CN210587168U

CN210587168U - Forming die for preparing filter element blind pipe

Info

Publication number: CN210587168U
Application number: CN201921510936.3U
Authority: CN
Inventors: 霍光; 陆有俊; 杨军军; 匡星; 刘冠颖; 王凡; 郭辉进; 范胜
Original assignee: Advanced Technology and Materials Co Ltd; AT&M Environmental Engineering Technology Co Ltd
Current assignee: Advanced Technology and Materials Co Ltd; AT&M Environmental Engineering Technology Co Ltd
Priority date: 2019-09-11
Filing date: 2019-09-11
Publication date: 2020-05-22
Anticipated expiration: 2029-09-11

Abstract

The utility model discloses a forming die for preparing a blind pipe of a filter element, which comprises an outer die and an inner die which are coaxially arranged, wherein a gap between the inner die and the outer die can contain the filter element, and the inner die comprises a supporting tube positioned by the outer die and an inner rubber sleeve sleeved on the outer surface of the supporting tube; the supporting tube is a blind tube, the blind end is in a conical or hemispherical shape which is gradually thinned, an annular groove is formed in the 45-degree direction of the end head, the opening of the groove is 30-120 degrees, and the inner rubber sleeve is embedded into the groove; the pipe wall of the supporting pipe is uniformly perforated, and the bottom of the groove is symmetrically provided with a plurality of small holes along the circumference. The utility model discloses make the forming process in quality of thick end external light metal powder filter core blind pipe obtain guaranteeing, can realize thick end external light blind pipe one shot forming, effectively avoid the interior gum cover to break, the condition such as pipe damage has simplified the production flow, has eliminated the problem that the external mold warp, has reduced manufacturing cost simultaneously.

Description

Forming die for preparing filter element blind pipe

Technical Field

The utility model relates to the technical field of mold, concretely relates to forming die.

Background

The metal powder filter element is a common metal filter material, has the advantages of high filter precision, large flux, small resistance, high temperature resistance, good purging effect and long service life, and is widely applied to the fields of filtration, separation, gas distribution, flow limitation and the like in the process industries of petroleum, chemical engineering, coal, nuclear industry, polycrystalline silicon, environmental protection, fine chemical engineering and the like. The metal powder filter core adopts the mode of isostatic pressing to take shape usually, can divide into interior light type filter core (also called external pressure internal light type) and two kinds of product forms of exterior light type filter core (or called internal pressure external light type) according to the shaping characteristics of filter core, and the core bar of interior light type filter core mould is the rigidity, and metal powder wraps up in the core bar outside, and pressure is passed from outside to inside by the gum cover, and the suppression powder takes shape, and the filter core blank surface that forms is coarse, and the filter core hole is smooth. And the external mold used by the external polishing type filter element is rigid, a flexible rubber sleeve is arranged in the tube, pressure is transmitted from inside to outside through the rubber sleeve, and the outer surface of the demoulded filter element is smooth. The external surface of the external light type filter element can meet the product requirement without finish machining. Subsequent machining is not needed, and the cost is saved. When the external light type filter core filters, impurity particles are not easy to adhere to the surface of the filter pipe, the back flushing cleaning effect is better than that of an internal light type, the performance is more superior, and the acceptance of the product is higher. However, the selection of the outer mold material of the outer light type mold, the combination mode of the outer mold, and the like are always a key point and a difficulty. The chinese utility model patent with publication number CN201020535Y discloses an internal pressure type cold isostatic pressing mould with flange powder filter tube, the chinese utility model patent with publication number CN201784027U discloses a mould for forming single-hole filter element, the chinese utility model patent with publication number CN109128155A discloses a method for manufacturing blind tube with powder metallurgy isostatic pressing. The bottom of the filter element blind pipe on some occasions needs to be provided with a unthreaded hole or a threaded hole so as to meet the requirements of positioning, mounting and fixing of the filter element, so that the thick-bottom (the thickness of the bottom is greater than the depth of the positioning hole and is usually more than 1 time of the wall thickness) external light metal powder filter element blind pipe needs to be prepared, but a forming die of the blind pipe does not have related literature reports at present.

We find that when the existing mold is used for preparing the blind pipe of the thick-bottom external-light metal powder filter element, such as the mold disclosed in the Chinese utility model patent with the publication numbers of CN201020535Y and CN201784027U, the problems that the inner rubber sleeve is torn in the direction of about 45 degrees of the head, the head of the outer mold is deformed and sunken, and the like can often occur. The working fluid in the isostatic pressing device enters the powder layer from the crack, so that the pressing force of the powder is lost, and the forming fails.

At present, the manufacturing of a blind pipe of a thick-bottom external light filter element mostly adopts a step-by-step forming method, wherein the first is to prepare an external light pipe by isostatic pressing, the second is to manufacture the bottom separately and finally weld the bottom together, and the process has long process flow, time and labor consumption, one more welding opening and one more weak link.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a forming die of preparation filter core blind pipe for quality obtains guaranteeing in the forming process of thick end external light metal powder filter core blind pipe, the utility model discloses can realize thick end external light blind pipe one shot forming, effectively avoid the inner rubber sleeve to break, the condition such as pipe damage has simplified the production flow, has eliminated the problem that the external mold warp, has reduced manufacturing cost simultaneously.

The utility model is used for the manufacturing of external light metal filter element selects metal powder's granularity and distribution according to the filter fineness of design, and the metal powder system includes but not limited to stainless steel, nickel base alloy, superalloy, corrosion resistant alloy, iron aluminum alloy, metallic nickel, titanium, copper or its alloy powder etc..

In order to achieve the above object, the present invention provides the following technical solutions:

a forming die for preparing a filter element blind pipe comprises an outer die and an inner die which are coaxially arranged, wherein a gap between the inner die and the outer die can contain a filter element, and the inner die comprises a supporting pipe positioned by the outer die and an inner rubber sleeve sleeved on the outer surface of the supporting pipe; the supporting tube is a blind tube, the blind end is in a conical or hemispherical shape which is gradually thinned, an annular groove is formed in the 45-degree direction of the end head, the opening of the groove is 30-120 degrees, the depth of the groove is 6mm, and the inner rubber sleeve is embedded into the groove; the pipe wall of the supporting pipe is uniformly provided with holes, and the bottom of the groove is symmetrically provided with a plurality of small holes along the circumference.

Preferably, the opening end of the supporting tube is sleeved with a lower rubber plug and positioned with an outer die.

Preferably, the other end of the outer die is sealed by an upper rubber plug.

Preferably, the upper rubber plug and the lower rubber plug at the two ends of the outer die are both fixed with the outer die through a hoop.

Preferably, a compression seam is left between the upper rubber plug and the outer die.

Preferably, the outer surface of the inner rubber sleeve is coated with a lubricant.

Preferably, the inner rubber sleeve can be two layers, and a lubricant is coated between the two layers.

Preferably, the outer die comprises an outer steel sleeve and an outer rubber sleeve sleeved on the outer surface of the outer steel sleeve.

Preferably, the outer steel sleeve is a split metal tube with a polished inner wall.

Preferably, the head part of the inner rubber sleeve supporting pipe is in a tapered or hemispherical structure and the like, and the shape of the head part is gradually thinned; at least one annular groove is arranged in the 45-degree direction on the end of the inner rubber sleeve supporting pipe.

The utility model provides a forming die of preparation filter core blind pipe, it has following beneficial effect:

1. the groove design of the supporting tube increases the compression space of the bottom in the pressing process, improves the density of the bottom, ensures the green strength of the bottom and improves the yield.

2. The groove of the supporting tube can accommodate more inner rubber sleeves, so that the inner rubber sleeves can freely extend in the isostatic pressing process and cannot be broken.

3. A compression seam is reserved between the upper rubber plug and the outer die, so that the rubber plug can transmit pressure and densify the powder in the process of compressing the powder.

4. The utility model discloses outer steel bushing adopts the form of minute mould, and the outer steel mould is automatic separately after the drawing of patterns, the taking out of the filter core pressed compact of being convenient for. The efficiency of mould dismouting has been improved, has also improved yield and surface quality.

5. When the die is used, the success rate of the filter element pressed compact reaches 99%, the phenomena of cracking of the inner rubber sleeve and sinking of the outer die are not found, the die filling and removing efficiency of the powder is improved, and the product quality is greatly improved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to these drawings.

Fig. 1 is a front view of a forming mold for preparing a blind pipe of a filter element according to an embodiment of the present invention;

fig. 2 is a top view of a forming mold for manufacturing a blind pipe of a filter element provided by the embodiment of the present invention.

Description of reference numerals:

1. supporting a tube; 101. a groove; 2. an inner rubber sleeve; 3. an outer steel jacket; 4. an outer rubber sleeve; 5. a filter element; 6a, gluing a plug; 6b, arranging a rubber plug; 7. clamping a hoop; 8. and (5) compressing the seam.

Detailed Description

In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrases "comprising … …" or "comprising … …" does not exclude the presence of additional elements in a process, method, article, or terminal that comprises the element. Further, herein, "greater than," "less than," "more than," and the like are understood to exclude the present numbers; the terms "above", "below", "within" and the like are to be understood as including the number.

As shown in fig. 1 and 2, the forming die for preparing the blind pipe of the filter element comprises an outer die and an inner die which are coaxially arranged, and a gap between the inner die and the outer die can accommodate the filter element 5. The inner mold comprises a supporting tube 1 positioned by an outer mold and an inner rubber sleeve 2 sleeved on the outer surface of the supporting tube 1.

The supporting tube 1 is a blind tube, the blind end is in a conical or hemispherical shape gradually thinning, and an annular groove 101 is formed in the 45-degree direction of the end head to accommodate more inner rubber sleeves 2, so that the inner rubber sleeves 2 can freely extend in the isostatic pressing process. The pipe wall of the supporting pipe 1 is uniformly provided with holes, and the bottom of the groove 101 is symmetrically provided with a plurality of small holes along the circumference. The inner rubber sleeve 2 is sleeved on the outer surface of the supporting tube 1, and the inner rubber sleeve 2 at the groove 101 is embedded and fixed well.

In an improved mode, the opening end sleeve of the supporting tube 1 is positioned by the lower rubber plug 6b and the outer die. The other end of the outer mold is sealed by an upper rubber plug 6 a. The metal powder is filled in a closed space formed by the inner rubber sleeve 2, the outer die, the upper rubber plug 6a and the lower rubber plug 6 b.

The upper rubber plug 6a and the lower rubber plug 6b at the two ends of the outer die are both fixed with the outer die through a hoop 7. The upper rubber plug 6a and the lower rubber plug 6b are sealed with the hoop 7.

And a compression seam 8 is reserved between the upper rubber plug 6a and the outer die, and in the isostatic pressing process, the compression seam 8 is reduced to compensate the volume change generated by the compression of the metal powder, improve the density of the bottom and increase the strength. The length of the compression slit 8 is greater than the volume of the powder which is compressed and reduced.

The number of the annular grooves 101 on the support tube 1 may be 1, 2 or more, and the grooves 101 may be arranged symmetrically or asymmetrically. The outer surface of the inner rubber sleeve 2 is coated with a lubricant, particularly at the end part, and the lubricant can be talcum powder, zinc stearate and the like. The inner rubber cover 2 may be two layers, and a lubricant may be applied between the two layers.

The outer die comprises an outer steel sleeve 3 and an outer rubber sleeve 4 sleeved on the outer surface of the outer steel sleeve 3. The outer steel jacket 3 is a split metal pipe with a polished inner wall. The outer steel sleeve 3 adopts a split form, the outer steel sleeve 3 is automatically separated after pressure relief, and the filter element pressed compact can be freely released. The efficiency of mould dismouting has been improved, has also improved yield and surface quality. The outer steel sleeve 3 adopts a split form, the parting line on the surface of the filter element green body is less, the product quality is improved, and the defect probability is reduced

Preparing a 316L stainless steel filter element with a thick bottom, wherein the outer diameter is 60mm, the wall thickness is 5mm, the length is 800mm, and the bottom is 50 mm.

A circle of grooves 101 are formed in the end of the supporting tube 1 in the 45-degree direction, the openings of the grooves 101 are 90 degrees (the openings of the grooves are larger than 0 degree and smaller than 180 degrees, and preferably 30-120 degrees), the depth is 6mm, and the depth of the compression joint 8 is 30mm (as known by a person skilled in the art, the depth of the grooves and the compression joint are matched with the compressibility of different powders).

The filtering precision is required to be 10 mu m, the powder granularity is 150 meshes and 250 meshes, isostatic pressing is carried out under the pressure of 180Mpa, smooth demoulding is carried out after pressure relief, the outer surface of a green body is smooth, the strength is higher, and the success rate reaches 99 percent.

The forming die for preparing the filter element blind pipe is mainly used for solving the problems that the inner rubber sleeve 2 is broken and the outer die is sunken and deformed when a thick-bottom outer light blind pipe is pressed, an annular groove 101 is creatively formed in the position, close to 45 degrees, of the head of the supporting pipe 1, the section of the forming die is in a semicircular shape or other smooth curved surfaces, the inner rubber sleeve 2 is sleeved on the supporting pipe 1 before charging, the inner rubber sleeve 2 is completely attached to the supporting pipe 1, the annular groove 101 is pressed into the bottom of the groove, and the inner rubber sleeve 2 is tightly attached to the surface of the groove and is slightly fixed. When isostatic pressing is performed, the bent portion of the inner rubber sleeve 2 can compensate for expansion deformation after pressurization without cracking.

A compression seam 8 is reserved between the upper rubber plug 6a and the rigid outer die, and in the isostatic pressing process, the compression seam 8 is reduced to compensate the volume change generated by the compression of the metal powder, improve the density of the bottom and increase the strength.

The rigid external mold selects a split metal pipe, and the number of the combined seams of the mold is selected according to the difficulty of demolding. In order to reduce the mold closing line of the weak link, the number of split parts and the number of mold closing lines are reduced as much as possible. The split metal pipe is convenient to disassemble and assemble, the product has few weak links, and the quality is high.

In another embodiment of the present invention, preferably, as shown in fig. 1, the head of the supporting tube of the inner rubber sleeve is a structure with gradually decreasing radial dimension from one end to the other end, where the structure with gradually decreasing radial dimension only refers to the head of the supporting tube, i.e. the top portion of the supporting tube in fig. 1, rather than limiting the overall structure of the supporting tube.

At least one annular groove is formed in the end of the supporting tube of the inner rubber sleeve.

Above-mentioned forming die of preparation filter core blind pipe, it has following beneficial effect:

2. The groove of the supporting tube can accommodate more inner sleeves, so that the inner sleeves can freely extend in the isostatic pressing process and cannot be broken.

4. The outer steel sleeve adopts a die-splitting mode, and the outer steel die is automatically separated after demolding, so that the filter element pressed compact can be conveniently taken out. The efficiency of mould dismouting has been improved, has also improved yield and surface quality.

While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.

Claims

1. A forming die for preparing a filter element blind pipe comprises an outer die and an inner die which are coaxially arranged, wherein a gap between the inner die and the outer die can contain a filter element, and the inner die comprises a supporting pipe positioned by the outer die and an inner rubber sleeve sleeved on the outer surface of the supporting pipe; the support tube is characterized in that the support tube is a blind tube, the blind end is in a conical or hemispherical shape which gradually becomes thin, an annular groove is formed in the 45-degree direction of the end head, the opening of the groove is 30-120 degrees, and the inner rubber sleeve is embedded into the groove; the pipe wall of the supporting pipe is uniformly provided with holes, and the bottom of the groove is symmetrically provided with a plurality of small holes along the circumference.

2. The forming die of claim 1, wherein the support tube open end sleeve is positioned by the lower rubber plug and the outer die.

3. The forming die of claim 2, wherein the other end of the outer die is sealed with an upper rubber plug.

4. The forming die of claim 3, wherein the upper and lower rubber plugs at both ends of the outer die are fixed with the outer die through a clamp.

5. The forming die of claim 4, wherein a compression seam is left between the upper rubber plug and the outer die.

6. The forming die of claim 1, wherein the inner gum cover is coated with a lubricant on an outer surface thereof.

7. The forming die of claim 1, wherein the inner rubber sleeve has at least one layer, and when there are more than two layers, a lubricant is coated between the layers.

8. A forming die as claimed in any one of claims 1 to 7, wherein the outer die comprises an outer steel sleeve and an outer rubber sleeve and a plurality of clips fitted over the outer surface of the outer steel sleeve.

9. The forming die of claim 8, wherein the outer steel sleeve is a split metal tube with a polished inner wall.

10. The forming die of claim 1, wherein the head of the supporting tube of the inner rubber sleeve is of a structure with gradually reduced radial size from one end to the other end; at least one annular groove is formed in the end of the supporting tube of the inner rubber sleeve.