Forming die for preparing thick bottom outer-smooth metal powder filter element blind tube

Abstract

The invention discloses a forming die for preparing a thick bottom outer-smooth metal powder filter element blind tube. The forming die comprises an outer die body and an inner die body coaxial with the outer die body, and a filter element can be contained in a gap between the inner die body and the outer die body. The inner die body comprises a supporting tube positioned by the outer die body andan inner rubber sleeve arranged on the outer surface of the supporting tube in a sleeving mode. A blind tube serves as the supporting tube, the blind end of the blind tube is in a conical or semi-spherical shape becoming thinner gradually, an annular groove is formed in the 45-degree direction of the end of the blind tube, and the inner rubber sleeve is embedded in the groove. Holes are evenly formed in the tube wall of the supporting tube, and a plurality of small holes are symmetrically formed in the periphery of the bottom of the groove. According to the forming die for preparing the thickbottom outer-smooth metal powder filter element blind tube, quality is ensured in the forming process of the thick bottom outer-smooth metal powder filter element blind tube, the thick bottom outer-smooth blind tube can be formed at a time, the situations of rupture of the inner rubber sleeve, breaking of a tube blank and the like can be effectively avoided, the production process is simplified,the problem of deformation of the outer die body is solved, and meanwhile production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of molds, in particular to a forming mold. Background technique [0002] Metal powder filter element is a commonly used metal filter material, which has the advantages of high filtration precision, large flux, small resistance, high temperature resistance, good purging effect, and long life. It is widely used in petroleum, chemical, coal, nuclear industry, polysilicon , environmental protection, and fine chemical industry and other process industries such as filtration, separation, gas distribution, current limiting and other fields. Metal powder filter elements are usually formed by isostatic pressing. According to the forming characteristics of the filter element, they can be divided into two types: internal light filter element (also known as external pressure internal light type) and external light type filter element (or internal pressure external light type). The core rod of the internal light type fi...

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Problems solved by technology

In some occasions, the bottom of the blind pipe of the filter element needs to be made with a light hole or a threaded hole to meet the needs of the filter element positioning and installation, which requires the preparation of a thick bottom (the thickness of the bottom is greater than the depth of the positioning hole, usually more than 1 times the wall thickness). Light metal powder filter core blind tube, but its forming die has not seen the relevant literature reports

[0003] We found that when the existing mold is used to prepare the blind tube of the thick-bottomed outer light metal powder filter element, such as the mold disclosed in the Chinese utility model patents with the publication numbers CN201020535Y and CN201784027U, the internal rubber sleeve often occurs in the direction of about 45 degrees on the head. Problems such as tearing, deformation and depression of the outer mold head

The working fluid in the isostatic pressing equipment enters the powder layer from the cracks, resulting in loss of powder compression force and forming failure

[0004] At present, the manufacturing of thick-bottomed external light filter blind tubes mostly adopts a step-by-step forming method. The first is to prepare the external light tube by isostatic pressing, the second is to manufacture the bottom separately, and finally weld them together. This process is long, time-consuming and labor-intensive. And one more welding joint, another weak link

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