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CR在发动机变壁厚产品检测中的试验研究
刘贞, 任文坚, 彭东剑, 刘国增, 王永红
西安航天发动机有限公司
摘要:
针对液体火箭发动机离心轮、涡轮静子等厚度变化大的复杂激光选区熔化成形(SLM)钢构件在常规X射线胶片照相检测(RT)时,由于胶片的宽容度低造成的检测覆盖率低,存在漏检质量隐患的问题,采用射线计算机成像技术(CR)对该类变截面厚度差在5~20 mm内的钢构件进行检测。结果表明,CR检测图像宽容度是胶片照相检测的3倍,检测覆盖率高;以离心轮线状缺陷CR检测为例,且通过CT和理化检测验证证明,CR检测具有与胶片照相检测基本一致的缺陷检测灵敏度、可靠性。
关键词:  射线计算机成像技术,火箭发动机,激光选区熔化成形钢构件,大厚度差,图像宽容度
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基金项目:军工基础性科研院所稳定支持项目(2019KGW.YY4007Tm)
CR Technology in Detection of Engine Variable Wall Thickness Products
liuzhen, REN Wenjian, PENG Dongjian, LIU Guozeng, WANG Yonghong
Xi’an Aerospace Engine Corporation
Abstract:
When the laser selective melting forming (SLM) steel products with large thickness variation in airspace engine,such as centrifugal wheel and turbine stator,are detected by conventional X-ray film photographic inspection (RT),quality problem of missed detection may exist,since low tolerance of industrial X-ray films give rise to low testing coverage rate. In order to solve the problem,computed radiography testing (CR) was used to detect steel products defects,of which the thickness difference ranges from 5 mm to 20 mm. By comparing the CR image and the RT image,test results show that the tolerance of CR image is 3 times that of RT image. Taking linear defects of CR testing in centrifugal wheel as an example,through CT testing and physico-chemical testing,it is proved that defect detection sensitivity of CR is essentially the same as that of RT.
Key words:  CR,Rocket engine,SLM steel products,Large thickness variation, Tolerance of image