A Forming Die for Preparing Dead Tubes of Thick Bottom Outer Light Metal Powder Filter Elements

Abstract

The invention discloses a forming mold for preparing a blind pipe of a thick-bottomed outer light metal powder filter element, which comprises an outer mold and an inner mold coaxially arranged, the gap between the inner mold and the outer mold can accommodate the filter core, and the inner mold is composed of The support tube positioned by the outer mold and the inner rubber sleeve set on the outer surface of the support tube; the support tube is a blind tube, and the blind end is tapered or hemispherical tapering shape, opening at 45 degrees at the end There is an annular groove, and the inner rubber sleeve is embedded in the groove; the pipe wall of the support pipe is evenly opened, and the bottom of the groove is symmetrically opened with a plurality of small holes along the circumference. The forming mold for preparing the blind tube of the thick-bottomed external light metal powder filter element provided by the present invention ensures the quality during the forming process of the thick-bottom external light metal powder filter core dead tube. The rubber sleeve is broken, the tube blank is damaged, etc., which simplifies the production process, eliminates the problem of external mold deformation, and reduces the production cost.

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 external light metal powder filter element, such as the mold disclosed in the Chinese utility model patents with the publication numbers CN201020535Y and CN201784027U, the inner 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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