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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 22, Issue 4 - Apr 1998
Volume 22, Issue 3 - Mar 1998
Volume 22, Issue 2 - Feb 1998
Volume 22, Issue 1 - Jan 1998
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A study on the evaluation of control performance of active muffler for exhaust noise control
Kim, Heung-seob ; Shon, Dong-Gu ; Oh, Jae-Eung ;
Transactions of the Korean Society of Mechanical Engineers A, volume 22, issue 2, 1998, Pages 251~257
DOI : 10.22634/KSME-A.19184.108.40.206
Active mufflers have been mainly applied in the large industrial engine due to considerable expense for implementation, but a necessity of development has been increased by the tightened regulation of exhaust noise and the request of high power. In this study, the active muffler prototype for installing in an automobile is designed and constructed. The active muffler is designed so that the primary noise and the control sound are propagated as a plane wave in the outlet. Therefore, the error microphone could be placed outside the high temperature centers of the tail pipe, and the noise radiating to the outside could be reduced in the whole areas around the outlet. For evaluating the control performance of the prototype, the control experiments of band-pass filtered random signal and the modulation of sinusoidal signal which are generated from the primary noise speaker as practical exhaust sound level are implemented. And to investigate the radiation pattern from the outlet of tail pipe and the noise reduction level of points placed adjacent to the outlet, the sound level of adjacent points of thirty is measured.
Residual fatigue life evaluation method for the cracked components under complex stress fields
Cho, Chang-Hee ; Kim, sang-Tae ; Kwon, Jae-Do ;
Transactions of the Korean Society of Mechanical Engineers A, volume 22, issue 2, 1998, Pages 258~267
DOI : 10.22634/KSME-A.19220.127.116.118
This study reviews the influence function method(IFM) for calculating stress intensity factors (SIFs, K) and modifies it to apply for the estimating the residual fatigue life for the cracked components under complex stress fields. An IFM has been developed to analyze SIFs for surface cracks which are subjectedto nonuniformly distributed stresses. Through elastic superposition, the influence function method properly accounts for redistribution of stress as the crack grows through the component. This influence function is unique to the given geometry and independent of the loading. Some examples have been provided to show the effectiveness of the IFM including the distributions of K in a residual stress field. The significant effect of residual stress upon fatigue crack growth in a welded component has been demonstrated with the IFM.
Determination of non-uniform residual stress by the hole drilling method
Ju, Jin-Won ; Park, Chan-Gi ;
Transactions of the Korean Society of Mechanical Engineers A, volume 22, issue 2, 1998, Pages 268~277
DOI : 10.22634/KSME-A.1918.104.22.1688
The numerical procedure for calculating non-uniform residual stress fields by using relieved strain data from incremental hole drilling method is presented. Finite element calculations are described to evaluate the relieved coefficients required for the determination of residual stresses. From the results of simulations it is found that this numerical method is well adopted to measuring non-uniform residual stress in the hole depth range of 0.8 times of the hole diameter from the surface. In order to examine the practicability of this method, the hole drilling procedure for the four point bending test is performed. This method is applied to the measurement of residual stresses in the cold-rolled steel pipe. It is shown that the magnitude of residual stress in the pipe is not negligible when compared with yield stress and the residual stress should be duly considered in designing structures with this pipes.
A study on the improvement of the local stress field in a displacement-formulated finite element solution
Song, Kee-Nam ;
Transactions of the Korean Society of Mechanical Engineers A, volume 22, issue 2, 1998, Pages 278~288
DOI : 10.22634/KSME-A.1922.214.171.1248
An efficient and useful method to improve the local stress field in a displacement-formulated finite element solution has been proposed using the theory of conjugate approximations for a stress field and the Loubignac's iterative method for a displacement field. Validity of the proposed method has been tested through three test examples, to improve the stress field and displacement field in the whole domain and the local regions. As a result of analysis on the test examples, it is found that the stress field in the local regions are approximated to those in the whole domain within a few iterations which have satisfied the original finite element equilibrium equation. In addition, it is found that the local stress field are by far better approximated to the exact stress field than the displacement-based stress field with the reduction of the finite-element mesh-size.
Numerical Modeling of Injection/Compression Molding for Center-gated Center-gated Disk (Part I)
Kim, Ilhwan ; Park, Seong-Jin ; Chung, Seong-Taek ; Kwon, Tai-Hun ;
Transactions of the Korean Society of Mechanical Engineers A, volume 22, issue 2, 1998, Pages 289~301
DOI : 10.22634/KSME-A.19126.96.36.1999
The present study attempted to numerically simulate the process in detail by developing an appropriate physical modeling and the corresponding numerical analysis for precision injection and injection/compression molding process of center-gated disk. In part I, a physical modeling and associated numerical analysis of injection molding with a compressible viscoelastic fluid model are presented. In the distribution of birefringence, the packing procedure results in the inner peaks in addition to the outer peaks near the mold surface, and values of the inner peaks increase with the packing time. Also, values of the density in the core region increase with the packing time. From the numerical results, we also found that birefringence becomes smaller as the melt temperature gets higher and that it is insignificantly affected by the flow rate and the mold temperature. As far as the density distribution is concerned, mold temperature affected the distribution of density especially near the wall. But it was not significantly affected by flow rate and melt temperature. Numerical results of birefringence coincided with experimental data qualitatively but didn't quantitatively.
Numerical Modeling of Injection/Compression Molding for Center-gated Center-gated Disk (Part II)
Kim, Ilhwan ; Park, seong-Jin ; Chung, Seong-Taek ; Kwon, Tai-Hun ;
Transactions of the Korean Society of Mechanical Engineers A, volume 22, issue 2, 1998, Pages 302~310
DOI : 10.22634/KSME-A.19188.8.131.522
In the accompanying paper, part I, we have presented the physical modeling and the associated numerical analysis of injection molding process with a compressible viscoelastic fluid model. In part II, the effects of compression stage in the injection/compression molding process are presented. Numerical results showed that the injection/compression molding process reduced birefringence as compared with the injection molding process. In this respect, one can conclude that the injection/compression molding process is more suitable for manufacturing the precise optical products than the injection molding process. In the distribution of birefringence, the effect of packing procedure in injection/compression molding process was found to be similar to that in injection molding process. From the numerical results, we found that birefringence becomes smaller as the melt temperature gets higher and the closing velocity of the mold gets smaller with the flow rate and the mold temperature affecting the birefringence insignificantly. As far as the distribution of density is concerned, the flow rate, the melt temperature, and the closing velocity of the mold had insignificant effect on the distribution of density in comparison with the mold temperature.
Cryogenic fracture behaviors and polarization characteristics according to sensitizing heat treatment on structural material of the nuclear fusion reactor
Kwon, Il-Hyun ; Chung, Se-Hi ;
Transactions of the Korean Society of Mechanical Engineers A, volume 22, issue 2, 1998, Pages 311~320
DOI : 10.22634/KSME-A.19184.108.40.2061
The cryogenic fracture behaviors of austenitic stainless steel HN2 developed for nuclear fusion reactor were evaluated quantitatively by using the small punch(SP) test. The electrochemical polarization test was applied to study thermal aging degradation of HN2 steel. The X-ray diffraction(XRD) analysis was conducted to detect carbides and nitrides precipitated on the grain boundary of the heat treated HN2 steel. The mechanical properties of the HN2 steel significantly decreased with increasing time and temperature of heat treatment or with decreasing testing temperature. The integrated charge(Q) obtained from electrochemical polarization test showed a good correlation with the SP energy(ESP) obtained by means of SP tests. From the results observed in the x-ray diffraction and anodic polarization curve, it was known that the material the grain boundary. Combining SP test and electrochemical polarization test, it could be useful tools to non-destructively evaluate the cryogenic fracture behaviors and the aging degradation for cryogenic structural material.
Fatigue crack propagation life evaluation of an autofrettaged thick-walled cylinder
Lee, Song-In ; Kim, Jin-Yong ; Jeong, Se-Hui ; Go, Seung-Gi ;
Transactions of the Korean Society of Mechanical Engineers A, volume 22, issue 2, 1998, Pages 321~329
DOI : 10.22634/KSME-A.19220.127.116.111
To ensure the structural integrity of the autofrettaged thick-walled cylinder subjected to cyclic internal pressure loading, the fatigue crack propagation life of the cylinder was evaluated. Stress intensity factors of the external cracked cylinder due to internal pressure and autofrettage loadings were calculated using the finite element method. The fatigue crack propagation lives of the cylinder based on the fracture mechanics concepts were predicted and compared to the experimental fatigue lives evaluated from the C-shaped simulation specimens. There were good correlations between the predicted and experimental fatigue lives within a factor of 3 for the single and double grooved C-shaped simulation specimens. Predicted fatigue crack propagation lives of the double grooved cylinders were about 1.5-5 times longer than those of the single grooved cylinders depending on the levels of autofrettage.
Effect of rubber mold on densification behavior of metal powder during cold isostatic pressing
Jeong, Jin-Won ; Kim, Gi-Tae ;
Transactions of the Korean Society of Mechanical Engineers A, volume 22, issue 2, 1998, Pages 330~342
DOI : 10.22634/KSME-A.1918.104.22.1680
The effect of rubber mold on densification behavior of pure iron powder was investigated under cold isostatic pressing. The thickness effect of rubber mold was also studied. The elastoplastic constitutive equation based on the yield function of Shima and Oyane was implemented into the finite element program(ABAQUS) to predict compaction responses of metal powder under cold isostatic pressing. The hyperelastic constitutive equation based on Moony-Rivlin and Ogden strain energy potentials was also employed to analyze deformation of rubber mold. The coefficients of the strain energy potentials were obtained from tension and volumetric compression data of rubber. Finite element results were compared with experimental data for densification of pure iron powder under cold isostatic pressing.
A study on the fracture toughness degradation in cryogenic structural material using single-specimen method
Kwon, Il-hyun ;
Transactions of the Korean Society of Mechanical Engineers A, volume 22, issue 2, 1998, Pages 343~351
DOI : 10.22634/KSME-A.1922.214.171.1243
This paper was investigated degradation of the fracture toughness caused by sensitizing heat-treatment of the cryogenic structural material JN1 base metal using unloading compliance method reported as useful a method in evaluating the elastic-plastic fracture toughness at cryogenic temperature. The specimens used in this paper were 20% side-grooved 0.5T-CT specimens which were machined in the JN1 base metal. Also, to investigate cryogenic fracture toughness of the fusion line region in the JN1 GTA weldments, it was also used 20% side-grooved 0.5T-CT specimens that was machined fusion line to located in the middle of the specimen. The cryogenic fracture toughness values of the JN1 base metal were significantly decreased with increasing the time and temperature of the heat treatment. The fracture toughness value obtained from the fusion line specimen was invalid, but it was lower value than that of the JN1 base metal. Especially, this value was approximately equal with that obtained from the JN1 650.deg. C-5h heat-treated material.
Design and evaluation of small size six-axis force/torque sensor using parallel plate sturcture
Joo, Jin-Won ; Na, Gi-Su ; Kim, Gap-Sun ;
Transactions of the Korean Society of Mechanical Engineers A, volume 22, issue 2, 1998, Pages 353~364
DOI : 10.22634/KSME-A.19126.96.36.1993
This paper describes the design processes and evaluation results of a small-sized six-axis force/torque sensor. The new six-axis force/torque sensor including S-type structure has been developed using a parallel plate structure as a basic sensing element. In order tominimize coupling errors, the location of strain gages has been determined based on the finite element analysis and the connections of strain gages have been made such that the bridge circuit with 4 strain gages becomes balanced. Several design modifications result in a similar strain sensitivity for six-axis forces and moments, and the reduced coupling errors of 2.6% FS between each forces and moments. Calibration test results show that the six-axis load cell developed which has light weight of 135g and the maximum capacities of 196 N in forces and 19.6 N.m in moments is estimated to be within 7.1% FS in coupling error.
A new incompatible mixed formulation for incompressible and nearly-incompressible media
Ju, Sang-Baek ; Sin, Hyo-Chol ;
Transactions of the Korean Society of Mechanical Engineers A, volume 22, issue 2, 1998, Pages 365~371
DOI : 10.22634/KSME-A.19188.8.131.525
In the present study, we attempted to add the incompatible functions as additional variable terms to the conventional u-p formulation. It is derived from the four-field generalized variational principle that encompasses velocity, pressure, velocity strains and stress fields as independent interpolated variables. As a severe test of the present formulation, we have investigated the driven cavity with the corner velocity singularity like leaky lid. Through the test, the present element performs very well without unstable oscillation of pressure distribution.
Development of a 6 degrees-of-freedom micro stage for ultra precision positioning
Kim, Kyung-Chan ; Kim, Soo-Hyun ; Kwak, Yoon-Keun ;
Transactions of the Korean Society of Mechanical Engineers A, volume 22, issue 2, 1998, Pages 372~379
DOI : 10.22634/KSME-A.19184.108.40.2062
A new 6 degrees-of-freedom micro stage, based on parallel mechanisms and actuated by using piezoelectric elements, has been developed for the application of micro positioning such as semiconductor manufacturing devices, high precision optical measurement systems, and high accurate machining. The micro stage structure consists of a base platform and an upper platform(stage). The base platform can effectively generates planar motion with yaw motion, while the stage can do vertical motion with roll and pitch motions with respect to the base platform. This separated structure has an advantage of less interference among actuators. The forward and inverse kinematics of the micro stage are discussed. Also, through linearization of kinematic equations about an operating point on the assumption that the configuration of the micro stage remains essentially constant throughout a workspace is performed. To maximize the workspace of the stage relative to fixed frame, an optimal design procedure of geometric parameter is shown. Hardware description and a prototype are presented. The prototype is about 150mm in height and its base platform is approximately 94mm in diameter. The workspace of the prototype is obtained by computer simulation. Kinematic calibration procedure of the micro stage and its results are presented.
The dynamic explicit analysis of auto-body panel stamping process and investigating parameter affects of dynamic analysis
Jung, Dong-Won ;
Transactions of the Korean Society of Mechanical Engineers A, volume 22, issue 2, 1998, Pages 380~390
DOI : 10.22634/KSME-A.19220.127.116.110
In the present work a finite element formulation using dynamic explicit time integration scheme is used for numerical analysis of auto-body panel stamping processes. The lumping scheme is employed for the diagonal mass matrix and linearizing dynamic formulation. A contact scheme is developed by combining the skew boundary condition and direct trial-and-error method. In this work, for economic analysis the faster punch velocity and the mass scaling method are introduced. To investigate the effects of punch velocity and mass scaling, the various values of punch velocity and the various mass scalings are used for numerical analysis. Computations are carried out for analysis of complicated auto-body panel stamping processes such as forming of an oil pan and a fuel tank.
Development of the Simulator for Estimating Intake Noise of Vehicle and Its Improvement (Part I)
Oh, Jae-eung ; Han, kwang-Hee ; Hong, Jeong-Hyuk ;
Transactions of the Korean Society of Mechanical Engineers A, volume 22, issue 2, 1998, Pages 391~398
DOI : 10.22634/KSME-A.1918.104.22.1681
The intake noise, a major source of vehicle noises, has rapidly become a noticeable, and has been studied to reduce the level. Traditionally, the intake system has been developed through the road test and the experiment using a engine dynamo, namely, the trial and error process. This approach require very high cost and long time consuming to develop the system. In this study, the simulator which had a speaker in the cylinder head was presented. It was easy to analyze the acoustic characteristic of the intake system in laboratory environment. This study presented a improvement to reduce the level of the intake noise using the Transfer Matrix Method and NIT/SYSNOISE, FE analysis commercial software. It was to select optimum position of a resonator and verified by the simulator. This simulator can be used early in the design stage of development of the intake system.
Direct synthesis method of dynamic systems in terms of bond graphs
Park, Jeon-Soo ; Kim, Jong-Shik ;
Transactions of the Korean Society of Mechanical Engineers A, volume 22, issue 2, 1998, Pages 399~407
DOI : 10.22634/KSME-A.1922.214.171.1249
This paper deals with a method for finding the physical structure of dynamic systems which shows reasonable response to a given specifiation. The method uses only four basic models of bond graph prototypes which have been originally proposed by the authors as a general model for dynamic systems, and then makes its procedure highly physical in the sense that it can synthesize a dynamic system through the structural transformation directly on bond graph models without any mathematical manipulation. Also, it is shown that this method has further advantages in optimizing parameters for an existing system rather than developing design concepts for a new device, the latter being more suitable using the so-called analytical synthesis method introduced by Park and Redfield. One example serves to trace the outlines of the direct synthesis method proposed in this paper for dynamic systems in terms of bond graph prototypes.
Stress analysis of creep material containing elliptical rigid inclusion by complex pseudo-stress function
Lee, Kang-Yong ; Kim, Jong-Sung ;
Transactions of the Korean Society of Mechanical Engineers A, volume 22, issue 2, 1998, Pages 408~415
DOI : 10.22634/KSME-A.19126.96.36.1998
The analysis model is the power law creep material containing an elliptical rigid inclusion subjected to the arbitrarily directional stress on infinite boudary. The stress analysis is performed using the conformal mapping function and complex pseudo-stress function. The stress distributions near an elliptical rigid inclusion are obtained with various ellipse shapes, strain hardening exponents and directions of applied stress.
Fabrication of unidirectional commingled-yarn-based carbon fiber/polyamide 6 composite plates and their bend fracture performances
Choi, Nak-Sam ;
Transactions of the Korean Society of Mechanical Engineers A, volume 22, issue 2, 1998, Pages 416~427
DOI : 10.22634/KSME-A.19188.8.131.526
Unidirectional commingled-yarn-based carbon fiber(CF)/polyamide(PA) 6 composite was fabricated under molding pressures of 0.4, 0.6 and 1.0 MPa to study its flexural deformation and fracture behavior. Fiber/matrix interfacial bonding area became larger with an increase of molding pressure from 0.4 to 0.6 MPa. For molding pressures .geq. 0.6 MPa, good flexural performance of similar magnitudes was attained. For the fracture test, four kinds of notch direction were adopted : edgewise notches parallel (L) and transverse (T) to the major direction of fiber bundles, and flatwise notches parallel(ZL) and perpendicular(ZT) to this direction. Nominal bend strength for L and ZL specimens exhibited high sensitivity to notching. ZL specimens revealed the lowest values of the critical stress intensity factor
which was slightly superior to those of unfilled PA6 matrix. Enlargement of the compression area for T specimens was analyzed by means of the rigidity reduction resulting from the fracture occurrence.
Development of engine control based TCS slip control algorithm using engine map
Song, Jae-Bok ; Kim, Byeong-Cheol ;
Transactions of the Korean Society of Mechanical Engineers A, volume 22, issue 2, 1998, Pages 428~436
DOI : 10.22634/KSME-A.19184.108.40.2068
A TCS slip control system improves acceleration capability and steerability on slippery roads through engine torgue and/or brake torque control. This research mainly deals with the engine control algorithm via the adjustment of the engine throttle angle. The following new control strategy is proposed and investigated ; the TCS slip controller whose input is the difference between the desired driving wheel speed corresponding to the optimum slip ratio and the actual speed yields the target engine torque and then estimates the throttle angle based on the engine performance curve. Various simulation and hardware-in-the-loop simulation have been carried out. The results show the proposed strategy may compensate for the inherent nonlinearity between variation of the throttle angle and variation of the engine torque and produce better performance than the previous strategies without the engine map, especially in the high speed region.
Torsional free vibration analysis of heavy duty powertrain
Ahn, Byoung-Min ; Hong, Dong-Pyo ;
Transactions of the Korean Society of Mechanical Engineers A, volume 22, issue 2, 1998, Pages 437~443
DOI : 10.22634/KSME-A.19220.127.116.117
Automobile company tries to reduce the inertia of powertrain to increase the fuel efficiency and increase the engine power every year to make the high speed driving possible at full load condition. These cause the torsional vibration of powertrain. But the demand about ride comfort improvement is increased constantly, so torsional vibration of powertrain become an emergency problem to be cured. This study is a basic research to reduce the torsional vibration of powertrain at driving condition. First, the heavy duty powertrain is characterized as a vibrating system. Its natural frequencies and mode shapes are reviewed. Second, by comparison of simulation results and experiment results, validity of developed model is verified. Finally, the couterplan which can reduce the torsional vibration by mode analysis and parameter modification is suggested.
Derivation of constitutive equations of loose metal powder to predict plastic deformation in compaction
Kim, Jin-Young ; Park, Jong-jin ;
Transactions of the Korean Society of Mechanical Engineers A, volume 22, issue 2, 1998, Pages 444~450
DOI : 10.22634/KSME-A.1918.104.22.1684
In the present investigation, it is attempted to derive a yield function and associated flow rules of loose metal powders to predict plastic deformation and density change during compaction. The loose metal powders yield by shear stress as well as hydrostatic stress and the yield strength is much smaller in tension than compression. Therefore, a yield function for the powders is expressed as a shifted ellipse toward the negative direction in the hydrostatic stress axis in the space defined by the two stresses. Each of parameters A, B and .delta. used in the yield function is expressed as a function of relative density and it is determined by uniaxial strain and hydrostatic compressions using Cu powder. Flow rules obtained by imposing the normality rule to the yield function are applied to the analyses of unidirectional, bidirectional and hydrostatic compressions, resulting in an excellent agreement with experiments. The yield function is further examined by checking volume changes in plane stain, uniaxial strain and shear deformations.
Ammonia flow control for NOx reduction in SCR system of refuse incineration plant
Kim, In-Gyu ; Yeo, Tae-Gyeong ; Kim, Hwan-Seong ; Kim, Sang-Bong ;
Transactions of the Korean Society of Mechanical Engineers A, volume 22, issue 2, 1998, Pages 451~457
DOI : 10.22634/KSME-A.1922.214.171.1241
This paper describes a modelling method for SCR(selective catalystic reduction) system in refuse incineration plant. We consider the SCR system as a single input and single output system. For modelling the SCR system, an auto regressive exogeneous(ARX) modelling method is used. In this case, we should design the white noise input for modelling and put it on the system as an input
, and take an outlet NOx as an output. From these two relations, we design the ARX model with 45 second delay time and transform to a discrete system with sampling time of 0.5 second. Using the obtained SCR model, we verify that the outlet NOx is deeply related with stoker`s moving in boiler of refuse incineration plant.
Experimental identification of nonlinear model parameter by frequency domain method
Kim, Won-Jin ;
Transactions of the Korean Society of Mechanical Engineers A, volume 22, issue 2, 1998, Pages 458~466
DOI : 10.22634/KSME-A.19126.96.36.1998
In this work, a frequency domain method is tested numerically and experimentally to improve nonlinear model parameters using the frequency response function at the nonlinear element connected point of structure. This method extends the force-state mapping technique, which fits the nonlinear element forces with time domain response data, into frequency domain manipulations. The force-state mapping method in the time domain has limitations when applying to complex real structures because it needd a time domain lumped parameter model. On the other hand, the frequency domain method is relatively easily applicable to a complex real structure having nonlinear elements since it uses the frequency response function of each substurcture. Since this mehtod is performed in frequency domain, the number of equations required to identify the unknown parameters can be easily increased as many as it needed, just by not only varying excitation amplitude bot also selecting excitation frequency domain method has some advantages over the classical force-state mapping technique in the number of data points needed in curve fit and the sensitivity to response noise.
A study on the design and characteristics of kinematics of 6 degree-of-freedom manipulators
Kim, Jeoung-Tae ; Kim, Moon-saeng ;
Transactions of the Korean Society of Mechanical Engineers A, volume 22, issue 2, 1998, Pages 467~475
DOI : 10.22634/KSME-A.19188.8.131.527
The Six Degree-of-Freedom manipulators are generally operated by linear actuators which are hydraulic cylinder, pneumatic cylinder, ball-screw. But these actuators are not adequate to have a wide work-space, and furthermore some of them have a self-locking property. Therfore, we have designed a new manipulator which fully overcomes these demerits. The new manipulating system consists of 6 DC-motors to generate operation forces and 6 position transducers to feedback displacement signals. This paper presents an overview of the design and characteristics of 6 Degree-of-Freedom force feedback manipulators for vitual reality implementation. we can operate Six Degree-of-Freedom manipulator with six motors and six potentiometers.
A study on the behaviour of cutting heat at high speed cutting work
Joo, Ho-Youn ; Lee, Yung-Sung ;
Transactions of the Korean Society of Mechanical Engineers A, volume 22, issue 2, 1998, Pages 476~481
DOI : 10.22634/KSME-A.19184.108.40.2066
It is generally known that in high speed work with more than 1000 m/min cutting speed, according to the work material phenomenon of tool wearing is increased due to the some produced neat and as a result this makes the cutting work impossible. In this study, the high speed cutting is possible because of the different cutting from the presently known fact. That is, most of generated heats influence on the quantity flowing in chip greatly. Therfore, this study aims at the behavior of cutting heat generated at high speed cutting. It makes clearly the euqntity of heat flowing in chip, work materal, tool, and inflowing ratio. The cutting mechanism varies by the changing of cutting depth, slant face and contact area through this study. And it is exammined that the influence of heat of all parts is greatly due to the change the contact length of clearance face. It is confirmed from the exp[eriment that the inflowing heat ratio influences the cutting speed greatly and the heat of clearance face can not be disregarded.