CN103722150A - Magnesium alloy pressure casting integrated controlling and managing method - Google Patents
Magnesium alloy pressure casting integrated controlling and managing method Download PDFInfo
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- CN103722150A CN103722150A CN201310741082.0A CN201310741082A CN103722150A CN 103722150 A CN103722150 A CN 103722150A CN 201310741082 A CN201310741082 A CN 201310741082A CN 103722150 A CN103722150 A CN 103722150A
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Abstract
The invention belongs to the technical field of casting, and particularly relates to a magnesium alloy pressure casting integrated controlling and managing method. The magnesium alloy pressure casting integrated controlling and managing method comprises the first step of melting process, the second step of die improving, the third step of die preheating and the fourth step of pouring. The magnesium alloy pressure casting integrated controlling and managing method has the advantages that a casting cast through the magnesium alloy pressure casting integrated controlling and managing method is enough in pouring quantity and not prone to cracking, and overcomes the defects of shrinkage cavities, air holes and the like.
Description
Technical field
The invention belongs to casting technique field, particularly relate to a kind of integrated control and management method of magnesium alloy pressure-casting.
Background technology
Wheel hub is the vehicles such as bicycle, electric motor car one of the most important parts of improving quality, and is also one of most important parts simultaneously.The weight of wheel hub is the key factor that affects vehicle performance, and its weight alleviates a bit a little, all will obviously improve startability, braking quality, the turn performance of car load and the consumption that reduces vehicle electric energy.In all technologic materials, magnesium alloy is the lightest, and the density of magnesium only has 1.74 grams every cubic centimetre, and the magnesium alloy that the magnesium of take is base is approximately lighter by 36% than aluminium alloy, approximately lighter by 73% than kirsite, approximately lighter by 77% than steel.And magnesium alloy also has high specific strength, than series of advantages such as elastic modelling quantity, good rigidity, damping properties, meanwhile, the thermal fatigue resistance of magnesium is obviously better than aluminium, so the useful life of magnesium alloy hub is longer than aluminium alloy.
The traditional casting technique of wheel hub has permanent mold casting and sand casting.Sand casting is compared in permanent mold casting, and tool has the following advantages: its mechanical property ratio sand-cast is high; Precision and the surface smoothness of foundry goods are higher than sand-cast, and quality and dimensionally stable; The technique recovery rate of foundry goods is high, and liquid metals consumption reduces, and generally can save 15-30%; Without sand or use less sand, generally can save Modeling Material 80-100%; In addition, the production efficiency of permanent mold casting is high; The reason that makes foundry goods produce defect reduces; Technique is simple, easily realizes mechanization and automation.If will there is following shortcoming but produce wheel hub with traditional metal mould casting process: metal mold is airtight, and without deformability, easily causes the defects such as foundry goods misrun, cracking, shrinkage cavity, pore; During permanent mold casting, the operating temperature of mold, the pouring temperature of alloy and pouring type etc. are larger on the impact of the quality of foundry goods.Therefore, the magnesium alloy hub of employing traditional metal mold casting is difficult to reach the instructions for use of mechanical properties.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of integrated control and management method of magnesium alloy pressure-casting, the above-mentioned defect existing to overcome prior art.
The technical scheme of technical solution problem of the present invention is as follows, and the integrated control and management method of magnesium alloy pressure-casting comprises the following steps:
The first step, smelting technology
Magnesium alloy is put into molten magnesium stove and melt, liquid magnesium alloy temperature is controlled at 670-680 ℃, adopts gas shield device that SF6 and N are provided
2to the magnesium alloy liquid level covering protection after fusing, gas shield adopts the protected mode of SF6 and N2 mist, nitrogen flow is controlled at 20-25L/min, bottleneck pressure is controlled at 0.2-0.3Mpa, SF6 flow-control is at 18-20ml/min, and bottleneck pressure is controlled at 0.15-0.2Mpa, and the two enters molten magnesium stove after mixing, mixed gas outlet is evenly distributed on liquid magnesium alloy top, and melting chamber and casting room adopt the gas distribution principle of 6:4;
Second step, die improvement:
Optimized mould gate design, increased sprue bush diameter and be increased to 20mm by 18, increased the mobility that aluminium alloy enters mould, improved pull bar, by former single pushing-type, become plug-typely, made it steadily release product, guaranteed that product is indeformable;
The 3rd step, mould and die preheating:
Mold temperature scope control, at 240-280 ℃, when mold temperature is low, adopts the method for manufacturing fast, when mold temperature is high, adopts releasing agent cooling.
The 4th step, casting process;
Casting process is undertaken by three phases; First stage: formed by two sections of 0-I and I-II.0-I section be injection punch head with low-speed motion, seal pouring slot, promote molten metal and steadily rise in injection chamber, injection room air is slowly discharged, and prevents that molten metal from spilling from cast gate; I-II section is injection punch head with speed motion faster, makes molten metal be full of injection chamber front end and piles up in ingate forward position; Second stage: II-III section, in the injection punch head rapid movement stage, makes molten metal be full of whole die cavity and running gate system; Phase III: III-IV section, in the injection punch head final pressure stage, injection punch head motion stops substantially, and speed reduces to 0 gradually; The amount that second stage is compressed into mould by liquid magnesium alloy is controlled between 54-55%, and the amount that the phase III is compressed into mould by liquid magnesium alloy is controlled between 42-43%, is controlled at 2.4s-3.0s the duration of pouring.
Beneficial effect of the present invention is: sufficient, not easy to crack by the casting pouring amount of the integrated control and management method casting of magnesium alloy pressure-casting of the present invention, solved the defects such as shrinkage cavity, pore simultaneously.
accompanying drawing explanation:
Fig. 1 is method flow diagram of the present invention.
Fig. 2 is the 4th step first stage of technological process of the present invention and second stage course of work schematic diagram.
Fig. 3 is the 4th step phase III of technological process of the present invention course of work schematic diagram.
the specific embodiment:
By reference to the accompanying drawings, the present invention will be further described, consults Fig. 1, and the integrated control and management method of magnesium alloy pressure-casting comprises the following steps:
The first step, smelting technology
Magnesium alloy is put into molten magnesium stove and melt, liquid magnesium alloy temperature is controlled at 670-680 ℃, adopts gas shield device that SF is provided
6and N
2to the magnesium alloy liquid level covering protection after fusing, gas shield adopts the protected mode of SF6 and N2 mist, nitrogen flow is controlled at 20-25L/min, bottleneck pressure is controlled at 0.2-0.3Mpa, SF6 flow-control is at 18-20ml/min, and bottleneck pressure is controlled at 0.15-0.2Mpa, and the two enters molten magnesium stove after mixing, mixed gas outlet is evenly distributed on liquid magnesium alloy top, and melting chamber and casting room adopt the gas distribution principle of 6:4;
Second step, die improvement:
Optimized cast gate design, increased sprue bush diameter and be increased to 20mm by 18, increased the mobility that aluminium alloy enters mould, improved pull bar, by former single pushing-type, become plug-typely, made it steadily release product, guaranteed that product is indeformable;
The 3rd step, mould and die preheating:
Mold temperature scope control, at 240-280 ℃, when mold temperature is low, adopts the method for manufacturing fast, when mold temperature is high, adopts releasing agent cooling.
The 4th step, casting process;
Casting process is undertaken by three phases; In conjunction with Fig. 2, the first stage: formed by two sections of 0-I and I-II.0-I section be injection punch head with low-speed motion, seal pouring slot, promote molten metal and steadily rise in injection chamber, injection room air is slowly discharged, and prevents that molten metal from spilling from cast gate; I-II section is injection punch head with speed motion faster, makes molten metal be full of injection chamber front end and piles up in ingate forward position; In conjunction with Fig. 2, second stage: II-III section, in the injection punch head rapid movement stage, makes molten metal be full of whole die cavity and running gate system; In conjunction with Fig. 3, the phase III: III-IV section, in the injection punch head final pressure stage, injection punch head motion stops substantially, and speed reduces to 0 gradually; The amount that second stage is compressed into mould by liquid magnesium alloy is controlled between 54-55%, and the amount that the phase III is compressed into mould by liquid magnesium alloy is controlled between 42-43%, is controlled at 2.4s-3.0s the duration of pouring.
Claims (1)
1. the integrated control and management method of magnesium alloy pressure-casting, comprises the following steps:
The first step, smelting technology
Magnesium alloy is put into molten magnesium stove and melt, liquid magnesium alloy temperature is controlled at 670-680 ℃, adopts gas shield device that SF6 and N are provided
2to the magnesium alloy liquid level covering protection after fusing, gas shield adopts the protected mode of SF6 and N2 mist, nitrogen flow is controlled at 20-25L/min, bottleneck pressure is controlled at 0.2-0.3Mpa, SF6 flow-control is at 18-20ml/min, and bottleneck pressure is controlled at 0.15-0.2Mpa, and the two enters molten magnesium stove after mixing, mixed gas outlet is evenly distributed on liquid magnesium alloy top, and melting chamber and casting room adopt the gas distribution principle of 6:4;
Second step, die improvement:
Optimized mould gate design, increased sprue bush diameter and be increased to 20mm by 18, increased the mobility that aluminium alloy enters mould, improved pull bar, by former single pushing-type, become plug-typely, made it steadily release product, guaranteed that product is indeformable;
The 3rd step, mould and die preheating:
Mold temperature scope control, at 240-280 ℃, when mold temperature is low, adopts the method for manufacturing fast, when mold temperature is high, adopts releasing agent cooling;
The 4th step, casting process;
Casting process is undertaken by three phases; First stage: formed by two sections of 0-I and I-II;
0-I section be injection punch head with low-speed motion, seal pouring slot, promote molten metal and steadily rise in injection chamber, injection room air is slowly discharged, and prevents that molten metal from spilling from cast gate; I-II section is injection punch head with speed motion faster, makes molten metal be full of injection chamber front end and piles up in ingate forward position; Second stage: II-III section, in the injection punch head rapid movement stage, makes molten metal be full of whole die cavity and running gate system; Phase III: III-IV section, in the injection punch head final pressure stage, injection punch head motion stops substantially, and speed reduces to 0 gradually; The amount that second stage is compressed into mould by liquid magnesium alloy is controlled between 54-55%, and the amount that the phase III is compressed into mould by liquid magnesium alloy is controlled between 42-43%, is controlled at 2.4s-3.0s the duration of pouring.
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| CN201310741082.0A CN103722150B (en) | 2013-12-30 | 2013-12-30 | Magnesium alloy pressure casting integrated controlling and managing method |
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| CN201310741082.0A CN103722150B (en) | 2013-12-30 | 2013-12-30 | Magnesium alloy pressure casting integrated controlling and managing method |
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| CN103722150A true CN103722150A (en) | 2014-04-16 |
| CN103722150B CN103722150B (en) | 2015-06-24 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110548854A (en) * | 2019-10-23 | 2019-12-10 | 广东宝洋科技有限公司 | Forging control method for metal product |
| CN112854901A (en) * | 2021-01-30 | 2021-05-28 | 中山科依诺五金科技有限公司 | Mold for casting pouring door handle, door handle manufacturing process and pouring door handle |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1276276A (en) * | 1999-06-08 | 2000-12-13 | 三井金属矿业株式会社 | Metal die device, die-casting method and die-cast articles |
| CN101007342A (en) * | 2007-01-26 | 2007-08-01 | 北京科技大学 | Preparation method of semisolid alloy slurry and rheoforging device |
| US20080164002A1 (en) * | 2007-01-05 | 2008-07-10 | Yurko James A | Die casting machine with reduced static injection pressure |
| CN101396726A (en) * | 2008-11-07 | 2009-04-01 | 李远发 | Molten metal protection method using HFC-134a and nitrogen gas during magnesium alloy pressure-casting process |
-
2013
- 2013-12-30 CN CN201310741082.0A patent/CN103722150B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1276276A (en) * | 1999-06-08 | 2000-12-13 | 三井金属矿业株式会社 | Metal die device, die-casting method and die-cast articles |
| US20080164002A1 (en) * | 2007-01-05 | 2008-07-10 | Yurko James A | Die casting machine with reduced static injection pressure |
| CN101007342A (en) * | 2007-01-26 | 2007-08-01 | 北京科技大学 | Preparation method of semisolid alloy slurry and rheoforging device |
| CN101396726A (en) * | 2008-11-07 | 2009-04-01 | 李远发 | Molten metal protection method using HFC-134a and nitrogen gas during magnesium alloy pressure-casting process |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110548854A (en) * | 2019-10-23 | 2019-12-10 | 广东宝洋科技有限公司 | Forging control method for metal product |
| CN110548854B (en) * | 2019-10-23 | 2021-12-10 | 广东宝洋科技有限公司 | Forging control method for metal product |
| CN112854901A (en) * | 2021-01-30 | 2021-05-28 | 中山科依诺五金科技有限公司 | Mold for casting pouring door handle, door handle manufacturing process and pouring door handle |
| CN112854901B (en) * | 2021-01-30 | 2023-07-21 | 中山科依诺五金科技有限公司 | Mold for casting and casting door handle, door handle manufacturing process and casting door handle |
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| CN103722150B (en) | 2015-06-24 |
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