Isostatic Pressing Molds
The isostatic press is to place the product in a closed container filled with liquid. After electrification, the pressure exerted by the liquid on each surface of the sample is equal. Under the high pressure environment, the density of the product becomes larger and the gap between the sample particles becomes smaller and get the desired shape. With the advancement of science and technology, isostatic presses are more and more widely used in the forming of powder metallurgy, composite materials, refractory materials, ceramics, cemented carbide and other materials.
The principle is: using the incompressibility and uniform pressure transmission of the liquid medium, put the prepared blank into an elastic mold made of plastic or rubber, put it into a high-pressure container, seal it, and inject the high-pressure liquid medium through a pressure pump. And transfer the pressure to the elastic die to increase the pressure on the blank pressure.
The isostatic pressing machine is used to press the green compact with high density and uniformity, and the density can be easily controlled. Each cylinder of the isostatic press can press multiple products of the same or different shapes and sizes, and the process is simple.
The isostatic pressing mold has a crucial influence on the molding effect of CIP cold, etc. The structure of the isostatic pressing mold determines the molding effect, and the structure of the mold also affects the troublesome effect and production efficiency. The materials of isostatic pressing molds include polyurethane, rubber and silicone, etc. After comparative experiments, isostatic pressing molds made of polyurethane have detailed advantages in all aspects, and are more and more selected. In isostatic pressing, the prototype to be pressed is placed in a high-pressure container, the pressure is uniformly transmitted through the liquid pressure transmission medium, and the various parts are pressurized from all directions, so that the workpiece is formed and the desired effect is achieved. In this pressing process, the workpiece needs to be isolated from the pressure transmission medium, and cannot be in contact with the pressure transmission medium (hydraulic oil) to cause mutual contamination. This requires isostatic pressure molds (sleeves) that can meet hydraulic work.
Traditional isostatic pressing molds include isostatic pressing rubber molds, silicone molds and steel molds, and there are many problems in practical applications. As a new type of polymer material, polyurethane has many advantages such as wide range of hardness, high strength, wide adjustable range of performance, wear resistance, tear resistance, oil resistance, chemical resistance, oxidation resistance and so on. The deformation of the elastic mold under the pressure of the liquid medium is transmitted to the powder in the mold. The friction between the powder and the mold wall is small, the force of the blank is uniform, and the density distribution is uniform, and the pre-pressed blank is encapsulated. In an elastic rubber mold, it is sealed and put into a high-pressure cylinder, and the green body is compressed and formed by liquid transfer. The mold is used for the molding of ceramic materials, tungsten and molybdenum materials, graphite materials, fire-resistant materials, and alloy powders.
Jiangsu High Industry on the research and development and production of high-performance polyurethane isostatic pressing molds. Through in-depth cooperation with many isostatic pressing equipment manufacturers and in-depth study of the industry, the developed isostatic pressing polyurethane mold series products have the characteristics of long service life, high precision, small deformation, easy demoulding, etc., and are widely used in ceramics, etc. Static pressing mould, cemented carbide isostatic pressing mould, rare earth permanent magnet material isostatic pressing mould, graphite isostatic pressing mould, etc.
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