共查询到20条相似文献，搜索用时 562 毫秒
1.
介绍了折边机铸铁折边梁断裂的焊接修复方法,以及焊后的加固方案。通过采取一定的工装措施,解决了焊接过程中的变形难题,焊接修复既节约了费用,又保证了生产。 相似文献
2.
3.
4.
折线绳槽是起重行业中钢丝绳滚筒的重要结构。介绍了折线绳槽的结构特点,并且在SINUMERIK 802D系统中,如何应用各种数控指令完成车削加工程序的设计。 相似文献
5.
6.
7.
8.
9.
11.
摩擦学特性对发动机功效的发挥起着重要作用,对其进行分析和探讨有助于改善发动机工作性能。基于斜盘发动机基本结构,建立了其内部组件的球滚动摩擦模型和柱滚动摩擦模型,并推导了相应的滚动摩擦力和滚动摩擦系数公式。然后结合某斜盘发动机具体参数,分别计算了球滚动摩擦力、摩擦系数和柱滚动摩擦力、摩擦系数,通过对比,认为柱滚动摩擦力、摩擦系数远小于球滚动摩擦力、摩擦系数。最后分析了摩擦生热、高温环境对发动机摩擦性能的影响,并指出了下一步研究的方向。 相似文献
12.
针对自动调度模式无法充分发挥调度人员经验和有效响应制造执行复杂现场的问题,提出了人机协同模式下的手工调度技术。建立了自动调度与手工调度相结合的人机协同模式;通过调度甘特图的分层显示处理,采用设备出勤模式、鼠标拾取、手工调度辅助提示等技术,实现了调度工序块的离散化面向对象处理;总结了手工调度中指定设备加工、在设备内移动以及设备间转换等三种标准化操作,建立了以零件调度工序链表和设备调度工序链表为核心的调度数据结构,分析了手工调度操作中的调度约束处理步骤,采用重调度方法实现了调度约束满足的一致性处理;以工程应用背景,开发了集自动调度和手工调度于一体的人机协同调度软件系统,并通过实例验证了手工调度技术。 相似文献
13.
水利水电工程中平面定轮闸门运行工况比较复杂，滚轮与门槽内的轨道之间的滚动摩擦受多个因素的影响，理解影响滚动摩擦的因素对有效设计闸门有重要的指导作用。本文介绍了滚动摩擦在定轮闸门中应用的原理并浅析了常见的失效原因和对策。 相似文献
14.
测张辊及挡辊（又名张力辊）是用于测量机架问的带钢张力的设备，它们都是被动辊，在轧制钢板时，它们的转动是否灵活直接影响钢板的表面质量及产品的成材率。 相似文献
15.
16.
In this research, linear and non-linear stability behaviour of a thin circular FGM plate subjected to the uniform temperature rise and the constant angular velocity loadings is analyzed. Properties of the FGM media are distributed across the thickness based on a power law form. Each property of the metal or ceramic constituents is considered to be the function of temperature based on the Touloukian model. General equilibrium equations for such conditions are obtained based on the classical plate theory. At first, the non-linear governing equations are established in a complete asymmetrical form. After that, two different analytical methods are presented to study the bifurcation behaviour. Existence of bifurcation phenomenon is examined. Pre-buckling analysis is performed for a plate with the immovable clamped edge. Stability equations are obtained based on the adjacent equilibrium criterion. The resulted equations are solved via the two distinct methodologies, i.e. the exact solution in terms of Coulomb wave functions and the power series method. A non-linear solution is also presented to detect the equilibrium path of the heated rotating FGM plate. It is found that the angular speed may stabilize the homogeneous circular plate which buckles during uniform heating. Furthermore, snapping may occur for FGM plates under the simultaneous action of heating and uniform rotation. 相似文献
17.
托辊是带式输机的主要部件,其设计性能的好坏直接影响到输送机的整体性能。托辊的选择是否合理,会影响托辊的使用寿命,合理选择和使用托辊至关重要。 相似文献
18.
19.
Using Monte Carlo simulations of a touching-bead model of double-stranded DNA, we show that DNA extension is enhanced in isosceles triangular nanochannels (relative to a circular nanochannel of the same effective size) due to entropic depletion in the channel corners. The extent of the enhanced extension depends non-monotonically on both the accessible area of the nanochannel and the apex angle of the triangle. We also develop a metric to quantify the extent of entropic depletion, thereby collapsing the extension data for circular, square, and various triangular nanochannels onto a single master curve for channel sizes in the transition between the Odijk and de Gennes regimes. 相似文献