CN100355519C - Magnesium alloy liquid controlling device - Google Patents
Magnesium alloy liquid controlling device Download PDFInfo
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- CN100355519C CN100355519C CNB2006100896433A CN200610089643A CN100355519C CN 100355519 C CN100355519 C CN 100355519C CN B2006100896433 A CNB2006100896433 A CN B2006100896433A CN 200610089643 A CN200610089643 A CN 200610089643A CN 100355519 C CN100355519 C CN 100355519C
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Abstract
The magnesium alloy liquid controlling apparatus belongs to the field of magnesium alloy die casting technology. The magnesium alloy liquid controlling apparatus includes a fast smelting furnace and a stirring measurement device connected through a siphon with electrically isolating and heat insulating layer. The fast smelting furnace includes a crucible, an inducing winding, a sliding door, a protecting gas supplying pipe, a movable base below the crucible and a billet supporting frame to limit the molten billet in the center of the smelting furnace. The stirring measurement device includes a temperature controlling tube, a single spiral speed varying drive, a linear translation drive, an inlet valve, an outlet valve, a volume controlling piston, a protecting gas supply tube and a conveying pipe. The present invention has the advantages of small size, flexible operation, low cost and simple maintenance.
Description
Technical field
The invention belongs to the die-casting technique field of magnesium and magnesium alloy, a kind of magnesium alloy liquid controlling device particularly is provided.
Background technology
Invention is about the die casting of magnesium and magnesium alloy (HPDC).Extrusion process is a kind of metal fabrication methods of producing a large amount of metal parts, has the characteristics of high efficiency, low cost and high-quality.Therefore, aspect the auto industry and the consumer goods, use extensively.Generally, die casting can be divided into hot chamber diecasting technology and cold chamber die casting technology.In hot chamber diecasting technology, injection rod is immersed in the metal bath of heat, and liquid metal is sent in the die cavity by the S shape pipeline of the so-called gooseneck of a heating; And in cold chamber die casting technology, be that liquid metal directly is sent in the injection chamber, injection chamber heats without the method for external heat such as heater.Based on their characteristics separately, cold-press process is generally used for aluminium alloy, and heat pressing process is generally used for kirsite.
In cold chamber die casting technology, the liquid metal that the liquid metal control system will have certain alloying component, temperature and weight is sent in the injection chamber, thus, produces required part in the die cavity thereby be pressed into by a hydraulic piston after solidifying.Very roughly, die casting machine is made up of two parts, a liquid metal control system and a part forming system (die casting machine).
This invention is special liquid metal control system at the magnesium alloy cold chamber die casting.。Different with aluminium alloy and kirsite, magnesium and magnesium alloy are very active under liquid state.It has very high vapour pressure, and with oxygen very strong affinity is arranged.Meet with humid air, magnesium and oxygen vigorous reaction cause violent burning.This makes liquid magnesium alloy operation control become a very challenging difficult problem of die carter industry.
Traditional liquid magnesium alloy control system is arranged in steel crucibles and measurement mechanism to die casting machine transmission liquid magnesium that electricity or gas-fired furnace seal by one and forms.The magnesium that melts in the crucible is protected with gas, and protective gas is with being no less than 1% (vol%) SF
6Dry air or be no less than 1% (vol%) SO
2Dry air.Quantitatively realizing with several technology usually of magnesium melt comprises the gas piston pump, reciprocating pump, and centrifugal pump, vacuum transmission system, electromagnetic pump, Archimedean screw pump and siphon pipe gravity for transport, back two kinds is the most frequently used quantitative technique.In order to reduce the oxidation in the magnesium fusing, twin furnace system commonly used control liquid magnesium.The special design of one of them stove is used as and receives and the fusing magnesium ingot, and another stove is used for being incubated and carries magnesium melt in die casting machine.Melting furnace and holding furnace keep melt to be in same level in two stoves by a siphon pipe.This must cause the liquid metal control system huger on volume.
The main effect of liquid metal control system is exactly the pure magnesium melt with uniform temperature that amount is determined in transmission in die casting machine.The pure magnesium melt here refers to and contains minimum oxygen and metal inclusion and do not contain any metal impurities such as Ni, Cu, Fe.Yet, that conventional liquid metal control system solves for this basic demand and not fully up to expectations.
The oxidizing process of understanding in the smelting furnace can help us to discern problem in the liquid metal control system, and finds out solution.Oxidizing process in the magnesium smelting furnace is described in detail with Fig. 6.In the steel crucibles 8 of bell 1 sealing, protective gas (has mixed 0.5%SF
6Dry air) 2 be transferred to the space that has occupied the liquid metal top in the crucible.SF
6Heavier-than-air many, just between dry air and magnesium melt, formed one deck SF
6Layer 3.Be exactly this SF
6Layer of inert provides main protection for magnesium alloy fused mass.At SF
6With the interface of magnesium melt, residual oxygen and liquid magnesium react and form solid oxide magnesium (MgO), and this is the main component of magnesium melt top viscosity slag blanket (oxide layer) 4.The MgO particle is heavier than liquid magnesium, can form the last crucible bottom that arrives of oxide 6 a large amount of depositions gradually, becomes the main source of so-called slag mud 7.Gravity orders about oxide particle by magnesium melt 5 precipitations.Settling velocity is directly proportional with the density contrast of melt and oxide particle, is inversely proportional to the viscosity of melt.Slag blanket is thick more, perhaps liquid-metal layer rare more (being that viscosity is more little), and perhaps slag blanket is owing to the dress ingot destroys.Oxide sinks to aggravating more.Obviously, as long as one deck slag blanket is arranged, just inevitable by the oxide particle (Fig. 6) of magnesium melt so on the melt top.Therefore, melt can not be pure, and inevitably have the formation of slag mud at furnace bottom.
The slag mud that forms in the conventional furnaces and the main chemical compositions of oxide layer are as shown in table 1.Have 50% to be oxide in the oxide layer, have 30% to be oxide in the slag mud.As can be seen from Table 1, the formation of oxide layer and slag mud has caused the loss of a large amount of melts in the liquid metal control procedure.
The typical chemical composition of fused mass in table 1 conventional furnaces
| Fused mass | AZ91D | Slag mud | Oxide layer |
| Metal, % | 99.95 | 70 | 50 |
| Oxide, % | 0.05 | 30 | 50 |
On scientific meaning, as other chemical reaction, the amount of oxidation product and oxidation rate and oxidization time are directly proportional.In order to reduce oxidation, should reduce the time of staying of oxidation rate and liquid metal.And, according to kinetics, reduce reaction temperature, SF
6The partial pressure of oxygen of layer and the gross area that is exposed to the magnesium melt in the oxygen just can reduce oxidation rate.In fact, in order to reduce oxidation, one side must reduce the temperature of liquid metal, and the minimizing bath surface amasss the time of staying with melt, must strengthen the validity of protective gas on the other hand.This understanding of liquid towards magnesiaization can be used for analysis conventional liquid magnesium control system.
The major defect of present widely used magnesium fusing control system is: (1) is compared with the original oxygen content before the billet fusing, has 10 times even more oxygen to be mingled with and enters into last solid-state part.So high being mingled with arranged in foundry goods, can reduce mechanical property on the one hand, can reduce the corrosion resistance of part on the other hand.(2) another shortcoming of twin furnace system is bulky.In current commercial Application, the volume of smelting furnace need be 3.5 times of general per hour melt consumption rate.The processing operation of this liquid towards metal has very big drawback.A big smelting furnace means the long liquid metal time of staying (2-5 hour usually), and has big bath surface long-pending, and these 2 all help to form more oxide; More oxide just means more oxide layer and more slag mud; Remove the such timing cleaning of oxide layer and slag mud (common a day several times) loaded down with trivial details work with regard to having become a necessity, this not only causes the more off-time, and improves production cost.(3) big smelting furnace costs are higher, also require bigger factory building space and more maintenance work, and these all can increase the cost of a part.(4) oxide layer and slag mud can cause the loss of melt and the deterioration of melt chemical composition.(5)。The top layer of billet, thickness is no more than 10 μ m usually, and it is present in the melt with the form of thin slice, though it is little to form the amount of oxide, has a strong impact on the casting character of magnesium melt.Under given temperature, greatly reduce the flowability of melt, cause and owe casting and cause casting flaw.(6) accuracy of Ce Lianging is low, compares usually with ormal weight to have ± 10% error.When liquid metal is measured when on the low side, the part defectiveness is measured when higher when liquid metal, and loss increases.
(7) peroxidating of melt.Another shortcoming of conventional liquid metal control system is that cold pressing chamber is worked under the temperature of overheated (650-710 ℃) usually.This high melt temperature can cause the peroxidating of melt, thereby causes the oxygen content of last foundry goods to raise.
(8) the melt amount in the smelting furnace is big and have bigger surface area and the consumption of the gas that needs protection is very big.
Therefore, in order to develop effective liquid metal control system, must solve the problem of oxidation of melt.This comprises: (1) by reduce melt temperature, to reduce bath surface long-pending and guarantee that the effective supply of protective gas reduces oxygenation efficiency; (2) time of staying of shortening melt; (3) by dispersal oxide cluster and refinement billet top layer the illeffects that is mingled with in the smelting furnace is reduced as far as possible; (4) temperature of transmission liquid metal should help the refinement consolidated structure.
Summary of the invention
The object of the present invention is to provide a kind of magnesium alloy liquid controlling device, solved effective protection of magnesium alloy fused mass and quantitatively conveying accurately.By with eddy-current heating as heater means, realize magnesium ingot is melted to the temperature that needs fast, the accurate liquid magnesium of amount is sent in the cold pressing chamber of die casting machine to finish part production.Can provide efficient temperature control to the accuracy and the homogeneity of melt temperature.
Reduce the illeffects of oxide inclusions by an agitating device to the mechanical property of final part.This agitating device can disperse oxide cluster and the refinement billet top layer in the melt, and an even distribution with meticulous oxide particle of tight structure is provided.Therefore can transmit liquid metal under an accurate even temperature, can cast in a bigger temperature range, promptly the temperature on the liquidus curve of alloy (crossing thermalloy) is to the temperature below the liquidus curve of alloy (semi-solid casting).
Control device of the present invention comprises: quick smelting furnace 10, stirring measurement mechanism 20; Fast smelting furnace 10 with stir that the siphon pipe 43 with the tape insulation heat-insulation layer links to each other between the measurement mechanism 20.
Fast smelting furnace comprises: crucible 11, induction coil 12, sliding door 13, protective gas supply pipe 14, movably pedestal 15, billet support frame 16, the pottery of cylindrical shape (perhaps steel) crucible 11, induction coil 12 seal smelting furnace from the top as heater, sliding door 13, and protective gas supply pipe 14, movably pedestal 15 is placed on crucible bottom; Billet support frame 16 is limited in smelting furnace central authorities to the billet 17 of fusion.
Crucible 11 is rounded, and height equals 3-5 with diameter ratio.The volume of crucible should be complementary with the melting capacity of induction coil and the consumption rate of die casting machine liquid towards metal.The material of crucible is selected ceramic material or steel.
Induction coil 12 is positioned at the skin of crucible 11, and the two is entwined by copper pipe every with insulating materials, middle water flowing cooling.Frequency and power input are complementary with the crucible capacity, can realize quick fusing, and the magnesium alloy consumption rate with die casting machine is complementary simultaneously.
Sliding door 13 is positioned at the upper edge of crucible 11, and the form of adopt sliding can make the magnesium ingot of preheating place than being easier to, thereby and to inside furnace seal avoid smelting furnace inside and outside any gas exchange.
Protective gas supply pipe 14 penetrates crucible by the upper edge of crucible 11 and induction coil 12, along the pipe of the even in the form of a ring distribution circle pass outlet of inwall.Make protective gas come air inlet stably according to certain composition and consumption rate.Protective gas is to be mixed with SF
6Or SO
2Dry air.
Pedestal 15 is positioned in crucible 11 bottoms, the induction coil 12, is detachable.Adopt and the crucible identical materials, its heat insulating function can make the heat loss minimum of pedestal, and sealing function can be avoided from any leakage in slit between crucible and the pedestal, and the slag mud of the feasible cleaning of easy access crucible inside and periodic maintenance become and be easy to.
Billet support frame 16 is placed on the central authorities of crucible 11, joins with pedestal 15 below.It mainly acts on is the middle position that the billet 17 of fusion is limited in smelting furnace, can obtain more effective heating like this.The another one effect of billet support frame is exactly to reduce billet influence to crucible in put procedure.Another effect of billet support frame is to collect the bulk that billet introduces and be mingled with by place a suitable filter 18 in the billet support frame.
The main effect of smelting furnace is fast: accept the billet from preheating station; The liquid towards metal provides effective protection; Billet is converted to liquid metal fast; Preliminary control to melt temperature; Cleaning measure to oxide layer and slag mud; Provide pure liquid metal for stirring proportioning device.
The stirring measurement mechanism comprises: temperature application cylinder 21, single-screw 22, variable speed drive 23, the reciprocating rectilinear translation transmission device 24 of control spiral organ, imported valve 40, outlet valve 50, volume controlled piston 27, protective gas supply pipe 28, transfer tube 29.
Stirring is to finish under the protective gas that protective gas supply pipe 28 is supplied with.Consider liquid metal strong stirring movement of carrying out in agitator, the protective effect of protective gas should be more effective than conventional liquid metal control system.Preferable protective gas is argon gas, nitrogen or has mixed a certain amount of SF
6Or SO
2Gas.In addition, protective gas should be taked slowly uniformly mode of movement, and the pipeline by a multiple exit is transported in the temperature application cylinder.
Imported valve (40 among Fig. 3) is liquid metal to be sent to from smelting furnace 10 by a siphon pipe 43 stir in the measurement mechanism 20.Imported valve 40 is made up of a valve body 41 and a temperature controlled siphon pipe 43 that is installed in above the helical axis 42.
Outlet valve (50 among Fig. 5) is positioned at the bottom of temperature application cylinder 21, is made up of outlet valve main body 51 and outlet valve seat 54.Outlet valve main body 51 is fixed on the helical axis 42 and rotates along with spiral.Carry out linear translational motion along helical axis, thereby in whipping process, seal exit passageway 52, open exit passageway 52 when the liquid metal of handling discharges.Be that the liquid metal of handling is transferred in the injection chamber from stir measurement mechanism by a transfer tube 29.The rate of discharge of outlet valve changes by the slewing rate that changes spiral.
Realize accurately quantitatively (Fig. 1) by the quantitative piston 27 correct location that are installed on the helical axis.Quantitatively piston below 27, temperature application cylinder 21 just are independent injection amounts once with the amount of interior liquid metal.The quantitative fluctuation position 19 high 10-50mm of the height of piston 27 metal bath surface that should produce when in smelting furnace, placing the preheating billet.Temperature application cylinder 21 and quantitatively the clearance control between the piston 27 at 0.2mm, can accomplish gas can be unimpeded and liquid be difficult to by.
The basic role of stirring measurement mechanism is: reach accurate even temperature; The dispersal oxide cluster; The refinement oxide platelet; Accurately measure; Semi solid slurry (can select) is provided; Quick feeding is transferred in the die-casting system.
The invention has the advantages that: fast fusing, the liquid metal time of staying short (be defined as and put into billet to the time interval that forms the solid part), melt temperature is low, measurement is accurate, melt output equipment volume is little, method of operating is flexible.Compare with conventional liquid metal control system, melt is purer before the casting, and oxidation fully reduces, and the formation of oxide layer and slag mud reduces even eliminates, owing to reduced surface area so gas shield is more effective, equipment cost is lower, and plant maintenance still less.
Description of drawings
Fig. 1 is the schematic diagram of liquid metal control system of the present invention.Wherein, the billet 17 of quick smelting furnace 10, crucible 11, induction coil 12, sliding door 13, protective gas supply pipe 14, movably pedestal 15, billet support frame 16, fusion, filter 18, stirring measurement mechanism 20, temperature application cylinder 21, single-screw 22, variable speed drive 23, volume controlled cylinder 27, protective gas supply pipe 28, die casting machine injection chamber 30, imported valve 40, siphon pipe 43, outlet valve 50.
Fig. 2 is the schematic diagram that is used for the stirring measurement mechanism of liquid metal control system of the present invention.Wherein, transfer tube 29, heating element heater 31, cooling duct 32.The reciprocating rectilinear translation transmission device 24 of control single-screw, transfer tube 29.
Fig. 3 is the schematic diagram that is used for the inlet valve of liquid metal control system of the present invention.Wherein, the gap 48 between valve body 41, helical axis 42, valve body and the temperature application cylinder.
Fig. 4 is the schematic diagram that is used for the inlet valve A-A cross section of liquid metal control system of the present invention.Wherein, cylinder 44,45, stirring vane 46, open channel 47,
Fig. 5 is the schematic diagram that is used for the outlet valve of liquid metal control system of the present invention.Wherein, helical axis 42, outlet valve main body 51, exit passageway 52, outlet valve seat 54.
Fig. 6 is the oxidizing process schematic diagram of conventional liquid metal control system in the extrusion process.Wherein, bell 1, protective gas 2, SF
6Gas blanket 3, oxide layer 4, magnesium alloy fused mass 5, oxide 6, slag mud 7, crucible 8.
The specific embodiment
An independent billet is put into the smelting furnace 10 from the position of preheating.Billet 17 immerses in the melt and vertical standing in the billet support frame 16, and melts fast in the original place under the forceful action of load coil 12.Because the stirring behavior in magnetic field, the melt temperature of inside furnace should be more uniform.The stirring measurement mechanism of this invention is operated in a looping fashion.In the beginning of one-period, the single-screw 22 of rotation by under the position, imported valve is open like this, outlet valve is closed.Melt in the smelting furnace is sent to by siphon pipe 43 and stirs in the measurement mechanism 20.Quantitatively the determining positions of piston 27 inlet amount be the required amount accurately of an injection.The melt that stirs in the measurement mechanism 10 carries out strong agitation by the single-screw 22 that rotates.After the stirring of carrying out a period of time, single-screw is mentioned, close imported valve, open outlet valve, like this liquid metal after stirring is discharged into 30 li of the injection chambers of die casting machine.After the discharging, spiral be put into by under the position, close outlet valve, open imported valve, for following one-period prepares.In each periodic process, the spiral rotary speed is set different levels respectively according to charging, stirring and the discharging of liquid metal.
The liquid metal control system is the major part of whole die-casting system.The all functions unit should carry out synchronously by a central control unit.
The liquid metal control system of this invention takes three kinds of different modes to operate.A kind of is when part forming over-heat metal to be sent in the injection chamber from stir measurement mechanism.This method can guarantee the flowability that liquid metal is high, is suitable for the die casting thin-walled parts.Another kind of mode is to stir measurement mechanism and set the temperature near the work metal liquidus curve.Form semi solid slurry by the overall nucleation rate that improves liquid metal in the injection chamber with low fraction solid.So-called liquidus curve casting that Here it is.This method is suitable for casting complex parts.The third mode of operation is that the temperature of temperature application cylinder is set between the liquidus curve and solidus of this alloy, thereby forms semi solid slurry in stirring measurement mechanism.The fraction solid of semi solid slurry is adjusted by the temperature that changes the temperature application cylinder.So-called semisolid extrusion process that Here it is is applicable to the exigent part of integrality.
Claims (6)
1, a kind of magnesium alloy liquid controlling device is characterized in that: this device comprises: quick smelting furnace (10), stirring measurement mechanism (20); Fast the siphon pipe (43) with the tape insulation heat-insulation layer links to each other between smelting furnace (10) and the stirring measurement mechanism (20); Fast smelting furnace comprises: crucible (11), induction coil (12), sliding door (13), protective gas supply pipe (14), movably pedestal (15), billet support frame (16), and movably pedestal (15) is placed in crucible bottom, the induction coil (12); Billet support frame (16) is placed on the central authorities of crucible (11), joins with pedestal (15) below, the billet of fusion (17) is limited in the middle position of smelting furnace; Placing filter (18) in the billet support frame collects the bulk that billet introduces and is mingled with; The stirring measurement mechanism comprises: temperature application cylinder (21), single-screw (22), variable speed drive (23), the control reciprocating rectilinear translation transmission device of spiral organ (24), imported valve (40), outlet valve (50), volume controlled piston (27), protective gas supply pipe (28), transfer tube (29); Temperature application cylinder (21) is equipped with heating element heater (31) and cooling duct (32); Single-screw (22) is installed in the temperature application cylinder (21), its top is equipped with variable speed drive (23) and is driven the single-screw rotation, the liquid towards metal gives strong dispersion and displacement stirring action in temperature application cylinder (21), the profile of single-screw (22) is equidistant post spiral, with hydraulic drive or Electric Drive, moving axially by the rectilinear translation transmission device (24) of next-door neighbour's variable speed drive (23) of single-screw (22) realizes, with hydraulic drive or Pneumatic Transmission, transfer tube (29) is fixed on the bottom of temperature application cylinder (21), the liquid metal of handling is transferred in the injection chamber of die casting machine.
2, according to the described device of claim 1, it is characterized in that: crucible (11) is rounded, and height and diameter ratio 3-5, the volume of crucible should be complementary with the melting capacity of induction coil and the consumption rate of die casting machine liquid towards metal, and the material of crucible is selected ceramic material or steel.
3, according to the described device of claim 1, it is characterized in that: induction coil (12) is positioned at the skin of crucible (11), the two is every with insulating materials, be entwined by copper pipe, middle water flowing cooling, frequency and power input are complementary with the crucible capacity, realize fusing fast, and the magnesium alloy consumption rate with die casting machine is complementary simultaneously; Sliding door (13) is positioned at the upper edge of crucible (11), and the form of adopt sliding is placed than being easier to the magnesium ingot of preheating, thereby and to inside furnace seal avoid smelting furnace inside and outside any gas exchange; Protective gas supply pipe (14) penetrates crucible by the upper edge of crucible (11) and induction coil (12), and the pipe along the even in the form of a ring distribution circle pass outlet of inwall makes protective gas come air inlet stably according to certain composition and consumption rate.
4, according to the described device of claim 1, it is characterized in that: imported valve is liquid metal to be sent to from smelting furnace (10) by a siphon pipe (43) stir in the measurement mechanism (20), and imported valve (40) is made up of a valve body (41) and a temperature controlled siphon pipe (43) that is installed in above the helical axis (42); Valve body is made up of two cylinders (44,45) that are connected with stirring vane (46), what valve body (41) was firm is installed on the helical axis, stirring vane (46) liquid towards metal in whipping process stirs, liquid metal flows between top of stirring measurement mechanism (20) and bottom by the open channel (47) of valve body (41), spiral carries out rectilinear translation along helical axis, siphon pipe is open in whipping process, and siphon pipe is closed when agitator is discharged state.
5, according to the described device of claim 1, it is characterized in that: outlet valve is positioned at the bottom of temperature application cylinder (21), outlet valve main body (51) is fixed on helical axis (42) and upward rotates along with spiral, outlet valve (50) carries out linear translational motion along helical axis, in whipping process, seal exit passageway (52), open exit passageway (52) is transferred to the liquid metal of handling in the injection chamber from stir measurement mechanism by transfer tube (29) again when the liquid metal of handling discharges.
6, according to the described device of claim 1, it is characterized in that: realize accurately quantitatively that by the correct location of quantitative piston (27) that is installed on the helical axis quantitative piston (27) is following, temperature application cylinder (21) just is an independent injection amount once with the amount of interior liquid metal; Temperature application cylinder (21) and quantitatively the clearance control between the piston (27) at 0.2mm, accomplish gas can be unimpeded and liquid be difficult to by.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100896433A CN100355519C (en) | 2006-07-07 | 2006-07-07 | Magnesium alloy liquid controlling device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100896433A CN100355519C (en) | 2006-07-07 | 2006-07-07 | Magnesium alloy liquid controlling device |
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| CN100355519C true CN100355519C (en) | 2007-12-19 |
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| CNB2006100896433A Expired - Fee Related CN100355519C (en) | 2006-07-07 | 2006-07-07 | Magnesium alloy liquid controlling device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102389964B (en) * | 2011-11-11 | 2013-04-10 | 上海交通大学 | Magnesium alloy melt protector |
| CN103846408A (en) * | 2012-11-28 | 2014-06-11 | 沈国宝 | Improved pressure casting smelter |
| US9445459B2 (en) * | 2013-07-11 | 2016-09-13 | Crucible Intellectual Property, Llc | Slotted shot sleeve for induction melting of material |
| US9873151B2 (en) | 2014-09-26 | 2018-01-23 | Crucible Intellectual Property, Llc | Horizontal skull melt shot sleeve |
| CN106676276B (en) * | 2017-01-13 | 2018-05-08 | 新疆金盛镁业有限公司 | Inert atmosphere protection magnesium liquid presses conduction transfer device |
| CN109413977B (en) * | 2018-11-08 | 2019-10-25 | 天津大学 | A kind of safety protection device for handset based on liquid metal |
| CN110548852B (en) * | 2019-09-04 | 2021-03-30 | 仁兴机械（佛山）有限公司 | Injection device |
| CN111136237A (en) * | 2020-01-06 | 2020-05-12 | 广州市丹爵通讯科技有限公司 | A die-casting equipment that is used for having quantitative function of 5G intensifier |
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| CN1386600A (en) * | 2001-05-22 | 2002-12-25 | 鸿富锦精密工业（深圳）有限公司 | Die casting method for casting thin-wall Mg-alloy |
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