The phenomenon of burring is common in the manufacturing of metal parts.This phenomenon directly influences the assembly accuracy and service performance of the mechanical parts.In this work,we propose a vision⁃based ...The phenomenon of burring is common in the manufacturing of metal parts.This phenomenon directly influences the assembly accuracy and service performance of the mechanical parts.In this work,we propose a vision⁃based method for two⁃dimensional planar workpiece.The proposed technique has the ability to recognize burr contour and generate the coordinate sequence in real⁃time along x and y directions.The robotic deburring efficiency is improved based on the quantitative information of the burr size.First,by utilizing the local deformable template matching algorithm,we match the standard workpiece contour with the workpiece contour to be processed and compute the corresponding pixels distance between the two contours.Second,we set the distance thresholds in order to divide the burr contours into different levels.We extract the coordinates of the burr contours and map them to the standard workpiece contour.As a result,the closed⁃loop robotic deburring path sequence is generated.Finally,on the basis of the quantitative information of burr size,we adjust the deburring speed in real⁃time during the deburring process.The experiments performed in this work show that the deburring time of the proposed method is reduced by 15.45%,as compared with the conventional off⁃line programming deburring methods.Therefore,for industrial mass production,the deburring efficiency is greatly improved.展开更多
This paper aims to give an insight into the development and evaluation of force controlled machining processes with a commercially available setup. We will focus on a deburring and a grinding scenario, representing th...This paper aims to give an insight into the development and evaluation of force controlled machining processes with a commercially available setup. We will focus on a deburring and a grinding scenario, representing the major applications in today’s robot machining. Whereas the deburring use-case implements a force dependent feed-rate control, the grinding use-case implements an orthogonal force (pressure) control. Both strategies will be evaluated and the influence of general machining and robot specific parameters will be discussed.展开更多
In an appropriate electrochemical environment, the discrete thermal electron emission could be induced in the micro area due to the uneven distribution of electron flux on the anode surface. Thus an oxygen molecule co...In an appropriate electrochemical environment, the discrete thermal electron emission could be induced in the micro area due to the uneven distribution of electron flux on the anode surface. Thus an oxygen molecule could be ionized at the liquid-solid interface after collision, and then oxygen plasma with distribution characteristics would be formed. The plasma electrolytic oxidation（PEO） could happen at the liquid-solid interface. In this work, the low carbon steel was used to study the deburring process by PEO at a high frequency（70000 Hz）pulse DC mode. Its burr height H from 3.23 mm to 0.04 mm was removed to form a smooth surface within 6 min. The values of corrosion potential and current density for the untreated sample were -0.667 V and 6.735×10^（-5）A/cm^2, respectively. But for the treated sample, the corrosion potential and current density were relatively lower,-0.354 V and 1.19×10^（-7）A/cm^2.Therefore, PEO was expected to be a new deburring method of carbon steel for the material processing field.展开更多
Deburring of high-precision components to their micrometer features without any damage is very important but of great difficulty as the burr-to-functionality size ratio increases. To this end, this paper proposes a ne...Deburring of high-precision components to their micrometer features without any damage is very important but of great difficulty as the burr-to-functionality size ratio increases. To this end, this paper proposes a new deburring method in which the micro burr should be directly removed based on ultraprecision cutting with the designed monocrystalline diamond tool. To determine the feasibility of the proposed method, this paper applies it for deburring of the precision working edge of the servo valve core. Firstly, the monocrystalline diamond tool is carefully designed by covering a variety of topics like rake angle,clearance angle, edge radius. Then, the finite element(FE) simulation was conducted to characterize the deburring performance during the removal of the micro burr produced by the single abrasive grinding. Finally, an innovative self-designed deburring system was introduced and the deburring process was evaluated in terms of cutting forces, temperatures, tool wear mechanisms and deburring quality of the working edges by experiments. The FE simulation results indicate the suitability of the proposed deburring method. Meanwhile, the experimental findings agree well with simulation results and show that ultraprecision cutting with the specialized monocrystalline diamond tool could be successfully used for deburring of servo valve core edge without any damage. This work can provide technical guidance for similar engineering applications, and thus brings an increase to the machining efficiency for the manufacture of precision components.展开更多
In this paper, a new forming model of the feed direction burr for drilling process is presented. The feed direction burr formation is experimented and studied. The related theories are analyzed, and the influential ...In this paper, a new forming model of the feed direction burr for drilling process is presented. The feed direction burr formation is experimented and studied. The related theories are analyzed, and the influential factors of the feed direction burrs are pointed out. Furthermore, a certain number of new measures to prevent and decrease the burr in drilling process are advanced.展开更多
A magnetic abrasive finishing process using an alternating magnetic field is proposed for the finishing of complex surfaces.In an alternating field,the periodic changes in current will cause the magnetic cluster used ...A magnetic abrasive finishing process using an alternating magnetic field is proposed for the finishing of complex surfaces.In an alternating field,the periodic changes in current will cause the magnetic cluster used as a magnetic brush to fluctuate,which will not only continuously replace the abrasive particles in contact with the workpiece,but also periodically adjust the shape of the magnetic cluster to better fit the surface of the workpiece.In this paper,the influence of a combination of alternating and static magnetic fields on the magnetic field in the finishing area is analyzed.The feasibility of this process for finishing micro-grooves is investigated.Simulations and experimental measurements show that the combination of alternating and static magnetic fields can retain the advantages of the alternating field while increasing the magnetic flux density in the finishing area.The experimental results show that the process is feasible for finishing micro-grooves,with an excellent deburring effect on the groove edges.展开更多
基金the State International Science and Technology Cooperation Special Items(Grant No.2015DFA11700)the Natural Science Foundation of Guangdong Province(Grant No.2015A030308011)+1 种基金the Frontier and Key Technology Innovation Funds of Guangdong Province(Grant Nos.2014B090919002,2016B090911002,2017B090910002,2017B090910008)the Program of Foshan Innovation Team of Science and Technology(Grant No.2015IT100072).
文摘The phenomenon of burring is common in the manufacturing of metal parts.This phenomenon directly influences the assembly accuracy and service performance of the mechanical parts.In this work,we propose a vision⁃based method for two⁃dimensional planar workpiece.The proposed technique has the ability to recognize burr contour and generate the coordinate sequence in real⁃time along x and y directions.The robotic deburring efficiency is improved based on the quantitative information of the burr size.First,by utilizing the local deformable template matching algorithm,we match the standard workpiece contour with the workpiece contour to be processed and compute the corresponding pixels distance between the two contours.Second,we set the distance thresholds in order to divide the burr contours into different levels.We extract the coordinates of the burr contours and map them to the standard workpiece contour.As a result,the closed⁃loop robotic deburring path sequence is generated.Finally,on the basis of the quantitative information of burr size,we adjust the deburring speed in real⁃time during the deburring process.The experiments performed in this work show that the deburring time of the proposed method is reduced by 15.45%,as compared with the conventional off⁃line programming deburring methods.Therefore,for industrial mass production,the deburring efficiency is greatly improved.
文摘This paper aims to give an insight into the development and evaluation of force controlled machining processes with a commercially available setup. We will focus on a deburring and a grinding scenario, representing the major applications in today’s robot machining. Whereas the deburring use-case implements a force dependent feed-rate control, the grinding use-case implements an orthogonal force (pressure) control. Both strategies will be evaluated and the influence of general machining and robot specific parameters will be discussed.
基金supported by National Natural Science Foundation of China(No.51571114)Natural Science Foundation of Jiangsu Province,China(No.BK20130935)
文摘In an appropriate electrochemical environment, the discrete thermal electron emission could be induced in the micro area due to the uneven distribution of electron flux on the anode surface. Thus an oxygen molecule could be ionized at the liquid-solid interface after collision, and then oxygen plasma with distribution characteristics would be formed. The plasma electrolytic oxidation（PEO） could happen at the liquid-solid interface. In this work, the low carbon steel was used to study the deburring process by PEO at a high frequency（70000 Hz）pulse DC mode. Its burr height H from 3.23 mm to 0.04 mm was removed to form a smooth surface within 6 min. The values of corrosion potential and current density for the untreated sample were -0.667 V and 6.735×10^（-5）A/cm^2, respectively. But for the treated sample, the corrosion potential and current density were relatively lower,-0.354 V and 1.19×10^（-7）A/cm^2.Therefore, PEO was expected to be a new deburring method of carbon steel for the material processing field.
基金supported by the National Key R&D Program of China(Grant No.2018YFB2002200)
文摘Deburring of high-precision components to their micrometer features without any damage is very important but of great difficulty as the burr-to-functionality size ratio increases. To this end, this paper proposes a new deburring method in which the micro burr should be directly removed based on ultraprecision cutting with the designed monocrystalline diamond tool. To determine the feasibility of the proposed method, this paper applies it for deburring of the precision working edge of the servo valve core. Firstly, the monocrystalline diamond tool is carefully designed by covering a variety of topics like rake angle,clearance angle, edge radius. Then, the finite element(FE) simulation was conducted to characterize the deburring performance during the removal of the micro burr produced by the single abrasive grinding. Finally, an innovative self-designed deburring system was introduced and the deburring process was evaluated in terms of cutting forces, temperatures, tool wear mechanisms and deburring quality of the working edges by experiments. The FE simulation results indicate the suitability of the proposed deburring method. Meanwhile, the experimental findings agree well with simulation results and show that ultraprecision cutting with the specialized monocrystalline diamond tool could be successfully used for deburring of servo valve core edge without any damage. This work can provide technical guidance for similar engineering applications, and thus brings an increase to the machining efficiency for the manufacture of precision components.
文摘In this paper, a new forming model of the feed direction burr for drilling process is presented. The feed direction burr formation is experimented and studied. The related theories are analyzed, and the influential factors of the feed direction burrs are pointed out. Furthermore, a certain number of new measures to prevent and decrease the burr in drilling process are advanced.
文摘A magnetic abrasive finishing process using an alternating magnetic field is proposed for the finishing of complex surfaces.In an alternating field,the periodic changes in current will cause the magnetic cluster used as a magnetic brush to fluctuate,which will not only continuously replace the abrasive particles in contact with the workpiece,but also periodically adjust the shape of the magnetic cluster to better fit the surface of the workpiece.In this paper,the influence of a combination of alternating and static magnetic fields on the magnetic field in the finishing area is analyzed.The feasibility of this process for finishing micro-grooves is investigated.Simulations and experimental measurements show that the combination of alternating and static magnetic fields can retain the advantages of the alternating field while increasing the magnetic flux density in the finishing area.The experimental results show that the process is feasible for finishing micro-grooves,with an excellent deburring effect on the groove edges.
