CN109681507A - A kind of nonstandard nut bolt structure and its processing technology - Google Patents
A kind of nonstandard nut bolt structure and its processing technology Download PDFInfo
- Publication number
- CN109681507A CN109681507A CN201811636521.0A CN201811636521A CN109681507A CN 109681507 A CN109681507 A CN 109681507A CN 201811636521 A CN201811636521 A CN 201811636521A CN 109681507 A CN109681507 A CN 109681507A
- Authority
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- China
- Prior art keywords
- bolt
- type
- nut
- punching press
- scholar
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000012545 processing Methods 0.000 title claims description 8
- 238000005516 engineering process Methods 0.000 title claims description 6
- 238000004080 punching Methods 0.000 claims abstract description 46
- 238000000034 method Methods 0.000 claims abstract description 22
- 239000002994 raw material Substances 0.000 claims abstract description 21
- 238000003466 welding Methods 0.000 claims description 25
- 239000000047 product Substances 0.000 claims description 17
- 238000000465 moulding Methods 0.000 claims description 16
- 238000005496 tempering Methods 0.000 claims description 9
- 238000004146 energy storage Methods 0.000 claims description 8
- 229910002651 NO3 Inorganic materials 0.000 claims description 6
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000002791 soaking Methods 0.000 claims description 6
- 238000005096 rolling process Methods 0.000 claims description 5
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000010273 cold forging Methods 0.000 claims description 3
- 229910052961 molybdenite Inorganic materials 0.000 claims description 3
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 claims description 3
- 229910052982 molybdenum disulfide Inorganic materials 0.000 claims description 3
- 239000003921 oil Substances 0.000 claims description 3
- 238000005554 pickling Methods 0.000 claims description 3
- 238000012805 post-processing Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000003672 processing method Methods 0.000 claims description 3
- 238000010791 quenching Methods 0.000 claims description 3
- 230000000171 quenching effect Effects 0.000 claims description 3
- 239000011265 semifinished product Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 2
- 238000003860 storage Methods 0.000 claims 1
- 239000002699 waste material Substances 0.000 abstract description 16
- 238000004519 manufacturing process Methods 0.000 abstract description 13
- 239000000463 material Substances 0.000 abstract description 8
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract 1
- 238000005194 fractionation Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008520 organization Effects 0.000 description 2
- 238000009966 trimming Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B37/00—Nuts or like thread-engaging members
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
The invention discloses a kind of nonstandard nut bolt structures, including " scholar " type bolt and " work " type nut, upper fixing sleeve is equipped with bolt punching press washer on the outside of " scholar " type bolt, beneficial effects of the present invention are as follows: improving production efficiency: solving the problems, such as that this kind of part must use turning process, greatly improve production efficiency, turning efficiency is probably in 60S/ part at present, and current punching press and cold-heading is substantially in 5S/ part；Material loss is reduced, if selecting former integral design, raw material selection size can be bigger, by can largely save the use of former material after fractionation structure, reduces waste.Stock utilization basically reaches 95% or more.Original design turning process can waste more raw material；Environmental protection, which generates without waste residue waste product substantially in process of production, very environmentally friendly, and former design structure can use many turning liquid in process of production, and the generation such as turning waste material has pollution to environment.
Description
Technical field
The invention discloses a kind of nonstandard nut bolt structure more particularly to a kind of nonstandard nut bolt structure and its processing
Technique belongs to automobile assembling part field.
Background technique
Automobile, which is molded class exterior trimming parts and assembles with car body, be unable to do without bolt, nut.These bolts, nut generally use " scholar " type
Or " work " type assembles with the Doghouse of moulding, the design of this kind of product generally uses same material integral design at present,
Result in this kind of part without image of Buddha other standards part bolt in this way, nut uses cold-heading, and thread rolling technique is done directly processing.At present
Process be first cold-heading in the last thread rolling of turning, or even what is had all processed using turning process.Turning process greatly promotes
Product cost, there are low efficiency, manufacture material waste is big, scrap mostly not environmentally the problem of.The invention of this structure design will solve
Certainly former design cost is high, low efficiency and not environmentally the problem of, discard this kind of product and process the turning process kept away not open.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of nonstandard nut bolt structure and its processing technology, to solve
The above problem.
To achieve the above object, the invention provides the following technical scheme: a kind of nonstandard nut bolt structure, including " scholar " type
Bolt and " work " type nut, the upper fixing sleeve in " scholar " type bolt outside are equipped with bolt punching press washer, " work " the type nut one
End is fixedly connected with nut punching press washer.
Preferably, the bolt punching press gasket diameters are greater than the diameter of " scholar " type bolt, the nut punching press washer is straight
Diameter is greater than the diameter of " work " type nut.
A kind of processing technology of nonstandard nut bolt structure, the processing method in turn include the following steps:
A selects different raw materials according to produce different products；
B stock, selects suitable cold-forging steel as nuts and bolt raw material；
C pretreatment of raw material: by nuts and bolt raw material carry out surface preparation, specially pickling → washing → cold-drawn → phosphatization →
Cleaning → oscillator applies MoS2；
D cold-heading molding: cold-heading molding is carried out to pretreated raw material using three station cold headers, by logical after each station molding
No-go gage verifies screw thread, the last one station carries out thread rolling to bolt and operates to form semi-finished product；
E quenching, quenches molding nuts and bolt in nitrate furnace, and control hardening heat is 840~855 DEG C, heating
Time is 6~8min, and soaking time is 60~70min；
F tempering, is tempered molding nuts and bolt in nitrate furnace, and control tempering temperature is 520~570 DEG C, heating
Time is 66~70min, and soaking time is 95~100min；
G blacks, and the nuts and bolt after part tempering, which enters, carries out blackening process in blackening agent for surface；
H post-processing, to step f, treated that nuts and bolt is dried, and oils, dry to be formed final " scholar " type bolt and
" work " type nut；
I punching press carries out stamping process to bolt punching press washer and nut punching press washer using press machine；
J presses flange link, such as " scholar " type bolt and cooperation of " work " the type nut in doghouse be loosen by tension not
Greatly, can directly by clearance fit design or Interference Fit Design, last " work " type nut, nut punching press washer respectively and
" scholar " type bolt, bolt punching press washer pressing flange complete product；
The link of k electric resistance welding, design gaps cooperation or interference fit finally also need to adopt if short transverse tension after assembly is very big
The link of two parts is completed with electric resistance welding (butt-joint), which in turn includes the following steps:
K1. " scholar " type bolt and " work " type nut are selected to weld ontology；
K2. punching press washer is installed on " scholar " type bolt and " work " type nut body；
K3. it is sent into after installing on the clamp tool of energy storage type resistance welding machine；
K4. start energy storage type resistance welding machine, punching press washer and " scholar " type bolt and bolt punching press washer are passed through into energy storage electric
Welding resistance picks welding, and by punching press washer and " scholar " type bolt and bolt stamping pad circle firm welding, wherein weldingvoltage is 250V-
300V, contribute 1500N-2500N；
K5. after the completion of welding, clamp tool is removed, product is taken out from clamp tool, product completes.
Compared with prior art, beneficial effects of the present invention are as follows:
1) improving production efficiency: solve the problems, such as that this kind of part must greatly improve production efficiency, mesh using turning process
Preceding turning efficiency is probably in 60S/ part, and current punching press and cold-heading is substantially in 5S/ part；
2) reduce material loss: if selecting former integral design, raw material selection size can be bigger, after splitting structure
The use of former material can be largely saved, waste is reduced.Stock utilization basically reaches 95% or more.Original design turning work
Skill can waste more raw material；
3) environmentally friendly: the design organization is generated without waste residue waste product substantially in process of production, very environmentally friendly, and former design structure is in life
Many turning liquid can be used during production, the generation such as turning waste material has pollution to environment.
Detailed description of the invention
Fig. 1 is the split-type design structural schematic diagram of bolt of the present invention；
Fig. 2 is the split-type design structural schematic diagram of nut of the present invention；
Fig. 3 is present invention bolt integral design structural schematic diagram at present；
Fig. 4 is present invention nut integral design structural schematic diagram at present.
In figure: 1, " scholar " type bolt；2, bolt punching press washer；3, " work " type nut；4, nut punching press washer.
Specific embodiment
The following is a clear and complete description of the technical scheme in the embodiments of the invention, it is clear that described embodiment
Only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, the common skill in this field
Art personnel every other embodiment obtained without making creative work belongs to the model that the present invention protects
It encloses.
A kind of nonstandard nut bolt structure, including " scholar " type bolt 1 and " work " type nut 3,1 outside of " scholar " type bolt
Upper fixing sleeve is equipped with bolt punching press washer 2, and described 3 one end of " work " type nut is fixedly connected with nut punching press washer 4.
Wherein, 2 diameter of bolt punching press washer is greater than the diameter of " scholar " type bolt 1,4 diameter of nut punching press washer
Greater than the diameter of " work " type nut 3.
A kind of processing technology of nonstandard nut bolt structure, the processing method in turn include the following steps:
A selects different raw materials according to produce different products；
B stock, selects suitable cold-forging steel as nuts and bolt raw material；
C pretreatment of raw material: by nuts and bolt raw material carry out surface preparation, specially pickling → washing → cold-drawn → phosphatization →
Cleaning → oscillator applies MoS2；
D cold-heading molding: cold-heading molding is carried out to pretreated raw material using three station cold headers, by logical after each station molding
No-go gage verifies screw thread, the last one station carries out thread rolling to bolt and operates to form semi-finished product；
E quenching, quenches molding nuts and bolt in nitrate furnace, and control hardening heat is 840~855 DEG C, heating
Time is 6~8min, and soaking time is 60~70min；
F tempering, is tempered molding nuts and bolt in nitrate furnace, and control tempering temperature is 520~570 DEG C, heating
Time is 66~70min, and soaking time is 95~100min；
G blacks, and the nuts and bolt after part tempering, which enters, carries out blackening process in blackening agent for surface；
H post-processing, to step f, treated that nuts and bolt is dried, and oils, and dries to form final 1 He of " scholar " type bolt
" work " type nut 3；
I punching press carries out stamping process to bolt punching press washer 2 and nut punching press washer 4 using press machine；
J presses flange link, and such as " scholar " type bolt 1 and cooperation of " work " the type nut 3 in doghouse are loosened by tension
Less, can be directly by clearance fit design or Interference Fit Design, last " work " type nut 3, nut punching press washer 4 are distinguished
" scholar " type bolt 1, bolt punching press washer 2 press flange and complete product；
The link of k electric resistance welding, design gaps cooperation or interference fit finally also need to adopt if short transverse tension after assembly is very big
The link of two parts is completed with electric resistance welding (butt-joint), which in turn includes the following steps:
K1. " scholar " type bolt 1 and " work " type nut 3 are selected to weld ontology；
K2. punching press washer is installed on " scholar " type bolt 1 and 3 ontology of " work " type nut；
K3. it is sent into after installing on the clamp tool of energy storage type resistance welding machine；
K4. start energy storage type resistance welding machine, punching press washer and " scholar " type bolt 1 and bolt punching press washer 2 are passed through into energy storage type
Resistance welding machine welding, by punching press washer and 2 firm welding of " scholar " type bolt 1 and bolt punching press washer, wherein weldingvoltage is
250V-300V, contribute 1500N-2500N；
K5. after the completion of welding, clamp tool is removed, product is taken out from clamp tool, product completes.
Compared with prior art, beneficial effects of the present invention are as follows:
1) improving production efficiency: solve the problems, such as that this kind of part must greatly improve production efficiency, mesh using turning process
Preceding turning efficiency is probably in 60S/ part, and current punching press and cold-heading is substantially in 5S/ part；
2) reduce material loss: if selecting former integral design, raw material selection size can be bigger, after splitting structure
The use of former material can be largely saved, waste is reduced.Stock utilization basically reaches 95% or more.Original design turning work
Skill can waste more raw material；
3) environmentally friendly: the design organization is generated without waste residue waste product substantially in process of production, very environmentally friendly, and former design structure is in life
Many turning liquid can be used during production, the generation such as turning waste material has pollution to environment.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (3)
1. a kind of nonstandard nut bolt structure, it is characterised in that: described including " scholar " type bolt (1) and " work " type nut (3)
Fixing sleeve is equipped with bolt punching press washer (2) on " scholar " type bolt (1) outside, and described " work " type nut (3) one end is fixedly connected with
Nut punching press washer (4).
2. a kind of nonstandard nut bolt structure according to claim 1, it is characterised in that: the bolt punching press washer (2)
Diameter is greater than the diameter of " scholar " type bolt (1), and nut punching press washer (4) diameter is greater than the diameter of " work " type nut (3).
3. a kind of processing technology of nonstandard nut bolt structure, it is characterised in that: the processing method in turn includes the following steps:
A selects different raw materials according to produce different products；
B stock, selects suitable cold-forging steel as nuts and bolt raw material；
C pretreatment of raw material: by nuts and bolt raw material carry out surface preparation, specially pickling → washing → cold-drawn → phosphatization →
Cleaning → oscillator applies MoS2；
D cold-heading molding: cold-heading molding is carried out to pretreated raw material using three station cold headers, by logical after each station molding
No-go gage verifies screw thread, the last one station carries out thread rolling to bolt and operates to form semi-finished product；
E quenching, quenches molding nuts and bolt in nitrate furnace, and control hardening heat is 840~855 DEG C, heating
Time is 6~8min, and soaking time is 60~70min；
F tempering, is tempered molding nuts and bolt in nitrate furnace, and control tempering temperature is 520~570 DEG C, heating
Time is 66~70min, and soaking time is 95~100min；
G blacks, and the nuts and bolt after part tempering, which enters, carries out blackening process in blackening agent for surface；
H post-processing, to step f, treated that nuts and bolt is dried, and oils, and dries to form final " scholar " type bolt (1)
" work " type nut (3)；
I punching press carries out stamping process to bolt punching press washer (2) and nut punching press washer (4) using press machine；
J press flange link, such as the cooperation of " scholar " type bolt (1) and " work " type nut (3) in doghouse be loosening by
Tension is little, can directly pass through clearance fit design or Interference Fit Design, last " work " type nut (3), nut stamping pad
It encloses (4) respectively and " scholar " type bolt (1), bolt punching press washer (2) pressing flange completes product；
The link of k electric resistance welding, design gaps cooperation or interference fit finally also need to adopt if short transverse tension after assembly is very big
The link of two parts is completed with electric resistance welding (butt-joint), which in turn includes the following steps:
K1. " scholar " type bolt (1) and " work " type nut (3) are selected to weld ontology；
K2. punching press washer is installed on " scholar " type bolt (1) and " work " type nut (3) ontology；
K3. it is sent into after installing on the clamp tool of energy storage type resistance welding machine；
K4. start energy storage type resistance welding machine, punching press washer and " scholar " type bolt (1) and bolt punching press washer (2) are passed through into storage
Energy formula resistance welding machine welding, by punching press washer and " scholar " type bolt (1) and bolt punching press washer (2) firm welding, wherein welding
Connecing voltage is 250V-300V, and contribute 1500N-2500N；
K5. after the completion of welding, clamp tool is removed, product is taken out from clamp tool, product completes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811636521.0A CN109681507A (en) | 2018-12-29 | 2018-12-29 | A kind of nonstandard nut bolt structure and its processing technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811636521.0A CN109681507A (en) | 2018-12-29 | 2018-12-29 | A kind of nonstandard nut bolt structure and its processing technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109681507A true CN109681507A (en) | 2019-04-26 |
Family
ID=66191257
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811636521.0A Pending CN109681507A (en) | 2018-12-29 | 2018-12-29 | A kind of nonstandard nut bolt structure and its processing technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109681507A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114183449A (en) * | 2022-01-10 | 2022-03-15 | 日泰（上海）汽车标准件有限公司 | Combined welding bolt assembly and preparation method thereof |
| CN114233737A (en) * | 2022-01-10 | 2022-03-25 | 日泰（上海）汽车标准件有限公司 | Integrated welded nut and preparation method thereof |
| CN116586923A (en) * | 2023-07-14 | 2023-08-15 | 成都迈特航空制造有限公司 | Manufacturing method of lightning protection nut assembly with gasket ring sleeve |
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| EP0058252A1 (en) * | 1981-02-18 | 1982-08-25 | WEGU Gummi- und Kunststoffwerke Walter Dräbing KG | Fastener for a vehicle floor mat |
| KR20030015659A (en) * | 2001-08-17 | 2003-02-25 | 현대자동차주식회사 | Clip structure for fixing trim of automobile |
| JP2005350045A (en) * | 2004-05-11 | 2005-12-22 | Taisei Seisakusho:Kk | License plate protector |
| DE202009017009U1 (en) * | 2009-12-16 | 2010-04-15 | Newfrey Llc, Newark | Joining tool and holding device for it |
| KR200448818Y1 (en) * | 2007-12-28 | 2010-05-26 | 한국건설기술연구원 | Extensional type high tension bolts assembly |
| CN102996607A (en) * | 2011-09-16 | 2013-03-27 | 上海通用汽车有限公司 | Gasket assembly for automotive fastener |
| CN204025290U (en) * | 2014-08-19 | 2014-12-17 | 瑞标集团有限公司 | A kind of nut of belt washer |
| CN204397150U (en) * | 2014-12-12 | 2015-06-17 | 上海交运汽车精密冲压件有限公司 | A kind of Working piece positioning device for electric resistance welding |
| CN204937006U (en) * | 2015-09-08 | 2016-01-06 | 北京长城华冠汽车科技股份有限公司 | A kind of automobile rear license plate trim board and the automobile comprising this rear licence plate trim board |
| CN206054497U (en) * | 2016-09-29 | 2017-03-29 | 宁波方太厨具有限公司 | A kind of fastening combined piece |
| CN107414012A (en) * | 2017-07-21 | 2017-12-01 | 南通安赛乐紧固件有限公司 | A kind of cold-heading molding technique of big hexagon head bolt |
| CN207997828U (en) * | 2018-03-26 | 2018-10-23 | 长城汽车股份有限公司 | A kind of automotive trim strip mounting structure and automobile |
-
2018
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|---|---|---|---|---|
| EP0058252A1 (en) * | 1981-02-18 | 1982-08-25 | WEGU Gummi- und Kunststoffwerke Walter Dräbing KG | Fastener for a vehicle floor mat |
| KR20030015659A (en) * | 2001-08-17 | 2003-02-25 | 현대자동차주식회사 | Clip structure for fixing trim of automobile |
| JP2005350045A (en) * | 2004-05-11 | 2005-12-22 | Taisei Seisakusho:Kk | License plate protector |
| KR200448818Y1 (en) * | 2007-12-28 | 2010-05-26 | 한국건설기술연구원 | Extensional type high tension bolts assembly |
| DE202009017009U1 (en) * | 2009-12-16 | 2010-04-15 | Newfrey Llc, Newark | Joining tool and holding device for it |
| CN102996607A (en) * | 2011-09-16 | 2013-03-27 | 上海通用汽车有限公司 | Gasket assembly for automotive fastener |
| CN204025290U (en) * | 2014-08-19 | 2014-12-17 | 瑞标集团有限公司 | A kind of nut of belt washer |
| CN204397150U (en) * | 2014-12-12 | 2015-06-17 | 上海交运汽车精密冲压件有限公司 | A kind of Working piece positioning device for electric resistance welding |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114183449A (en) * | 2022-01-10 | 2022-03-15 | 日泰（上海）汽车标准件有限公司 | Combined welding bolt assembly and preparation method thereof |
| CN114233737A (en) * | 2022-01-10 | 2022-03-25 | 日泰（上海）汽车标准件有限公司 | Integrated welded nut and preparation method thereof |
| CN116586923A (en) * | 2023-07-14 | 2023-08-15 | 成都迈特航空制造有限公司 | Manufacturing method of lightning protection nut assembly with gasket ring sleeve |
| CN116586923B (en) * | 2023-07-14 | 2023-10-24 | 成都迈特航空制造有限公司 | Manufacturing method of lightning protection nut assembly with gasket ring sleeve |
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Application publication date: 20190426 |
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