CN117245092A - Isostatic pressing device and method capable of obtaining density homogenized green body - Google Patents
Isostatic pressing device and method capable of obtaining density homogenized green body Download PDFInfo
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- CN117245092A CN117245092A CN202311232745.6A CN202311232745A CN117245092A CN 117245092 A CN117245092 A CN 117245092A CN 202311232745 A CN202311232745 A CN 202311232745A CN 117245092 A CN117245092 A CN 117245092A
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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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Abstract
The invention provides an isostatic pressing device, which comprises an isostatic pressing chamber provided with a cavity with an opening at one end, wherein a liquid medium is arranged in the cavity, and a preformed blank is immersed in the liquid medium; the sealing pressure head is sleeved in the cavity, so that the first end of the sealing pressure head is in contact connection with the liquid medium, and sealing is realized through a sealing ring arranged on the side wall of the sealing pressure head; a through hole is formed in the sealing pressure head, and a detachable sealing plug is arranged at one end of the through hole away from the first end of the sealing pressure head; the sealing pressure head is pressed down, gas between the sealing pressure head and the liquid medium is discharged through the through hole, and the through hole is blocked through the sealing plug after the gas is discharged, so that the cavity of the isostatic pressing chamber is sealed; and a pressure source in contact with the second end of the sealing ram. The isostatic pressing device forms an isostatic pressing liquid environment through multistage dense partial pressure, improves uniformity of material density distribution, and is exquisite in structural design, simple to operate, high in safety and low in cost.
Description
Technical Field
The invention relates to the technical field of cold isostatic pressing, in particular to an isostatic pressing device, and particularly relates to an isostatic pressing device and method capable of obtaining a density homogenized green body.
Background
The powder metallurgy product is an industrial technology for preparing various products by using metal powder as a raw material through forming and sintering, and plays a role in the development of new materials. In the traditional powder metallurgy forming and pressing process, pressure is not uniform easily due to powder characteristics and the limitations of a die and equipment structure, so that density difference is caused.
The traditional powder metallurgy is mainly axial unidirectional or bidirectional compression, taking unidirectional compression as an example, the density of a powder metallurgy product blank is generally gradually increased from the center to the periphery, the density of the axial top is maximum, the density gradually decreases from the center to the center, and the density of the bottom is minimum, so that the density of a formed green body is different, and the comprehensive performance of the product is directly influenced.
The problem of green density difference can be solved by adopting an isostatic pressing method to press, but the existing isostatic pressing equipment has the problems of complex structure, huge equipment, high manufacturing cost, difficult subsequent maintenance and expensive maintenance.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the convenient and low-cost isostatic pressing device for improving the influence of the density distribution problem on the stability of the powder metallurgy performance, the isostatic pressing device can form an isostatic pressing liquid environment through multistage dense partial pressure, the uniformity of material density distribution is improved, and the isostatic pressing device has the advantages of exquisite structural design, simple operation, high safety and low cost.
According to a first aspect of the object of the present invention, there is provided an isostatic pressing device comprising:
the isostatic pressing chamber is provided with a cavity with one end open, a liquid medium is arranged in the cavity, and the preformed blank is immersed in the liquid medium;
the sealing pressure head is sleeved in the cavity of the isostatic pressing chamber, so that the first end of the sealing pressure head is in contact connection with the liquid medium, and sealing is realized through a sealing ring arranged on the side wall of the sealing pressure head;
a through hole is formed in the sealing pressure head, and a detachable sealing plug is arranged at one end of the through hole, which is far away from the first end of the sealing pressure head;
the sealing pressure head is pressed down, gas between the sealing pressure head and the liquid medium is discharged through the through hole, and the through hole is blocked through the sealing plug after the gas is discharged, so that the cavity of the isostatic pressing chamber is sealed;
and the pressure source is in contact connection with the second end of the sealing pressure head and is used for applying pressure to the sealing pressure head to press the preformed blank into a green body so as to realize the isostatic pressing process.
As an alternative implementation mode, a groove is formed in the end face of the second end of the sealing pressure head, a sealing cover plate which can be detachably installed is arranged in the groove, and the pressure source is in contact connection with the sealing cover plate.
As an alternative embodiment, at least two stages of sealing rings are provided on the side wall of the sealing ram.
As an alternative embodiment, the liquid medium is hydraulic oil.
As an alternative embodiment, the inner diameter of the cavity of the isostatic pressing chamber is 30-80 mm and the height is 60-120 mm.
As an alternative embodiment, the preform is post-cured by liquid rubber overmolded metal powder.
As an alternative embodiment, the preform is post-cured by liquid rubber coating with loose metal powder encapsulated by latex sleeves or tinfoil.
According to a second aspect of the object of the present invention, there is provided a method of preparing a density homogenized green body using the aforementioned isostatic pressing arrangement, comprising the steps of:
placing the preformed blank in a cavity of an isostatic pressing chamber, adding a liquid medium into the cavity until the liquid medium exceeds the upper end surface of the preformed blank, and then loading a sealing pressure head into the cavity of the isostatic pressing chamber;
applying pressure to the sealing pressure head until the liquid medium overflows through the through hole in the sealing pressure head, discharging the gas in the cavity of the isostatic pressing chamber, screwing in the sealing plug, and installing the sealing cover plate according to the requirement to enable the cavity of the isostatic pressing chamber to form sealing;
transferring the isostatic pressing chamber and the sealing pressure head which are integrally installed under a pressure source, setting the pressure of the pressure source according to a preset program, and pressing the sealing pressure head downwards and maintaining the pressure;
and releasing the pressure of the pressure source after the pressure maintaining is finished, taking out the sealing plug, and after air enters the cavity of the isostatic pressing chamber, disassembling the sealing pressure head, taking out the green body and finishing the isostatic pressing process.
As an alternative embodiment, the pressure source is set to a pressure in the range of 100MPa to 500MPa.
As an alternative embodiment, the amount of hydraulic oil is 10mm and above beyond the upper end face of the preform.
By the technical scheme, the isostatic pressing device capable of obtaining the density-homogenized green body is provided, and the isostatic pressing liquid environment is formed by multi-stage partial pressure, so that the uniformity of material density distribution is improved, the density uniformity of the obtained formed green body is good, and the comprehensive performance of the product is excellent.
The isostatic pressing device can realize adjustment of pressure parameters through stress calculation according to product requirements, improves production progress and efficiency, is exquisite in design, is beneficial to reducing risk of high-voltage equipment, is simple in equipment operation, is beneficial to reducing production cost, and improves stability of product performance.
Drawings
Fig. 1 is a front view of an isostatic pressing arrangement of the invention.
Fig. 2 is a cross-sectional view of the isostatic pressing arrangement of the invention.
Fig. 3 is a schematic view of the structure of the sealing ram of the present invention.
FIG. 4 is a comparison of the pictures before and after isostatic pressing of example 1 of the present invention; wherein a is the bottom of the sample before isostatic pressing; b is the top of the sample before isostatic pressing; c is the sample thickness before isostatic pressing; e is the sample bottom of example 1; f is the top of the sample of example 1; g is the sample thickness of example 1.
Reference numerals illustrate: 100. an isostatic pressing chamber; 110. a liquid medium; 120. a liquid rubber; 130. a metal powder; 200. sealing the pressure head; 210. a seal ring; 220. a through hole; 230. sealing and plugging; 240. a groove; 250. sealing the cover plate; 300. a pressure source.
Detailed Description
For a better understanding of the technical content of the present invention, specific examples are set forth below, along with the accompanying drawings.
Aspects of the invention are described in this disclosure with reference to the drawings, in which are shown a number of illustrative embodiments. The embodiments of the present disclosure are not necessarily intended to include all aspects of the invention. It should be appreciated that the various concepts and embodiments described above, as well as those described in more detail below, may be implemented in any of a wide variety of ways.
Isostatic pressing device
Referring to fig. 1-3, an exemplary isostatic pressing apparatus for obtaining a density homogenized green body in accordance with the present invention comprises:
the isostatic pressing chamber 100 is provided with a cavity with one end open, a liquid medium 110 is arranged in the cavity, and the preformed blank is immersed in the liquid medium 110.
As an alternative embodiment, the liquid medium 110 includes, but is not limited to, hydraulic oil.
In one alternative embodiment, the preform is post-cured by liquid rubber 120 over-molded metal powder 130.
In another alternative embodiment, the preform is post-cured by coating the liquid rubber 120 with loose metal powder 130 encapsulated by latex sleeves or tinfoil.
It can be appreciated that when the metal powder has a certain shape, i.e. the metal powder is not loose, the package can be formed directly by spraying liquid rubber; when the metal powder is loose powder, auxiliary means such as a latex sleeve or a tin foil package are adopted, the metal powder is gathered together, and then liquid rubber is sprayed to form a package;
the wrapping is to maintain the integrity and operability of the blank during the subsequent pressing process, the liquid rubber is based on the convenience brought by the property of the liquid rubber, and other elastic materials can be used for wrapping.
The sealing pressure head 200 is sleeved in the cavity of the isostatic pressing chamber, so that the first end of the sealing pressure head is in contact connection with the liquid medium 110, and sealing is realized through a sealing ring 210 arranged on the side wall of the sealing pressure head;
a through hole 220 is formed in the sealing pressure head 200, and a detachable sealing plug 230 is arranged at one end of the through hole 220 away from the first end of the sealing pressure head;
wherein, the sealing pressure head is pressed down and the gas between the sealing pressure head 200 and the liquid medium 110 is discharged through the through hole 220, and the through hole 220 is blocked by the sealing plug 230 after the gas is discharged, so that the cavity of the isostatic pressing chamber is sealed.
It will be appreciated that the sealing ram is removable from the isostatic chamber in two parts to facilitate the addition of the preform and liquid medium into the cavity of the isostatic chamber.
And a pressure source 300 is in contact connection with the second end of the sealing ram 200 and is used for applying pressure to the sealing ram 200 to press the preformed blank into a green body, thereby realizing an isostatic pressing process.
As an alternative embodiment, the second end surface of the sealing ram is provided with a groove 240, a sealing cover plate 250 which is detachably installed is arranged in the groove 240, and the pressure source 300 is in contact connection with the sealing cover plate 250.
Further, one end of the through hole 220 near the groove 240 is located at the center of the groove, and when the sealing pressure head is pressed down to enable the liquid medium 110 to overflow into the groove of the sealing pressure head through the through hole, a sealing cover plate is installed in the groove, so that further sealing is formed, and sealing effect is improved.
As an alternative embodiment, at least two stages of sealing rings 210 are provided on the side walls of the sealing ram for sealing the sealing ram to the cavity of the isostatic pressing chamber.
As an alternative embodiment, the inner diameter of the cavity of the isostatic pressing chamber is 30-80 mm and the height is 60-120 mm.
Method for obtaining density-homogenized green bodies
With the aforementioned isostatic pressing arrangement of the invention, an exemplary method for preparing a density homogenized green body is provided, comprising the steps of:
placing the preformed blank in a cavity of an isostatic pressing chamber, adding a liquid medium into the cavity until the liquid medium exceeds the upper end surface of the preformed blank, and then loading a sealing pressure head into the cavity of the isostatic pressing chamber;
applying pressure to the sealing pressure head until the liquid medium overflows through the through hole in the sealing pressure head, discharging the gas in the cavity of the isostatic pressing chamber, screwing in the sealing plug, and installing the sealing cover plate according to the requirement to enable the cavity of the isostatic pressing chamber to form sealing;
transferring the isostatic pressing chamber and the sealing pressure head which are integrally installed under a pressure source, setting the pressure of the pressure source according to a preset program, and pressing the sealing pressure head downwards and maintaining the pressure;
and releasing the pressure of the pressure source after the pressure maintaining is finished, taking out the sealing plug, and after air enters the cavity of the isostatic pressing chamber, disassembling the sealing pressure head, taking out the green body and finishing the isostatic pressing process.
As an alternative embodiment, the pressure setting range of the pressure source is 100MPa to 500MPa; the dwell time is 60 s-120 s.
It can be appreciated that the pressure and dwell time are determined based on product demand, and theoretical data can be obtained by force calculation, and then adjusted as needed during actual production.
As an alternative embodiment, the amount of hydraulic oil is 10mm and above beyond the upper end face of the preform.
As an alternative embodiment, the metal species of the metal powder include, but are not limited to, nickel and nickel-copper alloys, stainless steel, titanium and titanium alloys, and iron-aluminum alloys.
In one particular embodiment, the isostatic pressing method for obtaining a density homogenized green body comprises the following specific steps:
step 1, uniformly coating and curing powder through liquid rubber to obtain a preformed blank, and placing the preformed blank in a cavity of an isostatic pressing chamber; wherein the molding powder is directly sprayed with liquid rubber, and the loose powder can be packaged by a latex sleeve or tin foil and then sprayed with liquid latex.
And 2, adding a liquid medium into the cavity of the isostatic pressing chamber until the liquid medium exceeds the upper end surface of the preformed blank by more than 10mm, and then loading a sealing pressure head provided with a multi-stage sealing ring into the cavity of the isostatic pressing chamber.
And 3, applying pressure to discharge the gas in the cavity of the isostatic pressing chamber until the isostatic liquid medium enters the groove of the sealing pressure head, screwing in the sealing plug and loading the sealing plug into the sealing cover plate.
And 4, transferring the isostatic pressing chamber which is integrally arranged to a pressure source, setting corresponding pressure, pressing, isostatic pressing and pressure maintaining.
And 5, releasing the pressure of the pressure source after the pressure maintaining is finished, sequentially taking out the sealing cover plate and the sealing plug, disassembling the sealing pressure head after air enters the sealing cavity, and finally taking out the green compact to finish the isostatic pressing process.
The following description of the specific implementation is made in connection with specific examples.
The nickel-based materials used in the following examples and comparative examples were composed of: 99.88% of Ni, 0.027% of C, 0.084% of O, 0.0053% of S, 0.001% of Co and 0.001% of Fe.
In examples 1 to 3, one-way pressing (density 4.4 g/cm) 3 300 Mpa-unidirectional pressing) formed powder, designated as unidirectional pressed nickel-based green compact.
{ example 1}
And (1) taking a unidirectional pressed nickel-based green body, uniformly spraying liquid rubber on the surface of the nickel-based green body, and placing the nickel-based green body in a cavity of an isostatic pressing chamber after the liquid rubber is solidified.
And (2) adding L-HM46 hydraulic oil into a cavity (diameter is 50 mm) of the isostatic pressing chamber until the hydraulic oil exceeds the upper end surface of the nickel-based green compact by more than 10mm, and then loading a sealing pressure head provided with a 2-stage sealing ring into the isostatic pressing chamber.
And (3) applying pressure to discharge gas in the isostatic pressing chamber, observing that hydraulic oil enters a groove of the sealing pressure head, screwing in the sealing plug, and loading the sealing plug into the sealing cover plate.
And (4) transferring the installed isostatic pressing device to a pressure testing machine for pressing, wherein the pressure is set to 780KN-400Mpa, and the pressure maintaining time is 60s.
And (5) closing the pressure testing machine after pressure maintaining is finished, sequentially taking out the sealing cover plate and the sealing plug, disassembling the sealing pressure head after air enters the sealing cavity, and finally taking out the powder green compact to finish the isostatic pressing process.
{ example 2}
And (1) taking a unidirectional pressed nickel-based green body, uniformly spraying liquid rubber on the surface of the nickel-based green body, and placing the nickel-based green body in an isostatic pressing chamber after the liquid rubber is solidified.
And (2) adding L-HM46 hydraulic oil into a cavity (diameter is 50 mm) of the isostatic pressing chamber until the hydraulic oil exceeds the upper end surface of the nickel-based green compact by more than 10mm, and then loading a sealing pressure head provided with a 2-stage sealing ring into the isostatic pressing chamber.
And (3) applying pressure to discharge gas in the isostatic pressing chamber, observing that hydraulic oil enters a groove of the sealing pressure head, screwing in the sealing plug, and loading the sealing plug into the sealing cover plate.
And (4) transferring the installed isostatic pressing device to a pressure testing machine for pressing, wherein the pressure is set to 980KN-500Mpa, and the pressure maintaining time is 60s.
And (5) closing the pressure testing machine after pressure maintaining is finished, sequentially taking out the sealing cover plate and the sealing plug, disassembling the sealing pressure head after air enters the sealing cavity, and finally taking out the powder green compact to finish the isostatic pressing process.
{ example 3}
And (1) taking a unidirectional pressed nickel-based green body, uniformly spraying liquid rubber on the surface of the nickel-based green body, and placing the nickel-based green body in an isostatic pressing chamber after the liquid rubber is solidified.
And (2) adding L-HM46 hydraulic oil into a cavity (diameter is 50 mm) of the isostatic pressing chamber until the hydraulic oil exceeds the upper end surface of the nickel-based green compact by more than 10mm, and then loading a sealing pressure head provided with a 2-stage sealing ring into the isostatic pressing chamber.
And (3) applying pressure to discharge gas in the isostatic pressing chamber, observing that hydraulic oil enters a groove of the sealing pressure head, screwing in the sealing plug, and loading the sealing plug into the sealing cover plate.
And (4) transferring the installed isostatic pressing device to a pressure testing machine for pressing, wherein the pressure is set to 980KN-500Mpa, and the pressure maintaining time is 120s.
And (5) closing the pressure testing machine after pressure maintaining is finished, sequentially taking out the sealing cover plate and the sealing plug, disassembling the sealing pressure head after air enters the sealing cavity, and finally taking out the powder green compact to finish the isostatic pressing process.
{ example 4}
Step (1), taking nickel-based powder (bulk density 1.9 g/cm) 3 ) After the liquid rubber is solidified, the liquid rubber is placed in an isostatic pressing chamber.
And (2) adding L-HM46 hydraulic oil into a cavity (diameter is 40 mm) of the isostatic pressing chamber until the hydraulic oil exceeds the upper end surface of the aluminum foil bag by more than 10mm, and then loading a sealing pressure head provided with a 3-stage sealing ring into the isostatic pressing chamber.
And (3) applying pressure to discharge gas in the isostatic pressing chamber, observing that hydraulic oil enters a groove of the sealing pressure head, screwing in the sealing plug, and loading the sealing plug into the sealing cover plate.
And (4) transferring the installed isostatic pressing device to a pressure testing machine for pressing, wherein the pressure is set to 375KN-300Mpa, and the pressure maintaining time is 120s.
And (5) closing the pressure testing machine after pressure maintaining is finished, sequentially taking out the sealing cover plate and the sealing plug, disassembling the sealing pressure head after air enters the sealing cavity, and finally taking out the powder green compact to finish the isostatic pressing process.
{ example 5}
Step (1), taking nickel-based powder (bulk density 1.9 g/cm) 3 ) After the liquid rubber is solidified, the liquid rubber is placed in an isostatic pressing chamber.
And (2) adding L-HM46 hydraulic oil into a cavity (diameter is 40 mm) of the isostatic pressing chamber until the hydraulic oil exceeds the upper end surface of the aluminum foil bag by more than 10mm, and then loading a sealing pressure head provided with a 3-stage sealing ring into the isostatic pressing chamber.
And (3) applying pressure to discharge gas in the isostatic pressure chamber, observing that hydraulic oil enters a groove of the sealing pressure head, screwing in an exhaust sealing plug, and loading the sealing cover plate.
And (4) transferring the installed isostatic pressing device to a pressure testing machine for pressing, wherein the pressure is set to be 502KN-400Mpa, and the pressure maintaining time is 120s.
And (5) closing the pressure testing machine after pressure maintaining is finished, sequentially taking out the sealing cover plate and the sealing plug, disassembling the sealing pressure head after air enters the sealing cavity, and finally taking out the powder green compact to finish the isostatic pressing process.
{ example 6}
Step (1), taking nickel-based powder (bulk density 1.9 g/cm) 3 ) After the liquid rubber is solidified, the liquid rubber is placed in an isostatic pressing chamber.
And (2) adding L-HM46 hydraulic oil into a cavity (diameter is 40 mm) of the isostatic pressing chamber until the hydraulic oil exceeds the upper end surface of the aluminum foil bag by more than 10mm, and then loading a sealing pressure head provided with a 3-stage sealing ring into the isostatic pressing chamber.
And (3) applying pressure to discharge gas in the isostatic pressing chamber, observing that hydraulic oil enters a groove of the sealing pressure head, screwing in the sealing plug, and loading the sealing plug into the sealing cover plate.
And (4) transferring the installed isostatic pressing device to a pressure testing machine for pressing, wherein the pressure is set to 628KN-500Mpa, and the pressure maintaining time is 120s.
And (5) closing the pressure testing machine after pressure maintaining is finished, sequentially taking out the sealing cover plate and the sealing plug, disassembling the sealing pressure head after air enters the sealing cavity, and finally taking out the powder green compact to finish the isostatic pressing process.
The test conditions are shown in Table 1, the test results are shown in Table 2, and the test comparison effect is shown in FIG. 4;
table 1: test condition table
Table 2: test results
As can be seen in combination with tables 1, 2 and 4, the nickel-based green material produced by the apparatus and method of the present invention has the advantages of:
(1) High strength, high density, and uniform density distribution, wherein:
different shaping modes: under the condition of the same forming pressure, the isostatic pressing is compared with the unidirectional pressing of the nickel-based green body, the strength is at least 0.29Kn higher, and the density is at least 0.44g/cm higher 3 The limit density difference is as low as 0.29g/cm 3 ；
The isostatic pressing treatment time is the same: the strength and the density are gradually increased along with the increase of the pressure;
the isostatic treatment pressure is the same: the strength and the density are gradually increased along with the increase of time;
the method can be used for improving the density difference of the powder pressed compact, further improving the density and strength of the green compact, reducing the risk of expansion of the rear cracks in the rear engineering and reducing the fluctuation of the material performance caused by the density difference.
(2) Compared with the traditional unidirectional or bidirectional pressing method, the powder metallurgy material prepared by the method and the isostatic pressing device has better material performance, and particularly, the powder metallurgy blank has better density uniformity and crack expansibility, and can be applied to various industrial industries such as research, production and the like.
(3) The isostatic pressing device has the advantages of exquisite design, small occupied area, low manufacturing cost, simple operation and high safety, and is more beneficial to further industrial popularization.
While the invention has been described with reference to preferred embodiments, it is not intended to be limiting. Those skilled in the art will appreciate that various modifications and adaptations can be made without departing from the spirit and scope of the present invention. Accordingly, the scope of the invention is defined by the appended claims.
Claims (10)
1. An isostatic pressing arrangement comprising:
an isostatic pressing chamber (100) provided with a cavity with one end open, wherein a liquid medium (110) is arranged in the cavity, and a preformed blank is immersed in the liquid medium (110);
the sealing pressure head (200) is sleeved in the cavity of the isostatic pressing chamber, so that the first end of the sealing pressure head is in contact connection with the liquid medium (110), and sealing is realized through a sealing ring (210) arranged on the side wall of the sealing pressure head;
a through hole (220) is formed in the sealing pressure head (200), and a detachable sealing plug (230) is arranged at one end, far away from the first end of the sealing pressure head, of the through hole (220);
the sealing pressure head is pressed down, gas between the sealing pressure head (200) and the liquid medium (110) is discharged through the through hole (220), and the through hole (220) is blocked through the sealing plug (230) after the gas is discharged, so that the cavity of the isostatic pressing chamber is sealed;
and the pressure source (300) is in contact connection with the second end of the sealing pressure head (200) and is used for applying pressure to the sealing pressure head (200) to press the preformed blank into a green body so as to realize an isostatic pressing process.
2. The isostatic pressing device as claimed in claim 1, wherein a groove (240) is arranged on the second end face of the sealing pressure head, a sealing cover plate (250) which is detachably installed is arranged in the groove (240), and the pressure source (300) is in contact connection with the sealing cover plate (250).
3. An isostatic pressing arrangement as claimed in claim 1, wherein at least two stages of sealing rings (210) are provided on the side wall of the sealing ram.
4. An isostatic arrangement according to claim 1, wherein the liquid medium (110) is hydraulic oil.
5. The isostatic pressing apparatus for obtaining a density homogenized green body of claim 1, wherein the cavity of the isostatic pressing chamber has an inner diameter of 30 mm-80 mm and a height of 60 mm-120 mm.
6. The isostatic device as claimed in claim 1, wherein the preform is post-cured by liquid rubber (120) over-molded metal powder (130).
7. The isostatic device as claimed in claim 1, wherein the preform is post-cured by coating a loose metal powder (130) encapsulated by a latex sleeve or tin foil with a liquid rubber (120).
8. A method of preparing a density homogenized green body using an isostatic press as claimed in any one of claims 1-7, comprising the steps of:
placing the preformed blank in a cavity of an isostatic pressing chamber, adding a liquid medium into the cavity until the liquid medium exceeds the upper end surface of the preformed blank, and then loading a sealing pressure head into the cavity of the isostatic pressing chamber;
applying pressure to the sealing pressure head until the liquid medium overflows through the through hole in the sealing pressure head, discharging the gas in the cavity of the isostatic pressing chamber, screwing in the sealing plug, and installing the sealing cover plate according to the requirement to enable the cavity of the isostatic pressing chamber to form sealing;
transferring the isostatic pressing chamber and the sealing pressure head which are integrally installed under a pressure source, setting the pressure of the pressure source according to a preset program, and pressing the sealing pressure head downwards and maintaining the pressure;
and releasing the pressure of the pressure source after the pressure maintaining is finished, taking out the sealing plug, and after air enters the cavity of the isostatic pressing chamber, disassembling the sealing pressure head, taking out the green body and finishing the isostatic pressing process.
9. The method of claim 8, wherein the pressure source is set to a pressure in the range of 100MPa to 500MPa.
10. The method of claim 8, wherein the liquid medium introduced into the cavity is hydraulic oil, and the amount of hydraulic oil is 10mm and more beyond the upper end surface of the preform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311232745.6A CN117245092A (en) | 2023-09-22 | 2023-09-22 | Isostatic pressing device and method capable of obtaining density homogenized green body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311232745.6A CN117245092A (en) | 2023-09-22 | 2023-09-22 | Isostatic pressing device and method capable of obtaining density homogenized green body |
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| Publication Number | Publication Date |
|---|---|
| CN117245092A true CN117245092A (en) | 2023-12-19 |
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| CN202311232745.6A Pending CN117245092A (en) | 2023-09-22 | 2023-09-22 | Isostatic pressing device and method capable of obtaining density homogenized green body |
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| CN (1) | CN117245092A (en) |
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- 2023-09-22 CN CN202311232745.6A patent/CN117245092A/en active Pending
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