锤锻模型槽布置与模块尺寸确定CAD

介绍了锤锻模型槽布置和模块尺寸确定的计算机辅助设计方法,以平衡重锻件为例,给出了计算机辅助设计的结果。     

DIE‐OFF OF PATHOGENIC E. COLI O157:H7 IN SEWAGE CONTAMINATED WATERS1

E. coli O157:H7 is a pathogen that can be present in sewage contaminated waters. This organism poses a health risk for humans who come in contact with these waters via drinking, swimming, or shellfish consumption. A risk assessment model is needed to evaluate or quantify this risk. One possibility is the use of a computer model to simulate the fate and transport of E. coli O157:H7 downstream from a discharge point [e.g., a separate sanitary sewer overflow (SSO)]. However, this computer model would require input data regarding characteristics of this organism, which have not been previously available. One necessary input parameter is the rate at which die off of this organism occurs in a stream or river environment. Several studies were conducted to evaluate the die‐off rate of E. coli O157:H7 in an SSO impacted stream. Indicator bacteria (total coliforms, E. coli, and enterococci) were evaluated simultaneously. The results suggest that E. coli O157:H7 is not persistent — decay rates are high relative to the indicator bacteria. However, the decay plots suggest a biphasic response: initial decay is rapid, followed by an attenuated, slower decay. Hence traditional simulation methods using a single, first‐order decay rate may be inaccurate.     

摆动辗压模具的材料选择

分析了摆辗模具的工作原理、失效形式 ,合理地选择材料及制定热处理工艺 ,可以大大提高模具寿命     

整流器成形工艺和模具设计

球形件成形中最困难的问题是口部起皱和底部破裂 ,通过制订合理的成形工艺 ,将变形量分解和降低到最小程度 ,巧妙地解决了球形件成形中的难题。     

内接头锻件成形工艺分析与模具设计

提出了采用预成形和正反挤成形生产内接头新工艺 ,通过有限元模拟和分析确定了合理的预制坯形状和尺寸 ,设计了内接头预成形和正反挤成形模具。     

阶梯件拉伸挤压复合模设计

通过分析零件的工艺特点 ,设计了拉伸挤压复合模 ,不仅可提高零件质量 ,而且可提高生产效率。     

摩托车棘轮起动齿轮冷挤压齿工艺及模具设计

摩托车的棘轮、起动齿轮是起动器的重要组成部分,其制造精度高,工艺复杂。此文从工艺性分析、坯料选择、设备选型等方面阐述了两齿轮冷挤压齿成形工艺,对冷挤压模具结构、齿模设计补尝作了详细介绍。     

端头多半圆弯曲工艺改进与模具设计

端头多半圆弯曲件比较常见,但质量难以保证。此文通过对成形弯曲工艺的分析,提出了改进措施,并介绍了两种典型模具结构,及其零部件的设计。     

曲壁薄管的滚压成形工艺及模具

在现代的生产、生活中 ,板金零件的应用越来越广泛 ,零件的形状更具特色 ,而零件的成形工艺则越来越多样化。以仿古铜鼓为例 ,介绍了曲壁管在车床上滚压成形的工艺技术及其模具结构 ,并分析了工艺特点和应用中应注意的问题     

用CAXA电子图板和AutoCAD2000设计电刷端盖压铸模

主要介绍了CAXA电子图板和AutoCAD2 0 0 0在电刷端盖压铸模设计中的使用方法 ,论述了电刷端盖压铸模设计中涉及的压铸机选择 ,分型面选择和浇注系统的设计等技术问题。