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 Heat treatment of tool steel |
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| from +1.300 °C to -196 °C | |||
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| The work of the Weimar-based
hardening plant Reese is concentrated on the heat
treatment of tool steel according to DIN
17 350, which can be used not only for hand tools,
but also for high-quality injection moulds used in
plastics technology as well as for injection nozzles for
internal combustion engines or measuring tools, for
instance.
Innovative heat treatment techniques for components carrying an enormous load: In the case of injection nozzles for diesel engines an intense cooling down to –196 °C ensures a structure stabilization. A daily-practice example: The figure shows an injection nozzle for diesel engines consisting of a nozzle body and a nozzle flap. Both parts are joined by means of a shrink-fit connection. As the component has to carry an enormous load, only high-quality materials are used. |
The nozzle body is made of hot-worked steel
(X40CrMoV5-1; 1.2344) and the nozzle flap is made of high-speed steel (S 6-5-2;
1.3343). At first, the nozzle body is hardened to a
strength of 1200 up to 1400 MPa. Subsequently, it is
gas-nitrated after an intermediate mechanical processing.
The nozzle flap is hardened, frozen and age-hardened
twice in a vacuum furnace (figure) to a hardness of 60 +2
HRC. Both the intense cooling down to –196 °C and
the twice repeated age-hardening ensure a complete structure stabilization,
which is prerequisite for a quality-meeting shrink-fit
connection. Even the shrinking-on of both components is
carried out by the Weimar-based hardening plant Reese
through forced-directed heating of the nozzle body und
simultaneous supercooling of the nozzle flap in LN2.
For the hardening and age-hardening of high-alloy tool steel a process-controlled vacuum furnace is at disposal. |
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Web-Design & Translation: Zeres GmbH, Bochum (Germany) Copyright © 1997 Zeres GmbH, Bochum (Germany) |
