EP 0151700 B1 19880629 - INDUSTRIAL FURNACE, ESPECIALLY A MULTIPLE CHAMBER VACUUM FURNACE, FOR HEAT TREATING BATCHES OF METAL WORKPIECES
Title (en)
INDUSTRIAL FURNACE, ESPECIALLY A MULTIPLE CHAMBER VACUUM FURNACE, FOR HEAT TREATING BATCHES OF METAL WORKPIECES
Publication
Application
Priority
DE 3405244 A 19840215
Abstract (en)
[origin: US4653732A] An industrial furnace for heat-treating metallic workpieces has separate heating and cooling chambers. The latter uses a circulating cooling gas, the flow of which against or past the workpieces produces cooling or gas-quenching. The furnace may have another chamber for oil-quenching lying below the gas-cooling chamber. In order to enable the gas cooling to operate quickly and efficiently, a cooling box fed with air by ventilator fans is provided in the shape of a tunnel, with internal surfaces above and at both sides of the effective cooling space constituted by interchangeable nozzle plates (or blank plates if no nozzle openings are desired at the top or at the sides). The workpieces to be cooled rest on a platform which may be raised or lowered to adjust the distance from the top nozzle plate or lowered into an oil bath. The nozzle plates provide a choice of nozzle patterns for different articles or groups of articles to be cooled after heat treatment. The nozzle plates may have setbacks or protrusions in order to vary the spacing of the nozzle openings from the median plane of the cooling tunnel.
IPC 1-7
IPC 8 full level
C21D 1/18 (2006.01); C21D 1/773 (2006.01); C21D 9/00 (2006.01); F27B 5/04 (2006.01); F27B 9/12 (2006.01); F27D 7/04 (2006.01)
CPC (source: EP US)
C21D 1/773 (2013.01 - EP US); C21D 9/0062 (2013.01 - EP US)
Designated contracting state (EPC)
AT FR GB IT SE
DOCDB simple family (publication)
US 4653732 A 19870331; AT E35428 T1 19880715; CS 105585 A2 19880916; CS 264117 B2 19890613; DD 231375 A5 19851224; DE 3405244 C1 19850411; EP 0151700 A2 19850821; EP 0151700 A3 19851227; EP 0151700 B1 19880629; HU 202598 B 19910328; HU T43651 A 19871130; JP H0549724 B2 19930727; JP S60184625 A 19850920; PL 140026 B1 19870331; PL 250866 A1 19850827; SU 1386047 A3 19880330; YU 224884 A 19870630; YU 43395 B 19890630
DOCDB simple family (application)
US 68872485 A 19850104; AT 84113445 T 19841107; CS 105585 A 19850214; DD 27287585 A 19850130; DE 3405244 A 19840215; EP 84113445 A 19841107; HU 51185 A 19850211; JP 2017485 A 19850206; PL 25086684 A 19841211; SU 3836854 A 19850117; YU 224884 A 19841231