RAUCH Furnace Technology GmbH

Dosing furnace MDO

RAUCH Magnesium dosing furnaces MDO are the result of consequent implementation of metallurgical awareness and related to practice concepts. In our product range, you will find furnaces up to 1200 kg/h melting rate, which are electrical heated or gas fired.

Our dosing furnaces are characterized by:

• For several applications insertable.
• Highest dosing accuracy through modern Mg pump technology up to +/-0,75 %.
• Maintenance friendly.
• State of the art safety technology.
• Operation efficiency and high availability.
• Long-living and reliable.
• Individual adaptability of customer requirement.
• Fully automatic dosing of Mg-melt into the filling chamber.
• Worldwide in use.

RAUCH dosing furnaces allow:

• The holding of Mg-alloys under controlled and reliable conditions.
• The fully automatic dosing of Mg-melt in the shot sleeve of a cold chamber casting machine.
• The safe operation of the facilities with liquid Magnesium by advanced technology.

Dosing furnace MDO R with recuperator technology

RAUCH Magnesium dosing furnaces MDO are the answer to the steadily increasing energy prices for electricity. This gas-fired furnace generation achieves up to 30% energy cost savings compared to conventional burners by using preheated combustion air.

The operating cost savings can be up to 80 %, depending on the costs for electrical energy.

As a result:

• Cost-efficient heating.
• Uniform heat distribution to the crucible.
• Exhaust energy is directly used.
• Good controllability through electrical heating of the pumpchamber.
• High life-time of the components.
• Spare- and wear part compatibility to the standard MDO.

Design:

• Design as a two-chamber furnace with melt- and pump chamber.
• Electrically heated pump chamber.
• Melt chamber heated with recuperator burners.

Advantages:

• Constant melt level as well as a stable temperature in the pump chamber, resulting in constant casting conditions.
• Design as an upward or downward pump system.
• Shot weights in a range from 0,2 kg to 30 kg and even more.
• Depending on design, dosing accuracy of ± 0,75 %.

With the Magnesium low-pressure casting system developed by RAUCH, the Magnesium casting industry is being offered a cost-efficient alternative to the conventional low-pressure technology using gas-pressure for the production of Mg parts, especially for parts such as thick-walled parts that have been difficult to cast until now.

RAUCH low-pressure casting enables:

• Transport of molten material using a Magnesium pump from the melting crucible into the mold.
• Filling according to pre-programmed process.
• Creation of a recast over several minutes to ensure mold is supplied during solidification.
• Measurement of the melting pressure in the riser pipe, measurement of piston force and path as well as measurement of the melting level in the crucible are incorporated into the control of the pump and recast piston; this ensures reliable process control and therefore consistent part quality.

The main advantages are:

• Cost-efficient.
• Higher strength values through low-pressure mold filling, near that of forged parts.
• Gravity and sand-casting procedures applicable.
• Turbulence-free mould filling, which means a pore-free structure.
• Narrow mould channels also fillable without gas pockets.

The ability to process Magnesium is becoming increasingly important. RAUCH specialises in the complex requirements of Magnesium in solid and liquid form and it offers individual complete solutions – from co-development through to implementation and follow-up support. Whether it is optimising existing systems or a new project – the expert team at RAUCH provides the decisive edge with the latest research findings and pioneering experience in the Magnesium sector!

RAUCH systems prove their worth globally with high availability, low energy and maintenance costs and simple handling. Of course, RAUCH systems ensure extremely precise dosing and the highest level of safety.

In addition to standard applications, RAUCH also provides solutions for sand casting, continuous casting and low-pressure applications.

RAUCH Magnesium melting and dosing euipment MSD has been developed to recycle class 1 return material directly at the diecasting machine. This concept offers a high level of safety, efficiency and reliability.
The so-called incell recycling is realized with a two furnace principle, where one furnace acts as a melting furnace which can melt either electrically or gas-fired up to 1200 kg/h.
The furnace is designed to melt both, ingots and runners, temperature stable and to provide an easy cleaning of the melt.
The feeding of the runners and ingots is done via an EcoJet duct system to achieve a quick melting with a low segregation of the alloying elements.
In connection with an ingot prewarming and feeding unit, it is ensured that the input material is dried and preheated.
The second furnace is an electrically heated dosing furnace with a constant temperature control and a constant melt level.
The melt transfer is done via a syphon or pump-system, which has been optimized in terms of maintenance friendly operation and cleaning to ensure a smooth supply of the melt.
The dosing system has been designed to create a maximum in terms of dosing tolerance accuracy, maintenance and up-time.

Advantages

• Fully automated system
• Return material class 1 is internally reused
• Easy change of alloys
• Electrically heated or gas-fired
• Maintenance friendly (pump, siphon, heating, ...)

Proper cleaning of the melt

Cost advantages in the foundry are competitive advantages on the market. Therefore, the expert team at RAUCH develops and produces sustainable efficiency-enhancing solutions: The optimisation of casting conditions through the provision of Zinc at a constant level and constant temperature and the re-melting of runner and biscuits reduces operating costs and increases productivity. In particular, the integration of in-plant recycling systems also reduces costs by eliminating external re-melting, transport and interim storage costs and through savings in raw material storage.

The recycling material, which is comparable to the new material in terms of quality, can be either automatically cast as ingots in a RAUCH system or more economically introduced in the production process!