DOUBLE LAYERED REFRACTORY PRODUCTS, AUTOMATICALLY PRESSED OF TWO DIFFERENT MATERIALS IN ONE SINGLE WORKING CYCLE

摘要

Functional refractory elements like sliding gates and nozzles as well as bricks are often made of highly wear resistant, high performance and therefore costly raw materials. But normally only the surface which gets into contact with the steel needs to be of such high quality material. The basic structure of the refractory element, however, could also be made of a less costly material. Using two materials in a sandwich layer therefore can decrease cost in a very effective and efficient way. Some refractory companies are known to manufacture such products by using two separate pieces, mounted together after pressing and sintering. Others use a manual filling procedure to press these elements in one piece. Both methods are time and labor intensive and are thus still expensive. The author describes a method for an automated filling and pressing of double layered products, exemplified by the process of pressing a sliding gate. The example shows, that not only two layers are possible but also that a more complex 3D geometry can be realized. By using a high performance hydraulic press the cycle time increases only by approx. 10 sec. compared to a single filling process. This technology will make high resistive wear elements available at a most competitive price.