CN111014665A - Waterproof method applied to isostatic pressing die - Google Patents
Waterproof method applied to isostatic pressing die Download PDFInfo
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- CN111014665A CN111014665A CN201911377070.8A CN201911377070A CN111014665A CN 111014665 A CN111014665 A CN 111014665A CN 201911377070 A CN201911377070 A CN 201911377070A CN 111014665 A CN111014665 A CN 111014665A
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- Prior art keywords
- isostatic pressing
- die
- isostatic
- pressing die
- method applied
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
- B22F3/04—Compacting only by applying fluid pressure, e.g. by cold isostatic pressing [CIP]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
- B22F3/03—Press-moulding apparatus therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/002—Sealings comprising at least two sealings in succession
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Press Drives And Press Lines (AREA)
Abstract
The invention discloses a waterproof method applied to an isostatic pressing die, which is based on isostatic pressing equipment and a vacuum sealing machine and specifically comprises the following steps: firstly, metal powder is filled into an isostatic pressing die, and after the metal powder is compacted in a vibration mode, a plug is placed into a port of the isostatic pressing die for plugging; secondly, the sealing parts of the plugs at the two ends of the isostatic pressing die are tightened by iron hoops, and grease is smeared at the gap between the plugs and the isostatic pressing die; and thirdly, wrapping the isostatic pressing mould by using a waterproof bag, vacuumizing and sealing the waterproof bag by using a vacuum seal, and finally putting the sealed isostatic pressing mould into isostatic pressing equipment for pressing. The invention adopts multilayer sealing measures, and the iron hoop fixes the plugs at two ends of the isostatic pressing die, so as to prevent the plugs from sliding outwards in the pressurizing or pressure releasing process; the gap between the die and the plug is coated with butter, and the outermost layer of the die is sealed by a waterproof bag for waterproofing, so that the waterproof performance of the die in the pressing process can be effectively improved.
Description
Technical Field
The invention relates to the technical field of powder forming, in particular to a waterproof method applied to an isostatic pressing die.
Background
The isostatic pressure working principle is Pascal's law: "the pressure of the medium (liquid or gas) in the closed vessel can be transmitted equally in all directions. The isostatic pressing technology has a history of more than 70 years, and is mainly applied to powder molding of powder metallurgy in the initial stage; for nearly 20 years, isostatic pressing technology has been widely used in the fields of ceramic casting, atomic energy, tool manufacturing, plastics, ultra-high pressure food sterilization and graphite, ceramics, permanent magnets, high-voltage electromagnetic porcelain bottles, biological medicine preparation, food preservation, high-performance materials, military industry and the like. The isostatic pressing technology is that at normal temperature, rubber or plastic is usually used as a sheathing die material, liquid is used as a pressure medium and is mainly used for forming powder materials, and a blank is provided for further sintering, forging or hot isostatic pressing procedures. The pressure is generally 100 to 630 MPa.
When an isostatic pressing device is used for pressing some active metal powder, whether chemical reaction between working medium in the device and the active metal is possible or not needs to be considered. For example, if the working medium is water and the metal powder in the die is magnesium powder, the water and the magnesium powder can react violently and burn under a high pressure state, and the danger is very serious. Therefore, the isostatic pressing die needs to have certain waterproof performance, and the working medium water is sufficiently separated from the metal powder in the die. The existing isostatic pressing mould is generally made of rubber and polyurethane, and the sealing of the mould adopts a method of bundling by using elastic ropes in order to take the particularity of pressing active metal powder into consideration. The method cannot form strong restriction on the end cover of the die, and cannot block working medium water outside the die under the condition of high pressure, so that the water cannot be effectively prevented.
Disclosure of Invention
The invention aims to provide a waterproof method applied to an isostatic pressing die, which aims to solve the problems in the prior art, so that metal powder in the die can be separated from working medium water in a high-pressure environment, and the waterproof performance of the die in a pressing process is improved.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a waterproof method applied to an isostatic pressing die, which is based on isostatic pressing equipment and a vacuum sealing machine and specifically comprises the following steps:
step one, filling metal powder into an isostatic pressing die, compacting the metal powder in a vibration mode, and then placing a plug into a port of the isostatic pressing die for plugging;
step two, tightening the sealing parts of the plugs at the two ends of the isostatic pressing die by using iron hoops, and smearing butter at the gap between the plugs and the isostatic pressing die;
and step three, wrapping the isostatic pressing mould by using a waterproof bag, vacuumizing and sealing the waterproof bag by using a vacuum seal, and finally putting the sealed isostatic pressing mould into isostatic pressing equipment for pressing.
Preferably, in the second step, the hoop is located on the corresponding isostatic mould surface at the center of the thickness of the plug.
Preferably, in the second step, the joint of the iron hoop and the screw is wrapped by a cotton tape.
Preferably, the cotton tape is adhered with an adhesive tape for at least one circle on the outer side of the cotton tape.
Preferably, in the second step, the grease has a thickness at least capable of covering a gap between the plug and the isostatic die.
Preferably, in the third step, the waterproof bag has three layers.
Compared with the prior art, the invention has the following technical effects:
the invention adopts multilayer sealing measures, can effectively improve the waterproof performance of the mould in the pressing process, and the iron hoop is used for fixing the plugs at two ends of the isostatic pressing mould so as to prevent the plugs from sliding outwards and separating from the mould cylinder body due to different internal and external pressures in the pressurizing or pressure releasing process of the plugs; coating butter on the gap between the isostatic pressing die and the plug, which is a second waterproof process; and the outermost layer of the isostatic pressing mold is sealed by a waterproof bag for waterproofing, and the waterproof bag is the first defense line of a mold waterproofing measure.
Drawings
FIG. 1 is a schematic view showing the construction of a waterproofing method applied to an isostatic mold according to the present invention;
FIG. 2 is a schematic view showing the operation of the waterproofing method according to the present invention applied to an isostatic mold.
Wherein: 1-butter, 2-isostatic pressing die, 3-cotton tape, 4-adhesive tape, 5-iron hoop, 6-plug, 7-metal powder and 8-waterproof bag.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
The invention aims to provide a waterproof method applied to an isostatic pressing die, which aims to solve the problems in the prior art, so that metal powder in the die can be separated from working medium water in a high-pressure environment, and the waterproof performance of the die in a pressing process is improved.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1 to 2: the embodiment provides a waterproof method applied to an isostatic pressing die, which is based on isostatic pressing equipment and a vacuum sealing machine and specifically comprises the following steps:
step one, metal powder 7 is loaded into an isostatic pressing die 2, after the metal powder 7 is compacted in a vibration mode, a plug 6 is placed into a port of the isostatic pressing die 2 for plugging, and the plug 6 is sunk into the isostatic pressing die 2 for a certain distance, so that the plug 6 is convenient to seal at the later stage.
And step two, fastening the sealing parts of the plugs 6 at the two ends of the isostatic pressing die 2 by using iron hoops 5, and smearing butter 1 at the gaps between the plugs 6 and the isostatic pressing die 2. The iron hoop 5 is positioned on the surface of the isostatic pressing die 2 corresponding to the center of the thickness of the plug 6, the joint of the iron hoop 5 and the screw is wrapped by a cotton tape 3, the outer side of the cotton tape 3 is adhered by an adhesive tape 4 for at least one circle, and the thickness of the grease 1 at least can cover the gap between the plug 6 and the isostatic pressing die 2. Because there is the screw that is used for adjusting the elasticity on the iron hoop 5, there is the closed angle, easily cut the waterproof bag 8 of outside, so need wrap up one deck cotton tape 3 outside the iron hoop 5, cotton tape 3 should cover completely at iron hoop 5 surfaces for separate iron hoop 5 and waterproof bag 8, paste the sticky tape 4 of at least one deck area thickness at cotton tape 3 skin, both can fix cotton tape 3's position, can take the local cover of closed angle again, prevent that it from stabbing waterproof bag 8.
Step three, wrapping the isostatic pressing mould 2 by using the waterproof bag 8, vacuumizing and sealing the waterproof bag 8 by using a vacuum seal, and finally putting the sealed isostatic pressing mould 2 into isostatic pressing equipment for pressing. Wherein, waterproof bag 8 is the three-layer, can more effectively carry out waterproof.
The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
In summary, the following steps: the invention discloses a waterproof method applied to an isostatic pressing die, which is based on isostatic pressing equipment and a vacuum sealing machine and specifically comprises the following steps: firstly, metal powder is filled into an isostatic pressing die, and after the metal powder is compacted in a vibration mode, a plug is placed into a port of the isostatic pressing die for plugging; secondly, the sealing parts of the plugs at the two ends of the isostatic pressing die are tightened by iron hoops, and grease is smeared at the gap between the plugs and the isostatic pressing die; and thirdly, wrapping the isostatic pressing mould by using a waterproof bag, vacuumizing and sealing the waterproof bag by using a vacuum seal, and finally putting the sealed isostatic pressing mould into isostatic pressing equipment for pressing. The invention adopts multilayer sealing measures, and the iron hoop fixes the plugs at two ends of the isostatic pressing die, so as to prevent the plugs from sliding outwards in the pressurizing or pressure releasing process; the gap between the die and the plug is coated with butter, and the outermost layer of the die is sealed by a waterproof bag for waterproofing, so that the waterproof performance of the die in the pressing process can be effectively improved.
Claims (6)
1. A waterproof method applied to an isostatic pressing die is characterized in that: based on isostatic pressing equipment and a vacuum sealing machine, the method specifically comprises the following steps:
step one, filling metal powder into an isostatic pressing die, compacting the metal powder in a vibration mode, and then placing a plug into a port of the isostatic pressing die for plugging;
step two, tightening the sealing parts of the plugs at the two ends of the isostatic pressing die by using iron hoops, and smearing butter at the gap between the plugs and the isostatic pressing die;
and step three, wrapping the isostatic pressing mould by using a waterproof bag, vacuumizing and sealing the waterproof bag by using a vacuum seal, and finally putting the sealed isostatic pressing mould into isostatic pressing equipment for pressing.
2. The waterproofing method applied to an isostatic mold according to claim 1, wherein: in the second step, the iron hoop is positioned on the corresponding isostatic mould surface at the center of the thickness of the plug.
3. The waterproofing method applied to an isostatic mould according to claim 2, wherein: and in the second step, the joint of the iron hoop and the screw is wrapped by a cotton tape.
4. The waterproofing method applied to an isostatic mould according to claim 3, wherein: and adhering at least one circle of cotton tape outside the cotton tape.
5. The waterproofing method applied to an isostatic mold according to claim 1, wherein: in the second step, the thickness of the grease can at least cover the gap between the plug and the isostatic pressing die.
6. The waterproofing method applied to an isostatic mold according to claim 1, wherein: in the third step, the waterproof bag is three layers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911377070.8A CN111014665A (en) | 2019-12-27 | 2019-12-27 | Waterproof method applied to isostatic pressing die |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911377070.8A CN111014665A (en) | 2019-12-27 | 2019-12-27 | Waterproof method applied to isostatic pressing die |
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| CN111014665A true CN111014665A (en) | 2020-04-17 |
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| CN201911377070.8A Pending CN111014665A (en) | 2019-12-27 | 2019-12-27 | Waterproof method applied to isostatic pressing die |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114523107A (en) * | 2022-02-25 | 2022-05-24 | 东莞信柏结构陶瓷股份有限公司 | Profiling green body powder forming die |
| CN115740448A (en) * | 2022-12-02 | 2023-03-07 | 同创(丽水)特种材料有限公司 | Cold isostatic pressing preparation method of metal bar |
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| CN203917913U (en) * | 2014-07-05 | 2014-11-05 | 金堆城钼业股份有限公司 | A kind of cold isostatic compaction mould |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114523107A (en) * | 2022-02-25 | 2022-05-24 | 东莞信柏结构陶瓷股份有限公司 | Profiling green body powder forming die |
| CN115740448A (en) * | 2022-12-02 | 2023-03-07 | 同创(丽水)特种材料有限公司 | Cold isostatic pressing preparation method of metal bar |
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Application publication date: 20200417 |