弹箭战斗部分步压装工艺技术先进性分析

分步压装工艺是一种先进的装药技术,能够装填高能炸药,装药平均密度可达到1．70g／cm^3。该技术综合了螺旋装药与油压机压装的优点,并广泛应用于大口径榴弹系列产品、火箭弹、导弹等战斗部装药。分步压装药与传统的油压机压力装药相比,具有压药过程安全、高效,相对密度高且密度均匀,具备柔性制造能力,应用广泛等先进性。分步压装药技术填补了国内弹药生产中该领域的空白,满足了我国高能固态炸药连续装药需要,实现了我国弹箭装药生产的低成本、高效率。     

汽车发动机缸盖单向阀压床的设计与研制

单向阀压床是汽车发动机缸盖装配生产线上的一台全自动专机设备。介绍了汽车发动机缸盖单向阀压床的工作原理、结构组成以及主要技术特点。该设备具备自动上料、防反检测、料反报警、高低压自动切换、压装报错等功能,解决了以往单向阀压装中出现的错压、漏压、过压等问题,满足了汽车发动机缸盖装配线高效、安全、可靠的生产需求。     

分步压装高能炸药质量控制研究

为适应未来地面压制武器装备的需要,提高常规弹药威力和毁伤效能,对分步压装高能炸药技术进行研究。主要介绍了引进的自动分步压装机国产化后的装药原理,通过对影响分步压装药的高能炸药性能、环境、设备调试、工艺过程设计等因素的分析,并以典型产品的分步压装高能炸药为载体进行验证应用,优化了工艺参数,实现了分步压装高能炸药技术国产化。结果表明,人机料法环的质量控制方法能解决分步压装高能炸药的关键技术问题,有利于提高装药密度,有效消除或减少装药缺陷,提高了炮弹综合威力,促进了地面压制武器装备的发展。     

卧式蒙套自动压装系统的设计

在微电机行业,转子涂敷前需要进行蒙套压装以保证涂敷的尺寸。通过对压装系统整体、动作流程的规划、夹具、伺服压装机构等模块的设计,使压装系统占地小、运行稳定。卧式蒙套压装自动系统在保证压装尺寸的前提下,提高了生产效率,为电机生产线的升级改造及全自动生产线的推广起到促进作用。     

减装药试验膛压异常原因的分析及解决措施

本文以某产品减变装药膛压异常的试验结果为例,从多个方面分析和探讨了在大口径、高膛压火炮上,采用无中心传火的发射装药结构中,因粒状发射药药床通透性不好,而造成膛压、初速严重超标,药筒严重烧蚀,甚至膛炸的原因,并寻求了相应的解决办法,取得良好效果。     

基于自动化装配的缸盖气门导管压装机设计

针对气门导管手动压装方式,存在操作者劳动强度大、安全隐患多,压装质量和效率受人为因素影响大,质量保证能力有限,无法满足大批量生产任务需求的问题,介绍了一种进、排气门导管实现自动压装的设计方案。方案占地空间小,满足原有生产线工艺布局,实现生产线的省人化、自动化。该方案技术含量高、实现效果好,标志着气缸盖生产线装备技术研究与工艺优化改进的新突破。经使用证明,满足柴油机的性能要求,并取得了良好的社会效益和经济效益。     

某装药技术集成与工程化示范设备研究

通过隔栅式熔化技术、真空搅拌去气泡技术、产品倾斜引流注装技术和低比压顺序凝固装药技术的集成和工程化研究,建立了适用于多种产品柔性注装工艺的工程化示范设备。该设备采用格栅式熔化技术,在保证熔化过程本质安全度和质量的基础上,使熔化效率提高1.8倍以上;采用真空搅拌去气泡技术,有效降低了药剂中混杂的气泡,提高了装药质量;采用产品倾斜引流注装技术,消除了注装过程中气泡的产生和混入;采用低比压顺序凝固注装技术,通过控制热空气温度场、冷却水温和产品入水速度等工艺参数,消除了凝固过程中产生的底隙、裂纹及热应力等。该设备总体设计满足精密注装质量要求,相对密度达到了≥98%,局部密度差≤0.2%,熔化效率260kg/2h。     

装曳光管联动机

高炮榴弹装曳光管,曳光室收口,检测等工序,采用自动收口联动机,减轻了劳动强度,节约了劳力,保证了产品质量和生产安全。联动机的收口工序,主要由步进式弹体输送机构和冲床来完成的。收口前,先分别完成卸防潮盖及安装曳光管等工序。该机采用射流控制,射流信号输入控制箱,经过逻辑元件,     

全自动轮对压装线的研制

介绍了全自动轮对组装生产线的工艺流程、生产设备组成、主要结构及优点。着重阐述了机械设计、控制系统、数据管理系统在全自动轮对压装线上的创新应用。     

基于柔性制造理论火工品小群模自动装配生产线的实现

针对目前国内火工品生产厂家在火工品装配过程中,存在生产线专用性强,生产线和产品生产都是一对一的方式,造成了生产线利用率低下,场地占用率高、同时当产品改进或淘汰后,生产线再利用较难,不适应现阶段武器装备制造多品种、小批量的生产模式等生产现状的问题。进行分析论证、总结出了一种可以实现多种火工品生产柔性化装配生产线。该生产线通过工装模具快速更换、装药精度、压药压力快速调整以及设备布局快速切换等方法来实现多品种、小批量的火工品自动化装配生产线,填补了国内空白,提高了我国火工品的装药装配水平。     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...     

分布动态载荷识别的抗噪处理

针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。     

The laboratory simulation of abrasive wear

Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.     

ANGULAR DISTORTION ALLOWABLE VALUE AND ASSESS METHOD OF WELD ON COKE TOWER

A graph as the new engineering method for estimate the safety of bulging deformation of coke tower is proposed. Through stresses analysis of circumferential weld of coke tower and comparing the stresses produced by pressure with heat stress of steady state, residual stress, bending stress produced by both itself weight and wind loads, it showed that the stresses produced by pressure on the angle distortion are the main factor of equivalent stress of the combined stress. After comparing four kinds of stress controlling conditions, the relation to stress with depth of angular distortion, grade of curvature of angular distortion and half of region of angular distortion has been inferred. Graph of deformation allowable value of coke tower for different condition by angular distortion and half of region of angular distortion has been plotted. The five steps for its engineering use have been explained. The lighter the grade of curvature is, the larger of bulge allowance, may be, and the bigger of depth of angular distortion may pose too. For the coke tower with a popular structure of Dg 5 400 mm×28 mm, the result by graph is nearly more than the result of two formulas formed by other research, the error is less than 7.0%. But, the graph can be easily applied to different size of angular distortion.