基于PC/104冲床装模高度监测控制器的研制

针对冲床装模过程中由于人工操作而引起的误差大、效率低等问题,设计了一种基于嵌入式计算机系统的装模高度监测控制器.该控制器选用PC/104总线单板电脑作为主控制器,配合于外部的SSI接口数据采集、人机交互和电机控制模块,实现对模具信息管理,装模高度监测及控制等功能.该控制器精度高、功耗小、成本低、结构坚固,特别适于小型冲床设备的加工过程及操作现场,有较好的市场应用前景.     

H62黄铜微齿轮热挤压模具的设计

采用拼接法设计了模数m=0.125 mm、压力角α=20°、齿数z=6、齿顶圆直径d=1 mm的H62黄铜微齿轮热挤压模具。优化了关键模具结构,用碳化钨硬质合金做挤压针、4Cr5MoS iV1做其他模具材料,采用尺寸为3 mm×3 mm的H62黄铜坯料,在G leeb le-1500D热模拟实验机上实现了650℃正向热挤压,挤出了成形状况良好的微齿轮。     

Numerical investigation into the influence of the punch shape on the mechanical behavior of pharmaceutical powders during compaction

During the production of pharmaceutical tablets using powder compaction, certain common problems can occur, such as sticking, tearing, cutting, and lamination. In the past, the compressibility of the powder was calculated only along the axis of the device; consequently, critical areas of the material throughout the volume could not be identified. Therefore, finite element method （FEM） can be used to predict these defects in conjunction with the use of an appropriate constitutive model. This article summarizes the current research in the field of powder compaction, describes the Drucker-Prager Cap model calibration procedure and its implementation in FEM, and also examines the mechanical behavior of powder during compaction. In addition, the mechanical behavior of pharmaceutical powders in relation to changes in friction at the wall of the system is examined, and the dependence of lubrication effect on the geometry of the compaction space is also investigated. The influence of friction on the compaction process for the flat-face, fiat-face radius edge, and standard convex tablets is examined while highlighting how the effects of friction change depending on the shape of these tablets.     

破碎激冷层对压铸件性能影响的分析

本介绍了压铸件中破碎激冷层现象，分析了其产生的原因、对产品质量的影响，提出了减少破碎激冷层的办法，对提高耐压、受力压铸件的质量具有一定的指导意义。     

口模拉伸共聚高密度聚乙烯单丝的取向结构探讨

口模拉伸共聚高密度聚乙烯单丝的取向结构探讨益小苏邹湘坪（浙江大学高分子系杭州３１００２７）谭洪生（齐鲁石化公司树脂所淄博２５５４３６）关键词共聚型聚乙烯，增强型单丝材料，Ｃｏｘ复合材料模型，Ｇｉｂｓｏｎ＆Ｗａｒｄ晶桥模型，口模拉伸工艺高密度聚乙烯（...     

模具失效分析与对策

模具失效是指模具丧失了正常工作能力,不能生产出正品。模具失效的基本形式有断裂与疲劳、塑性变形、磨损、咬合、冷热疲劳等。模具的服役条件有机床精度与刚性、被加工件变形抗力及表面状态、模具预热、锻造温度、润滑条件、冷却条件等。在一定的服役条件下,造成模具失效的关键因素有模具结构、模具机加工质量、模具材料和热处理等。     

彩电零件多工位级进模CAD/CAM系统

本文为建立彩电零件多工位级进模CAD/CAM系统,研究开发了板料零件的特征构型、条料排样、模具结构设计和NC编程软件.本文阐述了该系统的功能、结构、运行流程和实现方法.     

基于TVFIN的压铸模排溢系统溢流口设计方法

根据真值流推理网络（Ｔｒｕｔｈ－ｖａｌｕｅｄＦｌｏｗＩｎｆｅｒｅｎｃｅＮｅｔｗｏｒｋ，简称ＴＶＦＩＮ）的作用，通过对压铸模排溢系统溢流口截面积Ｓｖ与浇注系统内浇口截面积ＳＧ之比值Ｓｖ／Ｓｃ的模糊推理，进行了溢流口的设计。     

锥形模镦锻规则探讨

本文根据金属在锥形模中的变形特点, 求出了模壁对弯曲毛坯第一个支撑点的位置和毛坯在锥形模中的最大弯曲;确定了锥形模膛的最小长度、模腔锥角与毛坯长度的关系;利用压杆塑性稳定条件,导出了锥腔的临界角;提出了不产生塑性失稳镦锻的综合条件.