色织涤棉细密平纹织物的生产实践

通过对涤棉色织细纺、府绸等织物的特点及风格介绍,说明了涤棉细密平纹织物的产品规格设计及生产工艺要求、后整理的工艺流程以及工艺条件。重点叙述了生产工艺的配置和要点,以及工艺配置不良对织物风格和手感的影响。     

油罐底部边缘板的腐蚀与防护

根据油罐的运动变形及对其底部边缘板的腐蚀原因分析,介绍了一种有效的技术,即采用一种具有高性能的防水涂料和设计可循的防腐蚀施工方案,从而满足油罐底部边缘板的防护要求。     

Comparison of surface roughness quality obtained by high speed CNC trimming and high speed robotic trimming for CFRP laminate

This paper proposes an experimental approach for evaluating the surface roughness of the CFRP parts produced by high speed CNC trimming and high speed robotic trimming under various cutting conditions. A comparison is made between the surface roughnesses obtained by the two processes. The results obtained show that, the measured profiles obtained from high speed robotic trimming are dominated by a large trajectory deviation, as compared to machine tool trimming results. After the trajectory deviation effect is discounted, the results show that for the +45° ply orientation, the surface quality obtained through high speed robotic trimming is similar to what is obtained with the CNC machine. Furthermore, a significant relationship was observed between the surface quality and the ply orientation, whatever the machining process and the cutting conditions employed. The −45° ply orientation represents the worst case in terms of surface roughness, whatever the machining process. It is 4 times higher compared with that of +45° ply orientations,The results also show that the effect of cutting conditions on surface quality is significant for both machining processes tested.     

Developments in the non-traditional machining of particle reinforced metal matrix composites

The non-traditional machining of particulate reinforced metal matrix composites is relatively new. However, researchers seem to pay more attention in this field recently as the traditional machining of particulate reinforced metal matrix composites is very complex. This research investigates different non-traditional machining, such as electro-discharge, laser beam, abrasive water jet, electro-chemical and electro-chemical discharge machining of this composite materials. The machining mechanism, material removal rate/machining speed and surface finish have been analysed for every machining process. This analysis clearly shows that vaporisation, melting, chemical dissolution and mechanical erosion are the main material removal mechanisms during non-traditional machining. The thermal degradation and the presence of reinforcement particles mainly damage the machined surface. The understanding of electro-discharge, laser beam and abrasive water jet machining is more developed than that of electro-chemical and electro-chemical discharge machining for particulate reinforced MMC.     

红外热像法检测外墙饰面空鼓缺陷时结果的可靠性

本文研究热像仪设备、检测人员、天气环境、拍摄距离、拍摄倾角、缺陷程度等主要参数的改变,对检测质量可靠性的影响.利用实例采集的检测数据,进行检测结果比对,分析红外热像法检测外墙饰面空鼓缺陷时质量的可靠性.根据统计结果归纳出提高检测结果可靠性的方法结论.     

防水卷材在屋面工程中的设计与应用

对现今屋面防水卷材的种类与特点作出了归纳和分析，对卷材屋面防水设计应用提出了注意事项。     

预精焊螺旋焊管精焊机组焊缝跟踪方式研究

两步法预精焊生产是螺旋埋弧焊管生产的一个重要发展方向,而焊缝自动跟踪是精焊机组自动控制系统的一个重要组成部分。通过对跟踪系统跟踪原理的分析与焊缝跟踪驱动方式的介绍,说明了精焊机组焊缝跟踪的实现原理。最后,介绍了一种内焊跟踪外置的跟踪方式,并对其优缺点进行了简单的分析。     

Differential finishing of freeform surfaces (knee joint) using R-MRAFF process and negative replica of workpiece as a fixture

It is difficult and challenging to achieve uniform nanoscale surface finish in the contact zone, particularly on freeform (or sculptured) surfaces having different curvatures at different locations. Femoral (or, Knee joint component) is one of such biomedical freeform component which has complex profile along its curvature. Surface conditions of a femoral decide the life of the implant and they play a crucial role in its functionality. The variation in surface roughness of the femoral should be minimum in the contact zone. For this purpose, a special tooling is being proposed for rotational magnetorheological abrasive flow finishing (R-MRAFF) process. A negative replica of the workpiece (knee joint) as a tool (or a fixture) is used so that the medium flow velocity in the fluid flow channel is almost constant (or minimum possible variations) along the medium flow direction. It is able to do differential finishing also along the curvature. In addition, pulsating magnetic field has been used to generate vibrations in the medium in the finishing zone so that the possibility of fresh abrasive particles interacting with the surface of femoral is high. The surface finish has been achieved ranging from 26 nm to 62 nm using the proposed finishing technique and negative replica of the workpiece (femoral) as a fixture.     

高速涡流纺专用涤纶短纤的开发与应用

对近几年涡流纺在中国的快速发展做了概述,简要说明了涡流纺机台特点及纱线特征,重点阐述了涡流纺纱专用涤纶短纤强度与油剂性能对纺纱品质与生产效率的影响,指出未来几年,涡流纺专用涤纶短纤在品质、品种、规格及市场需求量上将具有可持续发展的潜力。