CAJ | 학술논문

利用激光测距仪对铸造用超声系统辐射杆进行振动测试，基于比值校正法对所测振动序列进行幅值谱校正后得到辐射杆端面与柱面的位移幅值分布。测试结果表明该超声系统振动以纵向振动为主，同时存在较强的纵横耦合振动。通过超声系统辐射杆空化腐蚀试验，发现辐射杆端面腐蚀均匀分布，柱面腐蚀则出现在振幅大于2．2μm的区域。结合柱面振幅分布与空化腐蚀区域推算出700°C时7050铝合金熔体的空化阈值约为1．1 MPa。
이용격광측거의대주조용초성계통복사간진행진동측시，기우비치교정법대소측진동서렬진행폭치보교정후득도복사간단면여주면적위이폭치분포。측시결과표명해초성계통진동이종향진동위주，동시존재교강적종횡우합진동。통과초성계통복사간공화부식시험，발현복사간단면부식균균분포，주면부식칙출현재진폭대우2．2μm적구역。결합주면진폭분포여공화부식구역추산출700°C시7050려합금용체적공화역치약위1．1 MPa。
Vibration test was done for a piezoelectric ultrasonic transducer used in casting by virtue of laser range finder.The displacement amplitude distribution of the end and cylindrical surface was gained through the amplitude spectrum correction of the vibration series based on interpolation method.The test results show that longitudinal vibration is the major vibration and there exists crossbar coupling in ultrasound system vibration.The results of the cavitation corrosion experiment of the radiator indicate that the corrosion on end surface is uniform but on cylindrical surface it occurs on the area where the amplitude is over 2.2μm.The calculation indicates that the cavitation threshold in aluminum alloy 7050 at temperature 700℃ is 1 .1 Mpa.