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作 者:郭峰 孙文磊[1] 王恪典 张冠[1] GUO Feng;SUN Wenlei;WANG Kedian;ZHANG Guan(School of Mechanical Engineering,Xinjiang University,Urumqi 830047,China)
机构地区:[1]新疆大学机械工程学院,新疆乌鲁木齐830047
出 处:《热加工工艺》2020年第22期92-97,共6页Hot Working Technology
基 金:新疆维吾尔自治区高技术研究发展项目(201513102);新疆克拉玛依市科技重大专项项目(2018ZD002B);新疆维吾尔自治区青年自然科学基金项目(2017D01C062)。
摘 要:激光熔覆后零件的表面会产生气孔而影响零件的表面质量。通过检测得到的气孔深度可为零件表面质量评价提供依据。采用红外无损检测技术,通过气孔温度变化,定量检测气孔的深度。建立模型对实验得到的红外热序图进行处理,利用小波变换进行图像去噪、简化的PCNN图像分割和目标信息提取得到气孔的温度信息,结合PSDT法从而得到激光熔覆后试件表面气孔的深度。结果表明:红外无损检测出气孔A、B(两个不同的气孔)的值分别为1.053、1.094 mm,而用数字式孔深测量仪测出气孔A、B的实际值分别为0.994、1.021 mm,两者的相对误差不超过10%。激光熔覆后试件的浅表面气孔深度可通过红外无损检测、图像处理和PSDT法的结合进行检测。After laser cladding,the surface of the parts produces air holes,which can affect the surface quality of the parts.By testing the hole depth,it can provide basis for the surface quality evaluation of the part.The infrared non-destructive testing technology was used to quantitatively detect the depth of the pores by combining the pore temperature change.By seting up model,the processing of infrared heat sequence image obtained from experiments were treated.The temperature information of the pores was obtained by wavelet transform image denoising,simplified PCNN image segmentation and target information extraction.The depth of the pores on the surface of the test piece after laser cladding was obtained by PSDT method.The results show that the values of the air holes A and B using infrared non-destructive testing is 1.053 mm and 1.094 mm respectively.The actual values of the pores A and B measured by the digital hole depth measuring instrument is 0.994 mm and 1.021 mm respectively.And the relative errors of the two depths are not more than 10%.The shallow surface pore depth of the test piece after laser cladding can be detected by a combination of infrared non-destructive testing,image processing and PSDT method.
关 键 词:激光熔覆 红外无损检测 气孔检测 小波变换 PCNN图像分割
分 类 号:TG115.28[金属学及工艺—物理冶金] TG174.44[金属学及工艺—金属学]
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