Isostatic Pressing Molds
During the powder filling process, the powder with larger particles is easy to roll on the surface of the smaller particles, and most of them are concentrated at the edge of the mold cavity, resulting in segregation of the powder particle size in the mold cavity, resulting in uneven compression ratio during molding, and compaction Size and shape will be difficult to control. In order to avoid the phenomenon of uneven accumulation of coarse and fine particles caused by the powder falling freely, the usual method is to fill the powder from the bottom of the mold cavity through the charging funnel, place the mold on the lifting platform, or hang the hopper on the lifting platform. on the device. In order to increase the filling density of the powder, keep the filling density consistent, and ensure the repeatability of the filling process, manual compaction and mechanical vibration are often used to achieve this. Small blanks and small batches are suitable for manual compaction; large compacts and large batches of production are suitable for mechanical vibration. It is better to vibrate while loading the material.
After the powder filling is completed, the charging port is sealed with an end plug, some use varnish as the adhesive to seal, or no adhesive is required, and it is best to use elastic bands for external bundling, so that during the compression deformation of the end plug , still has the function of fastening and sealing, and will not fall off. It is also effective to use iron wire to bind.
In order to improve the quality of the green compact, some products are larger in size. Before the sheath is sealed, a sponge pad or filter paper for filtering is placed between the powder and the end plug to prevent the powder from being taken away during pumping, such as using rubber The cover of the end plug can be inserted into the sponge pad through the rubber plug with the medical injection tube. The other end of the injection needle tube is connected with the vacuum system, which can realize the degassing of the powder in the cover. After the injection needle tube is taken out, the rubber stopper can Self-sealing, the easiest degassing device.
The sheathing mold and supporting attachments are easy to be dirty when the powder is loaded into the mould, and should be cleaned well to avoid bringing powder and dust into the high-pressure cylinder. If the cleaning is not clean, the powder will be brought into the medium in the cylinder. When the pressure is released under high pressure, these solid particles have high energy, which is easy to cause erosion damage to the high-pressure seals of the hydraulic system. For this reason, the outside of the jacket mold before entering the cylinder must be cleaned, and the liquid medium in the high-pressure cylinder must be replaced regularly.
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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