杨洗陈 Yang Xichen's research while affiliated with Tianjin Polytechnic University and other places
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Publications (16)
Off-line automatic programming system of laser remanufacturing robot based on 3D vision is developed in order to repair the complex parts accurately and efficiently. The system mainly consists of six functional modules: machine vision measurement, 3D modeling, remanufacturing planning, automatic programming, simulation and optimization, and communi...
Machine vision system plays an important role in improving the quality of laser robot system. A system to detect three-dimensional (3D) shallow spot defects by combining two-dimensional (2D) images with 3D point clouds is carried out, which solves the problem of 3D positioning of shallow spot defects. With gray image processing, including image enh...
Repair path of 3D laser cladding remanufacturing is studied and generation algorithm automatically of repair trajectory is proposed based on equidistant parallel sections in order to conquer the shortages using on-line teach processing path for damaged parts of complex free-form surfaces in laser remanufacturing. The positions of laser beam scan po...
Defect detection of three-dimensional structures is essential for intelligent laser robot system. A method to detect structural damages in robot laser remanufacturing is presented, and a high precision algorithm is proposed to predict edge locations of damaged part. Initial edge points of the damaged parts are identified using normal-vector techniq...
To increase the efficiency and accuracy of laser remanufacturing, a method of path planning with combining the characteristics of reverse engineering and laser remanufacturing is presented. The following aspects are contained: obtaining point clouds by scanning the surface of worn workpieces, reconstructing of repair area by reverse engineering, do...
Machine vision plays an important role in measuring and controlling for laser robot processing. Based on CCD/CMOS, three kinds of machine vision systems for laser remanufacturing robot are developed to reconstruct of 3D-CAD part, temperature field and powder stream field. Their parameters are as follows: scanning width is 200 mm, scanning speed is...
An intelligent laser processing robot with active vision composed of binocular stereo camera and structure light is developed in this paper. It can measure a variety of complex surface and reconstruct its 3D shape. The system consists of a robot with six degrees of freedom, binocular cameras and structure light. Cameras and structure light emitter...
Binocular stereo vision system is equipped in laser remanufacturing robot. The robot can automatically find the defect of objects to be repaired and give the best repairing path and technological parameters. Calibration is the basic and key task of vision system. Two cameras are installed in the robot terminal and calibrate the two-dimentional (2D)...
Laser processing robot is to be toward 21st advanced manufacturing technology in the world. The principles, constructions, kinds and applications of the robot are comprehensively summarized. Some key techniques for laser robot are focused on fiber transferable lasers, robot body, online and offline programming, robot intelligence and networking and...
There is physical processing of laser energy absorption and attenuation in coaxial powder flow. Theoretical models of temperature fields for carrying gas/powder two phase flow from coaxial nozzle have been presented from Beer-Lambert law. Based on the models, the calculated simulation of temperature field in powder flow has been achieved. The influ...
In order to analyze the interaction of laser and spherical particles in coaxial laser cladding, the physical model of laser scattering by spherical particles is established by using Mie scattering theory in certain assumptions, which will help select the laser and the spherical powder. The distributions of laser intensity with radius of particles a...
It is very important for temperature field testing in laser processing. Temperature field is an important parameter which affects the quality of laser processing. In order to control profile of laser molten pool and improve process design, precision and quality in laser processing, it is very necessary to study the temperature distribution. The ima...
In carring gas/powder two phases flow from laser coaxial nozzle there are three main physical processings of energy, momentum and mass transferences, which directly affect the quality and accuracy of the parts by laser manufacturing. Comprehensive results reseached on momentum and mass transferences of the two phases flow have been reported: Physic...
In order to analyze the velocity and temperature of moving metal particles in coaxial laser cladding, and to study the influence of process parameters, the movement model and thermal model of moving metal powder particle were proposed. The simulated results show that the nozzle geometric structure, particle size and initial velocity of the shield g...
A numerical model of velocity distribution of shielding gas-metal powder two phases flow field output from the nozzle in laser cladding is established, and it is calculated by FLUENT software. In this model, the influences of momentum and mass transmission on the two phases flow are taken into consideration. The metal powder flow field velocity dis...
Citations
... With the development of computer graphics and the cognitive dimension, three-dimensional reconstruction technology has demonstrated broad application potential in robot control, reverse engineering, medical field and so on [1][2][3][4][5][6][7]. The three-dimensional reconstruction based on single or multiple line structured light can reach micron level in measurement accuracy, which is more suitable in practice and has higher measurement robustness [8]. ...
... Many researches have been carried out on the powder transport behavior. Scholars have mainly studied the influence of the collision between the powder and the nozzle in the process of gas-powder transport [19][20][21][22][23], powder properties [24][25][26], and the effect of process parameters on the gas-powder transport behavior and powder convergence [27,28], revealing the gas-powder transport mechanism, and somewhat improving the powder stream convergence and the utilization rate of the powder. However, the coaxial powder feeding mode cannot avoid the collision between powders, and the powder movement process is uncontrollable. ...
... Non-contact optical measurement technology has been widely used in industrial fields such as spraying, welding, grinding [1][2] because of its advantages of fast measuring speed, high precision and non-destructive positioning and measurement. Non-contact 3D shape measurement methods based on photoelectric sensors and image processing are divided into two types: one is passive measurement without additional light sources, such as binocular(multiocular) vision, and the other is an active measurement method of adding light source, such as Time of Flight, ToF [3] , Laser triangulation method [4] , the structured light method, the phase shift method [5] and so on. ...
... The watershed algorithm and its improved algorithms have been widely used in image segmentation and recognition in agriculture [23,24], medicine [25,26], remote sensing [27,28], and other fields. Several researchers have also been concerned with watershed-algorithm-based surface defect recognition and extraction [29][30][31]. To the best of our knowledge, however, there are few studies on the identification and extraction of rust pits on the surfaces of corroded steel structures using watershed algorithms. ...
... Due to the significance of reconditioning scheme design, it has attracted much attention of scholars. For instance, Ling et al. [11] adopted the equidistant parallel section method for the repair path optimization of complex free surface parts. Cao et al. [12] proposed a two-stage remanufacturing process optimization decision method based on expert evaluation and fuzzy regression to overcome the uncertain and incomplete information problems during the decision-making process. ...
... Then, the grinding path with smooth curvature was discretized by the equal-step method, and the normal direction at the contact point was estimated by local plane fitting. Liu Lifeng et al. [10] used 3D laser scanner to reconstruct complex objects, extract characteristic surfaces or surface defects, and carried out robot processing or defect repair through off-line programming system. Chen Ying et al. [11] obtained the point cloud data of the cladding surface by using a three-dimensional scanner, applied the slicing method and the non-uniform rational B-spline surface fitting method, and obtained the trajectory points of the gun head by bias a certain distance, so as to plan the robot trajectory when laser cladding surface. ...
... Laser cladding is an instantaneous processing process. Although the cladding process is very short, it contains rich interactions of the laser with the cladding material and substrate material [9,10], the complex metallurgical physicochemical reactions after the formation of the molten pool, and the rapid solidification process of the molten pool [11,12]. The completion of each stage of the cladding process is closely related to the technological parameters of laser cladding. ...
