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Dry powder pressing mold design principles and main steps

Apr 12, 2018

The Dry powder pressing mold is one of the important tools in the powder press molding process, and its quality will directly affect the quality, cost, safety, and productivity of the powder metallurgy products. It has an extremely important influence on the powder metallurgy process and components. At the same time, due to many methods of powder pressing, dry powder press molds are also varied.


Currently, classification can be made according to the pressing method used, and the Dry powder pressing mold can be divided into a pressing die, a finishing die, a recompression die, a forging die, and the like. In general, the basic principles for the design of such powder metallurgy molds are: to give full play to the features of less powder metallurgy, non-cutting processing, and near forming, to ensure that the blanks achieve geometric shape, size, precision, surface roughness, density, and Its distribution and other basic requirements.


In fact, these types of dry powder pressing mold should meet these requirements. In particular, the density and distribution of compacts and forgings are the main technical indicators in the design of the mould. In fact, only by reasonably designing the mold structure and selecting the mold materials can the mold parts have sufficiently high strength, rigidity and hardness, and have high wear resistance and service life, so as to meet the safety, reliability and ease of operation of high-pressure working containers. Claim.


At the same time, the structure of the dry powder pressing mold, the processability and interchangeability of the die parts and the manufacturing cost of the die must be taken into consideration in the actual application process. At present, when designing, the main steps are: first understand and master the relevant design information, as an important basis for mold design; secondly, material design and process design according to product requirements, and conduct billet design or preform according to product drawings. Design, and choose the press and press method, design mold structure sketch.


Next, according to the blank size, combined with the size change in the process, the dry powder die mold size is calculated. Then according to the mold assembly relationship to calculate the size of other mold parts, and finally to draw Dry powder pressing mold assembly drawings and parts drawings, according to different types of mold different work requirements, dimension deviation and shape tolerances, and select mold materials and technical requirements.