CN105127221A - New preparing method of high-strength nanocrystalline aluminum pipe - Google Patents
New preparing method of high-strength nanocrystalline aluminum pipe Download PDFInfo
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- CN105127221A CN105127221A CN201510525726.1A CN201510525726A CN105127221A CN 105127221 A CN105127221 A CN 105127221A CN 201510525726 A CN201510525726 A CN 201510525726A CN 105127221 A CN105127221 A CN 105127221A
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- aluminum pipe
- pipe
- strength
- mold
- brilliant
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- 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
- B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
- B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes
- B21C1/22—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes specially adapted for making tubular articles
-
- 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
- B21C3/00—Profiling tools for metal drawing; Combinations of dies and mandrels
- B21C3/02—Dies; Selection of material therefor; Cleaning thereof
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Extraction Processes (AREA)
Abstract
The invention discloses a new preparing method of a high-strength nanocrystalline aluminum pipe. The new preparing method is characterized in that a high-strength thin-walled pipe can be prepared with low cost to replace a thick-walled pipe to be used, and meanwhile after the aluminum pipe is drawn through a round mold channel, second-pass drawing is carried out; the repeated plastic deformation of the aluminum pipe can be achieved, large deformation is finally accumulated, and the high-strength nanocrystalline aluminum pipe is obtained. A double-layer prestress ferrule structure is adopted in a designed round channel drawing mold, the strength of the round channel mold can be greatly improved, and the service life of the mold is prolonged. Due to the fact that the aluminum pipe is filled with tin melt, the distortion of the cross section of the pipe in the round mold channel drawing process is avoided, and meanwhile materials of the pipe are well fined through two-way stress; and the mechanical performance of the aluminum pipe is further improved, and high strength and good tenacity are achieved on the premise that high density is guaranteed.
Description
Technical field
The present invention relates to a kind of molding field of metal pipe material, especially relate to a kind of method and the mould of preparing the brilliant aluminum pipe of high-strength nano.
Background technology
Aluminum metal tubing possesses firm, corrosion resistant characteristic, easily processing and is connected, working plasticity is good, is therefore widely used in national economy.The major domain of aluminum pipe consumption is the aspects such as air-conditioner, refrigerator, water heater, automobile, air compressor machine, generating equipment and electric components and parts.Adopt extrusion technique can prepare heavy caliber thick wall tubing, the method adopts bar casting-bar to heat and hot extrusion-rolling and stretch forming, complex procedures, and energy consumption is high.Adopt continuously extruded method also can prepare small-bore aluminum pipe, the method is energy-efficient, reduce operation, but the continuously extruded requirement to extrusion mouth mould is high, only there are several industrial production lines in the world at present, the low extensive use that directly affects the method die life.
Current production aluminum pipe adopts casting production technology, directly produces hollow bloom by horizontal casting unit, then is rolled into the stretching pipe of certain specification by three-roller planetary pipe mill, batch into dish simultaneously.Owing to directly preparing aluminum pipe base, secondly three-roll planetary rolling a time deflection is up to more than 96%, and its production efficiency is also very high, and this technique is cold roll forming, does not need heating.After rolling, materials in the tube directly can carry out stretch forming, do not need intermediate annealing, significantly simplify processing technology, and compared with traditional extrusion process, casting-rolling technology continuity is strong, is more suitable for automation Continuous maching production line.But above-mentioned technique can significantly rise for preparing thin-wall pipes processing cost, need to add simultaneously a large amount of yttrium or noble metal, due to rare metal or noble metal price costly, the cost of high-strength thin-walled tubing is also very high.
Application number be 20110347299.4 and 201110374700.3 invention propose a kind of for tubing etc. channel variable cross-section extruding and the method for drawing, by by circle-ellipse-round and oval torsional variation, buildup of material can be made to be out of shape, the intensity of material can be improved, improve pipe performance, but adopt the method to change the cross section of die channel, the pipe fitting of acquisition can not keep original cross-sectional geometry of pipeline preferably.The present invention proposes a kind of circular channel mould Hubbing method, adopt circular channel mould Hubbing method can obtain the brilliant aluminum pipe of high-strength nano of endless size in theory, simultaneously owing to being original cross-sectional geometry that a kind of iso-cross-section channel deformation can keep pipeline, the low processing cost preparing light-wall pipe can be met, high strength linepipe can be obtained again, the use of Some substitute thick-walled pipe.Therefore, the present invention proposes a kind of circular channel mould hubbing improving aluminum pipe mechanical property and obtain nanocrystalline aluminum pipe.
Summary of the invention
The object of the invention is: for the strength problem, the low cost that overcome thin-wall aluminium pipe obtain longer size aluminum pipe, provide a kind of by circular channel mould hubbing, prepare the brilliant aluminum pipe of high-strength nano.
The method that a kind of circular channel mould hubbing that the present invention proposes prepares the nanocrystalline aluminum pipe of long size aluminum pipe comprises the following steps:
Step one, pipe prepares: the pipe by drawing is divided into two parts, and Part I is tube-drawing end portion: this part, by heal seal, arranges steel cable dop in port part simultaneously; Part II is the main drawing part of tubing: this part will obtain large sstrain, and tissue reaches nanometer, the mechanical property that final acquisition is excellent; Aluminum pipe to one end sealing injects tin melt and cools, and can obtain solid aluminum pipe, avoid the distortion of cross section producing tubing in the distortion of step 2 by the method.
Step 2, drawing prepares: after pipe is carried out phosphatization saponification, at outer surface of tube blank coating molybdenum bisuphide and mineral wax mixture, the steel cable dop of the Part I of ready pipe is connected with the steel wire tow line of draw-off gear, then under rope traction, pipe is put into circular channel mould.
Step 3, drawing deformation: pipe is passed through the drawing of circular channel mould with the hauling speed of 5mm/s-20mm/s by draw-off gear, repeat last drawing deformation after drawing once, enough strains can be accumulated by twice drawing, thus obtain the brilliant aluminum pipe of high-strength nano.
Step 4, obtain tubing: acquisitions high-strength nano crystalline substance aluminum pipe drawing end portion to be upwards vertically placed in heating tank roasting to 230 ° one hour, tin metal packing material is heated and all melts outflow, the tin material flowed out can Reusability, aluminum pipe has carried out stress relief annealing simultaneously, obtains the brilliant aluminum pipe of high-strength nano of good mechanical performance.
The present invention realizes the circular channel mould of aluminum pipe drawing deformation, comprises circular channel die, ground floor prestressing force gland, second layer prestressing force gland, and corresponding appurtenances steel cable dop and steel cable.
The invention has the beneficial effects as follows: adopt this kind of scheme, by circular channel mould drawing twice deformation method drawing aluminum pipe, inner filling tin metal material simultaneously, compression is applied to aluminum pipe inwall and can ensure that the shape of aluminum pipe cross section in drawing process and size do not change, the method can realize the microstructure nanometer of aluminum pipe, thus the brilliant aluminum pipe of the high-strength nano of excellent.Circular channel mold foundation achieves the continuous drawing distortion of aluminum pipe, had both achieved the nanometer of tube wall metal, and alleviated again the labour intensity handling workman, widened the range of application of thin-wall aluminium pipe.
accompanying drawing illustrates:
Here is described in detail specific embodiment of the invention scheme in conjunction with the accompanying drawings and embodiments.
Fig. 1 is the simple schematic diagram of processing technology of the present invention;
Fig. 2 is circular channel mould drawing process installation drawing of the present invention;
The extruded sample transmission electron microscope micrograph that Fig. 3 obtains;
Fig. 4 is the true stress and strain curve of drawing pipes sample.
Being labeled as in above-mentioned figure:
Fig. 1 is 1. circular channel dies of the simple schematic diagram of processing technology of the present invention, 2. extrusion pipe;
Fig. 2 is 1. circular channel dies of circular channel mould drawing process installation drawing of the present invention, 2. extrusion pipe, 3. ground floor die prestressing force lasso, 4. second layer die prestressing force lasso, 5. dop, 6. steel wire rope, 7. pre-stress die base.
Detailed description of the invention
The novel preparation method of the brilliant aluminum pipe of embodiment 1, a kind of high-strength nano
Pipe by drawing is pulled out end portion heal seal, steel cable dop is set in port part simultaneously; Aluminum pipe to one end sealing injects tin melt and cools, and can obtain solid aluminum pipe by the method.After pipe is carried out phosphatization saponification, at outer surface of tube blank coating molybdenum bisuphide and mineral wax mixture, the steel cable dop of the Part I of ready pipe is connected with the steel wire tow line of draw-off gear, then under rope traction, pipe is put into circular channel mould.Pipe is passed through the drawing of circular channel mould with the hauling speed of 10mm/s by draw-off gear, last drawing deformation is repeated again once after drawing, then brilliant for acquisition high-strength nano aluminum pipe drawing end portion to be upwards vertically placed in heating tank after roasting to 230 ° insulation one hour, tin metal packing material is heated and all melts outflow, also tackle aluminum pipe simultaneously mutually and carried out stress relief annealing technique, obtain the brilliant aluminum pipe of high-strength nano of good mechanical performance.
Can find out that the average crystal grain tissue of aluminum pipe is the nano material being less than 600nm from the nanocrystalline aluminium drawing pipes sample transmission electron microscope micrograph shown in Fig. 3.From the nanocrystalline copper drawing pipes sample stretching true stress-true strain curve shown in Fig. 4, can find out, intensity comparatively conventional specimen improves 202%, and according to Hall-Pech formula, the crystallite dimension of material is less, and its external macro-mechanical property is higher.
The average crystal grain tissue of aluminum pipe is the nano material being less than 600nm, simultaneously the nanocrystalline copper drawing pipes sample intensity of drawing comparatively conventional specimen improve 202%.
The brilliant aluminum pipe of a kind of high-strength nano provided by the invention can adopt simple wire drawing process equipment, and the material of acquisition has high hardness and intensity, keeps good toughness simultaneously.Therefore, material of the present invention has potential using value, has good advantage especially in Aeronautics and Astronautics and nuclear power field.
Die circular channel mould road of the present invention structure; all prior art can be adopted; the present invention is not limited to above-mentioned cited concrete form of implementation, and all those skilled in the art, without the getable improvement of creative work, all belong in protection scope of the present invention.
Claims (3)
1. the novel preparation method of the brilliant aluminum pipe of high-strength nano, low cost can prepare the use of high-strength thin-walled tubing replacement thick-wall tube, it is characterized in that: adopt circular channel mould Hubbing method can obtain the brilliant aluminum pipe of high-strength nano of endless size in theory, simultaneously owing to being original cross-sectional geometry that a kind of iso-cross-section channel deformation can keep pipeline, the low processing cost preparing light-wall pipe can be met, high strength linepipe can be obtained again, the use of Some substitute thick-walled pipe.
2. the novel preparation method of the brilliant aluminum pipe of a kind of high-strength nano according to claim 1, it is characterized in that: pipe is passed through the drawing of circular channel mould with the hauling speed of 10mm/s by draw-off gear, last drawing deformation is repeated again once after drawing, the plastic deformation repeatedly of aluminum pipe can be realized, final accumulation large deformation, obtains the brilliant aluminum pipe of high-strength nano.
3. the novel preparation method of the brilliant aluminum pipe of a kind of high-strength nano according to claim 1, is characterized in that: the average crystal grain tissue of aluminum pipe is the nano material being less than 600nm, the nanocrystalline copper drawing pipes sample intensity comparatively conventional specimen raising 202% of drawing simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510525726.1A CN105127221A (en) | 2015-08-25 | 2015-08-25 | New preparing method of high-strength nanocrystalline aluminum pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510525726.1A CN105127221A (en) | 2015-08-25 | 2015-08-25 | New preparing method of high-strength nanocrystalline aluminum pipe |
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| CN105127221A true CN105127221A (en) | 2015-12-09 |
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| CN201510525726.1A Pending CN105127221A (en) | 2015-08-25 | 2015-08-25 | New preparing method of high-strength nanocrystalline aluminum pipe |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106077184A (en) * | 2016-06-17 | 2016-11-09 | 山东建筑大学 | A kind of preparation method of high-strength aluminum alloy nanometer bend pipe |
| CN110306135A (en) * | 2019-07-10 | 2019-10-08 | 山东建筑大学 | A kind of method that universal rectangular equal channel pressings prepare nano-aluminium alloy material |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003001321A (en) * | 2001-06-19 | 2003-01-07 | Mitsui Mining & Smelting Co Ltd | Device and method for plastic forming |
| CN101322985A (en) * | 2008-07-22 | 2008-12-17 | 西北有色金属研究院 | Warm state drawing method for processing medical magnesium alloy fine-radial thin-wall pipes |
| CN101693264A (en) * | 2009-10-16 | 2010-04-14 | 江苏大学 | Large equal channel angular large-strain extrusion die |
| CN102284536A (en) * | 2011-05-30 | 2011-12-21 | 哈尔滨工业大学 | Preparation device and method of light-alloy semisolid blanks by equal-channel reciprocating extrusion and spheroidization |
| CN103639215A (en) * | 2013-12-06 | 2014-03-19 | 山东建筑大学 | Method for preparing high-strength nanocrystalline copper pipe |
-
2015
- 2015-08-25 CN CN201510525726.1A patent/CN105127221A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003001321A (en) * | 2001-06-19 | 2003-01-07 | Mitsui Mining & Smelting Co Ltd | Device and method for plastic forming |
| CN101322985A (en) * | 2008-07-22 | 2008-12-17 | 西北有色金属研究院 | Warm state drawing method for processing medical magnesium alloy fine-radial thin-wall pipes |
| CN101693264A (en) * | 2009-10-16 | 2010-04-14 | 江苏大学 | Large equal channel angular large-strain extrusion die |
| CN102284536A (en) * | 2011-05-30 | 2011-12-21 | 哈尔滨工业大学 | Preparation device and method of light-alloy semisolid blanks by equal-channel reciprocating extrusion and spheroidization |
| CN103639215A (en) * | 2013-12-06 | 2014-03-19 | 山东建筑大学 | Method for preparing high-strength nanocrystalline copper pipe |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106077184A (en) * | 2016-06-17 | 2016-11-09 | 山东建筑大学 | A kind of preparation method of high-strength aluminum alloy nanometer bend pipe |
| CN110306135A (en) * | 2019-07-10 | 2019-10-08 | 山东建筑大学 | A kind of method that universal rectangular equal channel pressings prepare nano-aluminium alloy material |
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Application publication date: 20151209 |