Refractory brick's molding in the manufacturing process, refers to the refractory raw materials recuring to outside force and the model, making the blank will be processed into specified dimension and shape. However, the flow castable's construction of the latest development does not need basically external forces.
The molding of refractory brick, firstly is to satisfy the using demand of the products, when refractory brick masonry, the requirement of products must have a certain shape, precise size, and enough strength. Secondly, molding is also the efficient way to improve the physical and chemical properties of products, by shape can improve the organizational structure of products. Refractory brick has a lot of molding methods, the traditional processing methods according to how much moisture content can be divided into:
1. Semi-dry method: its blank moisture is around 5%, suitable for blank of different clinker content(50% 100%).
2. Plastic method: its blank moisture is around 15%, suitable for manufacturing large or complicated shape of the products.
3. Grouting method: its blank moisture is around 40%, is suitable for all kinds of hollow thin-walled refractory materials in production.
The modeling methods of refractory brick have a lot, the common used molding ways contain organic pressure molding, vibration molding, extrusion molding, ramming forming, isostatic pressure molding, casting molding, grouting, etc.
Choose what kind of molding method, mainly according to the nature of the plaster, body shape, size and other technical requirements. In addition to most of the refractory brick is made of machine pressure forming, vibratory molding is used for special-shaped body, the extrusion molding is generally used in tubular blank, slip casting molding is used for thin wall body shape.