The Experts below are selected from a list of 315 Experts worldwide ranked by ideXlab platform
Sung Lim Ko - One of the best experts on this subject based on the ideXlab platform.
-
new abrasive Deburring method using suction for micro burrs at intersecting holes
Cirp Annals-manufacturing Technology, 2016Co-Authors: B C Kwon, Sung Lim KoAbstract:Abstract As industrial technology advances functionally, there is an increasing necessity to treat edges of products well to satisfy the required function. Specifically, burrs inside products at intersecting holes are very difficult to remove because the accessibility of the burr location inside the product to tools is very limited. We propose a new Deburring method called abrasive Deburring. This method uses a pipe with a hole as a Deburring tool to move water with an abrasive and a pump for suction. To determine the suitability of the proposed Deburring method, abrasives with different sizes and specific gravities are used. The geometry of the tool and the operating conditions were specified using the following parameters: the diameter of the crossing hole, the diameter of the suction tool, the gap between the sample hole and the tool, the pressure of the pump, and the location of the hole of the tool. The suction-Deburring method was very useful for removing micro burrs formed at intersecting holes with an appropriate pump pressure, which is not as high as that in the water-jet or extrude-hone method. However, given the limited Deburring force, the method is only applicable for removing micro burrs; other burrs are reduced to stable burrs, which do not require removal from the product.
-
Development of Deburring tool for burrs at intersecting holes
Journal of Materials Processing Technology, 2008Co-Authors: Sung Lim KoAbstract:Most recently manufactured automobile and hydraulic parts contain intersecting holes. However, there has been no efficient Deburring method for burr at intersecting holes, which has been a significant machining challenge. An experiment was performed to analyze how Deburring can be efficiently carried out at the intersecting hole. Most of the results were good on the flat exit surface using the usual Deburring tool. But in the case of inclined exit surface and intersecting hole, Deburring did not work so well. To simulate the surface at the intersecting holes, a Deburring experiment on inclined exit surface was carried out. Because a majority of Deburring tools have an edge for unidirectional rotation for Deburring, the Deburring operation was performed successfully only on some parts of the exit edges of holes in the case of inclined exit surface. Contrary to the flat surface and inclined exit surface, the intersecting hole has variations in terms of inclined angle around the hole with different burr heights. Therefore, most burrs at intersecting holes are difficult to remove. An experiment was performed to compare the Deburring capability of each tool, namely the burr-off tool and Beier tool. The burr-off tool is used for general burrs that were formed on flat exit surfaces, whereas the Beier tool is a special equipment for high-speed Deburring. According to the result, a new efficient Deburring method as well as a new Deburring tool design was proposed. Each parameter was analyzed to improve the Deburring performance. Burr geometry was analyzed using the burr measurement system, which was separately developed.
-
micro Deburring for precision parts using magnetic abrasive finishing method
Journal of Materials Processing Technology, 2007Co-Authors: Sung Lim Ko, Yuri Mikhailovich Baron, Jung Il ParkAbstract:Abstract Using the developed electromagnetic inductor for Deburring micro burr, more detail characteristics of the performance are analyzed. Experiments were carried out to verify the influence of each conditions: volume of powder, height of gap, rotational frequency of the inductor and feed velocity. Proper Deburring conditions are suggested to satisfy the productivity and the accuracy. In addition to Deburring efficiency, the influence to surface roughness is analyzed. To improve the surface roughness and impurity, a method of coolant supply and component of abrasive powder are investigated. It is proved that the continuous flow of coolant and the Fe powder without abrasive is effective for Deburring and surface quality.
-
Effective Deburring of Micro Burr Using Magnetic Abrasive Finishing Method
Key Engineering Materials, 2005Co-Authors: Jung Il Park, Sung Lim Ko, Y.h. Hanh, Yuri Mikhailovich BaronAbstract:Micro burrs formed in micro parts are not subject to be removed by the conventional Deburring method for marco parts. Magnetic abrasive Deburring method which was proved to be effective for small burrs are applied for Deburring the micro burr in electric gun parts used in TV monitor. A specific magnetic inductor is designed and manufactured for this part. To improve the Deburring performance, vibration table is used for increasing the relative velocity. To evaluate the Deburring capability and surface finishing, edge shape, surface roughness and composition of surface material are measured precisely. It is verified the chemical composition of surface is not affected by the powder composition when the proper powder are used with coolant.
-
Micro Deburring Technology Using Ultrasonic Vibration with Abrasive - eScholarship
2004Co-Authors: H Z Choi, Y J Choi, Sung Lim KoAbstract:Burrs have been defined as undesirable projections of material beyond the edge of a workpiece during machining. Burrs are created around the edge of workpiece due to plasticity during mechanical manufacturing process. Recently, because of miniaturization and increased precision of the machined parts, the size of burrs has been also reduced and Deburring became even more difficult. Generally, burrs have been removed by method of physics and chemistry. There are a few publications in the area of applying ultrasonics to Deburring. When ultrasonic vibration propagates in the liquid medium, a large number of bubbles are formed. These bubbles generate an extremely strong force, which removes burrs. The object of this study is to analyze the effects of ultrasonic vibration, medium and the type of abrasive in Deburring process. In this paper, we have examined such parameters of ultrasonic vibration as power, the distance between the ultrasonic horn and workpiece, Deburring elapsed time, and the type of abrasive. The different abrasives were used in this experiment to examine how the properties of the abrasives affect ultrasonic Deburring. It was found from the result that Deburring with ultrasonic cavitation in medium is effective to micro burr.
M.a. Elbestawi - One of the best experts on this subject based on the ideXlab platform.
-
Sensing and control for automated robotic edge Deburring
IEEE Transactions on Industrial Electronics, 1994Co-Authors: G.m. Bone, M.a. ElbestawiAbstract:This paper describes the sensing and control elements of a system for automated robotic edge Deburring. The Deburring path, automatically generated bp a task planner, is corrected on-line by an active end effector with the objective of controlling the chamfer depth. The sensing system combines the information from force and vision sensors during Deburring to provide an improved depth measurement. The vision sensor is then used to verify the Deburring performance during an inspection pass. The control system incorporates a new form of adaptive Generalized Predictive Control (GPC) combined with learning control, termed GPC with Learning (GPCL). The system is tested through computer simulations and Deburring experiments. The experiments were performed on steel parts with one-dimensional (1-D) and two-dimensional (2-D) edges. For the 1-D edges the depth's standard deviation measured on-line was 0.015 mm with nonadaptive GPC, 0.009 mm with adaptive GPC, and 0.006 mm with adaptive GPCL. With adaptive GPCL and the 2-D edge the deviation was 0.017 mm. This was confirmed by the inspection pass measurements which reported a mean of 0.39 mm and a deviation of 0.019 mm.
-
Sensing and control for automated robotic edge Deburring
Proceedings of the 1992 International Conference on Industrial Electronics Control Instrumentation and Automation, 1992Co-Authors: G.m. Bone, M.a. ElbestawiAbstract:The authors describe the sensing and control elements of a system for automated robotic edge Deburring. The Deburring path, automatically generated by a task planner, is corrected online by an active end effector with the objective of controlling the chamfer depth. The sensing system combines the information from force and vision sensors during Deburring to provide an improved depth measurement. The vision sensor is then used to verify the Deburring performance in an inspection pass. The control system incorporates adaptive predictive control combined with learning control. The system was tested through computer simulations, and Deburring experiments performed on one and two-dimensional edges.
G.m. Bone - One of the best experts on this subject based on the ideXlab platform.
-
Sensing and control for automated robotic edge Deburring
IEEE Transactions on Industrial Electronics, 1994Co-Authors: G.m. Bone, M.a. ElbestawiAbstract:This paper describes the sensing and control elements of a system for automated robotic edge Deburring. The Deburring path, automatically generated bp a task planner, is corrected on-line by an active end effector with the objective of controlling the chamfer depth. The sensing system combines the information from force and vision sensors during Deburring to provide an improved depth measurement. The vision sensor is then used to verify the Deburring performance during an inspection pass. The control system incorporates a new form of adaptive Generalized Predictive Control (GPC) combined with learning control, termed GPC with Learning (GPCL). The system is tested through computer simulations and Deburring experiments. The experiments were performed on steel parts with one-dimensional (1-D) and two-dimensional (2-D) edges. For the 1-D edges the depth's standard deviation measured on-line was 0.015 mm with nonadaptive GPC, 0.009 mm with adaptive GPC, and 0.006 mm with adaptive GPCL. With adaptive GPCL and the 2-D edge the deviation was 0.017 mm. This was confirmed by the inspection pass measurements which reported a mean of 0.39 mm and a deviation of 0.019 mm.
-
Sensing and control for automated robotic edge Deburring
Proceedings of the 1992 International Conference on Industrial Electronics Control Instrumentation and Automation, 1992Co-Authors: G.m. Bone, M.a. ElbestawiAbstract:The authors describe the sensing and control elements of a system for automated robotic edge Deburring. The Deburring path, automatically generated by a task planner, is corrected online by an active end effector with the objective of controlling the chamfer depth. The sensing system combines the information from force and vision sensors during Deburring to provide an improved depth measurement. The vision sensor is then used to verify the Deburring performance in an inspection pass. The control system incorporates adaptive predictive control combined with learning control. The system was tested through computer simulations, and Deburring experiments performed on one and two-dimensional edges.
Jae H. Chung - One of the best experts on this subject based on the ideXlab platform.
-
Application of an active pneumatic actuator to robotic Deburring
Industrial Robot-an International Journal, 2007Co-Authors: Jae H. ChungAbstract:Purpose – The paper aims to develop a robotic Deburring method based on a new active pneumatic tool.Design/methodology/approach – The paper presents a new active pneumatic tool, which is developed by integrating two industrial pneumatic Deburring tools based on a double cutting action – initial cut followed by fine cut. A simple control method is developed, which coordinates the motion of the tools and the arm.Findings – The study finds that the developed method can improve robotic Deburring in terms of speed and accuracy.Research limitations/implications – The paper provides guidance for the design of a pneumatic Deburring tool, its integration with an industrial robot, and robotic Deburring control.Practical implications – The new Deburring tool prevents large contact force and bouncing from occurring during the contact transition. In addition, the developed Deburring method demonstrates significant improvement in Deburring speed and accuracy in comparison with other methods, which is translated into co...
-
Modeling and Control of a New Robotic Deburring System
Journal of Manufacturing Science and Engineering-transactions of The Asme, 2007Co-Authors: Jae H. ChungAbstract:This paper discusses the modeling and control of a robotic manipulator with a new Deburring tool, which integrates two pneumatic actuators to take advantage of a double cutting action. A coordination control method was developed by decomposing the robotic Deburring system into two subsystems: the arm and the Deburring tool. A decentralized control approach was pursued in which suitable controllers were designed for the two subsystems in the coordination scheme. Robust feedback linearization was utilized to minimize the undesirable effect of external disturbances, such as static and Coulomb friction and nonlinear compliance of the pneumatic cylinder stemming from the compressibility of air. The developed coordination control method demonstrated its efficacy in terms of Deburring accuracy and speed. Simulation results show that the developed robotic Deburring system significantly improves the accuracy of the debarring operation.
-
Modeling and control of a new robotic Deburring system
Robotica, 2005Co-Authors: Jae H. ChungAbstract:This paper discusses the modeling and control of a robotic manipulator with a new Deburring tool, which integrates two pneumatic actuators to take advantage of a double cutting action. A coordination control method is developed by decomposing the robotic Deburring system into two subsystems; the arm and the Deburring tool. A decentralized control approach is pursued, in which suitable controllers were designed for the two subsystems in the coordination scheme. In simulation, three different tool configurations are considered: rigid, single pneumatic and integrated pneumatic tools. A comparative study is performed to investigate the Deburring performance of the Deburring arm with the different tools. Simulation results show that the developed robotic Deburring system significantly improves the accuracy of the Deburring operation.
In-hyu Choi - One of the best experts on this subject based on the ideXlab platform.
-
Electrochemical Deburring system using electroplated CBN wheels
International Journal of Machine Tools & Manufacture, 1998Co-Authors: In-hyu ChoiAbstract:Abstract Deburring and edge finishing technology as the final process of machining operation is required for manufacturing of advanced precise components. Fitting a Deburring process into FMS (flexible manufacturing system) with high efficiency and full automation is a difficult problem. There is no standardized procedure for the removal of burrs of various shapes, dimensions and properties and currently manual methods are used. In particular, Deburring of internal cross holes which are perpendicular to a main hole is more difficult and the electrochemical method is a potential solution. Therefore, it is needed to develop the electrochemical Deburring technology for internal Deburring in a cross hole shape. In this study, the mechanism of electrochemical Deburring by using electroplated cubic boron nitride (CBN) wheels is described and its Deburring performance is investigated in an internal cross hole. Also, Deburring efficiency for internal cross holes is examined with electrolytic currents and other electrochemical conditions. The optimum range of Deburring the internal cross hole corresponding to the acquired edge quality is determined.
-
A study of the characteristics of the electrochemical Deburring of a governor-shaft cross hole
Journal of Materials Processing Technology, 1998Co-Authors: In-hyu ChoiAbstract:Abstract Burr technology have been developed in the fields of precision manufacturing and high quality machining, but Deburring is considered a difficult problem for highly efficient production and automation in FMSs. The removal of burr does not have a standard definition because of its various shapes, dimensions and properties and because it depends mostly on manual treatment. The Deburring of internal cross holes, that are perpendicular to a main hole, is especially very difficult. The elimination of a burr from the cross hole of a governor shaft such as is used in the automobile engine, so far has been undertaken by manual post-processing by a skilled worker and becomes a factor in lower productivity and increased cost. Therefore, for high efficiency and automation of the internal Deburring of a cross hole, development of electrochemical Deburring technology is needed. In this study, the characteristics of electrochemical Deburring were identified through experiments and the main factors, such as electrolytic gap and electrolytic fluid, contributing to the elimination of a burr, were analyzed by the height of the burr. Also the Deburring efficiency and electrochemical performance for an internal cross hole were examined for different electrolytic current and Deburring conditions. Finally, the optimal conditions are determined corresponding to the required edge quality.
-
A study on the characteristics of electrochemical Deburring in the governor shaft cross hole
Transactions of The Korean Society of Mechanical Engineers A, 1997Co-Authors: In-hyu ChoiAbstract:Recently burr technology is rising in the fields of the precision manufacturing and the high quality machining, Deburring has treated as a difficult problem on going to the high efficiency, automation in the FMS. Removal of burr with various shapes, dimensions and properties couldn't be standardized and has depended on manual treatment. Especially, Deburring for cross hole inside owing to passing through out perpendicular to a main hole is more difficult, the electrochemical method is proper as its solution at practical aspects. Burr elimination in the cross hole drilling of governor shaft used in the automobile engine so far has been worked by a manual post-processing by a skillful worker, which becomes a factor of productivity-down and cost-up so that improvement of machining process is needed. Therefore, for the high efficiency and automation of internal Deburring in the cross hole, development of electrochemical Deburring technology is needed. So, the new process in the burr treatment is supposed. In this study, characteristics of electrochemical Deburring through experiments were identified and factors such as electrolytic gap and electorlytic fluid contributed to removal burr height were analyzed. Also, Deburring efficiency and electrolytic performance for cross hole were examined according to electrolytic current and electrochemical Deburring condition corresponding to acquired edge quality was found out.
