Quality evaluation method and quality evaluation device

A quality evaluation method for evaluating a quality of a cylinder block of an engine, the quality evaluation method comprising:

• performing a non-destructive inspection on the cylinder block, by an inspection device, to obtain at least one detection result;
• acquiring the at least one detection result, by a quality evaluation device, from the inspection device;
• detecting at least one defect present in the cylinder block, by the quality evaluation device, based on the at least one detection result;
• extracting one or more feature amounts, by the quality evaluation device, from detection information of the at least one defect;
• specifying at least one evaluation target site in which the at least one defect is present in the cylinder block, by the quality evaluation device, wherein the at least one evaluation target site includes an oil flow path, a cooling water flow path, a connection portion by bolt joining with a cylinder head, and a connection portion by bolt joining with a radiator;
• acquiring one or more usage state information values associated with the at least one evaluation target site, by the quality evaluation device,
• wherein the one or more usage state information values comprise a value that indicates a degree of load applied to the at least one evaluation target site when the cylinder block is used;
• determining, based at least on the one or more feature amounts and the one or more usage state information values, by the quality evaluation device, whether the at least one defect is an aggressive defect;
• predicting whether the cylinder block is repairable based on the determination on whether the at least one defect is an aggressive defect;
• and
• when the at least one defect is determined to be an aggressive defect, outputting an image to a user interface to allow visual confirmation of a position of the at least one defect,
• wherein the image represents a shape of the cylinder block and the position of the at least one defect with respect to a surface of the cylinder block.