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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 12, Issue 12 - Dec 1995
Volume 12, Issue 11 - Nov 1995
Volume 12, Issue 10 - Oct 1995
Volume 12, Issue 9 - Sep 1995
Volume 12, Issue 8 - Aug 1995
Volume 12, Issue 7 - Jul 1995
Volume 12, Issue 6 - Jun 1995
Volume 12, Issue 5 - May 1995
Volume 12, Issue 4 - Apr 1995
Volume 12, Issue 3 - Mar 1995
Volume 12, Issue 2 - Feb 1995
Volume 12, Issue 1 - Jan 1995
Selecting the target year
Machine Tool Technology;The Present And The Future(5)
Journal of the Korean Society for Precision Engineering, volume 12, issue 8, 1995, Pages 5~18
Path Control of a Mobile Robot Using Fuzzy-Neural Hybrid System
Lee, B.R. ; Lee, W.K. ; H.C. Yi ;
Journal of the Korean Society for Precision Engineering, volume 12, issue 8, 1995, Pages 19~26
In this paper, a fuzzy-neural hybrid control approach is proposed for controlling a mobile robot that can avoid an unexpected obstacle in a navigational space. First, to describe the global structure of a known environment, a heuristic collision-free space band is introduced. Based on the band, the moving information in the known environment is trained to a neural controller. Then, during the execution of a mobile robot navigation moving information at each position is given the neural controller. If the mobile robot encounters an unexpected obstacle, a fuzzy controller activates to avoid the unexpected obstacle. Finally, some numerical examples are presented to demonstrate the control algorithm.
A Study on the Drilling Characteristics of Carbon Fiber Epoxy Composite Materials by Diamond Grit Electroplated Drills
H.C. Kim ; K.S. Kim ; H.B. Kim ; S. Namgung ;
Journal of the Korean Society for Precision Engineering, volume 12, issue 8, 1995, Pages 27~38
For solving troubles happened during the drilling process with carbon fiber epoxy composite materials(CFRP) by using HSS drill, a few types of diamond gift electroplated drills are manufactured, and machinability of these drills is experimented with a variety of cutting speed and feed rate. These drills have some advantages of good wear resistant and the conception of grinding process. As a result, using of these drills improves both troubles being caused by tool wear and damage of exit surface depending on fiber stacking angle. It is desirable that cutting conditions for the cutting thickness per revolution must be set under 0.01mm when the size of a diamond grit is # 60 .approx. 80.
Development of Dynamic Cutting Force Model by Mean Specific Cutting Pressure in Face Milling Process
Lee, B.C. ; D.K. Baek ; Kim, H.S. ;
Journal of the Korean Society for Precision Engineering, volume 12, issue 8, 1995, Pages 39~52
In order to design and improve a new machine tool, there is a need for a better understanding of the dynamic cutting force. In this paper, the computer programs were developed to predict the dynamic cutting force by the mean specific cutting pressure in the face milling process. The simulated cutiing forces in X, Y, Z directions resulted from the developed dynamic cutting force model are compared with the measured cutiing forces in the time and frequency domains. The simulated cutting force model have a good agreement with the measured forces in comparison with those resulted from the existing cutting force model.
A Study on the Classification and Prediction of the Chip Type under the Specified Cutting Conditions in Turning
Sim, G.J. ; Cheong, C.Y. ; Seo, N.S. ;
Journal of the Korean Society for Precision Engineering, volume 12, issue 8, 1995, Pages 53~62
In recent years, the rapid development of the machine tool and tough insert has made metal removal rates increase, and automatic system without human supervision requires a higher degree reliability of machining process. Therefore the control of chips is one of the important topics which deserves much attention. The chip classification was made based upon standard deviation of the mean cutting force measured by a tool dynamometer. STS304was chosen as the workpiece which is known as the difficult-to-cut material and mainly saw-toothed chip produced, and the chip type according to the standard deviation of mean cutting force was classified into five categories in this experiment. Long continuous type chip which interrupts the normal cutting process, and damages the operator, tool and workpiece has low standard deviation value, while short broken type chip, which is favourable chip for disposal, has relatively large standard deviation value. In addition, we investigated the possibility that the chip type can be predicted analyzing the relationship between chip type and cutting condition by the trained neural network, and obtained favourable results by which the chip type can be predicted with cutting conditon before cutting process.
A Sudy on the Cold Forging of Spur Gears form Hollow Cylindrical Billets
J.C. Choi ; C.H. Kim ; Y. Choi ;
Journal of the Korean Society for Precision Engineering, volume 12, issue 8, 1995, Pages 63~72
Closed-die forging of spur gears with hollow cylindrical billet has been analysed by using the upper-bound method. A kinematically admissible velocity field has been developed, wherein, an involute curve has been introduced to represent the forging die profile. In the analysis, the deformation region has been divided into nine zones. A constant frictional stress has been assumed on the contacting surfaces. Utilizing the formulated velocity field, numerical calculations have been carried out to investigate the effects of various parameters, such as module, number of teeth and friction factor, on the forging of spur gears. Hardness and accuracy of forged gears are measured. The following results have been obtained: (1) It is verified that an axisymmetric deformation zone exists between root circle and center of gear through forged gears. (2) The average relative forging pressure is predominantly dependent on the number of teeth and increases near the final filling stage as the addendum modification coefficient increases. (3) Close agreement was found between the predicted values of forging load and those obtained from experimental results.
An Exact 3D Data Extraction Algorithm For Active Range Sensor using Laser Slit
Y.Y. Cha ; D.G. Gweon ;
Journal of the Korean Society for Precision Engineering, volume 12, issue 8, 1995, Pages 73~85
The sensor system to measure the distance precisely from the center of the sensor system to the obstacle is needed to recognize the surrounding environments, and the sensor system is to be calibrated thoroughly to get the range information exactly. This study covers the calibration of the active range sensor which consists of camera and laser slit emitting device, and provides the equations to get the 3D range data. This can be possible by obtaining the extrinsic parameters of laser slit emitting device through image processing the slits measured during the constant distance intervals and the intrinsic parameters from the calibration of camera. The 3D range data equation derived from the simple geometric assumptions is proved to be applicable to the general cases using the calibration parameters. Also the exact 3D range data were obtained to the object from the real experiment.
Study on Thermal Behavior of Motor Integrated Spindle With Air Cooling System
Lee, D.W. ; Park, D.B. ; Park, H.K. ;
Journal of the Korean Society for Precision Engineering, volume 12, issue 8, 1995, Pages 86~91
Recently, motor integrated spindle is often used in a high speed spindle system of machine tools in order to increase machining speed. The important problem in high speed motor integrated spindle is to reduce thermal effect occured by motor and ball bearings. In this study, the effect of heat transfer from motor is investigated. The experimental equipment is composed with oil-air lubrication method, air cooling system and angular contact ball bearings. The results show that the thermal effect in motor is larger than in ball bearing until DmN 8000,000 with air cooling.
Self-Organizing Fuzzy Control of a Flexible Joint Manipulator
Park, J.H. ; Lee, S.B. ;
Journal of the Korean Society for Precision Engineering, volume 12, issue 8, 1995, Pages 92~98
The position control of flexible joint manipulator is investigated by applying the self-organizing fuzzy logic controller (SOC) proposed by Procyk and Mamdani. The SOC is a heuristic rule-based controller and a further extension of an ordinary fuzzy controller, which has a hierachy structrue which consists of an algorithm being identical to a fuzzy controller at the lower ollp and a learning algorithm accomodating the performance evalution and rule modification function at the upper ollp. This form of control can be used in those complex systems which have been too difficult to control or which in the past have had to rely on the experience of a human operator. Even though the significant dynamic coupling of the motors and links on the flexible joint manipulator, the performance of command-following is good by applying the proposed SOC.
High Efficient Cylindrical Grinding of Ferrous Materials Using Electrolytic In-process Dressing Method(ELID)
Lee, D.W. ; I. Takahashi ; T. Nakagawa ;
Journal of the Korean Society for Precision Engineering, volume 12, issue 8, 1995, Pages 99~105
This paper provides a highly efficient grinding for ferrous materials using ELID-grinding method. The grinding efficiency using ELID gring method with CIFB-cBN wheel and CB-cBN wheel is compared with general grinding method with V-cBN wheel. This paper measured grinding ratio for plunge grinding and grinding resistance for traverse grinding in order to investigate grinding ability. The results show that ELID grinding methods is useful for the high efficient grinding of ferrous materials.
Developing Algorithm and Software for Efficient Operation of Rotary Type Surface Mounter
Y.H. Lee ; J. Kim ; D.H. Kim ;
Journal of the Korean Society for Precision Engineering, volume 12, issue 8, 1995, Pages 106~113
Surface mounters are used to mount the parts of electronic products on PCB(Printed Circuit Board. Those machines rely on high precision, high productivity, and software for accomodation of use. In this paper, two algorithms and a software which can give the users the acco-modation and high productivity for rotary type surface mounters are presented. The algo- rithms for development of of the software consider all factors which affect the effeciency of the operation. And the interface between user and machine for the accomodation of use can be achieved through the developed software.
Blending Surface Using Rail Curves
Lee, H.K. ; G.E. Yang ;
Journal of the Korean Society for Precision Engineering, volume 12, issue 8, 1995, Pages 114~121
This paper describes a method which uses rail curves for blending surfaces. Blending surface between the free form surfaces which have the flexible shapes and are widely used today is investigated. The rail curves give blending surface continuty through Pointwise interpola- tion. It is the point in this paper that the blending surfaces give a good flexibility to modeling of base free form surfaces. Using rail curves for simple base surfaces, complicated models can be designed. Also this blending surfaces can be used for path generation in compoud surfaces.
A Study on the Analysis of Dynamic Characteristics of the Solenoid Valve of Automatic Transmission
C.S. Song ; Lee, Y.J. ; S.J. You ;
Journal of the Korean Society for Precision Engineering, volume 12, issue 8, 1995, Pages 122~130
To reduce the shock in shifting, the clutches and the brakes in automatic transmission have to be connected smoothly and disconnected rapidly. It is PCSV(Pressure Control Solenoid Valve) that paly this role of automatic transmission. In this paper, there were two steps in the analysis of the PCSV. The first step was modeling the elctromagnet by the permeance method. The second step was modeling the hydraulic circuit by the pressure differential equa- tion. In addition to this modeling, a experiment was performed and the commercial package program was used in order to justify modeling. The result of modeling coincide with the result of experiment and commercial package program. As a result, this modeling is usable in analysis of dynamic characteristics of the PCSV.
A Study on the Development of Small Size Three-Axis Stacker Crane for Automatic Ware House
Kim, J.Y. ; Sim, J.K. ; Kim, H.S. ; Han, J.H. ;
Journal of the Korean Society for Precision Engineering, volume 12, issue 8, 1995, Pages 131~139
In this study, small size stacker Crane for automatic ware house and interface circuit is designed and manufactured. IBM-PC is used as a controller. At 50kg
load, optimal motion velocity is 20 mm/min for X and Y axis and 12 mm/min for Z axis. Position fesolution is 0.005 mm and repeatability is .+-. 0.025 mm. Through characteristic experiment, effectiveness of the designed and manufactured stacker crane. PC control program, and design of interface circuit and construction of control system are shown. From these results, the developed stacker crane can be apply to FMS(Flexible Manufacturing System) and FA(Factory Automation) of industrial field.d.
Adaptive robust control for a direct drive SCARA robot manipulator
Lee, J.H. ; C.G. Kang ;
Journal of the Korean Society for Precision Engineering, volume 12, issue 8, 1995, Pages 140~146
In case the uncertainty existing in a system is assumed to satisfy the matching condition and to be come-bounded. Y. H. Chen proposed an adaptive robust control algorithm which introduced adaptive sheme for a design parameter into robust deterministic controls. In this paper, the adaptive robust control algorithm is applied to the position tracking control of direct drive robots, and simulation and experimental studies are conducted to evaluate control performance.
Determination of Stress Intensity Factors by Strain Measurement
Lee, O.S. ; K.C. Nah ;
Journal of the Korean Society for Precision Engineering, volume 12, issue 8, 1995, Pages 147~155
Recent experimental studies have been shown that strain gages can be employed to determine either static or dynamic stress intensity factors
wiht relatively simple experiments. However, it does not usually provide a reliable value of stress intensity factor because of local yielding and limited regions for strain gage placement at the vicinity of the crack tip. This paper attempted to define a valid region and to indicate procedures for locating and orienting the strain gage to determine static toughness
accurately form one strain gage readings with respect to varying loadings. The strain gage methods was used for compact tension specimens made of Polycarbonate and PMMA(polymethyl methacrylate). Series expansions of the static and dynamic strain fields are applied. Strain gage orientation and location are then studied to optimize the strain response. Especially, in the dynamic experiment, the specimen employed is an oversized Charpy V-notch specimen which has been modified to provide significant constraint with a large elevation of the flow stress. The impact behavior of the specimen is monitored by placing strain gage near the crack tip. The dynamic toughness
is determined from the strain time traces of this gage.e.
3D Range Finding Algorithm Using Small Translational Movement of Stereo Camera
Park, K.I. ; J.W. Yi ; J.H. Oh ;
Journal of the Korean Society for Precision Engineering, volume 12, issue 8, 1995, Pages 156~167
In this paper, we propose a 3-D range finding method for situation that stereo camera has small translational motion. Binocular stereo generally tends to produce stereo correspondence errors and needs huge amount of computation. The former drawback is because the additional constraints to regularize the correspondence problem are not always true for every scene. The latter drawback is because they use either correlation or optimization to find correct disparity. We present a method which overcomes these drawbacks by moving the stereo camera actively. The method utilized a motion parallax acquired by monocular motion stereo to restrict the search range of binocular disparity. Using only the uniqueness of disparity makes it possible to find reliable binocular disparity. Experimental results with real scene are presented to demonstrate the effectiveness of this method.
A Robust Speed Control System Design of Induction Motors Using Self-Tuning Control Method
Kim, S.B. ; B.H. Jeon ; S.K. Jeong ;
Journal of the Korean Society for Precision Engineering, volume 12, issue 8, 1995, Pages 168~175
A robust speed control algorithm under disturbances and reference change is developed using the self tuning control method in order to control induction motors. The method incorporates the concepts of the well known internal model principle and the annihilator polynomial. The effectiveness of the method is evaluated through the speed control experimental results of an induction motor for refernce change and arbitrary distrbance.