镜铁山铁矿低贫化放矿的初步实践

镜铁山铁矿在Ⅱ号矿体进行了低贫化放矿的现场试验。初步实践表明，试验取得了较好的技术经济指标，在矿石回采率基本不变的条件下可大幅度降低岩石混入率，提高出矿品位。低贫化放矿方法已在全矿推广应用，获得了较好的经济效益。     

自然崩落法在铜矿峪矿的巨大进展

铜矿峪铜矿在从国外引进自然崩落法采矿工艺的基础上,通过国内科技攻关,在可崩性研究、开采技术和放矿管理等方面取得了令人瞩目的成就.本文概略地介绍了这些方面的经验和今后努力的方向.     

CAD的二次开发在锻件毛坯图中的应用

本文阐述了以AutoCAD2 0 0 0及其内嵌的VBA为开发工具 ,并以多年来一直延续下来的锻件毛坯图技术标准为开发依据 ,对AutoCAD2 0 0 0进行二次开发的基本思路和方法进行深入研究和探讨 ,在实际工作中取得了良好效果。     

异形台阶孔件的成形工艺与数值模拟

冷成型工艺多用于实体件和套筒件的加工,对于具有台阶孔的零件,在生产领域应用极少。EPB传动螺母是一个异形台阶孔件,其台阶小孔与大孔值差较小,且外部成形端在大孔端,成形工艺较为复杂。根据经验,利用三维软件设计加工工艺,并利用冷成型分析软件Deform-3D进行数值模拟,分析其可行性。     

基于Dynaform的印涂铝盖拉深压边力控制技术

起皱和拉裂是印涂铝盖在冲压拉深过程中的两大主要缺陷,合适的压边力对防止起皱和拉裂具有十分重要的作用。实际中,通常采用理论计算和模具调试的方法来获得合适的压边力数值,但理论计算方法计算复杂、可操作性差,而模具调试繁琐且费时费工。针对这一问题,以非线性有限元分析软件Dynaform为平台,对印涂铝盖冲压拉深工艺过程和压边力进行数值模拟和理论分析,确定了压边力的合理范围,并根据压边力范围试冲产品以确定最佳压边力。结果表明,1716印涂铝盖首次拉深的压边力数值的合理范围为7~8.8 k N,最理想的压边力数值在8.8 k N附近。该方法减少了压边力调试的盲目性,缩短了模具调试时间,减少了模具调试难度,最终达到降低产品制造成本的目的。     

庞庄煤矿深层开采锚网支护的研究

通过对煤层深层开采回采巷道的变形力学性质的分析 ,提出了煤层深层开采回采巷道的支护控制原理及支护改进措施 ,在此基础上计算了巷道的破坏范围、锚杆的支护参数 ,对地下工程建设有一定的参考价值。     

Pro/E三维造型向AutoCAD二维图形的转换技术

介绍了将Pro/E参数化实体造型同现行的AutoCAD绘图相结合进行产品设计的方法 ,该方法在Pro/E中建立三维模型 ,然后转换为二维平面视图 ,并将其以dwg格式输出 ,提供在AutoCAD中调用。应用该方法将提高产品设计的效率。     

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.     

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.     

应用DPS和RTK技术进行电厂大比例尺地形图测量

在内蒙古某电厂1∶2000地形图测量中,采用了DPS和RTK技术进行大比例尺地形图测量,外控作业应用了区域网和全野外布点法相结合的方式;地质、水文专业应用厂区三维立体模型进行剖面数据的采集工作,实现了航测数据多专业的共同应用。