250摩托车变档轮挤压工艺与模具

介绍了250摩托车变档轮挤压工艺与模具,该模具结构具有节省贵重模具材料、易于加工、更换方便的特点,可供类似挤压模设计参考.     

Morphology of single inhalable particle in the air polluted city of Shijiazhuang, China

In the typical air polluted city of Shijiazhuang,single inhalable particle samples in non-heating period,heating pened,dust storm days,and snowy days were collected and detected by SEM/EDS(scanning electron microscopy and energy dispersive X-ray spectrometry).The particle morphology was characterized by the 6 shape clusters,which areirregular square,agglomerate,sphere,floccule,column or stick,and unknown,by quantitative order.The irregular square particles are common in all kinds of samples;sphere particles are more,and column or stick are less in winter samples;in the wet deposit samples,agglomerate and floccule particles are not found.The surface of most particles is coarse with fractal edge,which can provide suitable chemical reaction bed in the polluted atmospheric environment.New formed calcium crystal is found to demonstrate the existence of neutralized reaction,explaining the reason for the high SO2 emission and low acid rain frequency in Shijiazhuang.The three sorts of surface patterns of spheres are smooth,semi-smooth,and coarse,corresponding to the element of Si-dominant,Si-Al-dominant,and Fe-dominant.The soot particle is present as floccule with average size around 10 μm,considerably larger than the former reported results,but wrapped or captured with other fine particles to make its appearance unique and enhance its toxicity potentially.The new formed calcium crystal,the 3 sorts of sphere surface patterns,and the unique soot appearance represent the single inhalable particle's morphology characteristics in Shijiazhuang City.     

RF内星轮(闭式)精密温锻工艺

叙述了RF内星轮塑性变形的工艺分析,提出了RF内星轮制造的(闭式)精密温锻工艺,阐明了新技术取代旧工艺的优点.     

镶块锻模的可塑性设计

简要地介绍了镶块锻模结构特点和可塑性优化设计的难点,着重介绍扩大其使用性能可塑性设计方法的要点.     

铝型材挤压平模CAD系统的开发

介绍了铝型材挤压平模CAD系统的总体结构和设计要素.该系统以AUTOCAD12.0为图形支撑环境,VISUAL BASIC4.0 FOR WINDOWS作为开发工具,采用交互式设计,完成了从型材图形输入到模具图纸输出的全过程.利用该系统可以进行挤压平模设计的各项计算,通过优化选择,设计出尺寸精确、结构合理的模具.     

AutoCAD环境下的参数化智能冲裁模——CAD系统的开发研究

介绍了利用AutoCAD提供的ADS开发工具,采用参数化绘图,将人工智能技术引入模具CAD系统,开发参数化智能冲裁模CAD系统的过程。     

冷挤压三层组合凹模的优化设计

应用厚壁圆筒的弹性解 ,分析了冷挤压三层组合凹模具有最大弹性极限时的优化设计 ,推导了三层组合凹模的最大承压、各层分界面半径和分界面过盈量的优化设计计算公式。利用所推导的计算公式 ,可实现三层组合凹模几何参数的最佳设计     

雾化器电子盒模具设计

介绍了雾化器电子盒复合模具的设计,并对其工作过程和成形做了较详细的阐述。     

提高铝合金压铸模使用寿命的探讨

对影响铝合金压铸模使用寿命的诸多因素 ,如压铸件结构、形状、模具设计、模具材料及加工工艺、模具的正确使用和管理等方面进行了分析和总结 ,阐述了热处理方法对铝合金压铸模使用寿命的重要性 ,探索出了提高模具质量、延长模具使用寿命的途径。     

冲模压力中心的快速确定

说明了基于VB6.0的冲模压力中心的开发过程 ;实现了冲模压力中心的快速、准确定位 ,即确定冲模压力中心与已知任意两点之间的距离