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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 5, Issue 4 - Dec 1988
Volume 5, Issue 3 - Sep 1988
Volume 5, Issue 2 - Jun 1988
Volume 5, Issue 1 - Mar 1988
Selecting the target year
프레스 라인의 자재.자동.공급이송시스템의 개발
Lee, Jong-Won ; Park, Jong-O ; Lee, Gwang-Jin ;
Journal of the Korean Society for Precision Engineering, volume 5, issue 1, 1988, Pages 7~11
A Study on Cutting Model for the Plastic Deformation on Turning Operation
Cha, Il-Nam ; Kim, Yoon-Jeh ;
Journal of the Korean Society for Precision Engineering, volume 5, issue 1, 1988, Pages 29~39
Plastically deformed layer beneath metal surface machined by orthogonal cutting was evaluated in terms of residual stress, microvickers hardness, side spread, and the side strain. An attempt was made to predict the depth of layer according to machining conditions particularly tool geometry and the shear plane angle. In this paper, we employed two models concerning the sliplines. The exact model was validated by comparision of computed and measured tool force and its angle, and the model offers an upper boundary of the deformed layer to be in good agreement with the experiment.
A Study on the Prediction of the Form of Chips using Cutting Forces
Lee, Sang-Jun ; Choi, Man-Seong ; Song, Ji-Bok ;
Journal of the Korean Society for Precision Engineering, volume 5, issue 1, 1988, Pages 40~49
The chip control problem is one of the important subjects to be studied in the metal cutting process. Especially, an important practical problem concerns the form of chips pro- duced in machining since this has important implications relative to : 1. Personal safety. 2. Possible damage to equipment and product. 3. Handling and disposal of swarf after machining. 4. Cutting forces, temperatures, and tool life. However, a dependable way to predict the form of chips in a wide range of cutting conditions has not been established satisfactorily. In this paper, the relationship between the form of chips and the ratios of cutting forces were studied experimentally. According to what the experiments have been carried out in the turning process the main results can be summarized as follows : 1. By use of the multiple linear regression model, emperical formulas which are suitable to wide ranges of cutting conditions with accuracy were obtained satisfactorily. 2. The correlations between the form of chips based upon the classification by Henriksen and the ratios of cutting forces, namely (feeding force/thrust force), (principal force/feeding force) were determined. 3. Using above results, the algorithms which predict the form of chips were constituted. With these algorithms, the form of chips in a wide range of cutting of cutting conditions can be predicted.
The Effect of Matrix of Compact Vermicular Graphite Cast Iron on Machinability in Lathe Turning
An, Sang-Ook ; Park, Jong-Bong ;
Journal of the Korean Society for Precision Engineering, volume 5, issue 1, 1988, Pages 50~62
An experimental investigation of the machining characteristics of compact vermicular cast iron whose matrix were formulated under two kinds of annealing conditions has been conducted. The various characteristics of the machinability of CA cast iron depending upon its matrix and cutting condition have been obtained from the experiment. The results are as follow. As depth of cut increases, the shear stress slightly decreases in order
which are classified by ferrite matrix of CV cast iron. As depth of cut increases, the normal stress increases, and annealing effect in heavy cutting is smaller than that in light cutting. The cutting energy slightly decreases, as depth of cut increases and the effect of annealing on cutting energy in light cutting is higher than that in heavy cutting. The cutting equation in this study are as follow.
Machining constants in this study for
Tool wear increases as depth of cut increases, and decreases as ferrit matrix increases.
Influence of Cutting Pressure on Laser Cut Quality (Relationship between Cutting Pressure and Cut Quality)
Yang, Yeong-Su ; Na, Seok-Ju ; Kim, Won-Bae ; Kim, Tae-Gyun ;
Journal of the Korean Society for Precision Engineering, volume 5, issue 1, 1988, Pages 63~70
Laser cutting system uses a gas jet to remove the molten or varpozed material from the workpiece. The quality of the laser cut can be strongly influenced by the gas flow charac- teristics formed through the nozzle. Laser cutting experiments were carried out for SS41 and SUS 304 to investigate the relationship between cut quality and cutting pressure. The cutting speed, nozzle pressure and nozzle to workpiece distance were also considered. The cut specimens were inspected by various manners such as dross observation, surface roughness test and kerf width measurement. Based on the data of pressure measurement on workpiece and the results of cut surface inspection, the influence of the considered cutting conditions on cut quality could be evaluated. The results of this study will be valuable in planning the optimal laser cutting process and in designing the laser cutting nozzle.
A Study on the Cutting Edge Chipping of Cemented Carbide Cut-off Tools
Kim, Won-Il ;
Journal of the Korean Society for Precision Engineering, volume 5, issue 1, 1988, Pages 71~77
This study applies dynamic deformation analysis to the rake face stress distribution of cemented carbide cut-off tools by turning, using a finite element method. The results are following: 1. The dynamic loaded state of a cut-off tool was very changeable for the first 0.6 seconds. Reaching the normal state, it became in active. 2. Chipping was influnced not only by the magnitude of stress but also by the abrupt change of tensile and compressive stresses. 3. The distribution chat of principal stress by dynamic load and the direction of resultant vector were almost constant regardless of load time.
On cutting characteristics of glass fiber reinforced plastic
Choi, Soo-Joon ;
Journal of the Korean Society for Precision Engineering, volume 5, issue 1, 1988, Pages 78~83
The purpose of this study is to understand the cutting characteristics of glass-fiber rein- forced plastic (GFRP) by investigating the variation of cutting force and surface roughness, depending on the amount fo flank wear and cutting conditions. And a Taylor type tool life equation is derived using the regression analysis. The present study reveals that, 1. Taylor's eqquation can be applicable to GFRP nd the constants n (0.170-0.175) and C (53.7- 64.4) are smaller than those in cutting of steel. 2. Principal cutting force increases sharply with the increase of feed rate, but feed force and radial force are almost constant. This result is quite different from that of metal cutting. 3. Cutting forces (
) increase with the increase of flank wear, and feed force especially increases sharply with the increase of flank wear. 4. Surface roughness changes very much along the circumference of the workpiece and the amount of flank wear has almost no effect on surface roughness.
A Study on the Dynamic Component of Cutting Force in Turning -Recognition of Chip Flow by the Dynamic Cutting Force Component-
Chung, Eui-Sik ;
Journal of the Korean Society for Precision Engineering, volume 5, issue 1, 1988, Pages 84~93
The on-line detection of the chip flow is one of the most important technologies in com- pletly automatic operation of machine tool, such as FMS and Unmanned Factories. This problem has been studied by many researchers, however, it is not solved as yet. For the recognition of chip flow in this study, the dynamic cutting force components due to the chip breaking were measured by dynamometer of piezo-electric type, and the frequency components of cutting force were also analyzed. From the measured results, the effect of cutting conditions and tool geometry on the dynamic cutting force component and chip formation were investigated in addition to the relationships between frequency of chip breaking (fB) and side serrated crack (fC) of chip. As a result, the following conclusions were obtaianed. 1) The chip formations have a large effect on the dynamic cutting force components. When chip breaking takes place, the dynamic cutting force component greatly increases, and the peridoic components appear, which correspond to maximum peak- frequency. 2) The crater wear of tool has a good effect on the chip control causing the chiup to be formed as upward-curl shape. In this case, the dymamic cutting force component greatly increases also 3) fB and fC of chip are closely corelated, and fC of chips has a large effect on the change of the situation of chip flow and dynamic cutting force component. 4) Under wide cutting conditions, the limit value (1.0 kgf) of dynamic cutting force component exists between the broken and continuous chips. Accordingly, this value is suitable for recognition of chip flow in on-line control of the cutting process.