THERMOPROCESSING PLANTS AND EQUIPMENT FOR ALUMINIUM EXTRUSION PLANTS
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OTTO JUNKER WE UNDERSTAND METALS II_Fr°stfrei lagern FOR ALUMINIUM EXTRUSION PLANTS WWW.OTTO-JUNKER.COM UNDERSTAND METALS

I Otto Junker GmbH Established in 1924, OTTO JUNKER GmbH draws on more than 90 years of experience and continuous product development. The company is represented by subsidiaries, service agencies and sales offices all over the world. The product range embraces melting, casting, heating and heat treating equipment for the aluminium and copper industries as well as melting and casting equipment for iron and steel foundries. Our foundry in Lammersdorf produces high-grade sand castings from iron, nickel and cobalt-based materials, both as cast and fully finished. In the attached machining...

Convection Heater Convection heater The modern heater, notably where particularly close temperature tolerances or extremely low energy costs must be achieved. Gentle heating of billets is performed exclusively by means of a high-velocity fluid flow directed onto the metal from special nozzle systems (“jet heating“). Unlike a gas fired heater where the flame temperature will always far exceed the temperature of the billet, a convection heater requires only small temperature differences. It can thus attain particularly close temperature tolerances reproducibly to meet special application...

JunkerDynamicHeater® - MC The flexible type of heater is the induction heater. Operating in "lot size 1" mode, it allows the operator to set any desired temperature profile - the so-called "taper" - over the length of the billet for an isothermal extrusion process. As the induction heater heats every billet individually, billet-to-billet temperature or length variations (in conjunction with a cold saw) can be implemented without impairing the particularly close temperature tolerance. Apart from the custom-designed induction coil, OTTO JUNKER‘s IGBT frequency converter - built into hundreds...

Further unique selling points of the JunkerDynamicHeater® include the following: ■ Ceramic melt protection tube reduces energy demand. ■ OTTO JUNKER billet trough conveyor system prevents scratches and scoring on the billet surface and eliminates aluminium build-up in the coil. ■ The “blind heating sequence" increases the thermocouple maintenance interval by a factor of 2. ■ IGBT converter and coil, as core components, are built in-house and tested/adjusted before shipment.

JunkerDynamicHeater® - SC JunkerDynamicHeater® - SC is the small-footprint, low-budget solution. This easily retrofittable version of an induction heater is used to boost the output of an existing gas fired heater or to provide a temperature profiling (“taper“) capability. It is characterized by its particularly compact design, given that the so called JuDy - SC unit needs only one single short coil section. A special measuring and control process developed by OTTO JUNKER allows the temperature profile to be created dynamically during the passage of the billet.

In the case of special aluminium alloys, selective cooling of the metal may be required before and/or after the extrusion process in order to impart particular metallurgical properties to the material. Addressing this requirement, OTTO JUNKER has developed high-performance cooling systems for billets and extruded profiles which enable the user to apply reproducible, accurately controlled cooling rates. Given their precision control capabilities, our HiPreQ® systems far outperform conventional equipment. HiPreQ® billet quench ■ Metallurgical effects permit a substantial increase in extrusion...

Magazines Magazines serve to store billets or logs for use in production. The choice of the appropriate magazine for a given application depends on a mix of factors. Today, it has become standard practice to provide tracking, recording and archiving of all production data. All OTTO JUNKER magazines therefore come with a material data management capability. The production data of incoming billets or logs are entered either manually or automatically by means of a bar code reader. This information ensures, e.g., that the program will adjust the setpoints (temperatures, lengths, etc.) as...

I Handling equipment Conveyor systems are needed to move billets and logs from the magazine to the extrusion press quickly, reliably and without surface damage. As conditions differ in every extrusion press facility, the logistics need to be adapted to the local situation. To this end, OTTO JUNKER offers a modular system providing diverse standardized functions. ■ for crosswise travel ■ for lengthwise (forward/backward) travel ■ supports any number of horizontal stop positions ■ static or swing-type V-trough ■ with single trough, dual trough or two individual troughs, depending on specified...

I Cold saw, hot saw If logs are used, these must be sawn or sheared accurately into billets meeting the requisite specifications of the extrusion press. This cut-to-length operation may be carried out in the cold or heated state. From a cost efficiency aspect the “park cut“ system merits special attention. It largely avoids odd ends, if the use of split billets is permitted, regardless of whether cutting is performed with a cold saw, hot saw or hot shear. Moreover, all units come with an adjustable fixed stop and clamping systems to ensure exact billet lengths with minimum angle error. Cold...

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