CN113878085B - Hollow plunger forging of high-pressure plunger pump and one-step forming process and die thereof - Google Patents
Hollow plunger forging of high-pressure plunger pump and one-step forming process and die thereof Download PDFInfo
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- CN113878085B CN113878085B CN202111169227.5A CN202111169227A CN113878085B CN 113878085 B CN113878085 B CN 113878085B CN 202111169227 A CN202111169227 A CN 202111169227A CN 113878085 B CN113878085 B CN 113878085B
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- 238000005242 forging Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 238000001125 extrusion Methods 0.000 claims description 70
- 238000000641 cold extrusion Methods 0.000 claims description 19
- 238000005422 blasting Methods 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 9
- 239000000314 lubricant Substances 0.000 claims description 7
- 238000005461 lubrication Methods 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 claims description 4
- 229910052982 molybdenum disulfide Inorganic materials 0.000 claims description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims description 4
- 239000011574 phosphorus Substances 0.000 claims description 4
- 238000007127 saponification reaction Methods 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 238000005240 physical vapour deposition Methods 0.000 claims 2
- 239000002994 raw material Substances 0.000 abstract description 3
- 238000005520 cutting process Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000005266 casting Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000010273 cold forging Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K3/00—Making engine or like machine parts not covered by sub-groups of B21K1/00; Making propellers or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/02—Dies or mountings therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/08—Accessories for handling work or tools
- B21J13/14—Ejecting devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J3/00—Lubricating during forging or pressing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
- B21J5/025—Closed die forging
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/14—Pistons, piston-rods or piston-rod connections
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Forging (AREA)
Abstract
The invention relates to the technical field of high-pressure plunger pump hollow plunger forgings, in particular to a high-pressure plunger pump hollow plunger forgings, which comprises an outer shell and a middle bulge integrally connected with the outer shell, wherein the outer shell comprises an outer contour surface, an annular upper end surface, a lower end surface and a first inner contour surface; the invention also provides a process and a die for manufacturing the forging, the hollow plunger forging is easy to cold forge and form, the deep hole is not required to be cut, raw materials are saved, and the product manufacturing efficiency is improved.
Description
Technical Field
The invention relates to the technical field of high-pressure plunger pump hollow plunger forgings, in particular to a high-pressure plunger pump hollow plunger forgings and a one-step forming process and a one-step forming die thereof.
Background
The existing plunger part for the high-pressure plunger pump is high in mechanical property requirement and provided with a closed cavity, the prior art is generally formed by welding two plunger structural members, one plunger structural member is provided with a deep annular deep cavity, and the plunger structural member is obtained after deep hole cutting is performed by using bar stock. In order to further improve the production efficiency and reduce the material loss, the prior art considers that the forging or casting technology is adopted to perform the partial cutting processing on the plunger structural member with the deep and narrow cavity after the prefabricated blank, but the mechanical property of the part adopting the casting technology cannot meet the requirement, and only the forging technology can be adopted. Further deriving presents the problem that the existing forging processes are generally divided into warm forging and cold forging, the warm forging material and energy consumption is high and additional demoulding structure and ejection structure are required to be arranged, while cold forging is generally only applicable to cup-shaped hollow pieces, and the height-diameter ratio requirement for the cup-shaped inner holes is not more than 3. The plunger structure generally has no demoulding inclination, and the hollow part is generally an annular hole with the height-to-diameter ratio larger than 3, so that the plunger structure with the annular deep hole cavity is difficult to obtain by adopting a forging process, and is generally considered to be infeasible by a person skilled in the art.
Disclosure of Invention
The invention aims to solve the technical problems that: the invention provides a hollow plunger forging piece of a high-pressure plunger pump, a one-step forming process and a one-step forming die thereof, which are used for solving the problems of raw material waste and lower manufacturing efficiency of the conventional forging process.
The technical scheme adopted for solving the technical problems is as follows:
The utility model provides a high-pressure plunger pump cavity plunger forging, includes the outside casing and with the middle arch of outside casing body coupling, the outside casing includes outline face, annular up end, lower terminal surface and first interior profile, the middle arch includes circular up end and second interior profile, first interior profile, second interior profile reaches the terminal surface constitutes annular deep hole die cavity jointly, the ratio of annular deep hole die cavity's altitude value and diameter value is greater than 3, the bellied altitude value in middle is greater than annular deep hole die cavity's altitude value.
Specifically, the first inner contour surface, the second inner contour surface and the lower end surface are all mold forming surfaces, and the outer contour surface of the outer shell is designed with a forward extrusion cone angle which is 79-81 degrees.
A forming process for manufacturing the hollow plunger forging of the high-pressure plunger pump comprises the following steps of,
(1) The blanking is carried out to obtain a blank P1,
(2) Performing surface shot blasting treatment on the blank P1 by adopting a shot blasting machine to obtain a shot-blasted blank P2,
(3) Carrying out surface lubrication treatment on the shot-blasting blank P2 to obtain a lubricated blank P3,
(4) And (3) cold extrusion, namely forming the lubricated blank P3 in the step (3) on cold extrusion equipment by adopting a cold extrusion die M to obtain a hollow plunger forging, wherein the upper end surface of the blank P3 is required to be coated with lubricant during forming.
Specifically, the blanking method in the step (1) is to saw the round bar material by using a sawing machine.
Specifically, the diameter of the shot blasting steel shot in the step (2) is phi 0.6 mm-phi 1.2mm.
Specifically, the surface lubrication treatment in the step (3) specifically includes performing surface phosphorus saponification treatment on the shot-blasted blank P2 to reduce the pressure during subsequent cold extrusion molding.
Specifically, the lubricant coated on the upper end face of the blank P3 in the step (4) is a mixture of molybdenum disulfide and lard.
The cold extrusion die M is a combined female die and comprises a jacking rod, an extrusion lower die core, an extrusion lower die middle layer stress ring, an extrusion lower die outer layer stress ring, an extrusion upper die core, an extrusion upper die sleeve and an extrusion upper die cushion block.
Further, the surfaces of the extrusion upper die core and the extrusion lower die core cavity need to be coated with PVD coatings.
Further, the extrusion lower die core is provided with a back taper part, the extrusion lower die core is further provided with a die orifice guiding part for improving the forming coaxiality of products, and the outer circular surface and the middle hole surface of the extrusion upper die core are both provided with a working belt part for reducing friction and forming pressure.
The beneficial effects of the invention are as follows: (1) The hollow plunger forging is easy to cold forge and form, and deep holes do not need to be cut, so that raw materials are saved, and the manufacturing efficiency of products is improved; (2) Compared with the cutting processing, the mechanical property of the hollow plunger forging is higher and more stable, the compactness of the product is good, and casting defects such as air holes are avoided.
Drawings
The invention will be further described with reference to the drawings and examples.
FIG. 1 is a block diagram of a hollow plunger of a high pressure plunger pump of the present invention;
FIG. 2 is a schematic view of an annular deep hole cavity plunger structural member of the present invention;
FIG. 3 is a block diagram of a hollow plunger forging of the present invention;
FIG. 4 is a block diagram of a preform of the present invention;
FIG. 5 is a diagram of the structure of the shot blasting blank of the present invention;
FIG. 6 is a block diagram of a lubricated preform according to the present invention;
Fig. 7 is a structural view of a cold extrusion die of the present invention.
In the figure, an outer shell, a middle bulge, an extrusion upper die core, an extrusion lower die outer layer stress ring, an extrusion lower die middle layer stress ring, an extrusion lower die core, an extrusion lower die ejector rod, an extrusion upper die cushion block, an extrusion upper die sleeve, an outer contour surface, an annular upper end surface, a lower end surface, a first inner contour surface, a round upper end surface and a second inner contour surface, wherein the outer shell is 1, the middle bulge, the extrusion upper die core, the extrusion lower die outer layer stress ring, the extrusion lower die middle layer stress ring, the extrusion lower die core, the extrusion lower die ejector rod, the extrusion upper die cushion block, the extrusion upper die sleeve, the outer contour surface, the annular upper end surface, the lower end surface, the first inner contour surface, the round upper end surface and the second inner contour surface are respectively.
Detailed Description
The invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic representations which merely illustrate the basic structure of the invention and therefore show only the structures which are relevant to the invention.
As shown in FIG. 3, the hollow plunger forging of the high-pressure plunger pump comprises an outer shell 1 and a middle bulge 2 integrally connected with the outer shell 1, wherein the outer shell 1 comprises an outer contour surface, an annular upper end surface, a lower end surface and a first inner contour surface, the middle bulge 2 comprises a circular upper end surface and a second inner contour surface, the first inner contour surface, the second inner contour surface and the lower end surface jointly form an annular deep hole cavity, the ratio of the height value and the diameter value of the annular deep hole cavity is greater than 3, the height value of the middle bulge 2 is greater than the height value of the annular deep hole cavity, the first inner contour surface, the second inner contour surface and the lower end surface are all mold forming surfaces, and the outer contour surface of the outer shell 1 is designed with a forward extrusion cone angle of 79-81 degrees.
A forming process for manufacturing the hollow plunger forging of the high-pressure plunger pump comprises the following steps of:
(1) The blanking is carried out to obtain a blank P1,
(2) Performing surface shot blasting treatment on the blank P1 by adopting a shot blasting machine to obtain a shot-blasted blank P2,
(3) Carrying out surface lubrication treatment on the shot-blasting blank P2 to obtain a lubricated blank P3,
(4) And (3) cold extrusion, namely forming the lubricated blank P3 in the step (3) on cold extrusion equipment by adopting a cold extrusion die M to obtain a hollow plunger forging, wherein the upper end surface of the blank P3 is required to be coated with lubricant during forming.
The blanking method in the step (1) is to saw the round bar material by a sawing machine.
The diameter of the shot blasting steel shot in the step (2) is phi 0.6 mm-phi 1.2mm.
The specific process of the surface lubrication treatment in the step (3) is to carry out surface phosphorus saponification treatment on the shot-blasted blank P2 so as to reduce the pressure during the subsequent cold extrusion forming.
The lubricant coated on the upper end face of the blank P3 in the step (4) is a mixture of molybdenum disulfide and lard.
The cold extrusion die M is a combined female die and comprises an extrusion lower die ejector rod 7, an extrusion lower die core 6, an extrusion lower die middle layer stress ring 5 and an extrusion lower die outer layer stress ring 4, an extrusion upper die core 3, an extrusion upper die sleeve 9 and an extrusion upper die cushion block 8, PVD coatings are required to be coated on the cavity surfaces of the extrusion upper die core 3 and the extrusion lower die core 6, the extrusion lower die core 6 is provided with a back taper part, the extrusion lower die core 6 is also provided with a die orifice guide part for improving the forming coaxiality of products, and the outer circular surface and the middle hole surface of the extrusion upper die core 3 are both provided with working belt parts for reducing friction and forming pressure.
The utility model provides a material is annular deep hole die cavity plunger structure (as shown in fig. 2) of 31CrMoV9, adopt plunger forging cutting process to obtain, the structure of plunger forging (as shown in fig. 3), this plunger forging contains outer casing 1 and with outer casing body coupling's middle arch 2, outer casing contains outline face 11, annular up end 12, lower terminal surface 13 and first interior profile face 14, and outer casing body coupling's middle arch 2 still contains circular up end 21 and second interior profile face 22, first interior profile face 14, second interior profile face 22 and lower terminal surface 13 constitute annular deep hole die cavity jointly, the ratio of the high value of annular deep hole die cavity and diameter value is greater than 3, the high value of middle arch 2 is greater than annular deep hole die cavity's high value. The first inner contour surface 14, the second inner contour surface 22, and the lower end surface 13 are all mold-formed surfaces, and no cutting process is performed during the plunger manufacturing process. The outer contour surface of the outer shell 1 is designed with a forward extrusion cone angle of 79-81 degrees. A forming process for preparing the plunger forging comprises the following steps:
(1) The round bar material is cut into blanks with certain lengths by adopting a circular saw (as shown in figure 4), and the lengths of the blanks are converted according to the volume of the plunger forging by adopting an equal volume principle.
(2) The shot blasting treatment is carried out on the blank shown in the figure 4 by adopting a shot blasting machine to obtain a shot-blasted blank (shown in figure 5), wherein the diameter of the shot-blasted steel shot is phi 0.6 mm-phi 1.2mm, and preferably phi 0.8mm.
(3) And (3) performing all surface phosphorus saponification treatment on the shot-blasted blank, and additionally coating a lubricant composed of a mixture of molybdenum disulfide and lard on the upper end surface of the shot-blasted blank to obtain the surface-lubricated blank (shown in figure 6).
(4) The material blank with the lubricated surface is placed into a cold extrusion die on cold extrusion equipment for forming, and the cold extrusion die comprises an extrusion lower die ejector rod 7, an extrusion lower die core 6, an extrusion lower die middle layer stress ring 5, an extrusion lower die outer layer stress ring 4, an extrusion upper die core 3, an extrusion upper die sleeve 9 and an extrusion upper die cushion block 8. The surfaces of the cavities of the upper extrusion die core 3 and the lower extrusion die core 6 need to be coated with PVD coatings. The extrusion lower die core 6 is provided with a back taper part to prevent products from remaining on the extrusion upper die (the upper die of the oil press is not ejected), and meanwhile, a stripper plate can be omitted.
In a preferred embodiment, the extrusion lower die core 6 is also provided with a die orifice guide to improve the coaxiality of the product formation. The outer circular surface and the middle hole surface of the extrusion upper die core 3 are provided with working belt parts so as to reduce friction and forming pressure. During forming, the upper extrusion die is in downward contact with the blank, the lower extrusion die is combined to jointly extrude the blank to form a plunger forging, after extrusion is completed, the upper extrusion die is upward separated from the plunger forging, and the plunger forging is ejected by the lower extrusion die ejector rod 7 and is taken out manually or through a mechanical arm.
With the above-described preferred embodiments according to the present invention as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
Claims (2)
1. A process for manufacturing a hollow plunger forging of a high-pressure plunger pump is characterized by comprising the following steps of: comprises an outer shell and a middle bulge integrally connected with the outer shell, wherein the outer shell comprises an outer contour surface, an annular upper end surface, a lower end surface and a first inner contour surface, the middle bulge comprises a round upper end surface and a second inner contour surface, the first inner contour surface, the second inner contour surface and the lower end surface jointly form an annular deep hole cavity, the ratio of the height value to the diameter value of the annular deep hole cavity is more than 3, the height value of the middle bulge is more than the height value of the annular deep hole cavity, the first inner contour surface, the second inner contour surface and the lower end surface are all mold forming surfaces, the outer contour surface of the outer shell is provided with a forward extrusion cone angle which is 79-81 degrees, the forming process comprises the following steps,
(1) The blanking is carried out to obtain a blank P1,
(2) Performing surface shot blasting treatment on the blank P1 by adopting a shot blasting machine to obtain a shot-blasted blank P2,
(3) Carrying out surface lubrication treatment on the shot-blasting blank P2 to obtain a lubricated blank P3,
(4) Cold extrusion, namely forming the lubricated blank P3 in the step (3) on cold extrusion equipment by adopting a cold extrusion die M to obtain a hollow plunger forging, wherein the upper end surface of the blank P3 is required to be coated with lubricant during forming,
The blanking method in the step (1) is to saw the round bar material by a sawing machine, the diameter of shot blasting steel shot in the step (2) is phi 0.6 mm-phi 1.2mm, the specific process of surface lubrication treatment in the step (3) is to carry out surface phosphorus saponification treatment on the shot-blasted blank P2 so as to reduce the pressure during subsequent cold extrusion forming, the lubricant coated on the upper end face of the blank P3 in the step (4) is a mixture of molybdenum disulfide and lard,
The cold extrusion die M is a combined female die and comprises a material ejection rod, an extrusion lower die core, an extrusion lower die middle layer stress ring, an extrusion lower die outer layer stress ring, an extrusion upper die core, an extrusion upper die sleeve and an extrusion upper die cushion block,
The extrusion lower die core is provided with a back taper part, the extrusion lower die core is also provided with a die orifice guiding part for improving the forming coaxiality of products, and the outer circular surface and the middle hole surface of the extrusion upper die core are both provided with a working belt part for reducing friction and forming pressure.
2. A process for manufacturing a hollow plunger forging for a high-pressure plunger pump as set forth in claim 1, wherein: and PVD (physical vapor deposition) coatings are coated on the surfaces of the extrusion upper die core and the extrusion lower die core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111169227.5A CN113878085B (en) | 2021-10-08 | 2021-10-08 | Hollow plunger forging of high-pressure plunger pump and one-step forming process and die thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111169227.5A CN113878085B (en) | 2021-10-08 | 2021-10-08 | Hollow plunger forging of high-pressure plunger pump and one-step forming process and die thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113878085A CN113878085A (en) | 2022-01-04 |
| CN113878085B true CN113878085B (en) | 2024-04-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111169227.5A Active CN113878085B (en) | 2021-10-08 | 2021-10-08 | Hollow plunger forging of high-pressure plunger pump and one-step forming process and die thereof |
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| CN (1) | CN113878085B (en) |
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|---|---|---|---|---|
| EP1076181A2 (en) * | 1999-08-12 | 2001-02-14 | Brueninghaus Hydromatik Gmbh | Hollow piston for a piston machine |
| US6662709B1 (en) * | 1999-07-21 | 2003-12-16 | Brueninghaus Hydromatik Gmbh | Hollow piston for a piston engine and method for producing a hollow piston |
| CN101234401A (en) * | 2008-03-06 | 2008-08-06 | 中北大学 | Magnesium alloy automobile wheel extrusion molding method and mold |
| CN102151780A (en) * | 2011-03-02 | 2011-08-17 | 青岛益友锻压机械有限公司 | Complex part precision forging die with back pressure structure |
| CN104162556A (en) * | 2013-05-16 | 2014-11-26 | Sms米尔股份有限公司 | Method for operation of an indirect extrusion press and an indirect extrusion press |
| CN206810882U (en) * | 2017-06-22 | 2017-12-29 | 洛阳秦汉精工股份有限公司 | A kind of cold extrusion die of plug connector |
| CN109926801A (en) * | 2019-04-16 | 2019-06-25 | 四川坤成润科技有限公司 | A kind of processing method of hollow plunger |
| CN111745115A (en) * | 2020-07-21 | 2020-10-09 | 山东成通锻造有限公司 | Forging die and method for forging sprocket body |
-
2021
- 2021-10-08 CN CN202111169227.5A patent/CN113878085B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6662709B1 (en) * | 1999-07-21 | 2003-12-16 | Brueninghaus Hydromatik Gmbh | Hollow piston for a piston engine and method for producing a hollow piston |
| EP1076181A2 (en) * | 1999-08-12 | 2001-02-14 | Brueninghaus Hydromatik Gmbh | Hollow piston for a piston machine |
| CN101234401A (en) * | 2008-03-06 | 2008-08-06 | 中北大学 | Magnesium alloy automobile wheel extrusion molding method and mold |
| CN102151780A (en) * | 2011-03-02 | 2011-08-17 | 青岛益友锻压机械有限公司 | Complex part precision forging die with back pressure structure |
| CN104162556A (en) * | 2013-05-16 | 2014-11-26 | Sms米尔股份有限公司 | Method for operation of an indirect extrusion press and an indirect extrusion press |
| CN206810882U (en) * | 2017-06-22 | 2017-12-29 | 洛阳秦汉精工股份有限公司 | A kind of cold extrusion die of plug connector |
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| CN111745115A (en) * | 2020-07-21 | 2020-10-09 | 山东成通锻造有限公司 | Forging die and method for forging sprocket body |
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| Publication number | Publication date |
|---|---|
| CN113878085A (en) | 2022-01-04 |
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