DIE-CAST PRODUCT RIGIDITY EVALUATION METHOD AND DIE-CAST PRODUCT

摘要

Provided are a die-cast product rigidity evaluation method and a die-cast product, the rigidity whereof is evaluated by the rigidity evaluation method, with which it is possible to appropriately evaluate the rigidity of a die-cast product. To this end, after carrying out a post-casting fracture test with a simple rigidity testing device, a rigidity deterioration rate is estimated on the basis of the proportion at which cold flakes are present on the fracture surface, which is obtained by observing a breakage surface. An internal defect of a prescribed range of a high-stress part of a die-cast product which is pre-derived with a stress analysis is detected with ultrasound, and when a defect rate which is the quotient of the total surface area of the internal defects of the prescribed range divided by the total defect detection surface area is less than or equal to a prescribed value, the die-cast product is evaluated as having a prescribed rigidity.