CN104439984A - Machining process of aviation screw - Google Patents
Machining process of aviation screw Download PDFInfo
- Publication number
- CN104439984A CN104439984A CN201410778783.6A CN201410778783A CN104439984A CN 104439984 A CN104439984 A CN 104439984A CN 201410778783 A CN201410778783 A CN 201410778783A CN 104439984 A CN104439984 A CN 104439984A
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- aviation
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- 238000003754 machining Methods 0.000 title abstract 3
- 238000005554 pickling Methods 0.000 claims abstract description 10
- 238000000137 annealing Methods 0.000 claims abstract description 7
- 239000000047 product Substances 0.000 claims description 21
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 18
- 239000006227 byproduct Substances 0.000 claims description 12
- 238000005516 engineering process Methods 0.000 claims description 11
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000000465 moulding Methods 0.000 claims description 9
- 238000007493 shaping process Methods 0.000 claims description 9
- 239000011701 zinc Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 8
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 6
- 238000004080 punching Methods 0.000 claims description 6
- 239000000344 soap Substances 0.000 claims description 6
- 239000000758 substrate Substances 0.000 claims description 6
- 238000005496 tempering Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 229910052725 zinc Inorganic materials 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 4
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 3
- 229910001297 Zn alloy Inorganic materials 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 claims description 3
- 210000000981 epithelium Anatomy 0.000 claims description 3
- 238000010304 firing Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- KFZAUHNPPZCSCR-UHFFFAOYSA-N iron zinc Chemical compound [Fe].[Zn] KFZAUHNPPZCSCR-UHFFFAOYSA-N 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 235000006408 oxalic acid Nutrition 0.000 claims description 3
- 238000002161 passivation Methods 0.000 claims description 3
- 238000004381 surface treatment Methods 0.000 claims description 3
- 238000010792 warming Methods 0.000 claims description 3
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 claims description 3
- 229910000165 zinc phosphate Inorganic materials 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 abstract 1
- 239000010959 steel Substances 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 3
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention discloses a machining process of an aviation screw. The machining process includes the steps of firstly, making a rolled steel wire; secondly, annealing; thirdly, pickling; fourthly, thread drawing; fifthly, forming; sixthly, threading; seventhly, thermal processing; eighthly, surface processing. The aviation screw machined by the process is wear resistant, high in strength, good in toughness, less prone to damage and long in service life.
Description
Technical field
The present invention relates to connection fastener areas, be specifically related to a kind of processing technology of aviation screw.
Background technology
Along with the development of aerospace field, the requirement of the material that aerospace field uses in user demand constantly improves, and in order to the demand of adapt to development, the material used is also in continuous renewal.Instantly, the screw of use in process of production, adopts lathe directly raw material car to be become screw mostly, cannot meet the user demand of aerospace field in using, production method produces the intensity difference of screw instantly, easily damages, service life is short, and result of use is poor.Therefore, need a kind of new production method to reach the index needed for use.
Summary of the invention
The object of the present invention is to provide a kind of aviation use, wear-resistant, intensity is high, good toughness, not fragile, the processing technology of the aviation screw of long service life.
Technical scheme of the present invention is, a kind of processing technology of aviation screw, comprises the steps:
1) dish unit: go out to buy original disc bar as base material from raw material business;
2) anneal: need hang in stove by product to be processed, and tight lid bell, in-furnace temperature is slowly risen to about 700 DEG C, and keeps 6-7 hour at this temperature, afterwards in-furnace temperature is slowly down to 500 DEG C, then cools to normal temperature with the furnace;
3) pickling: the whole dish unit after annealing is immersed in the hydrochloric acid trough of normal temperature respectively, continue to put into multiple hydrochloric acid trough, until the oxide-film that removing dish unit is surperficial completely, put into clear water afterwards, remove the hcl corrosion product of wire surface, then put into oxalic acid, increase the activity of metal, finally will coil unit to immerse in zinc phosphate solution, substrate surface is contacted with treatment fluid, and base material dissolves generates insoluble Zn
2fe(PO
4)
24H
2o, is attached to substrate surface and forms epithelium; Put into clear water more afterwards, remove epithelial surfaces residue, make it afterwards to react with soda soap, generate hard metallic soap layer, increase its lubricity;
4) line is taken out: the dish unit after pickling taken out, put into wire pulling machine and be cold drawn to required screw wire diameter;
5) shaping: by moveable scissor single-way moving, the wire rod be stuck in cut-off-die is cut into required stock, molding is afterwards fixed, one punching is by product head just one-step forming, when product be a word cut ditch time, one punch die is indent, oval groove, when product is cross recess, one punch die is indent four square groove, after one punching, rush tool overall operation, molding dead ahead shifted to by two punch dies, two punch dies run forward simultaneously, by product final molding, by backlash rod, stock is released afterwards, putting into firing equipment afterwards needs shaping heating one end to incandescent state stock, less than 7/8 heats 10-12s, 7/8-1 heats 17-18s, stock after heating is moved to forming machine rapidly, pass through back seat, clamping is fixed, head mould impacts stock, in addition shaping, and utilize extruding by product contracting bar on bundle bar machine,
6) roll over tooth: fixed by one piece of dental lamina, another block movable teeth strip movable property product move, utilize extruding to make product produce plastic deformation, form required screw thread;
7) heat treatment: afterwards shaped screw is quenched being heated to about 850 DEG C in oil, carry out high tempering at about 400-500 DEG C afterwards, cool rapidly after tempering;
8) surface treatment: finally screw submergence temperature is about 550 DEG C dissolve in the coating bath of zinc, make the iron-zinc alloy on screw surface gradually become passivation zinc in product external surfaces, after curing about one day afterwards below 200 DEG C, namely obtain last product.
In a preferred embodiment of the present invention, in described annealing steps, to be warming up to needed for 700 DEG C 5 hours, and when being cooled to 500 DEG C from 700 DEG C required 4 hours.
In a preferred embodiment of the present invention, in described acid pickling step, the content of hydrochloric acid is 26-30%.
Of the present invention is a kind of processing technology of aviation screw, and the screw produced in the present invention is applicable to aviation use, wear-resistant, and intensity is high, good toughness, not fragile, long service life.
Detailed description of the invention
Below preferred embodiment of the present invention is described in detail, can be easier to make advantages and features of the invention be readily appreciated by one skilled in the art, thus more explicit defining is made to protection scope of the present invention.
Of the present invention is a kind of processing technology of aviation screw, comprises the steps:
1) dish unit: go out to buy original disc bar as base material from raw material business;
2) anneal: need hang in stove by product to be processed, and tight lid bell, in-furnace temperature is slowly risen to about 700 DEG C, and keeps 6-7 hour at this temperature, afterwards in-furnace temperature is slowly down to 500 DEG C, then cools to normal temperature with the furnace;
3) pickling: the whole dish unit after annealing is immersed in the hydrochloric acid trough of normal temperature respectively, continue to put into multiple hydrochloric acid trough, until the oxide-film that removing dish unit is surperficial completely, put into clear water afterwards, remove the hcl corrosion product of wire surface, then put into oxalic acid, increase the activity of metal, finally will coil unit to immerse in zinc phosphate solution, substrate surface is contacted with treatment fluid, and base material dissolves generates insoluble Zn
2fe(PO
4)
24H
2o, is attached to substrate surface and forms epithelium; Put into clear water more afterwards, remove epithelial surfaces residue, make it afterwards to react with soda soap, generate hard metallic soap layer, increase its lubricity;
4) line is taken out: the dish unit after pickling taken out, put into wire pulling machine and be cold drawn to required screw wire diameter;
5) shaping: by moveable scissor single-way moving, the wire rod be stuck in cut-off-die is cut into required stock, molding is afterwards fixed, one punching is by product head just one-step forming, when product be a word cut ditch time, one punch die is indent, oval groove, when product is cross recess, one punch die is indent four square groove, after one punching, rush tool overall operation, molding dead ahead shifted to by two punch dies, two punch dies run forward simultaneously, by product final molding, by backlash rod, stock is released afterwards, putting into firing equipment afterwards needs shaping heating one end to incandescent state stock, less than 7/8 heats 10-12s, 7/8-1 heats 17-18s, stock after heating is moved to forming machine rapidly, pass through back seat, clamping is fixed, head mould impacts stock, in addition shaping, and utilize extruding by product contracting bar on bundle bar machine,
6) roll over tooth: fixed by one piece of dental lamina, another block movable teeth strip movable property product move, utilize extruding to make product produce plastic deformation, form required screw thread;
7) heat treatment: afterwards shaped screw is quenched being heated to about 850 DEG C in oil, carry out high tempering at about 400-500 DEG C afterwards, cool rapidly after tempering;
8) surface treatment: finally screw submergence temperature is about 550 DEG C dissolve in the coating bath of zinc, make the iron-zinc alloy on screw surface gradually become passivation zinc in product external surfaces, after curing about one day afterwards below 200 DEG C, namely obtain last product.
5 hours are warming up to needed for 700 DEG C in described annealing steps, and when being cooled to 500 DEG C from 700 DEG C required 4 hours.
In described acid pickling step, the content of hydrochloric acid is 26-30%.
Of the present invention is a kind of processing technology of aviation screw, and the screw produced in the present invention is applicable to aviation use, wear-resistant, and intensity is high, good toughness, not fragile, long service life.
The foregoing is only the specific embodiment of the present invention; but protection scope of the present invention is not limited thereto; any those of ordinary skill in the art are in the technical scope disclosed by the present invention; the change can expected without creative work or replacement, all should be encompassed within protection scope of the present invention.Therefore, the protection domain that protection scope of the present invention should limit with claims is as the criterion.
Claims (3)
1. a processing technology for aviation screw, is characterized in that: comprise the steps:
1) dish unit: go out to buy original disc bar as base material from raw material business;
2) anneal: need hang in stove by product to be processed, and tight lid bell, in-furnace temperature is slowly risen to about 700 DEG C, and keeps 6-7 hour at this temperature, afterwards in-furnace temperature is slowly down to 500 DEG C, then cools to normal temperature with the furnace;
3) pickling: the whole dish unit after annealing is immersed in the hydrochloric acid trough of normal temperature respectively, continue to put into multiple hydrochloric acid trough, until the oxide-film that removing dish unit is surperficial completely, put into clear water afterwards, remove the hcl corrosion product of wire surface, then put into oxalic acid, increase the activity of metal, finally will coil unit to immerse in zinc phosphate solution, substrate surface is contacted with treatment fluid, and base material dissolves generates insoluble Zn
2fe(PO
4)
24H
2o, is attached to substrate surface and forms epithelium; Put into clear water more afterwards, remove epithelial surfaces residue, make it afterwards to react with soda soap, generate hard metallic soap layer, increase its lubricity;
4) line is taken out: the dish unit after pickling taken out, put into wire pulling machine and be cold drawn to required screw wire diameter;
5) shaping: by moveable scissor single-way moving, the wire rod be stuck in cut-off-die is cut into required stock, molding is afterwards fixed, one punching is by product head just one-step forming, when product be a word cut ditch time, one punch die is indent, oval groove, when product is cross recess, one punch die is indent four square groove, after one punching, rush tool overall operation, molding dead ahead shifted to by two punch dies, two punch dies run forward simultaneously, by product final molding, by backlash rod, stock is released afterwards, putting into firing equipment afterwards needs shaping heating one end to incandescent state stock, less than 7/8 heats 10-12s, 7/8-1 heats 17-18s, stock after heating is moved to forming machine rapidly, pass through back seat, clamping is fixed, head mould impacts stock, in addition shaping, and utilize extruding by product contracting bar on bundle bar machine,
6) roll over tooth: fixed by one piece of dental lamina, another block movable teeth strip movable property product move, utilize extruding to make product produce plastic deformation, form required screw thread;
7) heat treatment: afterwards shaped screw is quenched being heated to about 850 DEG C in oil, carry out high tempering at about 400-500 DEG C afterwards, cool rapidly after tempering;
8) surface treatment: finally screw submergence temperature is about 550 DEG C dissolve in the coating bath of zinc, make the iron-zinc alloy on screw surface gradually become passivation zinc in product external surfaces, after curing about one day afterwards below 200 DEG C, namely obtain last product.
2. the processing technology of aviation screw according to claim 1, is characterized in that: to be warming up to needed for 700 DEG C 5 hours in described annealing steps, and when being cooled to 500 DEG C from 700 DEG C required 4 hours.
3. the processing technology of aviation screw according to claim 1, is characterized in that: in described acid pickling step, the content of hydrochloric acid is 26-30%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410778783.6A CN104439984A (en) | 2014-12-17 | 2014-12-17 | Machining process of aviation screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410778783.6A CN104439984A (en) | 2014-12-17 | 2014-12-17 | Machining process of aviation screw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104439984A true CN104439984A (en) | 2015-03-25 |
Family
ID=52887150
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410778783.6A Pending CN104439984A (en) | 2014-12-17 | 2014-12-17 | Machining process of aviation screw |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104439984A (en) |
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105666063A (en) * | 2016-03-28 | 2016-06-15 | 海盐光大标准件有限公司 | Processing process for fastening bolt of highway guardrail |
| CN106676393A (en) * | 2017-02-17 | 2017-05-17 | 江苏佳杰特种螺钉有限公司 | Technology for producing fastener for aerospace |
| CN106862864A (en) * | 2017-02-17 | 2017-06-20 | 江苏佳杰特种螺钉有限公司 | A kind of technique for producing ocean engineering fastener |
| CN106903483A (en) * | 2017-02-17 | 2017-06-30 | 江苏佳杰特种螺钉有限公司 | A kind of technique for producing nuclear power fastener |
| CN107058705A (en) * | 2017-02-17 | 2017-08-18 | 江苏佳杰特种螺钉有限公司 | A kind of production technology for the fastener applied in high ferro |
| CN107058669A (en) * | 2017-02-17 | 2017-08-18 | 江苏佳杰特种螺钉有限公司 | A kind of production technology for the fastener applied on automobile |
| CN107695631A (en) * | 2017-10-25 | 2018-02-16 | 苏州华丰不锈钢紧固件有限公司 | A kind of processing and forming technology of screw |
| CN108544186A (en) * | 2018-03-28 | 2018-09-18 | 徐州东鑫铸造有限公司 | A kind of screw production technology |
| CN109483156A (en) * | 2017-09-13 | 2019-03-19 | 南京美克斯精密机械有限公司 | A kind of bolt processing method |
| CN109623269A (en) * | 2018-12-05 | 2019-04-16 | 中山市固耐特金属制品有限公司 | A kind of quick-fried head of anti-CARBURIZING FURNACE FOR STAINLESS FASTENER promotes the processing technology of product precision |
| CN109821922A (en) * | 2019-02-19 | 2019-05-31 | 海盐孙氏建新标准件制造有限公司 | A kind of manufacturing process of screw wire rod |
| CN110468369A (en) * | 2018-05-09 | 2019-11-19 | 国联螺丝工业股份有限公司 | 300 series stainless steel screw fasteners nitridation heat treatment processing procedure |
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| CN111590272A (en) * | 2020-05-15 | 2020-08-28 | 江苏永昊高强度螺栓有限公司 | Bolt machining method |
| CN111644807A (en) * | 2020-04-25 | 2020-09-11 | 上海宏挺紧固件制造有限公司 | Processing technology of inner hexagonal screw |
| CN111872142A (en) * | 2020-07-24 | 2020-11-03 | 上海宏挺紧固件制造有限公司 | Hexagonal screw production process |
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| US6053653A (en) * | 1997-05-09 | 2000-04-25 | Sannohashi Corporation | Fastening method, fastening system and bolt used therefor |
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Cited By (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105666063A (en) * | 2016-03-28 | 2016-06-15 | 海盐光大标准件有限公司 | Processing process for fastening bolt of highway guardrail |
| CN105666063B (en) * | 2016-03-28 | 2018-07-10 | 海盐光大标准件有限公司 | A kind of processing technology of freeway guardrail fastening bolt |
| CN106676393A (en) * | 2017-02-17 | 2017-05-17 | 江苏佳杰特种螺钉有限公司 | Technology for producing fastener for aerospace |
| CN106862864A (en) * | 2017-02-17 | 2017-06-20 | 江苏佳杰特种螺钉有限公司 | A kind of technique for producing ocean engineering fastener |
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| CN109483156A (en) * | 2017-09-13 | 2019-03-19 | 南京美克斯精密机械有限公司 | A kind of bolt processing method |
| CN107695631A (en) * | 2017-10-25 | 2018-02-16 | 苏州华丰不锈钢紧固件有限公司 | A kind of processing and forming technology of screw |
| CN108544186A (en) * | 2018-03-28 | 2018-09-18 | 徐州东鑫铸造有限公司 | A kind of screw production technology |
| CN110468369A (en) * | 2018-05-09 | 2019-11-19 | 国联螺丝工业股份有限公司 | 300 series stainless steel screw fasteners nitridation heat treatment processing procedure |
| CN109623269A (en) * | 2018-12-05 | 2019-04-16 | 中山市固耐特金属制品有限公司 | A kind of quick-fried head of anti-CARBURIZING FURNACE FOR STAINLESS FASTENER promotes the processing technology of product precision |
| CN109821922A (en) * | 2019-02-19 | 2019-05-31 | 海盐孙氏建新标准件制造有限公司 | A kind of manufacturing process of screw wire rod |
| CN111203695A (en) * | 2020-03-23 | 2020-05-29 | 鹏驰五金制品（昆山）有限公司 | Cup head screw production process method |
| CN111644807B (en) * | 2020-04-25 | 2021-10-08 | 上海宏挺紧固件制造有限公司 | Processing technology of inner hexagonal screw |
| CN111644807A (en) * | 2020-04-25 | 2020-09-11 | 上海宏挺紧固件制造有限公司 | Processing technology of inner hexagonal screw |
| CN111590272A (en) * | 2020-05-15 | 2020-08-28 | 江苏永昊高强度螺栓有限公司 | Bolt machining method |
| CN111872142A (en) * | 2020-07-24 | 2020-11-03 | 上海宏挺紧固件制造有限公司 | Hexagonal screw production process |
| CN111872142B (en) * | 2020-07-24 | 2022-07-15 | 上海宏挺紧固件制造有限公司 | Hexagonal screw production process |
| CN112276569A (en) * | 2020-10-20 | 2021-01-29 | 苏州市正如懿电子科技有限公司 | Anti-drop screw machining process |
| CN112276569B (en) * | 2020-10-20 | 2022-06-21 | 苏州市正如懿电子科技有限公司 | Anti-drop screw machining process |
| CN112719203A (en) * | 2020-12-28 | 2021-04-30 | 丽水瑞标汽摩配有限公司 | Processing technology of high-strength bolt for automobile engine |
| CN114227179A (en) * | 2022-01-28 | 2022-03-25 | 苏州德朋精密五金有限公司 | Screw production process |
| CN115405604A (en) * | 2022-08-16 | 2022-11-29 | 惠州市益珉金属科技有限公司 | Novel bolt and processing method thereof |
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Application publication date: 20150325 |