Study on manufacturing information sharing and tracking for extended enterprises

To solve manufacturing information sharing and tracking problems, three key issues are discussed. Firstly, templates are used to host manufacturing information, though they differ in their content and capacity. Secondly, the manufacturing information sharing and controlling method (MISCM) locates every information item at a discrete point on the manufacturing information plane according to its invisibility and unusability. And each user has several various privilege areas in the plane. According to the mapping relationship between the information set and the discrete point set, every user is entitled to access some information items. A template that contains these privileges is activated. Thirdly, when the manufacturing process is in progress, templates are instantiated. Then, a time-dependent instantiated template net (TIT-net) emerges. Based on its searching algorithm, information tracking is achieved through the history view and the in-time view. Finally, some examples show how these issues work together to implement a fluent, controllable and dynamic manufacturing information tracking mechanism.     

Investigation on delamination morphology during drilling composite laminates

Drilling-induced delamination of composite materials is a key factor that affects the quality of subsequent machining. To investigate the developing process of delamination, experiments with different drilling depth are conducted. In order to observe the delamination of different cross-sections in radial direction of the hole, the grinding method is adopted. Three-dimensional morphology of delamination at the exit of hole is obtained. The regularity of delamination with the change of drilling depth is analyzed, and the existence of “hidden delamination zone” is obtained finally. Due to the rebound effect of hole diameter and the inverted cone of drill guide section, the “hidden delamination zone” will be generated under the condition that the edge of delamination area is compressed tightly again. The critical thrust force of delamination is also studied, and it is proved to be correct.     

轴向──反向复合加压胀形工艺的上限分析与实验研究

本文对轴向—反向复合加压胀形工艺进行了上限分析，建立了力学模型及滑移模型，导出了上限载荷的理论计算公式，并与实验结果进行了对比，为该工艺在生产中的推广应用提供了有价值的参考。     

扫描式微弧氧化铝合金表面成膜效率分析

利用扫描式微弧氧化方法,以硅酸系溶液作为工作液,成功地在铝合金2024表面制备了"蛇形"和"HIT"图案的陶瓷膜层,一次扫描获得陶瓷膜层厚度为17μm。以实际试验数据为基础,经平均放电电流密度计算,对扫描端的实时成膜效率进行了分析。并以单位时间内加工陶瓷膜层总面积为参照,通过与传统微弧氧化的比较对扫描式微弧氧化的加工能力进行了评价。     

电脉冲处理时间及冷却方式对1Cr18Ni9Ti钢氮碳共渗的影响

用金相显微镜、显微硬度计研究了电脉冲处理时间及冷却方式对1Cr18Ni9Ti钢固体氮碳共渗的影响。结果表明,在550℃保温1 h后进行连续脉冲6 h处理所得的渗层厚度为150μm,但表面产生裂纹甚至剥落。每小时脉冲处理15 min,随炉冷却可得到渗层较深,且渗氮层表面齐整,渗层厚度大于普通工艺中的渗氮层厚度。     

液压缸结构分析的网格自动生成

针对典型液压缸截面特征，给出一种简明的三角形单元网格生成算法。它作为液压缸CAD系统有限元分析前置处理的数学模型之一，可有效提高分析效率。     

铜氨水系中一价铜氨络离子的氧化

微细铜粉是可替代贵金属生产电子浆料的重要原材料。在常压铵盐歧化工艺生产微细铜粉过程中, 制取一价铜氨络离子溶液是关键步骤, 而一价铜氨络离子在空气中极易被氧化。借助Ｃｕ（ Ⅱ）／Ｃｕ（ Ⅰ） 电对氧化还原电位的测定来获知不同时刻一价铜氨络离子的浓度, 研究了一价铜氨络离子的氧化速度及其影响因素。实验表明：溶液温度越低、气相中氧分压愈小、ＮＨ３·Ｈ２Ｏ 浓度越大以及ＮＨ＋４ 的加入均有利于阻缓一价铜氨络离子的氧化。