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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
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Volume & Issues
Volume 6, Issue 4 - Dec 1989
Volume 6, Issue 3 - Sep 1989
Volume 6, Issue 2 - Jun 1989
Volume 6, Issue 1 - Mar 1989
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초정밀가공 기술의 현황과 전망
Gang, Cheol-Hui ;
Journal of the Korean Society for Precision Engineering, volume 6, issue 4, 1989, Pages 11~20
CNC 기술의 동향
Kim, Ho-Yeon ;
Journal of the Korean Society for Precision Engineering, volume 6, issue 4, 1989, Pages 21~31
Automatic Conversion of Design Drawing For CAD/CAM Integration
Kim, Ho-Ryong ; Hong, Ji-Su ; Jo, Seong-Bong ;
Journal of the Korean Society for Precision Engineering, volume 6, issue 4, 1989, Pages 32~42
An algorithm and its computer program are developed for the computer aided automatic conversion from 2 dimensional (2-D) design drawings to a 3 dimensional used to generate the tool path of NC machine. The algorithm and its computer program developed were applied to several real objects for their feasibility check and showed satisfactory results. As the results of this study, it was proved that a foundation work to prepare the data base for CAD/CAM integ- ration can be established so as to improve the productivity.
A Study on The Characteristics of the 2-Dimensional Jet
Kim, Kyung-Hoon ; Park, Sang-Kyoo ;
Journal of the Korean Society for Precision Engineering, volume 6, issue 4, 1989, Pages 43~51
Free jet was investigated experimentally and numerically in range of Reynolds number from 9900 to 21000. The working fluid was air; the mean velocity components and turbulent quantities were measured by a hot-wire anemometer. In numerical computations, the governing partial differential equations of elliptic type were solved with conventional k-
turbulence model. The measurements show that the jet increased linearly in flow direction, and that similarity for each turbulent quantity such as Reynolds shear stress, or turbulent kinetic energy was revealed in the fully developed region. The computational results show good agreements with experiments.
Digital Optimal Contorl of Servomotor System Considering Torsional Vibration Characteristics
Jo, Seung-Ho ;
Journal of the Korean Society for Precision Engineering, volume 6, issue 4, 1989, Pages 52~60
In order to control the transient torsional vibration of rotational shaft system, the torsional stiffness of it has been taken into account in modelling the plant. In this paper the observer and controller has been designed in two ways. One is to consider the torsional stiffness and the other is to idealize the rotational shaft as rigid body. The third order observer considering torsional stiffness shows stable response on computer simulation. When the observer is designed on assumption of the rotational shaft being rigid body, the reduced order observer shows stable response whereas the full order observer shows unstable response.
A Study on the Signal Process of Cutting Forces in Turing Process and it's Application (l) -Chip Form monitoring through the Signal Process using Cutting Forces-
Kim, Do-Young ; Nam, Gung-Suk ;
Journal of the Korean Society for Precision Engineering, volume 6, issue 4, 1989, Pages 61~70
A new analytical method is proposed to monitor the chip form of cutting forces applying the techinque of signal process. Cutting experiments are carried out under various cutting conditons and cutting forces are measured in-processing through Tool Dynamometer. In this report, auto-correlation functions, frequency characteristics of dynamic force, high frequency distribution and Peak/RMS values are calculated from the measured cutting forces, and the concept of method is also discussed. The experimental results show that six types of the form of chips are possible to classify from the signal of cutting forces not related to cutting conditions.
A Study on Guide System for Optimization of Machining Process
Choi, Jong-Geun ; Yang, Min-Yang ;
Journal of the Korean Society for Precision Engineering, volume 6, issue 4, 1989, Pages 71~83
The optimization in the machining process has been a long-standing goal of the manufacturing community. The optimization is composed of two main subjects;one is to select an optimum cutting condition, and the other is to detect the emergency situation and take necessary actions in real-time base. This paper proposes a reliable and practical guide system whose purpose is the optimization of cutting conditions, and the detection of tool failure in the machining process. The optimal cutting conditions are determined through the estimation of tool wear rate and the establishment of access- ible field from the measured cutting temperature and force. Tool breakage is detected by the normal force component acting on minor flank face extracted from on-line sensed feed force and radial force. In experiments, the proposed guide system has proved availability for the decision of reliable cutting conditions for the given tool-work system and the detection of tool breakage in ordinary cutting environments.
A Study on the Computer Aided Process Design of Multi Stage Cold Forging of Rotationally Symmetric Parts
Choi, Jae-Chan ; Kim, Hyung-Sub ; Huh, Man-Jo ;
Journal of the Korean Society for Precision Engineering, volume 6, issue 4, 1989, Pages 84~93
This paper describes some development of Computer-Aided Process Planning System for cold-forging of rotationally symmetric parts(soild shape and solid-can combined shape) produced by the presses or formers. Using the developed system, forming sequences for producing final product are generated as graphic forms and process names, preform dimensions and process parameters(load, punch pressure, die pressure) are generated as routing sheets. Konwledges for forming sequence and process parameters are extracted from process limitations, plasticity theories, handbooks, relevent refferences and empirical know-how of experts in cold forging companies. Among extracted knowldeges, general and consistent knowledges are represented as design rules and are constructed as knowledge base. The developed system provides more powerful tool for through checking the producibilities of design, conformation of appropriate forming sequences and discoveries of new possibility. The results of the developed system are in good agreement with the practical data.
Effect of Plastic Strain on the Surface Integrity of Steel
Kim, Tae ;
Journal of the Korean Society for Precision Engineering, volume 6, issue 4, 1989, Pages 94~102
The effect of plastic strain on the surface integrity of mild steel (SS 41) was studied. This paper shows that the recrystallization technique is adequate to evaluate the plastic strain in a machined surface experimentally. The relations between the plastic strain and the machining conditions are quantitatively evaluated by using the recrystallization technique. The obtained results are summarized as follows. 1. The surface integrity of steel is considerably influenced by the amount of surface region deformation produced by changes in cutting conditions. 2. The plastic strain in machined surface produced by changes of the cutting conditions is evaluated by the recyrstallization technique. 3. The plastic strain increases with the increase of depth of cut and the decrease of rake angle. 4. When the cutting force is high and the rake angle is small, the value of maximum true strain reaches to high. 5. The maximum true strain is related to the cutting energy, and the values increase with the increase of the unit shear and total engergy in constant depth with the increase of the energy values.
Experimental Study on the Magnetic and Mechanical Properites in a Cold Rolled Steel
Kim, Chung-Kyun ; Kim, Chong-Eok ;
Journal of the Korean Society for Precision Engineering, volume 6, issue 4, 1989, Pages 103~107
The effects of annealing temperature on the magnetic properties (maximum permeability, coercive force and remanence) and mechanical properties (hardness, tensile strength and elongation at rupture) were analyzed using the nondestructive impulsive magnetic analyzer in a medium carbon cold rolled steel sheet. This nondestructive method was very useful for the analysis of magnetic and mechanical properties of materials. As it was known in the literature, the three distinct processes that indicate the recovery, recrystallization, and grain growth of a metal were measured with the non-destructive analyzer.
A Study on Robust Controller Design of Multi-Joint Robot Manipulator Using Adaptive Control
Han, Sung-Hyun ; Lee, Man-Hyung ;
Journal of the Korean Society for Precision Engineering, volume 6, issue 4, 1989, Pages 108~118
An adaptive control scheme has been recognized as an effective approach for a robot manipulator to track a desired trajectory in spite of the presence of nonliearity and parameter uncertainty in robot dynamics model. In this paper, an adaptive control scheme for a robot manipulator is proposed to design robust controller using model reference adaptive control technique and hyperstability theory but it does away with] assumption that the process is characterized by a linear model remaining time invariant during the adaptation process. The performance of controller is demonstrated by the simulation about position and speed control of a six-link manipulator with disturbance and payload variation.
A Study on the Coordinate Transformation by Using the Analog Signal Processing
Che, Woo-Seong ; Park, Seo-Wook ; Oh, Jun-Ho ;
Journal of the Korean Society for Precision Engineering, volume 6, issue 4, 1989, Pages 119~125
This paper presents a method of analog signal processing for a coordinate transformation. Through the proposed method, two-dimensional position information obtanided from any type of null-detector can be transformed into the information with repect to world coordinate system. In order to implement the method, a null- detection device which consists of four optical proximity sensor is developed. Through the experiments for performance evaluation, the effectiveness of the proposed method has been demonstrated.
Dynamic Design of an NC Lathe by Using Substructure Synthesis Method
Lee, Sin-Young ; Lee, Jang-Moo ;
Journal of the Korean Society for Precision Engineering, volume 6, issue 4, 1989, Pages 126~135
In this study, in order to perform dynamic design of machine tools reasonably and effectively, a method was formulated to be applicable to the structures connected by joints having elasticity and damping by using substructure synthesis method. And to analyze chatter-free performance, a 3 dimensional cutting dynamics theory was used. Computer program package for the dynamic design of machine tools was developed by combining those and spplied to improvement of performance of NC lathe. Also, the optimization in the structural modifications of machine tool substructure was studied by evaluating the effects of the substructural modifications on total system performan
Effects of parameters of a linear dynamic vibration absorber on the vibrational characteristics of damped vibrational systems
Yoon, Jang-Sang ; Lee, Yang-U ; Song, Chang-Seop ;
Journal of the Korean Society for Precision Engineering, volume 6, issue 4, 1989, Pages 136~144
This paper presents the vibrational characteristics of linear damped vibrational systems with a linear dynamic absorber. The amplitude ratios of main vibrational system are derived from the equation of motion for the system, and optimal natural frequency ratio and damping ratio of dynamic absorber are obtained by computer simu- lation, which minimize the amplitude ratio of main vibrational system for the whole range of the frequency ratio. And, the effects of the parameters on the amplitude ratios are investigated. As the results, the effect of the natural frequency ratio on the amplitude ratio of main vibrational system is more important than that of the damping ratio of dynamic absorber as damping ratio of main vibrational system becomes larger. For the case of large damping ration of main vibrational system becomes larger. For the case of large damping ratio of main vibration system, the amplitude ratios are not decreased dramationally in spite of inoreasing mass ratio.