CN106623488B - A kind of processing method of rectangle diplopore silver-bearing copper pipe - Google Patents
A kind of processing method of rectangle diplopore silver-bearing copper pipe Download PDFInfo
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- CN106623488B CN106623488B CN201610658979.0A CN201610658979A CN106623488B CN 106623488 B CN106623488 B CN 106623488B CN 201610658979 A CN201610658979 A CN 201610658979A CN 106623488 B CN106623488 B CN 106623488B
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- double
- diplopore
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 21
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical group [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 21
- 239000010949 copper Substances 0.000 title claims abstract description 21
- 229910052709 silver Inorganic materials 0.000 title claims abstract description 21
- 239000004332 silver Substances 0.000 title claims abstract description 21
- 238000003672 processing method Methods 0.000 title claims abstract description 16
- 238000005266 casting Methods 0.000 claims abstract description 13
- 238000004140 cleaning Methods 0.000 claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000012856 packing Methods 0.000 claims abstract description 7
- 238000003860 storage Methods 0.000 claims abstract description 5
- 239000012459 cleaning agent Substances 0.000 claims abstract description 4
- 238000005520 cutting process Methods 0.000 claims abstract description 4
- 238000002844 melting Methods 0.000 claims abstract description 4
- 230000008018 melting Effects 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 15
- 229910052751 metal Inorganic materials 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 12
- 230000007704 transition Effects 0.000 claims description 12
- YCKOAAUKSGOOJH-UHFFFAOYSA-N copper silver Chemical compound [Cu].[Ag].[Ag] YCKOAAUKSGOOJH-UHFFFAOYSA-N 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- 238000012545 processing Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 6
- 238000004080 punching Methods 0.000 claims description 4
- 238000012797 qualification Methods 0.000 claims description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 238000000137 annealing Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000007547 defect Effects 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 150000002739 metals Chemical class 0.000 claims description 3
- 238000007747 plating Methods 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000005482 strain hardening Methods 0.000 claims description 3
- 238000003723 Smelting Methods 0.000 claims 2
- 238000001953 recrystallisation Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000005611 electricity Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000004540 process dynamic Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/15—Making tubes of special shape; Making tube fittings
- B21C37/151—Making tubes with multiple passages
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Extraction Processes (AREA)
Abstract
The present invention provides a kind of processing method of rectangle diplopore silver-bearing copper pipe, includes the following steps：Step S1, melting, step S2, ingot casting, step S3 is squeezed, step S4, preceding drawing, step S5, heat treatment, step S6, rear drawing, step S7, finishing are straightened first in finishing, then it cuts off, 250mm croppings is carried out to the product after alignment using serration sawing machine, carrying out high pressure gas to the product for cutting through head using cleaning equipment sweeps, high pressure water be used in combination that cleaning agent is added to be cleaned, finishing is carried out again to the product after cleaning, finally length as required cuts scale, cleaning surfaces externally and internally；Step S8 is examined, step S9, and finished product packing storage, compared with prior art, the present invention has following advantageous effect：Solve supply requirement of the electricity generation unit manufacturing firm of China to the product, feature is the strict demand of the particularity, dimensional tolerance and properties of product of shape.
Description
Technical field
The present invention is a kind of processing method of rectangle diplopore silver-bearing copper pipe, belongs to technical field of nonferrous metal processing.
Background technology
Rectangle diplopore silver-bearing copper pipe has big, unit interval, perfect heat-dissipating more by cooling medium consumption of conductive section etc.
Feature is the critical material that high-power (600,000 kilowatts or more) thermal power generation unit rotor windings are expected.Using rectangle diplopore
Silver-bearing copper pipe replaces traditional single hole pipe, greatly improves flow velocity and heat dissipation effect of the medium in pipe, on generator,
Special super high power generator amature winding, greatly improves generating capacity, so that general power is can be improved nearly 30%, at present very
Mostly well-known generating equipment producer all is expecting to use this rectangle diplopore silver-bearing copper pipe.Such as：East motor, Shanghai motor, Harbin
The critical material all on being badly in need of this Generator Set such as motor, Shandong motor, north weight Alstom.
Invention content
In view of the deficienciess of the prior art, it is an object of the present invention to provide a kind of processing method of rectangle diplopore silver-bearing copper pipe,
To solve the problems mentioned in the above background technology, the present invention is easy to use, and easy to operation, stability is good, and reliability is high.
To achieve the goals above, the present invention is to realize by the following technical solutions：A kind of rectangle diplopore silver-bearing copper pipe
Processing method, include the following steps：
Step S1, melting make it be melted into copper silver water copper silver raw material metal block by heating；
Step S2, ingot casting are poured into designed mold with the copper silver water of fusing and form product；
Step S3 is also diplopore blank for the extrusion billet that double-hole tube is provided, the pecker used when so squeezing
Must be crosspointer, and it is unusual imbalance that crosspointer, which deviates extruding center position metal flow of left and right in extrusion process,
Under powerful extruding force effect, make crosspointer to Centre position deviation, causes the diplopore pipe wall thickness deviation squeezed out excessive, Bu Nengman
The processing of foot procedure, so the key point of the present invention is that solve problems.Equilibrant force mould is used when squeezing
Hole makes section both sides metal be flowed out from equilibrant force die hole, it is therefore prevented that this part metals flows to big cross section and causes pecker in
The heart deviates, to solve the problems, such as that diplopore pipe wall thickness deviation is serious.In addition, when perforating to prevent from squeezing, pecker is to casting
Ingot off-centring squeezes and ingot casting is carried out punching processing before producing, and aperture size is more than pecker 0.5-1.0mm.
Step S4, preceding drawing will squeeze the gradual transition of double-hole tube blank material and be drawn into double-hole tube；
Step S5, heat treatment will be passed through and are heat-treated three times to eliminate the unevenness that cold working generates in the process after step S4
Even deformation restores plastic deformation, and annealing temperature will be maintained at 520-550 DEG C, keep the temperature 60-80min, fully be softened again with obtaining
Crystalline structure will carry out N to prevent product from aoxidizing2Protection be evacuated to -0.1MPa to furnace chamber, power transmission heating anneal,
Double-hole tube product can come out of the stove at 60 DEG C or less；
Step S6, rear drawing are designed drawing die external mold, internal model, external mold according to the dimensional tolerance required by finished product
Having inlet angle should use 12 ° of angles, entrance R to use R5, and calibrating strap controls within 6mm, to prevent excessive deformation from leading to product table
Planar defect, internal model control the distance between two rectangle internal models simultaneously using double square internal model, and internal model quadrangle R is R0.8, can
So that the reaction force in drawing process is preferably minimized, the rectangular tube surface quality drawn out is made to reach high-precision grade standard；
Step S7, finishing are straightened first in finishing, that is, use special horizontal rectangle straightener to carry out essence to double-hole tube
Thin alignment, ensures straightness≤0.5mm/m, flatness≤1mm/m, then torsion resistance≤1mm/m is cut off, using serration sawing machine
250mm croppings are carried out to the product after alignment, carrying out high pressure gas to the product for cutting through head using cleaning equipment sweeps, and height is used in combination
Pressure water adds cleaning agent to be cleaned, and finishing is carried out again to the product after cleaning, and finally length as required cuts scale, in cleaning
Outer surface；
Step S8 is examined, and is checked the dimensional tolerance as required of the product after finishing and indices；
Step S9, finished product packing storage carry out finished product packing and enter as required to the double-hole tube Jing Guo finished product inspection qualification
Library.
Further, in step s3, when perforating to prevent from squeezing, pecker is to ingot casting off-centring, before squeezing production
Ingot casting is subjected to punching processing, aperture size is more than pecker 0.5-1.0mm.
Further, in step S4 and step S6, by drawing transition deformation, will squeeze double-hole tube blank material endoporus by
Round gradually transition is rectangle, and the working modulus of every time transition deformation is controlled 25% or so, and lengthening coefficient should be controlled in 1.30-
Between 1.35.
Further, in step s 6, drawing external mold material selection carbide alloy YG 8 stretches internal model material selection speciality
Steel T10a, working surface hard chrome plating 0.03-0.05mm, since product is rectangle double-hole tube, so every time is stretched all using double
Internal model and single external mold.
Further, in step s 8, ensure straightness≤0.5mm/m, flatness≤1mm/m, torsion resistance≤1mm/m.
Beneficial effects of the present invention：A kind of processing method of rectangle diplopore silver-bearing copper pipe of the present invention, solves the big work(in China
Rate generating set manufacturing firm is the particularity, dimensional tolerance and product of shape to the supply requirement of the product, feature
The strict demand of energy.
Description of the drawings
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon：
The step of Fig. 1 is the processing method of rectangle diplopore silver-bearing copper pipe in the present invention is schemed；
Fig. 2 is the cast ingot product schematic diagram before the extruding of the processing method of rectangle diplopore silver-bearing copper pipe in the present invention；
Fig. 3 is the product schematic diagram after the preceding drawing of the processing method of rectangle diplopore silver-bearing copper pipe in the present invention；
Fig. 4 is the schematic diagram of the processing mold design of rectangle diplopore silver-bearing copper pipe in the present invention；
Fig. 5 is the final drawing finished product schematic diagram of rectangle diplopore silver-bearing copper pipe in the present invention.
Specific implementation mode
To make the technical means, the creative features, the aims and the efficiencies achieved by the present invention be easy to understand, with reference to
Specific implementation mode, the present invention is further explained.
Referring to Fig. 1, the present invention provides a kind of technical solution：A kind of processing method of rectangle diplopore silver-bearing copper pipe, including with
Lower step：
Step S1, melting make it be melted into copper silver water copper silver raw material metal block by heating.
Step S2, ingot casting are poured into designed mold with the copper silver water of fusing and form product.
The chemical composition of ingot casting such as following table：
| Chemical element | Cu+Ag | Ag | O | Other elements |
| Content | ＞ 99.97% | 0.08-0.12% | ≤ 0.001% | ＜ 0.03% |
Step S3 squeezes, is also diplopore blank for the extrusion billet that double-hole tube is provided, and what is used when so squeezing wears
Hole needle must be crosspointer, and crosspointer deviates extruding center position, that is, ingot casting center, the metal stream of left and right in extrusion process
Dynamic is unusual imbalance, under powerful extruding force effect, makes crosspointer to Centre position deviation, leads to the diplopore pipe squeezed out
Wall thickness deviation is excessive, cannot meet the processing of next procedure, so the key point of the present invention is that solve problems,
Equilibrant force die hole is used when extruding, section both sides metal is made to be flowed out from equilibrant force die hole, it is therefore prevented that this part metals flow direction is big
Section causes pecker to off-centring, to solve the problems, such as that diplopore pipe wall thickness deviation is serious.In addition, to prevent from squeezing
When perforation, pecker squeezes and ingot casting is carried out punching processing before producing, aperture size is more than pecker to ingot casting off-centring
0.5-1.0mm, such as Fig. 2 solve the double-hole tube blank material for squeezing and providing qualification for next procedure by above technological measure
Technical barrier.
Step S4, preceding drawing will squeeze the gradual transition of double-hole tube blank material and be drawn into double-hole tube.
Step S5, heat treatment will be passed through and are heat-treated three times to eliminate the unevenness that cold working generates in the process after step S4
Even deformation restores plastic deformation, and annealing temperature will be maintained at 520-550 DEG C, keep the temperature 60-80min, fully be softened again with obtaining
Crystalline structure will carry out N to prevent product from aoxidizing2Protection be evacuated to -0.1MPa to furnace chamber, power transmission heating anneal,
Double-hole tube product can come out of the stove at 60 DEG C or less.
In step S4 and step S6, by drawing transition deformation, double-hole tube blank material endoporus will be squeezed by round gradual
Transition is rectangle, the working modulus control of every time transition deformation 25% or so, lengthening coefficient should control 1.30-1.35 it
Between.
Product such as Fig. 3 after preceding drawing and heat treatment.
Step S6, rear drawing are designed drawing die external mold, internal model, external mold according to the dimensional tolerance required by finished product
Having inlet angle should use 12 ° of angles, entrance R to use R5, and calibrating strap controls within 6mm, to prevent excessive deformation from leading to product table
Planar defect, internal model control the distance between two rectangle internal models simultaneously using double square internal model, and internal model quadrangle R is R0.8, can
So that the reaction force in drawing process is preferably minimized, the rectangular tube surface quality drawn out is made to reach high-precision grade standard.
In step s 6, drawing external mold material selection carbide alloy YG 8 stretches internal model material selection speciality steel T10a, work
Make plating hard chromium on surface 0.03-0.05mm, since product is rectangle double-hole tube, all uses double internal models and list outer so every time is stretched
Mould.
Drawing China and foreign countries mould, internal model such as Fig. 4 afterwards.
Step S7, finishing are straightened first in finishing, that is, use special horizontal rectangle straightener to carry out essence to double-hole tube
Thin alignment, ensures straightness≤0.5mm/m, flatness≤1mm/m, then torsion resistance≤1mm/m is cut off, using serration sawing machine
250mm croppings are carried out to the product after alignment, carrying out high pressure gas to the product for cutting through head using cleaning equipment sweeps, and height is used in combination
Pressure water adds cleaning agent to be cleaned, and finishing is carried out again to the product after cleaning, and finally length as required cuts scale, in cleaning
Outer surface.
Step S8 is examined, and is checked the dimensional tolerance as required of the product after finishing and indices.
In step s 8, ensure straightness≤0.5mm/m, flatness≤1mm/m, torsion resistance≤1mm/m.
Step S9, finished product packing storage carry out finished product packing and enter as required to the double-hole tube Jing Guo finished product inspection qualification
Library.
The present invention solves supply requirement of the electricity generation unit manufacturing firm of China to the product, and feature is shape
The strict demand of the particularity, dimensional tolerance and properties of product of shape.
The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention, for this field skill
For art personnel, it is clear that invention is not limited to the details of the above exemplary embodiments, and without departing substantially from the present invention spirit or
In the case of essential characteristic, the present invention can be realized in other specific forms.Therefore, in all respects, should all incite somebody to action
Embodiment regards exemplary as, and is non-limiting, the scope of the present invention by appended claims rather than on state
Bright restriction, it is intended that including all changes that come within the meaning and range of equivalency of the claims in the present invention
It is interior.Any reference signs in the claims should not be construed as limiting the involved claims.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiment being appreciated that.
Claims (5)
1. a kind of processing method of rectangle diplopore silver-bearing copper pipe, includes the following steps：
Step S1, melting make it be melted into copper silver water copper silver raw material metal block by smelting furnace；
Step S2, ingot casting, smelting furnace make copper silver water be solidified as copper silver ingot by crystallizer；
Step S3 is squeezed, and equilibrant force die hole is used when squeezing, and is added die hole, is made section both sides metal from equilibrant force die hole
Outflow, it is therefore prevented that this part metals flows to big cross section and causes pecker to off-centring；
Step S4, preceding drawing will squeeze the gradual transition of double-hole tube blank material and be drawn into double-hole tube；
Step S5, heat treatment will be passed through and are heat-treated three times to eliminate the uneven change that cold working generates in the process after step S4
Shape restores plastic deformation, and annealing temperature will be maintained at 520-550 DEG C, keep the temperature 60-80min, to obtain the recrystallization fully softened
Tissue, to prevent product from aoxidizing, will carry out N2Protection, carries out furnace chamber to be evacuated to -0.1MPa, power transmission heating anneal, diplopore
Pipe product can come out of the stove at 60 DEG C or less；
Step S6, rear drawing are designed drawing die external mold, internal model, outer mold enters according to the dimensional tolerance required by finished product
Bicker uses 12 ° of angles, entrance R to use R5, and calibrating strap controls within 6mm, to prevent excessive deformation from leading to surface defects of products,
Internal model controls the distance between two rectangle internal models simultaneously using double square internal model, and internal model quadrangle R is R0.8, can make drawing
Reaction force in journey is preferably minimized, and the rectangular tube surface quality drawn out is made to reach high-precision grade standard；
Step S7, finishing are straightened first in finishing, that is, use special horizontal rectangle straightener to carry out fine school to double-hole tube
Directly, ensure straightness≤0.5mm/m, flatness≤1mm/m, then torsion resistance≤1mm/m is cut off, using serration sawing machine to school
Product after straight carries out 250mm croppings, and carrying out high pressure gas to the product for cutting through head using cleaning equipment sweeps, and high pressure water is used in combination
Add cleaning agent to be cleaned, finishing carried out again to the product after cleaning, finally length as required cut scale, appearance in cleaning
Face；
Step S8 is examined, and is checked the dimensional tolerance as required of the product after finishing and indices；
Step S9, finished product packing storage carry out finished product packing and storage as required to the double-hole tube Jing Guo finished product inspection qualification.
2. a kind of processing method of rectangle diplopore silver-bearing copper pipe according to claim 1, it is characterised in that：In step s3,
When perforating to prevent from squeezing, pecker squeezes and ingot casting is carried out punching processing before producing, aperture size is big to ingot casting off-centring
In pecker 0.5-1.0mm.
3. a kind of processing method of rectangle diplopore silver-bearing copper pipe according to claim 1, it is characterised in that：In step S4 and step
In rapid S6, by drawing transition deformation, will squeeze double-hole tube blank material endoporus by round gradually transition is rectangle, every time transition
The working modulus of deformation is controlled 25% or so, and lengthening coefficient should control between 1.30-1.35.
4. a kind of processing method of rectangle diplopore silver-bearing copper pipe according to claim 1, it is characterised in that：In step s 6,
Drawing external mold material selection carbide alloy YG 8, drawing internal model material selection speciality steel T10a, working surface hard chrome plating 0.03-
0.05mm, since product is rectangle double-hole tube, so every time drawing all uses double internal models and single external mold.
5. a kind of processing method of rectangle diplopore silver-bearing copper pipe according to claim 1, it is characterised in that：In step s 8,
Ensure straightness≤0.5mm/m, flatness≤1mm/m, torsion resistance≤1mm/m.
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| CN201610658979.0A CN106623488B (en) | 2016-08-04 | 2016-08-04 | A kind of processing method of rectangle diplopore silver-bearing copper pipe |
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| CN201610658979.0A CN106623488B (en) | 2016-08-04 | 2016-08-04 | A kind of processing method of rectangle diplopore silver-bearing copper pipe |
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| CN106623488B true CN106623488B (en) | 2018-07-31 |
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| CN108941227B (en) * | 2018-07-09 | 2020-04-10 | 中南大学 | Preparation process of aluminum-magnesium-scandium alloy pipe for aviation |
| CN110227906A (en) * | 2019-05-08 | 2019-09-13 | 东莞市欧莱溅射靶材有限公司 | A kind of corronil rotary target material and its production method |
| CN110465907B (en) * | 2019-08-12 | 2021-08-17 | 中国航空工业集团公司沈阳飞机设计研究所 | Cross-shaped cone-opening head and processing method thereof |
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| DE2918600A1 (en) * | 1979-05-09 | 1980-11-13 | Schmoele Metall R & G | HOLLOW PROFILE CONDUCTOR |
| CN2629858Y (en) * | 2003-06-18 | 2004-08-04 | 安阳钢铁股份有限公司 | Cold-drawn tube two-hole die and self-balance toothed plate |
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| CN105032982A (en) * | 2015-06-11 | 2015-11-11 | 沈阳东管电力科技集团股份有限公司 | Three-way hot pressing process |
| CN105363819A (en) * | 2015-12-08 | 2016-03-02 | 广西南南铝加工有限公司 | 4G base station aluminum alloy radiator profile extrusion mold |
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2016
- 2016-08-04 CN CN201610658979.0A patent/CN106623488B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2918600A1 (en) * | 1979-05-09 | 1980-11-13 | Schmoele Metall R & G | HOLLOW PROFILE CONDUCTOR |
| CN2629858Y (en) * | 2003-06-18 | 2004-08-04 | 安阳钢铁股份有限公司 | Cold-drawn tube two-hole die and self-balance toothed plate |
| CN101968976A (en) * | 2009-07-28 | 2011-02-09 | 济南宝世达实业发展有限公司 | Unequal wall thickness hollow wire of rotor winding and processing technology thereof |
| CN101773944A (en) * | 2010-01-28 | 2010-07-14 | 隆昌山川精密焊管有限责任公司 | Molding process for precision shaped pipe and cold drawing mold thereof |
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| CN105032982A (en) * | 2015-06-11 | 2015-11-11 | 沈阳东管电力科技集团股份有限公司 | Three-way hot pressing process |
| CN105363819A (en) * | 2015-12-08 | 2016-03-02 | 广西南南铝加工有限公司 | 4G base station aluminum alloy radiator profile extrusion mold |
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| CN106623488A (en) | 2017-05-10 |
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