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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society of Manufacturing Process Engineers
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Journal DOI :
The Korean Society of Manufacturing Process Engineers
Editor in Chief :
Volume & Issues
Volume 12, Issue 6 - Dec 2013
Volume 12, Issue 5 - Oct 2013
Volume 12, Issue 4 - Aug 2013
Volume 12, Issue 3 - Jun 2013
Volume 12, Issue 2 - Apr 2013
Volume 12, Issue 1 - Feb 2013
Selecting the target year
Hybrid Processes in View of Materials, Machining, and Joining
Gang, Myeong-Chang ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 6, 2013, Pages 1~2
DOI : 10.14775/ksmpe.2013.12.6.001
Material properties and machining performance of CNT and Graphene reinforced hybrid alumina composites for micro electrical discharge machining
Sung, Jin-Woo ; Kim, Nam-Kyung ; Kang, Myung-Chang ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 6, 2013, Pages 3~9
DOI : 10.14775/ksmpe.2013.12.6.003
) ceramics are excellent candidates for such applications due to their outstanding mechanical, thermal, and tribological properties. However, they are difficult to machine using conventional mechanical methods. Carbon fillers, such as carbon nanotubes(CNT) and graphene nanoplatelets(GNP)can be dispersed in a ceramic matrix to improve the mechanical and electrical properties. In this study, CNT and Graphene reinforced hybrid ceramic composites were fabricated using the spark plasma sintering method at a temperature of
, pressure of 40 MPa, and soaking time of 10min. Besides this, the material properties such as microstructure, crystal structure, hardness, and electrical conductivity were analyzed using FE-SEM, XRD, Vickers, and the 4-point probe method. A micro machining test was carried out to compare the effects of the material properties and the machining performance for CNT and Graphene reinforced ceramic composites.
Development of Hybrid Machining System and Hybrid Process Technology for Ultra-fine Planing and Micro Punching
Kim, Han-Hee ; Jeon, Eun-Chae ; Cha, Jin-Ho ; Lee, Je-Ryung ; Kim, Chang-Eui ; Choi, Hwan-Jin ; Je, Tae-Jin ; Choi, Doo-Sun ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 6, 2013, Pages 10~16
DOI : 10.14775/ksmpe.2013.12.6.010
Ultra-fine planing and micro punching are separately used for improving surface roughness and machining dot patterns, respectively, of metal molds. If these separate machining processes are applied for machining of identical molds, there could be an aligning mismatch between the machine tool and the mold. A hybrid machining system combining ultra-fine planing and micro punching was newly developed in this study in order to solve this mismatch; hybrid process technology was also developed for machining dot patterns on a mirror surface of a metal mold. The hybrid machining system has X, Y, and Z axes, and a cam axis for ultra-fine planing. The cam axis and attachable and removable solenoid actuators for micro punching can make large and small sizes of dot patterns, respectively. Ultra-fine planing was applied in the first place to improve the surface roughness of a metal mold; the measured surface roughness was about 20nm. Then, micro punching was applied to machine dot patterns on the same mold. It was possible to control the diameter of the dot patterns by changing the input voltage of the solenoid actuator. Before machining, severe inhomogeneous plastic deformation around the machined dot patterns was also removed by annealing heat treatment. Therefore, it was verified that metal molds with dots patterns for optical products can be machined using a hybrid machining system and the hybrid process technology developed in this study.
Fabrication of Microcellular Polyimide Film using Hybrid Laser Process with Chemical Blowing Agents
Ma, Yong Won ; Kang, Moon Suk ; Oh, Jae Yong ; Shin, Bo Sung ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 6, 2013, Pages 17~22
DOI : 10.14775/ksmpe.2013.12.6.017
Recently, microcellular polymer films have been widely used as absorbents, support cells, and sensors in the industrial fields of IT, NT, BT, and ST. The conventional fabrication methods of microcellular polymer films are not only more complicated than those of non-microcellular polymer films, but also require a longer production time. In this paper, we propose a new hybrid fabrication method for microcellular polymer films; films can be rapidly made using UV laser processing with chemical blowing agents. The experimental results show that the number of the micropores increased with respect to the laser fluence and the concentration of the chemical blowing agents.
Comparison of Ablation Characteristics of Carbon Nanotube reinforced Hybrid Al
by using Ultrashort Pulse Laser
Lee, Jun-Young ; Yoon, Ji-Wook ; Kang, Myung-Chang ; Cho, Sung-Hak ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 6, 2013, Pages 23~29
DOI : 10.14775/ksmpe.2013.12.6.023
In this paper, pure
and hybrid carbon nanotube reinforced
were sintered using the SPS(spark plasma sintering) method for high densification. A nanosecond laser (
) and a femtosecond laser (
) were installed on an optical system for the micromachining test. The ablation characteristics of the pure
composites, such as thermal effect and ablation depth, were investigated using FE-SEM and a confocal microscope device. Laser machining results for the two mating materials showed improved performances: CNT/
composites showed good surface morphology of hole drilling without a melting zone due to the composites' high thermal properties; also, the ablated depth of CNT/
was higher than that of pure
Characteristics of Tool Wear and Surface Roughness using for Hybrid Lubrication in Micro-Milling Process of Flexible Fine Die
Kim, Min-Wook ; Ryu, Ki-Teak ; Kang, Myung-Chang ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 6, 2013, Pages 30~36
DOI : 10.14775/ksmpe.2013.12.6.030
An FFD(flexible fine die) is an embossed mold that consists of a thin plate ranging from 0.6 to 3 mm in thickness. FFDs are primarily used for cutting LCD films and F-PCB sheets. In the high-speed micro-milling process of flexible fine dies, the lubrication and cooling of the cutting edges is very important from the aspect of eco machining and cutting performance. In this paper, a comparative study of tool wear and surface roughness between cutting fluid and hybrid lubrication for eco-machining of FFD was conducted for processes of high-speed machining of highly hardened material (STC5, HRC52). Especially, the incorporated fluid method for eco machining, in which the cutting performances can be simultaneously measured, was introduced. The machining results show that hybrid lubrication, instead of conventional cutting fluid, leads to excellent tool wear and surface roughness and represents the proper conditions for eco micro-machining of flexible fine dies.
New technology Trends on Friction Stir Welding Based on Milling Process in terms of Tools, Machine and Applied Parts
Noh, Joong-Suk ; Kim, Ju-Ho ; Go, Gun-Ho ; Kang, Myung-Chang ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 6, 2013, Pages 37~44
DOI : 10.14775/ksmpe.2013.12.6.037
Friction stir welding (FSW) is a solid state joining technique that has expanded rapidly since its development in 1991 and has numerous applications in a wide variety of industries. This paper introduces the basic principles of friction stir welding (FSW) and presents a survey of the latest technologies and applications in the field. The basic principles that are discussed include the terminology, tool/workpiece processes, FSW merits and process variants. In particular, the process variants including the rotation speed and traveling speed are discussed, which include the defect-free zone in an oxygen free copper and Al alloy, respectively. Multiple aspects of the FSW machine are developed, including a horizontal 2D FSW machine and a hybrid complex FSW machine. The latest applications are introduced, with an emphasis on the recent advances in the aerospace, automotive, and IT display industries. Finally, the direction for future research and potential applications are examined.
Effect of Welding Condition and Tool Shape on Defect Formation of Extruded AA6005 with Non-uniform Thickness using Load-Controlled Friction Stir Welding Technique
Yoon, Tae-Jin ; Kang, Myung-Chang ; Jung, Byong-Ho ; Kang, Chung-Yun ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 6, 2013, Pages 45~51
DOI : 10.14775/ksmpe.2013.12.6.045
Friction stir welding using aluminum alloys has been widely applied for transportation vehicles because of the light specific weight, which can be used to obtain sound joint and high mechanical properties. This study shows the effects of rotation speed, welding speed, welding load, and tool shape on defect formation with extruded AA6005, which is used for railway vehicle structures of non-uniform thickness welded by friction stir welding using load control systems. Optical microscopy observations and liquid penetrant testing of each FSW joint were carried out in order to observe defect formation. Two kinds of defects, that of probe wear and that of lack of penetration in the bottom of the welded zone, were observed. In the case of using a taper shaped tool, the defect free zone is very narrow, within 100 kgf; however, in case of using a cylindrical shape tool, the defect free zone is wider.
Durability Evaluation by Strength due to Load Direction of Press in Common Use
Cho, Jae-Ung ; Han, Moon-Sik ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 6, 2013, Pages 52~59
DOI : 10.14775/ksmpe.2013.12.6.052
In this study, strength and durability are investigated using structural and vibration analyses on models 1 and 2 of a press in common use. Model 1 has a structure in which a punch is applied from the upper part to the lower part; however, model 2 a structure in which a punch is applied from the lower part to the upper part. Maximum displacements of models 1 and 2 are 0.018184 mm and 0.025498 mm, respectively. Maximum equivalent stresses of models 1 and 2 are 14.144 MPa and 18.58 MPa respectively. Maximum displacements are shown for the punches of both models; model 1 has less deformation than model 2. Model 1 has more durability than model 2, as determined by an investigation of the structural strength. Using natural frequency analysis, model 1 was found to have maximum deformation in the upper part of punch. Mode1 2 has its maximum deformation in the column part of the body and the upper part of the fixed pin. Using harmonic stress analysis, the maximum deformations were found on the punch part and column part of the body in the cases of models 1 and 2, respectively. As the maximum total deformation and equivalent stress in the case of model 2 are shown to become 40 times those values of model 1, the vibration durability of model 2 can be seen to be weaker than that of model 1.
Study on Performance Experiment and Analysis of Aluminum Disc Brake
Ryu, Mi-Ra ; Lee, Dae-Hee ; Lee, Seong-Beom ; Park, Jeong-Ho ; Shim, Jae-Joon ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 6, 2013, Pages 60~68
DOI : 10.14775/ksmpe.2013.12.6.060
The present research aims to develop aluminum disc brakes to replace existing cast iron disc brakes in automobiles. The foundation for developing an aluminum disc is laid by investigating the performance characteristics of existing cast iron disc brakes and comparing those characteristics with those of aluminum disc brakes. This study involves FEM thermal/structural analysis of disc materials and experimental tests using a brake dynamometer. The results of this study show that, aluminum discs have not only better thermal/mechanical properties than existing cast iron discs, including better heat, wear, and crack resistance, but also that aluminum discs. Weigh less than existing cast iron discs, which results in improved maneuverability. Aluminum discs will become a more essential part of automobiles as electric cars become the major means of transportation.
A Study on the Flow Control Forming Process and Experiment Device of Drum Clutch for Automatic Transmission
Park, Jong-Nam ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 6, 2013, Pages 69~76
DOI : 10.14775/ksmpe.2013.12.6.069
This paper presents the development of the FCF method for the manufacturing of final products using numbers related to the minimum amount of work. The utilized product is a drum clutch, which is part of the transmission of an automobile. A double acting press is secured first and a prediction of the forming load on the practical material is made through an experiment with a plasticine model. Also, a finite element simulation using product shape and properties is performed, as well as a press experiment. A double acting press is manufactured that is suitable for a double acting experiment with a conventional hydraulic press(200 tons). A peripheral device for the press is additionally designed for experimental purposes. And, the press has as its essential points the drive speed, stroke control, etc., all of which influence the forming and is modified. Especially, a laser system is used for velocity measurement of two punches. The forming load of a practical material is predicted in order to derive a forming load formula for cold conditions on the basis of approximate similarity theory. Finite element analysis of the relative velocity ratio(RVR), etc., for most suitable flow defect(unfilling, etc.) prevention is achieved as well. The results are verified through a press experiment.
Bending Optimization of Archwire for Orthodontics Considering the Nonlinearity of Periodontal Ligament
Heo, Ji-In ; Lee, Kwon-Hee ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 6, 2013, Pages 77~83
DOI : 10.14775/ksmpe.2013.12.6.077
Orthodontics is a branch of dentistry that is concerned with the study and treatment of malocclusion, which may result from tooth irregularities, disproportionate jaw relationships, or both. Orthodontic devices consist of brackets, archwire connected to each bracket, and bends and hooks for auxiliary functions. Basically, orthodontics involves the interaction of brackets and archwire. It should be noted that uncontrolled tipping can occur due to unwanted movement of the teeth. The bending of an archwire can control the angle of an archwire and the rotation of a tooth. In this study, we predict the relationship between the bending angle of an archwire and the rotation of a tooth using the Kriging interpolation method. Also, we calculate the angle of an archwire that occurs at the minimum value of tooth rotation.
Progressive Process planning and die design to improve the formability in fine blanking of the lock plate in car seatbelt
Lee, Sang-Pill ; Min, Byung-Hyun ; Lee, Kwan-Young ; Ko, Young-Jun ; Kim, Chul ; Kim, Chang-Ho ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 6, 2013, Pages 84~92
DOI : 10.14775/ksmpe.2013.12.6.084
This study improves the formability in fine-blanking the lock plate of car seat belts using a low carbon steel(SM35C) plate. The optimal die design for the forming process is proposed using rules for process planning based on theories and field experiences. The optimal design is analyzed using commercial finite element software in order to solve the fracture problems in the extrusion process. Through the improved layout based on the FEM results, the fracture of the extruded part and the roll over problem are solved. Furthermore, it is demonstrated through the shown from experiments that the extruded part does not break in the modified die.
Development Process of Monocoque Frame for Hybrid Bicycle using Bolt Fastening
Lee, In-Chul ; Jang, Dong-Hwan ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 6, 2013, Pages 93~100
DOI : 10.14775/ksmpe.2013.12.6.093
This paper presents the development process for a bicycle monocoque frame using bolt fastening. Traditionally, bicycle frames have been constructed with metal tubes joined at their ends by welding. These frames have been brazed or soldered onto metal lugs, forming the frame. Because stress loads become greatest at the joint of the bicycle tube frame, joint construction strongly influences frame design and construction. To avoid the inherent problems of material discontinuity at frame joints, numerous designers have attempted to reduce or eliminate the number of joints in tube frames. Nevertheless, the manufacture of high quality, reliable, one-piece and jointless frames has proven difficult and expensive. In this study, a new monocoque frame adapted to a hybrid bike is proposed. The advantage of the monocoque frame, is theat is has a rechargeable battery system that is built into the frame; as a result, the emotional quality for the customer is improved. In order to estimate the design compatibility compared with that of tube frames, structural analysis is performed using finite element method. A prototype based on a modified design has also been made and stability testing has been carried out.
A Study on Contact Characteristics by the Geometry Variation of Beam Seal Fitting of an Aircraft Fuel Hose
Jeon, Jun-Young ; Kim, Byung-Tak ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 6, 2013, Pages 101~108
DOI : 10.14775/ksmpe.2013.12.6.101
An aircraft fuel hose is a kind of high pressure hose, and generally consists of a nipple, a socket, an inner tube, and a reinforcement layer to increase the tensile strength. Especially the nipple supports the other components in manufacturing stages such as the swaging or crimping processes however, the nipple also serves to prevent leakage in cases of hose engagement with a hydraulic system. To ensure the seal of the hose assembly, a beam seal fitting with metal-to-metal contact is usually adopted at the end of a nipple. Therefore, the geometry of the beam is an important parameter to be determined to make sure there is sufficient contact force. This study aims to investigate the effects of beam seal geometry on the contact force by changing the inclined angle and the thickness of the beam. The results reveal that the proper thickness and inclined angle of the beam seal are 0.45 mm and
Design Alteration of a All in One PC for the Improved Stability
Kim, Dong Wook ; Ro, Seung Hoon ; Kim, Geon Hyeong ; Yang, Yong Jun ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 6, 2013, Pages 109~116
DOI : 10.14775/ksmpe.2013.12.6.109
Vibrations are generally recognized as the biggest concern in maintaining part' longevity of an All-in-one PC. The vibrations in PCs originate from excitation sources such as the HDD and the cooling fan. In this study, the vibrations from these sources were investigated in order to analyze the individual effects of the parameters on the structural vibrations of the PC; further, we attempted to establish design alterations that could successfully suppress vibrations, in order to achieve improved stability and part' longevity. The results show that relatively simple design alterations can substantially improve the stability of PCs.
Development of Precision Instrument for attaching Micro-structure(Glass Bead) on the AFM cantilever
Park, C.H. ; Chae, Y.H. ; Kweon, H.K. ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 6, 2013, Pages 117~124
DOI : 10.14775/ksmpe.2013.12.6.117
Recently, the cell adhesion phenomenon that occurs in or between cells and other substances has become an important field of research in biology and biomedical engineering. Among the research, the foundational studies primarily experiment using biomedical materials (e.g. Glass Beads) attached to an AFM cantilever. For cell adhesion research, the mechanism where biomedical materials can be attached to the cantilever must be developed for this purpose; however, the mechanism remains an insufficient step. In this paper, a new stage where the Glass Bead can be attached to the cantilever is designed and fabricated;, the mm range movement in the stage is controlled using the stepping motor with a minimum displacement of
. The adhesive flow is also controlled using a PZT actuator. In addition, through the air suction, the cantilever holder can be fixed to the stage. The new stage including the bond inflows mechanism is evaluated and analyzed using theory and experiments.
A Study for Development of a Marine Diesel Engine from a 500Ps Commercial Vehicle Diesel Engine
Sim, Han-Sub ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 6, 2013, Pages 125~131
DOI : 10.14775/ksmpe.2013.12.6.125
This study was carried out to develop a diesel engine for marine propulsion. This marine diesel engine was developed based on a 500Ps vehicle diesel engine. Many main parts, such as the intercooler, radiator, and engine controller were designed for the marine diesel engine. The intercooler was designed to be of sea water cooling type; inlet air is cooled by sea water. Engine coolant is cooled by sea water in the radiator too. The water cooling heat exchanger has high cooling performance. In the cooling system, consists of the intercooler and the radiator, the sea water passes through the intercooler and then the radiator, in sequence. This process is very effective compared to the reverse method in which sea water passes through the radiator and then the intercooler, in sequence. The control performance of the engine controller and the fuel injection rate were improved using an engine speed controller. This system was tested on an engine dynamometer and an exhaust gas analyzer using the marine diesel engine test method. Test results show that the 500Ps marine diesel engine satisfied the IMO NOx regulations; Tier II.
A Study on the Development of a Specialized Prototype End-Effector for RDSs(Robotic Drilling Systems)
Kim, Tae-Hwa ; Kwon, Soon-Jae ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 6, 2013, Pages 132~141
DOI : 10.14775/ksmpe.2013.12.6.132
Robotic Drilling Systems(RDSs) set the standard for the factory automation systems in aerospace manufacturing. With the benefits of cost effective drilling and predictive maintenance, RDSs can provide greater flexibility in the manufacturing process. The system can be easily adopted to manage very complex and time-consuming processes, such as automated fastening hole drilling processes of large aircraft sections, where it would be difficult accomplished by workers following teaching or conventional guided methods. However, in order to build an RDS based on a CAD model, the precise calibration of the Tool Center Point(TCP) must be performed in order to define the relationships between the fastening-hole target and the End Effector(EEF). Based on the kinematics principle, the robot manipulator requires a new method to correct the 3D errors between the CAD model of the reference coordinate system and the actual measurements. The system can be called as a successful system if following conditions can be met; a. seamless integration of the industrial robot controller and the IO Level communication, b. performing pre-defined drilling procedures automatically. This study focuses on implementing a new technology called iGPS into the fastening-hole-drilling process, which is a critical process in aircraft manufacturing. The proposed system exhibits better than 100-micron 3D accuracy under the predefined working space. Based on the proposed EEF fastening-hole machining process, the corresponding processes and programs are developed, and its feasibility is studied.
Development of Automative Program for Designing Involute Spur Gear
So, Jung-Duk ; Jung, Sung-Won ; Kwon, Soon-Goo ; Park, Jong-Min ; Choi, Won-Sik ; Kim, Jongsoon ; Kwon, Soon-Hong ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 6, 2013, Pages 142~151
DOI : 10.14775/ksmpe.2013.12.6.142
This study develops an automation system for metallic mold design that is applicable in forging non-axial symmetric parts. The metallic mold design program is used to design the metallic mold using two-dimensional axial symmetric metallic molds and to predict the stress concentration using finite element analyses. Then, the program redesigns the metallic mold using variables such as the optimal split diameter, maximum allowable inner pressure, fit tolerance, and stress distribution, which are calculated using the metallic mold design program. When the involute spur gear is forged, stress concentration occurs on the tooth root bounded at the symmetric surface. The SCM4 material is suitable for metallic molds because the stress is less than the yield strength of the insert and it acts on the tooth root regardless of the inner pressure. The metallic mold for forging non-axial symmetric parts can be designed through adjusting the magnitude of the contact pressure. The program developed in this study can be applied to metallic mold designs in involute spur gears of forging, which is an ordinary non-axial symmetric part.
Cooling Performance Study of a Impinging Water Jet System with Heat Sink for High Power LEDs
Ku, G.M. ; Kim, K. ; Park, S.H. ; Choi, S.D. ; Heo, J.W. ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 6, 2013, Pages 152~158
DOI : 10.14775/ksmpe.2013.12.6.152
The purpose of this study is to investigate cooling performance of high power LEDs from 100 to 200 W class by using a jet impingement cooling module. The numerical analysis of forced convection cooling inside cooling module is carried out using a multi-purpose CFD software, FLUENT 6.3. In the experiments, the LED cooling system consists of jet impingement module, heat exchanger, water reservoir, and pump. In the present study, the cooling performance of jet impingement cooling module is investigated to determine the effect of the heat sink types on the impinging surface, the space and length of fins. Numerical and experimental studies show the reasonable agreement of LED metal PCB temperature between those results and give the optimized design parameters such as the space of fin and the length of fin. Also, the pin fin type of heat sink is found to be more efficient than the plate type heat sink in jet impingement cooling.
A Study on the Optimum Shape of MQL Carbide End-mill for Machining of Aluminum Lithium Alloy
Lee, In-Su ; Kim, Hae-Ji ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 6, 2013, Pages 159~166
DOI : 10.14775/ksmpe.2013.12.6.159
In order to develop the optimum shape of an MQL carbide end-mill suitable for high speed machining of wing ribs which are a detailed part of larger wing structures, using a new material Al-Li alloy, a new MQL carbide end-mill is created that has various quantities of holes, hole sizes, and hole locations. A theoretical machining graph is generated using the hammer test and FRF simulation, and a machining test is performed in order to verify the machining stability in the high speed machining area. The optimum configuration of the MQL carbide end-mill is also presented through comparing the chattering, machining noise and cutting conditions, including the maximum cutting depth, rpm, and feed rate per teeth, for each cutter.
A Study on the Optimal Design for a Magnetic Bearing-Rotor with Maximum Stiffness using a Genetic Algorithm
Kim, Chae-Sil ; Jung, Hoon-Hyung ; Park, Bong-Kwan ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 6, 2013, Pages 167~174
DOI : 10.14775/ksmpe.2013.12.6.167
High speed rotor systems with magnetic bearings have been the subject of much research in recent years due to the potential for active vibration control. In this thesis, optimal design was conducted for an 8-pole heteropolar magnetic bearing used in the flexible rotor of a turbo blower. In connection with bearing stiffness, this optimal design process was conducted using a genetic algorithm(GA), which is based on natural selection and genetics. The maximum stiffness of the magnetic bearing-rotor was found by considering the critical speeds of the flexible rotor. As a result, the magnetic bearings were optimized to have maximum stiffness.
A Study on Simulation of Chip Recycling System for the Management of Cutting Chip in 5-Axis FMS Line
Lee, In-Su ; Kim, Hae-Ji ; Kim, Deok-Hyun ; Kim, Nam-Kyung ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 6, 2013, Pages 175~181
DOI : 10.14775/ksmpe.2013.12.6.175
The primary element of machining automation is to maximize the utilization of machine tools, which determines the output and lead-time. In particular, 95% of raw materials for wing ribs are cut into chips and 0.6 ton of chips are generated every hour from each machine tool. In order to verify the chip recycling system that controls the chips from the machines in five-axis FMS line, a simulation of the virtual model is constructed using the QUEST simulation program. The optimum speed of the chip conveyor and its operating conditions that directly affect the efficiency of the FMS line are presented including the chip conveyor speed, the maximum capacity of the hopper, and the number of chip compressors.