程。通过对铜-铬-锫合金新工艺的试验及结果分析，制定出一套切实可行的产业化生产方法。     

Effect of annealing on the optical and mechanical properties of cold drawn polypropylene fibres

Refractive indices and birefringence changes with strain produced by different stresses in annealed and unannealed polypropylene fibres (4 : 1 draw ratio, 515 tex polypropylene from Bolton, UK) were measured interferometrically. Calculations were carried out using multiple-beam Fizeau fringes in transmission to determine the Cauchy's constants, dispersive coefficient and the dielectric constant at infinity. The orientation factor and orientation angle of the fibre material were calculated for different strain values. Poisson's ratio and the strain optical coefficient were also determined. An empirical formula is suggested to correlate the orientation factor, orientation angle, area of cross-section and birefringence with the draw ratio, and the constants of this formula were determined. The effect of the draw ratio on the refractive index profile was studied. Microinterferograms and curves are given as illustrations.     

SHAPE SENSITIVITY ANALYSIS FOR STEADY METAL-FORMING PROCESSES

This paper develops a numerical technique for determining the shape sensitivity parameters in steady metal- forming processes such as drawing and rolling. The adjoint method is applied to the discrete non-linear system of equations in the finite element model in order to determine the discrete matrix of sensitivity parameters. In this work, two specific cases are considered. The first case involves determining the sensitivity of the process power requirement to the process geometry and the second case involves determining the sensitivity of the internal state variable distribution in the final product to the process geometry. The process geometry is assumed to be characterized by a finite number of shape parameters. The internal state variable distribution in this case represents the resistance to plastic flow and is considered to be related to the quality of the final product. Numerical examples for a simple drawing process are presented to demonstrate the efficiency of the algorithm.     

板料拉伸成形多点压边力优化

介绍了板料拉伸过程中压边力控制发展史及发展预测,提出了一种压边力优化方法———多点压边力方法,并通过ANSYS软件模拟出矩形盒件拉伸成形过程多点压边力优化曲线。     

大新锰矿西北重叠矿体矿石运搬工艺系统优化

矿石运搬工艺系统的连续性、经济性是矿山技术管理的重要内容。基于大新锰矿西北采场重叠矿体开采现状,分析了现有矿石运搬工艺系统存在的问题,并在初选方案的基础上确定了4种运搬工艺优化方案。通过对优化方案的技术经济和系统性比较分析,综合确定出下盘脉外运输巷道b方案(Ⅰ矿与Ⅱ、Ⅲ矿采用瀑布式共用溜井）为最优的运搬工艺系统方案。最优方案具备的优点：减少了Ⅰ矿的电耙级数,提高了出矿效率;整合了Ⅰ矿和Ⅱ、Ⅲ矿溜井结构,体现了出矿结构布置的系统性;降低了生产成本,增大了矿石回采率,经济上实现了最优。研究成果可为类似多层缓倾斜薄矿体开采矿石运搬工艺系统设计提供技术参考。     

面向汽车覆盖件的拉延模快速设计及其实现

覆盖件的设计与生产是汽车制造业的重要组成部分,以覆盖件拉延模的快速设计为 研究目标,具体产品为导向,在设计模板的基础上,智能化修改与替换部分关键组件而形成新的 设计方案,以达到最小化工作量的目的。首先根据汽车覆盖件拉延模的实际模型和工艺,对拉延 模组成零件进行合理分类并建立嵌入设计知识的模板,新的设计替换模板中关键组件,系统自动 根据需要加入工艺信息,修整模型曲面以适应实际需要。实践证明,该方法可以有效地重用既往 设计经验,减少设计错误,提高设计质量。     

面向画法几何教学的新型教具开发和

针对画法几何中实物演示教具更新缓慢问题,利用旋转机构、滑块导轨机构、双滑 块摇杆机构以及单片机控制开发了一种新型画法几何综合演示教具,实现了画法几何中投影特 性、典型例题展示等一体化操作演示。通过线的求解、线面相交问题的求解和换面法问题求解, 进行了具体实例操作应用,展示了本教具的应用方法。所开发的教具不但适合教师用于辅助教学, 也是学生用于自主性学习的有利工具和丰富资源,具有较广泛的应用价值。     

球形件反复拉深成形工艺有限元模拟及试验

提出了球形件反复拉深成形工艺,对该工艺进行了有限元模拟与试验验证。与一次拉深成形工艺进行了对比分析,结果表明：凹模圆角区与法兰区应力状态及大小基本相同,但在球底区,反复拉深时径向应力和周向应力都远小于一次拉深的应力,球底区径向应力和周向应力基本为压应力或很小的拉应力;反复拉深时球底区厚度方向应变明显减小,一次拉深、二次反复拉深、三次反复拉深成形的制品最薄点减薄率分别为0.189、0.122、0.049,三次反复拉深可实现近等壁厚制品的拉深成形。该工艺与筒底冷校形工艺相结合,可实现近等壁厚深筒形零件的拉深成形。     

基于动态图纸的变电站二次回路仿真培训系统

介绍了一种动态化变电站二次设计图纸的二次回路仿真培训系统。该系统采用自动建模技术将CAD版的变电站二次设计图纸自动转化为动态仿真图纸,并与变电站一二次设备三维仿真系统一一对应,可在三维场景里对二次回路元件进行测量、操作,同时,也可在仿真图纸界面看到对应的二次回路原理图、节点图等实时反映的元件状态变化。系统采用一种简单实用的二次回路计算方法可快速准确地计算变电站二次回路各节点电气量,为二次回路仿真测量、元件动作逻辑提供数据支持。该系统在南方电网超高压输变电公司南宁局投入使用,以500kV南宁变二次回路为仿真对象,实现了二次回路仿真。