| 摘要 |
<p>Equipment and method for hardening in rare gas atmosphere enable hardening tools and construction parts in the closed system of rare gas atmosphere, argon or helium without harmful appearances of oxidation, decarburizing, carburizing or nitrogen absorption in the surface of hardened parts. The equipment consists of the following vertically arranged parts: furnace (1) with retort (2), vestibule (7) and quenching basin (12). In the center of the equipment there is the lift (8) which, upon opening the retort double door (5) lowers the charge holder (4) through the vestibule (7) to the quenching bath (13). Argon is introduced by the valve (14) on the bottom of the vestibule (7) and let out to the atmosphere through the valve (15) that maintains the necessary over-pressure in the retort (2) and vestibule (7). In application of helium the direction of gas dispersion is reverse: helium is introduced through the valve (15) on the top of the retort (2) and pressed out to the atmosphere through the valve (14) on the bottom of vestibule (7).</p> |
