面向大规模定制的可重构生产线及其关键技术

分析了大规模定制及可重构制造模式的特点,提出了面向大规模定制的可重构生产线.在阐述了面向大规模定制可重构生产线特性的基础上,构建了面向大规模定制可重构生产线的系统集成框架,研究了面向大规模定制可重构生产线设计中的建模及仿真技术、生产线布局与规划技术、生产线物流自动化技术、生产线的可评价体系、可重构机床设计技术、可重构控制器设计技术、生产控制及管理技术、系统诊断技术等关键技术.     

连续式曲轴热处理生产线

根据轴类零件的热处理工艺要求,设计了曲轴悬挂链式连续热处理生产线,阐述了曲轴铸件生产线的热处理工艺,生产线组成和控制方式,对悬挂式连续生产线的工艺流程、加热炉、冷却室、自动化控制等做了介绍。通过现场运行情况可知,该生产线对节约能源、提高生产效率有明显作用。     

机车变压器油箱焊接生产线工艺过程的设计与优化

以某型号机车变压器油箱焊接生产线为研究对象,分析油箱焊接工艺流程,设计油箱焊接生产线的工艺布局,建立油箱焊接生产线仿真模型,以生产线平衡率、设备利用率、生产线产能作为评价指标对焊接生产线的仿真结果进行分析,发现了生产线初始模型存在的瓶颈、堵塞、设备利用率低等问题并提出优化方法对油箱焊接生产线模型进行优化。对比优化前后的仿真结果,证实了优化方法的可行性。     

柔性制造生产线仿真设计与关键数据标定

以基于IRB1410的多机器人柔性制造生产线为研究对象,利用SolidWorks和RobotStudio提出一种虚拟仿真生产线构建方案。简述多机器人柔性制造仿真生产线组成及工艺流程,介绍机器人法兰盘中心点的定义、手部坐标系的标定、工件坐标系的标定,并设计了数控机床的Smart动态组件;在仿真生产线编制了离线程序,根据加速度、轨迹规划,展示了机器人运行情况,运动轨迹仿真结果表明轨迹规划及编程符合预期。实践证明:借助虚拟仿真生产线,有助于实体生产线的设计、优化、调试等,为实体生产线提供理论依据。     

太重生产国内最大的铜挤压机生产线40MN铜挤压机生产线

40MN铜挤压机生产线是目前亚洲最大的铜挤压机生产线，能满足随动针、固定针、浮动针等多种挤压工艺的要求，可生产单重达760kg的挤压制品，有效地提高了后续工序的生产效率及生产线的综合成品率。本文简要介绍了40MN铜挤压机生产线主要技术参数、生产线布置、设备组成及挤压机结构特点。     

HR发动机缸体生产线的工艺规划设计

论文从分析产品特点和对比了不同厂家缸体生产工艺入手,确定了东风日产HR发动机缸体生产线的技术要求,制定了生产线的工艺流程,讨论了缸体生产线的设备选型及加工中采用的新技术,重点介绍了工艺缸盖的应用、托盘输送、二次真空加压含浸工艺,2D码管理技术及水性珩磨液应用技术.生产线建成后使用结果表明:该生产线达到各项设计指标,工艺方案合理、产品质量稳定,生产线物流合理,在制品少、操作人员劳动强度低、运行成本低、经济效益明显.     

工业机器人自动焊接生产线的设计与调试

工业机器人自动焊接生产线的设计合理与否关系到焊接工艺的满足程度。从机器人自动焊接生产线的设计要求出发,详细分析了生产线的控制流程、配置及布局、编程与调试等。并以FOXBOT、A1200机器人组成的自动焊接生产线为例,进行刹车控制、原点校正等现场调试。自动焊接生产线的实践应用,提高了焊接作业效率和质量,具有推广价值。所述设计思路、方法及详细步骤为工业机器人自动焊接生产线的设计调试工作提供了参考依据。     

变批量活塞软重构生产线及其关键技术

文章针对活塞生产模式特点和现有生产线现状,提出了基于变批量生产的活塞软重构生产线.在阐述了变批量活塞软重构生产线特性的基础上,构建了变批量活塞软重构生产线的系统集成框架,提出了变批量活塞软重构生产线设计中的多构性可重构活塞产品设计模型、活塞制造资源优化配置技术、布局规划与优化技术、人因优化技术、建模和仿真等关键技术.     

PLC在液晶模组自动生产线中的应用

针对目前液晶显示器模组生产线自动化生产水平不高和效率低的现状。提出了一种新型的液晶模组生产线的控制方法。对LCD液晶显示器和其模组生产线进行了简单介绍,并将PLC应用于LCD模组自动化生产线上,解决了自动化生产线的控制问题,从而提高了生产线的效率。重点介绍了控制系统的硬件结构和FX2N系列可编程控制器的软件设计,并详细给出了PLC安装接线的输入输出端子对照表、控制系统流程图、顺序功能图以及控制系统的梯形图程序。     

汽车冲压件自动化生产线的设计

为了适应用户的自动化生产需求,使冲压生产线更加智能化、标准化,根据对生产线方案分析,提出一种采用机器人搬运自动化冲压生产线。通过对冲压自动化生产线合理布局规划,描述了每台设备作用及运行原理。并利用工业以太网进行通信,将自动化生产线的自动拆垛、双料检测、视觉对中、上料、搬运、下料等工艺流程之间建立有效的联系,从而满足自动化生产线要求,提高生产效率。     

Control of mechanized surfacing of stamping tools with modulation of conditions

The results of investigations of the effect of the regulated parameters of low-frequency modulation on the characteristics of deposited beads in reconditioning of the working surfaces of dies of stamping tools are presented. The effect of the frequency and duty ratio of the modulated conditions on the mechanical properties of the deposited layer and the structure of its metal is described. Recommendations are issued for the effective application of technology with the controlled modulated conditions in the reconditioning of the working edges of the dies of the stamping tools.     

精密检测在轧机牌坊空间位置测量中的应用

轧机在长期使用中机架牌坊内各窗口接触面、机架底面均会产生不同程度的腐蚀和磨损,使机架与轧辊轴承座间隙逐渐增大,加剧牌坊衬板的磨损,不能保证牌坊的窗口尺寸,从而不能保证轧机的功能精度.通过对轧机设备进行高精度的空间位置检测,可以撑握轧机的位置参数,为保证轧机功能精度提供强有力的数据支撑,以便更有针对性地对轧机进行维护、维...     

20钢渗硼过程中硼化物形核和生长的TEM观察及室温形变的影响SCIEI

本文采用单向减薄制样法在透射电镜下直接观察了20钢渗硼初期硼化物的形核和生长特性及室温形变的影响。X射线及电子探针分析结果表明:渗硼初期试样表层仅有Fe_2B形成;表层硼原子浓度与形变量之间具有单调增长的关系;偏聚于位错胞壁之中的硼原子阻碍了形变组织的恢复和再结晶,加速了硼化物的形核和长大。     

Influence of Fe on Microstructure and Mechanical Properties in Pdoped Ni–Cr–Fe Alloys

The influence of Fe on the microstructure and mechanical properties of P-doped Ni–Cr–Fe alloys has been investigated.Results showed that increasing Fe content refined the dendrite microstructure and enhanced the solubility of P in as-cast alloys. The change of microhardness in different dendrite regions was attributed to the segregation of P atoms in solid solution state, which had strengthening effects. Increasing Fe contents from 15.2 to 60.7 wt% reduced the yield strength and tensile strength but had little influence on the elongation of alloys. The stress rupture life of alloys after heat treatment decreased with the increment of Fe contents, and the failure fracture modes transferred from transgranular to intergranular fracture mode. The change of fracture modes was due to the weakness of grain boundaries caused by the increment of Fe.In addition, the precipitation of M_(23)C_6 was believed to be related to the segregation of P toward grain boundaries, which led to the fluctuation of carbon and chromium atoms near the grain boundaries in alloys with low Fe contents. Consequently, the increment of Fe decreased the strength of matrix and changed the existence of P atoms and the precipitates at grain boundaries.     

RESEARCH ON THE FORMATION MECHANISM OF INTERNAL CRACK IN THE CONTINUOUS CASTING SLAB

In view of the periodic bending deformation of solid-liquid interface in the solidification process for continuous casting slab, the variation of temperature gradient and dendritic spacing in the front edge of the solid-liquid interface, and the nucleation and propagation process of crack were studied. It is shown that the bending deformation of the interface results in the temperature field change in the front edge of solid-liquid interface, and the occurrence of temperature gradient along drawing direction results in the growth of secondary dendrites. The initial crack formed during the middle and final stage of solidification may extend to the surface of the casting slab and become an internal crack. The results of the theoretical analysis are basically in agreement with that of the experiment.     

Effects of Post-weld Heat Treatment on Microstructure,Mechanical Properties and the Role of Weld Reinforcement in 2219 Aluminum Alloy TIG-Welded Joints

In as-welded state, each region of 2219 aluminum alloy TIG-welded joint shows diff erent microstructure and microhardness due to the diff erent welding heat cycles and the resulting evolution of second phases. After the post-weld heat treatment, both the amount and the size of the eutectic structure or θ phases decreased. Correspondingly, both the Cu content in α-Al matrix and the microhardness increased to a similar level in each region of the joint, and the tensile strength of the entire joint was greatly improved. Post-weld heat treatment played the role of solid solution strengthening and aging strengthening. After the post-weld heat treatment, the weld performance became similar to other regions, but weld reinforcements lost their reinforcing eff ect on the weld and their existence was more of an adverse eff ect. The joint without weld reinforcements after the post-weld heat treatment had the optimal tensile properties, and the specimens randomly crack in the weld zone.     

德育的现代转型刍议

我国改革开放的迅猛发展,要求德育实现从传统向现代的转型。这种转型因其受到国情,民情,社情,世情的制约,会很艰难,但当前大学生“三德”匮乏的现实增强了转型的紧迫感。改革传统的德育体制应首先从注重人格教育,公民教育,精英教育入手。     

The Electrochemical Behavior of Oceanic Microbiological Influenced Corrosion on Carbon Steel

The corrosion behavior of carbon steel in the medium of marine microorganisms was investigated by electrochemical impedance spectra, polarization curves, and so on. Experimental results showed that the corrosion potential of carbon steel moved in a negative direction in the unpurified marine microorganism solution, and the polarization style of the cathodic process did not change. The electrochemical impedance spectra showed that the impedance value of the electrode decreased in the medium with bacteria, which indicated that the existence of microorganism could accelerate the corrosion progress of carbon steel.     

冲压圆点连接机理初探

对冲压圆点连接的机理和圆点处的金相组织进行了分析。冲压圆点连接可分为4个阶段 ,即板料初压入阶段、冲压圆点成形初期阶段、冲压圆点形成阶段、保压阶段。由于被连接的板料在冲压连接圆点处受挤压 ,所以在材料的连接处产生压应力 ,提高了连接的抗疲劳强度。此外 ,对冲压圆点连接的特点、应用范围及影响因素进行了论述     

六偏磷酸钠在蛇纹石与黄铁矿分离中的作用

通过浮选试验、沉降试验、表面溶解、ζ电位测试、吸附量测试和红外光谱测试研究六偏磷酸钠在蛇纹石与黄铁矿分离中的作用与机理。结果表明,六偏磷酸钠可以显著减弱蛇纹石对黄铁矿浮选的不利影响,它能在碱性条件下使蛇纹石与黄铁矿分散,从而提高黄药在黄铁矿表面的吸附量。六偏磷酸钠的作用是通过溶出蛇纹石表面的镁,并在其表面吸附,降低蛇纹石表面等电点pH,增强负电性。DLVO理论计算表明,六偏磷酸钠能使蛇纹石与黄铁矿间的总相互作用能由引力位能转变为斥力位能。