CN113182517A - Quasi-near net-shape soft die for high-specific-weight tungsten alloy product blank - Google Patents
Quasi-near net-shape soft die for high-specific-weight tungsten alloy product blank Download PDFInfo
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- CN113182517A CN113182517A CN202110284500.2A CN202110284500A CN113182517A CN 113182517 A CN113182517 A CN 113182517A CN 202110284500 A CN202110284500 A CN 202110284500A CN 113182517 A CN113182517 A CN 113182517A
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- 229910001080 W alloy Inorganic materials 0.000 title claims abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 80
- 230000005484 gravity Effects 0.000 claims abstract description 19
- 230000007704 transition Effects 0.000 claims abstract description 6
- 239000004744 fabric Substances 0.000 claims description 11
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 2
- 238000011068 loading method Methods 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000007493 shaping process Methods 0.000 abstract description 6
- 230000007547 defect Effects 0.000 abstract description 3
- 239000000047 product Substances 0.000 description 28
- 238000000034 method Methods 0.000 description 14
- 238000003754 machining Methods 0.000 description 8
- 238000005245 sintering Methods 0.000 description 8
- 238000003825 pressing Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 238000009849 vacuum degassing Methods 0.000 description 7
- 238000000462 isostatic pressing Methods 0.000 description 6
- 239000012528 membrane Substances 0.000 description 6
- 239000012467 final product Substances 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 3
- 230000007306 turnover Effects 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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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
-
- 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
- B22F3/10—Sintering only
- B22F3/1035—Liquid phase sintering
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention relates to the technical field of control of processing materials of a small-size product blank of a high-specific gravity tungsten alloy; the high specific gravity tungsten alloy product blank quasi-near net-shape forming soft die comprises a soft film provided with a charging cavity, a plug head used for plugging the charging cavity and an air suction nozzle arranged on the plug head; the charging cavity comprises a square column-shaped material cavity and a cylindrical material cavity which is communicated with one end of the square column-shaped material cavity and is in smooth transition; the plug is located the side that cylindrical material chamber was kept away from to square column shape material chamber. The invention realizes the quasi-near net shaping of the blank to be processed, thereby effectively avoiding the defects of large material loading amount, long production period and complex processing of the original cylindrical soft mold, and effectively improving the production efficiency.
Description
Technical Field
The invention relates to the technical field of control of processing materials of a high specific gravity tungsten alloy small-size product blank, in particular to a quasi-near net shaping soft die of a high specific gravity tungsten alloy product blank.
Background
Under the current isostatic pressing and hydrogen sintering process route, the method generally adopts the steps of manufacturing cylindrical blank bars for sintering so as to ensure that the workpiece allowance is enough in the subsequent machining and shaping process; therefore, the material loss of the existing cylindrical blank structure bar is an important component of the product cost; even in the improvement of the structure of the soft mold in the later stage, the cylindrical shape is adjusted into the square column structure, so that the staged consumption reduction of materials is effectively realized, the optimal material control target is not reached, and the new problem of knife forging in the subsequent machining link is also exposed.
Disclosure of Invention
The invention aims to solve the technical problem of providing a high specific gravity tungsten alloy product blank quasi-near net shaping soft die; the method realizes the quasi-near-net forming of the blank to be processed, thereby effectively avoiding the defects of large material loading, long production period and complex processing of the original cylindrical soft mold, and effectively improving the production efficiency.
The technical problem to be solved by the invention is as follows:
a high specific gravity tungsten alloy product blank quasi-near net-shape soft die mould comprises a soft film provided with a charging cavity, a plug head used for plugging the charging cavity and an air suction nozzle arranged on the plug head; the charging cavity comprises a square column-shaped material cavity and a cylindrical material cavity which is communicated with one end of the square column-shaped material cavity and is in smooth transition; the plug is located the side that cylindrical material chamber was kept away from to square column shape material chamber.
The square cylindrical material cavity and the cylindrical material cavity are in smooth transition to form a charging cavity with the shape close to that of a final product, so that the material loading amount is effectively reduced; the invention introduces the concept of quasi-near net blank body molding, designs the soft film, and realizes the decrease of the material loading by 30 percent on the original basis in the whole process.
In some possible embodiments, the radius of curvature of the junction of the square cylindrical material cavity and the cylindrical material cavity is 6.67-8.33.
In some possible embodiments, the square column shaped material cavity has a cross-sectional dimension of 23mm by 23 mm; the diameter of the cylindrical material cavity is 21 mm.
In some possible embodiments, in order to effectively realize the charging in the charging cavity, the outer side of the soft film is sleeved with an outer mold support.
Preferably, the overmold support is an aluminum film.
In some possible embodiments, the plug head comprises a plug body used in cooperation with the square cylindrical material cavity, and a plug cap connected with one end of the plug body away from the square cylindrical material cavity; the plug head is provided with a mounting hole penetrating through the plug cap and the plug body; the air suction nozzle is installed in the installation hole.
In some possible embodiments, in order to effectively avoid the problem that the end edge breakage in the demolding stage after pressing affects the machining allowance, the mounting hole comprises a first hole penetrating through the plug cap and the plug head, and a second hole which is coaxially connected with the first hole and is positioned at one end of the plug body far away from the plug cap; filter cloth is arranged on the second hole; the filter cloth and one end of the plug body close to the square cylindrical material cavity are coplanar.
The diameter of the second hole is larger than that of the first hole.
In some possible embodiments, the square cylindrical material cavity, the cylindrical material cavity and the mounting hole are coaxially arranged.
In some possible embodiments, the outer side of the soft membrane is provided with an annular boss cooperating with the stopper cap.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the soft die with the square cylindrical material cavity and the cylindrical material cavity is arranged, so that the processing quality of small-special-shaped high-specific gravity alloy products is ensured, and the material consumption of the blank body is obviously reduced; the production efficiency of the small special-shaped high-specific-gravity alloy product is improved;
according to the invention, by adopting the coplanar design of the filter cloth and the end face of the plug body, the problem that machining allowance is influenced by end edge breakage in the demoulding stage after pressing is effectively avoided.
Drawings
FIG. 1 is a schematic cross-sectional view of the present invention;
FIG. 2 is a schematic view of the connection between the flexible membrane and the outer mold support according to the present invention;
FIG. 3 is a side view of the flexible membrane and overmold support of the present invention;
FIG. 4 is a schematic view of the structure of the plug and the air nozzle of the present invention;
FIG. 5 is a schematic structural view of a blank;
FIG. 6 is a side view of the blank;
FIG. 7 is a schematic view of the preparation of a green body according to the present invention
Wherein: 10. a green body; 201. a plug head; 2011. a plug body; 2012. a plug cap; 2013. filtering cloth; 202. a soft film; 2021. a square column shaped material cavity; 2022. a cylindrical material cavity; 203. supporting the outer mold; 204. an air extraction nozzle.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described in detail and completely with reference to the accompanying drawings. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the detailed description of the embodiments of the present invention provided below is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention.
In the description of the present invention, it is to be understood that the terms indicating an orientation or positional relationship are based on the orientation or positional relationship shown in the drawings only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the drawings of the present invention, it should be understood that different technical features which are not mutually substituted are shown in the same drawing only for the convenience of simplifying the drawing description and reducing the number of drawings, and the embodiment described with reference to the drawings does not indicate or imply that all the technical features in the drawings are included, and thus the present invention is not to be construed as being limited thereto.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. Reference herein to "first," "second," and similar words, does not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. In the implementation of the present application, "and/or" describes an association relationship of associated objects, which means that there may be three relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In the description of the embodiments of the present application, the meaning of "a plurality" means two or more unless otherwise specified. For example, the plurality of positioning posts refers to two or more positioning posts. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The present invention will be described in detail below.
As shown in figures 1-7 of the drawings,
on the one hand, the high specific gravity tungsten alloy product blank quasi-near net-shape soft die comprises a soft film 202 provided with a charging cavity, a plug head 201 for plugging the charging cavity and an air suction nozzle 204 arranged on the plug head 201; as shown in fig. 2, the charging chamber comprises a square column-shaped material chamber 2021, and a cylindrical material chamber 2022 which is communicated with one end of the square column-shaped material chamber 2021 and is in smooth transition; the plug 201 is located on one side of the square cylindrical material cavity 2021 far away from the cylindrical material cavity 2022.
Generally, aiming at the production and processing of small-size high-specific gravity alloy products, the manufacturing link of a blank body 10 needs to consider the comprehensive factors of the deformation influence of material filling on a soft die structure, the contraction deformation influence of a vacuum degassing method on the structure of the blank body 10, the influence of the product placing form on the appearance deformation in isostatic pressing, the influence of the embedding depth of the mesh number of sintering fillers on the surface of the product on the subsequent processing allowance, the liquid-phase sintering deformation of the product and the like; therefore, it is common practice to make a larger margin of the cylindrical blank 10 in order to ensure the finished dimensions and quality of the final product; the biggest disadvantage is that the material loss is too large.
Aiming at the influence of the existing factors on the machining allowance of the final blank body 10, firstly, a cylindrical soft die is subjected to decrement design to effectively reduce the material loading to a certain range, but considering the square-round combined shape of a finished product, the decrement of a cylindrical bar stock is finally limited by the structure of the cylindrical bar stock; therefore, the adjustment and decrement from a round structure to a square structure are tried, a soft mold with a pure square column structure is designed and manufactured, the structure of a blank body 10 of the soft mold is close to the shape of a final product, and the material loading amount is further reduced; when the decrement of the square column-shaped bar stock is closer to the allowance to be processed of the blank body 10, the decrement cannot be carried out; finally, a quasi-net blank body forming idea is introduced, the square-column-shaped material cavity 2021 and the cylindrical-shaped material cavity 2022 are in smooth transition, a charging cavity which is similar to the shape of a final product is formed, and the material loading amount is effectively reduced; the invention introduces the quasi-near net blank body forming concept, designs the soft film 202, and realizes the decrease of the material loading by 30 percent on the original basis in the whole process.
The invention combines the defect of large material loading of the existing cylindrical soft mold, designs the square-round combined special-shaped soft mold by combining the final shape of the product step by step, realizes the quasi-near net shaping of the blank 10 product in the existing process route, and effectively controls the material consumption of the product.
In some possible embodiments, in order to further solve the problem of high material consumption caused by the fact that the appearance shape of the blank is far from the shape of the product, the blank is effectively prevented from being broken; the curvature radius of the joint of the square cylindrical material cavity 2021 and the cylindrical material cavity 2022 is 6.67-8.33.
In some possible embodiments, the cross-sectional dimension of the square column shaped material chamber 2021 is 23mm by 23 mm; the diameter of the cylindrical material cavity 2022 is 21 mm.
In some possible embodiments, in order to effectively support the flexible membrane, the outer side of the flexible membrane 202 is sleeved with an outer mold support 203.
When materials are filled, the outer die support 203 is sleeved on the outer side of the soft film 202 to support the soft film 202, so that the materials are effectively filled in the filling cavity, and the materials can be tightly inserted.
In some possible embodiments, as shown in fig. 1, the plug head 201 includes a plug body 2011 used in cooperation with the square material cavity 2021, and a plug cap 2012 connected to an end of the plug body 2011 away from the square material cavity 2021; the plug head 201 is provided with a mounting hole penetrating through the plug cap 2012 and the plug body 2011; the suction nozzle 204 is mounted in the mounting hole.
The vacuum degassing method comprises the following steps that a vacuum suction nozzle 204 is arranged on a plug head 201 through a mounting hole, one end of the vacuum suction nozzle 204 is connected with a vacuum tube during vacuum degassing, and a vacuum pumping device is used for vacuumizing a charging cavity;
in some possible embodiments, in order to effectively avoid the problem that the end edge chipping in the demolding stage after pressing affects the machining allowance, as shown in fig. 4, the mounting hole includes a first hole penetrating through the plug cap 2012 and the plug head 2011, and a second hole coaxially connected with the first hole and located at one end of the plug body 2011 far away from the plug cap 2012; a filter cloth 2013 is arranged on the second hole; the filter cloth 2013 is coplanar with one end of the plug body 2011 close to the square cylindrical material cavity.
The diameter of the second hole is larger than that of the first hole.
The mounting holes comprise a first hole and a second hole, wherein the first hole is positioned on the plug body 2011 and the plug cap 2012, the second hole is connected with one end of the first hole, which is far away from the plug cap 2012, and the diameter of the second hole is larger than that of the first hole; the two are coaxially arranged; the filter cloth 2013 is arranged in the hole II and is positioned on one side, far away from the plug cap 2012, of the suction nozzle 204; one side of the filter cloth 2013 far away from the suction nozzle 204 is coplanar with one end of the plug body 2011 far away from the plug cap 2012; compared with the prior art, the size of the filter cloth 2013 is greatly reduced, and the whole plug body 2011 cannot be fully paved on the end face far away from the plug cap 2012; therefore, the problem that machining allowance is influenced by end edge breakage in the demolding stage after pressing is effectively solved.
In some possible embodiments, as shown in fig. 1, the square cylindrical material chamber 2021, the cylindrical material chamber 2022, and the mounting hole are coaxially arranged.
In some possible embodiments, as shown in fig. 1 and 2, the outer side of the soft membrane 202 is provided with an annular boss cooperating with the plug cap 2012.
The soft film in the invention is combined with the final shape of the blank body to realize the quasi-near net shaping of the blank body product in the existing process route, and the material consumption of the product is effectively controlled.
A preparation method of a high specific gravity tungsten alloy product blank specifically comprises the following steps:
step S1, material charging; loading materials by relying on the soft mold and the outer mold support 203;
step S2, vacuum degassing; on the premise of ensuring that the vacuum degassing time of the blank 10 in the soft mold is enough, transferring the blank from the charging position to a product to be degassed in the link, and strictly forbidding to remove the outer support aluminum mold; and the soft mold cavity is required to be vertically placed in a special turnover box for limiting, then the air suction nozzle 204 is connected with a vacuum pipeline, and the soft mold cavity is slowly vacuumized in the degassing initial stage.
The vacuum degassing time is 1-2 hours.
Step S3, isostatic pressing; when the vacuum degassing of the product is finished, the external mold supports 203 are removed one by one, and then the product is transferred to an isostatic pressing station, wherein the fracture influence on the blank body 10 caused by vibration and collision needs to be noticed in the process; before pressing, the soft molded product is hung on a corresponding hanger or directly hung in a special turnover box and then integrally placed in a cylinder for pressing. The method specifically comprises the following steps:
step S31, removing the outer mold supports 203 one by one before isostatic pressing;
step S32: hoisting the soft film 202 product on a lifting appliance or in a suspension and turnover box;
step S33: isostatic pressing; the pressing pressure was 150 MP.
Step S4, liquid phase sintering; after the pressed compact is transferred to a sintering position, the appearance quality of the green body 10 needs to be checked before being loaded into a boat, products with insufficient subsequent machining allowance due to collision and edge and corner dropping are removed, and the influence of the embedding depth of the filler mesh number on the surfaces of the products on the subsequent milling amount is fully considered in the liquid phase sintering process. The sintering temperature is 1540 ℃, and the mesh number of the filler is 80 meshes.
And step S5, obtaining the sintered blank 10 to be finished.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (9)
1. A high specific gravity tungsten alloy product blank quasi-near net-shape soft die mould is characterized by comprising a soft film provided with a charging cavity, a plug head used for plugging the charging cavity and an air suction nozzle arranged on the plug head; the charging cavity comprises a square column-shaped material cavity and a cylindrical material cavity which is communicated with one end of the square column-shaped material cavity and is in smooth transition; the plug is located the side that cylindrical material chamber was kept away from to square column shape material chamber.
2. The near-net shape soft die mold for the high specific gravity tungsten alloy product blank according to claim 1, wherein the radius of curvature of the joint of the square material cavity and the cylindrical material cavity is 6.67-8.33.
3. The near-net shape soft die mold for the high specific gravity tungsten alloy product blank according to claim 1, wherein the square cylindrical material cavity has a cross-sectional dimension of 23mm by 23 mm; the diameter of the cylindrical material cavity is 21 mm.
4. The near-net shape soft mold for the high specific gravity tungsten alloy article blank according to claim 1, further comprising an outer mold support sleeved outside the soft film.
5. The near-net shape soft die mold for the high specific gravity tungsten alloy product blank according to claim 1, wherein the plug head comprises a plug body used for matching with the square cylindrical material cavity, and a plug cap connected with one end of the plug body far away from the square cylindrical material cavity; the plug head is provided with a mounting hole penetrating through the plug cap and the plug body; the air suction nozzle is installed in the installation hole.
6. The near net shape soft die mold for the high specific gravity tungsten alloy article blank according to claim 5, wherein the mounting hole comprises a first hole penetrating through the plug cap and the plug head, and a second hole coaxially connected with the first hole and positioned at one end of the plug body far away from the plug cap; filter cloth is arranged on the second hole; the filter cloth and one end of the plug body close to the square cylindrical material cavity are coplanar.
7. The near-net shape soft die mold for the high specific gravity tungsten alloy article blank according to claim 6, wherein the diameter of the second hole is larger than the diameter of the first hole.
8. The near-net-shape soft die for the high specific gravity tungsten alloy product blank according to any one of claims 5 to 7, wherein the square cylindrical material cavity, the cylindrical material cavity and the mounting hole are coaxially arranged.
9. The near-net shape soft die mold for the high specific gravity tungsten alloy product blank according to claim 8, wherein the outer side of the soft film is provided with an annular boss used with the plug cap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110284500.2A CN113182517A (en) | 2021-03-17 | 2021-03-17 | Quasi-near net-shape soft die for high-specific-weight tungsten alloy product blank |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110284500.2A CN113182517A (en) | 2021-03-17 | 2021-03-17 | Quasi-near net-shape soft die for high-specific-weight tungsten alloy product blank |
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