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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
Machining Characteristics Evaluation of Super Heat-resistant Alloy(Inconel 718) According to Cutting Conditions in High Speed Ball End-milling
Kwon, Hae-Woong ; Kim, Jeong-Suk ; Kang, Ik-Soo ; Kim, Ki-Tae ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 1, 2010, Pages 1~6
Inconel 718 alloy has been applied to high temperature, high load and corrosion resistant environments due to its superior properties. However, This alloy is a difficult-to-cut nickel-based superalloy and the chipping or notch wear is mainly generated on the cutting edge of the tool. In this study, the machinability of Inconel 718 is investigated to improve tool life under various cutting conditions with TiCN-based coated ball-end mills. The cutting conditions can be suggested to improve both the tool life and machined surface quality in Inconel 718 high speed machining.
판재의 프레스가공 관련기술의 최근동향
Park, Chun-Dal ; No, Hyeon-Cheol ; Yun, Guk-Tae ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 1, 2010, Pages 5~23
AE Signal Analysis of Yttria(
) Ceramic Lapping Process
Cha, Ji-Wan ; Hwang, Sung-Chul ; Shin, Tae-Hee ; Lee, Eun-Sang ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 1, 2010, Pages 7~14
AE(acoustic emission) sensor has been used for a state monitoring and observation during a ultra-precision machining because AE signal, which has high frequency range, is sensitive enough. In case of ceramic fabrication, a monitoring of machining state is important because of its hard and brittle nature. A machining characteristic of ceramic is susceptibly different in accordance with variable machining conditions. In this study, Yttria(
) ceramic was fabricated using the ultra-precision lapping process with in-process electrolytic dressing(IED) method. And the surface machining characteristic and AE sensor signal were compared and analyzed.
An Experimental Study on the Optimal Arrangement of Cameras Used for the Robot's Vision Control Scheme
Min, Kwan-Ung ; Jang, Wan-Shik ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 1, 2010, Pages 15~25
The objective of this study is to investigate the optimal arrangement of cameras used for the robot's vision control scheme. The used robot's vision control scheme involves two estimation models, which are the parameter estimation and robot's joint angle estimation models. In order to perform this study, robot's working region is divided into three work spaces such as left, central and right spaces. Also, cameras are positioned on circular arcs with radius of 1.5m, 2.0m and 2.5m. Seven cameras are placed on each circular arc. For the experiment, nine cases of camera arrangement are selected in each robot's work space, and each case uses three cameras. Six parameters are estimated for each camera using the developed parameter estimation model in order to show the suitability of the vision system model in nine cases of each robot's work space. Finally, the robot's joint angles are estimated using the joint angle estimation model according to the arrangement of cameras for robot's point-position control. Thus, the effect of camera arrangement used for the robot's vision control scheme is shown for robot's point-position control experimentally.
Characteristics of Fatigue Behavior and Fracture Surfaces by Rotary Bending Test in SM45C Welding Zone
Lee, Yong-Bok ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 1, 2010, Pages 26~32
SM45C steel rods using generally for machine components were selected and welded by butt-GMA welding method for this study. And then they were studied about characteristics of fatigue behavior and fracture surfaces by rotary bending test. Fatigue strength in weld zone present highly in order of the boundary between deposited metal zone and heat affected zone, deposited metal zone, heat affected zone. The region of infinite life by Haigh diagram present highly in order of the boundary between deposited metal zone and heat affected zone, deposited metal zone, heat affected zone. Fatigue cracks in unnotched specimens of base metal and weld zone introduce simultaneously from extensive out-side of circumferential cross-section and propagate to the other side indicating beach markings and dimples according to consolidation of fatigue cracks. Fatigue cracks in all of notched specimens introduce simultaneously in out-side of circumferential cross-section by high stresses and propagate to center of it indicating beach markings.
Forging Process Analysis of the Multi-forging Die for the Unified Universal Pipe Joint of the Intermediate Shaft
Kwon, Hyuk-Hong ; Moon, Kwan-Jin ; Song, Seung-Eun ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 1, 2010, Pages 33~41
This study was aimed at the design of the dies for the unified pipe joint of the intermediate shaft using the computer simulation to shorten the period of production, on the basis of the process planning which was designed by the field experts. In the computer simulation, 'Deform-3d' and 'eesy-DieOpt' have been used, which are the commercial process analysis and die design program. Through the process analysis, we could know the propriety of the forming process, the inner pressure of the die and the suitable fitting pressure between the insert and the sleeve which was not showing any positive tangential stresses in the insert. Through the simulation of die design, we could know the number of the stress ring, the diameter ratios, the stresses of the die, the shrink fitting tolerance and temperature in the condition of the already determined maximum outer die diameter of the multi-stage former. The validity of the die design using the computer simulation was analyzed by the experiments and the results were satisfactory. As the results of this study, the new and easy die design system for multi-forging has been developed.
A Study on the Effectiveness of Finite Element Method in Orthogonal Cutting
Youn, Jae-Woong ; Kim, Hong-Seok ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 1, 2010, Pages 42~49
In general, the direct experimental approach to study machining processes is expensive and time consuming, especially when a wide range of parameters are included: tool, geometry, materials, cutting conditions, etc. The aim of this study is to verify the effectiveness of finite element method for orthogonal cutting process by comparing the simulated cutting forces with measured results. Two commercialized finite element codes
have been used to simulate the cutting forces in orthogonal cutting process. In this paper, estimated cutting and feed force components are compared with experimental results for different two materials. As a result, it has been found that FEM simulation is effective for understanding and predicting the orthogonal cutting process although some improvements on friction model and remeshing process are needed.
A Study on Solving Engineering Problems of a Piece-removing System using 6-Sigma DMADOV Technique with ARIZ & Brainstorming
Lee, Seong-Jo ; Chung, Won-Ji ; Lee, Choon-Man ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 1, 2010, Pages 50~56
This paper presents a new design algorithm for piece-removing dynamical system, based on 6-Sigma DMADOV technique using ARIZ and Brainstorming. Our design target is the piece-removing system installed on a mobile platform of bead-grinding equipment. The 6-Sigma DMADOV technique guides us design process according to 6 steps, i.e., Define - Measure - Analyze - Design - Optimize - Verify. A Design strategy to reduce the weight of piece-removing dynamical system will be explored by using ARIZ, i.e.,(the abbreviation of Algorithm for Inventive Problem Solving in Russian). The ARIZ will result in a final solution that the height and angle control parts for a cutting tool should be replaced by a kinematical approach, rather than complicated mechatronic approach(using motors). The Optimize step is composed of two sub-steps: (i) Generating process for obtaining several ideas of piece-removing system by using Brainstorming technique, satisfying the final solution derived from the Design step using ARIZ, and (ii) Optimizing process for selecting the most optimal idea of piece-removing system by using Pugh's matrix from the viewpoints of weight, cost and accuracy. The laststep of Verify has shown that the final design obtained by the 6-Sigma DMADOV technique with ARIZ & Brainstormingcan improve an initial design with design requirements satisfied. In this paper, we have shown that ARIZ and Brainstorming can be cooperatively merged into 6-Sigma DMADOV to give us both a formulatedproblem-solving approach and diverse candidate solutions(or ideas) without trial-and-error efforts.
A Study on the Process Capability Analysis of MIM Product
Choi, Byung-Ky ; Lee, Dong-Gil ; Choi, Byung-Hui ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 1, 2010, Pages 57~64
Metal Injection Molding (MIM) is attractive because it produces consistent, complex-geometry components for high-volume, high-strength, and high-performance applications. Also MIM using in optical communication field, display field, and semi-conductor field is a cost-effective alternative to metal machining or investment casting parts. It offers tremendous single-step parts consolidation potential and design flexibility. The objective of this paper is to study the suitability of design, flow analysis, debinding and sinterin processes, and capability analysis. The suitable injection conditions were 0.5~1.5 second filling time, 11.0~12.5 MPa injection pressure derived from flow analysis. The gravity of the product is measured after debinding an sintering. The maximum and minimum gravity levels are 7.5939 and 7.5097. the average and standard deviation are 7.5579 and 0.0122; when converted into density, the figure stands at 98.154%. According to an analysis of overall capacity, PPM total, which refers to defect per million opportunities(DPMO), stands at 166,066.3 Z.Bench-the sum of defect rates exceeding the actual lowest and highest limits-is 0.97, which translates into the good quality rate of around 88.4% and the sigma level of 2.47.
Effect of Austempering Treatment on Dynamic Characteristics of Brake Drums
Yim, K.B. ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 1, 2010, Pages 65~70
The effect of austempering treatment on the dynamic properties of a brake drum was investigated to primarily evaluate the potential damping advantage of an AGI (austempered gray iron) drum over a PGI (pearlitic gray iron) drum. This investigation provides valuable information for brake noise reduction since the brake drum is most often the outstanding component that generates the noise of the brake assembly. Test results show that the AGI drum provided slightly larger damping values than the PGI drum for the first few major resonances observed. A finite element model of a drum was also developed to aid in studying its dynamic behavior. A good correlation was obtained between the analytical results and the actual measurement data.
Assessment of Fatigue Life on Curved Self-Piercing Rivet Joint Specimen
Kim, Min-Gun ; Cho, Seok-Swoo ; Kim, Dong-Youl ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 1, 2010, Pages 71~79
One of methods that accomplish fuel-efficient vehicle is to reduce the overall vehicle weight by using aluminum structure typically for cross members, rails and panels in body and chassis. For aluminum structures, the use of Self Piercing Rivet(SPR) is a relatively new joining technique in automotive manufacture. To predict SPR fatigue life, fatigue behavior of SPR connections needs to be investigated experimentally and numerically. Tests and simulations on lap-shear specimen with various material combinations are performed to obtain the joining strength and the fatigue life of SPR connections. A Finite element model of the SPR specimen is developed by using a FEMFAT SPR pre-processor. The fatigue lives of SPR specimens with the curvature are predicted using a FEMFAT 4.4e based on the liner finite element analysis.
A Proposal of a Power Saving Hydraulic Unit and Controller Design
Yum, Man-Oh ; Lee, Sang-Yun ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 1, 2010, Pages 80~88
In a conventional system, hydraulic unit pumps out pressurized oil when the power use is not even necessary. As a result, it causes much power loss. This study is on the proposal of new hydraulic unit which controls the revolution of the pump in order to produce proper power needed and to have good response characteristic. In addition, the existing control methods such as PID control method, fuzzy control method, and adaptive control method are applied to the proposed hydraulic unit. Then the best control method is selected and the controller is developed to realize minimum power loss.
Structural Strength Analysis of Automotive Suspension
Cho, Jae-Ung ; Kwon, Oh-Beom ; Han, Moon-Sik ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 1, 2010, Pages 89~93
This paper describes the analysis of state when load applies to McPherson strut assembly. Strut assembly except knuckle-arm are created with 3 dimensional modeling program. Stress and structural strength on this model are analyzed by analysis program as load applies on the lower part of assembly modeling. When McPherson suspension is applied with 3000N at Z direction, maximum stress at spring becomes 433MPa and the cycle of minimum life is 4321. The designed modeling suspension at this study has no possibility with resonance.
Development of Expert System for the Diagnostic of NTM Decision-Making
Yoon, Moon-Chul ; Cho, Hyun-Deog ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 1, 2010, Pages 94~100
Nowadays, several nontraditional machining(NTM) processes are widely used to machine a complex and accurate shape part of hard materials, such as titanium, ceramics, high strength temperature resistant and refractory materials which are difficult to machine and having high strength, hardness, toughness. Machining of these complex shapes in such materials by traditional machining processes are very difficult. The NTM processes is important in the areas of micro- and nano scale machining, where high accuracy and superior surface characteristics are required, which can only be achieved using these NTM processes. So, for effective selection of different NTM processes, careful decision making for a given NTM application is often necessary. An appropriate NTM process for a given material and shape condition is very difficult for the novice engineers. In this paper, an expert system based on an analytic network process(ANP) is suggested for a best selection of NTM process in a NTM application considering an prior interdependency effect among various factors.
The Design of Sliding Mode Controller for Precision Stage using Genetic Algolithm
Cho, Baek-Hee ; Seong, Hwal-Gyeong ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 1, 2010, Pages 101~107
This paper presents motion control of the precision stage composed of the piezoelectric actuator and flexible hinges. The stage shows approximately 27% overshoot when the stage was applied to 30V square wave input voltage. Also, the stage shows nonlinear response characteristics including hysteresis. This paper proposes feedback control technique to suppress the phenomenon of hysteresis and overshoot using the sliding mode control scheme with the integrator. Also, this paper suggests the method that searches important parameters of sliding mode control and observer using Genetic Algorithm. To demonstrate the effectiveness of the proposed control algorithm, experimental validations are performed.
A Study on Automotive Head Lamp Design Using Layers Concept and Prototype Production by Welding on Dissimilar Materials
Lee, Jung-Hyun ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 1, 2010, Pages 108~113
Decreasing products lifecycles and increasing consumers desires for quality and design make the automotive industries try to reduce time for developing new designs. In order to reduce developing time, I have designed head lamps, which are really important to have an effect on brand identities and images, using layers concept that is one of the international automotive design trends by alias and photoshop, and produced prototype by RP. To assemble the produced prototype to the body and manufacture the frame to exterior modelling efficiently, I have studied on joining dissimilar materials of aluminum alloy that can make the prototype lighter and stainless steel, which is good for corrosion resistance by using laser beam. These materials were welded for finding the optimum joining condition and evaluating the soundness of joining zone. The joining was performed under the condition of laser power 500, 550, 575, 600W and 11~14Hz. In this study, the suitable joining condition between aluminum alloy (Al 2024) and stainless steel (STS 304) can be obtained at the laser power 575W and frequency 12Hz.
Global Optimization of the Turning Operation Using Response Surface Method
Lee, Hyun-Wook ; Kwon, Won-Tae ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 1, 2010, Pages 114~120
Optimization of the turning process has been concentrated on the selection of the optimal cutting parameters, such as cutting speed, feed rate and depth of cut. However, optimization of the cutting parameters does not necessarily guarantee the maximum profit. For the maximization of the profit, parameters other than cutting parameters have to be taken care of. In this study, 8 price-related parameters were considered to maximize the profit of the product. Regression equations obtained from RSM technique to relate the cutting parameters and maximum cutting volume with a given insert were used. The experiments with four combinations of cutting inserts and material were executed to compare the results that made the profit and cutting volume maximized. The results showed that the cutting parameters for volume and profit maximization were totally different. Contrary to our intuition, global optimization was achieved when the number of inserts change was larger than those for volume maximization. It is attributed to the faster cutting velocity, which decreases processing time and increasing the number of tool used and the total tool changing time.
A Study on Robust Trajectory Tracking Control of a Skid Steering Robots
Baek, Woon-Bo ; Kim, Won-Ho ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 1, 2010, Pages 121~127
We consider the robust trajectory tracking control problem for a skid steering mobile robots. A dynamic model is derived accounting for the effects of wheel skidding. The control design utilizes the dynamic feedback linearization techniques, so as to obtain a predictable behavior for the instantaneous center of rotation thus preventing excessive skidding. The additive controller using the sliding mode type is then robustified against the unmodelled dynamics and parameter uncertainty. Simulation results show the good performances under excessively uncorrected estimations of the longitudinal forces and the lateral resistive forces caused by the skidding of the wheels in tracking trajectories.
A Study on the Machinability of Ti-6Al-4V Alloy
Park, Jong-Nam ; Kim, Jae-Yoel ; Cho, Gyu-Jae ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 1, 2010, Pages 128~133
The Titanium has many superior characteristics which are specific strength, heat resistance, corrosion resistance, organism compatibility, non-magnetic and etc. and their quantity are abundant. this study performed turning operation of Ti-6Al-4V alloy using the TiAlN Coated Tool which treated Physical Vapor Deposition. Experimental works are also executed to measure cutting force, tool wear, chip figuration and surface roughness for different cutting conditions. As a result of study. Cutting depth influences on the cutting force much more than the feed rate and the value of the cutting force is the most stable at the depth of 1.0mm. And tool wear was serious at over 100m/min of cutting speed and cutting condition was excellent at 1.0mm of cutting depth.
A Study on Performance Improvement of Gear Type Vane Damper in FD Fan - Productivity Increases & Construction Improvement -
Jang, Sung-Cheol ; Han, Sang-Ho ; Kim, Jin-Woo ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 1, 2010, Pages 134~139
In this study, we developed the gear type vane damper replacing the link type through gear design using Finite Element Analysis(FEA). FEA about the pinion and the vane shaft in the boss of gear type damper for quality improvement was accomplished. We analyzed fluid flow according to angular displacement. Catched the problem of the torque and backlash bring to the pinion as structure improvement of the forced draft fan(FD FAN). Finally, we compared the gear driving result with simulation. It is the objective of the present study to identify a nonlinear flow rate control of gear type vane damper and to suggest a damper shape with a linear flow rate control. This study is related to the development of gear type vane damper change link type in forced draft fan.
Compressive Strength of Natural Fiber Reinforced Polymer Composites
Song, Jun-Hee ; Mun, Sang-Don ; Kim, Yoo-Young ; Kim, Hong-Gun ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 1, 2010, Pages 140~144
In recent years there has been a growing interest for the use of natural fibers in composite applications due to their low cost, environmental friendliness, and good mechanical properties. The purpose of this study is to determine the characteristic of bending strength on bamboo fiber reinforced polymer composites. The parameters of RTM process depend on the weight ratio of bamboo fiber and resin, the number of bamboo ply and amount of hardening agent. Besides the existence of pore in composites according to vacuum time investigated a effect on mechanical properties of reinforced polymer composites. Test result shows that compressive strength was a maximum(approximately 1,840kgf/
) value when weight ratio of resin was 12%.
Robust Real-time Control of Autonomous Mobile Robot Based on Ultrasonic and Infrared sensors
Nguyen, Van-Quyet ; Han, Sung-Hyun ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 1, 2010, Pages 145~155
This paper presents a new approach to obstacle avoidance for mobile robot in unknown or partially unknown environments. The method combines two navigation subsystems: low level and high level. The low level subsystem takes part in the control of linear, angular velocities using a multivariable PI controller, and the nonlinear position control. The high level subsystem uses ultrasonic and IR sensors to detect the unknown obstacle include static and dynamic obstacle. This approach provides both obstacle avoidance and target-following behaviors and uses only the local information for decision making for the next action. Also, we propose a new algorithm for the identification and solution of the local minima situation during the robot's traversal using the set of fuzzy rules. The system has been successfully demonstrated by simulations and experiments.