CN102756113A - Casting method of semi-solid state aluminum alloy cast rod for extrusion molding - Google Patents
Casting method of semi-solid state aluminum alloy cast rod for extrusion molding Download PDFInfo
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- CN102756113A CN102756113A CN2012102635611A CN201210263561A CN102756113A CN 102756113 A CN102756113 A CN 102756113A CN 2012102635611 A CN2012102635611 A CN 2012102635611A CN 201210263561 A CN201210263561 A CN 201210263561A CN 102756113 A CN102756113 A CN 102756113A
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Abstract
The invention discloses a casting method of a semi-solid state aluminum alloy cast rod for extrusion molding. According to the casting method, alternating current is applied to a solid-liquid coexisting region of metal in a metal solidification process, and the metal is electromagnetically stirred, so that dentritic crystal can be effectively broken to form a spherical micro-particle structure in a matrix; meanwhile, a liquid cavity can be shoaled by violent stirring; the temperature distribution is more uniform; the quality and the mechanical property of the cast rod are effectively improved; and the casting method has the advantages of stable filling, no turbulent flow or splash, low temperature, less latent heat of crystallization, short solidification time, high production efficiency and suitability for wide use in the industry.
Description
Technical field
The invention belongs to technical field of nonferrous metal processing, be specifically related to a kind of casting method that is used for the semi-solid aluminium alloy casting rod of extrusion molding.
Background technology
In the casting process of traditional semi-solid aluminium alloy casting rod, usually can have following problem because of the defective of technology: the liquid cave is dark, and temperature distributing disproportionation is even, and the casting rod is easy to crack and surface quality is poor; Crystal grain is thick, influences material mechanical performance; The skeleton that exists a large amount of dendritic crystals to form, material flowability is poor, shortcomings such as follow-up processing and forming difficulty, increased greatly produce and processing in the waste of raw material and the energy, it is very important therefore inventing a kind of novel forging type.
Summary of the invention
The purpose of invention: the invention solves the problem that prior art exists, the casting method of the semi-solid aluminium alloy casting rod that is used for extrusion molding that a kind of mechanical property is good, working (machining) efficiency is high is provided.
Technical scheme: for achieving the above object, the present invention adopts following technical scheme:
A kind of casting method that is used for the semi-solid aluminium alloy casting rod of extrusion molding, said aluminium alloy casting rod is following in shape casting explained hereafter step:
(1) with the fusing of the alloy material of aluminium and interpolation thereof, and the control temperature of aluminum liquid begins casting between 740-780 ℃, and opens cooling water;
(2) in casting process, control its cast temperature through control aluminium liquid at the height of mould, cast temperature is 680-700 ℃, and control mould head and tail temperature difference is no more than 20 ℃;
(3) after aluminium liquid is full of mould, open electromagnetic mixing apparatus, casting starting stage electric current is 0-20A, casting speed 40-80mm/min, cooling water flow are 2800-3000L/min;
(4) when casting length reaches 400-800mm, to improve the electromagnetic agitation electric current and increase casting speed, this moment, electric current was 60-80A, and casting speed reaches 100-150mm/min, and cooling water flow is 3200-3500L/min;
(5) when casting length reaches 6500-7000mm, begin the casting speed that slows down, and reduce the electromagnetic agitation electric current, casting speed slowly is reduced to 0mm/min by maximum, and it is zero that electric current also decreases, and cooling water flow is constant, and casting finishes.
In metal solidification process, apply alternating current through solid-liquid coexistence to metal, it is carried out electromagnetic agitation, can effectively smash dendritic crystal, make to form the spheroidal particle structure in the matrix; Violent stirring simultaneously can make the liquid cave shoal, and Temperature Distribution is more even, effectively improves excellent quality of casting and mechanical property.
Beneficial effect: the present invention fill type steadily, no turbulent flow and splash, temperature is low, crystallization latent heat is few, setting time is short, thereby has alleviated the thermal shock to shaped device, and the production efficiency height; Solidification shrinkage is little, and that interior tissue is knitted is close, crystal grain is tiny evenly be suitable for newly net forming, and surface of shaped parts is smooth smooth, and dimensional accuracy is high, and mechanical property is good; Energy savings is an example with production unit quality part, and semi-solid processing compares energy-conservation about 35% with the common aluminum alloy casting.
The specific embodiment
Embodiment 1:
A kind of casting method that is used for the semi-solid aluminium alloy casting rod of extrusion molding, aluminium alloy casting rod is following in shape casting explained hereafter step:
(1) with the fusing of the alloy material of aluminium and interpolation thereof, and the control temperature of aluminum liquid begins casting between 740 ℃, and opens cooling water;
(2) in casting process, control its cast temperature through control aluminium liquid at the height of mould, cast temperature is 680 ℃, and control mould head and tail temperature difference is no more than 20 ℃;
(3) after aluminium liquid is full of mould, open electromagnetic mixing apparatus, casting starting stage electric current is 0A, casting speed 40mm/min, cooling water flow are 2800L/min;
(4) when casting length reaches 400mm, to improve the electromagnetic agitation electric current and increase casting speed, this moment, electric current was 60A, and casting speed reaches 100mm/min, and cooling water flow is 3200L/min;
(5) when casting length reaches 6500mm, begin the casting speed that slows down, and reduce the electromagnetic agitation electric current, casting speed slowly is reduced to 0mm/min by maximum, and it is zero that electric current also decreases, and cooling water flow is constant, and casting finishes.
Embodiment 2:
A kind of casting method that is used for the semi-solid aluminium alloy casting rod of extrusion molding, aluminium alloy casting rod is following in shape casting explained hereafter step:
(1) with the fusing of the alloy material of aluminium and interpolation thereof, and the control temperature of aluminum liquid begins casting between 760 ℃, and opens cooling water;
(2) in casting process, control its cast temperature through control aluminium liquid at the height of mould, cast temperature is 690 ℃, and control mould head and tail temperature difference is no more than 20 ℃;
(3) after aluminium liquid is full of mould, open electromagnetic mixing apparatus, casting starting stage electric current is 10A, casting speed 60mm/min, cooling water flow are 2800-3000L/min;
(4) when casting length reaches 600mm, to improve the electromagnetic agitation electric current and increase casting speed, this moment, electric current was 70A, and casting speed reaches 125mm/min, and cooling water flow is 3350L/min;
(5) when casting length reaches 6750mm, begin the casting speed that slows down, and reduce the electromagnetic agitation electric current, casting speed slowly is reduced to 0mm/min by maximum, and it is zero that electric current also decreases, and cooling water flow is constant, and casting finishes.
Embodiment 3:
A kind of casting method that is used for the semi-solid aluminium alloy casting rod of extrusion molding, said aluminium alloy casting rod is following in shape casting explained hereafter step:
(1) with the fusing of the alloy material of aluminium and interpolation thereof, and the control temperature of aluminum liquid begins casting between 780 ℃, and opens cooling water;
(2) in casting process, control its cast temperature through control aluminium liquid at the height of mould, cast temperature is 700 ℃, and control mould head and tail temperature difference is no more than 20 ℃;
(3) after aluminium liquid is full of mould, open electromagnetic mixing apparatus, casting starting stage electric current is 20A, casting speed 80mm/min, cooling water flow are 3000L/min;
(4) when casting length reaches 800mm, to improve the electromagnetic agitation electric current and increase casting speed, this moment, electric current was 80A, and casting speed reaches 150mm/min, and cooling water flow is 3500L/min;
(5) when casting length reaches 7000mm, begin the casting speed that slows down, and reduce the electromagnetic agitation electric current, casting speed slowly is reduced to 0mm/min by maximum, and it is zero that electric current also decreases, and cooling water flow is constant, and casting finishes.
Claims (1)
1. a semi-solid aluminium alloy that is used for extrusion molding is cast excellent casting method, it is characterized in that: said aluminium alloy casting rod is following in shape casting explained hereafter step:
(1) with the fusing of the alloy material of aluminium and interpolation thereof, and the control temperature of aluminum liquid begins casting between 740-780 ℃, and opens cooling water;
(2) in casting process, control its cast temperature through control aluminium liquid at the height of mould, cast temperature is 680-700 ℃, and control mould head and tail temperature difference is no more than 20 ℃;
(3) after aluminium liquid is full of mould, open electromagnetic mixing apparatus, casting starting stage electric current is 0-20A, casting speed 40-80mm/min, cooling water flow are 2800-3000L/min;
(4) when casting length reaches 400-800mm, to improve the electromagnetic agitation electric current and increase casting speed, this moment, electric current was 60-80A, and casting speed reaches 100-150mm/min, and cooling water flow is 3200-3500L/min;
(5) when casting length reaches 6500-7000mm, begin the casting speed that slows down, and reduce the electromagnetic agitation electric current, casting speed slowly is reduced to 0mm/min by maximum, and it is zero that electric current also decreases, and cooling water flow is constant, and casting finishes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102635611A CN102756113A (en) | 2012-07-28 | 2012-07-28 | Casting method of semi-solid state aluminum alloy cast rod for extrusion molding |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012102635611A CN102756113A (en) | 2012-07-28 | 2012-07-28 | Casting method of semi-solid state aluminum alloy cast rod for extrusion molding |
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| CN102756113A true CN102756113A (en) | 2012-10-31 |
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| CN2012102635611A Pending CN102756113A (en) | 2012-07-28 | 2012-07-28 | Casting method of semi-solid state aluminum alloy cast rod for extrusion molding |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1249970A (en) * | 1999-09-22 | 2000-04-12 | 河北科技大学 | Manufacture of wear resisting product |
| CN1651167A (en) * | 2004-02-04 | 2005-08-10 | 洪俊杓 | Rheoforming apparatus |
| CN1242079C (en) * | 2002-09-25 | 2006-02-15 | 洪俊杓 | Metallic materials for rheocasting or thixoforming and method for manufacturing the same |
| CN1298461C (en) * | 2002-09-25 | 2007-02-07 | 洪俊杓 | Die casting method and apparatus for rheocasting |
| JP4247536B2 (en) * | 2003-11-20 | 2009-04-02 | 宇部興産機械株式会社 | Manufacturing method of high strength aluminum alloy products |
-
2012
- 2012-07-28 CN CN2012102635611A patent/CN102756113A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1249970A (en) * | 1999-09-22 | 2000-04-12 | 河北科技大学 | Manufacture of wear resisting product |
| CN1242079C (en) * | 2002-09-25 | 2006-02-15 | 洪俊杓 | Metallic materials for rheocasting or thixoforming and method for manufacturing the same |
| CN1298461C (en) * | 2002-09-25 | 2007-02-07 | 洪俊杓 | Die casting method and apparatus for rheocasting |
| JP4247536B2 (en) * | 2003-11-20 | 2009-04-02 | 宇部興産機械株式会社 | Manufacturing method of high strength aluminum alloy products |
| CN1651167A (en) * | 2004-02-04 | 2005-08-10 | 洪俊杓 | Rheoforming apparatus |
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Application publication date: 20121031 |