CN102274954B - Process for preparing semisolid metal slurry or blank by reducing and grading strong cooling - Google Patents
Process for preparing semisolid metal slurry or blank by reducing and grading strong cooling Download PDFInfo
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- CN102274954B CN102274954B CN 201010199589 CN201010199589A CN102274954B CN 102274954 B CN102274954 B CN 102274954B CN 201010199589 CN201010199589 CN 201010199589 CN 201010199589 A CN201010199589 A CN 201010199589A CN 102274954 B CN102274954 B CN 102274954B
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Abstract
The invention relates to a process for preparing semisolid metal slurry or blank by reducing, grading and strong cooling. The process comprises the following steps of: connecting two steel pipes with different diameters in a water-cooling jacket; and rapidly cooling metal liquid passing through the steel pipes respectively by utilizing different flow rates of circulating water according to the different states of the metal liquid. The process disclosed by the invention has the advantages of less investment, simpleness in equipment manufacturing, no secondary oxidation in the cooling process of the metal liquid, stable process, easiness in control and master, no limit to the size of the semisolid metal blank, wide application range, capability of ensuring the quality of the semisolid metal blank, and the like.
Description
Technical field
The present invention relates to the technology of strong cold preparation semi-solid metal slurry of reducing classification or blank, belong to the metal forming technical field.
Background technology
At present, Domestic Automotive Industry is just from the strategic shift of truck to light-duty vehicle and car development.Foundry goods occupies critical role in auto industry, casting weight accounts for the 20%--30% of automotive dead weight.Current, along with going from bad to worse of global energy shortage and ecological environment, require the low cry of in light weight, the oil consumption province of automobile and exhaust emissions more and more higher.Therefore, developing of automobile industry trend is to replace traditional ferrous material with light-alloy, as steel and cast iron, realizes the lightweight and energy-conservationization of automobile.Therefore, developed country's auto industry is increasing to the demand of light metals such as aluminium alloy and magnesium alloy.Aluminium alloy castings accounts for about 50% of whole foundry goods total amount in calendar year 2001 in the car industry, even all-aluminium engine and all-aluminium body occur.In pillar industry in national economy is formally listed developing of automobile industry by China now, can believe in the near future, the automobile of China will increase greatly with the demand of aluminium alloy castings, and the aluminium alloy castings portion that uses now is less than 1/4th of developed country.The vital part that China's four big foundry goods such as cylinder cover, brake pump and gear box of introducing car model (Santana, Jetta, Citroen zx, Xiali) are production domesticization.The domestic production aluminium casting adopts complicated low-pressure casting process mostly, and percent defective is up to 25%, and this craft rate of production is low.Also weak to coagulating property and the research of casting technique thereof of aluminium alloy castings in casting mold.
The semi-solid-state metal process technology is a kind of metal forming new technology that grows up the seventies in 20th century, the non-dendrite semi-solid-state metal blank that it will prepare, and semisolid is pushed or casting forming through being heated to once more.Because semi-solid-state metal has been the solid-liquid two-phase coexistent before shaping, be easy to the homogeneous distortion, and turbulent flow can not take place and steadily fill type in full-bodied semi solid slurry when filling, the primary phase of semi-solid-state metal blank is that the spherical resistance of deformation that makes significantly descends simultaneously, makes the processing characteristics of foundry goods and inherent quality all be better than conventional foundry goods; This technology can also be made nearly end form goods.
The process route of semi-solid-state shaping has two: one is that the semi-solid metal slurry that will obtain directly carries out semi-solid-state shaping under the condition that keeps its semi-solid temperature, is commonly called rheocasting (Rheocasting); Another is after the semi solid slurry cooled and solidified is become blank, according to the product size blanking, to reheat semi-solid temperature again, forms processing then, is commonly called thixotropic forming (Thixoforming).In actual industrial production, the main a kind of technology in back that adopts.Research and develop the new technology of successfully several direct thixotropic formings (Thixomolding) recently again.
The most important condition that realizes two kinds of above-mentioned semi-solid-state shaping methods is to obtain desirable semi-solid metal slurry, for this reason, carried out extensive studies and competition both at home and abroad, existing at present pulping process has following several: methods such as new M I T technology, cooling chute method, double helix rheology injection molding method, shearing-cooling-rolling, different liquids mixing method, near liquidus casting, electromagnetic agitation and strain-induced fusing activation.When though these methods respectively have different characteristics, in suitability for industrialized production, also there is certain difficulty, oxidation (cooling chute method, shearing-cooling-rolling) as metal liquid, the difficulty of technology controlling and process is big, the poor stability (as near liquidus casting, different liquids mixing method) of technology, the investment of equipment is big, billet size is restricted (activating as electromagnetic agitation and strain-induced fusing), some technology also is subjected to the influence of technical monopoly factor simultaneously, and these factors have caused the preparation cost of semi solid slurry or blank higher.
Summary of the invention
The objective of the invention is at the prior art defective, the technology of strong cold preparation semi-solid metal slurry of a kind of reducing classification or blank is provided, it has small investment, and equipment making is simple, characteristics such as easy to control and process stabilizing.
The present invention realizes by the following technical solutions, connects the steel pipe of two kinds of different-diameters in the water-cooled overcoat, uses the metal liquid of the quick cooling of recirculated water of different flow by steel pipe respectively according to the different state of metal liquid.Its processing step is as follows:
(1) be 8～25mm with molten metal liquid in the tundish by diameter, it is cold by force that length is that the cooling pipe of 200～600mm carries out one-level;
(2) will enter into diameter after metal liquid after the one-level cooling is by connector is 16～35mm, and it is cold by force that length is that the cooling pipe of 200～600mm carries out secondary;
(3) with each second 5～2000 milliliters flow respectively the I and II steel pipe is applied cooling medium (as recirculated water) outward, strengthen cooling to the metal liquid in the steel pipe;
(4) according to the composition of metal liquid, the temperature of tundish liquid and the temperature in the connector, regulate the flow of I and II cooling medium respectively, make the temperature of the metal liquid in the connector reach above 5～15 degrees centigrade of this alloy liquid phase line temperature, and the outlet temperature of secondary cooling tube reaches following 1～15 degree centigrade of this alloy liquid phase line temperature, forms the slurry of semisolid moulding or the blank of formation semisolid moulding in mold.
Advantage of the present invention and beneficial effect are:
Characteristics such as (1) technology has small investment, and equipment making is simple;
(2) do not have secondary oxidation in the metal liquid cooling procedure, guarantee the quality of semi-solid-state metal blank; (3) process stabilizing, grasp easy to control;
(4) the semi-solid-state metal billet size is unrestricted;
(5) applied widely.
Description of drawings
Accompanying drawing is the strong cold preparation semi-solid-state metal blank isolated plant work structuring schematic diagram of reducing classification of the present invention;
Water inlet 14. semisolid shaping blanks 15. molds of the delivery port 12. secondary water cold sleeves 13. secondary water cold sleeves of the water inlet 8. connectors 9. thermocouples 10. secondary cooling pipes 11. secondary water cold sleeves of the delivery port 6. one-level water cold sleeves 7. one-level water cold sleeves of 1. tundish, 2. thermocouples, 3. metal liquids, 4. one-level cooling pipes, 5. one-level water cold sleeves among the figure.
The specific embodiment
As shown in drawings, the isolated plant that the present invention adopts is to connect a less cooling pipe of diameter (4) in the cooling jacket (6) of one-level cooling, connect the big cooling pipe (10) of a diameter in the cooling jacket (12) of secondary cooling, two-stage links together by connector.Its process is: the metal liquid (3) in the tundish (1) enters in the connector (9) by one-level cooling pipe (4) cooling, recirculated cooling water (7), (5) quick cool metal liquid, make the metal liquid temperature that enters into connector reach above 5～15 degrees centigrade of the liquidus curve of this metal, metal liquid in the connector (9) enters in the mold by secondary cooling pipe (10) cooling, recirculated cooling water (13), (11) quick cool metal liquid, make the metal liquid temperature that enters into mold reach following 1～15 degree centigrade of the liquidus curve of this metal, form the slurry of semisolid moulding or in mold, form semi-solid blank (13).
Specific implementation method is as follows:
Embodiment 1ZAlSi7Mg alloy
The chemistry of alloy becomes: Si:6.91; Mg:0.32 all the other be: Al
The diameter that adopts the one-level cooling pipe is that 10 millimeters, length are 200 millimeters and carry out cold by force, the flow of cooling water is: 40 milliliters of per seconds, the diameter of secondary cooling pipe is that 16 millimeters, length are 200 millimeters and carry out cold by force, the flow of cooling water is: 30 milliliters of per seconds obtain the semi-solid-state shaping blank of this alloy.
Embodiment 2ZAlSi7Mg alloy
The chemistry of alloy becomes: Si:6.91; Mg:0.32 all the other be: Al
The diameter that adopts the one-level cooling pipe is that 14 millimeters, length are 300 millimeters and carry out cold by force, the flow of cooling water is: 90 milliliters of per seconds, the diameter of secondary cooling pipe is that 20 millimeters, length are 300 millimeters and carry out cold by force, the flow of cooling water is: 60 milliliters of per seconds obtain the semi-solid-state shaping blank of this alloy.
Embodiment 3ZAlSi7Mg alloy
The chemistry of alloy becomes: Si:6.91; Mg:0.32 all the other be: Al
The diameter that adopts the one-level cooling pipe is that 20 millimeters, length are 400 millimeters and carry out cold by force, the flow of cooling water is: 600 milliliters of per seconds, the diameter of secondary cooling pipe is that 35 millimeters, length are 350 millimeters and carry out cold by force, the flow of cooling water is: 400 milliliters of per seconds obtain the semi-solid-state shaping blank of this alloy.
Embodiment 43A21 alloy
The chemistry of alloy becomes: all the other are Al for Mn:1.3
The diameter that adopts the one-level cooling pipe is that 20 millimeters, length are 300 millimeters and carry out cold by force, the flow of cooling water is: 300 milliliters of per seconds, the diameter of secondary cooling pipe is that 30 millimeters, length are 200 millimeters and carry out cold by force, the flow of cooling water is: 60 milliliters of per seconds obtain the semi-solid-state shaping blank of this alloy.
Embodiment 52A20 alloy
The chemistry of alloy becomes: Cu:6.3; All the other are Al for Mg:0.1
The diameter that adopts the one-level cooling pipe is that 25 millimeters, length are 500 millimeters and carry out cold by force, the flow of cooling water is: 800 milliliters of per seconds, the diameter of secondary cooling pipe is that 35 millimeters, length are 350 millimeters and carry out cold by force, the flow of cooling water is: 300 milliliters of per seconds obtain the semi-solid-state shaping blank of this alloy.
Claims (1)
1. the technology of strong cold preparation semi-solid metal slurry of reducing classification or blank, it is characterized in that, the steel pipe that in the water-cooled overcoat, connects two kinds of different-diameters, use the metal liquid of the quick cooling of recirculated water of different flow by steel pipe respectively according to the different state of metal liquid, processing step is as follows:
(1) be 8～25mm with molten metal liquid in the tundish by diameter, it is cold by force that length is that the cooling pipe of 200～600mm carries out one-level;
(2) will enter into diameter after metal liquid after the one-level cooling is by connector is 16～35mm, and it is cold by force that length is that the cooling pipe of 200～600mm carries out secondary;
(3) with each second 5～2000 milliliters flow respectively the I and II steel pipe is applied cooling medium outward, strengthen cooling to the metal liquid in the steel pipe;
(4) according to the composition of metal liquid, the temperature of tundish liquid and the temperature in the connector, regulate the flow of I and II cooling medium respectively, make the temperature of the metal liquid in the connector reach above 5～15 degrees centigrade of this metal liquidus temperature, and the outlet temperature of secondary cooling pipe reaches following 1～15 degree centigrade of this alloy liquid phase line temperature, forms the slurry of semisolid moulding or the blank of formation semisolid moulding in mold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010199589 CN102274954B (en) | 2010-06-12 | 2010-06-12 | Process for preparing semisolid metal slurry or blank by reducing and grading strong cooling |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010199589 CN102274954B (en) | 2010-06-12 | 2010-06-12 | Process for preparing semisolid metal slurry or blank by reducing and grading strong cooling |
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| Publication Number | Publication Date |
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| CN102274954A CN102274954A (en) | 2011-12-14 |
| CN102274954B true CN102274954B (en) | 2013-07-31 |
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| CN 201010199589 Expired - Fee Related CN102274954B (en) | 2010-06-12 | 2010-06-12 | Process for preparing semisolid metal slurry or blank by reducing and grading strong cooling |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105817590B (en) * | 2016-06-17 | 2017-02-22 | 福建省金瑞高科有限公司 | Device for preparing semi-solid alloy slurry in full-automatic mode |
| CN112517873B (en) * | 2020-11-01 | 2022-04-12 | 广州德珐麒自动化技术有限公司 | Preparation process of semisolid aluminum alloy slurry |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3874438A (en) * | 1971-08-30 | 1975-04-01 | Bbc Brown Boveri & Cie | Apparatus for the continuous casting or drawing of an extrusion body through a coolant body |
| WO2004031423A3 (en) * | 2002-09-23 | 2004-07-01 | Worcester Polytech Inst | Method for making an alloy and alloy |
| CN1594617A (en) * | 2004-07-01 | 2005-03-16 | 北京科技大学 | Device for preparing semisolid metal and alloy pulp or blank |
| CN2688420Y (en) * | 2004-02-20 | 2005-03-30 | 北京有色金属研究总院 | Flat damp cooling pipe with flow bypass wedge |
| CN1657201A (en) * | 2004-02-20 | 2005-08-24 | 北京有色金属研究总院 | Method of preparing semisolid alloy slurry and its equipment |
| CN101011728A (en) * | 2007-01-29 | 2007-08-08 | 南昌大学 | Process for preparing semisolid metal or blank by multi-pipe dispersion intensive cooling |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08318349A (en) * | 1995-05-26 | 1996-12-03 | Ahresty Corp | Production of casting metallic billet and producing apparatus thereof |
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- 2010-06-12 CN CN 201010199589 patent/CN102274954B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3874438A (en) * | 1971-08-30 | 1975-04-01 | Bbc Brown Boveri & Cie | Apparatus for the continuous casting or drawing of an extrusion body through a coolant body |
| WO2004031423A3 (en) * | 2002-09-23 | 2004-07-01 | Worcester Polytech Inst | Method for making an alloy and alloy |
| CN2688420Y (en) * | 2004-02-20 | 2005-03-30 | 北京有色金属研究总院 | Flat damp cooling pipe with flow bypass wedge |
| CN1657201A (en) * | 2004-02-20 | 2005-08-24 | 北京有色金属研究总院 | Method of preparing semisolid alloy slurry and its equipment |
| CN1594617A (en) * | 2004-07-01 | 2005-03-16 | 北京科技大学 | Device for preparing semisolid metal and alloy pulp or blank |
| CN101011728A (en) * | 2007-01-29 | 2007-08-08 | 南昌大学 | Process for preparing semisolid metal or blank by multi-pipe dispersion intensive cooling |
Non-Patent Citations (1)
| Title |
|---|
| JP特开平8-318349A 1996.12.03 |
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