CN104466605B - New-energy automobile electric-control system terminals manufacturing process - Google Patents
New-energy automobile electric-control system terminals manufacturing process Download PDFInfo
- Publication number
- CN104466605B CN104466605B CN201410728889.5A CN201410728889A CN104466605B CN 104466605 B CN104466605 B CN 104466605B CN 201410728889 A CN201410728889 A CN 201410728889A CN 104466605 B CN104466605 B CN 104466605B
- Authority
- CN
- China
- Prior art keywords
- cylindrical section
- blank
- electrosilvering
- control system
- energy automobile
- 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.)
- Active
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
- H01R43/16—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for manufacturing contact members, e.g. by punching and by bending
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Forging (AREA)
Abstract
The invention discloses a kind of new-energy automobile electric-control system terminals manufacturing process, comprise the following steps: blanking, annealing, peeling, surface oxidation, surface lubrication process, just squeeze, anti-squeeze, machining, electrosilvering, passivation.After the terminals steady quality of this technique production, molding, error is little.Yield rate is high, production efficiency improves, the production cycle is shorter, and after instead of forge hot, a large amount of processing methods using machine tooling, decrease the workload of machine tooling, saved substantial amounts of copper resource, can meet required precision, reduce again manufacturing cost and cycle.
Description
Technical field
The invention belongs to metalwork forging forming technical field, particularly relate to a kind of new-energy automobile electric-control system terminals manufacturing process.
Background technology
New-energy automobile electric-control system terminals are parts important in new-energy automobile electric-control system, mainly play the effect of wiring, by terminals wiring, and line sequence neat easily debugging attractive in appearance.The manufacture of terminals is at present frequently with direct Vehicle Processing bar, and then boring, Milling Process inner chamber and end face, this kind of method efficiency is low, and waste of raw materials is serious, and production cost is high, especially because raw material metal streamline is cut off and makes comprehensive mechanical performance reduce.
The present invention is directed to the drawback of existing machining new-energy automobile electric-control system terminals, mainly solve existing conventional machining process, the shortcoming that machine tool input is more, production efficiency is low, manufacturing cost is high, be difficult to formation batch production, a kind of new-energy automobile electric-control system terminals manufacturing process is provided, and the effect that interiors of products tissue density is high, conducts electricity very well, economize in raw materials can be reached.
Summary of the invention
The present invention is achieved by the following technical solution:
A kind of new-energy automobile electric-control system terminals manufacturing process, comprises the following steps:
1. blanking: intercept copper bar material；
2. annealing: being heated to 680～720 DEG C, be incubated 2 hours, stove is as cold as 350 DEG C, blow-on door, continues to be as cold as 120 DEG C, hangs out charging basket air cooling to room temperature；
3. base: by instrument lathe turning, end face, chamfering；
4. surface oxidation: persulfate soaks oxidation processes, and persulfate solution formula is: sodium hydroxide (NaOH) 45～55 g/L, potassium peroxydisulfate (K2S2O8) 5～15 g/L；Solution temperature controls at 60～65 DEG C, soak time 10～15 minutes；
5. surface lubrication processes: the blank after oxidation, after drying or drying, carries out grease lubrication process；
The most crowded: blank is put into die, the big cylindrical section of cold forging forward extrusion molding and roundlet shell of column under normal temperature condition；
The most counter squeeze: blank is put into die, cold forging anti-extrusion big cylindrical section inner chamber Large central aperture and the connecting hole that is attached thereto under normal temperature condition；
8. machining: the thin mouth end of Vehicle Processing big cylindrical section outer wall, groove and the little centre bore of roundlet shell of column inner chamber；
9. electrosilvering: being processed by the workpiece electrosilvering after machining, silver plating thicknesses is 6～7 m；
10. passivation: electrosilvering part is immersed in chromatedsolution passivation, and chromatedsolution formula is: potassium dichromate (K2Cr2O7) 10～15 g/L, nitric acid HNO3(d=1.42g/cm3) 10～15 g/L；Solution temperature is 10～30 DEG C, soak time 10～30 seconds.Passivation purpose is to improve the resistance to corrosion of silver layer, and makes Deposit appearance and the performance such as conduction, welding unaffected.
A kind of new-energy automobile electric-control system terminals manufacturing process, comprises the following steps:
1. blanking: intercept copper bar material；
2. annealing: being heated to 680～720 DEG C, be incubated 2 hours, stove is as cold as 350 DEG C, blow-on door, continues to be as cold as 120 DEG C, hangs out charging basket air cooling to room temperature；
3. base: by instrument lathe turning, end face, chamfering；
4. surface oxidation: persulfate soaks oxidation processes, and persulfate solution formula is: sodium hydroxide (NaOH) 45～55 g/L, potassium peroxydisulfate (K2S2O8) 5～15 g/L；Solution temperature controls at 60～65 DEG C, soak time 10～15 minutes；
5. surface lubrication processes: the blank after oxidation, after drying or drying, carries out grease lubrication process；
The most crowded: blank is put into die, the big cylindrical section of cold forging forward extrusion molding and roundlet shell of column under normal temperature condition；
7. Bidirectional-squeezing: cold forging bidirectional extrusion forming big cylindrical section inner chamber Large central aperture and the little centre bore of roundlet shell of column inner chamber under normal temperature condition；
8. machining: the thin mouth end of Vehicle Processing big cylindrical section outer wall, groove and big connecting hole between cylindrical section and roundlet shell of column；
9. electrosilvering: being processed by the workpiece electrosilvering after machining, silver plating thicknesses is 6～7 m；
10. passivation: electrosilvering part is immersed in chromatedsolution passivation, and chromatedsolution formula is: potassium dichromate (K2Cr2O7) 10～15 g/L, nitric acid HNO3(d=1.42g/cm3) 10～15 g/L；Solution temperature is 10～30 DEG C, soak time 10～30 seconds.
After described machining steps completes, little centre bore is communicated by connecting hole with Large central aperture.
Beneficial effects of the present invention:
Finish forge cold-finishing forming technique is applied to new-energy automobile electric-control system terminals manufacture by the present invention, reduce follow-up machining, save substantial amounts of copper resource and processing technique is simple, the metal streamline of material is complete, constant product quality, interior tissue density are high, comprehensive mechanical performance is good, conduct electricity very well, production efficiency is high, can meet required precision, reduce again manufacturing cost.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention；
Fig. 2 is the profile of Fig. 1；
Fig. 3 is the process chart of the embodiment of the present invention
Fig. 4 is that the present invention implements blank deformation flow chart in new-energy automobile electric-control system terminals manufacturing process.
Sequence number in figure: 1, Large central aperture, 2, thin mouth end, 3, groove, 4, big cylindrical section, 5, connecting hole, 6, roundlet shell of column, 7, little centre bore.
Detailed description of the invention
Below by embodiment, and combine Fig. 1, Fig. 2, Fig. 3 and Fig. 4 technical scheme is described in further detail.
See shown in Fig. 1 and Fig. 2, a kind of new-energy automobile electric-control system terminals, the two section hollow circuit cylinder the biggest cylindrical sections 4 not of uniform size including external diameter and roundlet shell of column 6, big cylindrical section 4 inner chamber is provided with Large central aperture 1, roundlet shell of column 6 inner chamber is provided with little centre bore 7, the external diameter of big cylindrical section 4 is 19.9mm, internal diameter is 12mm, and the external diameter of roundlet shell of column 6 is 13.7mm, internal diameter is 10.5mm, and Large central aperture 1 is communicated by connecting hole 5 with little centre bore 7；The port of big cylindrical section 4 is thin mouth end 2, and the outer wall of big cylindrical section 4 is additionally provided with groove 3, and groove 3 is arranged on below thin mouth end 2, and the surfaces externally and internally of described terminals is provided with silver coating, and silver coating thickness is 6～7 m.
Embodiment one: see shown in Fig. 3 and Fig. 4, a kind of new-energy automobile electric-control system terminals manufacturing process, comprise the steps: 1. blanking: intercept metallic copper bar；2. annealing: being heated to 700 ± 5 DEG C, be incubated 2 hours, stove is as cold as 350 DEG C, blow-on door, continues to be as cold as 120 DEG C, hangs out charging basket air cooling to room temperature；3. base: by instrument lathe turning, end face, chamfering；4. surface oxidation: persulfate soaks oxidation processes, and persulfate solution formula is: sodium hydroxide (NaOH) 45～55 g/L, potassium peroxydisulfate (K2S2O8) 5～15 g/L；Solution temperature controls at 60～65 DEG C, soak time 10～15 minutes；5. surface lubrication processes: the blank after oxidation, after drying or drying, puts into cylinder, adds zinc stearate powder and oils and fats, roller coating 20 minutes；The weight ratio that volume ratio is 10:3, zinc stearate powder and oils and fats of described zinc stearate powder and extruded copper blank is 200:3 200:5；The most crowded: blank is put into die, the big cylindrical section of cold forging forward extrusion molding 4 and roundlet shell of column 6 under normal temperature condition；The most counter squeeze: blank is put into die, cold forging anti-extrusion big cylindrical section 4 inner chamber Large central aperture 1 and the connecting hole 5 that is attached thereto under normal temperature condition；8. machining: the thin mouth end 2 of Vehicle Processing big cylindrical section 4 outer wall, groove 3 and the little centre bore of roundlet shell of column 6 inner chamber 7, little centre bore 7 is communicated by connecting hole 5 with Large central aperture 1；9. electrosilvering: being processed by the workpiece electrosilvering after machining, silver plating thicknesses is 6～7 m；10. passivation: electrosilvering part is immersed in chromatedsolution passivation, and chromatedsolution formula is: potassium dichromate (K2Cr2O7) 10～15 g/L, nitric acid HNO3(d=1.42g/cm3) 10～15 g/L；Solution temperature is 10～30 DEG C, soak time 10～20 seconds, and passivation purpose is to improve the resistance to corrosion of silver layer, and makes Deposit appearance and the performance such as conduction, welding unaffected.
Shown in embodiment two: Fig. 4, a kind of new-energy automobile electric-control system terminals manufacturing process, comprise the following steps: 1. blanking: intercept copper bar material；2. annealing: being heated to 685 ± 5 DEG C, be incubated 2 hours, stove is as cold as 350 DEG C, blow-on door, continues to be as cold as 120 DEG C, hangs out charging basket air cooling to room temperature；3. base: by instrument lathe turning, end face, chamfering；4. surface oxidation: persulfate soaks oxidation processes, and persulfate solution formula is: sodium hydroxide (NaOH) 45～55 g/L, potassium peroxydisulfate (K2S2O8) 5～15 g/L；Solution temperature controls at 60～65 DEG C, soak time 10～15 minutes；5. surface lubrication processes: the blank after oxidation, after drying or drying, puts into cylinder, add lubricant grease, roller coating 20 minutes, lubricant grease formula is: Adeps Sus domestica is heated to 200 DEG C, adds pure machine oil after 2～10 minutes, both stirrings 2～5 minutes, until uniformly, being eventually adding tetradecyl alchohol, wherein proportions is Adeps Sus domestica 13%, tetradecyl alchohol 3%, pure machine oil 84%.The most crowded: blank is put into die, the big cylindrical section of cold forging forward extrusion molding 4 and roundlet shell of column 6 under normal temperature condition；7. Bidirectional-squeezing: cold forging bidirectional extrusion forming big cylindrical section 4 inner chamber Large central aperture 1 and the little centre bore of roundlet shell of column 6 inner chamber 7 under normal temperature condition；8. machining: the thin mouth end 2 of Vehicle Processing big cylindrical section 4 outer wall, groove 3 and big connecting hole 5 between cylindrical section 4 and roundlet shell of column 6；9. electrosilvering: being processed by the workpiece electrosilvering after machining, silver plating thicknesses is 6～7 m；10. passivation: electrosilvering part is immersed in chromatedsolution passivation, and chromatedsolution formula is: potassium dichromate (K2Cr2O7) 10～15 g/L, nitric acid HNO3(d=1.42g/cm3) 10～15 g/L；Solution temperature is 10～30 DEG C, soak time 10～30 seconds.
The present invention is by carrying out cold-extruded precision forging to raw bar material, first make the general blank of terminals, it is finished product new-energy automobile electric-control system terminals by machine tooling again, processing method is simple, both meet new-energy automobile electric-control system terminals required precision, reduce again manufacturing cost and production cycle.
Embodiment is only to facilitate understand technical scheme; it is not intended that limiting the scope of the invention; every without departing from any simple modification, equivalent variations and the modification perhaps according to the technical spirit of the present invention, above scheme made in technical solution of the present invention, within all still falling within scope.
Claims (4)
1. new-energy automobile electric-control system terminals manufacturing process, comprises the following steps:
1. blanking: intercept copper bar material；
2. annealing: being heated to 680～720 DEG C, be incubated 2 hours, stove is as cold as 350 DEG C, blow-on door, continues to be as cold as 120 DEG C, hangs out charging basket air cooling to room temperature；
3. base: by instrument lathe turning, end face, chamfering；
4. surface oxidation: persulfate soaks oxidation processes, and persulfate solution formula is: sodium hydroxide (NaOH) 45～55 g/L, potassium peroxydisulfate (K2S2O8) 5～15 g/L；Solution temperature controls at 60～65 DEG C, soak time 10～15 minutes；
5. surface lubrication processes: the blank after oxidation, after drying or drying, carries out grease lubrication process；
The most crowded: blank is put into die, under normal temperature condition, the big cylindrical section of cold forging forward extrusion molding is (4) with roundlet shell of column (6)；
The most counter squeeze: blank is put into die, under normal temperature condition the big cylindrical section of cold forging anti-extrusion (4) inner chamber Large central aperture (1) and the connecting hole that is attached thereto (5)；
8. machining: the thin mouth end of Vehicle Processing big cylindrical section (4) outer wall (2), groove (3) with the roundlet shell of column little centre bore of (6) inner chamber (7)；
9. electrosilvering: being processed by the workpiece electrosilvering after machining, silver plating thicknesses is 6～7 m；
10. passivation: electrosilvering part is immersed in chromatedsolution passivation, and chromatedsolution formula is: potassium dichromate (K2Cr2O7) 10～15 g/L, nitric acid HNO310～15 g/L；Solution temperature is 10～30 DEG C, soak time 10～30 seconds.
2. new-energy automobile electric-control system terminals manufacturing process, comprises the following steps:
1. blanking: intercept copper bar material；
2. annealing: being heated to 680～720 DEG C, be incubated 2 hours, stove is as cold as 350 DEG C, blow-on door, continues to be as cold as 120 DEG C, hangs out charging basket air cooling to room temperature；
3. base: by instrument lathe turning, end face, chamfering；
4. surface oxidation: persulfate soaks oxidation processes, and persulfate solution formula is: sodium hydroxide (NaOH) 45～55 g/L, potassium peroxydisulfate (K2S2O8) 5～15 g/L；Solution temperature controls at 60～65 DEG C, soak time 10～15 minutes；
5. surface lubrication processes: the blank after oxidation, after drying or drying, carries out grease lubrication process；
The most crowded: blank is put into die, under normal temperature condition, the big cylindrical section of cold forging forward extrusion molding is (4) with roundlet shell of column (6)；
7. Bidirectional-squeezing: under normal temperature condition, the big cylindrical section of cold forging bidirectional extrusion forming (4) inner chamber Large central aperture is (1) with the roundlet shell of column little centre bore of (6) inner chamber (7)；
8. machining: the thin mouth end of Vehicle Processing big cylindrical section (4) outer wall (2), groove (3) and big cylindrical section (4) and roundlet shell of column (6) between connecting hole (5)；
9. electrosilvering: being processed by the workpiece electrosilvering after machining, silver plating thicknesses is 6～7 m；
10. passivation: electrosilvering part is immersed in chromatedsolution passivation, and chromatedsolution formula is: potassium dichromate (K2Cr2O7) 10～15 g/L, nitric acid HNO310～15 g/L；Solution temperature is 10～30 DEG C, soak time 10～30 seconds.
New-energy automobile electric-control system terminals manufacturing process the most according to claim 1 and 2, it is characterised in that: after described machining steps completes, (5) (1) (7) little centre bore communicated by connecting hole with Large central aperture.
New-energy automobile electric-control system terminals manufacturing process the most according to claim 1 and 2, it is characterized in that: described surface lubrication process step: the blank after oxidation, after drying or drying, put into cylinder, add zinc stearate powder and oils and fats, roller coating 20 minutes；The weight ratio that volume ratio is 10:3, zinc stearate powder and oils and fats of described zinc stearate powder and extruded copper blank is 200:3 200:5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410728889.5A CN104466605B (en) | 2014-12-05 | 2014-12-05 | New-energy automobile electric-control system terminals manufacturing process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410728889.5A CN104466605B (en) | 2014-12-05 | 2014-12-05 | New-energy automobile electric-control system terminals manufacturing process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104466605A CN104466605A (en) | 2015-03-25 |
| CN104466605B true CN104466605B (en) | 2016-08-24 |
Family
ID=52912218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410728889.5A Active CN104466605B (en) | 2014-12-05 | 2014-12-05 | New-energy automobile electric-control system terminals manufacturing process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104466605B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105048245B (en) * | 2015-05-30 | 2018-02-23 | 苏州云龙精密成形有限公司 | A kind of processing technology of high ferro electrical cnnector |
| CN104882767B (en) * | 2015-05-30 | 2017-04-12 | 苏州云龙精密成形有限公司 | Cold extruding process of high-speed rail electrical connector pin |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5248090A (en) * | 1975-10-14 | 1977-04-16 | Furukawa Electric Co Ltd:The | Method of manufacturing a connector |
| CN101020200A (en) * | 2006-02-14 | 2007-08-22 | 江苏森威集团有限责任公司 | Precision forging process for radial and reverse combined extrusion |
| CN101422861A (en) * | 2008-11-27 | 2009-05-06 | 江苏森威精锻有限公司 | Precision forming method for special-shaped deep hole parts |
| CN201584515U (en) * | 2009-12-08 | 2010-09-15 | 上海金亭汽车线束有限公司 | Connecting terminal applicable to connection of auto cables with different diameters |
| CN102019335A (en) * | 2010-11-04 | 2011-04-20 | 上海交通大学 | Cold forging processing method of hardened and tempered structural steel |
| CN102350615A (en) * | 2011-08-19 | 2012-02-15 | 江苏森威精锻有限公司 | Shunt blocking forming method for star-shaped sleeve |
| CN102689132A (en) * | 2012-06-11 | 2012-09-26 | 江苏森威精锻有限公司 | Method for improving jumping of rod part of inner spline shaft type forged piece |
| CN103381467A (en) * | 2013-07-11 | 2013-11-06 | 江苏森威精锻有限公司 | Opening and closing mold forming method for step type forge pieces |
| CN103624205A (en) * | 2013-12-04 | 2014-03-12 | 江苏威鹰机械有限公司 | Cold-forging plastic molding technology of precisely-forged brake threaded pipe component |
| CN103858279A (en) * | 2011-10-12 | 2014-06-11 | 菲尼克斯电气公司 | Method for producing a screw connection terminal |
-
2014
- 2014-12-05 CN CN201410728889.5A patent/CN104466605B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5248090A (en) * | 1975-10-14 | 1977-04-16 | Furukawa Electric Co Ltd:The | Method of manufacturing a connector |
| CN101020200A (en) * | 2006-02-14 | 2007-08-22 | 江苏森威集团有限责任公司 | Precision forging process for radial and reverse combined extrusion |
| CN101422861A (en) * | 2008-11-27 | 2009-05-06 | 江苏森威精锻有限公司 | Precision forming method for special-shaped deep hole parts |
| CN201584515U (en) * | 2009-12-08 | 2010-09-15 | 上海金亭汽车线束有限公司 | Connecting terminal applicable to connection of auto cables with different diameters |
| CN102019335A (en) * | 2010-11-04 | 2011-04-20 | 上海交通大学 | Cold forging processing method of hardened and tempered structural steel |
| CN102350615A (en) * | 2011-08-19 | 2012-02-15 | 江苏森威精锻有限公司 | Shunt blocking forming method for star-shaped sleeve |
| CN103858279A (en) * | 2011-10-12 | 2014-06-11 | 菲尼克斯电气公司 | Method for producing a screw connection terminal |
| CN102689132A (en) * | 2012-06-11 | 2012-09-26 | 江苏森威精锻有限公司 | Method for improving jumping of rod part of inner spline shaft type forged piece |
| CN103381467A (en) * | 2013-07-11 | 2013-11-06 | 江苏森威精锻有限公司 | Opening and closing mold forming method for step type forge pieces |
| CN103624205A (en) * | 2013-12-04 | 2014-03-12 | 江苏威鹰机械有限公司 | Cold-forging plastic molding technology of precisely-forged brake threaded pipe component |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104466605A (en) | 2015-03-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103170798B (en) | A kind of processing method of high-quality large-diameter thin-wall metal cylinder | |
| CN102463272A (en) | Short-process preparation method of small-caliber nickel-based alloy thin-wall pipe | |
| CN102909237B (en) | A kind of preparation method of TA18 thick-wall tube | |
| CN104589002A (en) | Manufacturing technology of hollow outer gear of electric forklift driving flange | |
| CN103157759A (en) | Cylindrical gear warm-cold combined precision forging plastic molding process | |
| CN109366109A (en) | Front of the car connecting bushing processing technology | |
| CN101396697B (en) | High strength aluminum alloy quincunx deep blind hole piece extrusion molding technique | |
| CN105108456A (en) | Manufacturing method of new-energy automobile drive motor shaft | |
| CN101769280A (en) | Cold extruding processing method of spline housing and spline housing produced by same | |
| CN102125943A (en) | Manufacturing process of hose coupling | |
| CN101428302B (en) | Aldural conical thin-wall member workblank extrusion forming process | |
| CN103157758A (en) | Precision forging plastic forming process for inner gear ring in planetary reducer | |
| CN103624506A (en) | Precision forging and plastic molding process for inner toothed ring of winch | |
| CN101934341A (en) | Forging technology of TC4 titanium alloy cylindrical part | |
| CN103567247A (en) | Novel warm extrusion method for efficiently processing internal-tooth cylindrical gears | |
| CN104466605B (en) | New-energy automobile electric-control system terminals manufacturing process | |
| CN103706754A (en) | Precision forging plastic molding process for internal toothed rings of planetary speed reducers | |
| CN104439995A (en) | Making technology for transmission double-end internal-teeth ring of electric forklift | |
| CN109274231B (en) | Machining process for producing motor shell by using titanium metal | |
| CN110434187B (en) | Extrusion method of high-brittleness aluminum alloy and high-brittleness aluminum alloy extrusion piece | |
| CN105904163A (en) | Cold forging forming technology of input bracket claw piece | |
| CN103624205A (en) | Cold-forging plastic molding technology of precisely-forged brake threaded pipe component | |
| CN103769825A (en) | Planet carrier for automobile and cold-forging forming process thereof | |
| CN104338781A (en) | Method for manufacturing high-hardness cold-drawn steel tube | |
| CN105537304A (en) | Cold extruded plunger processing method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |