• Title/Summary/Keyword: Tool temperature

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Study on the tool temperature estimation for different cutting conditions in turning using a statistical method (통계적 기법을 이용한 선삭 가공 절삭조건에 따른 공구온도 예측)

  • 김성청;이응석;문홍현;송길용
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1997.10a
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    • pp.851-856
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    • 1997
  • This study is on the estimation of the tool temperature for different tool nose radius and cutting conditions in turning. The experiment has been performed in different cutting conditions such as cutting speed, feed rate, and depth of cut for the tool nose radius, 0.4R, 0.8R using SMC workpiece materials. Tool temperature is measured using thermo-couple which is embedded in the insert tip. Using a multiple linear regression method, the tool temperature can be determined as an exponential equation with cutting variables and tool nose diameters for different tool materials. The equations determined in this study show a good correlation for the cutting conditions and can be used for the tool temperature estimation. The result indicates that the tool temperature decreases for ~ncreasing the tool nose radius in general. Also, nose radius hardly influences on the tool temperature compared with cutting speed, feed rate and depth of cut.

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A Study on the Tool Temperature Estimation for Different Cutting Conditions in Turning Using a Statistical Method (통계적 기법을 이용한 선삭가공 절삭조건에 따른 공구온도 예측)

  • 송길용;문홍현;박병규;김성청;이응석
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.11
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    • pp.96-102
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    • 2002
  • This study is on the estimation method of toot temperature for different tool nose radius and cutting conditions in turning. Experimental analysis has been performed in different cutting conditions such as cutting speed, feed rate, and depth of cut for the tool nose radius, 0.4R, 0.8R using SMC workpiece materials. Tool temperature is measured using a thermo-couple which is embedded in the insert tip. Using multiple linear regression method, the tool temperature can be determined as an exponential equation with cutting variables and tool nose diameters for the different tool materials. The equations determined in this study show a good correlation for the cutting conditions and can be used for a tool temperature estimation technique. The result indicates that the tool temperature decreases for increasing the tool nose radius in general. Also, nose radius hardly influences on the tool temperature compared with cutting speed, feed rate and depth of cut. This method will be useful for the estimation of tool life and temperature using limited experimental data for given cutting conditions.

On Cutting Characteristics Change of Low Temperature Cooling Tool -Cutting Characteristics of Cage Motor Rotor- (저온냉각공구의 절삭특성 변화 -모타 회전자의절삭특성-)

  • 김순채
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 1995.10a
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    • pp.37-43
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    • 1995
  • The cutting process of cage motor rotor require high precision and good roughness, the surface roughness fo cutting face is very important factor with effect on the magnetic flux density of cage motor rotor. The paper describes a cause of decrease in the cutting force and roughness on low temperature cooling tool by means of analysis on the mechanism of force system at cutting condition and experimental findings. The main results as compared with the room temperature cutting are as follow : 1) The cutting resistance decreased due to low temperature cooling tool. 2) The surface roughness decreased due to low temperature cooling tool. 3) The low temperature cooling tool effected machinability of the cutting direction in machined surface. 4) The low temperature cooling decreased burr of corner in feed direction.

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An Experimental Study of the Temperature Characteristics of a Cutting Tool in Machining of Stainless Steel (스테인레스강 절삭가공에서 공구의 온도 특성에 대한 실험적 연구)

  • 권용기
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.5 no.1
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    • pp.9-16
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    • 1996
  • This is an experimental investigation of the temperature generated in a cutting tool during the machining of stainless steel. The temperature results from the wear of the cutting tool are considered in order to investigate the relation between cause and effect of these factors. This possibility has been tested using a thermocouple technique to record temperature vs. time curves for a variety of cutting conditions. This is done by employing a thermocouple inserted on the tool tip near the major cutting edge. Temperature distributions are calculated using finite element method and compared to the contour maps measured by an optical system. It suggests that the temperature gradients and the tool performance will be dependent on certain facotrs in tool geometry when cutting this material.

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A Study on Practical Engineering Model for Tool Temperature Control (금형온도제어에 대한 실천공학모형 연구)

  • Shin, Ju-Kyung
    • Journal of Practical Engineering Education
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    • v.10 no.2
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    • pp.89-94
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    • 2018
  • In injection molding, the tool temperature has a great influence on the quality of the molded article. The appropriate temperature is determined by the molding material and the quality required for the molded part, and the important point is that the temperature should be stable. First, the tool temperature should be set in accordance with the quality required by the molded article within the range of the tool temperature conditions suitable for the material. That is, the tool temperature changes depending on the importance of the surface gloss of the molded article, shortening of the molding cycle, prevention of deformation, degree of shrinkage, ease of resin flow and the like. In order to improve practical tool technology, we propose a training model of the difficult process of tool temperature control which can be utilized in industry that design and manufacture injection mold.

Turning of Hardened Materials Using the Air-oil Cooling System (에어-오일 냉각방식에 의한 고경도재료의 선삭)

  • Chung, Bo Gu;Ko, Tae Jo;Kim, Hee Sool
    • Journal of the Korean Society for Precision Engineering
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    • v.14 no.8
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    • pp.73-81
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    • 1997
  • The hard turning process defined as a single point turning of materials harder than $H_{R}$C 58 differs from conventional turning because of hardness of the work materials and cutting toos needed in the process. In hard turning, tool life is very short, of the order of a few minutes, during which the cutting tool is subjected to the extremes of stress and temperature. In this regard, it is well known that CBN tool is proper for this process in spite of expensive cost. In this research, we studied the feasibility of the use of the low cost cutting tool such as a aTiN coated tool. To this end, a new cooling system was designed with an air-oil method for reducing tool temperature, which is based on the principle of air vortex flow. That is, the outlet temperature of the air becomes aver 20 .deg. C lower than atmosphere temperature by entering pressurized air of 5kgf/c $m^{2}$ into the inlet. This cooled air ejected to the top of the cutting tool lowered tool temperature, which reduced the wear of a TiN coated tool by the 30% of CBN tool life with respect to the same cutting length.h.

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Prediction of Cutting Temperature at High Speed Steel in Orthogonal Turning based on Finite Element Method (2차원 선삭시 유한요소법에 의한 고속도강공구의 절삭온도 예측)

  • Jun, Tae-Ok;Bae, Choon-Eek
    • Journal of the Korean Society for Precision Engineering
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    • v.12 no.10
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    • pp.102-112
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    • 1995
  • Temperature distribution on the rake face and flank face in orthogonal turning with cutting tool of high speed steel is studied by using a finite element method and experiments. Experiments are carried out to verify the validity of the temperature measurement by using a thermoelectric couple junction imbedded in a cutting tool of high speed steel. Good agreement is obtained between the analytical results and the experimental ones for the temperature distributions on both the rake face and flank face of cutting tool with high speed steel. The analytical results show that the temperature on the top flank face of a tool is higher than it on the top rake face of the tool because of the difference of the friction velocity on each face of the tool.

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Heat transfer coefficients for F.E analysis in warm forging processes (온간 단조 공정에서의 열전달 계수)

  • Kang J. H.;Ko B. H.;Jae J. S.;Kang S. S.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2005.05a
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    • pp.138-143
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    • 2005
  • Finite Element analysis is widely applied to elevated temperature forging processes and shows a lot of information of plastic deformation such as strain, stress, defects, damages and temperature distributions. In highly elevated temperature deformation processes, temperature of material and tool have significant influence on tool life, deformation conditions and productivities. To predict temperature related properties accurately, adequate coefficients of not only contact heat transfer between material and dies but also convection heat transfer due to coolants are required. In most F.E analysis, too higher value of contact heat transfer coefficient is usually applied to get acceptable temperature distribution of tool. For contact heat transfer coefficients between die and workpiece, accurate values were evaluated with different pressure and lubricants conditions. But convection heat transfer coefficients have not been investigated for forging lubricants. In this research, convection heat transfer coefficients for cooling by emulsion lubricants are suggested by experiment and Inverse method. To verify acquired convection and contact heat transfer coefficients, tool temperature was measured for the comparison between measured tool temperature and analysis results. To increase analysis accuracy, repeated analysis scheme was applied till temperature of the tool got to be in the steady-state conditions. Verification of heat transfer coefficients both contact and convection heat transfer coefficients was proven with good accordance between measurement and analysis.

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Characteristics of tool wear and cutting temperature in machining of SUS 304 (SUS 304 절삭시 공구마모와 절삭온도의 특성)

  • Kwon, Y.K.
    • Journal of the Korean Society for Precision Engineering
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    • v.11 no.1
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    • pp.71-79
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    • 1994
  • The aim of this study is to analyze the behavier of SUS 304 during the cutting process and the resulting cutting temperaturce. Since SUS 304 is a difficult-to-machine material, tool damage is largely affected by the suitability of cutting conditions. Therefore, in varying such cutting conditions, the experiment investigates the relations between cutting temperature and tool wear during the cutting process. All the cutting temperature data were manipulated successfully, and the tool temperature distributions were analyzed by a finite element method based on the acquisition data. In the results, the characteristics of cutting temperature are related to the difficulty of machining characteristics.

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Prediction of Cutting Temperature in Flank Face at High Speed Steel in Orthogonal Turning (2차원 선삭시 고속도강 공구의 플랭크면 절삭온도 예측)

  • Jun, Tae-Ok;Bae, Choon--Eak
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.20 no.1
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    • pp.222-231
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    • 1996
  • Temperature distribution on the flank face in orthogonal turning with cutting tool of high speed steel is studied by using a finite element method and experiments. Experiments are carried out to verify the validity of the temperature measurement by using a thermoelectric couple junciton imbedded in a cutting tool of high speed steel. Good agreement is obtained between the analytical results and the experimental ones for the temperature distributions on flank face of cutting tool with igh speed steel. The analytical results show that the temperature on the top flank face of a tool is higher because of the difference of the friction velocity on each face of the tool.