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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society for Precision Engineering
Journal Basic Information
Journal DOI :
Korean Society of Precision Engineering
Editor in Chief :
Volume & Issues
Volume 18, Issue 12 - Dec 2001
Volume 18, Issue 11 - Nov 2001
Volume 18, Issue 10 - Oct 2001
Volume 18, Issue 9 - Sep 2001
Volume 18, Issue 8 - Aug 2001
Volume 18, Issue 7 - Jul 2001
Volume 18, Issue 6 - Jun 2001
Volume 18, Issue 5 - May 2001
Volume 18, Issue 4 - Apr 2001
Volume 18, Issue 3 - Mar 2001
Volume 18, Issue 2 - Feb 2001
Volume 18, Issue 1 - Jan 2001
Selecting the target year
Kim, Seung-U ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 3, 2001, Pages 9~9
Dimensional Measurement Using the Machine Vision
Park, Hui-Jae ; Hwang, Yeong-Min ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 3, 2001, Pages 10~17
Three Dimensional Measurements Using Machine Vision
Lee, Sang-Yoon ; Lim, Ssang-Gun ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 3, 2001, Pages 18~22
Recent Developments in Machine Vision Research
Han, Seung-Hun ; Jang, Gi-Jeong ; Yun, Guk-Jin ; Cha, Jun-Hyeok ; No, Gyeong-Sik ; Gwon, In-So ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 3, 2001, Pages 23~34
Surface Characteristics of Cylindrically Ground Workpiece using Laminated Grinding Wheel
Kim, Min-Chul ; Kim, Kwang-Hee ; Lee, Eun-Jong ; Kim, Kang ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 3, 2001, Pages 35~39
The precision grinding process is carried out with fine-cutting operation after coarse-cutting operation. So, the laminated grinding wheel has been developed to reduce the ineffectiveness induced by changing the operations. In this study, to investigate the possibility of the practical use of the laminated grinding wheel, the surface residual stress of the workpiece ground by the laminated grinding wheels was compared with that ground by the general grinding wheel, and the influence of the difference in grain sizes, between the coarse grit and fine grit of the laminated grinding wheel, on the surface roughness of the workpiece was investigated.
Integrated Analysis for the Shrink-Fitted Die with Multi stress-Ring of Dissimilar Materials
Yoh, Eun-Gu ; Lee, Yong-Shin ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 3, 2001, Pages 40~46
An integrated analysis for the thermo-elastic deformation, fatigue, wear and brittle damage evolution of the shrink-fitted die with multi stress-ring of dissimilar materials is presented. A simple numerical algorithm for the moving elastic boundaries characterizing the contacts of the insert and multi stress-rings is presented. The initial stress distribution in the die due to shrink-fit is considered and the traction at the die surface contacting with the work piece is obtained by analyzing the elasto-plastic deformation of work piece. Elastic analysis of the separate-type die is performed and then the evolution of brittle damage, wear and fatigue life are predicted. This integrated analysis is applied to the extrusion die with two layers of stress-rings and the results are discussed in detail.
A Study on Manufacturing Process of Pattern with LOM System
Choi, Man-Sung ; Choi, Bae-Ho ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 3, 2001, Pages 47~52
Rapid Prototyping(RP) has been widely applied in designing and developing process of new products. RP can reduce the lead time and expense required to bring a new product form initial concept to production. Among several RP process can dramatically reduce the total build time and be applied for fabrication of large-sized and free form object because it uses in LOM the paper thickness is 0.05∼0.38mm as deposition feature segment. In this study, mechanical properties of pattern with LOM system is studied for optimal design of sand mold casting. The main result is that tensile, compressive strength and pattern size are significantly affected by temperature of hot roll.
Development of PC-NC Water Jet Cutting System and Cutting of Titanium
Choi, Byung-Mun ; Hong, Seong-Ki ; Ryuh, Beom-Sahng ; Park, Sang-Min ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 3, 2001, Pages 53~60
Water jet cutting is a new technology using very high pressure water as a cutting tool. Water jet cutting system consists of water preparation part, pressure generation pate, cutting head, and motion part. A PC-based numerical controlled (PC-NC) X-Y table is developed and water get cutting system is installed thereon. Water jet machining is applicable to various kinds of materials ranging from soft materials such as rubber and meat to hard-to-cut materials such as titanium. This paper shows the application of the abrasive waterjet system to titanium cutting
A Study on Improvement of Finishing Accuracy Using 3-Axis Machine for Curved Surface Dies
Lim, Dong-Jae ; Lee, Sang-Jik ; Jeong, Hae-Do ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 3, 2001, Pages 61~67
The finishing process for die is an important process because it has influence on final quality of products. Recently s study on development of 5-axis die automated finishing machine has been progressed. But die must be moved from the cutting machine to the die automated finishing machine. So manufacturing cost and time increase and machining error occurs by transfer. So, in this study, a 3-axis machining center was applied to die finishing. Because cutting tool can be changed to finishing tool by ATC, both of cutting and finishing process are possible on the machine. However, this application results in the decrease of finishing for the improvement of form accuracy. So this study focused on the generation of finishing tool path suitable to 3-axis die finishing for the improvement of form accuracy. The form accuracy evaluation is performed by the measurement of removal depth using a stylus profilometer. From the result, it is confirmed that form accuracy was improved less than 2
m of removal depth error.
Real-Time Lane Detection Based on Inverse Perspective Transform and Search Range Prediction
Jeong, Seung-Gweon ; Kim, In-Soo ; Kim, Sung-Han ; Lee, Dong-Hwoal ; Yun, Kang-Sup ; Lee, Man-Hyung ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 3, 2001, Pages 68~74
A lane detection based on a road model or feature all needs correct acquirement of information on the lane in an image. It is inefficient to implement a lane detection algorithm through the full range of an image when it is applied to a real road in real time because of the calculating time. This paper defines two (other proper terms including"modes") for detecting lanes on a road. First is searching mode that is searching the lane without any prior information of a road. Second is recognition mode, which is able to reduce the size and change the position of a searching range by predicting the position of a lane through the acquired information in a previous frame. It allows to extract accurately and efficiently the edge candidate points of a lane without any unnecessary searching. By means of inverse perspective transform which removes the perspective effect on the edge candidate points, we transform the edge candidate information in the Image Coordinate System(ICS) into the plan-view image in the World Coordinate System(WCS). We define a linear approximation filter and remove faulty edge candidate points by using it. This paper aims at approximating more correctly the lane of an actual road by applying the least-mean square method with the fault-removed edge information for curve fitting.e fitting.
Development of Hybrid RIM Mold to Form Outfit-part for Prototype-cars
Yang, Hwa-Jun ; Hwang, Po-Jung ; Lee, Seok-Hee ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 3, 2001, Pages 75~83
RIM(Reaction Injection Molding) is a widely used method to manufacture middle-large size outfit-part for a prototype car. The main advantage of RIM is the capability of manufacturing a small number of prototype parts with less cost and lead time than injection molding which is the most popular method to manufacture plastic parts. Generally, epoxy resin and RTV(Room Temperature Vulcanization) silicon are used as mold materials for RIM, and the selection of mold materials is usually depended upon the industrial environment of manufactures and it decides overall mold making process and part quality. This paper suggests a new mold making process by consolidating the advantages of epoxy resin and RTV silicon based RIM mold to enhance the parts quality while reducing the manufacturing cost and time and shows the competitiveness of the suggested process compared with conventional methods.
Dynamic Analysis of Railway Vehicle Having Single Axle Bogie
Yang, Hee-Joo ; Oh, Taek-Yul ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 3, 2001, Pages 84~89
Studied in this paper was the vehicle dynamics simulation for development of single axle bogie using the multi-body dynamics simulation program(VAMPIRE). Single axle bogie vehicle is to the crew of freight vehicle. Method of analysis for dynamic behaviors of vehicle having single axle bogie was carried by UIC(International Union of Railways) code 518 and results of analysis were presented in terms of the hunting stability and the derailment ratio and the sum of wheel/rail lateral force. The results of analysis meet the criteria proposed by UIC.
The Development of Exclusive Control Valve for Improving the Performance of Truck Cab Tilting System
Park, Sung-Hwan ; Lee, Jin-Kul ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 3, 2001, Pages 90~98
In this paper, the development of exclusive control valve for improving the performance of truck cab tilting system is discussed. Cab tilting system is implemented to the heavy truck for the convenience of driver. However when tilting up or down, sudden swing of cab has brought discredit on user. To improve this phenomena it is inevitable to use counter balance valve. But because of high pressure and low flow characteristic, general counter balance valve is unsuitable to cab tilting system. Therefore, this paper presents the developments of exclusive return pressure control valve which prevents sudden swing of cab and verify the validity of design through the computer simulation.
Analysis of Dynamic Performance of Model Tranis for Their Drive Train Design
Kim, Suc-Tae ; Yoon, Soon-Hyung ; Tak, Tae-Oh ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 3, 2001, Pages 99~106
Model trains should have very similar motion characteristics to real trains in order to provide realistic feeling to their operators. Main purpose of dynamic analysis of model trains is to predict velocities in straight and circular tracks and estimate stopping distance after power shut off. Equations of motion for a model train are derived that relates velocity, traction, rolling resistance, and pulling force. Also, energy equations for calculating stopping distance after power shut off are derived. Experiments with model trains are preformed to measure velocity, rolling resistance, slip, and stopping distance. The results are compared with the prediction based on the equations of motion, and they showed good agreement. It can be concluded that the prediction is more accurate when the slip between wheel and rail is accounted for. The analysis procedures can be applied to determining various design factors in model trains.
Evaluation of Head/Disk interface using TAA Signal
Park, Yong-Sik ; Lee, Jae-Mo ; Kim, Dae-Eun ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 3, 2001, Pages 107~114
The durability of head/disk interface is an important issue for hard disk drives. Currently, there are several means of assessing the performance and integrity of the head/disk interface. In this work Track Average Amplitude(TAA) signal was used to analyzed the head/disk interface with respect to variations in disk velocity, slider pre-load and preformed scratch on the disk. Particularly, TAA variation due to disk defect in the form of a scratch was investigated.
A Study on the Driving Principles of a Novel Non-contact Surface Actuator Using Combination of Magnetic Force
Jung, Kwang-Suk ; Baek, Yoon-Su ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 3, 2001, Pages 115~121
In micro automation technology, the concurrent realization of a high resolution and a large operating rage has been achieved by a dual actuator, usually called by piggy-back system, conventionally. But, because of its manufacturing cost, the complexity of control, and the limit of overall bandwidth, the contract-free and single servo actuators have been suggested with specific applications. In this paper, we suggest a novel non-contact surface actuator suing combination of the Lorentz force and the magnetized force, and discuss the actuating principles including an analytical approach. Differently from the existing planar system, an operating range of the suggested system can be expanded by an additional attachment of active elements. Therefore, it is estimated to be suitable for the next-generation moving system.
The Development of Tool for Evaluating Quantitative Independency between FRs in Axiomatic Design
Kang, Young-Ju ; Hwang, Yun-Dong ; Cha, Sung-Woon ; Jung, Dae-Jin ; Moon, Yong-Rak ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 3, 2001, Pages 122~130
Axiomatic Design is the useful tool for making a good design. In Axiomatic design, the independency is an important property to determine whether the design is good. Until now many designers decide the independency between FRs by their own decision. The way depending on inspiration is simple and fast, but it can not be considered as precise conclusion. Also there are not exact rule that evaluate the quantitative independency between FRs. This thesis will show the way to evaluated the quantitative independency of FRs from the comparison between FRs of more lower levels, and develop more efficient and objective tool in Axiomatic Design.
Precision of Iterative Learning Control for the Multiple Dynamic Subsystems
Lee, Soo-Cheol ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 3, 2001, Pages 131~142
A Reverse Kinematic Approach for Error Analysis of a Machine tool Using Hemispherical Helix Ball bar test
Yang, Seung-Han ; Kim, Ki-Hoon ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 3, 2001, Pages 143~151
Machine tool errors have to be characterized and predicted to improve machine tool accuracy. A real-time error compensation system has been developed based on volumetric error synthesis model which is composed of machine tool errors. This paper deals with new algorithm about verification of machine tool errors. This new algorithm uses a simplified volumetric error synthesis model. This simplified model is constructed with only main components among the error components of the machine. The main error components are analyzed by ball bar test of hemispherical helix. The novel measurement method using ball bar system has many advantages which are more efficient, easier to use than conventional measurement system.
An Ultraprecision Rotary Motor based on Inchworm-type Actuation
Kim, Sang-Chae ; Kim, Soo-Hyun ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 3, 2001, Pages 152~157
An ultraprecision rotary motor is developed using inchworm motion of two belts actuated by elongation of piezoelectric elements. A symmetric lever mechanism with flexure hinges is designed to connect belts with piezoelectric elements. The lever mechanism is used not only to amplify the elongation of piezoelectric element but also to minimize the numbers of components and the effort for assembly. By experiment, the rotational angle by one cycle is varied from
rad depending on input signal amplitude. Further, the motor has the capability of getting more precise rotational resolution by enlarging the radius of the rotor.
A Basic study on Development of Die Design System for Die Casting
Park, Joon-Hong ; Kwon, Taek-Hwan ; Choi, Jae-Chan ; Kim, Chang-Ho ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 3, 2001, Pages 158~168
Die design of die casting is composed of selection of cast alloy, design of die casting product, runner design and gate design, etc. In reality, however, die design of die casting has been performed by trial and error method, which cause economic and financial loss. Nowadays, several FEM(finite element method) and FDM(finite difference method) codes have been developed to analyze process of die casting, but this is just confined to an offer of limited information for die design of die casting. In this study, die design system for gate of die casting process has been developed to present algorithm for automation of die design, especially runner-gate system. In addition, specific rules for runner-gate system have been presented to avoid too many trials and errors with expensive equipment. It is possible for engineers to make automatic and efficient die design of die casting and it will result in reduction of expense and time to be required.
Fabrication of Microshafts using Electrochemical Process
Lim, Young-Mo ; Lim, Hyung-Jun ; Kim, Soo-Hyun ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 3, 2001, Pages 169~174
We proposed a new fabrication method using electrochemical process for microshafts. This method is a kind of atomic removal process by chemical reaction. Therefore, it is possible to make thin and long shafts regardless of the stiffness of materials. Because shaping process is simply switched to polishing process by varying process conditions, we can precisely fabricate microshafts with very smooth surface. We also fabricated a very thin shaft with the diameter as small as 10
m and a microshaft with high aspect ratio.
Nonlinear Vibration Responses of a Spring-Pendulum System under Random Base Excitation
Cho, Duk-Sang ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 3, 2001, Pages 175~181
An investigation into the response statistics of a spring-pendulum system whose base oscillates randomly along vertical and horizontal line is made. The spring-pendulum system with internal resonance examined is known to be a good model for a variety of engineering systems, including ship motions with nonlinear coupling between pitching and rolling motions. The Fokker-Planck equation is used to generate a general first-order differential equations for the random responses of the system are reduced to a system of autonomous ordinary differential equations. In view of equilibrium solutions of this system and their stability, the response statistics is examined. It is seen that increase in horizontal excitation level leads to a decreased width of the internal resonance region.
A Study on the Characteristics for the Blanking of Lead Frame with the Rectangular Shape Blanking
Lim, San-Heon ; Suh, Eui-Kwon ; Shim, Hyun-Bo ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 3, 2001, Pages 182~188
An experiment is carried out to investigate the characteristics of blanking for copper alloy C194 (t=0.254mm), a kind of IC lead frame material. By varying clearance between die and punch, the shapes of shear profile are examined. Finite element analysis with element deletion algorithm for ductile fracture mode is also carried out to study the effect of clearance theoretically and to compare with experimental results. The rectangular shape specimen with four different corner radius is used to study the characteristics of blanking for straight side and corner region simultaneously. As the result, the ratios measured from the experiment of roll over, burnish, and fracture zone based on intial blank thickness are compared with those of FE analysis. Both experiment and FE analysis show that the amount of roll over and fracture is increased as the clearance increases. It has been found that larger clearance is required than that of straight region when the radius of corner is less than thickness of blank, in order to maintain same quality of shear profile at the corner region.
An Inductive Micro Position Sensign System and Analysis of its Response Characteristics
Choi, Dong-Jun ; Choi, In-Mook ; Kim, Soo-Hyun ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 3, 2001, Pages 189~194
This paper presents a mew design of an inductive position sensing system with high sensitivity. The designed system consists of the driving coils, position-detecting coils, and closed loop formed magnetic blocks. To obtain high sensitivity we design a symmetric and closed loop type measuring system with small air-gaps. The elements that affect the system characteristics are turn ratio, excitation frequency, air-gap size, capacitance effect, and load resistance. By experimental investigation, the influences of these elements are examined and the system parameters are selected. The sensitivity of the newly designed system is greater than 2800mV/(V mm) and the linearity error is below
Stability Analysis in Transient Cut during Endmilling
Kang, Seok-Jae ; Cho, Dong-Woo ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 3, 2001, Pages 195~204
Virtual computer numerical control(VCNC) arises from the concept that one can experience pseudo-real machining with a computer-numerically-controlled(CNC) machine before actually cutting an object. To achieve accurate VCNC, it is important to determine abnormal behavior, such as chatter, before cutting. Detecting chatter requires an understanding of the dynamic cutting force model. In general, the cutting process is a closed loop system that consists of structural and cutting dynamics. Machining instability, namely chatter, results from the interaction between these two dynamics. Several previous reports have predicted stability for a single path, using a simple cutting force model without tool runout and penetration effects. This study considers both tool runout and penetration effects, using experimental modal analysis, to obtain more accurate predictions. The machining stability in the corner cut, which is a typical transient cut, was assessed from an evaluation of the cutting configurations at the corner.
Characteristics on the Output Coupled Type CVT Combined Differential Gear Unit
Choi, Sang-Hoon ; Kim, Yeon-Su ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 3, 2001, Pages 205~215
Continuously variable transmission(CVT) mechanisms considered here combine the functions of a 2K-H I type differential gear unit and a V-belt continuously variable unit(CVU). One shaft of the V-belt CVU is connected directly to the differential gear unit and remaining shaft of it is linked to the output shaft. These mechanisms have many advantage which are the decrease of CVT size, the increase of overall efficiency, the extension of speed ratio range, and the generation of geared neutral. In this paper six different mechanisms of output coupled type CVT are proposed. Some useful theoretical formula related to speed ratio, power flow and efficiency are derived and analyzed, and theoretical analysis are proven by various experiments.