AC7A를 이용한 사형주조에서 타이어 몰드의 열변형에 관한 유한요소 해석

오율권(Yoolkwon Oh),김용범(Yongbum Kim),양호동(Hodong Yang),박근욱(Keonuk Park),서동표(Dongpyo Seo) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11

The present study analyzed on thermal strain of the AC7A tire mold produced in sand castings by FEA. To predict the numerical result of thermal strain in AC7A mold during the cooling process, it is performed the investigation of temperature distribution, stress and strain based on the physical properties of AC7A. In results of this study, the temperature distribution result of AC7A mold is more uniform than mild steel mold and the cooling time of AC7A mold is more short than it. Also, the results of strain and stress in AC7A mold is better than it. In addition, AC7A and mild steel mold is revealed that cooling curve was observed the rapid pattern in 20 minutes after beginning cooling process and difference in temperature of mold is the biggest. These results are presented to help to make the effective and the precision tire mold. Also, the introduced technique of numerical analysis is very useful and especially needs to improve the high precision mold in the industrial aspect.

압전 엑츄에이터를 이용한 열전냉각장치의 냉각효율에 관한 실험적 연구

오율권(Yoolkwon Oh),최제세(Jese Choi),윤희성(Heesung Yoon) 한국자동차공학회 2008 한국자동차공학회 지부 학술대회 논문집 Vol.2008 No.11

This study was experimentally investigated on cooling effect of cold region to thermoelectric cooling device using thermoelectric module when piezoelectric actuator was used. In this study, a prototype of a miniature thermoelectric cooling device using thermoelectric module and piezoelectric actuator were proposed and constructed. The temperature of cold region was measured to investigate cooling effect of cold region to thermoelectric cooling device when piezoelectric actuator wasn't operated and was operated. Also, the flow visualization of cold region using He-Ne laser and CCD camera was experimentally investigated. The experimental set-up for temperature measurement and the flow visualization consisted of thermoelectric cooling device using thermoelectric module, piezoelectric actuator, T-type thermocouple, data acquisition unit, He-Ne laser, CCD camera, image grabber and PC. When piezoelectric actuator was operated, acoustic streaming was occurred by vibration of piezoelectric actuator, and it was improved cooling effect.

알루미늄 합금 캐스팅 타이어 몰드의 열변형 해석에 관한 연구

오율권(Yoolkwon Oh),김영선(Youngsun Kim) 한국자동차공학회 2007 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-

In general, as the casting process is made progress at high temperature, thermal deformation of the mold directly affects the dimension of the casting products. For this reason, numbers of researches have been made with regard to the thermal deformation of the molds. Also, it gives many influence at size precision. So, while the mold product for the automobile tire was manufactured, the numerical analysis was performed based on the finite element method(FEM) in order to estimate the cooling pattern of the aluminum alloy material including temperature, displacement and stress. Also, for the numerical analysis, "COMSOL Multiphysics™", a commercial program for heat transfer analysis and thermal-structural analysis, was used. And, in order to verify the result calculated by the numerical analysis, the experiment was carried out using the metal casting device actually used for manufacturing the tire mold. The experimental setup consisted of metal casting device, data acquisition unit(DAQ 100), K-type thermocouple and PC. When the temperature distribution actually measured by the experiment was compared with the one calculated by the numerical analysis method, there was a slight temperature difference between the two results because of the latent heat of the aluminum alloy but their cooling patterns were almost similar.

알루미늄 합금을 사용한 타이어 몰드의 열변형에 관한 수치해석적ㆍ실험적 연구

오율권(Yoolkwon Oh),김용범(Yongbum Kim),양호동(Hodong Yang) 한국자동차공학회 2007 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-

Numerical analysis using a finite element method was applied to analyze that aluminum alloy mold was happened the difference of temperature distribution. Beside, thermal strain rate occurred by temperature distribution investigated to predict the accurate measurement variations of aluminum alloy. In results of this study, aluminum alloy represented rapidly cooling graph during initial 20 minutes after beginning cooling process, therefore value of stress and displacement is rapidly changed during initial 20 minutes after beginning cooling process. In addition to, temperature distribution obtained by experiment confirmed corresponding pattern then compared numerical analysis with experiment. These results are contributed to make the effective and the high precision casting mold.

AC7A 알루미늄 합금 금형의 응고과정에서 금형 내부에 발생하는 열변형에 대한 수치해석적 연구

오율권(Yoolkwon Oh),김용범(Yongbum Kim),양호동(Hodong Yang) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

The manufacturing industry such as automobile tire must be changed to consult the tastes of customers and is required to make the finest product that it has improved more stability and driving performance at consumer's desire in a quick time. In the present study, AC7A aluminum alloy casting mold which consist of 8 pieces is introduced as an analysis model. Also, numerical work using a finite element method was applied to investigate the thermal deformation that included the temperature distribution, stress and strain during the cooling process in AC7A aluminum alloy casting mold. The numerical results such as temperature distributions, stress and strain are presented to help to make the effective and the best tire mold. In addition, the introduced technique of numerical work using a finite element method is very useful and especially needs to improve the precision of tire mold such as sectional type or puzzle type.

FEM을 이용한 Tire Mold용 Al 금형의 온도분포 및 수축량 해석

오율권(Yoolkwon Oh),김재열(Jaeyeol Kim),서동표(Dongpyo Seo),양호동(Hodong Yang),박근욱(Keunuk Park),김우진(Woojin Kim) 한국자동차공학회 2005 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-

The plant of Al alloy mold should be established to produce the good quality tires. However, mild steel mold is used as tire mold which is consist of one piece. This type of metal mold is more economic in the total cost but the quality of product is not enough. Therfore, in this study, Al alloy mold which consist of six pieces was introduced. Also, numerical analysis using a finite element method (FEM) was applied to analyze that Al alloy mold was happened the characteristics of temperature distribution. Moreover, the contraction rate occurred by temperature distribution investigated to predict the accurate measurement variations of Al alloy mold.

열전현상을 이용한 열전냉각장치의 냉각특성에 관한 연구

윤희성(Heesung Yoon),오율권(Yoolkwon Oh) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4

This study investigated on cooling characteristics in cooling region when the acoustic streaming was generated. In this study, piezoelectric actuator was used for generating acoustic streaming in cooling region of thermoelectric cooling device. When the acoustic streaming was generated by the piezoelectric actuator, temperature distribution was measured using thermocouples for investigating cooling characteristics in the cooling region of thermoelectric cooling device. Also, He-Ne laser and CCD camera were used for thermo-flow visualization in the cooling region. The experimental set-up for temperature measurement and the thermo-flow visualization in the cooling region consisted of thermoelectric module, piezoelectric actuator, thermocouples, data acquisition units, He-Ne laser, CCD camera, image grabber and PC. As a result, it was certified that the piezoelectric actuator generated the acoustic streaming, and the cooling effect in the cooling region was improved when the acoustic streaming was generated.

타이어 몰드 제작용 AC4C와 AC7A 주조재의 냉각특성 비교

최제세(Jese Choi),오율권(Yoolkwon Oh) 한국자동차공학회 2009 한국자동차공학회 지부 학술대회 논문집 Vol.2009 No.10

This study investigated on cooling characteristics of AC4C aluminum alloy casting material and AC7A aluminum alloy casting material using gravity casting method for manufacturing automobile tire mold by experiment and numerical analysis. The temperature distribution and the cooling time of the materials were measured by experiment, and the results from the experiment were compared each other for the investigation of their cooling characteristic. The displacement and the stress distribution of the materials were calculated by numerical analysis, and the results from the analysis were compared each other, and also the results of the experiment and the numerical analysis were compared each other. The experimental set up for measuring temperature and cooling time consisted of the casting, the metal mold device, data acquisition unit, nine K-type thermocouples and PC. For the numerical analysis, “COMSOL Multiphysics 3.3 Ver”, the commercial code based on the finite element method, was used for the prediction of displacement and stress distribution. As results of experiment, the cooling time of AC7A casting material was faster than cooling time of AC4C casting material about 20 minutes. Also, when casting was separated from permanent mold device, AC7A casting material was faster than AC4C casting material about 10 minutes by separating time. When the results from the numerical analysis were compared each other, the displacement of AC7A casting material was higher than the displacement of AC4C casting material about 1.7㎜, and the stress of AC7A casting material was higher than the stress of AC4C casting material about 0.1㎬.

자동차 타이어 제작용 금형 주조재의 냉각특성에 관한 연구

최제세(Jese Choi),오율권(Yoolkwon Oh) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4

This study investigated on cooling characteristics of AC4C aluminum alloy casting material and AC7A aluminum alloy casting material using gravity casting method for manufacturing automobile tire mold by experiment. The temperature distribution and the cooling time of the AC4C casting material and the AC7A casting material were measured by experiment, and the results from the experiment were compared each other for the investigation of their characteristic. The cooling time of AC7A casting material was faster than cooling time of AC4C casting material about 20 minutes. Also, when casting was separated from permanent mold device, AC7A casting material was faster than AC4C casting material about 10 minutes by separating time. Therefore, when the separating time of casting materials were compared each other, the productivity is going to improve due to the decrease of producing time and increase of production.

3D 수치해석을 이용한 타이어 몰드용 AC7A 주조재의 열변형 분석

김용범(Yongbum Kim),오율권(Yoolkwon Oh) 한국트라이볼로지학회 2007 한국트라이볼로지학회 학술대회 Vol.2007 No.6

The present study numerically investigated on the thermal deformation of AC7 A casting material for tire mold using a finite element method (FEM). 3D analysis model. An analysis model was selected that tire mold is actually produced in a manufacturing factory and its manufacturing system was applied the method of metal casting. Also, AC7A casting material, which one of Al-Mg system alloy, was selected as a casting material of tire mold. The numerical study was performed that the temperature, displacement and stress distribution occurred inside of tire mold was calculated by commercial code "COMSOL Multiphysics" applying the FEM. The numerical results reveal that temperature distributions inside of tire mold occurred a rapid cooling from the beginning the injection of casting material to 20 minutes. Also, the results of displacement and stress distribution were predicted at the measurement points of tread part 감om the temperature results. In the end, introduced technique of numerical method in this study will be easily predicted the thermal deformation of casting material and will be utilized as an important data in the industries associated with mold manufacturing.