CN109604511A - Threeway forging process for fuel method and its product - Google Patents
Threeway forging process for fuel method and its product Download PDFInfo
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- CN109604511A CN109604511A CN201910037485.4A CN201910037485A CN109604511A CN 109604511 A CN109604511 A CN 109604511A CN 201910037485 A CN201910037485 A CN 201910037485A CN 109604511 A CN109604511 A CN 109604511A
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- forging
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- blocking
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- 238000005242 forging Methods 0.000 title claims abstract description 92
- 238000000034 method Methods 0.000 title claims abstract description 43
- 230000008569 process Effects 0.000 title claims abstract description 23
- 239000000446 fuel Substances 0.000 title claims abstract description 18
- 230000000903 blocking effect Effects 0.000 claims abstract description 25
- 239000011248 coating agent Substances 0.000 claims abstract description 18
- 238000000576 coating method Methods 0.000 claims abstract description 18
- 238000004080 punching Methods 0.000 claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims abstract description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000000137 annealing Methods 0.000 claims abstract description 9
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 9
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 10
- 239000011343 solid material Substances 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 8
- 238000004321 preservation Methods 0.000 claims description 7
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 6
- 239000011230 binding agent Substances 0.000 claims description 6
- 150000001875 compounds Chemical class 0.000 claims description 6
- 239000000945 filler Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 claims description 4
- 239000004111 Potassium silicate Substances 0.000 claims description 3
- 239000004115 Sodium Silicate Substances 0.000 claims description 3
- ILRRQNADMUWWFW-UHFFFAOYSA-K aluminium phosphate Chemical compound O1[Al]2OP1(=O)O2 ILRRQNADMUWWFW-UHFFFAOYSA-K 0.000 claims description 3
- 230000001680 brushing effect Effects 0.000 claims description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 3
- 239000000292 calcium oxide Substances 0.000 claims description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 3
- 239000011247 coating layer Substances 0.000 claims description 3
- 238000003618 dip coating Methods 0.000 claims description 3
- PAZHGORSDKKUPI-UHFFFAOYSA-N lithium metasilicate Chemical compound [Li+].[Li+].[O-][Si]([O-])=O PAZHGORSDKKUPI-UHFFFAOYSA-N 0.000 claims description 3
- 229910052912 lithium silicate Inorganic materials 0.000 claims description 3
- 239000000395 magnesium oxide Substances 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 3
- NNHHDJVEYQHLHG-UHFFFAOYSA-N potassium silicate Chemical compound [K+].[K+].[O-][Si]([O-])=O NNHHDJVEYQHLHG-UHFFFAOYSA-N 0.000 claims description 3
- 229910052913 potassium silicate Inorganic materials 0.000 claims description 3
- 235000019353 potassium silicate Nutrition 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 238000010583 slow cooling Methods 0.000 claims description 3
- 235000019795 sodium metasilicate Nutrition 0.000 claims description 3
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 2
- 208000037656 Respiratory Sounds Diseases 0.000 abstract description 14
- 229910052751 metal Inorganic materials 0.000 abstract description 8
- 239000002184 metal Substances 0.000 abstract description 8
- 238000005299 abrasion Methods 0.000 abstract description 4
- 229910001566 austenite Inorganic materials 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 5
- 238000005422 blasting Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000009966 trimming Methods 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 210000000038 chest Anatomy 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000002918 waste heat Substances 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
- B21K1/00—Making machine elements
- B21K1/14—Making machine elements fittings
- B21K1/16—Making machine elements fittings parts of pipe or hose couplings
-
- 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
- B21J5/002—Hybrid process, e.g. forging following casting
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
The invention discloses a kind of threeway forging process for fuel method and its products, belong to forging field, including screen qualified blank and carry out blanking, and remove the formation blank end to end of blank in blanking process；Blank surface is coated into anticreep carbon coating；Forging heating of beginning is carried out to blank, begins forging heating temperature between 1100 DEG C -1150 DEG C；Carry out the blocking of preset times, 30%-45% of total blocking deflection in total forging deformation amount；Finish-forging is carried out, final forging temperature is not less than 960 DEG C；Carry out horizontal punching, vertical punching；Annealing.Initial forging temperature turns temperature between 1100 DEG C -1150 DEG C, higher than austenite, and easily deformable processing is less prone to fracture, temperature at 960 DEG C or more, be always maintained at preferably can forgeability, reduce the generation of crackle.When being forged, blocking is first carried out, reduces the deflection of finish-forging, is unlikely to be broken because deflection is excessive, while the abrasion of finish impression can also be reduced, prolong its service life, is easy to metal full of finish impression, final forging shape is more accurate.
Description
Technical field
The present invention relates to forgings, more specifically, it relates to a kind of threeway forging process for fuel method and its product.
Background technique
Forging be it is a kind of using metal forming machinery to metal stock apply pressure, make its generate plastic deformation with obtain have one
Determine the processing method of mechanical performance, certain shapes and size forging, one of the two big component parts of forging and stamping (forging and punching press).It is logical
The defects of as cast condition that metal generates in smelting process is loose can be eliminated by crossing forging, optimize heterogeneous microstructure, simultaneously because protecting
Complete metal streamline is deposited, the mechanical performance of forging is generally preferred over the casting of same material.High, work is loaded in associated mechanical
The important part of condition sternness mostly uses forging in addition to the plate of the better simply available rolling of shape, profile or weldment.
Currently, application No. is the Chinese patents of CN107983892A to disclose a kind of forging technology, it the following steps are included:
(1) it heats for the first time: being heated to be the steel ingot that will be forged in 700 DEG C or less 5.5 hours of heating, increase temperature in 700-800
10.5 hours are heated at DEG C, temperature are risen to 1220-1240 DEG C within 6.5 hours, then heat at 1220-1240 DEG C
2.5 hours；
(2) jumping-up, pressure side: punching machine is used；Base, using pneumatic hammer；Die forging, using the press that rubs；First time trimming, using punching
Bed utilizes steel ingot waste heat at this time；
(3) heat for second: the blank material of acquisition is heated again, is heated to 1090-1110 DEG C, then to steel ingot jumping-up, rotation
Turn to flatten；
(4) thermal recalibration；Second of trimming, using punching machine；Removing surface and ball blast carry out Shot Blasting using shot-blasting machine, and lead to
It crosses abrasive machine and carries out removing surface；
(5) to 4) blank material that obtains of step heated again, is heated to 1060 ~ 1090 DEG C, after the required specification of forging, moves back
Fire: 800~900 DEG C of slow cooling, quenching: 1050~1100 DEG C of oil are cold；
(6) ultrasonic examination is examined；
(7) ball blast and cold sizing carry out Shot Blasting using shot-blasting machine, and cold calibration is using the press that rubs；
(8) it examines；
(9) forging is put into after being soaked for a period of time in antirust solution and pulls out by antirust treatment；
(10) it completes, obtains finished product.
Although this forging technology cracks when can effectively reduce forging, it is cumbersome that its technique is excessively sent out miscellaneous,
Cost is also higher.
Summary of the invention
In view of the deficiencies of the prior art, the present invention intends to provide a kind of threeway forging process for fuel method and its system
Product have the advantages that reduce crackle and simple and practical.
To achieve the above object, the present invention provides the following technical scheme that
In a first aspect, a kind of threeway forging process for fuel method is provided, including
It screens qualified blank and carries out blanking, and remove the formation blank end to end of blank in blanking process；
Blank surface is coated into anticreep carbon coating；
Forging heating of beginning is carried out to blank, begins forging heating temperature between 1100 DEG C -1150 DEG C；
The blocking of preset times is carried out, for total blocking deflection in the 30%-45% of total forging deformation amount, each blocking deflection must not
Greater than benchmark deflection；
Finish-forging is carried out, final forging temperature is not less than 960 DEG C；
Horizontal punching, vertical punching are carried out with the punching speed lower than preset value；
Annealing.
By adopting the above technical scheme, blank is screened first, rejects rejected product, reduce non-productive work, promote life
Produce efficiency.Furthermore anticreep carbon coating is coated to the surface of blank, controls the scaling loss of blank.Initial forging temperature is at 1100 DEG C -1150 DEG C
Between, turn temperature higher than austenite, blank is softer at this time, easily deformable processing, is less prone to fracture, while forging temperature is at end
Forging complete when be also maintained at 960 DEG C or more, make blank be always maintained at preferably can forgeability, reduce the generation of crackle.Carry out
When forging, blocking is first carried out, reduces the deflection of finish-forging, is unlikely to be broken because deflection is excessive, while end can also be reduced
The abrasion of forging die thorax, prolongs its service life, and is easy to metal full of finish impression, final forging shape is more accurate.Separately
Outside, when being punched out, strict control punching speed further avoids fracture and the generation of crackle.
Further, the anticreep carbon coating is made of solid material and water, and wherein solid material forms are as follows: compound binding agent
8%-54%, basic filler 46%-92%, water are 0.5-20 times of solid material weight；The basic filler by chemistry at
Divide by silica 30%-90%, aluminum oxide 1%-60%, magnesia 1%-10%, the oxidation of calcium oxide 1%-5% and three
Two boron 0-5% composition；
The compound binding agent by the sodium metasilicate of 20%-90%, the potassium silicate of 0-20%, 0-15% lithium metasilicate, 2%-
70% aluminum phosphate composition；
Grain graininess in the high-temperature oxidation resistant coating is narrower than 500 microns；
By coating brushing, dip-coating or room temperature is sprayed to 1000 °C of blank surfaces, and coating layer thickness is 0.2-0.8 millimeters；
The application environment of coating is 1400 DEG C hereinafter, the heatproof time is 20-30min.
By adopting the above technical scheme, above-mentioned coating is coated in blank surface, the scaling loss that blank is subjected to high temperature can be reduced, avoided
The performance of burning influence forging.
It further, further include beginning to preheat blank before forging heating, preheating includes from 660 DEG C to 860 DEG C
It is gradually warmed up heating 30min-60min.
By adopting the above technical scheme, the impurity easily removed is removed, the quality and performance of blank material are improved, it is disconnected to reduce blank
It splits or crackle.
Further, the raising temperature of blocking is not higher than 1250 DEG C.
By adopting the above technical scheme, the scaling loss that blank is generated by high temperature is reduced.
Further, the deformation quantity of each blocking is not more than the 10% of total forging deformation amount.
By adopting the above technical scheme, the deformation quantity of each blocking is controlled, to reduce the possibility that blocking cracks.
Further, annealing is included in 600 DEG C of -700 DEG C of heat preservation 40-80min.
By adopting the above technical scheme, fracture or crackle caused by avoiding forging from rapidly reducing because of temperature, while at 600 DEG C -700
DEG C heat preservation 40-80min help to stablize the performance of forging.
Further, annealing further includes that forging is put into sand pit Slow cooling after heat preservation.
By adopting the above technical scheme, facilitate reduce forging is rapidly reduced because of temperature caused by fracture or crackle.
Second aspect provides a kind of threeway forging for applying threeway forging process for fuel method as described above to obtain.
By adopting the above technical scheme, forging is not likely to produce fracture or crackle, and defect rate is low.
In conclusion the invention has the following advantages:
1. a pair blank screens, rejected product is rejected, reduces non-productive work, improving production efficiency；
2. initial forging temperature turns temperature between 1100 DEG C -1150 DEG C, higher than austenite, blank is softer at this time, easily deformable to add
Work is less prone to fracture, while forging temperature is also maintained at 960 DEG C or more when finish-forging is completed, and is always maintained at blank preferably
Can forgeability, reduce the generation of crackle；
3. first carrying out blocking when being forged, the deflection of finish-forging is reduced, is unlikely to be broken because deflection is excessive, simultaneously
The abrasion that finish impression can also be reduced, prolongs its service life, and is easy to metal full of finish impression, final forging shape
It is more accurate；
4. when being punched out, strict control punching speed further avoids fracture and the generation of crackle.
Detailed description of the invention
Fig. 1 is the flow diagram of threeway forging process for fuel method in the present invention.
Specific embodiment
With reference to the accompanying drawings and embodiments, the present invention will be described in detail.
This specific embodiment is only explanation of the invention, is not limitation of the present invention, those skilled in the art
Member can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but as long as at this
All by the protection of Patent Law in the scope of the claims of invention.
A kind of threeway forging process for fuel method, referring to Fig.1 comprising step S101 to step S108, specifically:
Step S101: it screens qualified blank and carries out blanking, and remove the formation blank end to end of blank in blanking process.
Qualified carry out blanking is screened from original blank, rejected product is rejected, helps to reduce invalid processing, is improved
Production efficiency in the present embodiment, specifically carries out sorting, blanking and cutting blank end to end using band sawing machine.
Step S102: blank surface is coated into anticreep carbon coating.
Anticreep carbon coating is made of solid material and water, and wherein solid material forms are as follows: compound binding agent 8%-54%, base
This filler 46%-92%, water are 0.5-20 times of solid material weight；Basic filler is according to chemical composition by silica 30%-
90%, aluminum oxide 1%-60%, magnesia 1%-10%, calcium oxide 1%-5% and diboron trioxide 0-5% composition.
Wherein, compound binding agent by the sodium metasilicate of 20%-90%, the potassium silicate of 0-20%, 0-15% lithium metasilicate, 2%-
70% aluminum phosphate composition.
In addition, the grain graininess of anticreep carbon coating is narrower than 500 microns.In use, by coating brushing, dip-coating or being sprayed at
For room temperature to 1000 °C of blank surfaces, coating layer thickness is 0.2-0.8 millimeters.The application environment of coating is 1400 DEG C hereinafter, when heatproof
Between be 20-30min.
Step S103: preheating blank, and preheating includes that heating 30min- is gradually warmed up from 660 DEG C to 860 DEG C
60min。
When preheating, blank is placed under 660 DEG C to 860 DEG C of temperature environment and slowly promotes temperature, and maintain 30min-
60min removes the impurity easily removed, improves the quality and performance of blank material, reduces blank fracture or crackle.
Step S104: carrying out forging heating of beginning to blank, begins forging heating temperature between 1100 DEG C -1150 DEG C.
Initial forging temperature turns temperature between 1100 DEG C -1150 DEG C, higher than austenite, and blank is softer at this time, easily deformable to add
Work is less prone to fracture.
Step S105: carrying out the blocking of preset times, total blocking deflection total forging deformation amount 30%-45%, every time
Blocking deflection is not greater than benchmark deflection.
When being forged, blocking is first carried out, reduces the deflection of finish-forging, is unlikely to be broken because deflection is excessive, together
When can also reduce the abrasion of finish impression, prolong its service life, be easy to metal full of finish impression, final forging shape
Shape is more accurate.
In addition, the raising temperature of blocking is not higher than 1250 DEG C, the scaling loss that blank is generated by high temperature is reduced.The shape of each blocking
Variable is not more than the 10% of total forging deformation amount.The deformation quantity of each blocking is controlled, to reduce the possibility that blocking cracks.
Step S106: carrying out finish-forging, and final forging temperature is not less than 960 DEG C；
Forging temperature is also maintained at 960 DEG C or more when finish-forging is completed, make blank be always maintained at preferably can forgeability, reduction splits
The generation of line.
Step S107: horizontal punching, vertical punching are carried out with the punching speed lower than preset value.
In addition, when being punched out, strict control punching speed further avoids fracture and the generation of crackle.
Step S108: annealing.
Annealing is included in 600 DEG C of -700 DEG C of heat preservation 40-80min, and after heat preservation, forging is put into sand pit and is delayed
Slow cool down.Fracture or crackle caused by avoiding forging from rapidly reducing because of temperature, while in 600 DEG C of -700 DEG C of heat preservation 40-80min, have
Help stablize the performance of forging, reduction forging is broken caused by rapidly reducing because of temperature or crackle.
Embodiment 2
A kind of threeway forging is processed using the threeway forging process for fuel method in such as embodiment 1 and is obtained.
The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
Those of ordinary skill for, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (8)
1. a kind of threeway forging process for fuel method, it is characterised in that: including
It screens qualified blank and carries out blanking, and remove the formation blank end to end of blank in blanking process；
Blank surface is coated into anticreep carbon coating；
Forging heating of beginning is carried out to blank, begins forging heating temperature between 1100 DEG C -1150 DEG C；
The blocking of preset times is carried out, for total blocking deflection in the 30%-45% of total forging deformation amount, each blocking deflection must not
Greater than benchmark deflection；
Finish-forging is carried out, final forging temperature is not less than 960 DEG C；
Horizontal punching, vertical punching are carried out with the punching speed lower than preset value；
Annealing.
2. threeway forging process for fuel method according to claim 1, it is characterised in that: the anticreep carbon coating is by solid material
It is formed with water, wherein solid material forms are as follows: compound binding agent 8%-54%, basic filler 46%-92%, water is solid material
0.5-20 times of weight；The basic filler is according to chemical composition by silica 30%-90%, aluminum oxide 1%-
60%, magnesia 1%-10%, calcium oxide 1%-5% and diboron trioxide 0-5% composition；
The compound binding agent by the sodium metasilicate of 20%-90%, the potassium silicate of 0-20%, 0-15% lithium metasilicate, 2%-
70% aluminum phosphate composition；
Grain graininess in the high-temperature oxidation resistant coating is narrower than 500 microns；
By coating brushing, dip-coating or room temperature is sprayed to 1000 °C of blank surfaces, and coating layer thickness is 0.2-0.8 millimeters；
The application environment of coating is 1400 DEG C hereinafter, the heatproof time is 20-30min.
3. threeway forging process for fuel method according to claim 2, it is characterised in that: further include before forging heating of beginning to base
Part is preheated, and preheating includes that heating 30min-60min is gradually warmed up from 660 DEG C to 860 DEG C.
4. threeway forging process for fuel method according to claim 1, it is characterised in that: the raising temperature of blocking is not higher than 1250
℃。
5. threeway forging process for fuel method according to claim 1, it is characterised in that: the deformation quantity of each blocking is no more than total
The 10% of forging deformation amount.
6. threeway forging process for fuel method according to claim 1, it is characterised in that: annealing is included in 600 DEG C -700
DEG C heat preservation 40-80min.
7. threeway forging process for fuel method according to claim 6, it is characterised in that: annealing further includes keeping the temperature
Afterwards, forging is put into sand pit Slow cooling.
8. a kind of threeway forging that application threeway forging process for fuel method as described in claim 1 to 7 is any obtains.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910037485.4A CN109604511A (en) | 2019-01-15 | 2019-01-15 | Threeway forging process for fuel method and its product |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910037485.4A CN109604511A (en) | 2019-01-15 | 2019-01-15 | Threeway forging process for fuel method and its product |
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| CN109604511A true CN109604511A (en) | 2019-04-12 |
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Cited By (3)
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| CN111014535A (en) * | 2019-11-27 | 2020-04-17 | 江苏亚星锚链股份有限公司 | Forging method of riveting swivel of R6-grade mooring chain |
| CN113118351A (en) * | 2019-12-31 | 2021-07-16 | 上海新闵重型锻造有限公司 | Multi-way pipe fitting forging method |
| CN113231584A (en) * | 2021-04-19 | 2021-08-10 | 上海长特锻造有限公司 | Processing technology of three arms |
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|---|---|---|---|---|
| CN111014535A (en) * | 2019-11-27 | 2020-04-17 | 江苏亚星锚链股份有限公司 | Forging method of riveting swivel of R6-grade mooring chain |
| CN113118351A (en) * | 2019-12-31 | 2021-07-16 | 上海新闵重型锻造有限公司 | Multi-way pipe fitting forging method |
| CN113118351B (en) * | 2019-12-31 | 2024-06-11 | 上海新闵新能源科技股份有限公司 | Forging method for multi-way pipe fitting |
| CN113231584A (en) * | 2021-04-19 | 2021-08-10 | 上海长特锻造有限公司 | Processing technology of three arms |
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