【摘 要】
：
In this paper,the rapid and integrated manufacture method of 3D printing gun drill is put forward. The 3D printing process test of the composites gun drill composed of medium carbon steel drill shank, low alloy steel drill pipe and tungsten cobalt hard al
论文部分内容阅读
In this paper,the rapid and integrated manufacture method of 3D printing gun drill is put forward. The 3D printing process test of the composites gun drill composed of medium carbon steel drill shank, low alloy steel drill pipe and tungsten cobalt hard alloy drill bit is conducted. Microstructure and morphology of the composites gun drill interface between low alloy steel and tungsten cobalt hard alloy is analyzed using SEM. Element distribution and Phase composition of the interface between low alloy steel and tungsten cobalt hard alloy were tested and analyzed by EDS and XRD respectively. The oxidation resistance, micro hardness and corrosion resistance of the interface between low alloy steel and tungsten cobalt hard alloy were analyzed.The results show that the interface performance of 3D printing compos-ite gun drill is better than that of the welding gun drill. The rapid and integrated 3D printing method is feasible for gun drill manufacture.
其他文献
无人船视觉图像受波浪和倒影的影响,水面区域颜色和纹理复杂多变,增加了无人船的视觉感知难度.不同于传统方法处理整个图像,本文研究主要围绕特征相对稳定的天空区域检测任务.根据图像的边缘信息,以及水上场景不同区域的饱和度和亮度分布情况,提出一种基于多信息融合的天空检测算法.首先,为了去除噪声和局部纹理,保留图像不同区域的结构信息,提高算法中区域分割效果,采用变分法对图像进行预处理.然后采用基于图的视觉分割算法,利用边界信息将图像分割成不同区域.其次,对水上视觉场景进行分析,利用在HSV颜色空间下不同区域在图像上
随着市场经济的迅速发展及科技水平的不断提升,化工行业蓬勃发展.当前社会对化工行业的要求越来越高,相关企业只有加强对生产装备及其应用技术的研究分析,才能保障生产效率和质量的提升.文章简要分析了化纤机械装备技术的发展现状及趋势.
基于轨迹数据的船舶行为高效辨识对于耙吸式挖泥船施工效率优化具有重要意义.耙吸式挖泥船往返施工作业,行为模式改变频繁,轨迹路径密集,行为辨识存在较大困难.针对耙吸式挖泥船AIS(Automatic Identifica-tion System)航行状态数据缺失问题,提出一种无监督船舶行为辨识方法.该方法采用DBSCAN(Density-Based Spa-titcal Clustering of Applications with Noise)原理,以平均航速代替密度阈值定义核心点,根据行为特征划分阈值区间
认知安全风险是构建基于船岸协同的船舶智能航行系统的前提条件.基于船岸协同关系研究结论,根据船舶智能航行系统技术特点和“智飞”号智能航行测试结果,研究构建了船舶智能航行风险演化概念模型及其数学表达模型,分析了无人化趋向、基于航行场景和连锁效应下的风险演化一般规律及其特征,为船舶智能航行风险认知和管控、政府治理以及基于船岸协同的船舶智能航行系统的构建提供参考.
基于长江经济带2010～2018年相关数据,运用GeoDa软件与Stata软件进行分析,探究水运对经济发展的影响.利用熵值法确权后得出水运发展指数,将其作为解释变量进行计算空间效应.研究结果表明:长江经济带地区经济发展呈现显著的空间正相关,90.9％的地区呈现高高聚集或低低聚集;水运对地区经济增长存在正的空间效应,对于长江经济带内部某一地区而言,长江经济带整个区域的水运发展指数每增加1％,该地区的人均GDP增加0.577％;某一地区的经济发展不仅受自身水运发展水平的影响,也受长江经济带内部其他地区的影响,
为了厘清船舶智能航行状态下的船岸、船船协同关系,梳理了船舶航行的23项活动、行为及其相关方.结合实例分析了船舶智能航行各种驾驶模式及其转换与发展趋势,简要介绍了遥控驾驶和自主驾驶模式下的船船协同、船舶与岸端机构的信息交互和协同,为提高智能航行信息交互效率,认识智能航行的船船、船岸协同关系和构建基于船岸协同的智能航行与控制系统提供技术理论支撑.
2021年12月25日,2022年全国海事工作会议在京召开.会议采用电视电话形式召开.交通运输部党组成员、副部长赵冲久出席会议并讲话,部海事局党组书记、局长曹德胜作工作报告.
To investigate the influence of temperature field of friction stir welding (FSW) 2219 aluminum alloy thick plate, and to achieve effective prediction of temperature field, the authors establish a three-dimensional numerical simulation model of FSW 18 mm t
The effect of the shielding gas composition and the cathode processing history on the weld formation quality during welding with a non-consumable electrode at high current was studied. The major reasons for pores,“waists”and undercuts formation during wel
Owingto diamond excellent physical and chemical properties, so synthetic diamond abrasives are extensively used in manufac-turing diamond tools are utilized in machining hard and brittle materials. The brazing technology is exploited with strong bonding f