航空精密铸件射线CR成像检测研究.pdfVIP

学兔兔 铸 造 Sep．2011 · 884· FOUNDRY VoI．60 NO．9 航空精密铸件射线CR成像检测研究 敖 波，邬冠华，邓翠贞，高鸿波 (南昌航空大学无损检测技术教育部重点实验室，江西南昌330063) 摘要：根据ASTME192验收标准，对某精铸件加工的孔型和槽型缺陷，分别采用cR和c7胶片进行射线检测对比。由 于cR图像灰度范围宽，细节影像不易直接观察，采用多尺度对比度增强算法提取细节信息进行增强放大，人眼可直接 从增强后的图像识别细节信息。cR与C7胶片检测对比试验结果表明，cR图像的质量已达到C7胶片的检测质量，可降 低检测成本和提高检测效率，能代替c7胶片实现该精铸件的数字射线照相检测。 关键词：铸件；成像板；射线CR；多尺度对比度增强 中图分类号：TG1 15．28；TG247 文献标识码：A 文章编号：1001—4977(201 1)09—0884—04 Com puted Radiography I nspection of Aero Precision Casting AO Bo，WU Guan—hua，DENG Cui—zhen，GAO Hong—bo (Key Laboratory of Nondestructive Testing(Ministry of Education)，Nanchang Hangkong University，Nanchang 330063，Jiangxi，China) Abstract：To check the detectability of computed radiography(CR)technology for defects of cavity，porosity and crack，the hole and groove were machined in the castings and inspected bV CR and conventionaI f¨m radiography(RT)with C7 fiIm based on the standard of ASMT E1 92，and the results were compared．In CR images．details are difficult to observe due to their wide range of grey levels。therefore the multi-scale contrast enhancement algorithm for CR jmages was employed to enhance the subtle details；these enhanced images are discernible for human eyes．The results of comparative experiment between CR and conventionaI RT with C7 fjIm show that the image quality 0f CR is as same as that of C7 fiJm．Using the CR inspection method can decrease the inspection cost and improve the inspection productivity considerably．thereby CR can replace the conventionaI