Charpy impact specimen notch inspector and use method thereof

A use method of a Charpy impact specimen notch inspector, comprising the following steps:

• S1:
• positioning a to-be-inspected Charpy impact specimen horizontally on a top of a specimen placement table (5);
• S2:
• powering on a host (3) through a switch button (302), tapping a capturing function on a touchscreen (301), and activating an autofocus high-definition camera (4) through a programmable logic controller (PLC) unit to compare a notch picture of the Charpy impact specimen on the top of the specimen placement table (5);
• S3:
• storing the notch picture of the Charpy impact specimen captured in the step S2 to an image storage module, and performing, by an image data preprocessing module, data preprocessing of noise reduction and filtering on a picture stored in the image storage module, and further performing brightness adjustment and contrast enhancement, thereby improving an image resolution;
• S4:
• recognizing, by an image recognizing and computing module, a picture processed in the step S3, and computing an offset for the notch of the Charpy impact specimen in the picture through an offset computing formula, to determine an offset condition of the Charpy impact specimen;
• and if the Charpy impact specimen is offset, controlling a cross-shaped electric sliding rail (6) and a brake motor (7) through the PLC unit according to the computed offset to drive the specimen placement table (5) for front-back and left-right movement and 360° rotation, such that the specimen placement table (5) drives the Charpy impact specimen on the top of the specimen placement table (5) to move to a preset standard coordinate position;
• S5:
• after the Charpy impact specimen is aligned, selecting a to-be-compared standard model in an image processing module through the touchscreen (301), wherein the standard model is any one of a Guobiao (GB, Chinese national standard)-compliant V&U-notch standard template and an American Society for Testing Material (ASTM)-compliant V&U-notch standard template;
• and
• S6:
• comparing, by the image processing module, the notch picture of the Charpy impact specimen with a selected standard model using a well-trained residual neural network (ResNet), computing a similarity to determine whether a notch is qualified, and displaying a result on the touchscreen (301), thereby completing a work cycle for inspecting the notch of the Charpy impact specimen.