FURNACE, PARTICULARLY FOR THERMAL AND CHEMOTERMAL TREATMENT OF METAL PRODUCTS

摘要

A furnace intended particularly for large-sale thermal and chemothermal treatment of metal products using e.g. cementing, nitrocarburizing, nitriding, carbonitriding, annealing, hardening, tempering, and similar processes. The furnace is arranged to enable its upper location while it is transferred above the individual baths using the side travel. A charge is inserted in the furnace from below. The furnace can be turned round its axis that enables inserting of the grate assembly together with the product charge into the furnace and locking by its back turning motion where the edges of the lowest grate are clamped by the lock in the furnace retort to enable locking of the charge in the furnace. Said arrangement eliminates the negative effect of thermal distortion of the furnace retort that could disturb charge locking or unlocking.