CN110893463A - Pressing die for hard alloy long rod with holes - Google Patents
Pressing die for hard alloy long rod with holes Download PDFInfo
- Publication number
- CN110893463A CN110893463A CN201911258996.5A CN201911258996A CN110893463A CN 110893463 A CN110893463 A CN 110893463A CN 201911258996 A CN201911258996 A CN 201911258996A CN 110893463 A CN110893463 A CN 110893463A
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- China
- Prior art keywords
- sleeve
- perforated
- core rod
- steel sleeve
- pressing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000003825 pressing Methods 0.000 title claims abstract description 54
- 239000000956 alloy Substances 0.000 title claims abstract description 22
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 22
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 95
- 239000010959 steel Substances 0.000 claims abstract description 95
- 238000007789 sealing Methods 0.000 claims abstract description 47
- 230000007704 transition Effects 0.000 claims description 3
- 230000008602 contraction Effects 0.000 abstract description 2
- 230000000149 penetrating effect Effects 0.000 abstract description 2
- 239000000843 powder Substances 0.000 description 8
- 238000009694 cold isostatic pressing Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 238000000462 isostatic pressing Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000004520 electroporation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000009704 powder extrusion Methods 0.000 description 2
- DOQPXTMNIUCOSY-UHFFFAOYSA-N [4-cyano-4-(3,4-dimethoxyphenyl)-5-methylhexyl]-[2-(3,4-dimethoxyphenyl)ethyl]-methylazanium;chloride Chemical compound [H+].[Cl-].C1=C(OC)C(OC)=CC=C1CCN(C)CCCC(C#N)(C(C)C)C1=CC=C(OC)C(OC)=C1 DOQPXTMNIUCOSY-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229940116800 covera Drugs 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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]
-
- 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
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Package Frames And Binding Bands (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention discloses a pressing die for a long hard alloy rod with a hole, which is characterized in that: the device comprises a tubular rubber sleeve and a core rod arranged in the tubular rubber sleeve, wherein a die cavity is formed between the tubular rubber sleeve and the core rod, and sealing elements for sealing the die cavity are arranged at two ends of the tubular rubber sleeve; the tubular rubber sleeve is externally provided with a perforated steel sleeve, two ends of the core rod penetrate through the sealing element and extend out of the perforated steel sleeve, external threads are arranged at two ends of the core rod penetrating out of the perforated steel sleeve respectively, the external threads at two ends are connected with a thread pressing sleeve in a matched mode, and the thread pressing sleeve is used for limiting the core rod by rotating and pressing the perforated steel sleeve. The invention aims to provide a pressing die for a long hard alloy perforated rod, which is used for ensuring that a core rod is not bent due to limited expansion and contraction when being pressed and stressed and ensures smooth demoulding.
Description
Technical Field
The invention relates to the technical field of cold isostatic pressing forming dies, in particular to a pressing die for a long hard alloy bar with holes.
Background
The prior method for producing the hard alloy long rod with the hole comprises the following steps: powder extrusion, dry bag isostatic pressing, wet bag cold isostatic pressing, post-sintering electroporation, and the like. Each method has certain limitations. Products with large cross-sectional areas are influenced by the tonnage of an extruder, a die and the like, and powder extrusion cannot be produced; dry bag isostatic presses suitable for the production of products with large cross-sectional areas (diameter greater than 130mm) and long lengths (greater than 530mm) have not been available due to the limitations of various conditions; electroporation is suitable for smaller pore size products, and the depth is limited, and the processing time is long and the cost is high.
The cold isostatic pressing is to apply pressure to the mold after powder filling. For the production of long rods with holes, the situations of slightly uneven powder filling, slightly irregular core rods, slightly uneven powder filling soft film wall thickness, freeness of the core rods in the length direction and the like occur, and when the long rods are subjected to isostatic pressing, the core rods are bent and cannot be demoulded, so that the product forming cannot be finished.
Disclosure of Invention
Aiming at the existing defects, the invention aims to provide a pressing die for a hard alloy long rod with a hole, which has the advantages that the core rod is limited in expansion and contraction and cannot be bent when being pressed and stressed, and smooth demoulding is ensured.
The technical scheme of the invention is as follows:
a pressing die for a long hard alloy rod with a hole comprises a tubular rubber sleeve and a core rod arranged in the tubular rubber sleeve, wherein a die cavity is formed between the tubular rubber sleeve and the core rod, and sealing elements used for sealing the die cavity are arranged at two ends of the core rod in the tubular rubber sleeve; the tubular rubber sleeve is sleeved with a steel sleeve with a hole, and two ends of the steel sleeve with the hole are provided with openings; the two ends of the core rod extend out of the openings at the two ends of the steel sleeve with holes, external threads are arranged at the two ends of the core rod penetrating out of the steel sleeve with holes respectively, the external threads at the two ends are connected with thread pressing sleeves in a matched mode, and the thread pressing sleeves can tightly press the end portions of the steel sleeve with holes through rotation to limit the core rod.
The perforated steel sleeve comprises a first perforated steel sleeve and two second perforated steel sleeves, the first perforated steel sleeve is arranged outside the tubular rubber sleeve, the second perforated steel sleeve is detachably connected to two ends of the first perforated steel sleeve, and the end part of the second perforated steel sleeve is provided with the opening; the two ends of the tubular rubber sleeve extend into the second steel sleeve with the holes respectively, the two ends of the tubular rubber sleeve extending into the second steel sleeve with the holes are provided with the sealing elements used for sealing the die cavity, and the two ends of the core rod extend out of the opening of the second steel sleeve with the holes.
Specifically, the opening is a limiting hole coaxial with the core rod, a limiting pipe which is matched with the aperture of the limiting hole and coaxial with the aperture of the limiting hole is arranged on the thread pressing sleeve, the core rod penetrates through the limiting pipe to be connected with the thread pressing sleeve, and the limiting pipe can be inserted into the limiting hole through the rotation of the thread pressing sleeve to perform secondary limiting on the core rod.
Specifically, a sealing gasket is arranged between the second steel sleeve with the hole and the threaded pressing sleeve.
Specifically, the external thread extends into the second steel sleeve with holes, and a tightening nut used for compressing the sealing element is further arranged on the external thread in the second steel sleeve with holes.
Specifically, the sealing member includes transition cushion, steel pad and the sealed cushion that sets gradually along plug tip direction.
Specifically, a sealing ring is arranged between the sealing rubber gasket and the steel gasket.
Specifically, a limiting table is arranged on the core rod in the second steel sleeve with holes and is in contact limiting with the steel pad.
Specifically, a tightening piece is arranged on the tubular rubber sleeve positioned outside the sealing rubber gasket.
Specifically, the limiting pipe is connected with the limiting hole in a clearance fit mode.
The invention has the beneficial effects that:
1. the pressing die adopts threads processed at two ends of the core rod, the steel sleeve with holes and the core rod are connected and fixed through the thread pressing sleeve, and the core rod is tightly pulled, the steel sleeve with holes plays a role in supporting and limiting, so that the core rod is limited in expansion and cannot be bent when being pressed and stressed, and the core rod is smoothly released from a pressed blank after pressing is finished, and a pressing task is completed;
2. the first steel sleeve with the hole and the two second steel sleeves with the hole are arranged, the second steel sleeves with the hole are more convenient to disassemble at two ends, and the second steel sleeves with the hole, which have high requirements on precision control, are separately processed after the steel sleeves with the hole are separated, so that the second steel sleeves with the holes are higher in precision control cost efficiency;
3. the limiting pipe arranged on the threaded pressing sleeve is matched with the limiting hole of the core rod, so that the core rod can be limited for the second time, and the core rod can be smoothly released from a pressed blank after the pressing task is finished;
4. the invention seals the ring at the joint of the steel pad and the core rod, and prevents the quality of the pressed blank from being affected by liquid seepage from the joint when the steel pad and the core rod are pressurized by cold isostatic pressing.
Drawings
FIG. 1 is a schematic structural diagram of a pressing die for a long hard alloy perforated rod according to the present invention.
In the figure, 1-mandrel, 2-tubular rubber sleeve, 301-transition rubber pad, 302-steel pad, 303-sealing rubber pad, 401-first perforated steel sleeve, 402-second perforated steel sleeve, 5-external thread, 6-threaded press sleeve, 7-limiting tube, 8-limiting hole, 9-sealing gasket, 10-tightening nut, 11-sealing ring and 12-clamping piece.
Detailed Description
In order to explain the technical content, the achieved objects and the effects of the present invention in detail, the following description is made in conjunction with the embodiments and the accompanying drawings.
A pressing die of a long hard alloy perforated rod shown in figure 1 for preparing
Outer cover
A hard alloy perforated long rod with the inner diameter of 19.2 multiplied by 885 mm.
The pressing die comprises a tubular rubber sleeve 2 and a core rod 1 which is arranged in the tubular rubber sleeve 2, a tubular die cavity is formed between the tubular rubber sleeve 2 and the core rod 1, and sealing elements for sealing the die cavity are arranged at two ends of the core rod 1 which is positioned in the tubular rubber sleeve 2; a perforated steel sleeve is sleeved outside the tubular rubber sleeve 2, and openings are arranged at two ends of the perforated steel sleeve; outside the opening at foraminiferous steel bushing both ends was stretched out at 1 both ends of plug, 1 both ends of plug that wear out the foraminiferous steel bushing are provided with external screw thread 5 respectively, and the cooperation is connected with screw thread pressure cover 6 on the external screw thread 5 at both ends, and screw thread pressure cover 6 can compress tightly the tip of foraminiferous steel bushing through the rotation, and is spacing to plug 1.
The working principle of the invention is as follows: firstly, a core rod 1 is placed in a tubular rubber sleeve 2, a sealing element is arranged at one end of the core rod 1, then a steel sleeve with holes is sleeved outside the tubular rubber sleeve 2, the core rod 1 at one end of the sealing element is arranged to penetrate through the steel sleeve with the holes, and a threaded pressing sleeve is used for pressing and fixing; then, hard alloy powder is filled into a tubular die cavity formed between the tubular rubber sleeve 2 and the core rod 1, the powder is compacted uniformly after being filled, the top of the powder is paved, a sealing element is arranged on the core rod 1 at the top, the tubular rubber sleeve 2, the sealing rubber pad 303 and the core rod 1 are clamped by the clamping element 12 to seal the whole tubular die cavity, and at the moment, a complete sealing body is formed inside the tubular rubber sleeve 2; finally, the threaded pressing sleeve on the top is assembled with the other end of the steel sleeve with the hole to tightly press the die, and the whole die is placed into an isostatic pressing frame of a special isostatic cool pressing machine to carry out isostatic cool pressing operation. In the cold isostatic pressing operation process, pressure media in the cold isostatic pressing machine enter the steel sleeve 4 from the hole of the steel sleeve 4 during molding, and the molding cavity is reliably sealed by the sealing pieces at the two ends, so that the influence of mold water inflow on the molding process of powder is well avoided; the pressure medium enables the tubular rubber sleeve 2 to extrude the alloy powder, so that the pressure can be applied to the whole surface of the product in a balanced manner, and the product is molded uniformly; in the pressing process, because the threads M16 are processed at the two ends of the core rod 1, the core rod 1 is fixedly connected and tightly drawn through the thread pressing sleeve 6, and the steel sleeve 4 with the holes plays a role in supporting and limiting, so that the core rod 1 is limited in expansion and cannot be bent when being pressed and stressed. After the pressing process is finished, the thread pressing sleeve and the sealing piece at the top are sequentially disassembled, the core rod 1 is fixedly connected and pulled out due to the thread pressing sleeve 6, the deformation is small or not deformed, the pressing task can be finished, the core rod can be smoothly separated from the pressed blank, and the next step of processing is carried out.
As a preferred scheme of this embodiment, the perforated steel sleeve 4 includes a first perforated steel sleeve 401 and a second perforated steel sleeve 402, the first perforated steel sleeve 401 is arranged outside the tubular rubber sleeve 2, two ends of the first perforated steel sleeve 401 are detachably connected with the second perforated steel sleeve 402, two ends of the tubular rubber sleeve 2 respectively extend into the second perforated steel sleeve 402, two ends of the tubular rubber sleeve 2 extending into the second perforated steel sleeve 402 are provided with a sealing member 3 for sealing a cavity, and two ends of the mandrel 1 penetrate through the sealing member 3 and extend out of the second perforated steel sleeve 402. The arrangement of the first perforated steel sleeve 401 and the two second perforated steel sleeves 402 has the effects that the second perforated steel sleeves 402 are more convenient for the disassembly work of the two ends, the perforated steel sleeves are separated, the second perforated steel sleeves 402 with high requirements on precision control are separately processed, and the second perforated steel sleeves 402 are higher in the aspect of the cost efficiency of precision control;
as a preferable mode of the present embodiment, the end of the second steel bushing with holes 402 is provided with a stopper hole 8 coaxial with the mandrel 1, and the stopper hole 8 is larger than the diameter of the mandrel 1; the threaded pressing sleeve 6 is provided with a limiting pipe 7 matched with the aperture of the limiting hole 8, the limiting pipe 7 is connected with the limiting hole 8 in a clearance fit mode, the limiting pipe 7 is connected with the limiting hole 8 to limit the core rod 1 for the second time, the higher limiting requirement is met, and the core rod 1 can finish the pressing task and smoothly deviate from a pressed blank.
In a preferred embodiment of the present embodiment, a sealing gasket 9 for sealing is provided between the second steel sleeve with holes 402 and the threaded press sleeve 6.
In a preferred embodiment of the present invention, the male thread 5 extends into the second steel bush 402, and the tightening nut 10 for pressing the seal 3 is further provided on the male thread 5 in the second steel bush 402, so that only one long male thread 5 is required to be machined at each end of the mandrel bar, thereby reducing the number of steps.
As a preferable scheme of the present embodiment, the sealing member 3 includes a transition rubber pad 301, a steel pad 302, and a sealing rubber pad 303, which are sequentially arranged along the end direction of the mandrel 1; a sealing ring 11 is arranged between the sealing rubber gasket 303 and the steel gasket 302.
As a preferable scheme of this embodiment, the mandrel 1 in the second steel bushing with a hole 402 is provided with a limiting table, the limiting table is in contact with the steel pad 302 for limiting, and the limiting table can play a role in controlling the size of the cavity.
As a preferable solution of this embodiment, the fastening member 12 is disposed on the tubular rubber sleeve 2 outside the sealing rubber pad 303, which further increases the sealing performance.
In a preferred embodiment of the present invention, the limiting tube 7 is connected to the limiting hole 8 in a clearance fit manner, so that the mandrel bar 1 has better adjustability.
Although the invention has been described in detail above with reference to specific embodiments, it will be apparent to one skilled in the art that modifications or improvements may be made based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. The utility model provides a compacting tool set of foraminiferous long rod of carbide which characterized in that: the device comprises a tubular rubber sleeve (2) and a core rod (1) arranged in the tubular rubber sleeve (2), wherein a die cavity is formed between the tubular rubber sleeve (2) and the core rod (1), and sealing elements for sealing the die cavity are arranged at two ends of the core rod (1) positioned in the tubular rubber sleeve (2); a perforated steel sleeve is sleeved outside the tubular rubber sleeve (2), and openings are formed in two ends of the perforated steel sleeve; the two ends of the core rod (1) extend out of the openings at the two ends of the perforated steel sleeve, the two ends of the core rod (1) which penetrate out of the perforated steel sleeve are respectively provided with external threads (5), the external threads (5) at the two ends are connected with a thread pressing sleeve (6) in a matched mode, and the thread pressing sleeve (6) can compress the end portion of the perforated steel sleeve through rotation.
2. The pressing die for the long hard alloy perforated rod as claimed in claim 1, wherein: the perforated steel sleeve comprises a first perforated steel sleeve (401) and two second perforated steel sleeves (402), the first perforated steel sleeve (401) is arranged outside the tubular rubber sleeve (2), the second perforated steel sleeve (402) is detachably connected to two ends of the first perforated steel sleeve (401), and the end part of the second perforated steel sleeve (402) is provided with the opening; the two ends of the tubular rubber sleeve (2) respectively extend into the second steel sleeve with the holes (402), the sealing elements used for sealing the die cavity are arranged at the two ends of the tubular rubber sleeve (2) extending into the second steel sleeve with the holes (402), and the two ends of the core rod (1) extend out of the opening of the second steel sleeve with the holes (402).
3. The pressing die for the long hard alloy perforated rod as claimed in claim 2, wherein: the opening is a limiting hole (8) coaxial with the core rod (1), a limiting pipe (7) which is matched with the aperture of the limiting hole (8) and coaxial with the aperture of the limiting hole (8) is arranged on the thread pressing sleeve (6), the core rod (1) penetrates through the limiting pipe (7) to be connected with the thread pressing sleeve (6), and the limiting pipe (7) can be inserted into the limiting hole (8) through the rotation of the thread pressing sleeve (6).
4. The pressing die for the long hard alloy perforated rod as claimed in claim 2, wherein: and a sealing gasket (9) is arranged between the second steel sleeve with the hole (402) and the threaded pressing sleeve (6).
5. The pressing die for the long hard alloy perforated rod as claimed in claim 2, wherein: the external thread (5) extends into the second steel sleeve with the hole (402), and a tightening nut (10) used for compressing the sealing element (3) is further arranged on the external thread (5) in the second steel sleeve with the hole (402).
6. The pressing die for the long hard alloy perforated rod as claimed in claim 1 or 2, wherein: the sealing element comprises a transition rubber mat (301), a steel mat (302) and a sealing rubber mat (303) which are sequentially arranged along the end part direction of the core rod (1).
7. The pressing die for the long hard alloy perforated rod as claimed in claim 6, wherein: and a sealing ring (11) is arranged between the sealing rubber gasket (303) and the steel gasket (302).
8. The pressing die for the long hard alloy perforated rod as claimed in claim 6, wherein: and a limiting table is arranged on the mandrel (1) in the second steel sleeve with the hole (402), and the limiting table is in contact limiting with the steel pad (302).
9. The pressing die for the long hard alloy perforated rod as claimed in claim 6, wherein: a clamping piece (12) is arranged on the tubular rubber sleeve (2) positioned outside the sealing rubber gasket (303).
10. The pressing die for the long hard alloy perforated rod as claimed in claim 3, wherein: the limiting pipe (7) is connected with the limiting hole (8) in a clearance fit mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911258996.5A CN110893463B (en) | 2019-12-10 | 2019-12-10 | Pressing die for hard alloy belt Kong Changbang |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911258996.5A CN110893463B (en) | 2019-12-10 | 2019-12-10 | Pressing die for hard alloy belt Kong Changbang |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110893463A true CN110893463A (en) | 2020-03-20 |
| CN110893463B CN110893463B (en) | 2024-07-02 |
Family
ID=69787456
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911258996.5A Active CN110893463B (en) | 2019-12-10 | 2019-12-10 | Pressing die for hard alloy belt Kong Changbang |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110893463B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2406780A1 (en) * | 1973-03-07 | 1974-09-12 | Asea Ab | METHOD OF HYDROSTATIC EXTRUSION |
| KR200186048Y1 (en) * | 1999-12-23 | 2000-06-15 | 포항종합제철주식회사 | Mandrel with sleeve improved strip absorption power |
| CN201020537Y (en) * | 2007-05-18 | 2008-02-13 | 西北有色金属研究院 | Cold isostatic moulding die for producing sintering powder filtering tube |
| CN103112195A (en) * | 2013-01-31 | 2013-05-22 | 成都易态科技有限公司 | Isostatic pressing filter element molding die and end sealing elements thereof |
| CN211708102U (en) * | 2019-12-10 | 2020-10-20 | 广西梧州港德硬质合金制造有限公司 | Pressing die for hard alloy long rod with holes |
-
2019
- 2019-12-10 CN CN201911258996.5A patent/CN110893463B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2406780A1 (en) * | 1973-03-07 | 1974-09-12 | Asea Ab | METHOD OF HYDROSTATIC EXTRUSION |
| KR200186048Y1 (en) * | 1999-12-23 | 2000-06-15 | 포항종합제철주식회사 | Mandrel with sleeve improved strip absorption power |
| CN201020537Y (en) * | 2007-05-18 | 2008-02-13 | 西北有色金属研究院 | Cold isostatic moulding die for producing sintering powder filtering tube |
| CN103112195A (en) * | 2013-01-31 | 2013-05-22 | 成都易态科技有限公司 | Isostatic pressing filter element molding die and end sealing elements thereof |
| CN211708102U (en) * | 2019-12-10 | 2020-10-20 | 广西梧州港德硬质合金制造有限公司 | Pressing die for hard alloy long rod with holes |
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| Publication number | Publication date |
|---|---|
| CN110893463B (en) | 2024-07-02 |
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