CN106513629A - Improved AZ31 magnesium alloy hub extrusion casting technology - Google Patents
Improved AZ31 magnesium alloy hub extrusion casting technology Download PDFInfo
- Publication number
- CN106513629A CN106513629A CN201610989658.9A CN201610989658A CN106513629A CN 106513629 A CN106513629 A CN 106513629A CN 201610989658 A CN201610989658 A CN 201610989658A CN 106513629 A CN106513629 A CN 106513629A
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- magnesium alloy
- hub
- mpa
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- extrusion casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/02—Pressure casting making use of mechanical pressure devices, e.g. cast-forging
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
- C22C23/02—Alloys based on magnesium with aluminium as the next major constituent
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention discloses an improved AZ31 magnesium alloy hub extrusion casting technology. A magnesium alloy adopted in the technology comprises, by weight percent, 2.5%-3.5% of Al, 0.08% of Si, 0.04% of Ca, 0.6%-1.4% of Zn, 0.2%-1.0% of Mn, 0.003% of Fe, 0.01% of Cu, 0.001% of Ni, 0.2%-0.4% of Ti and the balance Mg. The casting temperature of the technology ranges from 670 DEG C to 690 DEG C, the die preheating temperature ranges from 240 DEG C to 260 DEG C, the punch injection speed ranges from 0.14 m/s to 0.16 m/s, the extrusion casting pressure ranges from 60 MPa to 100 MPa, the pressurizing time ranges from 50 ms to 100 ms, and the holding pressure ranges from 75 MPa to 85 MPa. A hub is composed of the magnesium alloy composed of specific components, the specific technology conditions are selected, the magnesium alloy hub obtained through extrusion casting is small in weight and large in strength, and the service performance of the hub is achieved. The tensile strength of the obtained magnesium alloy hub exceeds 340 MPa and is far larger than that of an AZ31 alloy with the tensile strength being 290 MPa, the grain size is reduced to 6-10 microns from 8-15 microns of the AZ31 magnesium alloy, and the performance of the magnesium alloy hub is greatly improved.
Description
Technical field
The present invention relates to casting technology field, more particularly to a kind of magnesium alloy hub Extrution casting technique.
Background technology
At present, the energy-saving world's vapour that has become rubs the main flow of development.For this purpose, golden, compound using magnesium platform on automobile
Material etc. is modern high to be mitigated vapour than performance materials and rubs the weight of structure, particularly high-speed moving part, and oneself becomes and improves automobile and move
The main material means of power performance and exhaust emission.Magnesium alloy possesses low price, height and subtracts than performance, the resisting fatigue of protrusion and damping
Shake anti-acoustic capability, is particularly suitable for making the boss material of car, light-duty vehicle, motorcycle.
China is the big country that motorcycle produces, uses and export, and is also becoming automobile production, is using big country.My field magnesium
Aboundresources, it is big tired to have become the production of former magnesium, but in default of magnesium platform gold production application technology, now the 80% of domestic former magnesium
As inexpensive raw material mountain pass.Gradually (each vapour that wheel hub is automobile, single casting weight is maximum on motorcycle, consumption is most
Car needs 5 wheel hubs, weight to reach 20-30kg, and each motorcycle needs two wheel hubs, weight to reach 4-8 kilogram).Such as domestic automobile,
Sizable application magnesium alloy on motorcycle, annual magnesium alloy demand are up to more than 150,000 tons, can reach 11.4 per annual value of production
Hundred million RMB or so.Therefore, existing aluminium alloy is substituted with magnesium alloy, produce satisfactory magnesium alloy hub, with weight
Big economic interests.
Cast magnesium alloy AZ31, with higher vibration resistance and heat absorption capacity, thus is the ideal for manufacturing aircraft wheel hub
Material.Magnesium alloy AZ31 is very stable in gasoline, kerosene and lubricating oil, is suitable to manufacture engine gear casing, oil pump and oil pipe,
It is used to manufacture rocking arm, the movable members such as hatch door and rudder face because the inertia force produced in rotation and reciprocating motion is less again.
Civil aircraft and military aircraft, especially bomber widely use magnesium alloy product.
At present, application of the AZ31 magnesium alloys on automobile is also very extensive.Such as clutch housing, valve gap, gearbox body cylinder
Lid, air conditioner shell etc..Steering wheel, turning rack, braking bracket etc..Impulsive force is absorbed in order to improve after automobile is clashed into
And lightweight, magnesium alloy is used on steering wheel and seat.According to relevant research, what automobile was fuel used 60% is consumed in vapour
Car is conducted oneself with dignity, and automotive dead weight often mitigates 10%, and its fuel efficiency can improve more than 5%；Automotive dead weight often reduces 100kg, public per hundred
In oil consumption can reduce 0.7L or so, often save 1L fuel can reduce CO2Discharge 2.5g, annual emissions reduce more than 30%.So
Mitigation impact of the vehicle weight to environment and the energy is very big, the light weight chemical conversion inexorable trend of automobile.
But existing aluminium alloy wheel hub production technology, due to aluminium alloy capability it is entirely different with Properties of Magnesium Alloy, the two nothing
Method is replaced and is used, therefore the casting technique of exploitation magnesium alloy hub is very necessary.
The content of the invention
It is an object of the invention to propose a kind of improvement AZ31 magnesium alloy hub Extrution casting techniques, disclosure satisfy that wheel hub takes
Labour performance.
It is that, up to this purpose, the present invention is employed the following technical solutions：
A kind of improvement AZ31 magnesium alloy hub Extrution casting techniques, the magnesium alloy which adopts are constituted such as by weight percentage
Under, Al 2.5-3.5%, Si 0.08%, Ca 0.04%, Zn 0.6-1.4%, Mn 0.2-1.0%, Fe0.003%, Cu
0.01%, Ni 0.001%, Ti 0.2-0.4%, Mg surpluses；
In its casting technique, pouring temperature is 670 DEG C -690 DEG C, and mold preheating temperature is 240 DEG C -260 DEG C, drift injection
Speed 0.14-0.16m/s, extrusion casint pressure are 60-100MPa, and pressing time is 50ms-100ms, and dwell pressure is 75-
85MPa。
The present invention adopts magnesium alloy, and which adds appropriate Ti on the basis of AZ31 magnesium alloys.In the present invention, Ti is used
Carry out crystal grain thinning, improve the mechanical property and plasticity of alloy.But Ti contents can not be too big, and otherwise unnecessary Ti can generate free state
TiAl3, after aggregation, cause the mechanical properties decrease of material.
The height of mold temperature, directly influences the life-span of casting quality and casting mold.Mold preheating temperature is too low, cast
Aluminium alloy can be solidified after injection die cavity quickly, just form thicker crystallization duricrust, affect pressure effect before pressurization.Additionally,
Due also in metal thermograde increase so that foundry goods forms big column crystal, increases the defects such as cold shut.Mold preheating temperature
Height, can increase the thermal stress of casting mold, cause metal bonding with mold cavity surface, reduce mould life, while the demoulding can be brought difficult.
Therefore the characteristics of present invention is for magnesium alloy, sets mold preheating temperature as 240 DEG C -260 DEG C, preferably 250 DEG C.
Alloy pouring temperature has appreciable impact to metal forming.Alloy pouring temperature in extrusion casint should be reasonable
In the range of, low value is taken as far as possible.Because during using cast cold, the thermograde in alloy is relatively small, the gas of generation
The scale of construction is less, and foundry goods contraction is may be reduced by casting solidification, the defects such as shrinkage cavity and porosity are reduced.Meanwhile, relatively low temperature can be carried
High mould life, reduces splash and the fash of liquid metal, and crystal grain thinning tissue is beneficial to improving for casting quality certainly,
As extrusion casint is to solidify under high pressure, so have ready conditions realizing cast cold.But if pouring temperature is too low, now alloy pole
Easily solidify, cause casting to be not fully filled.If temperature is too high, shrinkage cavity is easily produced, die life is also affected.
The present invention is based on above-mentioned consideration, selects pouring temperature to be 670 DEG C -690 DEG C, preferably 680 DEG C.
The present invention selects the composition of the magnesium alloy of specific composition, selects specific process conditions, the magnesium that extrusion casint is obtained
Alloy wheel hub is lightweight, powerful degree, meets the military service performance of wheel hub.Resulting magnesium alloy hub, its tensile strength exceed
340MPa, is far longer than the 290MPa of AZ31 alloys, and grain size also drops to 6-10 μm by 8-15 μm of AZ31 magnesium alloys, significantly
Improve the performance of magnesium alloy hub.
Specific embodiment
Technical scheme is further illustrated below by specific embodiment.
Embodiment 1
A kind of magnesium alloy hub Extrution casting technique, the magnesium alloy which adopts constitute as follows by weight percentage, Al 2.5-
3.5%, Si 0.08%, Ca 0.04%, Zn 0.6-1.4%, Mn 0.2-1.0%, Fe 0.003%, Cu0.01%, Ni
0.001%, Ti 0.2%, Mg surplus；；
Its pouring temperature is 680 DEG C, and mold preheating temperature is 250 DEG C, drift injection speed 0.14m/s, extrusion casint pressure
Power is 60MPa, and pressing time is 50msms, and dwell pressure is 75MPa.
Embodiment 2
A kind of magnesium alloy hub Extrution casting technique, the magnesium alloy which adopts constitute as follows by weight percentage, Al 2.5-
3.5%, Si 0.08%, Ca 0.04%, Zn 0.6-1.4%, Mn 0.2-1.0%, Fe 0.003%, Cu0.01%, Ni
0.001%, Ti 0.4%, Mg surplus；
Its pouring temperature is 670 DEG C, and mold preheating temperature is 240 DEG C DEG C, drift injection speed 0.16m/s, extrusion casint
Pressure is 100MPa, and pressing time is 100ms, and dwell pressure is 85MPa.
Jing embodiments 1-2 verify that resulting magnesium alloy hub, its tensile strength are far longer than AZ31 more than 340MPa
The 290MPa of alloy, grain size also drop to 6-10 μm by 8-15 μm of AZ31 magnesium alloys, greatly improve magnesium alloy hub
Performance.
Which fills, and type flow stream velocity is uniform, and filling mould states are good, completes to fill the casting temperature after type and is evenly distributed, and foundry goods coagulates
Gu it is steady rapid, solidification is completed according to the order of design.Internal Quality of Cast is good, no significant defect.
Claims (1)
1. a kind of to improve AZ31 magnesium alloy hub Extrution casting techniques, the magnesium alloy which adopts constitutes as follows by weight percentage,
Al 2.5-3.5%, Si 0.08%, Ca 0.04%, Zn 0.6-1.4%, Mn 0.2-1.0%, Fe 0.003%, Cu
0.01%, Ni 0.001%, Ti 0.2-0.4%, Mg surpluses；
In its casting technique, pouring temperature is 670 DEG C -690 DEG C, and mold preheating temperature is 240 DEG C -260 DEG C, drift injection speed
0.14-0.16m/s, extrusion casint pressure are 60-100MPa, and pressing time is 50ms-100ms, and dwell pressure is 75-85MPa.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610989658.9A CN106513629A (en) | 2016-11-10 | 2016-11-10 | Improved AZ31 magnesium alloy hub extrusion casting technology |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610989658.9A CN106513629A (en) | 2016-11-10 | 2016-11-10 | Improved AZ31 magnesium alloy hub extrusion casting technology |
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| CN106513629A true CN106513629A (en) | 2017-03-22 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1507970A (en) * | 2002-12-16 | 2004-06-30 | 威海万丰镁业科技发展有限公司 | Magnesium alloy hub pressure casting apparatus and method thereof |
| JP2012126960A (en) * | 2010-12-15 | 2012-07-05 | Isuzu Motors Ltd | Aluminum composite material and method for producing the same |
| JP2013076145A (en) * | 2011-09-30 | 2013-04-25 | Taiheiyo Cement Corp | Method for manufacturing composite material sheet |
| CN103203602A (en) * | 2013-04-15 | 2013-07-17 | 中国兵器工业第五二研究所 | Production method of magnesium alloy hub |
| CN103255329A (en) * | 2013-05-07 | 2013-08-21 | 宝山钢铁股份有限公司 | Low-cost fine-grain weak-texture magnesium alloy sheet and manufacturing method thereof |
-
2016
- 2016-11-10 CN CN201610989658.9A patent/CN106513629A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1507970A (en) * | 2002-12-16 | 2004-06-30 | 威海万丰镁业科技发展有限公司 | Magnesium alloy hub pressure casting apparatus and method thereof |
| JP2012126960A (en) * | 2010-12-15 | 2012-07-05 | Isuzu Motors Ltd | Aluminum composite material and method for producing the same |
| JP2013076145A (en) * | 2011-09-30 | 2013-04-25 | Taiheiyo Cement Corp | Method for manufacturing composite material sheet |
| CN103203602A (en) * | 2013-04-15 | 2013-07-17 | 中国兵器工业第五二研究所 | Production method of magnesium alloy hub |
| CN103255329A (en) * | 2013-05-07 | 2013-08-21 | 宝山钢铁股份有限公司 | Low-cost fine-grain weak-texture magnesium alloy sheet and manufacturing method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 中华人民共和国国家质量监督检验检疫总局: "《中华人民共和国国家标准》", 3 November 2003 * |
| 王迎新: "Mg-Al合金晶粒细化、热变形行为及加工工艺的研究", 《中国博士学位论文全文数据库工程科技I辑》 * |
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