Furnace and cooling systems for treating copper and its alloys
Continuous furnace for brazing copper heat exchangers
Heating and cooling of copper alloys is performed under a protective atmosphere. For brazing copper heat exchangers, continuous belt-type furnaces are used. The heat exchangers are manually positioned on the belt and removed from it after leaving the cooling zone. The furnace entry and exit openings are mounted below the conveyer height, thus reducing the consumption of protective gas. The furnaces may be of indirectly gas-fired or electrically heated design. The cooling zone is equipped with gas-to-water heat exchangers.
Chamber furnace for annealing copper alloys
For the uniform and rapid heating of brass coils, chamber furnaces have been developed to anneal and cool such coils under a protective atmosphere. The protective gas is blown onto the face ends of the coil by a system of nozzles. This design provides much shorter heating and cooling times than the established bell furnaces. A furnace of this type can accommodate one or more coils. This equipment has been protected by industrial property rights since 2003.
Cooling chamber for copper alloys
For cooling heavy copper-alloy coils (up to 30 tonnes) which need to be transferred quickly to a downstream operation after hot rolling or heat treatment, water cooling systems are used to reduce the core temperature of each coil to below 60 °C. The coils are loaded and unloaded by a hydraulically operated lifting and conveying system. The coils are placed on prisms on a rotary table while water is applied to the front by a set of nozzles. The loading and unloaded opening is closed by a pneumatically actuated sliding door.
Batch-type and continuous furnaces for annealing copper alloys
Bars, tubes and forms of copper alloy are annealed in continuous or chamber-type furnaces. In batch operations utilising a chamber furnace, the product is placed in racks in several layers, one over the other, and heated by recirculated gas. Powerful centrifugal fans recirculate the atmosphere. Heating may be either electrical or gas-fired.
Cooling is effected in an air-cooling chamber placed alongside the furnace, which is also operated by forced air flow. In addition to the furnace and the cooling chamber, a typical system will usually comprise one or more load parking stations and a motor-operated charging machine.
Continuous ovens are implemented as roller hearth furnaces with a connected air cooling section. In this case, heating and cooling are performed by high-convection nozzle systems.