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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Transactions of the Korean Society of Mechanical Engineers A
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Journal DOI :
The Korean Society of Mechanical Engineers
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Volume & Issues
Volume 28, Issue 12 - Dec 2004
Volume 28, Issue 11 - Nov 2004
Volume 28, Issue 10 - Oct 2004
Volume 28, Issue 9 - Sep 2004
Volume 28, Issue 8 - Aug 2004
Volume 28, Issue 7 - Jul 2004
Volume 28, Issue 6 - Jun 2004
Volume 28, Issue 5 - May 2004
Volume 28, Issue 4 - Apr 2004
Volume 28, Issue 3 - Mar 2004
Volume 28, Issue 2 - Feb 2004
Volume 28, Issue 1 - Jan 2004
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Development of a Web-based Fatigue Life Evaluation System for Primary Components in a Nuclear Power Plant
Seo, Hyong-Won ; Lee, Sang-Min ; Choi, Jae-Boong ; Kim, Young-Jin ; Choi, Sung-Nam ; Jang, Ki-Sang ; Hong, Sung-Yull ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 6, 2004, Pages 663~669
DOI : 10.3795/KSME-A.2004.28.6.663
A nuclear power plant is composed of a number of primary components. Maintaining the integrity of these components is one of the most critical issues in nuclear industry. In order to maintain the integrity of these primary components, a complicated procedure is required including regular in-service inspection, failure assessment, fracture mechanics analysis, etc. Also, experts in different fields have to co-operate to resolve the integrity issues on the basis of inspection results. This integrity evaluation process usually takes long, and thus, is detrimental for the plant productivity. Therefore, an effective safety evaluation system is essential to manage the integrity issues on a nuclear power plant. In this paper, a web-based fatigue life evaluation system for primary components in nuclear power plant is proposed. This system provides engineering knowledge-based information and concurrent and collaborative working environment through internet, and thus, is expected to raise the efficiency of integrity evaluation procedures on primary components of a nuclear power plant.
Modeling on the Nonlinear Rate Sensitivity of Flow Stress
Ho, Kwang-Soo ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 6, 2004, Pages 670~676
DOI : 10.3795/KSME-A.2004.28.6.670
Most metallic materials and alloys show rate independence or negative rate sensitivity in some temperature region when dynamic strain aging occurs. It is generally recognized that negative rate sensitivity is an essential feature of dynamic strain aging that can depend on strain and/or strain rate. The unified viscoplasticity theory based on overstress is applied to reproduce a change of rate sensitivity type that depends on strain or strain rate. This is accomplished through the introduction of a single new term in the growth law of the equilibrium stress, which is a tensor valued state variable of the model. It is also shown that the new term can be used to reproduce a dramatic increase of rate sensitivity in dynamic plasticity.
Thermal Fatigue Reliability of Solder Joints in a Thin Film Optical Filter Device
Lee, Sung-Chul ; Hyun, Chung-Min ; Lee, Hyung-Man ; Kim, Myoung-Jin ; Kim, Hwe-Kyung ; Kim, Ki-Tae ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 6, 2004, Pages 677~684
DOI : 10.3795/KSME-A.2004.28.6.677
Plastic and creep deformations of solder joints during thermal cycling are the main factors of misalignments and power losses in optical telecommunication components. Furthermore, the increased mismatch between solder Joint-bonded areas may cause severe failure in the components. Darveaux`s creep model was implemented into a finite element program (ABAQUS) to simulate creep response of solder. Based on the finite element results, thermal fatigue reliability was predicted by using various fatigue life prediction models. Also, the effects of ramp conditions, dwelling time, and solder joint-embedding materials on the reliability were investigated under the thermal cycling conditions of the Telcordia schedule (-40∼75
Deformation and Failure Analysis of Heterogeneous Microstructures of Ti-6Al-4V Alloy using Probability Functions
Kim, Tae-Won ; Ko, Eun-Young ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 6, 2004, Pages 685~692
DOI : 10.3795/KSME-A.2004.28.6.685
A stochastic approach has been presented for superplastic deformation of Ti-6Al-4V alloy, and probability functions are used to model the heterogeneous phase distributions. The experimentally observed spatial correlation functions are developed, and microstructural evolutions together with superplastic deformation behavior have been investigated by means of the two-point and three-point probability functions. The results have shown that the probability varies approximately linearly with separation distance, and deformation enhanced probability changes during the process. The stress-strain behavior with the evolutions of probability function can be correctly predicted by the model. The finite element implementation using Monte Carlo simulation associated with reconstructed microstructures shows that better agreement with experimental data of failure strain on the test specimen.
The Effect of Analysis Variables on the Failure Probability of the Reactor Pressure Vessel by Pressurized Thermal Shock
Jang, Chang-Heui ; Jhung, Myung-Jo ; Kang, Suk-Chull ; Choi, Young-Hwan ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 6, 2004, Pages 693~700
DOI : 10.3795/KSME-A.2004.28.6.693
The probabilistic fracture mechanics(PFM) is a useful analytical tool to assess the integrity of reactor pressure vessel(RPV) at the event of pressurized thermal shock(PTS). In PFM, the probabilities of flaw initiation and propagation are estimated by comparing the applied stress intensity factor with the fracture toughness calculated by the simulation of various stochastic variables. It is known that the results of PFM analyses are dependent on the choice of the stochastic parameters and assumptions. Of the various variables and assumptions, we investigated the effects of the RT
shift equations, fracture toughness curves, and flaw distributions on the PFM results for the three PTS transients. The results showed that the combined effects of the RT
shift equations and fracture toughness curves are complicated and dependent on the characteristics of the transients, the chemistry of the materials, the fast neutron fluence, and so on.
Reference Stress Based J-Integral Estimates Along the Semi-Elliptical Surface Crack Front
Kim, Jin-Su ; Shim, Do-Jun ; Kim, Yun-Jae ; Kim, Young-Jin ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 6, 2004, Pages 701~708
DOI : 10.3795/KSME-A.2004.28.6.701
This paper discusses applicability of the enhanced reference stress method to estimate J-integral along the semi-elliptical surface crack front. It is found that angular variations of normalized Jintegral are strongly dependent on the geometry, loading mode and loading magnitude. As application of the reference stress approach to semi-elliptical surface cracks implies proportional increases in the normalized J-integral, the present results pose a question in applicability of the reference stress approach. However, investigation of the error in the estimated J-integral in the present work suggests that the enhanced reference stress approach, recently proposed by authors, provides an effective engineering tool fur estimating crack driving force along the semi-elliptical surface crack front.
Application of Stress Optimization for Preventing the Delamination of the Plastic IC Package in Reflow Soldering Process
Kim, Geun-Woo ; Lee, Kang-Yong ; Kim, Ok-Whan ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 6, 2004, Pages 709~716
DOI : 10.3795/KSME-A.2004.28.6.709
In order to prevent the interface delamination of an plastic IC package in the infrared (IR) soldering process, we tried to reduce stress by parameterization, sensitivity analysis and unconstraint optimization. The design variables of dimensions and material properties are determined among all the possible variables from the parametric study. Their optimized values are determined by applying the unconstraint optimization to the parameterized IC package. The maximum von-Mises stress value decreases greatly by optimum design.
System Analysis and Design for Vibration-Based Power Generation using Piezoelectric Materials
Keum, Myoung-Hun ; Kim, Kyung-Ho ; Lee, Seung-Yep ; Ko, Byoung-Sik ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 6, 2004, Pages 717~725
DOI : 10.3795/KSME-A.2004.28.6.717
A power generation systems are proposed to convert ambient mechanical vibration into electrical energy using cantilever-type piezoelectric materials. The vibration-based power device can be used for self-powered systems without batteries. This paper presents the theoretical analysis for the coupled equations of piezoelectric and structural motions and investigates the dynamic characteristics of the self-power system using transfer function method. The theoretical model is verified by the finite element analysis of the resonance frequency, the dynamic response of the structure and the sensor sensibility. Experimental results measured using a prototype system agree with the theoretical predictions. The system is shown to produce 34.5 ㎼ in average. Finally, we perform the optimal design for system variables to maximize output power.
Development of a Material Mixing Method for Topology Optimization of Multiple Material Structures
Han, Seog-Young ; Lee, Soo-Kyoung ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 6, 2004, Pages 726~731
DOI : 10.3795/KSME-A.2004.28.6.726
This paper suggests a material mixing method to mix several materials in a structure. This method is based on ESO(Evolutionary Structural Optimization), which has been used to optimize topology of only one material structure. In this study, two criterions for material transformation and element removal are implemented for mixing several materials in a structure. Optimal topology for a multiple material structure can be obtained through repetitive application of the two criterions at each iteration. Two practical design examples of a short cantilever are presented to illustrate validity of the suggested material mixing method. It is found that the suggested method works very well and a multiple material structure has more stiffness than one material structure has under the same mass.
Fracture Mechanics Analysis of Steam Generator Tubes after Shot Peening
Shin, Kyu-In ; Park, Jai-Hak ; Jhung, Myung-Jo ; Choi, Young-Hwan ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 6, 2004, Pages 732~738
DOI : 10.3795/KSME-A.2004.28.6.732
One of the main degradation mechanisms in steam generator tubes is stress corrosion cracking induced by residual stress. The resulting damages can cause tube bursting or leakage of the primary water which contains radioactivity. Shot peening technique has been used to prevent stress corrosion crack growth in steam generator tubes. In order to investigate the shot peening effect on stress corrosion cracking stress intensity factors are calculated for the semi-elliptical surface crack which is located in residual stress region. The residual stress distribution in steam generator tubes is obtained from the simple model proposed by Frederick et al.
Finite Element Analysis of Deformation Behavior During ECAP for an Aluminum Alloy Composite Model containing a SiC Particle and Porosities
Lee, Sung-Chul ; Han, Sang-Yul ; Kim, Ki-Tae ; Hwang, Sang-Moo ; Huh, Lyun-Min ; Chung, Hyung-Sik ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 6, 2004, Pages 739~746
DOI : 10.3795/KSME-A.2004.28.6.739
The plastic deformation behavior of an aluminum alloy containing a particle and porosities was investigated at room temperature during equal channel angular pressing (ECAP). Finite element analysis by using ABAQUS shows that ECAP is a useful tool for eliminating residual porosity in the specimen, and more effective under friction condition. The simulation, however, shows considerably low density distributions for matrix near a particle at which many defects may occur during severe deformation. Finite element results of effective strains and deformed shapes for matrix with a particle were compared with theoretical calculations under simple shear stress. Also, based on the distribution of the maximum principal stress in the specimen, Weibull fracture probability was obtained for particle sizes and particle-coating layer materials. The probability was useful to predict the trend of more susceptible failure of a brittle coating layer than a particle without an interphase in metal matrix composites.
Finite Element Analysis of Swaging Process for Power Steering Hose
Roh, Gi-Tae ; Jeon, Do-Hyung ; Cho, Jin-Rae ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 6, 2004, Pages 747~754
DOI : 10.3795/KSME-A.2004.28.6.747
The nonlinear finite element analysis for deformation characteristics of a power steering hose during the swaging process is performed in order to investigate the stress and the strain levels of the hose components. Power steering hose consists of components such as rubber hose, nylon, nipple and sleeve. Moreover, the numerical analysis requires the consideration of material, geometry and boundary nonlinearities. To evaluate the rubber hose strength, the measured stresses and strains are compared with tension and compression test data. Contact force is also a principal factor to examine whether rubber hose is break away from sleeve and nipple or not.
Analysis on the Hunting Motion of the KTX Power Car
Lee, Seung-Il ; Choi, Yeon-Sun ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 6, 2004, Pages 755~762
DOI : 10.3795/KSME-A.2004.28.6.755
Dynamic analysis of the KTX can predict the dynamic motions in test drive. In this study an analytical model of the KTX is developed to find the critical speed. The numerical analysis for the nonlinear equation motions of 17 degrees of freedom shows the running stability and the critical speed due to the hunting motion of the KTX. Also, the vibration modes of the KTX are calculated using the ADAM/RAIL software, which show that the critical speed occurs for the yawing modes of the car body and the bogie. Finally, this paper shows that the critical speed of the KTX could be changed with the modifications of the design parameters of wheel conicity or wheel contact length.
The Design of Parameters to Improve Actuating Performance in High Frequency Vibro-Hammer(HFVH) and the Study of Characteristic Propagation and Attenuation of Piling Vibration
Jang, Tae-In ; Park, Joon-Hyuk ; Baek, Yoon-Su ; Kim, Sung-Bae ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 6, 2004, Pages 763~773
DOI : 10.3795/KSME-A.2004.28.6.763
This paper suggests the 2 D.O.F mathematical model of the High Frequency Vibro-Hammer (HFVH), introduces an experimental method for measuring of the attenuation of piling vibration and proves what experiments are coincident with the equation of wave propagation. As vibratory installation of piles and casings has many economic merits in the construction field, most of all contractors prefer to vibratory pile driving method than the other. Compared to impact pile driving, vibratory installation has the advantage of reducing vibration or noise pollution and can drive piles under high frequency. Experiments serve estimations of capabilities and limitations of the HFVH`s excitation force and finding of sensitivity for important soil resistance parameters. Also, we discuss the HFVH that can drive with three kinds of input waves (triangular, sine and square wave) and propose the design of parameters to improve actuating performance in it.
A Study on the Convective Heat Transfer in Micro Heat Exchanger Embedded in Stacked Multi-Chip Modules
Shin, Joong-Han ; Kang, Moon-Koo ; Lee, Woo-Il ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 6, 2004, Pages 774~782
DOI : 10.3795/KSME-A.2004.28.6.774
This article presents a numerical and experimental investigation for the single-phase forced laminar convective heat transfer through arrays of micro-channels in micro heat exchangers to be used for cooling power-intensive semiconductor packages, especially the stacked multi-chip modules. In the numerical analysis, a parametric study was carried out for the parameters affecting the efficiency of heat transfer in the flow of coolants through parallel rectangular micro-channels. In the experimental study, the cooling performance of the micro heat exchanger was tested on prototypes of stacked multi-chip modules with difference channel dimensions. The simulation results and the experiment data were acceptably accordant within a wide range of design variations, suggesting the numerical procedure as a useful method for designing the cooling mechanism in stacked multi-chip packages and similar electronic applications.
Shape Design of Adhesive Joints for Strength Improvement of Epoxy Adhesive Structures
Seo, Do-Won ; Kim, Hyo-Jin ; Lim, Jae-Kyoo ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 6, 2004, Pages 783~790
DOI : 10.3795/KSME-A.2004.28.6.783
Adhesive-bonded joints are widely used in the industry. Recently, applications of adhesive bonding joints have been increased extensively in automobile and aircraft industry. The strength of adhesive joints is influenced by the surface roughness, adhesive shape, stress distribution, and etc. However, the magnitude of the influence has not yet been clarified because of the complexity of the phenomena. In this study, as the fundamental research of adhesive bonding joints, the effects of adhesive shape and loading speed on bonding strength properties and durability of aluminum to polycarbonate single-lap joints were studied. To evaluate the effect of adhesive shape, several modified shapes were used, and loading speeds were varied from 0.05 to 5 mm/min. As a result, the load-displacement distribution was shown a brittle fracture tendency. The trigonal edged single lap and bevelled lap joints showed the higher strength than the plain single lap, trigonal single lap, joggle lap and double lap joints in same adhesive area. The fractures of trigonal single lap and trigonal edged single lap joints that had the higher strength level were shown as the mixture type of the cohesive and interfacial-failure, mostly joggle lap joints that had the lower strength level were shown as the adhesive-failure.
The Prediction of Fatigue Crack Initiation Life of Cylindrical Notch Specimens Using Local Strain Approximation
Lim, Jae-Yong ; Hong, Seong-Gu ; Lee, Soon-Bok ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 6, 2004, Pages 791~798
DOI : 10.3795/KSME-A.2004.28.6.791
Fatigue crack initiation lives of round cylindrical notch specimen were investigated. Firstly, local strain approximation methods, such as the modified incremental Neuber`s rule and the modified incremental Glinka`s equivalent strain energy density(ESED) rule, were used to get multiaxial stress and strain state components at the notch tip. Based on the history of local stress and strain, multiaxial fatigue models were used to obtain fatigue crack initiation lives. Because the solution of Neuber`s rule and Glinka`s ESED rule make the upper and lower bound of local strain approximations, fatigue crack initiation lives are expected to place between life predictions by two local strain approximations. Experimental data were compared with the fatigue crack initiation life prediction results.
A Study on Optimal Combination of Design Parameters for Improving Handling Performance of a Large Truck Using Design of Experiments
Moon, Il-Dong ; Lee, Dong-Hwan ; Oh, Chae-Youn ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 6, 2004, Pages 799~806
DOI : 10.3795/KSME-A.2004.28.6.799
This paper presents a scheme for finding an optimal combination of design parameters affecting on the handling performance of a large truck using design of experiments. The average of the sum of peak-to-peak roll angles at the first and second part of the double lane is used as an objective function for design of experiments. Six design parameters are selected from all possible parameters affecting on the handling performance. The table of orthogonal arrays is made by 27 times simulations. A computational model of a large truck is developed by MSC/NASTRAN and MSC/ADAMS, and verified the reliability of it with the results of vehicle tests performed in a double lane change course. It is used for the simulations. Analyses of variance and factor effect of the table of orthogonal arrays are performed. This paper proposes an optimal combination of those six design parameters for improving the handling performance of the large truck.
Evaluation of Static Stability of Hybrid Carbody Structures of Korean Tilting Train eXpress Including Degradation Effects of Composite Materials under Ground Environments
Shin, Kwang-Bok ; Hahn, Seong-Ho ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 6, 2004, Pages 807~815
DOI : 10.3795/KSME-A.2004.28.6.807
In order to evaluate the static stability of hybrid carbody structures of Korean Tilting Train eXpress(TTX) caused by degradation of composites under ground environments, T300/AD6005 graphite/epoxy composite specimens were exposed to accelerated environmental conditions including ultraviolet radiation, temperature and moisture fer 2000 hours. It was found that the stiffness and strength of composites after aging were lower than those of unexposed specimens, and decreased as the aging time increases. The values of the degraded properties were used in the static analysis to check the static stability of hybrid carbody structures caused by environmental degradation of composites. The results shown that the structural stability of hybrid carbody structures was affected by the degradation of composites after exposure to accelerated aging environments.
Software and Hardware Development of Micro-indenter for Material Property Evaluation of Hyper-Elastic Rubber
Lee, Hyung-Yil ; Kim, Dong-Wook ; Lee, Jin-Haeng ; Nahm, Seung-Hoon ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 6, 2004, Pages 816~825
DOI : 10.3795/KSME-A.2004.28.6.816
In this work, effects of hyper-elastic rubber material properties on the indentation load-deflection curve and subindenter deformation are examined via finite element (FE) analyses. An optimal location for data analysis is selected, which features maximum strain energy density and negligible frictional effect. We then contrive two normalized functions, which map an indentation load vs. deflection curve into a strain energy density vs. first invariant curve. From the strain energy density vs. first invariant curve, we can extract the rubber material properties. This new spherical indentation approach produces the rubber material properties in a manner more effective than the common uniaxial tensile/com-pression tests. The indentation approach successfully measures the rubber material properties and the corresponding nominal stress-strain curve with an average error less than 3%.
A Study on Quality Assurance for Rotational Molding Products
Lee, Jung-Ki ; Han, Hui-Duck ; Kim, Hyun-Joo ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 6, 2004, Pages 826~837
DOI : 10.3795/KSME-A.2004.28.6.826
Rotational molding is a plastics processing technique that is ideally suited to producing relatively large, hollow, seamless parts which are partially or totally enclosed. Designers of plastic parts turn to rotational molding to produce small or large parts of unusual shape that cannot be produced as one piece by other processes, e.g., blow molding and thermoforming. In this paper, in order to enhance the quality of rotational molding plastic products, 1) surface features for the plastic products are characterized by using an image analysis system, 2) maximum tensile strength for the plastic products that are made of materials that consist of Samsung-Atofina R90lU, pigments and two different kinds of calcium carbonate (OMYA CaCO
) is measured and compared with each other by using an Instron universal testing machine, 3) thickness for the plastic products is non-destructively measured to investigate the quality of the plastic products by using an A-scan ultrasonic tester.
Densification Behavior of Metal Powder Under Warm Isostatic Pressing with a Metal Mold
Park, Jung-Goo ; Kim, Ki-Tae ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 6, 2004, Pages 838~847
DOI : 10.3795/KSME-A.2004.28.6.838
The effect of a metal mold on densification behavior of stainless steel 316L powder was investigated under warm isostatic pressing with a metal mold. We use lead as a metal mold and obtain experimental data of metal mold properties. To simulate densification behavior of metal powder, elastoplastic constitutive equation proposed by Shima and Oyane was implemented into a finite element program (ABAQUS) under warm die pressing and warm isostatic pressing with a metal mold. Finite element results were compared with experimental data for densification and deformation of metal powder under warm isostatic pressing and warm die pressing.
Mechanical Testing and Nonlinear Material Properties for Finite Element Analysis of Rubber Components
Kim, Wan-Doo ; Kim, Wan-Soo ; Kim, Dong-Jin ; Woo, Chang-Soo ; Lee, Hak-Joo ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 6, 2004, Pages 848~859
DOI : 10.3795/KSME-A.2004.28.6.848
Mechanical testing methods to determine the material constants for large deformation nonlinear finite element analysis were demonstrated for natural rubber. Uniaxial tension, uniaxial compression, equi-biaxial tension and pure shear tests of rubber specimens are performed to achieve the stress-strain curves. The stress-strain curves are obtained after between 5 and 10 cycles to consider the Mullins effect. Mooney and Ogden strain-energy density functions, which are typical form of the hyperelastic material, are determined and compared with each other. The material constants using only uniaxial tension data are about 20% higher than those obtained by any other test data set. The experimental equations of shear elastic modulus on the hardness and maximum strain are presented using multiple regression method. Large deformation finite element analysis of automotive transmission mount using different material constants is performed and the load-displacement curves are compared with experiments. The selection of material constant in large deformation finite element analysis depend on the strain level of component in service.
The Characteristics of the Milling Tool Deflection According to the Variation of Helix Angle
Maeng, Min-Jae ; Chung, Joon-Ki ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 6, 2004, Pages 860~866
DOI : 10.3795/KSME-A.2004.28.6.860
In the end milling operation the deflection of the cutter is an important factor affecting the accuracy of machining, with implications on the selection of cutting parameters and economics of the operation. Several studies were devoted to the end mill deflection and its effects, notably, providing a useful insight into the problem. Although the deflection affects adversely the accuracy, the flexibility of the cutter is beneficial in attenuating the overload in a sudden transient situation, as well as in attenuating chatter. The deflection of the end mill was studied both experimentally with strain gauge, tool dynamometer, laser measuring apparatus and on a finite element model of the cutting using ANSYS software. The deflection of machining tool with various helix angles was studied with FEM simulation and experiment. ANSYS analysis performed on the finite element model of the end mill provides deflection results which agree within 15.0% with the experimental ones.
Machine Vision Inspection System of Micro-Drilling Processes On the Machine Tool
Yoon, Hyuk-Sang ; Chung, Sung-Chong ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 6, 2004, Pages 867~875
DOI : 10.3795/KSME-A.2004.28.6.867
In order to inspect burr geometry and hole quality in micro-drilling processes, a cost-effective method using an image processing and shape from focus (SFF) methods on the machine tool is proposed. A CCD camera with a zoom lens and a novel illumination unit is used in this paper. Since the on-machine vision unit is incorporated with the CNC function of the machine tool, direct measurement and condition monitoring of micro-drilling processes are conducted between drilling processes on the machine tool. Stainless steel and hardened tool steel are used as specimens, as well as twist drills made of carbide are used in experiments. Validity of the developed system is confirmed through experiments.