Furnace for tempering and hardening workpieces

US3998441A · kind A · utility

Assignee

• Deutsche Gold- und Silber-Scheideanstalt Vormals Roessler

Inventors

• Rolf Schuster
• Erwin Schumann

Key dates

• Filing date: May 24, 1976
• Grant date: Dec 21, 1976
• Expiry date: May 24, 1996

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C21D1/773
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

There is provided a furnace for tempering and hardening workpieces comprising an annealing chamber and a quenching chamber constructed as a fluidized bed, the quenching chamber is arranged below the annealing chamber, the fluidized bed which is stationary during the annealing treatment serves as bottom temperature insulation for the annealing chamber, and the lateral heat insulation of the annealing chamber is extended to below the surface of the stationary fluidized bed.