CN111468660A - Super-long forging with small holes and process based on telescopic die - Google Patents
Super-long forging with small holes and process based on telescopic die Download PDFInfo
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- CN111468660A CN111468660A CN202010304306.1A CN202010304306A CN111468660A CN 111468660 A CN111468660 A CN 111468660A CN 202010304306 A CN202010304306 A CN 202010304306A CN 111468660 A CN111468660 A CN 111468660A
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- telescopic
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- 238000005242 forging Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 17
- 229910001069 Ti alloy Inorganic materials 0.000 claims abstract description 15
- 230000006698 induction Effects 0.000 claims abstract description 15
- 238000004513 sizing Methods 0.000 claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 claims abstract description 14
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 13
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000002844 melting Methods 0.000 claims abstract description 9
- 230000008018 melting Effects 0.000 claims abstract description 9
- 229910052751 metal Inorganic materials 0.000 claims description 27
- 239000002184 metal Substances 0.000 claims description 27
- 238000010438 heat treatment Methods 0.000 claims description 12
- 230000001050 lubricating effect Effects 0.000 claims description 10
- 239000011521 glass Substances 0.000 claims description 3
- 239000000314 lubricant Substances 0.000 claims description 3
- 238000005422 blasting Methods 0.000 claims description 2
- 230000002035 prolonged effect Effects 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 3
- 239000000835 fiber Substances 0.000 abstract description 3
- 239000010959 steel Substances 0.000 abstract description 3
- 230000002500 effect on skin Effects 0.000 description 9
- 238000003754 machining Methods 0.000 description 4
- 239000004020 conductor Substances 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 229910000997 High-speed steel Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- UQZIWOQVLUASCR-UHFFFAOYSA-N alumane;titanium Chemical compound [AlH3].[Ti] UQZIWOQVLUASCR-UHFFFAOYSA-N 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Images
Classifications
-
- 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
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
- B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
-
- 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
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/10—Piercing billets
Abstract
A telescopic die for manufacturing a super long forging with a small hole, comprising: an inner chamber portion and an outer chamber portion, the inner chamber portion comprising: the needle rod, the inner convex die, the outer convex die and the concave die are coaxially arranged from inside to outside in sequence, and the needle rod is movably arranged inside the inner convex die and in a concave die sizing hole of the concave die; the outer chamber portion includes: the surface of the inner side of the guard ring, which is contacted with the outer ring, is provided with a medium-frequency induction heater, and the insert, the inner male die, the outer male die and the female die together form a conical cavity for accommodating the pipe blank; the needle rod is made of superhard aluminum and is melted in the process of manufacturing the titanium alloy overlong forging piece with the small hole. According to the invention, the flexible aluminum needle rod with the same diameter as the inner hole is used as the needle rod instead of a steel punch, so that the forging meeting the conditions is obtained according to the melting point difference, the fiber streamline in the hole during deformation is reserved, the efficiency is high, the performance is good, and the use standard of aerospace engineering is met.
Description
Technical Field
The invention relates to a technology in the field of metal pressure processing, in particular to a telescopic die-based manufacturing of super-long forgings such as stainless steel, titanium alloy and the like with small holes and a process thereof.
Background
In mechanical manufacture, particularly in aerospace components, many critical components require thin-walled, thin, long internal bores that are not susceptible to exposure to metal flow lines for safe life, and machining and electroerosion machining of the bores. Similar parts are applied to aerospace high-pressure hydraulic systems and fuel combustion devices, and therefore, the parts cannot be used for slender holes smaller than or equal to 1mm by using a cutting machining process.
Disclosure of Invention
The invention provides a telescopic die-based overlong forging piece and a process for manufacturing the overlong forging piece with a small hole, aiming at solving the problems that the existing dies for manufacturing alloy forging pieces can not solve the problem that the small hole is formed or the formed aperture can not reach phi 1mm, wherein the overlong forging piece and the process are characterized in that a medium-frequency induction heating skin effect is utilized, a flexible ultrahard aluminum needle rod with the same diameter as an inner hole is used for replacing a steel punch head to be used as a needle rod, and the small hole overlong forging piece meeting the conditions is obtained aiming at the difference of melting points of; when metal is used for forward extrusion, the downward flowing metal generates additional tensile stress on the needle rod and tightly holds the needle rod to move downwards to form a small hole. Therefore, fiber streamlines in the holes during deformation are reserved, the precision is high, the performance is good, and the use standard of aerospace engineering is met.
The invention is realized by the following technical scheme:
the invention relates to a telescopic die for manufacturing an ultralong forging with a small hole, which comprises: an inner cavity portion and an outer cavity portion, wherein: the inner chamber portion is disposed within the outer chamber portion.
The inner cavity part comprises: by interior and outer pin rod, interior terrace die, evagination mould and the relative die that interior terrace die set up of coaxial setting in proper order, wherein: the needle rod is movably arranged in the inner male die and the female die sizing hole.
The outer cavity part comprises: the protective ring and set up rather than inside outer lane and insert, wherein: the surface of the inner side of the retainer, which is contacted with the outer ring, is provided with a medium-frequency induction heater, and the insert, the inner male die, the outer male die and the female die form a conical cavity for accommodating the pipe blank together.
Preferably, enough space is arranged between the insert and the female die to accommodate the extruded forging, and the space satisfies that the inner diameter is 10-15mm larger than the outer diameter of the extruded forging and the length is 50-100mm larger than the extruded forging.
The needle rod is made of superhard aluminum, and the needle rod starts to melt and drip after the small hole of the titanium alloy overlong forging with the small hole is formed.
And a lubricating pad matched with the pipe blank is arranged in the outer convex die.
The invention relates to a process for manufacturing a titanium alloy overlong forging with a small hole based on the telescopic die, which comprises the following specific steps of:
step 1: assembling the die, putting the tube blank into the outer ring to form a cavity together with the inner and outer convex dies, and heating the tube blank by using a medium-frequency induction heater.
Step 2: rapidly extruding the heated pipe blank downwards into the conical cavity S by using the outer convex die and enabling the heated pipe blank to pass through the female die sizing hole, and holding the needle rod to move downwards together when the extruded metal passes through the female die sizing hole to form an ultra-long forging with a small hole;
and step 3: and (3) the temperature in the forging after passing through the sizing hole of the female die reaches the melting temperature of the needle rod made of superhard aluminum, the needle rod is melted and freely drops from the hole of the forging by self weight, the forging is taken down, and residues in the inner hole are removed by using ultrasonic waves to obtain the titanium alloy overlong forging with the small hole.
The medium-frequency induction heating temperature is 950 ℃.
The invention relates to a titanium alloy super-long forging with small holes, which is prepared based on the process, and has the outer diameter phi 10mm, the inner diameter phi 1mm and the length 1060 mm.
Technical effects
The invention integrally solves the technical problems that a part phi ≦ 1mm extra-long small hole which is specially required for aerospace cannot be manufactured by a machining method, a chemical corrosion method and other methods, a steel punch is replaced by a flexible aluminum needle rod with the same diameter as an inner hole and a telescopic needle rod in a die, an extra-long forge piece meeting the conditions is obtained by melting the aluminum needle rod aiming at the aluminum-titanium melting point difference, a complete fiber streamline in the hole during deformation is reserved, the precision is high, the performance is good, the press can be completed by one stroke, and the use requirements of aerospace engineering are met.
Compared with the prior art, the invention utilizes the medium-frequency induction heating skin effect, skillfully adopts the superhard aluminum with low melting point as the needle bar, and ensures the formation of small holes; when metal is used for forward extrusion, the downward flowing metal generates additional tensile stress on the core rod, and the core rod is tightly held to move downwards to form the precise size of the small hole.
Drawings
FIG. 1 is a schematic cross-sectional view of the present invention;
in the figure: the structure comprises an inner male die 1, an outer male die 2, a tube blank 3, a lubricating pad 4, an outer ring 5, an insert 6, a retainer 7, a female die 8, a conical cavity 9, a needle rod 10, a female die sizing hole 11, an overlong forging 12 with small holes, a medium-frequency induction heater 13, an inner cavity part 14 and an outer cavity part 15, wherein H is the distance from the lower end plane of the inner male die to the lower end face of the needle rod, H is the height of the female die sizing hole, and S is a conical cavity gap;
FIG. 2 is a drawing of the blank and forging used;
in the figure: a is a blank, b is a forged piece, and c is a forged piece object;
FIG. 3 is a schematic diagram of the skin effect of the present invention;
FIG. 4 is a schematic diagram of additional stress applied to the outer and inner layers of forward extruded metal in accordance with the present invention.
Detailed Description
As shown in fig. 1, the present embodiment relates to a telescopic mold for a titanium alloy forging, the mold is disposed on a 5MN double-acting hydraulic press, and the mold includes: an inner chamber portion 14 and an outer chamber portion 15, wherein: the inner chamber portion 14 is disposed within the outer chamber portion 15.
The inner chamber portion 14 includes: needle bar 10, interior convex mould 1, evagination mould 2 and die 8, wherein: the inner male die 1 is fixedly arranged on an inner sliding block of the double-acting hydraulic press, the outer male die 2 is fixedly arranged on an outer sliding block of the press, a needle rod 10 made of superhard aluminum is arranged in the inner male die 1 in a sliding fit mode and penetrates through the center, the inner male die 1 is arranged at the inner center of the outer male die 2, the outer male die 2 is arranged in an outer cavity part 15, a female die 8 positioned in an insert 6 is arranged at the bottoms of the inner male die 1 and the outer male die 2 and is arranged in the outer cavity part 15, and the inner male die 1, the outer male die 2 and the female.
The distance of the needle bar penetrating through the female die 8 is 5 mm.
And a concave die sizing hole 11 is arranged in the concave die 8.
The female die 8 is made of high-speed steel W18Cr4V and is subjected to heat treatment of 50-52 HRC.
The needle rod 10 is made of 7075 super-hard aluminum alloy and is treated by T6.
And a conical cavity gap S between the inner convex die 1 and the female die 8 meets the requirement of accommodating the volume of metal extruded into the tube blank.
The present embodiment preferably sprays glass lubricant into the conical cavity 9.
The outer chamber portion 15 includes: outer ring 5, insert 6 and retainer 7, wherein: the outer ring 5 is arranged outside the inner cavity part 14 and in the guard ring 7, and the inner side of the guard ring 7 is provided with the medium-frequency induction heater 13; the insert 6 is disposed below the outer race 5 and the inner cavity portion 14.
And a lubricating pad 4 matched with the tube blank 3 is arranged in the outer convex die 2, the material of the lubricating pad 4 is a glass lubricant, and the lubricating pad 4 is arranged on the upper end surface of the tube blank 3.
In the embodiment, before the lubricating pad 4 is placed, the surface treatment of shot blasting is preferably carried out on the tube blank 3, so that the friction coefficient between the die and the blank is reduced to 0.08-0.10 by the lubricating pad 4 in the deformation process, and the service life of the die is prolonged by 20-30%.
In the embodiment, based on the needle bar telescopic structure of the specific titanium alloy forging of the die, the adopted blank is a TC4 tube blank with an outer diameter phi of 50mm, an inner diameter phi of 20mm and a length of 50mm, as shown in FIG. 2 a.
The embodiment relates to a manufacturing process of a titanium alloy overlong forging with a small hole of the die, which comprises the following steps of:
Step 2, starting the double-acting hydraulic press and the outer slide block system, quickly extruding the heated tube blank into the conical gap S and the gauge hole 11 of the female die 8, and wrapping the needle rod; and starting the inner slide block system to extrude the metal downwards, wherein the metal flowing through the sizing hole tightly holds the needle rod due to the action of additional tensile stress and pulls the needle rod 10 to move downwards, the needle rod 10 can slide in the center of the inner male die in the air to form an ultra-long forging 12 and an inner hole thereof, as shown in figure 2b, and as shown in figure 2c for an object.
During the forward extrusion, as the deformed metal of the tube blank 3 flows into the female die 8, when the metal flows to the inlet of the female die 8, the metal is held behind the needle rod 10 inserted into the inner male die 1 in advance and rubs with the surface of the needle rod 10 to generate additional tensile stress, and the needle rods are pulled to move downwards together.
As shown in fig. 4, the additional tensile stress is: due to the action of friction force between the inner wall of the female die and the deformed metal, the difference of the flow speeds of the metal at the central part of the workpiece being extruded and the surface metal is caused. This non-uniformity of metal deformation at each section results in axially additional tensile stresses that are detrimental to plastic flow. The additional stress to which the outer metal is subjected is a tensile stress and the additional stress to which the intermediate metal is subjected is a compressive stress. The outer surface of the shank 10 is under tensile stress.
The metal deformation displacement speed is 300mm/s, and the time in the telescopic die is 1.2 × 10-3s, the tube blank 3 is instantaneously heated, and the heat is not completely transferred to the needle bar 10 in a very short time due to the skin effect. At the moment, the pressure value of the needle rod 10 is 510MPa, and the strength sigma of the superhard aluminum needle rodbAnd is also adequate.
As shown in fig. 3, the skin effect is: the skin effect is generated by alternating current passing through the conductor, in which alternating magnetic field is established in the conductor, the magnetic flux linked with the core of the conductor is more than that on the surface, so that the current is not uniform in the cross section and is gathered on the surface, and the skin effect is generated. The workpiece generates eddy current under the alternating magnetic field, the distribution of the eddy current tends to flow on the surface layer, the maximum current density appears on the surface, and the eddy current attenuates to the heart part by an exponential function.
Step 3, in the deformation area, the time is 1.2 × 10-3s is very short, and the needle shaft 10 has not yet been heated by the skin effect of induction heatingAnd melted to form the bore of the forging 12 with the deformed metal. In the further downward movement, after passing through the die sizing hole 11, the needle rod in the forging 12 has been transferred to the core due to heat, and the needle rod 10 melts and drops downward based on gravity.
And 4, picking up the forged piece, and immediately cleaning residues in the inner hole by using ultrasonic waves to obtain the standard forged piece 12, as shown in fig. 2 c.
The titanium blank of the standard forging 12: the outer diameter is 50mm, the inner diameter is 20mm, and the length is 50mm, as shown in figure 2 a; according to the volume invariance rule, when the outer diameter phi of the forge piece is 10mm and the inner diameter phi is 1mm, the length can be calculated according to the following mode:
l is 1060.6mm, the length of the obtained forged piece is 1059-1061 mm, and the aperture is 0.98-1.01 mm.
And 5, the inner slide block and the male die 1 are restored to the original positions, the outer slide block moves upwards, the outer male die 2 is pulled, and the system enters the next period.
According to the invention, the flowing metal at the inlet of the female die tightly holds the needle rod to ensure the formation of the small hole size through the large-size necking deformation of the thick-wall pipe; the heating time and the die running time are calculated and controlled to ensure that the selected needle bar is not heated to melt before the extruded metal flows out of the sizing hole of the female die, namely before the small hole is formed, the selected needle bar can bear the pressure, and heat is transmitted to the selected needle bar after forming to melt the selected needle bar to form the small hole.
When the needle bar is made of superhard aluminum alloy 7075 and the medium-frequency induction heating temperature is 950 ℃, the metal deformation displacement speed is 300mm/s, and the time of the needle bar in the telescopic die is 1.2 × 10-3s, the pressure value is 510MPa, so that 7075 superhard aluminum is selected. One is because it can withstand additional tensile stresses; secondly, the melting point is 660 ℃, and the temperature difference with the melting point 1650 ℃ of the titanium alloy is larger.
Compared with the prior art, the invention can forge the precise and ultra-long forging with the small hole in one stroke of the press, and the forging can be used for producing high-requirement parts which are difficult to produce by other methods. Has forward significance for aerospace, aviation and national defense. The process and the die structure are also suitable for manufacturing the alloy super-long forgings with small holes, such as stainless steel and the like.
The foregoing embodiments may be modified in many different ways by those skilled in the art without departing from the spirit and scope of the invention, which is defined by the appended claims and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (8)
1. A telescopic die for manufacturing a super-long forging with a small hole is characterized by comprising: an inner cavity portion and an outer cavity portion, wherein:
the inner cavity part comprises: by interior and outer pin rod, interior terrace die, evagination mould and the relative die that interior terrace die set up of coaxial setting in proper order, wherein: the needle rod is movably arranged in the inner male die and passes through the sizing hole of the female die;
the outer cavity part comprises: the protective ring and set up rather than inside outer lane and insert, wherein: the surface of the inner side of the guard ring, which is contacted with the outer ring, is provided with a medium-frequency induction heater, and the insert, the inner male die, the outer male die and the female die together form a conical cavity for accommodating the pipe blank;
the needle rod is made of superhard aluminum, and the needle rod starts to melt after an inner hole of the titanium alloy overlong forging with the small hole is formed.
2. The telescopic die of claim 1, wherein the insert and the die have a space therebetween sufficient to accommodate the extruded forging, the space having an inner diameter 10-15mm greater than the outer diameter of the extruded forging and a length 50-100mm greater than the extruded forging.
3. The telescopic mold of claim 1, wherein a lubricating pad is arranged in the outer convex mold and used for matching with the tube blank.
4. The telescopic die of claim 1, wherein the tapered cavity space between the inner and outer punch, die and insert is sized to accommodate the metal volume of the pipe blank.
5. The telescopic die of claim 1, wherein a glass lubricant is sprayed into the tapered cavity.
6. A manufacturing process of a titanium alloy overlong forging with a small hole based on the telescopic die as claimed in any one of the preceding claims, which is characterized by comprising the following steps:
step 1: assembling a mould, placing the pipe blank in the outer ring and below the outer convex mould, and heating the pipe blank by using a medium-frequency induction heater;
step 2: rapidly extruding the heated pipe blank downwards by using an outer convex die to reach a female die sizing hole, and then extruding metal by using an inner convex die to pass through the female die sizing hole and embrace a needle rod to move downwards together to form an ultra-long forging with a small hole;
and step 3: and (3) the temperature in the forging after passing through the sizing hole of the female die reaches the melting temperature of the needle rod made of superhard aluminum, the needle rod is melted and freely drips from the hole of the forging by self weight, the forging is picked off, and residues in the inner hole are cleaned by ultrasonic waves to obtain the titanium alloy overlong forging with the small hole.
7. The process for manufacturing the titanium alloy ultra-long forging according to claim 6, wherein before the lubricating pad is placed, the blank is subjected to shot blasting, so that the friction coefficient between the die and the blank is reduced to 0.08-0.10 in the deformation process of the lubricating pad, and the service life of the die is prolonged by 20-30%.
8. The process of manufacturing the titanium alloy super long forgings according to claim 6, wherein the medium frequency induction heating temperature is 950 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010304306.1A CN111468660B (en) | 2020-04-17 | 2020-04-17 | Super-long forging with small holes and process based on telescopic die |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010304306.1A CN111468660B (en) | 2020-04-17 | 2020-04-17 | Super-long forging with small holes and process based on telescopic die |
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| Publication Number | Publication Date |
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| CN111468660A true CN111468660A (en) | 2020-07-31 |
| CN111468660B CN111468660B (en) | 2021-07-06 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113369325A (en) * | 2021-06-11 | 2021-09-10 | 中国兵器工业第五九研究所 | Extrusion forming process |
| CN113369329A (en) * | 2021-06-11 | 2021-09-10 | 中国兵器工业第五九研究所 | Multifunctional extrusion die with open cavity |
| CN114088617A (en) * | 2021-11-18 | 2022-02-25 | 上海交通大学 | Hot forging friction and lubrication effect optimization detection method |
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| JPH05275258A (en) * | 1992-03-24 | 1993-10-22 | Kanegafuchi Chem Ind Co Ltd | Manufacture of long bond magnet using mobile sizing die, its manufacture device and long bond magnet manufactured by the method |
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| JPH05275258A (en) * | 1992-03-24 | 1993-10-22 | Kanegafuchi Chem Ind Co Ltd | Manufacture of long bond magnet using mobile sizing die, its manufacture device and long bond magnet manufactured by the method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113369325A (en) * | 2021-06-11 | 2021-09-10 | 中国兵器工业第五九研究所 | Extrusion forming process |
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| CN114088617A (en) * | 2021-11-18 | 2022-02-25 | 上海交通大学 | Hot forging friction and lubrication effect optimization detection method |
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| Publication number | Publication date |
|---|---|
| CN111468660B (en) | 2021-07-06 |
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Denomination of invention: Manufacturing of Ultra Long Forgings with Small Holes Based on Telescopic Dies and Its Process Effective date of registration: 20231019 Granted publication date: 20210706 Pledgee: Meixi Branch of Zhejiang Anji Rural Commercial Bank Co.,Ltd. Pledgor: ZHEJIANG SHENJI TITANIUM INDUSTRY Co.,Ltd. Registration number: Y2023330002372 |