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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of The Korean Society of Manufacturing Technology Engineers
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Journal DOI :
The Korean Society of Manufacturing Technology Engineers
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Volume & Issues
Volume 6, Issue 4 - Dec 1997
Volume 6, Issue 3 - Sep 1997
Volume 6, Issue 2 - Jun 1997
Volume 6, Issue 1 - Mar 1997
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전동기 유압 펌프 일체형 소형 유압 유니트
Journal of The Korean Society of Manufacturing Technology Engineers, volume 6, issue 2, 1997, Pages 7~9
Development of Vision System Model for Manipulator's Assemble task
Journal of The Korean Society of Manufacturing Technology Engineers, volume 6, issue 2, 1997, Pages 10~18
This paper presents the development of real-time estimation and control details for a computer vision-based robot control method. This is accomplished using a sequential estimation scheme that permits placement of these points in each of the two-dimensional image planes of monitoring cameras. Estimation model is developed based on a model that generalizes know 4-axis Scorbot manipulator kinematics to accommodate unknown relative camera position and orientation, etc. This model uses six uncertainty-of-view parameters estimated by the iteration method. The method is tested experimentally in two ways : First the validity of estimation model is tested by using the self-built test model. Second, the practicality of the presented control method is verified in performing 4-axis manipulator's assembly task. These results show that control scheme used is precise and robust. This feature can open the door to a range of application of multi-axis robot such as deburring and welding.
A Study on the Development of Pistion Measuring System
Journal of The Korean Society of Manufacturing Technology Engineers, volume 6, issue 2, 1997, Pages 19~25
The purpose of this study is the development of professional measuring system of piston. Designed values are compared with values of measured data of oval shape piston and allowable range and deviation are printed out by using this system. Thereafter, it is able to measure ovality precisely and to estimate its quality rapidly.
A Study on Fatigue Behavior considering Effects of Redistributing Compressive Residual Stress and Crack Closure in SS330 Weldment
Journal of The Korean Society of Manufacturing Technology Engineers, volume 6, issue 2, 1997, Pages 26~33
In this study effect of residual stress and its redistribution in weldment on the fatigue crack propagation was investigated. Fatigue tests were conducted by the center notched specimens machined with welded plate. The residual stress and its redistribution after the crack growth were measured by the magnetizing stress indicator and hole-drilling method. Fatigue crack propagation was estimated by the specimens having residual stress redistributed after the cracks growth and having the effects of crack closure. Crack growth rates were predicted and compared with experimental results. It had been found that the predicted crack propagation rates have a good agreement with experimental results when the redistribution of residual stress was considered.
An Experimental Study on the Frequency Characteristics of Hole Tones Generated by a Circular Jet of Low Speed Impinging on a Plate with a Round Hole
Journal of The Korean Society of Manufacturing Technology Engineers, volume 6, issue 2, 1997, Pages 34~41
The objective of this study is to investigate experimentally the frequency characteristics of the hole tones generated by a circular jet of low speed impinging on a plate with a round hole. The experimental results about the sound spectrum and the time wave of the hole tone are presented and discussed in relation with the hole type, the jet velocity and the distance of the nozzle-to-plate with a round hole. From the sound spectrum and time wave measurements, it is found that the hole tone is generated not only by an interaction of convected vortices with a round hole but also by a series of vortex shedding from jets passing through a hole. The hole tones generated by a feedback mechanism consist of many frequency stages and also have a hysteresis phenomenon like an edge tone. But the hole tones generated by a series of vortex shedding have nothing with the stage characteristics. The frequencies of hole tones are influenced by the jet velocity, the distance of the nozzle-to-plate with a round hole and the hole type.
Realistic Life Analysis of Spiral Bevel Gears in the Drive System based of Probablistic Reliability
Journal of The Korean Society of Manufacturing Technology Engineers, volume 6, issue 2, 1997, Pages 42~48
Drive systems are composed of spiral bevel gear, axle and bearings. In this paper, drive systems and the part of them are analyzed and a correlation of the factor that shows the geometry of spiral bevel gear is evaluated. The Weibull distribution of probability for survival, which caused by the load of bearings and gear teeth, would be calculated, and the life and reliability with equivalent function could be measured more specifically. The reliability methods are applied as a probability of which the gear drive systems are satisfiably operated.
Buckling Behavior of Laminated Composite Cylindrical Shells
Journal of The Korean Society of Manufacturing Technology Engineers, volume 6, issue 2, 1997, Pages 49~58
The objective of this study is to investigate effects of prebuckling on the bucking of laminated compostie cylindrical shells, Both axial compression and lateral pressure are considered for laminated composite cylindrical shells with length to radius ratios. The shell walls are made of a laminate with several symmetric ply orientations. The study was using finite difference energy method, utilizing the nonlinear bifurcation branch with nonlinear prebuckling displacements. The results are compared to the buckling loads determined when membrane prebuckling displacements are considered.
The Effect of Microstructure and Temperature on Fatigue Crack Propagation in Ti-3A1-2.5V A11oy
Journal of The Korean Society of Manufacturing Technology Engineers, volume 6, issue 2, 1997, Pages 58~66
Ti alloys, with the advantageous tensile strength/density ratio and the chemical stability, have been used widely in the aerospace and chemical engineering industries and their usages are still expanding in various industrial areas. In the automotive industry, because of their superior merits of weight reduction and fuel saving, Ti alloys are expected to be used as various part materials including connecting rods, engine valves, springs and retainers, which are all subjected to the fatigue loads. In this study, using Ti-3A1-2.5V, the effects of temperature and microstructure change on fatigue crack propagation has been investigated. Five different microstructures were tested at the temperatures of room temperature, 20
under the same frequency 20Hz. Some of the conclusions obtained are as follows: (1)Microstructurally, the morphology of less
-phase and finer lamellar structure of
-Ti showed better registance to the fatigue crack propagation. (2)Fatigue crack growth rate increased with test temperature.
A Study on the Noise.Vibration Characteristics of Differential Gear according to the Materials
Journal of The Korean Society of Manufacturing Technology Engineers, volume 6, issue 2, 1997, Pages 67~75
The noise . vibration characteristics of Hypoid gears which were made from three seperate materials(SCM, TSCM, SNCM) under the identical process were investigated for the sake of durability improvement of differential gear compatible with low level noise gear set. For this study, we developed a rig experimental equipment which can perform close noise.vibration experiment of differential gear. Consequently, we could analyze the noise.vibration characteristics of final reduction gear by materials, and also we observed changes in both metallic structure and hardness according to the materials of pinion gear. In addition to this, the correlation between the vibration of the differential gear and the interior noise of the passenger vehicles was proved by analyzing the results of rig vibration experiment and field noise test.
A Study on Highly Accurate Evaluation Technique using Ultrasonic Spectrum Analysis Method
Journal of The Korean Society of Manufacturing Technology Engineers, volume 6, issue 2, 1997, Pages 76~82
The discrimination of flaw shape and sizing is very important subject in the material evaluation for semiconductor and new materials. The aim of this paper is to investigate the spectrum analysis of artificial defect signal captured from steel ball embedded in the resin. The results show that it can be evaluated quantitatively the size of artificial defect, from the amplitude variation of same frequency if the probe with same diameter and focal length is used. Comparing with the amplitude variation of the high frequency component and low frequency component obtained from the distance of defect center position, it can be estimated steel ball and flat bottm defect.
An Intelligent Measuring and Inspection System for NC Machine Tools
Journal of The Korean Society of Manufacturing Technology Engineers, volume 6, issue 2, 1997, Pages 83~91
Interactive measuring Part Program Generating Tools (IMPPGT) realized on the FANUC 15MA using touch trigger probes and interactive macro functions of the CNC were developed for intelligent measuring and inspection systems on the machine tools. Machine tools. Menu driven measuring and inspection functions of the IMPPGT were studied and implemented on the CNC through the macro executor and ROM writer. In order to automate measurement and inspection procedures in machine shops, measuring G Code system was also proposed. Using the developed measuring G Code system on the machine tool, untended measurement and inspection operation was able to be realized in FMS lines.
Optimum-selection in the Welding Process Variable for Torch-rotation Method of Automation Welding-machine System
Journal of The Korean Society of Manufacturing Technology Engineers, volume 6, issue 2, 1997, Pages 92~101
The purpose of this welding process of the exclusive welding-machine using welding torch-rotation type is to develop a mechanism which can solve the problem of twisting of welding wires and cables. The technique was developed by revising the torch position and smooth controlling of both the normal and reverse rotation. Some of the advantages of using the torch-rotation type apply to the work-rotation technique are the practical uses of increased work space and link work with the factory automation system. Do apply the welding process, I designed and made a special unit so called torch part in order to solve the problems of kinematical. And I made a control panel which can manipulate the progress of the entire process at the work shop. Even if it will be applied to another kind of axle casing's welding work, this process can be utilized if other sizes of the fixed pin and work part is produced and changed. The development of this exclusive welding-machine could reduce the manpower of skilled welding labor and increase productivity and better quality product in comparison to the handmade product.
Machining of Wc-Co alloys with diamond tool
Journal of The Korean Society of Manufacturing Technology Engineers, volume 6, issue 2, 1997, Pages 102~111
This paper deals with the machinability based on turning of WC-Co allows with the coated and the sintered diamond tools. The main conclusions obtained are as follows. (1) When machining WC-10%Co alloy, the flank wear of sintered diamond tool increases more largely with the increase of cutting speed in comparison with coated diamond tool. The tool wear decreases with the increase of the grain size and nose radius of sintered diamond tool. (2) When machining WC-20%Co alloy, the tool wear and cutting force decrease with the decrease of rake angle. Their exists a certain cutting speed range to exhibit the smallest tool wear in machining the WC-20%Co alloy, and this critical cutting speed becomes higher by 2 times in the case of coated diamond tool compared with sintered diamond tool. (3) The machinability becomes better with the increase of Co content. The effects of cutting speed and feed rate on the roughness of machined surface become smaller with the increase of Co content.
Monitoring of Tool Wear using AE Signal in Interrupted cutting
Journal of The Korean Society of Manufacturing Technology Engineers, volume 6, issue 2, 1997, Pages 112~118
Characteristics of AE(Acoustic Emission) signal is related to cutting conditions, tool materials, and tool geometry in metal cutting. Relation between AE signal and tool wear was investigated experimentally. Experiment is carried out by interrupted cutting for SCM420 workpiece with TiN coating tool on HSS material. AE RMS voltage and count per event were increased according to tool wear. The major results are as follows : 1) AE RMS value is nearly constant as cutting speed changes, but is rapidly increase as feed rate increases. 2) AE RMS value and Count per Event increase as tool wear increases. 3) It is more effective to monitor tool wear by Incremental rate of AE RMS value than by Incremental rate of count per event.