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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of The Korean Society of Manufacturing Technology Engineers
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Journal DOI :
The Korean Society of Manufacturing Technology Engineers
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Volume & Issues
Volume 19, Issue 6 - Dec 2010
Volume 19, Issue 5 - Oct 2010
Volume 19, Issue 4 - Aug 2010
Volume 19, Issue 3 - Jun 2010
Volume 19, Issue 2 - Apr 2010
Volume 19, Issue 1 - Feb 2010
Selecting the target year
5축 가공을 위한 NC데이터 후처리 생성 기술
Jeong, Yung-Ho ; Yun, Jae-Deuk ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 5, 2010, Pages 5~12
다그룹 다계통 지원이 가능한 수치제어장치 개발
Seong, Dae-Jung ; Jeong, Dae-Hyeok ; Jang, Tae-Seong ; Kim, Chong-Tae ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 5, 2010, Pages 13~21
Reliability-Based Shape Optimization Under the Displacement Constraints
Oh, Young-Kyu ; Park, Jae-Yong ; Im, Min-Gyu ; Park, Jae-Yong ; Han, Seog-Young ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 5, 2010, Pages 589~595
This paper presents a reliability-based shape optimization (RBSO) using the evolutionary structural optimization (ESO). An actual design involves uncertain conditions such as material property, operational load, poisson's ratio and dimensional variation. The deterministic optimization (DO) is obtained without considering of uncertainties related to the uncertainty parameters. However, the RBSO can consider the uncertainty variables because it has the probabilistic constraints. In order to determine whether the probabilistic constraint is satisfied or not, simulation techniques and approximation methods are developed. In this paper, the reliability-based shape design optimization method is proposed by utilization the reliability index approach (RIA), performance measure approach (PMA), single-loop single-vector (SLSV), adaptive-loop (ADL) are adopted to evaluate the probabilistic constraint. In order to apply the ESO method to the RBSO, a sensitivity number is defined as the change of strain energy in the displacement constraint. Numerical examples are presented to compare the DO with the RBSO. The results of design example show that the RBSO model is more reliable than deterministic optimization.
Finite element analysis for dynamic behavior of a machine tool structure fed in open loop control
Choi, Jin-Woo ; Lee, Tae-Hong ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 5, 2010, Pages 596~602
In this study, a fmite element model was developed for analysis of feeding a structure in open loop control The finite element analysis (FEA) can simulate dynamic behavior of the structure of a machine tool rapidly traveling with a screw feeding driving system. The feeding mechanism was implemented with screw element of the FEA tool used in this study. The procedure was developed for the dynamic transient FEA. First, motion parameters such as jerk and velocity were introduced for the structure to be fed in open loop control When its traveling distance was determined, set-points for the distance were generated based on the motion parameters. The set-points were applied to the FE model constructed for the traveling structure. The FEA was executed and evaluated. In this study, the FEA procedure was applied to the column of a machine tool and the dynamic behavior of the column was evaluated. The FEA helps in evaluation of the motion characteristics of a structure. The convergence time of the structure vibration posterior to feeding termination can be estimated and the stiffness of the flexible structure is also evaluated against jerk, and acceleration. It provides the feeding force which is helpful in selection of the feeding motor.
Energy Absorption Characteristics of CFRP/Foam Circular Members according to Interface Number
Choi, Ju-Ho ; Lee, Kil-Sung ; Yang, In-Young ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 5, 2010, Pages 603~608
In this study, one type of circular shaped composite tube was used, combined with reinforcing foam and without foam. Furthermore, CFRP(Carbon Fiber Reinforced Plastic) circular member manufactured from CFRP prepreg sheet for lightweight design. CFRP is an anisotropic material which is the most widely adapted lightweight structural member. The crashworthy behavior of circular composite material tubes subjected to static axial compression under same conditions is reported in this paper. Test was executed in order to compare the results to the energy absorption and collapse shape. The collapse mode during the failure process were observed and analyzed. The behavior of polymeric foams to the tubes crashworthiness were also investigated. According to the experimental results, specimens filled with foam are higher total energy absorption than the other specimens not filled with the foam.
Design Tolerance of High Speed Spindle considering the Variation of Ball Contact Angle in the Angular Contact Ball Bearings
Lee, Chan-Hong ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 5, 2010, Pages 609~615
Angular contact ball bearings in a high speed spindles are under the extreme conditions, such as high temperature, big centrifugal force and thrust cutting forces. So, the assembly contacts between spindle shaft and inner ring bearings, bearing housing and outer ring of bearings are occasionally unstable at high speed revolution. Furthermore, the ball contact angle of a bearing, which influence stiffness and lifetime of bearings, are changed according to loads and rotational speed. To analyze internal forces of a bearing under high speed revolution, the ball contact are calculated using nonlinear equations in consideration of rotational speed, thrust loads and raceway form. Diameter increase of inner and outer ring by influence factors, such as internal forces to inner and outer ring, centrifugal force and temperature of inner and outer rings are calculated to establish stable state in bearing assembly in high speed spindle. Finally, contribution ratio of influence factor to assembly design tolerance of inner and outer rings are shown and the stable assembly design tolerance are proposed.
Thick Copper Substrate Fabrication by Air-Cooled Lapping and Post Polishing Process
Lee, Ho-Cheol ; Kim, Dong-Jun ; Lee, Hyun-Il ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 5, 2010, Pages 616~621
New type of the base material of the light-emitting diode requires copper wafer in view of heat and electrical conductance. Therefore, polishing process of the substrate level is needed to get a nanometer level of surface roughness as compared with pattern structure of nano-size in the semiconductor industry. In this paper, a series of lapping and polishing technique is shown for the rough and deflected copper substrate of thickness 3mm. Lapping by sand papers tried air cooling method. And two steps of polishing used the diamond abrasives and the
slurry of size 100mm considering the residual scratch. White-light interferometer proved successfully a mirror-like surface roughness of Ra 6nm on the area of
A Study on the Rotating Ring Using Air Bearing in Yarn Manufacturing Process
Jang, Seung-Ho ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 5, 2010, Pages 622~630
The increase of the spindle speed to enhance the productivity in ring spinning processes has been limited by yarn tension and heat generation of the traveller/ring. The main causes of yarn tension are 1) the force added directly to the yarn by the rotation of the spindle and 2) the centrifugal force exerted by the yarn balloon generated by traveller rotation. The dominant causes of heat generation are 1) the friction between the ring and traveller and 2) the friction between the traveller and yarn. These factors cause yarn end-breaks and heat damage. In the case of the staple yarn manufacturing process for PET (polyester) and nylon (a heat plasticity material), the rotational speed of the ring spinning system has deteriorated to 10,000rpm. The objective of this study was to develop a rotating ring which has dynamic stability, high productivity and a simple structure to overcome the limitations of the conventional fixed ring/traveller system. The results of this study revealed that the spinning tension could be reduced by 67.8% using the newly developed rotating ring.
Cutting Characteristic of SNCM420H steel for Ship Engine Supply Unit
Choi, Won-Sik ; Sung, Bong-Soo ; Kang, Chang-Won ; Mun, Hee-Joon ; Kwon, Ju-Ri ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 5, 2010, Pages 631~636
SNCM420 steel is one of the cam shaft materials which are used in the supply unit for ship engine cam shaft. In this study the assessment of cutting behavior was conducted for the SNCM 420 steel and SM45C steel with various cutting conditions as depth of cut 0.5, 1.0, 1.5, 2.0mm and feed rate 0.1~0.3m/rev. The controlled chip was produced in feed rate 0.2, depth of cut 1.0 for SNCM420 and feed rate 0.2, depth of cut 2.0 for SM45C. There is no difference cutting force between SM45C and SNCM420 steels.
Reliability-based Shape Optimization Using Growth Strain Method
Oh, Young-Kyu ; Park, Jae-Yong ; Im, Min-Gyu ; Park, Jae-Yong ; Han, Seog-Young ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 5, 2010, Pages 637~644
This paper presents a reliability-based shape optimization (RBSO) using the growth-strain method. An actual design involves uncertain conditions such as material property, operational load, Poisson's ratio and dimensional variation. The purpose of the RBSO is to consider the variations of probabilistic constraint and performances caused by uncertainties. In this study, the growth-strain method was applied to shape optimization of reliability analysis. Even though many papers for reliability-based shape optimization in mathematical programming method and ESO (Evolutionary Structural Optimization) were published, the paper for the reliability-based shape optimization using the growth-strain method has not been applied yet. Growth-strain method is applied to performance measure approach (PMA), which has probabilistic constraints that are formulated in terms of the reliability index, is adopted to evaluate the probabilistic constraints in the change of average mises stress. Numerical examples are presented to compare the DO with the RBSO. The results of design example show that the RBSO model is more reliable than deterministic optimization. It was verified that the reliability-based shape optimization using growth-strain method are very effective for general structure. The purpose of this study is to improve structure's safety considering probabilistic variable.
Vibration Suppression Control of Two Cooperating Flexible Manipulators
Kim, Jin-Soo ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 5, 2010, Pages 645~652
For free motions, vibration suppression of single flexible manipulators has been one of the hottest research topics. However, for cooperative motions of multiple flexible manipulators, a little effort has been devoted for the vibration suppression control. So, the aim of this paper is to develop a hybrid force/position control and vibration suppression control scheme for multiple cooperation flexible manipulators handling a rigid object. In order to clarify the discussion, the motions of dual-arm experimental flexible manipulator are considered. Using the developed model, we control a robotic system with hybrid position/force control scheme. Finally, Experiments are performed, and a comparison of experimental results is given to clarify the validity of our control scheme.
Comparative Study on the Fatigue Properties of FSW and MIG Joints of A16005 Sheets to Design Railway Vehicles
Choi, Won-Doo ; Ko, Jun-Bin ; Gu, Gi-Yong ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 5, 2010, Pages 653~659
Friction stir welding results in low distortion and high joint strength compared with other welding procedures, and is able to join all aluminium alloys that are not considered as virtually weldable with classical liquid state techniques. The comparative study on high cycle fatigue properties between A16005-T6 friction stir welds and MIG weld joints have been performed and fracture mechanisms for the fatigue specimens were investigated. Although mechanical properties are lower than the corresponding base material, FSW joints of A16005-T6 become higher at tensile and fatigue strength in comparison with the traditional fusion weld(MIG). The fracture surfaces of FSW and MIG fatigue specimens cleary show different aspects of the fracture morphology. MIG weldments were characterized by voids and cleavage(brittle fracture) but FSW specimens showed the presence of ductile fracture surface.
Effects of Mold Precision in Micromini Cellphone Optical Systems
Ye, In-Soo ; Cheong, Seon-Hwan ; Choi, Seong-Dae ; Hyun, Dong-Hoon ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 5, 2010, Pages 660~666
In cellphone optical systems, a tiny difference of manufacturing has a strong influence on camera lenses. This study aims to find out the worst result by tolerances come from all parts in optical performance. First, 3D Measure Instrument, Roundness Measure Instrument, and Wavelength Measure Instrument were used for greater precision by making and measuring the parts to see how different from the drawings. It was confirmed that even narrow tolerances could result in defects by assembling. Tolerances in assembly should be concerned as those in parts through the research.
Development of Flange Flexible Urethane-key Coupling
Cho, Young-Tae ; Lee, Ki-Yong ; Lee, Choong-Ho ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 5, 2010, Pages 667~671
The study was aimed at developing a power transmission coupling that is possible to transfer power without any trouble even if the two rotating shafts are making minute misalignment. The coupling that has been developed is Flange Flexible Urethane-key Coupling that connects two shafts by flanges with Urethane-key. A model coupling for use in transmitting power of 10hp was made and undergone performance evaluation and tests. Property and usefulness was proved through the test. The performance evaluation has demonstrated a property of
of allowable torque and 28.25hp of power at 1,80Orpm, which was found to be superior compared to the performance of similar couplings. Based on the performance test, study was made also for improving the shape of the Urethane-key and was successful to make the flange in smaller outside diameter. Further application test at site has proved that the product is easy to install and maintain, and has property of absorbing minute misalignment between two shafts and vibration caused there from.
A Study on the Estimation of the Flat Zone Length by using Image Processing
Roh, Dae-Ho ; Park, Hwan-Seo ; Lee, Hong-Guk ; Shin, Kwan-Soo ; Yoo, Song-Min ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 5, 2010, Pages 672~677
The goal of this study is to simplify the measurement process of the flat zone length produced by a flexible disk grinding system for the process automation. The image of workpiece in the grinding process is obtained, and the cutting speed and the feeding speed are controlled carefully to maximize the flat zone length. The gradient, the inflection point and the length of the line in the image are calculated, and the length is also measured by using a projector. Processing conditions and inversely proportional to flat zone length was changing. The flat zone length is estimated by Neural network algorithm considering the process conditions with the estimated error range as 0.06~3.61%, the Neural network algorithm for the grinding process estimation is found to be useful for building the process automation database.
5-Axis CNC Machining for Drum Cam with Rotational Follower - I (Post Processing Method for Rough Machining)
Cho, Hyun-Deog ; Yoon, Moon-Chul ; Kim, Kyung-Jin ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 5, 2010, Pages 678~683
The drum cam with rotational follower is used to apply the ATC and index table of machine tools and it has the merit of minimizing the backlash. In general, to machine the drum cam with rotational follower, 5-axis CNC machine must be used and its kinematic principle must be included in modeling on CAM. So, the commercialized CAM software can't be applied to this machining of drum cam. Though some special software for machining drum cam was developed, it could be applied to special 5-axis CNC machine tools and the finish machining module was not applied. To solve this problem, this study includes the induction of the post processing algorithm for the rough machining of drum cam on several 5-axis CNC machine tools, type AC, AB and Be. The finish machining software will be treated in next study. A sample drum cam was machined on 5-axis CNC machine tool of AC type. The designed geometric profile of drum cam consist to the measured profile after machining well. This post processing algorithm for rough machining of the drum cam was clearly verified.
5-Axis CNC Machining for Drum Cam with Rotational Follower - II (Post Processing Method for Fine Machining)
Cho, Hyun-Deog ; Yoon, Moon-Chul ; Kim, Kyung-Jin ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 5, 2010, Pages 684~690
A drum cam with rotational follower has a cam mechanism and it is mainly used in its application such as index table and ATC of machine tool. Also its use can reduce the backlash in its kinematic movement. To machine the drum cam with rotational follower, 5-axis CNC machine tool is generally used and its kinematic principle is included in it's design. Until now, the commercialized CAM software can't cover the application of the drum cam machining. Even if, some special software was developed for machining a drum cam, the post processing method for finish machining was not developed yet. And to overcome the problem, the form tool is still used on the tool path of rough machining. This study includes the induction of the post processing technique for the finish machining of drum cam on three 5-axis CNC machine tools, type AC, AB and BC. To prove the finishing geometric profile, the result was clearly verified through inspection and geometric measurement after direct machining of the drum cam in AC type 5-axis machine tool in this study.
Topology Optimization of the Inner Reinforcement of a Vehicle's Hood using Reliability Analysis
Park, Jae-Yong ; Im, Min-Kyu ; Oh, Young-Kyu ; Park, Jae-Yong ; Han, Seog-Young ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 5, 2010, Pages 691~697
Reliability-based topology optimization (RBTO) is to get an optimal topology satisfying uncertainties of design variables. In this study, reliability-based topology optimization method is applied to the inner reinforcement of vehicle's hood based on BESO. A multi-objective topology optimization technique was implemented to obtain optimal topology of the inner reinforcement of the hood. considering the static stiffness of bending and torsion as well as natural frequency. Performance measure approach (PMA), which has probabilistic constraints that are formulated in terms of the reliability index, is adopted to evaluate the probabilistic constraints. To evaluate the obtained optimal topology by RBTO, it is compared with that of DTO of the inner reinforcement of the hood. It is found that the more suitable topology is obtained through RBTO than DTO even though the final volume of RBTO is a little bit larger than that of DTO. From the result, multiobjective optimization technique based on the BESO can be applied very effectively in topology optimization for vehicle's hood reinforcement considering the static stiffness of bending and torsion as well as natural frequency.
Development of the Sorting Inspection System for Screw/Bolt Using a Slant Method
Kim, Yong-Seok ; Yang, Soon-Yong ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 5, 2010, Pages 698~704
The machine vision system has been widely applied at automatic inspection field of the industries. Especially, the machine vision system shows good performance at difficult inspection field by contact method. In this paper, the automatic system of a slant method to inspect screw/bolt shape using machine vision is developed. The inspection system uses pattern matching method that search similar degree of the lucidity, the average lucidity, length and angle of inspection set up area using a circular scan and a line scan method. Also the feeding method for inspection product is the slant method, and feed rate is controlled by the ramp angle adjustment. This inspection system is composed of a feeding device, a transfer device, vision systems, a lighting device and computer, and is composed the sorting discharge system of the inferior product. The performance test carried out the feeding speed, the shape correct degree and the sorting discharge speed according to the type of screw/bolt. This sorting inspection system showed a satisfied test results in whole inspection items. Presently, this sorting inspection system is being used in the manufacturing process of screw/bolt usefully.
Simple Analysis of the Properties of Condenser Lens 1 in SEM
Lim, Sun-Jong ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 5, 2010, Pages 705~709
It is quite complex to draw the geometry of electron trajectories in electron optics because such trajectories have various aberrations that cannot be easily calculated. However, if we need to know roughly the geometry, the focal length and the principal planes in order to understand the properties of column, a simple numerical solution can be a useful method. We are developing the electron beam machining system based on SEM. In this paper, we show rough geometry, focal length and principal planes by a numerical solution for electron lens I in our column. These results will be utilized in developing a simulation program for electron optics.
Development of Automatic Tool Change System of the SMA-Based Tool Clamping Device
Shin, Woo-Cheol ; Ro, Seung-Kook ; Kim, Byung-Sub ; Park, Jong-Kweon ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 5, 2010, Pages 710~715
This study developed an automatic tool change system of the SMA-based tool clamping device for applications of micro-machine tools. This paper first describes clamping and unclamping procedures of the automatic tool change system and its basic configuration. Second, it presents fabrication techniques of components, such as a heating/cooling system and a tool loader. Finally, it describes automatic tool change test conducted with a prototype in which the fabrication techniques of components were employed. As the results of the test, times needed for clamping and unclamping operations were estimated to 18(s) and 8(s) respectively. The experimental results confirm that the proposed automatic tool change system can be sucessfully applied to micro-machine tools.