| 摘要 |
The invention relates to an apparatus for the continuous hardening of pump casings by means of flame hardening, with or without modifications to the core characteristics. As a result the life of the thus treated pump casing is considerably increased, even if it is exposed to a high degree of wear. This is achieved in that the horizontally positioned pump casing is moved past the flame hardening apparatus about a vertical axis and is simultaneously moved out of the horizontal position in such a way that the cooling water is removed over the already hardened inner wall surface.
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