Galling is a commonly encountered problem in the stamping of sheet metal. A form of adhesive wear, galling involves sheet material transfer to the forming tool, typically occurring in the drawing operation where sliding speeds and pressures are high. A production part from the Stamping Plant, Ford Motor Company, Australia, was chosen as a case study to determine the influence of die surface preparation and die surface modification on galling behaviour and part formability. Results indicated that production run length can be increased and part formability improved significantly by decreasing the roughness of the die and through surface modification. Through the modification of die surface preparation and die surface treatment it was possible to improve the production performance of a part that was prone to galling and splitting. A six-fold increase in production run length was achieved by halving the surface roughness of the die. Surface modification offers even larger increases in production prior to die maintenance. The ranking in terms of applicability to reducing the galling tendency in this system, in descending order, was TiCN, CrCN and Hard-Cr. This result is likely to be the result of the relative hardness of the surface treatments and the evolution of dissimilar contacting bonds through surface modification. Additionally, the formability at the problem region of the part was increased with improved surface preparation and surface treatment of the die.
Improving the Galling resistance of automotive stamping tools
Erhöhung des Abriebwiderstandes von Stanzwerkzeugen der Automobilindustrie
2000
6 Seiten, 5 Bilder, 1 Tabelle, 16 Quellen
Aufsatz (Konferenz)
Englisch
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