轿车结构零件多工步成形优化设计

针对重型汽车挡泥板成形过程中拉延不足的问题,运用数值模拟技术对其成形工艺过程进行分析,根据分析结果,进行工艺优化和模拟验证,得到优化的工艺补充面以及合理的拉延筋高度及分布参数：工艺补充面在宽度和长度方向上补充线长增加到200 mm;过渡圆角加大到150 mm;在拉延筋设置高度中,较浅拉延筋是2.5 mm,较深拉延筋是4 mm。试模结果表明,其有效地解决了制件成形过程拉延不充分的问题,保证了产品质量;对该类零件模具工艺设计具有参考意义。     

JSTAMP/NV冲压仿真模板定制功能详解

针对工程师缺乏有限元知识成为许多厂家成功应用冲压CAE软件的障碍的问题,以汽车翼子板为例,详细介绍JSTAMP/NV的冲压仿真模板定制功能.该功能使工程师在缺乏有限元知识的情况下能成熟应用冲压仿真技术.     

汽车翼子板成形典型案例分析

汽车外形更新换代快.为了满足车身翼子板外表面流线化、艺术化和个性化,汽车翼子板造型变化多样,汽车翼子板容易出现制件叠料、开裂、少料和局部强度差等工艺问题,对这些问题的产生原因进行了分析并提出了解决措施,提高了模具设计和制造的效率.     

膨胀岩土深路堑改明洞施工方案设计

结合东北某工程膨胀土深路堑边坡垮塌实例,分析了造成边坡垮塌的原因,提出上部采用边坡防护,下部采用明洞加围护桩相结合的处理方案,并对处理方案进行对比,优化防护设计,通过现场实际测量的数据表明:对于东北膨胀性土、地质围岩较差的情况,围护桩加明洞方案的可行性。     

马鞍池大厦基坑支护工程的施工

以温州马鞍池大厦基坑支护工程为例，对其施工要点作了阐述，详细介绍了具体的施工流程，并提出一些加固措施，从而确保基坑支护工程的合理、安全。     

Development of a Fuzzy Rule‐based Decision‐making System for Evaluating the Lifetime of a Rubber Fender

If a rubber fender, whose purpose is to absorb the shock energy that is generated when a ship is berthing, fails because of deterioration and vulcanization, the ship and the pier structure may incur serious damage. In this paper, we introduce a fuzzy rule‐based decision‐making system to predict the maintenance timing of rubber fenders by diagnosing their faults and evaluating their lifetimes on the basis of the knowledge and experience of experts. First, we built a case library containing information concerning fender lifetimes and points in these lifetimes when faults occurred. This was gathered on the basis of the results of testing the lifetime of rubber materials under accelerated conditions and a knowledge base of the physical properties of fenders in order to evaluate the deterioration in a rubber fender. Moreover, after representing the key factors affecting the deterioration of rubber fenders as a fuzzy cognitive map that reflects the knowledge and experience of domain experts, we drew inferences regarding the heuristic factors of the lifetime of rubber, the conceptual centrality of which is relatively high according to the cause‐and‐effect relationship between key factors. Finally, we propose a diagnostic process for the performance deterioration of rubber fenders based on the various factors that affect the lifetime of rubber and its multiple physical properties in the form of a decision‐making tree. We then applied it to rule‐based and case‐based reasoning. Copyright © 2014 John Wiley & Sons, Ltd.     

软土基坑支护的若干关键问题

根据大量的基坑工程实践,从支挡的必要性、支护形式、围护桩距、构件设计及阻水截渗五个方面对基坑支护进行了总结性的阐述,介绍了各种支护形式的优缺点,为正确选用深厚软土层中基坑支护提供了参考依据。     

翼子板侧整形结构分析

通过对翼子板制件的特点分析,介绍了翼子板侧整形处的工艺分析以及结构设计时的注意事项,同时在制造过程中对模具结构进行优化,重点对结构设计、制造优化过程进行了阐述。     

汽车翼子板表面缺陷控制探讨

介绍汽车翼子板表面缺陷检测及评估方法,分析常见的表面缺陷及产生的原因,预防表面缺陷产生应采取的措施,为翼子板表面质量的提升以及冲模调试提供借鉴和参考。     

汽车挡泥板复合冲压模具设计

对汽车挡泥板进行冲裁工艺分析并确定冲裁方案,说明了模具主要零部件的设计和选用。以UG为平台,利用三维参数化设计与建模技术,对汽车挡泥板的冲压模具进行三维参数化造型设计,可以根据需要改变模具的尺寸;进行虚拟装配,可以直观地观察和分析模具的结构以及零件的相互位置关系;加快了产品开发速度,提高了产品开发效率,缩短了产品开发周期。