CN1193845C - Die casting method for casting thin-wall Mg-alloy - Google Patents
Die casting method for casting thin-wall Mg-alloy Download PDFInfo
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- CN1193845C CN1193845C CNB011148217A CN01114821A CN1193845C CN 1193845 C CN1193845 C CN 1193845C CN B011148217 A CNB011148217 A CN B011148217A CN 01114821 A CN01114821 A CN 01114821A CN 1193845 C CN1193845 C CN 1193845C
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Abstract
The present invention relates to a die casting method for casting thin-wall magnesium alloys. The casting for thin-wall magnesium alloys comprises the following required conditions: a magnesium alloy melting condition, a metal mold designing condition and specific die casting parameters. The present invention not only can manufacture high-quality thin-wall products by die casting from magnesium alloys not suitable for thin-wall casting according to the prior art, but also can manufacture thin-wall die casting products by a hot chamber die casting method regarded as being not suitable for thin-wall casting according to the prior art. The die casting method for casting the thin-wall magnesium alloys of the present invention can manufacture high-quality thin-wall magnesium alloys with high precision and fine surface by die casting.
Description
[technical field]
The invention relates to a kind of pressure casting method of magnesium alloy, be meant a kind of pressure casting method of casting thin-wall Mg-alloy especially.
[background technology]
In recent years, for the ease of carrying, all move towards miniaturization, lightweight as gear of intelligence electronic product such as notebook computer, mobile phone, video cameras, therefore, towards the thin-walled property development, Material Selection is also towards light material simultaneously gradually for the casing of these electronic products.The superiority that magnesium alloy then has high strength, density is little and be convenient to utilize again simultaneously, has screen effect by the produced electronic product enclosure of magnesium alloy, can prevent EMI, therefore becomes the optimal selection of electronic product enclosure aspect material.But; existing magnesium alloy cast also have many defectives; especially aspect the die casting of the casting thin-wall of magnesium alloy; as smelt not smart because of undesirable, the magnesium alloy of die forming scheme in the press casting procedure or during casting parameter control bad; regular meeting causes the blemish of foundry goods, as: current mark, cold burden irritate insatiable hunger, collapse scarce, depression, bubble projection, distortion etc. so that can not obtain high-quality thin-wall product smoothly.
[summary of the invention]
The object of the present invention is to provide a kind of pressure casting method that is applicable to the casting thin-wall Mg-alloy of the high-quality magnesium alloy thin wall product of die casting.
The objective of the invention is to be achieved through the following technical solutions: the present invention provides a kind of magnesium alloy pressure-casting method that is applied to the casting thin-wall of magnesium alloy, it is to required each condition of Mg alloy thin wall casting, comprises that magnesium alloy fusion condition, metal die design condition and die casting parameter thereof are in addition specific.Its magnesium alloy melting condition is: magnesium alloy must be removed oxide and moisture content impose fusion in dropping into calciner before, and must preheating in 150～350 ℃ of temperature ranges, and the magnesium alloy melting temperature is set between 620～720 ℃ comparatively ideal.This metal die design condition is: in running channel when design, held " the running channel cross-sectional area dwindles in the near-lying mode chamber more more ", " play running channel end from main running channel till cross section gradually little " principle; Adjacent cast gate and the distance between the cast gate are set in below the 8mm, and cast gate thickness is between 0.4～1.2mm; The overflow piece is set in die cavity, and overflow piece cast gate thickness is between 0.2～1.0mm, and the thickness of overflow piece own is no more than 4mm; And escape channeling design needs to escape gas in the rear of overflow piece or die cavity place, its ditch depth is between 0.05～0.4mm.The pressure casting method of casting thin-wall Mg-alloy of the present invention can adopt cold chamber die casting or hot chamber diecasting, and when wherein adopting cold chamber die casting, mold temperature is set between 150～300 ℃, and filling speed is below the 10m/sec, and the supercharging after the filling is set at 250kgf/cm
2Adopt that the hot chamber diecasting rule with the filling speed is below the 6m/sec, pressure is 200kgf/cm
2More than the melt magnesium alloy is injected in the die cavity.But the pressure casting method die casting of adopting casting thin-wall Mg-alloy of the present invention goes out high accuracy, the careful high-quality magnesium alloy thin wall product in surface.
Owing to adopted technique scheme, magnesium alloy pressure-casting method of the present invention can die casting go out the product wall thickness below 1.5mm, and high accuracy, the careful high-quality product in surface.
[description of drawings]
The invention will be further described in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is the mould design diagram of the pressure casting method of casting thin-wall Mg-alloy of the present invention.
Fig. 2 is that the mould of the pressure casting method of casting thin-wall Mg-alloy of the present invention designs another visual angle schematic diagram.
[specific embodiment]
The invention relates to the pressure casting method of casting thin-wall Mg-alloy, it comprises magnesium alloy fusion condition, adopt this pressure casting method in metal die design condition and the die casting parameter, the particularly casting thin-wall below 1.5mm, can obtain high accuracy, the careful high-quality magnesium alloy pressure-casting product in surface.
It is liquid for die casting machine die casting that the die casting of magnesium alloy at first needs magnesium ingot is fused, and because the surface of magnesium ingot generally all is adsorbed with moisture content and oxide, therefore all need carry out pre-treatment before imposing fusion in the calciner in that magnesium ingot is dropped into.When carrying out pre-treatment; if the magnesium ingot surface attachment has oxide; at first oxide must be removed; and then moisture content is removed in preheating; general preheat temperature is 150～350 ℃; be preheated to and remove moisture content fully; so far promptly finished the pre-treatment of magnesium ingot; magnesium alloy can drop in the calciner and fuse; melting temperature is located between 620～720 ℃ comparatively desirable; simultaneously; because the chemical property of magnesium is very active, under high temperature and dust state, very easily react and produce burning even blast with oxygen, under the high temperature melt, contact and oxidizing fire takes place for fear of magnesium with oxygen; require the die casting melting system to have good seal during fusion, and the gas that can feed the tool protective effect in stove prevent the oxidation of magnesium liquid.Through facts have proved, with SF
6(sulfur hexafluoride) mixes can prevent effectively in general dry gas or the nitrogen feeding calciner that magnesium liquid is because of the oxygen in the direct ingress of air burns, oxidation deterioration.
In the die casting processing procedure, the die casting design is one of key factor of decision product quality quality, in the pressure casting method of casting thin-wall Mg-alloy of the present invention, die casting all adopts hot die steel to make, see also Fig. 1 to Fig. 2, mould design comprises running channel 10, cast gate 20, overflow piece 30, escape design such as channeling 40.
When carrying out running channel 10 designs, need to hold running channel 10 basal areas " the near-lying mode chamber dwindles more more ", " play running channel end from main running channel till section gradually little " principle, being beneficial to the magnesium alloy molten metal can speed can not reduce when filling, and required acceleration when the molten metal filling can be provided, therefore the volume ratio with running channel 10 volumes and die cavity 50 is designed to: be preferable between 1: 2～1: 3.
End at running channel 10 is provided with cast gate 20, needs during cast gate 20 designs to consider that according to the foundry goods shape shape of cast gate 20 also must satisfy the principle of " moment irritates full, irritates full simultaneously " simultaneously.Therefore, cast gate 20 preferably is opened in die cavity 50 medium casting thicker parts, so that allow molten metal flow into thin place from thick place, and is controlled at the distance between the adjacent gate 20 below the 8mm as far as possible, the thickness of cast gate 20 is roughly between 0.4～1.2mm, to reach the effect of comprehensive filling.
The design fibrous root of overflow piece 30 decides according to the type of flow of molten metal in die cavity 50.The position of cast gate 20 is depended in the position of overflow piece 30, and overflow piece 30 is arranged on other position that die cavity 50 is not established cast gate 20, and design is at the least significant end of flow direction, so that molten metal can not produce turbulent flow.And be divided into several than appropriate to the occasion greatly at overflow piece 30, and the thickness of overflow piece cast gate 32 is between 0.2～1.0mm, and overflow piece 30 thickness own are no more than 4mm, thus it is smooth and easy to guarantee that molten metal flows.
Escape channeling 40 in the place design that the rear or the die cavity 50 of overflow piece 30 need be escaped gas, it provides the passage of gas discharge die cavity 50 in the die cavity 50, the shape of escaping channeling 40 must be consistent with the shape of overflow piece 30, and the degree of depth of escaping channeling 40 can minimize bubble in the product between 0.05～0.4mm.
The pressure casting method of casting thin-wall Mg-alloy of the present invention can adopt cold chamber die casting to carry out die casting, also can adopt hot chamber die casting to carry out die casting.When adopting cold chamber die casting die casting, die casting parameter in its press casting procedure is: mold temperature is set between 150～300 ℃, mold temperature is crossed the low filling that can hinder molten metal, then can produce easy draw or hot tearing owing to reducing setting rate if mold temperature is too high.In cold-chamber die casting machine, there are a feed pipe and mould to be connected, pour the melt magnesium alloy into this feed pipe, utilize the ejaculation bar to push away forward then, being about the following two-period form speed change of 10m/sec through filling speed fills, bad in order to prevent to fill, and the hot tearing when suppressing to solidify or to cool off or the generation of draw, after being filled, the metal die die cavity also must impose supercharging immediately again.Supercharging after general the filling is set in 250kgf/cm
2Below comparatively desirable.The necessary condition of the cold chamber die casting that is casting thin-wall Mg-alloy is set in supercharging after above mold temperature, filling speed, the filling, only meets above-mentioned three conditions and just can cast out high accuracy, the careful thin-section casting in surface.
And when adopting hot chamber die casting diecast magnesium alloy thin-wall product, the melt magnesium alloy is by a gooseneck die cavity of mould to be filled under the driving of oil hydraulic system, and its concrete die casting parameter is set at: with the filling speed below the 6m/sec, 200kgf/cm
2Above pressure is pressed into the high-quality Mg alloy castings that is shaped in the die cavity with molten metal.
Adopt the pressure casting method of aforesaid casting thin-wall Mg-alloy, but die casting go out wall thickness below 1.5mm, the careful high-quality thin-walled die-cast product of high accuracy and surface.
Claims (3)
1. the pressure casting method of a casting thin-wall Mg-alloy, be to be applied to casting thin-wall Mg-alloy, and can obtain the pressure casting method of the product of wall thickness below 1.5mm, it comprises magnesium alloy fusion condition, metal die design condition and die casting parameter, it is characterized in that: must carry out pre-treatment magnesium alloy imposes fusion in dropping into calciner before and remove oxide and moisture content, and preheating between 150～350 ℃, magnesium alloy has in the calciner of good seal one and fuses, its melting temperature and feeds the protective gas prevent the oxidation of melt magnesium alloy in this calciner between 620～720 ℃; During the metal die design, " the running channel section dwindles in the near-lying mode chamber more more ", " play running channel end from main running channel till section gradually little " principle are held in running channel design, during the cast gate design distance between the adjacent gate is set in below the 8mm, cast gate thickness is between 0.4～1.2mm; Other position of not establishing cast gate at die cavity is provided with the overflow piece, and the thickness of overflow piece own is no more than 4mm; Be provided with in the place that the rear or the die cavity of overflow piece need be escaped gas and escape channeling, ditch depth is between 0.05～0.4mm; This method can adopt cold-chamber die casting machine or hot chamber machine to come the diecast magnesium alloy thin-wall product, when adopting cold-chamber die casting machine die casting, mold temperature is set between 150～300 ℃, and molten metal is with the two-period form speed change loading mould cavity below the 10m/sec, and the supercharging after the filling is set at 250kgf/cm
2More than; When adopting hot chamber machine die casting, molten metal is that the pressure during filling is set at 200kgf/cm with the speed loading mould cavity below the 6m/sec
2More than.
2. the pressure casting method of casting thin-wall Mg-alloy as claimed in claim 1, it is characterized in that: the protective gas that feeds in this smelting furnace is SF
6Mist with general dry gas.
3. the pressure casting method of casting thin-wall Mg-alloy as claimed in claim 1, it is characterized in that: the protective gas that feeds in this smelting furnace is SF
6Mist with nitrogen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011148217A CN1193845C (en) | 2001-05-22 | 2001-06-15 | Die casting method for casting thin-wall Mg-alloy |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN01114734.2 | 2001-05-22 | ||
| CN01114734 | 2001-05-22 | ||
| CNB011148217A CN1193845C (en) | 2001-05-22 | 2001-06-15 | Die casting method for casting thin-wall Mg-alloy |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1386600A CN1386600A (en) | 2002-12-25 |
| CN1193845C true CN1193845C (en) | 2005-03-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011148217A Expired - Fee Related CN1193845C (en) | 2001-05-22 | 2001-06-15 | Die casting method for casting thin-wall Mg-alloy |
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| CN (1) | CN1193845C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2003904394A0 (en) * | 2003-08-15 | 2003-08-28 | Commonwealth Scientific And Industrial Research Organisation | Flow system for pressure casting |
| CN1299858C (en) * | 2005-03-24 | 2007-02-14 | 沈阳铸造研究所 | Magnesium alloy low-pressure casting method |
| CN100355519C (en) * | 2006-07-07 | 2007-12-19 | 瑞玛泰（北京）科技有限公司 | Magnesium alloy liquid controlling device |
| CN103192051B (en) * | 2013-04-03 | 2015-09-30 | 福建省瑞奥麦特轻金属有限责任公司 | The manufacture method of a kind of ultra-thin-wall light metal alloy shell or framework |
| CN104399935A (en) * | 2014-11-05 | 2015-03-11 | 镁联科技（芜湖）有限公司 | Cold chamber die casting machine and mould for same |
| CN112338163B (en) * | 2020-10-21 | 2022-04-01 | 重庆博奥镁铝金属制造有限公司 | Die-casting processing method for product with isolated structure |
-
2001
- 2001-06-15 CN CNB011148217A patent/CN1193845C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1386600A (en) | 2002-12-25 |
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Assignee: Fuyu precise component (Kunshan) Co., Ltd. Assignor: Hongfujin Precise Industry (Shenzhen) Co., Ltd.|Hon Hai Precision Industry Co., Ltd. Contract fulfillment period: 2008.7.1 to 2021.6.15 contract change Contract record no.: 2009990000155 Denomination of invention: Die casting method for casting thin-wall Mg-alloy Granted publication date: 20050323 License type: Exclusive license Record date: 2009.3.6 |
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