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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society of Manufacturing Process Engineers
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Journal DOI :
The Korean Society of Manufacturing Process Engineers
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Volume & Issues
Volume 10, Issue 6 - Dec 2011
Volume 10, Issue 5 - Oct 2011
Volume 10, Issue 4 - Aug 2011
Volume 10, Issue 3 - Jun 2011
Volume 10, Issue 2 - Apr 2011
Volume 10, Issue 1 - Feb 2011
Selecting the target year
The Control Technology of Cutter Path and Cutter Posture for 5-axis Control Machining
Hwang, Jong-Dae ; Lim, Eun-Seong ; Jung, Yoon-Gyo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 10, issue 2, 2011, Pages 1~8
5-axis NC machining has a good advantage of the accessibility of tool motion by adding two rotary axes. It offers numerous advantages such as expanding machining fields in parts of turbo machineries like impeller, propeller, turbine blade and rotor, reasonable tool employment and great reduction of the set-up process. However, as adding two rotary axes, it is difficult to choose suitable machining conditions in terms of cutter path and cutter posture at a cutter contact point. Therefore in this paper, it is proposed to decide suitable machining condition through an experimental method such as adopting various cutter paths, cutter postures types. Also, in order to increase the efficiency of 5-axis machining, it is necessary to minimize the cutter posture changes and create a continuous cutter path while avoiding interference. This study, by using an MC-space algorithm for interference avoidance and an MB-spline algorithm for continuous control, is intended to create a 5-axis machining cutter path with excellent surface quality and economic feasibility. finally, this study will verify the effectiveness of the suggested method through verification processing.
The Postprocessor Technology of for 5-axis Control Machining
Jung, Hyoun-Chul ; Hwang, Jong-Dae ; Kim, Sang-Myung ; Jung, Yoon-Gyo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 10, issue 2, 2011, Pages 9~15
In order to develop a practical postprocessor for 5-axis machining, the general equations of numerically controlled (NC) data for 5-axis configurations with not only non-orthogonal rotary axes but also orthogonal rotary axes were exactly expressed by the inverse kinematics, and a Windows-based postprocessor written in Visual Basic was developed according to the proposed algorithm. The developed postprocessor is a general system that suitable for all kinds of 5-axis machine tool with orthogonal and non-orthogonal rotary axes. Through implementation of the developed postprocessor and verification by a cutting simulation and machining experiment, the effectiveness of the proposed algorithm is confirmed. Compatibility is improved by allowing exchange of data formats such as rotational tool center position (RTCP) controlled NC data, vector post NC data, and program object file (POF) cutter location (CL)data, and convenience is increased by adding the function of work-piece origin offset. Consequently, the technology of practical post-processor for 5-axis machining is developed.
Study of Design Technology of a Turbo-impeller
Park, Young-Ha ; Choi, Hyoung-Jun ; Kim, Chae-Sil ; Cho, Soo-Yong ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 10, issue 2, 2011, Pages 16~25
A Turbo-impeller is widely used in industries as well as in aero engines. Its design technology has been developed since the early 20th century. However, the final configuration of the impeller depends on the designers. In this study, a whole design process was introduced and an optimization method to design an impeller was studied in order to design a better impeller without influence by designers. In particular, as the Artificial Neural Network was applied to the optimization, the computational time for the optimization was equivalent to the time consumed by the gradient method and its result was guaranteed as the optimum in the whole design domain. Using this method, any impeller can be improved by selecting design variables after measuring profiles of the impeller.
A Review on the Design of a Tilting Pad Journal Bearing for a 1.2MW Turbo-blower
Jo, Hyeon-Min ; Jung, Hoon-Hyung ; Kim, Chae-Sil ; Cho, Soo-Yong ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 10, issue 2, 2011, Pages 26~31
This article provides the systematic design methodology for a tilting pad journal bearing. First the dynamic factors for the bearing are selected with the critical speed analysis. The pad bearing is then designed to have its best mechanical efficiency by simulations with changing of the number of pad and the lubricant flow rate with meeting the design specifications such as metal temperature, clearance and so on. And the simulation results are reviewed to compare with an experimental test. Finally the stability of rotor with the designed bearing is investigated. This methodology is successfully applied to the rotor for 1.2MW turbo-blower.
Development of the High Power Turbo Blower Gear
Jeon, Eon-Chan ; Lee, Woo-Hyun ; Lee, Kwon-Hee ; Park, Young-Chul ; Sung, Jang-Hyun ; Kim, Young-Hee ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 10, issue 2, 2011, Pages 32~37
This study developed Gear Automatic Design Program that users with the basic knowledge about mechanical engineering can easily model spur gears and helical gears. The Gear Automatic Design Program used Visual LISP which is an user program based on Auto CAD and made it model the gears with involute tooth by the exact mathematic definition. Also, to verify these, the reliability was secured by comparing it with a gear generated in commercial software. And we will develop nitrocarburising process and solve problems which had been caused of SCM440's dimensional changing.
A Study for the Roundness Estimation
Kim, Soo-Kwang ; Jun, Jae-Uhk ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 10, issue 2, 2011, Pages 38~45
The criteria for determining the elements are the minimum zone method(MZM) and the least squares method(LSM). The LSM is deterministic and simple but is limited at the measurements whose errors are significant compared with form errors. For the precise condition, minimum zone method(MZM) has been selected to determine the elements. The roundness is the fundamental problem in the evaluating form errors. In this paper, anew approach adapting the genius education concept is proposed to obtain an accurate results for the MZM and the LSM of the roundness. Its computational algorithm is studied on a set of measured sample data. To be of almost no account of the specification(the number and the standard deviation etc.) of the sanple data, the results shoqs excellent reliability and high accuracy in estimating the roundness.
A Study on Flow Analysis at Ball Valve according to Opening and Shutting Angle
Cho, Jae-Ung ; Han, Moon-Sik ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 10, issue 2, 2011, Pages 46~51
This study result is obtained by flow analysis according to opening and shutting angle of ball valve. As opening and shutting angle becomes larger, vortex flow becomes smaller and flow rate becomes increased. And the pressure drop is shown to be smaller at the inlet and outlet of ball. As this angle becomes larger, mass flow rate becomes increased. Its rate becomes increased abruptly in case of opening and shutting angle at more than
.This analysis result can be applied usefully with no leak at pipe system field by the optimum control of mass flow rate according to opening and shutting of ball valve.
A Study on the Relation Between Backlash and Tooth Contact for Optimization of the Conical Gear Marine Gearbox
Kang, Jai-Hwa ; Zhang, Qi ; Ahn, In-Hyo ; Lyu, Sung-Ki ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 10, issue 2, 2011, Pages 52~60
Korea is the best country for ship-building. But nowadays, the speedboat and yacht are not mostly developed yet. For the sleek lines of ship, more innovative transmission system should be obtained in the ship industry. In general, marine transmissions often use the straight shafts and the helical gears. So it makes problem that engine-room requires large space. In this case, conical gear is the best solution for this. Until now, technology of conical gear is not generalized, but it will be increased more through many applications. So, in order to get conical gear design technology by ourselves, this thesis is conducted. This paper was written to gain useful information of marine gearbox design applied conical gear through the measurement of backlash, computer analysis and tooth contact test of helical conical involute gear pairs.
Development of Atomization Spraying System for Solvent-free Paint(I) - Flow Analysis of Hydraulic Actuator -
Kim, Dong-Keon ; Kim, Bong-Hwan ; Shin, Sun-Bin ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 10, issue 2, 2011, Pages 61~66
The purpose of this paper is to design a hydraulic actuator to operate under high pressure conditions. The flow characteristics under design conditions of hydraulic actuator were numerically conducted by commercial fluid dynamic code(ANSYS CFX V11). The numerical analysis was performed by transient technique according to the variation of stroke times, which was changed from 0 to 1 second by interval of 0.01. Turbulence model, k-
SST was selected to secure more accurate prediction of hydraulic oil flow. The ICEM-CFD 11 and CFXMesher, reliable grid generation software was also adapted to secure high quality grid necessary for the reliable analysis. According to the simulation results, the flow rate which was supplied to the hydraulic actuator was 30.4
/min. These results are in good agreement with design results within 3.5% error.
Development of Atomization Spraying System for Solvent-free Paints(II) - Structural Analysis of Hydraulic Actuator -
Kim, Dong-Keon ; Kim, Bong-Hwan ; Shin, Sun-Bin ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 10, issue 2, 2011, Pages 67~72
Solvent-free paint is sprayed from higher-pressure conditions, because the viscosity is large. The hydraulic actuator which can be operated under higher-pressure condition is required to spray solvent-free paints in painting process for the environmental protection. The purpose of this paper is to develop the hydraulic actuator under higher-pressure conditions for solvent-free paint spraying system. The hydraulic actuator consists of inner spool, outer spool and ball. The analysis of a structural stability was conducted by using ANSYS V11 under the design condition of upward and downward movement of spool. As a result, the maximum von-Mises stress applied on spool under 4mm displacement showed a value of 106MPa which was greater than the allowable stress of the spool with a value of 250MPa and a value of safety factor 3. This result suggested that the spool system be unstable under the design condition so that it was necessary for the spool system to be reinforced to secure the structural stability.
Cutting Performance Evaluation of Non-Ground Cross-hole Type Milling Insert
Park, Hwi-Keun ; Kim, Taeck-Su ; Lee, Sang-Min ; Lee, Won-Suk ; Choi, Yun-Seo ; Lee, Jong-Chan ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 10, issue 2, 2011, Pages 73~78
The existent cutting insert have occupied most product of grinding style, because it has a problem of accuracy and manufacturing process. The product has a concept but development is difficult, because grinding and manufacturing by press are impossible. But by development and stabilization of a technology, preference of non-ground insert increases gradually. And then insert that grinding is impossible is developed availably as non-ground product by using developed equipment and software. In this paper reports some experimental results on the machining performance of non-ground Cutting inserts. Three kinds of Cutting inserts were manufactured without using grinding process. Machining experiments were carried out to compare the machining performance of non-ground inserts with that of ground ones. The experimental results indicate that the cutting forces and tool wear and surface roughnesses of machined surface of both ground and non-ground inserts are comparable.
Development of a Magnetic Seal and the Leak Test
Kim, Ock-Hyun ; Lee, Min-Ki ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 10, issue 2, 2011, Pages 79~83
Magnetic seal uses a magnetic fluid to seal a gap between a rotating shaft and housing. It is distinguished from other kinds of seals from the fact that solid contact does not occur in the seal. This implies that it is free from solid rubbing thus dustless and provides a clean circumstance. That is the reason why the magnetic seal is used exclusively for most of vacuum chambers in semiconductor process where dustless clean circumstance is critical. A magnetic seal has been developed of which design parameters are determined based on published data, and an air pressure test has been done to examine its sealing capability. Effects of some design parameters have been studied through FEM analysis. The results show some notable aspects of design parameters and provide suggestions for developing the seals. Regarding the sealing capacity of the magnetic seal the factor to match the theoretical value with the actual one was found to be 0.4~0.7, which means still there is some discrepancy between theory and actual.
A Study on the Heat Treatment Effect of SCM Series Gear
Ahn, Min-Ju ; Ahn, In-Hyo ; Zhang, Qi ; Lyu, Sung-Ki ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 10, issue 2, 2011, Pages 84~89
This paper studied the carburizing of chromium molybdenum steel which the heat treatment effect of gear geometric tolerance, OPD, Runout, the surface hardness, the maximum hardness, the core hardness and the bending fatigue strength were investigated. Firstly, the deformation is observed, and the results of circularity, squareness, OPD and Runout of SCM822, SCM425, and SCM415 are obtained in order. Secondly, in order to investigate the gear hardness, the surface hardness, the maximum hardness and the core hardness of SCM822, SCM425, and SCM415 are obtained; and the surface hardness of SCM822 is about 10% higher than SCM415's, and about 3% higher than SCM425's. Thirdly, the fatigue strength of SCM822 is about 10% higher than SCM415's, and about 7% higher than SCM425's in the fatigue test results. At last, for the purpose of the minimum deformation of heat treatment, and also the improvement of fatigue strength, the best gear material is SCM822 in this test.
Contact Stress Analysis of Helical Gear for Turbo Blower
Hwang, Seok-Cheol ; Lee, Dong-Hyong ; Park, Young-Chul ; Lee, Kwon-Hee ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 10, issue 2, 2011, Pages 90~95
This paper presents the study on the contact stress analysis of a pair of mating helical gears for turbo blower during rotation. Turbo blowers need high speed rotation of impeller in structure and high rate gear ratio. The use of helical gear indicated that noise was an important problem when the application involves high speeds and large power transmission. An example is presented to investigate the variation of contact stress on a pair of mating gears with contact positions. The variation of contact stress during rotation is compared with the contact stress at the lowest point of single tooth contact(LPSTC) and AGMA Equation for contact stress. In this study, the gear design considering the contact stress on a pair of mating gear is more severe than that of AGMA standard.
Hot Forging Analysis of Rotor Grip with Titanium Alloy for Unmanned Helicopter
Lee, Seong-Chul ; Kong, Jae-Hyun ; Hur, Kwan-Do ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 10, issue 2, 2011, Pages 96~103
Rotor grip is used as a component of rotor system in unmanned helicopter. Instead of usual machining, hot forging process has been considered to improve its proof stress against repeated loading conditions and crash in the farm-field. Die design and forming analysis have been performed according to the conditions such as billet volume, flash, cavity filling, and the distribution of damage during the forming by using FE analysis. In the results of analysis, the possibility of structural failure in the model has not been found because its maximum effective stress is much lower than yield strength of the titanium alloy. In the forging die design, flash has been allowed because of low production in the industrial field. Preform design was studied by using FE-analysis, and its optimal dimension was obtained in the hot forging of rotor grip with titanium alloy.
Development of Aspheric Surface Profilometry using 2nd Derivative
Kim, Byoung-Chang ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 10, issue 2, 2011, Pages 104~109
I present a method of aspheric surface profile measurement using 2nd derivative of local area profile. This method is based on the principle of curvature sensor which measures the local 2nd derivative under test along a line. The profile is then reconstructed from the data on the each point. Unlike subaperture-stiching method and slope detection method, 2nd derivative method has strong points from a geometric point of view in measuring the aspheric surface profile. The second derivative terms of surface profile is an intrinsic property of the test piece, which is independent of its position and tip-tilt motion. The curvature is measured at every local area with high accuracy and high lateral resolution by using White-light scanning interferometry.
Friction Property of Angle and Width Effect for Micro-grooved Crosshatch Pattern under Lubricated Sliding Contact
Chae, Young-Hun ; Kim, Seock-Sam ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 10, issue 2, 2011, Pages 110~116
The current study investigated the friction property of angle and width effect for micro-scale grooved crosshatch pattern on SKD11 steel surface against bearing steel using pin-on-disk type. The samples fabricated by photolithography process and then these are carry out the electrochemical etching process. We discuss the friction property due to the influence of a hatched-angle and a width of groove on contact surface. We could be explained the lubrication mechanism for a Stribeck curve. So It was found that the friction coefficient depend on an angle of the crosshatch on contact surface. It was thus verified that micro-scale crosshatch grooved pattern could affect the friction reduction. Also, it is play an important a width of groove to be improved the friction property. I was found that friction property has a relationship between a width and an angle for micro-grooved pattern.
A Study on the Coating Characteristics of SCM415 Steel
Jang, Jeong-Hwan ; Xu, Zhezhu ; Kim, Hae-Ji ; Kim, Nam-Kyung ; Lyu, Sung-Ki ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 10, issue 2, 2011, Pages 117~123
The purpose of this study is to show the friction and wear characteristics on the vapor deposited coating layers on the SCM415 steel. In this research, frictional wear characteristic of coating materials such as Ti-series, Cr-series & WC/C and TiAlN+WC/C multilayer coating was investigated under room temperature, normal air pressure and no lubricating condition. Therefore, this study carried out research on the friction coefficient, micro hardness(Hv), surface roughness and wear quantity on the vapor deposited coating layers on the SCM415 steel. As the wear experimental result, the excellence of TiAlN+WC/C multilayer coating has been proven by high micro-hardness, low friction coefficient and wear quantity.
Numerical and Experimental Prediction of Asymmetric Deformation Behavior and Its Setup Model in Plate Rolling
Byon, Sang-Min ; Lee, Young-Seog ; Jun, Eon-Chan ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 10, issue 2, 2011, Pages 124~129
The thick plate produced by rolling process is used as the basic members of a ship structure. In this paper, we present a setup model to control the asymmetric factors causing plate bending in the upper or lower direction during rolling. A series of finite element analysis are conducted to predict the relationship between various asymmetric factors and plate bending. The setup model is developed by regressing the relationship to the linear equations with several non-dimensional parameters. The setup model is verified by a pilot rolling test and applied to actual rolling conditions. Results show that the model is substantial to predict the asymmetric deformation in the plate rolling process.
Study on Structural Safety of Automotive Inner and Outer Bumper
Han, Moon-Sik ; Cho, Jae-Ung ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 10, issue 2, 2011, Pages 130~134
This study aims at the structural safety with optimum design of automotive bumper in order to minimize the maximum stress and displacement and reduce the minimum quantity of bumper material. As the forces of X and Y direction increase, equivalent stress and displacement increase. The displacement of X direction force increases more than 20% in comparison with Y direction force. But the equivalent stress of Y direction force increases more than 60% in comparison with X direction force. The mass of inner bumper becomes minimum and the mass of outer bumper becomes maximum when the force of 4000N is applied on the direction inclined at
toward outer bumper. In 50% range of increase and decrease at X and Y direction force, the optimum forces of X and Y component becomes 2368.8N and 1538.8N respectively. And the masses of inner and outer polypropylene bumper become
A Study of the Effectiveness of Hollow Ratio on Cutting Force of Diamond Core Drill
Kim, Kwang-Min ; Choi, Seong-Dae ; Hong, Young-Bae ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 10, issue 2, 2011, Pages 135~141
In this study, the variation of the cutting forces generated in the machining process were evaluated experimentally. A material of
ceramic and a tool of the dynamometer were used for the measurements of the cutting forces. With the constant rates of the feed and the tool rotation, the cutting forces were measured along three axial directions(X, Y, Z axis) for the various values of the hollow ratio. It was found that the cutting force be increasing linearly along the direction of Z axis, but along X, Y axis be not varied. Also from the viewpoint of the precesses of the hole drilling, the cutting force was found to be increasing sharply at the beginning process, but from the eighth process be increasing smoothly. As conclusions, the cutting force generated by machining for the material of
ceramic are influenced more significantly by the feed rate and the hollow ratio than by the tool rotational speed.