基于嵌套分区算法的堆垛机作业路径优化

对嵌套分区算法在堆垛机作业路径优化问题中的应用展开研究。利用嵌套分区算法能有效利用问题本身信息的优点,对堆垛机单一出(入)库作业和入(出)库复合作业路径进行优化。通过计算机仿真证实:该算法对作业点较少的堆垛机路径优化问题有较高的优化精度和效率,特别是在小型立体仓库的堆垛机作业路径优化领域应用前景广阔。     

巷道堆垛机自动存取通用托盘的研究

为实现仓储的自动化,研究了巷道堆垛机对通用托盘的自动存取。对仓储作业中的巷道堆垛机进行方案设计,并利用单片机来控制巷道堆垛机的行走、升降、上架和下架、取货和放货等作业。通过试验验证了单片机能够对巷道堆垛机进行有效控制,实现了巷道堆垛机对通用托盘的自动存取。单片机控制所需设备简单,易于维护,为后续研究仓储作业自动化提供了依据。     

旋转关节型堆垛机的运动轨迹分析

堆垛机是物流设备之一,在物流工程中占有重要地位.文章介绍了4自由度堆垛机的结构特点,通过示教再现作业和运动轨迹规划,对堆垛机的动作进行了分析研究.     

实现铝锭堆垛、称量、打包一体化控制系统

国内大多数铝锭生产企业在铝锭打包过程中。均采用人工作业方式。为此，根据铝锭生产工艺和技术要求以及现代科学生产管理理念。探讨铝锭称量、堆垛、打包一体化控制系统的研究，其主导思想是在原有的铝锭堆垛机控制系统上，实现铝锭自动化流水作业的功能，改变原有的铝锭生产作业方式。     

高速高加速巷道堆垛机结构强度研究分析

双立柱巷道堆垛机水平行走加速度达到1.5m/s2时,堆垛机在启动和停止时产生很大的惯性力,需要研究分析堆垛机结构受力以验证其是否符合强度要求.文章以某型号双立柱堆垛机为基础,建立高速高加速堆垛机金属结构模型并对其进行合理简化,运用经验公式和应用Ansys软件对堆垛机高速运行时的堆垛机结构强度进行计算和有限元分析,并分析比较其结果.合理简化了高加速堆垛机结构模型,得到了堆垛机结构的应力及变形云图,得到堆垛机立柱最大变形量和最大应力值;验证了堆垛机立柱根部受到不对称交变应力,堆垛机运行时立柱危险截面在发生运行方向前立柱和下横梁的交界处.文章所研究堆垛机结构满足高速高加速运动时的结构强度要求,为研究高速高加速堆垛机提供重要依据.     

55钢铸坯堆垛过程热-力耦合数值分析

建立了55钢铸坯堆垛过程热-力耦合数学模型,并对计算结果进行了验证。分析了不同堆垛条件(堆垛初始温度、堆垛高度和铸坯宽度)对铸坯温度和应力的影响。研究表明,堆垛顶部铸坯冷却速度最快。堆垛铸坯温度高于55钢相变温度(Ar_3、Ar_1温度分别为755℃和690℃)时,中间铸坯温度出现一平台,堆垛有利于缓解铸坯内部热应力和相变应力。随堆垛高度和铸坯宽度增加铸坯冷却速度先是降低较快,而后变化不大。堆垛顶部和底部铸坯在堆垛过程中受到的是拉应力,中间铸坯为压应力。堆垛铸坯表面应力大,应力不均匀是铸坯产生裂纹、变形等质量问题的原因。根据以上研究结果,建议在堆垛铸坯表面覆盖一层保温罩,以减小表面热损失和55钢铸坯表面应力;不在55钢相变温度范围进行堆垛和拆垛操作;另外,铸坯堆垛高度应与铸坯宽度相匹配。     

连铸坯堆垛缓冷过程温度场数值模拟研究

铸坯堆垛处理是连铸-轧制区段衔接的重要缓冲单元。掌握铸坯堆垛过程的温度变化规律有利于优化改进制造生产流程。采用有限元数值模拟方法研究连铸坯堆垛过程的温度分布规律,计算了铸坯达到入炉温度时堆垛的时间。它为制定合理的铸坯下线堆垛工艺制度提供依据和参考。     

中小型型钢堆垛机

斯罗曼型钢堆垛机,在西德和国外轧钢车间已运用多年,实际表明,效果良好。它用来精确堆垛扁钢、角钢、槽钢、工字钢。一般说来,一台高生产率的轧机,设有两台堆垛机即可。现将中小型型钢堆垛机操作顺序概述如下(以堆垛角钢为例,加以说明):1.处于原始位置的辊子台架4,第一批角钢料进入堆垛机,放下提升磁铁2,如图1所示。     

取件机械手在冷室压铸机中的控制应用

取件机械手的应用可大幅提高压铸生产效益,以取已压铸的铸件为例,通过回转、进退、升降、夹放伸缩等四工位操作,可实现已压铸铸件的转移堆垛,特别是对流水线作业的压铸生产,在保证效率和利润的前提下,可降低劳动强度,优化产业结构。     

基于有限元分析的单立柱堆垛机结构优化与改进

针对单立柱堆垛机结构受力复杂,刚度要求高等特点,文章运用有限元分析方法对单立柱堆垛机进行建模及静力学分析,并对单立柱堆垛机截面尺寸进行优化设计,使优化后立柱刚度提高40%左右,达到了在安全范围内降低了制造成本,提高了堆垛机的工作性能和使用寿命。     

铸坯堆垛冷却过程传热模型研究

针对堆冷过程中铸坯温度的变化规律，采用数学模拟和现场实测方法进行了研究。研究表明：堆冷开始时，堆垛的中间区域是高温区，随着冷却时间延长，高温区缓慢向下移动；冷却速率最快的是顶部铸坯，而中间区域和底部区域的冷却速率较慢，堆冷铸坯的冷却速率为8．1-14．2K·h^-1.     

叠层热流道模技术发展动态

在介绍叠层热流道模具的典型结构的基础上,着重阐述了当今国内外叠层热流道模技术的发展动态。利用叠层式热流道模具可以实现人力与设备的节省、效率的极大提高和制品质量的稳定。     

耐酸胶泥在脱硫烟囱防腐中应用可行性初探

结合一失败案例,探讨了耐酸胶泥内衬在脱硫烟囱排烟筒中使用的技术可行性,从设计,施工,材料特性等方面进行了分析,得出了耐酸胶泥内衬在脱硫后的湿烟囱排烟筒中需要慎重使用的结论。     

叠式热流道模具研究

介绍了叠式热流道模具的研究进展 ,包括叠式热流道模具的基本组成结构、热流道系统、温控系统、开模机构的设计与选择等 ,并对叠式热流道模具设计过程中应该注意的问题进行了详细的阐述。     

玻璃钢烟囱设计规范主要技术内容解读

结合国标《烟囱设计规范》修编,对新编制的玻璃钢烟囱适用范围、材料选择、结构设计、制造和安装等技术内容做了解读和说明,为更好理解和准确使用玻璃钢烟囱设计规范提供参考。     

火力发电厂烟气脱硫后烟囱的腐蚀与防护

随着烟气脱硫技术在火力发电厂的普及,烟气对烟囱的腐蚀性加强,烟囱的腐蚀防护已成为发电厂重点关注的防腐蚀工作之一。通过分析脱硫后烟囱的腐蚀环境和运行环境,分析目前采用的防腐蚀材料的应用情况,对烟囱腐蚀防护设计中需要考虑的因素进行了分析,对烟囱防腐蚀工作提出了建设性意见。     

A radiation-based approach to planar solid oxide fuel cell modules

This article describes the initial analysis underlying the design of a core module consisting of a 1 to 3 kW solid oxide fuel cell (SOFC) stack and a radiant air preheater (RAP) module. The design and testing of three SOFC stack/RAP modules was part of a California Energy Commission-sponsored project with the Gas Technology Institute. The objective of the design was to improve the thermal management of an SOFC system through radiant heat transfer from the stack walls to adjacent air preheater panels. The testing of this and subsequent modules has suggested that use of the radiation-based approach significantly improved the management of stack-generated heat. This paper was presented at the ASM Materials Solutions Conference & Show held October 18–21, 2004 in Columbus, OH.     

高锰钢中的TRIP和TWIP效应以及层错能研究

基于光学显微镜、XRD、TEM和SEM的测试结果,分析了不同成分高锰钢中的TRIP和TWIP效应及其影响因素,并且研究指出在这两种效应的作用下此类钢种将表现出不同的力学响应,而层错能则是判断这两种效应的重要参数;此外,通过测定层错能可预测高锰钢中的强化机制,并有望借此优选成分以获得新型汽车用高强度钢板.     

The interlayer gap and non-coaxiality in stack drilling

Interlayer gap formation during through-hole drilling in stacked structures is a common problem in large assembly operations. The resulting interfacial burrs and non-coaxial stacked holes deteriorate the machining quality and increase the overall assembly time and costs. This study presents both experimental work and theoretical analysis to understand the interlayer gap formations and non-coaxiality occurrences in the drilling of stacked structures of broad skins and narrow stringers, which imitate typical structures of large assemblies. First, some stack drilling experiments are specially designed and are performed to observe that the stacked holes are non-coaxial in a regular fashion by measuring the hole diameters of the upper layer, lower layer and interface. Then, a simplified mechanical model of the stacks is built in 2-D to study how the interlayer gaps and non-coaxiality are formed during stack drilling. Through quantitative analysis based on the simplified model, it is noted that the stack stiffness, drilling thrust force and pressing force have important impact on the interlayer gaps and non-coaxiality. Finally, finite element methods are adopted to present the deformations in 3-D. The calculation results agree with the theoretical explanations for non-coaxiality given by the analytical simplified model. In addition, the beneficial effects of the fasteners and ribs are discussed based on the calculation results, and thus, they could contribute to proposals for better designs for stack drilling.     

Strength and creep of structural materials based on intermetallic compound NiAl

The effect of thin tungsten and molybdenum layers, which were applied onto powder particles of intermetallic compound NiAl or its alloys with Hf and Nb before their pressing, on the hot strength and short-time creep strength of compact samples obtained from such granules has been studied. Such materials are proposed to be called composite materials (CM) with a honeycomb structure. Miniature samples in the form of small cylinders 5 mm in diameter and 5–8 mm in height were tested for compression at 1000–1300°C in air and for creep upon compression at 1050, 1110 and 1210°C in a vacuum. Alloying NiAl with hafnium or niobium increases the hot strength of the alloys by a factor of 1.4–3.7; the formation of honeycomb structure increases this characteristic by a factor of 1.6–3.6 at 1000°C; with increasing test temperature to 1300°C, the effect of solid-solution strengthening decreases to values typical of pure NiAl (σ_y = 7–12 MPa), and the effect of the honeycomb structures increases to σ _y ^CM / σ _y ^NiAl 6–7 at σ _y ^CM = 50–80 MPa. The creep strength characteristics of the CM σ _1% ^h/y and σ _10% ^h/y at all test temperatures are higher by a factor of 1.5–2.4 than those of NiAl and its alloy with Hf; they are as high as σ _1% ^h/1210 = 40.4 MPa and σ _10% ^h/1210 = 61.3 MPa for the NiAl + W(1 μm) CM and σ _1% ^h/1210 = 17.7 MPa and σ _10% ^h/1210 = 26.3 MPa for NiAl. For the composite material with a honeycomb structure, the attained gain in the working temperature relative that of the nonstrengthened NiAl is ～ 160 K.