陶瓷成型的两种分类

Classification by continuity of forming

① Continuous forming can produce embryos with a length far greater than the width and thickness using some forming methods. The billets are continuous and have consistent cross-sectional dimensions such as ribbons, rods, or tubes. In theory, this type of forming method can produce an infinite length as long as the energy source of the billets is continuously supplied. In actual production, the raw material is often cut into the required length after forming, or cut into a certain length after sintering in a continuous sintering furnace. There are powder rolling forming, extrusion forming, rolling film forming, and tape casting forming methods that belong to this type of forming method.

② Non continuous forming, except for the aforementioned continuous forming methods, all belong to non continuous forming.

Classification by presence or absence of molds

① The methods of molding, compression molding, isostatic pressing molding, injection molding, injection molding, hot pressing injection molding, and in-situ solidification molding all belong to molding. The shape and size of the billet formed by the mold forming method are determined by the mold. The most commonly used mold material is metal, and sometimes non-metallic materials are also used, such as gypsum or porous plastic molds for injection molding, and rubber or plastic molds for cold isostatic pressing molding.

② The above several forming methods that belong to continuous forming can all be classified as formless forming. In dieless forming, although the thickness of the powder rolled and film formed billets is controlled by the gap spacing of the rollers and the width also depends on the width of the rollers, the dimensions in the length direction are free. The cross-sectional shape of the extruded body is determined by the shape of the extrusion cavity outlet, and the length is also unrestricted. That is to say, the green body formed by this method has at least one direction of free size. Moreover, the rollers and control nozzles do not belong to the typical mold.

In summary, there are many methods for forming powder billets, but overall, their forming methods can be divided into the following types.

Among the various ceramic forming methods, it has become particularly important for us to choose the suitable forming method for production. The selection of molding methods should be based on the drawings or samples of the parts to determine the process route, select suitable molding methods, prepare the process, and carry out ingredient production. The selection of molding methods is mainly considered from the following aspects:

(1) Choose based on the shape, size, and thickness of the product. Usually, the shape is complex and the size is relatively small

Large and thin-walled parts can be formed by injection molding. For parts with simple rotating shapes, rolling can be used

Forming method or spinning forming method.

(2) Select based on the process performance of the billet. Billets with good plasticity are suitable for plastic forming method, which can

Blank materials with poor plasticity are suitable for injection molding or dry compression molding.

(3) Select the molding method based on the production and quality requirements of the parts. Plastic parts can be used for high production

Forming method, while injection molding method can be used for parts with small production capacity.

(4) The molding equipment should be simple, with low labor intensity and good working conditions.

(5) The technical indicators should be high and the economic benefits should be good.

In summary, when choosing advanced ceramic forming methods, we hope to ensure product quality and output

Under the premise of simple equipment, the shortest production cycle, and the lowest cost should be selected.

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