Water jet forming of steel beverage cans

This paper describes the process of shaping fully formed beer and beverage cans with a rotating high-pressure water jet. This is a special variant of incremental forming and enables much larger strains in the product than would be expected from tensile tests. The paper presents experimental results describing the effect of various machine and material parameters. A possible mechanism that explains the observations is presented.     

Structural evolution of spray-formed Al-70wt.%Si alloys during isothermal holding in the semi-solid state

1 Introduction The study on semi-solid behavior of metals and alloys was pioneered by Spencor and his co-workers at MIT in 1971 [1]. Since then the semi-solid proc- essing (SSP) has been widely studied and used as forming process compared with other methods [2-3]. The materials under the semi-solid state are de- formed much more easily, however they will still maintain the shape and certain strength. SSP can in- crease the part-forming rate, reduce the thermal shock imposed on the mould, i…     

Lubrication for Micro Forming of Ultra Thin Metal Foil

The objective of the present investigation is to establish lubrication technique in micro forming operation. Conventional lubricant, in general, cannot be applied directly to micro forming process, since the lubricant thickness is similar to the dimensions of feature size in micro forming operations. In present investigation, the Octadecyltrichlorosilane (OTS) self-assembled monolayer (SAM) was chosen as a potential lubricant because it sticks to Si wafer die and can be applied to surface with uniform thickness of several nanometer thick. Friction coefficient and adhesion force were measured for OTS SAM coated wafer. It is shown that OTS SAM coated Si wafer offers substantially lower friction and lower adhesion than bare Si wafer. Micro channel wafer die was coated with OTS SAM and channel forming operation with 1μm thick copper foil was carried out. Experimental results show that OTS SAM coated wafer die improves forming characteristic of ultra thin copper foil substantially. These results show that SAM coating can be used as a lubricant in micro forming successfully.     

低阻油藏特征及挖潜方法--以孤东油田为例

根据近几年来孤东油田低阻油藏勘探开发的实例,从沉积特征、封盖条件、运移通道、圈闭类型介绍了低阻油藏的形成条件,通过总结孤东油田低阻油藏的认识经验,建立了类似孤东油田低阻油层的识别标志,从滚动勘探及老井补孔两方面介绍了挖潜方法。同时建议测井技术人员从测井解释方面,运用侧向电阻率测井反演技术、测井曲线高分辨率处理技术,建立一套针对低阻油藏储层的测井评价标准,从而正确评价新井低阻储油层。     

椭圆异型挤压塑性成形映射理论及模腔优化解析

针对金属椭圆异型挤压塑性成形及模腔优化的理论课题,应用复变共形映射数学研究成果,利用奇偶点相互迭代的三角插值法和法线收敛法,将三维金属异型挤压塑性成形问题转化为二维轴对称成形问题,求解异型挤压模腔曲面函数,建立映射函数解析方法,推导椭圆异型材挤压金属塑性成形连续流动场和应变速度场的数学解析式,并应用金属塑性成形能量极值原理,进行异型材挤压模腔参数的优化,同时为精密快速地实现挤压模腔的CAD/CAM一体化目标提供技术支持。     

泌阳凹陷油气成藏组合体及其勘探预测

论述了成藏组合体的概念，提出了油气成藏组合体的划分原则。将泌阳凹陷分为7个油气成藏组合体：双河-赵凹Eh2～Eh3成藏组合体、井楼Eh3成藏组合体、古城Eh3成藏组合体、下二门-廖庄Eh成藏组合体、王集-新庄Eh2-Eh3成藏组合体、付湾Eh3成藏组合体及深凹区白云岩成藏组合体，描述了各成藏组合体的成藏特征．对泌阳凹陷勘探有利区进行了预测。     

喷射成形技术的应用及产业化发展趋势

对喷射成形技术的特点及发展趋势进行了综合评述,分析了如何选择合适的应用对象来确定具体的产品形式及合金体系,并探讨了将其产业化的典型对象.     

压边力在板料冲压成型中的控制研究

压边力的控制研究是板料冲压成型过程中的一个重要内容。首先分析了国内外对压边力的研究现状。然后提出了压边力曲线的预测和压边力的优化控制是压边力研究的两个主要方面，最后提出了采用模糊控制理论对压边力大小和板料的起皱进行跟踪控制，并给出了一个实例。     

W成型孔型精确设计法

介绍了直缝焊管Ｗ成型的设计方法，运用数学方法推导得到精确的孔型参数，Ｗ成型法使带钢在成型过程中的纵向变形及稳定性等方面得到改善。