Durable, wear-resistant punches and dies
OwnerMarshall Hillstrominventor
Life of this patent
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Abstract
Tough, wear-resistant dies derived from cold work steel formed by powder metallurgy processing and containing not greater than about 4% of tungsten. The dies desirably contain not greater than about 4% molybdenum by weight and at least about 5% chromium by weight. Disclosed also is a punch and die combination, the die being derived from cold work steel formed by powder metallurgy processing and containing not greater than about 4% of tungsten. The punch, which may also be derived from cold work steel formed by powder metallurgy processing and containing less than about 4% by weight of tungsten, may have a formula different from that of the die. A punching method is also disclosed.
Claims18
A durable, wear-resistant die for use in turret punching operations, the die having a body derived from cold work tool steel formed by powder metallurgy processing and containing not greater than about 4% of tungsten by weight.
A durable, wear-resistant die for use in punching operations, the die having a body derived from cold work tool steel formed by powder metallurgy processing and containing from about 0.5% to about 2% of tungsten by weight.
A durable, wear-resistant die for use in punching operations, the die having a body derived from cold work tool steel formed by powder metallurgy processing and containing tungsten in an amount by weight not greater than about 2%, not greater than about 2% molybdenum by weight, and at least about 7% chromium by weight.
A punch having a punch tip and a die having an opening receiving the punch tip in a punching operation, the die having a body derived from cold work tool steel formed by powder metallurgy processing and containing not greater than about 4% of tungsten by weight.
A punch having a punch tip and a die having an opening receiving the punch tip in a punching operation, the die having a body derived from cold work tool steel formed by powder metallurgy processing and containing not greater than about 2% of tungsten, not greater than about 2% molybdenum by weight and at least about 7% chromium by weight.
A method of forming a metal workpiece on a turret punch press, comprising providing a die in said turret punch press, the die having a body derived from cold work tool steel formed by powder metallurgy processing and comprising not greater than about 4% of tungsten by weight, and performing said punching operation using said die.
Dependencies are inferred from the claim text.