介绍一种多工位级进模的设计

介绍了一种生产材料薄，尺寸小、尺寸精度要求高的电位器零件的多工位级模设计实例。对该制件的冲压工艺性，经济性，排样方案及模具结构进行了分析。     

基于AMESim的同步柔性冲压装置控制系统仿真分析

冲压件作为一种大批量零部件在机械行业制造中起到非常重要的作用,针对一些特殊零部件的冲压,采用3个同步气液缸来完成对冲压件三边的定心柔性冲压,为了进一步提高冲压装置的冲压精度和柔性化,设计一种串联气液缸与机械刚性连接相结合的控制系统。通过AMESim仿真软件的分析以及实验验证,有效减少了三边同步误差的时间,确保零件冲压时的三边同步误差控制在允许误差范围内,能够冲压多种规格的零部件,具有结构简单、成本低、操作维护简便的特点,实现了零部件三边定心冲压的高精度化,有效减少不合格品的产生,提高了生产效率。     

套管夹套缩口的模具设计及冲压工艺

采用自主设计的模具以冲压工艺一次成型套管夹套缩口,该工艺具有产品尺寸精度高、生产效率高、生产成本低等优点,可满足大批量生产的要求。     

有限元仿真在压电陶瓷粉末模压成型中的应用

介绍了压电陶瓷粉末模压成型的研究现状,以及粉末材料有限元仿真所用的Drucker-Prager-Cap连续模型和屈服准则。基于有限元仿真法,论述了模压过程中摩擦行为、加载行为等工艺参数对成型坯体内部密度、应力分布的影响,并介绍了有限元法在模压改进工艺中的研究进展。     

Thermo-mechanical behavior of the Al–Si alloy coated hot stamping boron steel

Hot tensile tests of boron steels with and without an Al–Si coating were performed using a Gleeble 3500 test system, at temperatures of 700–850 °C and strain rates of 0.01–1/s. The phase and microstructure of the coating in as-coated and press-hardened conditions were observed under scanning electron microscopy (SEM) equipped with energy dispersive X-ray analysis and X-ray diffraction (XRD). Experimental results indicate that the Al–Si coating gave an unignorable influence on the thermo-mechanical properties of the boron steels. The ultimate tensile strength (UTS) of the Al–Si coated boron steel was almost equal to that of the uncoated under the lower strain rate at the same deformation temperature. At a higher strain rate, the UTS value appeared to be lower than that of the uncoated. Moreover, the UTS difference increased with the decreasing deformation temperature. The ductility of the Al–Si coated steel was lower than that of the uncoated under the described test conditions. Following the tensile tests, extensive cracks were visible in the Al–Si coating layer. SEM observation showed that microcracks and voids appeared after austenization, which may act as nucleation sites for the cracks. The cracks first propagated in the direction perpendicular to the coating/substrate interface and were identified as Type I cracks. The propagation was hindered by the substrate when these cracks reached the coating/substrate interface. This occurred because the interfacial bonding strength between the coating and the substrate was lower than the substrate strength. Following this initial failure, the cracks turned to propagate paralleled to the coating/substrate interface. In addition with the shear stress resulting from the substrate yielding, Type II cracks formed. Eventually, the cracked coatings were accompanied by interface decohesion from the substrate. The width and density of the cracks were found to increase with the decreasing deformation temperature and rising stain rate.     

一种基于计算机的冲模设计及生产经济性评价模型

在传统冲压模具设计基本过程和冲模特点的基础上,构建了冲模计算机自动优化设计及生产经济性评价模型并对其具体实现方法的可行性与可靠性进行论述。冲模设计在优化目标函数的约束下进行,可提高设计质量和效率的同时考虑制件生产成本对其设计的影响。为企业提供快捷有效的技术平台和管理决策保障。     

盖板级进模设计制造

分析了盖板零件的冲压成形工艺,介绍了零件排样设计方案,阐述了模具结构及其主要零件的设计和制造工艺。实践证明,该模具结构设计合理,后期维护方便。     

冲裁间隙与速度对冲裁件质量影响的实验研究

针对厚度为0.23mm的铜合金材料,从冲裁间隙和冲裁速度两个因素分析了冲裁件的断面质量,讨论了不同情况下两种因素对于毛刺的影响,并给出了抑制毛刺产生和提高断面质量的建议。     

钣金冲压仿真软件JSTAMP/NV的最新进展

介绍了JSTAMP/NV最新进展,包括支持使用实体单元进行拉伸仿真分析、吉田-上森模型材料数据库、高级修边有限元网格、增强的回弹补偿功能、便于应用的再计算功能、三维后处理结果加速浏览器和热成形仿真功能。     

检测套冲压工艺及模具设计

依据检测套的工艺计算结果,为提高企业生产效益,对零件的各冲压工序进行了有效的复合,制订了相应的冲压工艺方案,设计了实用的模具结构。生产实践表明:该工艺方案及模具设计能保证零件形状及精度要求,企业效益得到进一步提高。