CN103480784A - Method for manufacturing drum forging for centrifugal machine - Google Patents
Method for manufacturing drum forging for centrifugal machine Download PDFInfo
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- CN103480784A CN103480784A CN201310445221.5A CN201310445221A CN103480784A CN 103480784 A CN103480784 A CN 103480784A CN 201310445221 A CN201310445221 A CN 201310445221A CN 103480784 A CN103480784 A CN 103480784A
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- 238000005242 forging Methods 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims abstract description 65
- 239000000463 material Substances 0.000 claims abstract description 29
- 238000004080 punching Methods 0.000 claims abstract description 14
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 14
- 239000010935 stainless steel Substances 0.000 claims abstract description 13
- 238000009413 insulation Methods 0.000 claims description 45
- 238000007493 shaping process Methods 0.000 claims description 30
- 238000010792 warming Methods 0.000 claims description 16
- 229910000859 α-Fe Inorganic materials 0.000 claims description 14
- 238000005520 cutting process Methods 0.000 claims description 6
- 230000014759 maintenance of location Effects 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 238000009740 moulding (composite fabrication) Methods 0.000 abstract 2
- 238000003754 machining Methods 0.000 abstract 1
- 239000006104 solid solution Substances 0.000 abstract 1
- 229910000885 Dual-phase steel Inorganic materials 0.000 description 3
- 208000037656 Respiratory Sounds Diseases 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
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Abstract
The invention discloses a method for manufacturing a drum forging for a centrifugal machine. The method mainly includes the following steps: (1), blanking and heating; (2), upsetting and rivet-ramming; (3), heating and punching; (4), heating, splitting and reaming; (5), heating, mandrel supporter reaming, heating and mandrel supporter forming; (6), solid solution heat treatment, forming and machining. By the method, forging of a simple rectangular blank is not needed when forging a ring blank, a special-shaped blank closer to a final shape of the forging is forged, deformation quantity of each part of the forging is enabled to be relatively uniform, and generation of internal stress inside a material is avoided, so that generation of cracks and holes is avoided; a reasonable drum forging manufacturing method is adopted, so that the problems that 1.4462 austenitic-ferritic type stainless steel is poor in plasticity and a manufactured centrifugal machine drum forging is prone to deformation and generation of cracks and holes are solved.
Description
Technical field
The present invention relates to the manufacture method of a kind of centrifuge with the rotary drum forging.
Background technology
1.4462 austenite-ferrite type stainless steel is a kind of two phase stainless steel, when heating, in 700～900 ℃, warm area is easily separated out fragility phase б phase, while causing heating the cracking and because of this material thermal conductivity low, when low temperature, warm-up phase requirement heating furnace can be high 650 ℃ of lower heat-insulating properties, and slowly heating, otherwise in the time of can causing heating, blank surface temperature and core temperature stress are large, cause crackle.1.4462 in ferrite content approximately 45%, ferrite and austenite plasticity inaccurate coordination, cause this material drag large.The condition of work of the critical component of centrifugal separator---rotary drum part (comprising rotary drum body, rotary drum lid, rotary drum retaining ring etc.) is high speed rotary, therefore requires its material to have higher comprehensive mechanical property.If the mechanical property of the stainless steel rotary drum body material of supercentrifuge is bad, fragility in use can occur suddenly disconnected.According to traditional production technology, centrifuge often adopts 1.4462 dual phase steel straight-flanked ring bases to be produced with the rotary drum forging.But due to 1.4462 dual phase steel plasticity extreme differences, easily distortion, also easily crack and pit, centrifuge has been produced to adverse effect with quality and the use of the forging of transferring shares.
Summary of the invention
The object of the present invention is to provide a kind of centrifuge manufacture method with the rotary drum forging, solved in the prior art and to have manufactured centrifuges with 1.4462 austenite-ferrite type stainless steels and easily crack the problem with pit with the rotary drum forging.
The manufacture method of rotary drum forging for a kind of centrifuge, it is characterized in that: when forging ring base, the forging shaped blank mainly comprises the following steps:
(1) blanking, heating:
By 1.4462 austenite-ferrite type stainless steel blank heating to 395～405 ℃ of insulation 115～125min, then be warming up to 595～605 ℃ of insulation 235～245min, then be warming up to 1155～1165 ℃ of insulation 345～355min;
(2) jumping-up, riveting upsetting:
After making it to be out of shape 30%～50%, jumping-up carries out the riveting upsetting, make external diameter slightly be with crowning, final forging temperature >=980 ℃, after jumping-up, blank is positioned over to upper and lower anvil with constant slope, the cylindrical corner angle of blank both ends of the surface are contacted with upper and lower anvil, property at parts of edges and corners is out of shape, is eliminated the distortion dead band, make blank finally form drum type simultaneously;
(3) heating, punching:
Be heated to 1160 ℃ and melt down while hot, be incubated 215～225min, with drift, to carry out punching to internal diameter be external diameter 40%～50%, and swollen hole to internal diameter is external diameter 50%～60%, final forging temperature >=980 ℃;
(4) heating, sub-material, reaming:
Be heated to 1160 ℃ and melt down while hot, be incubated 115～125min, with the sub-material saddle, the blank endoporus is carried out to sub-material, and reaming to internal diameter is external diameter 80%～90%, final forging temperature >=980 ℃;
(5) heating, saddle support reaming, heating, saddle support are shaped:
Be heated to 1160 ℃ and melt down while hot, be incubated 115～125min, by reaming saddle and frock, carry out the saddle support reaming, saddle support reaming to internal diameter is external diameter 90%～95%; Final forging temperature >=980 ℃, then be heated to 1160 ℃ and melt down while hot, be incubated 95～105min, use shaping saddle and frock to carry out the final reaming of saddle support and shaping, final forging temperature >=980 ℃;
(6) solution heat treatment, shaping, machine add:
1050 ℃ of insulation 335～345min carry out solution heat treatment, and water-cooled, form in the open die forging mode, during shaping in saddle support reaming process Robot actions suitable, use metal long cutting tool bar to carry out machine and add.
In described step (1), blank heating to 400 ℃ is incubated to 120min, then is warming up to 600 ℃ of insulation 240min, then be warming up to 1160 ℃ of insulation 350min.
In described step (3), temperature retention time is 220min.
In described step (4), temperature retention time is 120min.
Described step (5) is to be heated to 1160 ℃ to melt down while hot, and insulation 120min, carry out the saddle support reaming by reaming saddle and frock, and saddle support reaming to internal diameter is external diameter 93%; Final forging temperature >=980 ℃, then be heated to 1160 ℃ and melt down while hot, insulation 100min, used shaping saddle and frock to carry out the final reaming of saddle support and shaping, final forging temperature >=980 ℃.
In described step (6), temperature retention time is 340min.
Beneficial effect of the present invention: the simple rectangular bloom of forging no longer when forging ring base, but the shaped blank that forging and forging net shape are more pressed close to.In the stage of initial forging stock, because the sectional dimension of blank is larger, the temperature drop of blank can be lower, now can more sure forging ring base at higher temperature and do not produce too much crackle.In looping mill rolling process subsequently, because the profile of blank is comparatively approaching with the profile of final forging, so the deflection of each several part is also relatively even, avoid the excessive internal stress of the inner generation of material, thereby avoided the generation of crackle and hole, be equipped with rational rotary drum process for manufacturing forging again, effectively solved 1.4462 austenite-ferrite type stainless steel plasticity poor, the made centrifuge foundry goods of transferring shares easily is out of shape, cracks the difficult problem with hole.
The accompanying drawing explanation
Fig. 1 is flow chart of the present invention;
Fig. 2 is the sub-material saddle that in the present invention, the sub-material reaming is used;
Fig. 3 is the reaming saddle that in the present invention, the saddle support reaming is used;
Fig. 4 is the frock that in the present invention, the saddle support reaming is used;
Fig. 5 is the shaping saddle that in the present invention, the saddle support moulding is used;
Fig. 6 is the profile that in the present invention, final reaming becomes.
The specific embodiment
In order to deepen the understanding of the present invention, below in conjunction with drawings and Examples, the present invention is described in further detail, but do not form limiting the scope of the present invention.
1.4462 the stainless chemical composition of austenite-ferrite type is: C≤0.03, si=1.3～2.0, Mn=1.3～2.00, P≤0.035, S≤0.030, Ni=4.50～5.50, Cr=18.00～19.50, Mo=2.5～3.0, N=0.05～0.12.
As shown in Figure 1, flow process of the present invention comprises 1.4462 austenite-ferrite type stainless steel blank blankings, heating, jumping-up, riveting upsetting, heating, punching, heating, sub-material, reaming, heating, saddle support reaming, heating, saddle support are shaped, and solution heat treatment, shaping, machine add.The 1.4462 austenite-ferrite type stainless steel blanks that the specification of below take is Ф 500 * 1020 are described manufacture method provided by the invention in detail.
(1) blanking, heating:
The 1.4462 austenite-ferrite type stainless steel blank rounding R30 that are Ф 500 * 1020 by specification, be heated to 400 ℃, insulation 120min, then be warming up to 600 ℃ of insulation 240min, then be warming up to 1160 ℃ of insulation 350min;
(2) jumping-up, riveting upsetting:
Jumping-up carries out the riveting upsetting to H=562mm, makes external diameter slightly be with crowning; Final forging temperature >=980 ℃, after jumping-up, be positioned over upper and lower anvil by blank with constant slope, and the cylindrical corner angle of blank both ends of the surface are contacted with upper and lower anvil, and property at parts of edges and corners is out of shape, and eliminates the distortion dead band, makes blank finally form drum type simultaneously;
(3) heating, punching:
Be heated to 1160 ℃ and melt down while hot, insulation 220min, used the drift of Ф 200mm to carry out punching, and swollen hole is to Ф 280mm; Final forging temperature >=980 ℃;
(4) heating, sub-material, reaming:
Be heated to 1160 ℃ and melt down while hot, insulation 120min, with the sub-material saddle shown in Fig. 2, the blank endoporus is carried out to sub-material, and reaming is to Ф 300mm, final forging temperature >=980 ℃;
(5) heating, saddle support reaming, heating, saddle support are shaped:
Be heated to 1160 ℃ and melt down while hot, insulation 120min, carry out the saddle support reaming by the frock shown in the reaming saddle shown in Fig. 3 and Fig. 4, and the saddle support reaming is to Ф 550mm; Final forging temperature >=980 ℃, 1160 ℃ melt down while hot, and insulation 100min, used the shaping saddle shown in Fig. 5, and the frock shown in Fig. 4 carries out the final reaming of saddle support and shaping, and final profile is as Fig. 6, final forging temperature >=980 ℃;
(6) solution heat treatment, shaping, machine add:
With 1050 ℃ of insulation 340min, water-cooled, this part is shaped piece, radially area of section changes greatly, if during base, sub-material is inaccurate, forging is by utter failure, and form in the open die forging mode, forging concentric reducer size is not necessarily coordinated to put in place, during shaping in saddle support reaming process Robot actions improper, will cause internal diameter indentation, the defect such as folding, cause that material accumulates on internal diameter, wound arranged on internal diameter, cause the external diameter misrun, because the roughing shape is darker at the internal diameter upper groove, the machine added-time must be used metal long cutting tool bar.
Standards such as GB/T10901-2005 " centrifuge performance test methods ", JB/T9095 " centrifuge, seperator smithwelding part conventional Non-Destructive Testing " by reference, after testing, adopt the centrifuge rotary drum forging of the inventive method manufacturing, meet the relevant criterion of regulation in JB/T10411-2004 " centrifuge, seperator austenitic steel forging ultrasound detection and quality grading " and GB/T285695-2012 " bowl intensity is calculated standard "; It is not yielding, be difficult for cracking and hole, and combination property is better than the rotary drum forging that available technology adopting 1.4462 dual phase steel straight-flanked ring bases are produced.The manufacture method of rotary drum forging for a kind of centrifuge of the present invention, meet the relevant regulations in JB8525-1997 " centrifuge safety requirements ".The centrifuge that adopts the made centrifuge of the present invention to produce with the rotary drum forging, its security performance meets the relevant regulations standard in JB8525-1997 " centrifuge safety requirements ".
Embodiment 1
(1) blanking, heating:
By 1.4462 austenite-ferrite type stainless steel blank heating to 395 ℃ insulation 115min, then be warming up to 595 ℃ of insulation 235min, then be warming up to 1155 ℃ of insulation 345min;
(2) jumping-up, riveting upsetting:
After making it to be out of shape 30%, jumping-up carries out the riveting upsetting, make external diameter slightly be with crowning, final forging temperature >=980 ℃, after jumping-up, blank is positioned over to upper and lower anvil with constant slope, the cylindrical corner angle of blank both ends of the surface are contacted with upper and lower anvil, property at parts of edges and corners is out of shape, is eliminated the distortion dead band, make blank finally form drum type simultaneously;
(3) heating, punching:
Be heated to 1160 ℃ and melt down while hot, insulation 215min, with drift, to carry out punching to internal diameter be external diameter 40%, swollen hole to internal diameter is external diameter 50%, final forging temperature >=980 ℃;
(4) heating, sub-material, reaming:
Be heated to 1160 ℃ and melt down while hot, be incubated 115, with the sub-material saddle, the blank endoporus is carried out to sub-material, and reaming to internal diameter is external diameter 80%, final forging temperature >=980 ℃;
(5) heating, saddle support reaming, heating, saddle support are shaped:
Be heated to 1160 ℃ and melt down while hot, be incubated 115, by reaming saddle and frock, carry out the saddle support reaming, saddle support reaming to internal diameter is external diameter 90%; Final forging temperature >=980 ℃, then be heated to 1160 ℃ and melt down while hot, be incubated 95, use shaping saddle and frock to carry out the final reaming of saddle support and shaping, final forging temperature >=980 ℃;
(6) solution heat treatment, shaping, machine add:
Carry out solution heat treatment with 1050 ℃ of insulation 335min, water-cooled, form in the open die forging mode, during shaping in saddle support reaming process Robot actions suitable, use metal long cutting tool bar to carry out machine and add.
Embodiment 2
(1) blanking, heating:
By 1.4462 austenite-ferrite type stainless steel blank heating to 405 ℃ insulation 125min, then be warming up to 605 ℃ of insulation 245min, then be warming up to 1165 ℃ of insulation 355min;
(2) jumping-up, riveting upsetting:
After making it to be out of shape 50%, jumping-up carries out the riveting upsetting, make external diameter slightly be with crowning, final forging temperature >=980 ℃, after jumping-up, blank is positioned over to upper and lower anvil with constant slope, the cylindrical corner angle of blank both ends of the surface are contacted with upper and lower anvil, property at parts of edges and corners is out of shape, is eliminated the distortion dead band, make blank finally form drum type simultaneously;
(3) heating, punching:
Be heated to 1160 ℃ and melt down while hot, insulation 225min, with drift, to carry out punching to internal diameter be external diameter 50%, swollen hole to internal diameter is external diameter 60%, final forging temperature >=980 ℃;
(4) heating, sub-material, reaming:
Be heated to 1160 ℃ and melt down while hot, insulation 125min, carry out sub-material with the sub-material saddle to the blank endoporus, and reaming to internal diameter is external diameter 90%, final forging temperature >=980 ℃;
(5) heating, saddle support reaming, heating, saddle support are shaped:
Be heated to 1160 ℃ and melt down while hot, insulation 125min, carry out the saddle support reaming by reaming saddle and frock, and saddle support reaming to internal diameter is external diameter 95%; Final forging temperature >=980 ℃, then be heated to 1160 ℃ and melt down while hot, insulation 105min, used shaping saddle and frock to carry out the final reaming of saddle support and shaping, final forging temperature >=980 ℃;
(6) solution heat treatment, shaping, machine add:
Carry out solution heat treatment with 1050 ℃ of insulation 345min, water-cooled, form in the open die forging mode, during shaping in saddle support reaming process Robot actions suitable, use metal long cutting tool bar to carry out machine and add.
Embodiment 3
(1) blanking, heating:
By 1.4462 austenite-ferrite type stainless steel blank heating to 400 ℃ insulation 120min, then be warming up to 600 ℃ of insulation 240min, then be warming up to 1160 ℃ of insulation 350min;
(2) jumping-up, riveting upsetting:
After making it to be out of shape 40%, jumping-up carries out the riveting upsetting, make external diameter slightly be with crowning, final forging temperature >=980 ℃, after jumping-up, blank is positioned over to upper and lower anvil with constant slope, the cylindrical corner angle of blank both ends of the surface are contacted with upper and lower anvil, property at parts of edges and corners is out of shape, is eliminated the distortion dead band, make blank finally form drum type simultaneously;
(3) heating, punching:
Be heated to 1160 ℃ and melt down while hot, insulation 220min, with drift, to carry out punching to internal diameter be external diameter 45%, swollen hole to internal diameter is external diameter 55%, final forging temperature >=980 ℃;
(4) heating, sub-material, reaming:
Be heated to 1160 ℃ and melt down while hot, insulation 120min, carry out sub-material with the sub-material saddle to the blank endoporus, and reaming to internal diameter is external diameter 85%, final forging temperature >=980 ℃;
(5) heating, saddle support reaming, heating, saddle support are shaped:
Be heated to 1160 ℃ and melt down while hot, insulation 120min, carry out the saddle support reaming by reaming saddle and frock, and saddle support reaming to internal diameter is external diameter 92.5%; Final forging temperature >=980 ℃, then be heated to 1160 ℃ and melt down while hot, insulation 100min, used shaping saddle and frock to carry out the final reaming of saddle support and shaping, final forging temperature >=980 ℃;
(6) solution heat treatment, shaping, machine add:
Carry out solution heat treatment with 1050 ℃ of insulation 340min, water-cooled, form in the open die forging mode, during shaping in saddle support reaming process Robot actions suitable, use metal long cutting tool bar to carry out machine and add.
Claims (6)
1. the manufacture method of rotary drum forging for a centrifuge, it is characterized in that: when forging ring base, the forging shaped blank mainly comprises the following steps:
(1) blanking, heating:
By 1.4462 austenite-ferrite type stainless steel blank heating to 395～405 ℃ of insulation 115～125min, then be warming up to 595～605 ℃ of insulation 235～245min, then be warming up to 1155～1165 ℃ of insulation 345～355min;
(2) jumping-up, riveting upsetting:
After making it to be out of shape 30%～50%, jumping-up carries out the riveting upsetting, make external diameter slightly be with crowning, final forging temperature >=980 ℃, after jumping-up, blank is positioned over to upper and lower anvil with constant slope, the cylindrical corner angle of blank both ends of the surface are contacted with upper and lower anvil, property at parts of edges and corners is out of shape, is eliminated the distortion dead band, make blank finally form drum type simultaneously;
(3) heating, punching:
Be heated to 1160 ℃ and melt down while hot, be incubated 215～225min, with drift, to carry out punching to internal diameter be external diameter 40%～50%, and swollen hole to internal diameter is external diameter 50%～60%, final forging temperature >=980 ℃;
(4) heating, sub-material, reaming:
Be heated to 1160 ℃ and melt down while hot, be incubated 115～125min, with the sub-material saddle, the blank endoporus is carried out to sub-material, and reaming to internal diameter is external diameter 80%～90%, final forging temperature >=980 ℃;
(5) heating, saddle support reaming, heating, saddle support are shaped:
Be heated to 1160 ℃ and melt down while hot, be incubated 115～125min, by reaming saddle and frock, carry out the saddle support reaming, saddle support reaming to internal diameter is external diameter 90%～95%; Final forging temperature >=980 ℃, then be heated to 1160 ℃ and melt down while hot, be incubated 95～105min, use shaping saddle and frock to carry out the final reaming of saddle support and shaping, final forging temperature >=980 ℃;
(6) solution heat treatment, shaping, machine add:
1050 ℃ of insulation 335～345min carry out solution heat treatment, and water-cooled, form in the open die forging mode, during shaping in saddle support reaming process Robot actions suitable, use metal long cutting tool bar to carry out machine and add.
2. the manufacture method of rotary drum forging for a kind of centrifuge according to claim 1, is characterized in that: in described step (1), blank heating to 400 ℃ is incubated to 120min, then is warming up to 600 ℃ of insulation 240min, then be warming up to 1160 ℃ of insulation 350min.
3. use the manufacture method of rotary drum forging according to the arbitrary described a kind of centrifuge of claim 1～2, it is characterized in that: in described step (3), temperature retention time is 220min.
4. the manufacture method of rotary drum forging for a kind of centrifuge according to claim 3, it is characterized in that: in described step (4), temperature retention time is 120min.
5. the manufacture method of rotary drum forging for a kind of centrifuge according to claim 1, it is characterized in that: described step (5) is to be heated to 1160 ℃ to melt down while hot, insulation 120min, carry out the saddle support reaming by reaming saddle and frock, and saddle support reaming to internal diameter is external diameter 93%; Final forging temperature >=980 ℃, then be heated to 1160 ℃ and melt down while hot, insulation 100min, used shaping saddle and frock to carry out the final reaming of saddle support and shaping, final forging temperature >=980 ℃.
6. the manufacture method of rotary drum forging for a kind of centrifuge according to claim 1, it is characterized in that: in described step (6), temperature retention time is 340min.
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| CN104294021A (en) * | 2014-10-24 | 2015-01-21 | 无锡市派克重型铸锻有限公司 | Duplex stainless steel forging and molding process |
| CN104690199A (en) * | 2015-03-16 | 2015-06-10 | 宝鸡石油机械有限责任公司 | Free forging method for blowout preventer body used for petroleum drilling and production |
| CN105728613A (en) * | 2014-12-12 | 2016-07-06 | 陕西宏远航空锻造有限责任公司 | Free forging method of n-shaped forge piece |
| CN106391952A (en) * | 2016-08-31 | 2017-02-15 | 无锡派克新材料科技股份有限公司 | Saddle-shaped broaching core bar and broaching method thereof |
| CN106825344A (en) * | 2017-02-16 | 2017-06-13 | 哈尔滨汽轮机厂有限责任公司 | A kind of free forging method that male sportsman sealing ring is realized using 1 ton of flat-die hammer |
| CN110976745A (en) * | 2019-12-19 | 2020-04-10 | 陕西宏远航空锻造有限责任公司 | Punch and method for forging ring-shaped piece by using punch |
| CN112481565A (en) * | 2020-11-12 | 2021-03-12 | 贵州航宇科技发展股份有限公司 | Forging method of Waspaloy alloy |
| CN113967718A (en) * | 2021-10-22 | 2022-01-25 | 重庆新承航锐科技股份有限公司 | Method for improving grain size of ferrite stainless steel annular forging |
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| CN102172757A (en) * | 2010-12-28 | 2011-09-07 | 通裕重工股份有限公司 | Hole-reaming forming technology for internal and external specially-shaped surfaces |
| CN202963336U (en) * | 2012-10-12 | 2013-06-05 | 中航卓越锻造（无锡）有限公司 | Special-shaped ring forging die |
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| CN104294021B (en) * | 2014-10-24 | 2016-05-25 | 无锡市派克重型铸锻有限公司 | A kind of two phase stainless steel forging molding process |
| CN105728613A (en) * | 2014-12-12 | 2016-07-06 | 陕西宏远航空锻造有限责任公司 | Free forging method of n-shaped forge piece |
| CN104690199A (en) * | 2015-03-16 | 2015-06-10 | 宝鸡石油机械有限责任公司 | Free forging method for blowout preventer body used for petroleum drilling and production |
| CN104690199B (en) * | 2015-03-16 | 2016-08-24 | 宝鸡石油机械有限责任公司 | The free forging method of petroleum drilling and mining blowout preventer body |
| CN106391952A (en) * | 2016-08-31 | 2017-02-15 | 无锡派克新材料科技股份有限公司 | Saddle-shaped broaching core bar and broaching method thereof |
| CN106825344A (en) * | 2017-02-16 | 2017-06-13 | 哈尔滨汽轮机厂有限责任公司 | A kind of free forging method that male sportsman sealing ring is realized using 1 ton of flat-die hammer |
| CN110976745A (en) * | 2019-12-19 | 2020-04-10 | 陕西宏远航空锻造有限责任公司 | Punch and method for forging ring-shaped piece by using punch |
| CN110976745B (en) * | 2019-12-19 | 2022-05-27 | 陕西宏远航空锻造有限责任公司 | Punch and method for forging ring-shaped piece by using punch |
| CN112481565A (en) * | 2020-11-12 | 2021-03-12 | 贵州航宇科技发展股份有限公司 | Forging method of Waspaloy alloy |
| CN113967718A (en) * | 2021-10-22 | 2022-01-25 | 重庆新承航锐科技股份有限公司 | Method for improving grain size of ferrite stainless steel annular forging |
| CN113967718B (en) * | 2021-10-22 | 2024-03-12 | 重庆新承航锐科技股份有限公司 | Method for improving grain size of ferrite stainless steel annular forging |
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