共查询到19条相似文献,搜索用时 937 毫秒
1.
采用计算机数字图像处理技术对钢板宽度进行实时检测。在硬件结构上,采用双CCD感光器加激光线辅助光源扫描检测技术,提高系统检测精度。根据CCD成像原理及三角形相似定理,对因钢板宽度变化及钢板边缘上浮所引起的宽度变化计算模型进行了推导,提出了采用激光线遮挡板分线法来判定钢板边缘上浮所引起的测量误差,并根据误差测量结果,对钢板宽度进行了修正;同时,通过分析CCD激光线条最佳成像方法对系统进行了试验标定。结果表明,该系统的测量精度能满足实际生产需求。 相似文献
2.
介绍一种零件表面粗糙度的激光在线测量系统,该系统基于激光三角测量系统,用无衍射激光光束作光源,用高精度的CCD摄像机作位移传感器,通过计算机进行数据处理得到表面粗糙度值。以车削表面为例,用触针法测得的表面粗糙度值和用该系统测得的表面粗糙度值相近,说明实现表面粗糙度在线检测是可能的,该测量方法具有测量速度快和能够显示被测表面的具体形貌等优点。 相似文献
3.
4.
针对激光光束投影法直径测量精度受多种因素影响而下降的问题,提出了一种计算圆柱体直径的解析几何方法。分别用解析几何方法和近似等腰三角形方法推导出圆柱工件直径计算公式,并进行了圆柱工件直径测量仿真,分析了激光源位置、被测工件位置、线阵CCD分辨率和被测工件直径等参数对直径测量结果的影响。结果表明,在激光源位置、工件位置和工件直径变化时,提出的解析几何方法仍能够保证直径测量的准确性,其测量误差只与线阵CCD传感器的分辨率有关;提高CCD传感器的分辨率,可以提升圆柱工件直径的测量精度。采用解析几何方法和高分辨率的线阵CCD可满足激光直径测量系统高精度的应用要求。 相似文献
5.
极坐标数控铣齿机回转台运动精度干涉测量 总被引:1,自引:0,他引:1
根据极坐标数控铣齿机床回转工作台的运动特点,采用Renishaw双频激光干涉仪测量回转台的运动精度,对干涉仪角度测量原理和光路调节方法进行了详细探讨,获得了准确的回转台定位精度和重复定位精度数据,最后根据已建立的几何误差模型,并利用辨识得到的误差数据,可以准确计算出机床的各项几何误差,为误差补偿提供了理论依据。 相似文献
6.
论文主要介绍了利用CCD测量被加工工件尺寸的工作原理以及压电传感器逆压电效应的工作原理。阐述了CCD测量工件直径的理论、方法和压电传感器组的结构和工作过程。详细论述了该测量控制系统是如何进行实时、动态和自动监控、测量被加工工件的尺寸变化;以及系统是如何根据工件尺寸的变化来判断刀具的磨损情况,根据测量结果来自动发出刀具过度磨损信号,并自动驱动系统控制压电传感器根据磨损情况来确定刀具的补偿量,从而完成对刀具磨损的自动补偿。 相似文献
7.
建立一种主动视觉传感系统,以小功率激光器作为主动光源投射激光到特制光栅上,在焊接熔池表面形成变形激光条纹,用加了窄带滤光片和中性滤光片的CCD在系统另一侧实时拍摄熔池图像。选取合适的激光入射角度和CCD拍摄角度,较好的避开弧光对熔池图像的干扰,采集到熔池区变形激光条纹。对熔池图像特征进行分析,变形的激光条纹反映了熔池的下塌或上凸状态;成功提取熔池边缘和激光条纹边缘;通过标定、计算得到熔池正面几何参数,为今后实时检测焊接熔池表面的三维信息奠定了基础。 相似文献
8.
9.
10.
《铸造》2020,(6)
为了提高大型球墨铸铁管的直径测量精度和效率,建立了一种基于机器视觉的大型球墨铸铁管直径测量系统,分析图像特点,提出了一种基于邻域灰度值差异的边缘检测方法。检测系统是由一台CCD相机、LED光源和计算机组成的机器视觉测量系统。CCD相机采集图像,对图像进行图像滤波、图像分割、图像边缘检测和图像亚像素边缘检测的处理后,提取管材的边缘轮廓,利用最小二乘法将管材两边缘点拟合为两直线,根据相机成像的小孔成像原理和圆柱物体的成像特性计算管材直径,建立了相应的数学模型。实验证明,本系统可以精确、高效的实时检测管的直径大小,测量误差小于0.1 mm,符合实际测量的需要,具有很高的实用价值。 相似文献
11.
Tomasz Baraniecki Edward Chlebus Marian Dziatkiewicz Jakub Kędzia Jacek Reiner Marcin Wiercioch 《Welding International》2016,30(2):98-102
The article presents the technology of laser cladding of metallic powders and a machine for laser microsurfacing developed for this purpose. This specifically designed and manufactured station is based on a three-axis CNC machine, equipped with appropriate laser safety systems and a dust extraction system. A disc laser is used as a source of laser energy, connected with the processing optics by a fibre optic cable. A brush powder feeder with a nozzle for shaping the flow of powder transfers the powder coaxially with the laser beam. The system is integrated with a PC-motion card which acts as a CNC controller. The article also presents the results of laser surfacing experiments, classified in terms of the following criteria: surfacing height, width and depth of penetration, wetting angle and microstructural parameters. The laser power density, powder feeding rate and density, as well as the relative movement of the welding head against the component, have been selected as independent parameters. 相似文献
12.
13.
14.
介绍了以大功率UV-LED为光源的光固化快速成形系统(LED-SL)的基本原理.针对UV-LED的光源特点,研究了光束发散角对树脂固化形态的影响,在Jacobs光固化理论的基础上,建立了发散光束固化单线形状的数学模型.分析比较了UV-LED、激光、汞灯光源固化单线形状的差异及其对零件精度的影响.通过比较,阐述了LED ... 相似文献
15.
为解决现有球形电机检测系统结构复杂、成本较高的问题,提出了一种基于光学测量的非接触式检测技术。分别在球形转子和定子上布置环形光源和硅光电池阵列,转子带动环形光源偏转导致硅光电池阵列上光斑面积发生变化,从而影响输出电流。建立了短路电流与位姿角的数学模型,并搭建实验平台,对球形主动关节转子进行轨迹规划,实验表明,该方法能实现球形转子位姿的准确测量,位姿角误差控制在0.45°以内。研究结果对转动刚体的位姿检测和空间定位具有理论与实用价值。 相似文献
16.
An on-machine three-dimensional monitoring system has been developed that uses machining YAG laser as a source of light for monitoring. In the monitoring stage, the output of the laser is decreased. The reflected light from a workpiece is taken out with a beam sampler on the way of the optical system, and observed by CMOS image sensor. This system can measure both Z-direction depth and the position of X–Y-direction. Because the same laser and the optical system are used, the system has no gap of an optical axis between the measurement and the machining, and also has no limitation of viewing angle. Every three-dimensional shape which can be machined by laser beam can be measured. In this paper, system configuration, monitoring technique and the experimental results are described. 相似文献
17.
18.
19.
J. Jurkovic M. Korosec J. Kopac 《International Journal of Machine Tools and Manufacture》2005,45(9):1023-1030
This paper suggests a reliable direct measuring procedure for measuring different tool wear parameters. Modern image processing techniques and machine vision systems today enable direct tool wear measurement to be accomplished in-cycle. The presented system is characterized by its measurement flexibility, high spatial resolution and good accuracy. The system consists of a light source to illuminate the tool, CCD camera, laser diod (used in conjunction with profile deepness assessment) with linear projector, grabber for capturing the picture, and a PC. The technique is specially characterized by its determination of profile deepness with the help of projected laser raster lines on a tool surface. So it has advantage comparing with other techniques, which can measure only 2D profiles. With the technique presented in this paper a 3D image of relief surface can be obtained without having need to employ a very complicated measuring system. All indirect methods like acoustic emission, force measurement, spindle current measurement, vibration sensors, etc. are very time consuming and demand very expensive subsidiary measurement equipment, compared with the method presented here. 相似文献