Go to the main menu
Skip to content
Go to bottom
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 6, Issue 4 - Dec 1989
Volume 6, Issue 3 - Sep 1989
Volume 6, Issue 2 - Jun 1989
Volume 6, Issue 1 - Mar 1989
Selecting the target year
Han, Min-Hong ;
Journal of the Korean Society for Precision Engineering, volume 6, issue 3, 1989, Pages 7~14
Kim, Dong-Jin ; Kim, Jin-Ho ;
Journal of the Korean Society for Precision Engineering, volume 6, issue 3, 1989, Pages 15~23
A Study on Step Feed Working in Drilling
Jeon, Eon-Chan ;
Journal of the Korean Society for Precision Engineering, volume 6, issue 3, 1989, Pages 24~31
By use of the machining center, step-feed drilling was operated under the variety of conditions as to materials, tools and cutting conditions. Based on this study the following conclusions can be drawn : 1) The cutting force can be diminished by utilizing the step-feed working; specially the most effective was it for the brass among the carbon steel, the brass, and the cast iron. 2) Tool life can be enlarged more than double when three-step-feed working is used. 3) For the constant cutting-depth(30mm), the most optimal number of stepping is 3.
Positioning Accuracy Improvement of Robots by Link Parameter Calibration
Cho, Eui-Chung ; Ha, Young-Kyun ; Lee, Sang-Jo ; Park, Young-Pil ;
Journal of the Korean Society for Precision Engineering, volume 6, issue 3, 1989, Pages 32~45
The positioning accuracy of robots depends upon a forward kinematics which relates the joint variables to the orientation and position of the robot extremity in the absolute coordinate system. The relationship between two connective joint coordi- nates of a robot, which is the basis of the kinematics, is defined by 4 Denavit-Hartenberg parameters. But manufacturing errors in machining and assembly process of robots lead to disctrepancies between the design parameters and the physical structure. Thus, improving the positioning accuracy of robots reguires the identification of the actual link parameters of each robot. In this study, the least-squares method is used to calibrate the link parameters and off-line parameter calibration software is developed. Computer simulation is done to study the dependence of the calibration performance upon the DOF of the robot and number of acquired data set used in the least-squares method. 3 DOF Robot/Controller and specially designed 3D coordinate measurer is made and experiment is carried out to verify the theoretical and computational analysis.
A Study on an Optimal Design & Manufacture of Vibration Test Fixture(l)
Kim, Do-Young ; Nam, Gung-Suk ;
Journal of the Korean Society for Precision Engineering, volume 6, issue 3, 1989, Pages 46~59
The purpose of test fixture is to mechanically couple energy from a shaker into a test specimen. And then it is necessary to design a fixture of shich the fundamental natural frequency is over than one half times as high as the highest frequency of interest. But the dynamic behavior of vibration test fixture is usually different from, often far different from, what has been calculated. In this paper, the optimal dimensionless frequency parameter,
's, are calculated from the test results of a various and complex shaped fixtures.
An Automated Classification and Coding System for Structure of Injection Mold
Cho, Kyu-Kab ; Jung, Young-Deug ; Oh, Soo-Cheol ; Jung, Hyun-Seok ;
Journal of the Korean Society for Precision Engineering, volume 6, issue 3, 1989, Pages 60~67
An automated classification and coding system for structure of injection mold is developed based on the statistical analysis and the critical evaluation of the results for the sample survey of 200 assembly drawings of injection mold. The proposed system is a mixed code system consisting of 15 digits and each digit consists of 10 numerical codes. An interactive computer program is developed by using TURBO PASCAL on IBM PC/AT compatible system. A case study is discussed to show the procedure and the function of the system. The results for applications of the system to real problems show that the system works well and is useful for design, manufacturing and management of injection mold.
Effects of Rolling Numbers and Feeds on Surface Deformation in Surface Rolling of Cast Iron
Yuck, Kweng-Su ; Lee, Yong-Chul ; Kwak, Soo-Heon ;
Journal of the Korean Society for Precision Engineering, volume 6, issue 3, 1989, Pages 68~77
The surface rolling for cylindrical surface of a grey cast iron was carried out using a lathe with a simple newly-designed tool system. A surface rolling tool used was steel ball whose diameter was 3/8 inch (9.525mm) The effects of rolling feeds and number of rolling on surface rolling were investigated. The contact pressure between ball and workpiece which was considered as Hertz's contact problem was examined and the track of motion of a ball on the cylindrical surface of a work- piece was measured according to the rolling feed. The results obtained were as follows; 1. The roughness of the machined surface which was originally 5.3 .approx. 28 umRz decreased to 1.2 .approx. 5 umRz according to rolling feeds and numbers of rolling. 2. The hardness increased from Hv 260 to Hv 290 .approx. 310 through 2 .approx. 4 rollings according to the roughness of machined surfaces. 3. The reduction of diameter was found to be proportional to the variations of roughness of previous machined surfaces. About 60% to 90% of reduction in diameter was made during the first rolling process. 4. An equation relating the reduction of diameter and the variation of surface roughness after surface rolling was presented using a geometric surface model. 5. An equation for the calculation of dynamic contact area between pressure ball and workpiece according to the rolling feed was presented.
Traring instability of crack based on J-integral
Lee, Hong-Seo ; Kim, Hui-Song ;
Journal of the Korean Society for Precision Engineering, volume 6, issue 3, 1989, Pages 78~89
Applicability of tearing modulus based on J-integral proposed by Paris et al is investigated using compact tension specimens of strutural alloy steel (SCM4). Both general fracture test and instability fracture test are performed. The applied tearing modulus, (
)app estimated from the real load vs. crack growth curve measured from experiments are compared with that estimated from the limit load vs. crack growth curve. The results are : (1) the
parameter could be applied to predict crack growth instability : (2) The use of (
)app estimated from the load vs. crack growth curve, proposed in this study could be well predicted crack growth instability instead of that estimated form the limit load vs. crack growth curve.e.
A Study on the Elasto-Plastic Fracture Toughness
Evaluation of Carbon Steel
Kim, Hei-Song ; Ahn, Byoung-Uk ;
Journal of the Korean Society for Precision Engineering, volume 6, issue 3, 1989, Pages 90~99
In this study, J-integral values obtained by various methods, i.e, R-Curve, Unloading Compliance, Strectched Zone Width [SZW], and Acoustic Emission [AE] methods are investigated. Elasto-plastic fracture toughness [
] estimations by R-curve method are overestimated than those by SZW method, and those by unloading compliance method is around middle value of them. And the difference between them is little. The
value by AE method was almost agreed with that by SZW, and then proved to be useful. Crack propagation mechanism on fractography is a stable ductile fracture. For the identification of ductile fracture, both fractography analysis and AE method were applied to estimate the characteristics more precisely.
Natural Frequency of L-type Folded Plate
Lee, Kil-Woo ; Chung, Kang ;
Journal of the Korean Society for Precision Engineering, volume 6, issue 3, 1989, Pages 100~108
The frequency equation and numerical process of natural frequencies for several boundary conditions of L-type folded plate given to the different thickness and lenth are derived by using Rayleigh-Ritz method in this study. Those natural frequencies are attaind by choosing the proper eigenfunction for boundary conditions of x-direction and y-direfction beams, by considering the convergence of numerical results.
A Study on the Computer Simulation for the System Layout of Flexible Manufacturing System
Kim, Jang-Hyung ; Kim, Chong-Eok ;
Journal of the Korean Society for Precision Engineering, volume 6, issue 3, 1989, Pages 109~119
This paper discusses the system layout of flexible manufacturing system. A definition of flexible manufacturing system has not been necessarily classified yet. An understanding, and an objective of its application are different in a variety of industries. It could be treated as the system adopting flexble-Automation and FMS has been improving as a form of parts maching system. It was thought that the problems of machining function and transfer function were important. This paper introduces parts family and machine groups to increase machining function and transfer function. Parts family and machine tool groups were made up by means of multidimensional dizitizing analysis. A new software algorithm for forming parts family and machine groups has been proposed. Flexible manufacturing system was layout according to the FMS transfer function classification.