CIP mold, whole set cold isostatic pressing bags design and production
Due to its excellent performance, isostatic presses are widely used in magnetic materials, ceramics, cemented carbide, high temperature refractory materials, rare earth permanent magnets, carbon materials, rare metal powders and other industries. In the cold isostatic pressing molding technology, according to the different molding methods, the wrapping and the mold are divided into the wet bag method, the dry bag method, and the wrapping mold used by the balanced pressing method.
(1) Influence of powder properties on filling density. The influence of powder properties on packing density refers to the influence of powder particle shape, particle size composition and surface state on packing density. The packing density of spherical powder with regular shape is higher than that of dendritic powder with irregular shape. The packing density of powders with particle gradation is higher than that of single particle size powders.
(2) The influence of the filling method of powder. In practice, natural filling, artificial tamping, manual tamping, mechanical tamping, centrifugal filling, etc. are usually used. Among them, the natural filling density is low. Mechanically tapped with high packing density. Although artificial compaction can obtain a high filling density, it is often uneven and the surface flatness of the compact is poor.
(3) The influence of the mold itself. During the filling process, there are internal friction between powder particles and external friction between the powder and the film, which limits the fluidity of the powder in the cavity to a certain extent. to this end. The charging port of the mold should be high in the mold cavity. In order to reduce the friction between the powder and the die wall during the filling process, the surface of the die wall should be as smooth and straight as possible. Bao Kui did not say about plastic. A support device shall be provided outside the envelope. It is beneficial to increase the packing density of the powder.
The so-called isostatic pressing generally refers to cold isostatic pressing (CIP), which is a method of applying fluid (water, oil) as a transfer medium to obtain uniform static pressure on the material. That is, using the incompressibility of the liquid medium to uniformly transmit pressure, pressurize from all directions, and obtain a molding method for products. According to the different molding process, it can be divided into two forms: wet bag type and dry bag type.
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