non-destructive method for detecting machining burns of a very high strength steel and color chart for calibrating machining burns of said steel.

摘要

non-destructive method for detecting machining burns of a very high strength steel and color chart for calibrating machining burns of said steel. The invention relates to a method for the effective and industrializable detection of vhs steel machining burns. For this purpose, the machined steel is immersed in an aqueous acid solution, including hydrofluoric acid and nitric acid. In order to define a burn degree, a color chart for calibrating the vhs steel machining burns detected using the above method is prepared. Said color chart may consist of pin (p1 to p10) of the examined steel subjected to deliberate damage by excessive resurfacing (or other machining modes), then submerged in the acid solution defined above. resurfacing actions can be simulated by overheated heat treatment between the aging temperature tv (eg 510 198 c for steel) and the annealing temperature of ts solution (950 198 c for said steel) . The samples are classified according to their gray level resulting from the immersion and corresponding to a predetermined hardness and thus to a predetermined level of damage.