CAJ | 학술논문

当今空调铜管的发展趋势表现为小口径、薄壁,小弯头管在弯制过程中易出现管口扁平、外侧管壁开裂和内侧起皱等缺陷.采用DEFORM有限元软件分析了铜管弯制过程中缺陷产生原因,并对芯杆位置和尺寸进行了优化.研究结果表明:当弯曲角度为180°时,铜管易产生外侧裂纹,并由外侧向内侧扩展;在弯曲角度为0~90°范围内铜管内侧易出现起皱现象;Φ7×0.41mm铜管弯曲时较优的芯杆直径为5.80mm,提前量为2mm.根据以上参数,对铜管进行了弯曲试验,并没有出现外裂、内皱和扁平等缺陷,获得了优良的小弯头管.
당금공조동관적발전추세표현위소구경、박벽,소만두관재만제과정중역출현관구편평、외측관벽개렬화내측기추등결함.채용DEFORM유한원연건분석료동관만제과정중결함산생원인,병대심간위치화척촌진행료우화.연구결과표명:당만곡각도위180°시,동관역산생외측렬문,병유외측향내측확전;재만곡각도위0~90°범위내동관내측역출현기추현상;Φ7×0.41mm동관만곡시교우적심간직경위5.80mm,제전량위2mm.근거이상삼수,대동관진행료만곡시험,병몰유출현외렬、내추화편평등결함,획득료우량적소만두관.
Small diameter and thin wall tube is a trend of development for air-conditioner pipe now, the outside crack, inside wrinkle and orifice flat easily appear during a small elbow pipes preparation. The causing reason of copper tube defects was analyzed and the position and size of core was optimized. These results show that the cracks easily occur at outside and expand towards inner when the bend angle is 180°, the wrinkles appear at the inner of tube during the angle of 0~90°. The optimal parameter is 5.80 mm core diameter and 2 mm ahead for Φ7×0.41mm copper tube. According to these parameters during bending tube experiments, the defects of outside crack, inside wrinkle and flatness were basically eliminated and the excellent tubes were obtained.