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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Society for Precision Engineering
Journal Basic Information
Journal DOI :
Korean Society of Precision Engineering
Editor in Chief :
Volume & Issues
Volume 2, Issue 3 - Dec 1985
Volume 2, Issue 2 - Jun 1985
Volume 2, Issue 1 - Jan 1985
Selecting the target year
소성가공에 관한 몇 가지 현상 해설
Choe, Jae-Chan ;
Journal of the Korean Society for Precision Engineering, volume 2, issue 3, 1985, Pages 5~12
Lee, Bong-Jin ;
Journal of the Korean Society for Precision Engineering, volume 2, issue 3, 1985, Pages 13~19
Hong, Seung-Hong ;
Journal of the Korean Society for Precision Engineering, volume 2, issue 3, 1985, Pages 20~27
A Study on the Effect of the Components of Cutting Resistance upon Friction between Drill and Inside Wall of Drilled Hole in Drilling
Koo, Youn-Yoog ;
Journal of the Korean Society for Precision Engineering, volume 2, issue 3, 1985, Pages 28~40
In this study, to check up on the effect of the components of cutting resistance upon friction between drill and inside wall of hole in drilling, the experiment was performed with individual specimen of carbon steel, cast iron, aluminium alloy under various cutting conditions: depth of hole, cutting speed, feed rate, shape and material of specimen. On the basis of the experimental results, the following conclusions are drawn; 1. The components of cutting resis- tance were increased in proportion to the increase of depth of hole owing to frictional resistance of drill margin and chip-jamming. 2. As feed rates increase, torque and thrust were increased. When comparing to the increasing rate for these components respecitively, thrust is higher tendency than torque. 3. As drill diameter increase, torque and thrust were increased. When comparing to the increasing rate for these components respectively, torque is higher tendency than thrust. 4. In the case of torque, the frictional resistance between drill margin and inside wall of drilled hole accounts for about 20 percent of carbon steel, 14 of cast iron, 10 aluminium alloy in drilling. But the effect of thrust force could be negligible. 5. Comparison between the theoretical and experimental results showed a close agreement so far as depth of hole is about three times of drill diameter. But there was a wide difference between them beyond the rane of three times, because of characteristics of the drilling process.
A Study on the Behavior of the Burn-On in Sand Mold
Gwak, Chang-Seop ;
Journal of the Korean Society for Precision Engineering, volume 2, issue 3, 1985, Pages 41~46
The behavior of the burn-on in sand mold has been investigated by varying the pouring metal, bonding materials, additive materials and molding sand. The results obtained from thease experiments are as follows; 1) The burn-on layer of silica sand decreased in order of carbon steel, gray cast iron and stainless steel, and thease burn layer proceeded mostly by producing FeO. 2) The burning reaction of silica sand mold in carbon steel castings declined with increasingly bentonite content, but water-glass scarcely took part in the burn-on reaction. 3) The addition of feldspar and seacoal to silica sand promoted the inhibiting burn-on. 4) The burn-on layer of sand mold decreased of silica sand, chromite sand and olivine sand.
Analysis of the Three-Roll Power Spinning Process by using the Method of Force Polygon Diagram
Yoo, Dong-Jin ;
Journal of the Korean Society for Precision Engineering, volume 2, issue 3, 1985, Pages 47~58
The study is concerned with the analysis of the required loads and torque in the Three-Roll Power Spinning Process by using the Method of Force Polygon Diagram. Experiments are carried out using pure lead billets at room temperature. The radial force, the axial force and the torque occurring during the process are calculated theoretically and are compared with the experimental data. An approximate load distribution is known by the Force Polygon Diagram.
A Study on the Comparison of Least Squares Roundness with Minimum Zone Roundness
Kang, Myung-Soon ; Han, Eung-Kyo ; Kwon, Dong-Ho ;
Journal of the Korean Society for Precision Engineering, volume 2, issue 3, 1985, Pages 59~69
The purpose of this paper is to investigate the variations of out-of- roundness due to its assessment methods for the practical workpieces. Experiments were carried out with the test specimens having the typical roundness profile. The roundness measuring system which has the autocentripetal functions and the automatic centering table unit was used. From the experimental results, it was found that the ratio of LSC to MZC values varied with the shape of roundness profiles, and the rate of variation for out-of-roundness was increased logarithmically with the increment of undulations by the effect of filter. Therefore, it is suggested that the least squares center method should be useful with the sufficient accuracy except for some special cases in the roundness profiles, and the condition of filter has considerable influence upon the out-of-roundness to be measured.
Optimal Design of Four-bar Mechanism in consideration of Tolerances and Clearances
Kim, Ho-Ryong ;
Journal of the Korean Society for Precision Engineering, volume 2, issue 3, 1985, Pages 70~76
A four-bar mechanism in consideration of the tolerances on link lengths and the clearances in joints is optimally designed by the method of stochastic analysis. The random nature of clearances and tolerances establishes a stochastic optimization design equation in which the parameters in the equation are described by random variables. In order to solve the design equation, the stochastic problem is converted into an equivalent deterministic one. The synthesis of four-bar mechanism for minimum mechanical and structural errors is carried out by the optimization techni- ques using Chebyshev spacing of precision points. By the results from the synthesized mechanism, the generated and desired motions are examined.
A Study on the Adaptive Control in Machining Process
Song, Ji-Bok ; Lee, Man-Hyung ; Lee, Si-Bok ;
Journal of the Korean Society for Precision Engineering, volume 2, issue 3, 1985, Pages 77~83
Adaptive control technique for a milling process is developed and implemented in an NC milling machine retrofitted to enable the micro-computer control. The control algorithm has the objects to guarantee the optimal tool life which can give the predetemined allowable lower limit of surface roughness. The experimental results show 1) that the extended tool life equation has good reliability in normal tool wear conditions. 2) and that the proposed adaptive control technique, which determine the optimal cutting condition by basing on the tool life equation modified continually according to the tool wear measured in real time, performs well.
A Study on the Design of a Digital Controllor for the Low-cost Automation of a Cable Extruding System
Kim, Yong-Deak ;
Journal of the Korean Society for Precision Engineering, volume 2, issue 3, 1985, Pages 84~91
This paper proposes the theory for the Low Cost Automation (LCA) as a intermediate process of the factory automation, where the SCA is new adaptation for the improving productivity without changing the current product lines. And also this paper deals with the case study for the predictable effects and technical method at the extruding cable lines. As the results, the implementation of the LCA theory could be acomplished saving materials and man power, improving reliability and productivity. For this facilities, it cost within 5% extra expense of a extruding cable line systems. And it could be refund in six months.