CN105689424A - High-pressure rotary compression-extending extrusion large-plasticity deformation and forming device - Google Patents
High-pressure rotary compression-extending extrusion large-plasticity deformation and forming device Download PDFInfo
- Publication number
- CN105689424A CN105689424A CN201610059156.6A CN201610059156A CN105689424A CN 105689424 A CN105689424 A CN 105689424A CN 201610059156 A CN201610059156 A CN 201610059156A CN 105689424 A CN105689424 A CN 105689424A
- Authority
- CN
- China
- Prior art keywords
- compression
- section
- expending
- diameter
- forming device
- 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.)
- Granted
Links
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
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/21—Presses specially adapted for extruding metal
-
- 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
- B21C27/00—Containers for metal to be extruded
-
- 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
- B21C29/00—Cooling or heating work or parts of the extrusion press; Gas treatment of work
- B21C29/02—Cooling or heating of containers for metal to be extruded
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Of Metal (AREA)
Abstract
The invention provides a large-plasticity deformation and forming device. In order to solve the technical problems, the large-plasticity deformation and forming device capable of achieving continuous production is provided. According to the technical scheme, the high-pressure rotary compression-extending extrusion large-plasticity deformation and forming device comprises a rotary extruding machine, a compression-extending extrusion barrel and an extrusion die; a heating device is arranged outside the compression-extending extrusion barrel which is fixed to a base through a rack; the compression-extending extrusion barrel is internally provided with a compression-extending cavity which is composed of a compression section and an extending section, the compression section is located between a feeding section and the extending section, and the diameter of the compression section is smaller than the diameter of the feeding section and the diameter of the extending section; the compression section is connected with the feeding section and the extending section through conical transition cavities; the extrusion die is arranged inside the compression-extending extrusion barrel and located at the tail end of the extending section; the rotary extruding machine is also fixed to the base, and the diameter of an extruding rod of the rotary extruding machine is matched with that of the feeding section.
Description
Technical field
One high-pressure rotary compression-expending extrusion large plastometric set forming device of the present invention, belongs to metal large plastometric set processing unit (plant) technical field。
Background technology
Along with the fast development of Aero-Space, military affairs and the vehicles, the performance of material is had higher requirement, therefore prepare the focus that high-performance metal materials is current research。The main path improving material mechanical performance at present has the methods such as alloying, heat treatment, working hardening and refined crystalline strengthening。Research shows that relying on a or two kind of strengthening mechanism merely is limited to improve the combination property of material, by multiple strengthening mechanism organic assembling, can not only the Potential performance of abundant excavated material, be also the inexorable trend that develops of material science。Large plastometric set method has stronger grain refining capability, by strong detrusion, Polycrystalline Metals material inside organization is made to be refined to submicron order (100nm-1.0 μm) even nanoscale (< 100nm), compared with traditional material, super fine crystal material has excellent mechanical property。Large plastometric set makes material internal high-angle boundary proportion increase simultaneously, improves the performance of material from many aspects。Therefore, the strengthening of large plastometric set alloy is the coefficient result of multiple strengthening mechanism, and strengthening effect is notable。
Current large plastometric set method mainly has: Equal-channel Angular Pressing (ECAP), Processed by Accumulative Roll-bonding and multiway forging etc.。ECAP is of greatest concern and with fastest developing speed in large plastometric set method, its principle be by sample under certain extruding force effect by two axes intersect and the equal and angled passage of sectional dimension, make sample generation pure shear deform, and then reach the purpose of crystal grain thinning。At present, increasing new E CAP is developed, such as side extruding repeatedly, continuous shear stress and equal channel angular rolling etc.。Although ECAP method attracts wide attention, but still suffer from many problems at present:
(1) ECAP production efficiency is not high。Result of study shows, in order to make material grains refine, improves material property, generally to extrude through multi-pass ECAP。But ECAP process itself is discontinuous, therefore, pilot process is complicated, and production efficiency is low；
(2) ECAP die cost is higher。In ECAP extrusion process, the abrasion of mould is relatively larger, and processing cost is higher；
(3) scantling is prepared limited。Restriction due to be squeezed mould and pressure ram size, it is difficult to preparation large scale goods；
(4) test waste of raw materials ratio is more serious。Can extend along the direction of extrusion after sample extruding, when the sample of elongation is then through ECAP, it is easy to ftracture, come off, cause waste of material；
(5) specimen surface quality can be impacted。Experiment is generally adopted MoS2 as lubricant, and black MoS2 granule can be clamp-oned in sample surface after extrusion, and surface cleanness degree can be affected。
Therefore develop short route, large scale can be prepared and the novel big plastic forming device of multiple section goods, significant。
Summary of the invention
The present invention overcomes the deficiencies in the prior art, technical problem to be solved to be to provide one to be capable of quantity-produced large plastometric set forming device。
For solving above-mentioned technical problem, the technical solution adopted in the present invention is: a kind of high-pressure rotary compression-expending extrusion large plastometric set forming device, including rotary squeezing machine, compression-expending extrusion cylinder and extrusion die；Being provided with heater outside described compression-expending extrusion cylinder, described heater is for giving the heating of compression-expending extrusion cylinder；Described compression-expending extrusion cylinder is fixed on base by frame；Described compression-expending extrusion cylinder is internally provided with compression-extended cavity, feed zone and extrusion die, described compression-extended cavity is made up of compression section and expanding section, compression section is between the feed zone and expanding section of compression-expending extrusion cylinder, and the diameter of compression section is all less than the diameter of the diameter of described feed zone and expanding section；Compression section is connected respectively through one section of tapering transition chamber with feed zone and expanding section；Extrusion die is arranged on compression-expending extrusion cylinder inside and is positioned at the end of expanding section；Described rotary squeezing machine is also secured on base, and the diameter of the pressure ram of rotary squeezing machine is identical with the diameter of described feed zone, and described pressure ram can extend in feed zone。
Work process is as follows: start heater, compression-expending extrusion cylinder is preheated, raw material is thrown in simultaneously in feed zone, carry out heat-insulation preheating, now to stretch into feed zone place in place for pressure ram, then starts rotary squeezing machine, is promoted forward by pressure ram under high speed rotating, raw material is rotating and under the dual function of extruding, being pressed into compression section gradually, the material of compression section enters expanding section therewith and is expanded, and the raw material after extension passes through extrusion die molding under squeezing action。
Raw material is before eventually entering into the shaping part of mould, under the high speed rotating effect of pressure ram, carry out turn distortion always, and enter the compression-expansion process of overcompression-extended cavity, realize the large plastometric set of raw material, high-pressure rotary and compression-expending extrusion combine, it is achieved that efficiently prepare Ultra-fine Grained high performance alloys goods。
Meanwhile, the forming process of the present invention need not be interrupted, for the alloy product of certain material, size, requirement according to performance, have only to, by suitable simulation and test, just can determine that suitable compression-ratio and rotary rpm, once-forming prepared product can be realized by assembly of the invention。Preparation process is simple, and production efficiency significantly improves。
Additionally need not adding lubricant etc., product apparent mass is outstanding。
Accordingly, the large plastometric set forming device of the present invention also should include the cooling system that the section bar of extrusion is shaped and cooled down and the control system that the work process and technological parameter to whole device is set and adjusts。
The type of cooling system and control system can be designed according to needs of production and select。
The purpose of heater is to heat to compression-expending extrusion cylinder, and simplest structure includes resistance wire and refractory brick, and refractory brick is covered on the outer wall of compression-expending extrusion cylinder and forms refractory brick coating, and resistance wire is spirally coiled in refractory brick coating。But what be based on heater arranges purpose, it is also possible to select other kinds of mode of heating and corollary apparatus。
In order to heater not being constituted impact, frame can select the structure of routine, corner including front shoe, rear fixed plate and fixed cross beam, front shoe and rear fixed plate is connected by four fixed cross beams, is fixed between front shoe and rear fixed plate by compression-expending extrusion cylinder。
The core texture of the present invention is compression-expending extrusion cylinder, and topmost is exactly compression section and expanding section。Based on conventional profile size, the diameter of compression section can select within the scope of 10-390mm, and accordingly, the diameter of expanding section then selects within the scope of 20-400mm；The diameter of feed zone can also select within the scope of 20-400mm, simultaneously, it is necessary to stretches into the diameter preferably 0.2mm less of the diameter of feed zone of pressure ram in feed zone。The inlet diameter of extrusion die should be consistent with the diameter of expanding section。
The material of pressure ram, recipient and extrusion die, performance requirement etc., it is possible to carry out selecting and designing according to the character of the raw material generally processed。Such as: pressure ram material optional H13,3Cr2W8V, 3Cr3Mo3W2V, Cr4W5Mo2V。Optional H13,3Cr2W8V, 3Cr3Mo3W2V, Cr4W5Mo2V mould steel of compression-expending extrusion cylinder material。Extrusion die material optional H13,3Cr2W8V, 3Cr3Mo3W2V, Cr4W5Mo2V。
Compared with prior art the invention have the advantages that。
1, high-pressure rotary and compression-expending extrusion are combined, it is achieved that efficiently prepare Ultra-fine Grained high performance alloys goods。2, forming process temperature is controlled, it is achieved that the stability of forming process, also achieves the control to goods interior tissue simultaneously。
3, cost is low, and technological process is short, it is easier to realize industrialized production。
4, large scale ultrafine grain metal goods can be prepared continuously。
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described。
Fig. 1 is high-pressure rotary compression-expending extrusion large plastometric set forming device schematic diagram。
Fig. 2 is heater schematic diagram。
Fig. 3 is the Al-0.5Sc alloy pipe and interior tissue thereof prepared: (a) recipient temperature 300 DEG C, and extrusion speed is 5mm/min, and cooling water flow is 15L/min, the Ultra-fine Grained alloy pipe of preparation；B interior tissue that () this tubing is corresponding。
In figure: 1 is rotary squeezing machine, 2 is pressure ram, and 3 is frame, and 4 is heater, and 5 is compression-expending extrusion cylinder, and 6 is extrusion die, and 7 is cooling system, and 8 is controller, and 9 is base, and 10 is resistance wire, and 11 is refractory brick。
Detailed description of the invention
Below in conjunction with specific embodiment, the invention will be further described。
Embodiment 1
As depicted in figs. 1 and 2, a kind of high-pressure rotary compression-expending extrusion large plastometric set forming device, including rotary squeezing machine 1, compression-expending extrusion cylinder 5 and extrusion die 6；The outside heater 4 that is provided with of described compression-expending extrusion cylinder 5, described heater 4 heats for giving compression-expending extrusion cylinder 5；Described compression-expending extrusion cylinder 5 is fixed on base 9 by frame 3；Described compression-expending extrusion cylinder 5 is internally provided with compression-extended cavity, described compression-extended cavity is made up of compression section and expanding section, compression section is between the feed zone and expanding section of compression-expending extrusion cylinder 5, and the diameter of compression section is all less than the diameter of the diameter of described feed zone and expanding section；Compression section is connected respectively through one section of tapering transition chamber with feed zone and expanding section；Extrusion die 6 is arranged on compression-expending extrusion cylinder 5 inside and is positioned at the end of expanding section；Described rotary squeezing machine 1 is also secured on base 9, and the diameter of the pressure ram 2 of rotary squeezing machine 1 coincide with the diameter of described feed zone, and described pressure ram 2 can extend in feed zone；
Also include cooling system 7 and control system 8；Described cooling system 7 is for shaping to the section bar extruded through extrusion die 6 and cool down；Described control system 8 is for controlling setting and the regulation and control of large plastometric set forming device action and parameter；
Described heater 4 includes resistance wire 10 and refractory brick 11, and refractory brick 11 is covered on the outer wall of compression-expending extrusion cylinder 5 and forms refractory brick coating, and resistance wire 10 is spirally coiled in refractory brick coating；
Described frame 3 is included the corner of front shoe, rear fixed plate and fixed cross beam, front shoe and rear fixed plate and is connected by four fixed cross beams, and described compression-expending extrusion cylinder 5 is fixed between front shoe and rear fixed plate。
Embodiment 2
Apparatus of the present invention are adopted to prepare Al-0.5Sc alloy Ultra-fine Grained tubing step as follows:
The first step: install shaping dies, opens cooling system。
Second step: open compression-expending extrusion cylinder heater, by recipient heating temperatures to 300 DEG C；
3rd step: Al-0.5Sc alloy is put into recipient, 300 DEG C of insulation 10min；
4th step: start rotary squeezing machine, extrusion speed is 5mm/min；
5th step: the goods of preparation are cooled down, and cooling water flow is 15L/min。
Utilize Ultra-fine Grained alloy pipe structure property prepared by this device excellent。
Above in conjunction with accompanying drawing, embodiments of the invention are explained in detail, but the present invention is not limited to above-described embodiment, in the ken that those of ordinary skill in the art possess, it is also possible under the premise without departing from present inventive concept, make various change。
Claims (7)
1. a high-pressure rotary compression-expending extrusion large plastometric set forming device, it is characterised in that: include rotary squeezing machine (1), compression-expending extrusion cylinder (5) and extrusion die (6)；Described compression-expending extrusion cylinder (5) is outside is provided with heater (4), and described heater (4) is for giving compression-expending extrusion cylinder (5) heating；Described compression-expending extrusion cylinder (5) is fixed on base (9) by frame (3)；Described compression-expending extrusion cylinder (5) is internally provided with compression-extended cavity, feed zone and extrusion die (6), described compression-extended cavity is made up of compression section and expanding section, compression section is positioned between feed zone and the expanding section of compression-expending extrusion cylinder (5), and the diameter of compression section is all less than the diameter of the diameter of described feed zone and expanding section；Compression section is connected respectively through one section of tapering transition chamber with feed zone and expanding section；Extrusion die (6) is arranged on the end of expanding section；Described rotary squeezing machine (1) is also secured on base (9), and the diameter of the pressure ram (2) of rotary squeezing machine (1) coincide with the diameter of described feed zone, and described pressure ram (2) can extend in feed zone。
2. a kind of high-pressure rotary compression-expending extrusion large plastometric set forming device according to claim 1, it is characterised in that: also include cooling system (7) and control system (8)；Described cooling system (7) is for shaping to the section bar extruded through extrusion die (6) and cool down；Described control system (8) is for controlling setting and the regulation and control of large plastometric set forming device action and parameter。
3. a kind of high-pressure rotary compression-expending extrusion large plastometric set forming device according to claim 1, it is characterized in that: described heater (4) includes resistance wire (10) and refractory brick (11), refractory brick (11) is covered on the outer wall of compression-expending extrusion cylinder (5) and forms refractory brick coating, and resistance wire (10) is spirally coiled in refractory brick coating。
4. a kind of high-pressure rotary compression-expending extrusion large plastometric set forming device according to claim 1, it is characterized in that: described frame (3) includes front shoe, rear fixed plate and fixed cross beam, the corner of front shoe and rear fixed plate is connected by four fixed cross beams, and described compression-expending extrusion cylinder (5) is fixed between front shoe and rear fixed plate。
5. a kind of high-pressure rotary compression-expending extrusion large plastometric set forming device according to claim 1, it is characterised in that: the diameter of feed zone is 20-400mm, and the gap between feed zone and pressure ram is 0.1mm。
6. a kind of high-pressure rotary compression-expending extrusion large plastometric set forming device according to claim 1, it is characterised in that: the diameter of compression section is 10-390mm。
7. a kind of high-pressure rotary compression-expending extrusion large plastometric set forming device according to claim 1, it is characterised in that: the diameter of expanding section is 20-400mm。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610059156.6A CN105689424B (en) | 2016-01-28 | 2016-01-28 | A kind of high-pressure rotary companding extrudes large plastometric set building mortion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610059156.6A CN105689424B (en) | 2016-01-28 | 2016-01-28 | A kind of high-pressure rotary companding extrudes large plastometric set building mortion |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105689424A true CN105689424A (en) | 2016-06-22 |
| CN105689424B CN105689424B (en) | 2017-11-10 |
Family
ID=56229779
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610059156.6A Active CN105689424B (en) | 2016-01-28 | 2016-01-28 | A kind of high-pressure rotary companding extrudes large plastometric set building mortion |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105689424B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109226750A (en) * | 2018-10-26 | 2019-01-18 | 中国航发北京航空材料研究院 | Quick forming method for the powder metallurgy titanium alloy blade prefabricated blank with damping boss |
| CN110369542A (en) * | 2019-08-14 | 2019-10-25 | 江苏大学 | A kind of continuous expanding extruding mold |
| CN116140586A (en) * | 2023-03-13 | 2023-05-23 | 池州市安安新材科技有限公司 | Extruder for extrusion molding of high-strength and high-toughness aluminum alloy melt and extrusion method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0452024A (en) * | 1990-06-15 | 1992-02-20 | Leotec:Kk | Method for controlling extruding work for metal |
| RU2277992C2 (en) * | 2004-09-06 | 2006-06-20 | Риф Гайзуллович Баймурзин | Fine-grain structure blank producing method |
| CN101767120A (en) * | 2010-01-06 | 2010-07-07 | 哈尔滨理工大学 | Device and method for preparing fine-grained material by directly extruding continuous variable cross section |
| CN101966536A (en) * | 2010-09-22 | 2011-02-09 | 上海交通大学 | Torsion type reciprocating extrusion device and process method thereof |
| CN202343614U (en) * | 2011-12-06 | 2012-07-25 | 无锡乐普金属科技有限公司 | Secondary extruding die of tungsten alloy |
| CN104551545A (en) * | 2014-11-18 | 2015-04-29 | 西安交通大学 | Strain-induced semi-solid forming device and process for fine-grained bearing pad |
-
2016
- 2016-01-28 CN CN201610059156.6A patent/CN105689424B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0452024A (en) * | 1990-06-15 | 1992-02-20 | Leotec:Kk | Method for controlling extruding work for metal |
| RU2277992C2 (en) * | 2004-09-06 | 2006-06-20 | Риф Гайзуллович Баймурзин | Fine-grain structure blank producing method |
| CN101767120A (en) * | 2010-01-06 | 2010-07-07 | 哈尔滨理工大学 | Device and method for preparing fine-grained material by directly extruding continuous variable cross section |
| CN101966536A (en) * | 2010-09-22 | 2011-02-09 | 上海交通大学 | Torsion type reciprocating extrusion device and process method thereof |
| CN202343614U (en) * | 2011-12-06 | 2012-07-25 | 无锡乐普金属科技有限公司 | Secondary extruding die of tungsten alloy |
| CN104551545A (en) * | 2014-11-18 | 2015-04-29 | 西安交通大学 | Strain-induced semi-solid forming device and process for fine-grained bearing pad |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109226750A (en) * | 2018-10-26 | 2019-01-18 | 中国航发北京航空材料研究院 | Quick forming method for the powder metallurgy titanium alloy blade prefabricated blank with damping boss |
| CN109226750B (en) * | 2018-10-26 | 2021-02-09 | 中国航发北京航空材料研究院 | Rapid forming method for powder titanium alloy blade prefabricated blank with damping boss |
| CN110369542A (en) * | 2019-08-14 | 2019-10-25 | 江苏大学 | A kind of continuous expanding extruding mold |
| CN116140586A (en) * | 2023-03-13 | 2023-05-23 | 池州市安安新材科技有限公司 | Extruder for extrusion molding of high-strength and high-toughness aluminum alloy melt and extrusion method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105689424B (en) | 2017-11-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105728493B (en) | A kind of combined type, which is turned round, squeezes the compound large plastometric set device of pier and manufacturing process | |
| US10265746B2 (en) | Rotary extrusion producing method for producing inner ring rib with large aspect ratio formed of hollow billet | |
| US10265747B2 (en) | Rotary extrusion producing mold for producing inner ring rib with large aspect ratio formed of hollow billet | |
| CN106825098B (en) | A kind of differential-velocity extrusion shaping dies of magnesium alloy high-performance cup shell | |
| CN101279331B (en) | Wire hydrostatic extrusion device and method for extruding superfine grain wire using the device | |
| CN104889186B (en) | A kind of positive and negative Compound Extrusion manufacturing process of ZrTiAlV alloys electric field-assisted | |
| CN106607468A (en) | Differential-speed extrusion forming method of magnesium alloy high performance cup-shaped piece | |
| CN104588428A (en) | Circular channel and corner based extruding and moulding mold and circular channel and corner based extruding and moulding method of magnesium alloy cup-shaped component | |
| CN101406906A (en) | Method for preparing magnesium alloy section bar by continuous corner shearing and squeezing shaping and mold | |
| CN2690068Y (en) | Device for preparing super fine grain crystal pipe by equal passage corner extrusion | |
| CN104624693A (en) | Bidirectional extrusion mould and extrusion moulding method for double-layer metal plate and strip or sectional material | |
| CN105689424A (en) | High-pressure rotary compression-extending extrusion large-plasticity deformation and forming device | |
| CN106140852A (en) | A kind of high-strength tenacity carefully brilliant light-alloy tubing prepare mould and preparation method thereof | |
| CN108097733A (en) | A kind of crowded torsion Compound Machining mold and method that multi-direction shearing can be achieved | |
| CN108704949A (en) | A kind of magnesium alloy channel corner hot-extrusion mold and its heating device | |
| Sadasivan et al. | Severe plastic deformation of tubular materials–Process methodology and its influence on mechanical properties–A review | |
| CN111495998B (en) | Metal and metal matrix composite forming device | |
| CN109332411B (en) | Tube extrusion forming device for continuous and repeated extrusion of nonferrous metal | |
| CN106862863A (en) | A kind of preparation processing method of the ultra-thin titanium alloy shell of great diameter and long | |
| CN205463670U (en) | Big plastic deformation shaper | |
| CN108405651B (en) | A kind of semisolid continuous extrusion production copper alloy wire method | |
| CN212238643U (en) | Full-automatic metal material grain refinement and forming integrated preparation device | |
| CN109675947A (en) | A kind of continuous soldering pressing method of the repetition of Refining Mg Alloy crystal grain | |
| CN103302128A (en) | Method for processing high-multiple sunflower heat radiator aluminum section | |
| CN1332058C (en) | Prepn of rod superfine crystal material |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |