基于知识的级进冲模工步排样CAD技术的发展与展望

研究了基于知识的级进冲模工步排样CAD技术，分析、总结了基于模型和基于规则两种工步排样设计知识的处理方式，提出了将基于知识的工程（KBE）思想引入工步排样设计领域的方法，并建立了系统框架。     

冷冲压模具材料的合理选择

模具的使用寿命主要受材料和热处理工艺的影响.分析了模具材料性能、种类及特性,从而合理选择模具材料,提高模具寿命.降低成本.     

汽车冲压件模具开发项目中模具的验收

详细地论述了汽车冲压件模具开发项目中模具验收的各个项目及其技术要点、验收手段和验收方法。     

垫片套料联合冲裁模设计

以垫片套料冲裁模具设计为例,重点介绍了联合套料冲裁模的结构形式以及设计要点。通过对模具设计过程的阐述,对类似零件的冲裁模设计提供参考,具有一定的实际指导意义。     

Wear at the die radius in sheet metal stamping

In sheet metal stamping, it is known that wear is unevenly distributed over the die radius and that multiple wear mechanisms may occur simultaneously. However, there has been little or no work that details the types of wear mechanisms, and quantifies the locations at which they occur. Furthermore, the link between recently identified time-dependent contact conditions and the wear response is currently unknown. An experimental study is presented in this paper to examine the location, type and severity of wear that occurs over the die radius during a typical sheet metal stamping process. It is found that the wear over the die radius consists of a combination of ploughing and galling mechanisms. The relative severity of the ploughing mechanism is divided into two distinct zones on the die radius, which correlate well with the contact pressure and sliding distance behavior predicted in our recently published numerical study. The galling mechanism results in failure of the stamping process and is, therefore, critical to the overall tool wear response. Our analysis indicates that the severe contact pressure/small sliding distance conditions, which occur during the initial stage of the process, cause the galling behavior observed over the radius. Therefore, it is concluded that the overall tool wear response and tool life is primarily dependent on the initial transient stage of the stamping process.     

Optimal stamping direction for an automotive part

The International Journal of Advanced Manufacturing Technology - Stamping direction (SD) of an automotive part is investigated by using multi-objective optimization concerning forming process of...     

小孔冲压的工艺特点与模具设计

详细论述小孔冲压的工艺过程和工艺特点,对冲小孔凸模全长导向,卸料板上装有导套,通过导柱导向,提高冲小孔的精度.在冲小孔前护套先压紧材料,由于护套与材料接触面积小,压力集中在小孔周围,使材料处于三向受压状态,冲出的孔边缘无毛刺,表面光洁.通过对其小孔L冲裁特点的总结、分析,阐述了小孔冲压模具的设计原理.     

基于Pro/E的冲压复合模具设计

以变压器硅钢片为例,针对冲裁件孔多,形状复杂的特点,阐述了采用复合模冲裁的必要性。介绍了在Pro/E环境下进行复合模设计的流程,指出运用CAD技术可以保证复合模设计精度,并且极大地提高设计效率。实现了快速设计的现代设计理念。     

钢带缠绕预应力模具实验研究

介绍了自主研制的钢带缠绕预应力模具实验装置结构与工作原理,通过标定实验,获得了输出电压与缠绕张力的关系曲线。以厚壁筒类钢带缠绕预应力模具为对象开展缠绕实验研究,解决了缠绕起头与收尾时钢带的粘接等问题,成功缠绕出钢带缠绕预应力模具。通过测量模具内径尺寸的变化量,计算出径向预紧力数值,并与传统年轮式预应力模具比较,验证了钢带缠绕预应力模具所具有的技术优势。     

基于Pro/E的计算机硬盘托架的冲压模具设计

简要介绍在Pro/E软件平台下进行计算机硬盘托架的冲压模具设计的技术路线.根据计算机硬盘托架的结构特点,提出冲压模具设计工艺;通过应用Pro/E的装配设计技术,大大提高了复合模和弯曲模的设计效率和设计的精确度.设计结果数据为模具的数控加工制造提供了基础.     

冲模CAD系统中的数据库访问技术研究

介绍数据库访问技术在冲模CAD系统开发中的应用.用动态链接库来实现SolidWorks和数据库之间的通信,以Visual C++为前台开发工具,Access为后台数据库,通过具体实例介绍了采用DAO和ADO两种技术访问数据库应用程序的关键技术.     

钢带缠绕预应力模具的疲劳设计方法

基于拉美公式、欧拉公式和疲劳设计理论,开展钢带缠绕预应力模具的疲劳设计研究,确定出合理的缠绕预紧力、缠绕层数和缠绕张力.分析工艺参数对疲劳设计果的影响规律,发现缠绕预应力随模具负载增加呈线性增加,预应力值增加的速度随着缠绕层数的增加逐渐变小;增加许用安全系数将导致预应力和缠绕层数增加;摩擦系数越小所需的钢带层数越少;钢带越厚缠绕层数越少.     

设计冲压模时如何对工艺方案进行优选

选择冲压工艺方案是模具设计中非常重要的环节,本文根据冲压变形机理,结合生产实例,阐述了如何对可能的工艺方案进行比较分析,明确表达了最佳方案的确定方法。     

一种冲裁级进模冲压力及压力中心的自动计算方法

针对冲裁级进模冲压力及压力中心计算效率低、容易出错的问题,运用VBA技术对Auto CAD软件进行了二次开发,实现了任意复杂形状冲裁刃口的冲压力及压力中心的自动计算,显著提高了级进模的设计效率。     

基于AutoCAD 2002的冲模标准件设计系统

介绍了在AutoCAD2002平台下,利用Visual LISP为工具进行开发冲模标准件库的方法,实现对其的参数化设计。     

冲裁工艺及冲模失效分析

介绍了板料冲裁加工的工艺特点,分析了冲模失效的原因,并提出提高冲裁件质量和模具寿命的工艺措施。     

基于UG的波形弹簧冲压模具数控加工

本文针对波形弹簧的大规模生产需求,结合UG在复杂曲面造型与数控加工方面的优势,采用双三次B样条曲面造型方法,建立了波形弹簧生产所需的冲压模具几何模型,并从加工工艺角度,对模具数控加工中的关键问题展开分析,实现了最优小刀具半径的选择、刀具路径合理规划以及粗精加工参数设置.应用结果表明:加工出的模具表面形状精度符合设计要求,能够实现波形弹簧的精密冲压.     

Determination of blank shapes for drawing irregular cups using an electrical analogue method

An electrical analogue method is introduced to determine optimum blank shapes for deep-drawing cups of irregular cross-section. Square and rectangular cups were drawn from aluminium and steel blanks having these shapes and required very little trimming. Comparison is made with other methods of developing blanks and although one empirical method gave reasonable results for rectangular cups it is concluded that the electrical analogue method is preferred; it is also applicable to irregularly shaped cups.     

A knowledge-based blackboard framework for stamping process planning in progressive die design

It is widely accepted that stamping process planning for the strip layout is a key task in progressive die design. However, stamping process planning is more of an art rather than a science. This is in spite of recent advances in the field of artificial intelligence, which have achieved a lot of success in incorporating built-in intelligence and applying diverse knowledge to solving this kind of problem. The main difficulty is that existing knowledge-based expert systems for stamping process planning lack a proper architecture for organizing heterogeneous knowledge sources (KSs) in a cooperative decision making environment. This paper presents a knowledge-based blackboard framework for stamping process planning. The proposed approach speeds up the progressive die design process by automating the strip layout design. An example is included to show the effectiveness of the proposed approach.     

湿式制动驱动桥壳冲压模具设计

湿式制动驱动桥因具有制动冲击小,操作舒适,受工况、路况影响小等优点,被国际先进重型车辆制造厂广泛采用。桥壳作为车桥的主要承力件,其性能直接影响到车桥的整体特性。为提高桥壳的承载性能及疲劳强度,在制作冲焊式桥壳时,半壳体采用冷冲成形。通过对桥壳半壳体冲压成型过程分析,设计制造了一套组合式模具,成功的解决了该半壳体的冲压。采用该模具冲压后的半壳体完全能满足设计要求。该模具与传统的整体式模具相比,增强了模具互换性和实用性。对于不同型号的桥壳半壳体,只需要更换模具的工作部分即可,大大降低了桥壳类模具的成本。