共查询到20条相似文献,搜索用时 140 毫秒
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嵇汉雄 《机械工人(热加工)》1986,(2)
导卫板是轧钢厂、钢厂等消耗量很大的易损件之一。导卫板的作用是使轧件顺利地进入轧槽并导出轧槽,或控制轧件按一定方向运动的零件。因此,导卫板是线材生产中的重要部件。由于该导卫板的使用寿命低,换件频繁(换件不停车),所以直接影响了线材产量和工人的人身安全。为此,提高导卫板的使用寿命就成为生产的关键问题。一、导卫板的损坏形式导卫扳的损坏主要发生在第六道次的K_6铸铁导卫板上,导卫板有以 相似文献
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轧机导卫装置的发展及改进 总被引:1,自引:0,他引:1
导卫广泛用于型材、棒材和线材轧机中 ,以保证轧件的精确公差和屈服强度。导卫是根据不同的要求特殊设计的。关于导卫的改进主要集中在型钢轧制和切分轧制 相似文献
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导卫板是轧钢厂、钢厂等消耗量很大的易损件之一。导卫板可使轧件顺利地进人轧槽并导出轧槽,或控制轧件按一定方向运动。因此,导卫板是线材生产中的重要部件。由于导卫板使用寿命低,换件频繁,所以直接影响线材产量和人身安全.为此,提高导卫板的使用寿命就成为生产中的关键问题.l导卫板的损坏形式导卫板的损坏主要发生在第六道次的K6铸铁导卫板上,导卫板有以下两种损坏形式:一是导卫板表面粘合工件金属;二是表面被磨损出损性沟痕.为了解决上述问题,我们决定在铸铁导卫板上喷涂一层耐磨材料,用以提高导卫板的使用寿命.2喷焊工… 相似文献
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《现代制造技术与装备》2020,(5)
详细阐述螺纹钢筋纵肋扭转形成原因,并通过优化轧机装配、导卫调整等措施发明了一种精确在线检测的方法,便于快速准确测量、及时验证,解决了纵肋扭转给客户带来的不利影响,促进产品质量迈向了一个新台阶。 相似文献
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郭其江 《现代制造技术与装备》2018,(7)
切分轧制技术就是指在轧制过程中利用轧辊孔型、导卫装置中的切分轮或者其他切分装置,将轧件沿纵向切成两线或多线的轧制技术。在棒材生产中,切分轧制技术能够较大程度提高小断面品种的产量。随着科学技术的发展,切分轧制技术也不断发展,出现了三线、四线等多线切分轧制技术,但是这种轧制技术多用于生产热轧带肋钢筋,在圆钢方面尚未得到实际应用。 相似文献
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后掠式叶片具有载荷自适应性,提出了一种以自然样条曲线为后掠曲线,以扭角为优化参数的后掠式叶片优化设计方法。以直叶片模型为设计起点,通过Profili软件获得叶片的截面数据并计算叶片翼型在不同攻角下的升力系数与阻力系数,以叶片功率系数最大以及叶片根部载荷最小为优化目标,采用遗传算法对叶片进行优化设计。根据优化结果获得的参数,建立后掠式叶片三维模型,在ANSYS Workbench中建立流场模型进行仿真分析得到叶片模型的压力分布情况。结果表明,通过对扭角、后掠值进行优化,后掠叶片模型对比直叶片模型其受到的载荷有所减小,优化设计方法可以用于指导后掠叶片的设计。 相似文献
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为了实现对数控机床形位误差精密测量,采用扭簧表及大理石平尺搭建导轨直线度测量装置,以HEIDENHAIN绝对式直线光栅尺为定位精度测量硬件,PC端通过数据采集卡获取测量信息,并基于LabVIEW开发虚拟仪器,实现了对数控机床导轨直线度、定位精度和重复定位精度项目的测量;提出了一种基于LabVIEW平台构建数控机床形位误差测量系统的新方案。在相同的检测参数下,对同一台数控机床进行检测,并与激光干涉仪测量的数据比对,激光干涉仪采用GB/T17421.2-2000统计分析方法,实验结果表明,本系统具备较高的测量分辨率和测量精度。 相似文献
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Minjin Oh Moon Kyu Lee Naksoo Kim 《Journal of Mechanical Science and Technology》2010,24(12):2545-2553
Roll-formed slide rail used as a linear guide in the smooth movement of drawers and electric home appliances requires geometric
accuracy because of a high slenderness ratio and repetitive usage. The slide rail members are generally manufactured by the
roll forming process. The members need to be improved through optimization of the roll forming process instead of the designer’s
experience. The aim of this study is to determine the optimal roll forming parameters by using robust optimization technique
which simultaneously satisfies three criteria such as the shape difference factor, bowing factor and modified inverse safety
factor. In analyzing the roll forming process of a slide rail, the pass in which the largest deformation occurred is designated
as the target pass. The positions and the curvature of rolls are set as the design variables in the target pass. The cost
function, which is comprised of the shape difference factor, the bowing factor, and the modified inverse safety factor, is
obtained using design-of-experiments of the response surface method. The cost function is minimized by using robust optimization
techniques and showed the improved the straightness and the durability value. Using robust design methodology, it is able
to be constructed a multi-objective function, and optimized three criteria, simultaneously. 相似文献
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通过拆除驱动元件气缸缸座内防尘圈,减少了枉塞与缸座缓冲孔的摩擦,使气体能快速通过缓冲孔作用在活塞上,在保证气缸正常工作的同时减少了气缸的启动和缓冲时间。更换其控制元件,提高其换向的灵敏性,缩短挟向时间。并对管路系统改造优化,可提高气缸的反应速度,缩短卷取炉导板装置的升降时间,提高炉卷轧机的穿带速度和轧制速度及轧件头尾表面质量。 相似文献
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A modeling and analysis of spring-shaped torsion micromirrors for low-voltage applications 总被引:1,自引:0,他引:1
J.-M. Huang A.Q. Liu Z.L. Deng Q.X. Zhang 《International Journal of Mechanical Sciences》2006,48(6):650-661
An electrostatic torsion micromirror is designed using the optimized spring-shaped torsion beams and U-shaped groove supporters. The main advantages of this design will be a reduction in the pull-in voltage for low-voltage applications and the function as a switch of the instability mode by adjusting the effective bending stiffness of the torsion beam. In this design, a theoretical model is developed to demonstrate the static characteristics of the electrostatic torsion micromirror. The pull-in effect is investigated specifically to predict the pull-in voltage, pull-in angle, and pull-in displacement. These parameters depend significantly on the electrode size and position, position of the groove, and ratio of the bending and torsion effect of the torsion beam. In addition, the effective torsion and bending stiffness model is provided using the energy method with the objectives to optimize the spring-shaped geometries of the torsion beams and to decrease the pull-in voltage below 2 V. The U-shaped groove supporters are applied in the theoretical model to adjust the effective bending stiffness of the torsion beam and to switch the instability mode of the torsion micromirror. The theoretical analysis is consistent with the numerical simulation using MEMCAD and experimental results measured by an optical projection method. 相似文献
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A new type of induction motor with a built-in torque sensor (called a ‘torque-sensor motor’) has been developed in order to monitor grinding torque. Its rotor shaft consists of a hollow shaft and torsion bar, each of which has a disc with equiangularly located magnets. The torque output is calculated by microcomputer from the time delay of pulses generated in detecting coils. This toque sensor has good linearity. Torque ripple and zero-point drift caused by rotational speed change are estimated to be less than 1 Nm. It is so sensitive that it can detect torque ripple from rotational error of the driving belts on the grinding machine. Further, it can accurately monitoring grinding torque by using a low pass filter to remove such torque ripple. It can also be used to estimated the time constant of the grinding wheel and workpiece system in the transient torque situation of a grinding cycle. The performance of the grinding wheel motor is as good as that of a conventional motor. 相似文献