CN1132951C - Process for smelting and processing Mg-alloy particles used for thixotropic injection moulding - Google Patents
Process for smelting and processing Mg-alloy particles used for thixotropic injection moulding Download PDFInfo
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- CN1132951C CN1132951C CN 01135238 CN01135238A CN1132951C CN 1132951 C CN1132951 C CN 1132951C CN 01135238 CN01135238 CN 01135238 CN 01135238 A CN01135238 A CN 01135238A CN 1132951 C CN1132951 C CN 1132951C
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Abstract
The present invention relates to a method for smelting and processing magnesium alloy particles used for thixotropic injection moulding. By adopting the double refinement of a solid fluxing agent containing MgCl2, KCl, BaCl2 and CaF2, and argon, Al, Zn and an intermediate alloy are added according to the brand of a magnesium alloy to be smelted so as to control the chemical components of the magnesium alloy; a magnesium alloy bar is produced by adopting a low-voltage semi-continuous casting method under the protection of argon, the magnesium alloy bar is processed into magnesium alloy particles, and the processed magnesium alloy particles which are in irregular prismatic shapes are sieved and magnetically selected so as to obtain the finished products of the magnesium alloy particles; the particle size of the magnesium alloy particles is controlled by changing technological parameters of cutting output, feed and a chip-breaker groove. The present invention can obviously reduce the contents of Fe, Ni, Cl<-> and other impurities in magnesium alloys; the processed magnesium alloy particles have the advantages of uniform particle size, no oxide inclusion, approximately consistent shape, good fluidity and easy quantitative control, and can meet the requirements of a thixotropic injection moulding technology.
Description
(1) technical field
The invention belongs to the used for thixotropic injection moulding starting material--the melting and the working method of-Mg-alloy particles.
(2) background technology
Mg-alloy particles is to specialize in a kind of novel alloy material that the thixotropic injection moulding machine is produced magnesium-alloy material.Thixotropic forming also claims semi-solid-state shaping, and it is different from traditional working method, as casting, forging and other press working.It utilizes some alloy some special propertys under semi-solid state, produces the brand-new technology of a kind of " near-net forming " of high quality, high strength, high-precision part.The thixotropic injection moulding machine then with " local remelting " in the semi-solid-state shaping, two combine into one for " thixotropic forming " two procedures, in the system of totally-enclosed, applying argon gas protection, continuously supplies with Mg-alloy particles, produces the part of injection forming.At present, the U.S., Japan, Taiwan are being greatly developed with the thixotropic injection moulding machine and are being produced the high-tech electronic series products, as notebook computer, liquid crystal display, digital camera, pick up camera, mobile phone, personal data treatment system such as shells such as PDA, e-commerce.China is still belonging to blank aspect the research of Mg-alloy particles used for thixotropic injection moulding.Because the singularity of thixotropic injection moulding technology all has a series of particular requirements to Mg-alloy particles in chemical ingredients, face shaping, granularity or the like.
External at present employing resistance furnace melting semicontinuous casting, the magnesium alloy blank of casting is processed into by production miller chips.Chip globule size, differences in shape is bigger, and be mobile relatively poor in the thixotropic injection moulding course of processing, is difficult for quantitatively control.
Domestic employing crucible melting, No. 2 flux is concise, is cast as the magnesium alloy blank, then is milled into irregular sheet, and wherein foreign matter content is higher, does not reach the requirement of thixotropic injection moulding technology, only is used for deoxidation in steel making at present.
(3) summary of the invention
Technical problem to be solved by this invention is Fe, Ni, the Cl that can obviously reduce in fusion process in the magnesium alloy
-Content Deng impurity; The Mg-alloy particles of processing in pelletized form, good fluidity, easily quantitatively control can be satisfied the requirement of thixotropic injection moulding technology.
The present invention adopts flux and argon gas dual concise, and master alloy control magnesium alloy chemical composition is removed Fe, Ni impurity; Magnesium alloy rod is produced in low pressure semicontinuous casting under the argon shield; Be processed into Mg-alloy particles by magnesium alloy rod.Its melting technology is as follows:
1, will contain MgCl
242～48%, KCl 38～46%, BaCl
26～10%, CaF
23～7% solid fluxing agent adds in the crucible oven, and flux accounts for 3～10% of melting magnesium alloy weight, treats that flux fusing back adds the technical pure magnesium ingot, after the whole fusings of magnesium ingot, is warming up to 800～850 ℃; Stir flux and magnesium liquid, make its thorough mixing, churning time is 20～40 minutes;
2, according to the trade mark of institute's melting magnesium alloy, add Al, Zn and master alloy control magnesium alloy chemical composition, the charging basket that 100～150 ℃ Al-Ti5 or Mg-Mn4 and Al-Mn4 master alloy place the titanium rod to be welded into will be preheated to, slowly immerse in the above-mentioned magnesium liquid, constantly stir, make its fusing; Add the weight of master alloy, account for 0.3～1.5% of institute's melting magnesium alloy total amount;
3, liquation left standstill in airtight crucible 20～40 minutes, under argon shield, imposed the pressure of 0.05Mpa on the metal bath surface, made liquid magnesium alloy by being arranged on the thrust-augmenting nozzle of crucible bottom, was pressed into the stove that leaves standstill of argon shield;
4, be the argon gas feeding liquid magnesium alloy bottom of 0.01Mpa with pressure, constantly stir that churning time is 5～15 minutes;
5, liquid magnesium alloy is left standstill 20～40 minutes; under argon shield; liquid magnesium alloy after will leaving standstill with the pressure of 0.05Mpa is by leaving standstill the splitter of furnace pressure to the crystallizer top; import crystallizer by splitter again; then cast excellent ingot, 680～720 ℃ of pouring temperatures, ingot casting speed 30～33mm/sec by semicontinuous casting machine; 15～20 ℃ of crystallizer coolant water temperatures, hydraulic pressure 0.06～0.08Mpa.
Above-mentioned magnesium alloy bar ingot need be processed into Mg-alloy particles according to the thixotropic injection moulding processing requirement, and therefore the shape of Mg-alloy particles to thixotropic forming technology important influence subsequently, must guarantee that the shape and the granularity of Mg-alloy particles are qualified.The present invention adopts the special granulating machine tooling, and its granulating process is as follows:
Earlier excellent ingot epidermis car is removed 5～10mm, be contained in then on the special granulating lathe and process, machined parameters is designed to: cutting speed 100～180m/min, cutting output 1.8～2.8mm, the amount of feed 2～6mm; The processing of employing inserted tool, tool orthogonal rake chip breaker R is 1.5～3.5mm.Control the granularity of Mg-alloy particles by the processing parameter that changes cutting output, the amount of feed and chip breaker.
The Mg-alloy particles that processes is irregular rib shape body, the content F e:0.0025 of impurity～0.0019%, Ni:0.0011～0.0005%, Cl in the finished product
-: 0.002～0.0008%, be the Mg-alloy particles finished product through screening, magnetic separation.
The present invention adopts flux and the dual concise method of argon gas, belongs to the first at home in the magnesium alloy smelting, and the argon gas refining can be removed gas and the chlorion in the molten metal; By master alloy control magnesium alloy chemical composition, foreign matter content such as Fe, Ni just directly has influence on the corrosion resistance of magnesium alloy in the magnesium alloy, adds master alloy and can control alloying constituent very accurately; The granularity of the processing parameter control Mg-alloy particles by changing cutting output, the amount of feed and chip breaker, the Mg-alloy particles of processing, epigranular, non-oxidation is mingled with, and shape is unanimous on the whole, is easy to quantitative control, can satisfy the requirement of thixotropic injection moulding process fully.
China does not also adopt the thixotropic injection shaper to produce magnesium-alloy material at present, and the Mg-alloy particles that the present invention produces according to above-mentioned technical process is on probation in U.S. a company, and effect is very good, and suitable fully thixotropic injection shaper uses.
(4) embodiment
Embodiment 1
Produce 3 * 3 * 3mm Mg-alloy particles of the AZ91D trade mark, require the chemical ingredients such as the following table of magnesium alloy:
| Al | Zn | Mn | Si | Fe | Ni | Mg |
| 8.5-9.5 | 0.45-0.90 | 0.17-0.40 | 0.05 | 0.004 | 0.001 | Surplus |
To contain MgCl according to above-mentioned melting technology
245%, KCl 42%, BaCl
28%, CaF
25% solid fluxing agent adds in the crucible oven, and flux accounts for 5% of melting magnesium alloy weight, treats that flux fusing back adds the technical pure magnesium ingot, after the whole fusings of magnesium ingot, is warming up to 800～820 ℃; Stir flux and magnesium liquid, make its thorough mixing, churning time is 30 minutes.
When Fe＞0.03 in the raw material magnesium, Ni＞0.02, need to add the Al-Ti5 master alloy with control magnesium alloy chemical composition, remove Fe, Ni impurity, wherein Al is 95%, Ti is 5%, master alloy accounts for the 0.5-1% of magnesium alloy total amount; When Fe＞0.05 in the raw material magnesium, Ni＞0.02, need equivalent to add Al-Ti5, Mg-Mn4, Al is 95%, Ti is 5%, Mg is 96%, Mn is 4%, master alloy accounts for the 0.7-1.2% of magnesium alloy total amount, adds the Mg-Mn4 master alloy and can play the content of removing Mn in Fe impurity and the control magnesium alloy.
Magnesium alloy liquation method as previously mentioned left standstill in airtight crucible 20～40 minutes, under argon shield, imposed the pressure of 0.05Mpa on the metal bath surface, made liquid magnesium alloy by being arranged on the thrust-augmenting nozzle of crucible bottom, was pressed into the stove that leaves standstill of argon shield; With pressure is the argon gas feeding liquid magnesium alloy bottom of 0.01Mpa, constantly stirs, and churning time is 5～15 minutes; Liquid magnesium alloy was left standstill 20～40 minutes; under argon shield; liquid magnesium alloy after will leaving standstill with the pressure of 0.05Mpa is by leaving standstill the splitter of furnace pressure to the crystallizer top; import crystallizer by splitter again, then cast excellent ingot, 680～720 ℃ of pouring temperatures by semicontinuous casting machine; ingot casting speed 30～33mm/sec; 15～20 ℃ of crystallizer coolant water temperatures, hydraulic pressure 0.06～0.08Mpa crystallizes into the magnesium alloy bar ingot of diameter 200mm.
Above-mentioned magnesium alloy bar ingot becomes Mg-alloy particles by the special granulating machine tooling, and its granulating process is as follows:
Earlier excellent ingot epidermis car is removed 5～10mm, be contained in then on the special granulating lathe and process, machined parameters is designed to: cutting speed 120m/min, cutting output 2.4mm, amount of feed 2mm; The processing of employing inserted tool, tool orthogonal rake chip breaker R is 2.5mm.The Mg-alloy particles that processes is the Mg-alloy particles finished product through screening, magnetic separation.
The finished product Mg-alloy particles is through chemical examination Fe, Ni, Cl
-Content is as follows:
Fe：0.0025～0.0019；Ni：0.0011～0.0005；Cl
-：0.002～0.0008％。
Above data the AZ91D trade mark that is provided by American side are provided require the technical indicator content that reaches, and outlet U.S. quality gets the nod.
Embodiment 2
Produce 2 * 2 * 4mm Mg-alloy particles of the AM60B trade mark, require the chemical ingredients such as the following table of magnesium alloy:
| Al | Zn | Mn | Si | Fe | Ni | Mg |
| 5.6-6.4 | 0.20 | 0.26-0.50 | 0.05 | 0.004 | 0.001 | Surplus |
To contain MgCl according to above-mentioned melting technology
246%, KCl 43%, BaCl
27%, CaF
24% solid fluxing agent adds in the crucible oven, and flux accounts for 8% of melting magnesium alloy weight, treats that flux fusing back adds the technical pure magnesium ingot, after the whole fusings of magnesium ingot, is warming up to 800～820 ℃; Stir flux and magnesium liquid, make its thorough mixing, churning time is 30 minutes.
When Fe＞0.03 in the raw material magnesium, Ni＞0.02, need to add the Al-Ti5 master alloy with control magnesium alloy chemical composition, remove Fe, Ni impurity, wherein Al is 95%, Ti is 5%, master alloy accounts for the 0.8-1.2% of magnesium alloy total amount; When Fe＞0.05 in the raw material magnesium, Ni＞0.02, need equivalent to add Al-Ti5, Mg-Mn4, wherein Al is 95%, Ti is 5%, Mg is 96%, Mn is 4%, master alloy accounts for the 1.2-1.5% of magnesium alloy total amount, adds the Mg-Mn4 master alloy and can play the content of removing Mn in Fe impurity and the control magnesium alloy.
Magnesium alloy liquation method as previously mentioned left standstill in airtight crucible 20～40 minutes, under argon shield, imposed the pressure of 0.05Mpa on the metal bath surface, made liquid magnesium alloy by being arranged on the thrust-augmenting nozzle of crucible bottom, was pressed into the stove that leaves standstill of argon shield; With pressure is the argon gas feeding liquid magnesium alloy bottom of 0.01Mpa, constantly stirs, and churning time is 5～15 minutes; Liquid magnesium alloy was left standstill 20～40 minutes; under argon shield; liquid magnesium alloy after will leaving standstill with the pressure of 0.05Mpa is by leaving standstill the splitter of furnace pressure to the crystallizer top; import crystallizer by splitter again, then cast excellent ingot, 680～720 ℃ of pouring temperatures by semicontinuous casting machine; ingot casting speed 30～33mm/sec; 15～20 ℃ of crystallizer coolant water temperatures, hydraulic pressure 0.06～0.08Mpa crystallizes into the magnesium alloy bar ingot of diameter 200mm.
Above-mentioned magnesium alloy bar ingot becomes Mg-alloy particles by the special granulating machine tooling, and its granulating process is as follows:
Earlier excellent ingot epidermis car is removed 5～10mm, be contained in then on the special granulating lathe and process, machined parameters is designed to: cutting speed 180m/min, cutting output 1.8mm, amount of feed 4mm; The processing of employing inserted tool, tool orthogonal rake chip breaker R is 2.0mm.The Mg-alloy particles that processes is the Mg-alloy particles finished product through screening, magnetic separation.
The finished product Mg-alloy particles is through chemical examination Fe, Ni, Cl
-Content is as follows:
Fe：0.0025～0.0019；Ni：0.0011～0.0005；Cl
-：0.002～0.0008％。
Above data the AM60B trade mark that is provided by American side are provided require the technical indicator content that reaches, and outlet U.S. quality gets the nod.
Claims (1)
1, a kind of melting of Mg-alloy particles used for thixotropic injection moulding and working method is characterized in that adopting flux and argon gas dual concise, and master alloy control magnesium alloy chemical composition is removed Fe, Ni impurity; Magnesium alloy rod is produced in low pressure semicontinuous casting under the argon shield; Be processed into Mg-alloy particles by magnesium alloy rod; Its melting technology is as follows:
(1) will contain MgCl
242～48%, KCl 38～46%, BaCl
26～10%, CaF
23～7% solid fluxing agent adds in the crucible oven, and flux accounts for 3～10% of melting magnesium alloy weight, treats that flux fusing back adds the technical pure magnesium ingot, after the whole fusings of magnesium ingot, is warming up to 800～850 ℃; Stir flux and magnesium liquid, make its thorough mixing, churning time is 20～40 minutes;
(2) according to the trade mark of institute's melting magnesium alloy, add Al, Zn and master alloy control magnesium alloy chemical composition, the charging basket that 100～150 ℃ Al-Ti5 or Mg-Mn4 and Al-Mn4 master alloy place the titanium rod to be welded into will be preheated to, slowly immerse in the above-mentioned magnesium liquid, constantly stir, make its fusing; Add the weight of master alloy, account for 0.3～1.5% of institute's melting magnesium alloy total amount;
(3) liquation left standstill in airtight crucible 20～40 minutes, under argon shield, imposed the pressure of 0.05Mpa on the metal bath surface, made liquid magnesium alloy by being arranged on the thrust-augmenting nozzle of crucible bottom, was pressed into the stove that leaves standstill of argon shield;
(4) be the argon gas feeding liquid magnesium alloy bottom of 0.01Mpa with pressure, constantly stir that churning time is 5～15 minutes;
(5) liquid magnesium alloy is left standstill 20～40 minutes, under argon shield, liquid magnesium alloy after will leaving standstill with the pressure of 0.05Mpa is by leaving standstill the splitter of furnace pressure to the crystallizer top, import crystallizer by splitter again, then cast excellent ingot, 680 ℃～720 ℃ of pouring temperatures, ingot casting speed 30～33mm/sec by semicontinuous casting machine, 15 ℃～20 ℃ of crystallizer coolant water temperatures, hydraulic pressure 0.06～0.08Mpa;
Above-mentioned magnesium alloy bar ingot is processed into Mg-alloy particles according to the thixotropic injection moulding processing requirement, its granulating process is as follows: earlier excellent ingot epidermis car is removed 5～10mm, be contained in then on the special granulating lathe and process, machined parameters is designed to: cutting speed 100～180m/min, cutting output 1.8～2.8mm, the amount of feed 2～6mm; The processing of employing inserted tool, tool orthogonal rake chip breaker R is 1.5～3.5mm; Control the granularity of Mg-alloy particles by the processing parameter that changes cutting output, the amount of feed and chip breaker;
The Mg-alloy particles that processes is irregular rib shape body, foreign matter content Fe:0.0025～0.0019%, Ni:0.0011～0.0005%, Cl in the finished product
-: 0.002～0.0008%, be the Mg-alloy particles finished product through screening, magnetic separation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01135238 CN1132951C (en) | 2001-12-11 | 2001-12-11 | Process for smelting and processing Mg-alloy particles used for thixotropic injection moulding |
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|---|---|---|---|
| CN 01135238 CN1132951C (en) | 2001-12-11 | 2001-12-11 | Process for smelting and processing Mg-alloy particles used for thixotropic injection moulding |
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| CN1132951C true CN1132951C (en) | 2003-12-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100363145C (en) * | 2005-05-20 | 2008-01-23 | 东北轻合金有限责任公司 | Method for manufacturing extruded bar from magnesium alloy |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006124795A (en) * | 2004-10-29 | 2006-05-18 | National Institute Of Advanced Industrial & Technology | Housing made from magnesium alloy |
| KR101310622B1 (en) * | 2011-04-08 | 2013-09-24 | 가부시키가이샤 에스티유 | Magnesium alloy chips and process for manufacturing molded article using same |
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2001
- 2001-12-11 CN CN 01135238 patent/CN1132951C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100363145C (en) * | 2005-05-20 | 2008-01-23 | 东北轻合金有限责任公司 | Method for manufacturing extruded bar from magnesium alloy |
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