Surface-Treatment Success on BMW's Large Deep-Drawing Tools

The Pulse Plasma Diffusion (PPD) special nitriding process developed by Oerlikon Balzers in Schopfheim, Germany (Pell City, AL), has proven successful in prolonging die life in the production of hoods at BMW Group. BMW has the PPD treatment applied to a three-part draw tool—a 13.8-metric-ton upper draw die, 5-ton punch and 3.5-ton blankholder. The resulting tools boast a functional layer with high hardness (900 to 1200 HV0.1) and wear resistance. Below this layer, the process forms a diffusion layer with fine dispersed-nitrogen elements, says Oerlikon Balzers, resulting in high hardness to support the functional layer.

The treated tools, say BMW officials, exhibit a high resistance to abrasive wear and excellent sliding properties.

See also: Oerlikon Balzers Coating USA Inc.

Technologies: Finishing

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