CN103331432A - Vacuum die casting method of rare earth-magnesium alloy - Google Patents
Vacuum die casting method of rare earth-magnesium alloy Download PDFInfo
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Abstract
The invention discloses a vacuum die casting method of rare earth-magnesium alloy. Pure magnesium ingots and Mg-90% Gd, Mg-25% Y and Mg-30% Zr intermediate alloy are melted and mixed firstly, and then a Japan 250-ton cold room horizontal type die-casting machine carries out die-casting on molten metal. The method comprises the steps that a die is preheated to reach 150-180 DEG C, then 680-720 DEG C metal alloy melts are added in the die, a punch enters the die in a pressing mode at the 200-300mm/s speed, when the punch advances by 120mm, the die-casting machine is vacuumized to reach 6-15kPa, the punch keeps the advancing state, when the punch advances by 255-260mm, the punch enters the die in a pressing mode at the 4-6m/s speed, the boost pressure is set to be 12-13Mpa, then die-casting is finished, and the punch is taken out after metal is cooled. Air holes and shrinkage porosity and cavities of castings obtained according to the method are reduced, and the tensile strength, the yield strength and the ductility are improved.
Description
Technical field
The present invention relates to a kind of preparation method of metal alloy compositions, be specifically related to a kind of evacuated die-casting process method of magnesium-rare earth.
Background technology
Magnesium alloy has advantages such as density is little, quality is light, specific strength is high, machinability is good, is widely used in Aero-Space, traffic and electronic product field.Present stage, the magnesium alloy materials overwhelming majority adopts pressure casting methods to be shaped, and this method is to make liquid metal under the high pressure effect, with high speed filling mold cavity, and cooled and solidified and obtain a kind of manufacturing process of foundry goods under pressure.
In above-mentioned conventional pressure casting method, because molten metal is with high velocity jet state filling die cavity, most of gas in the die cavity has little time to discharge and is rolled into inevitably in the molten metal, and retains in the foundry goods with form of pinholes, so gas hole defect inevitably appears in common die casting.People such as Lee Soon Gi research thinks that the pore that forms in the die casting process of setting can influence its heat transfer of molten metal on every side, thereby makes pore easily form shrinkage porosite on every side.And the existence of pore, make conventional die casting be difficult to heat-treat, weld or be used for the part that air-tightness is had relatively high expectations, also cause the mechanical property of die casting to can not get further raising, limited the application of die casting on important or large complicated stressed member such as car, motorcycle security personnel part.
For a long time, in order to improve the performance of conventional die casting, widen the range of application of die casting, people study conventional pressure casting method, especially the relation of pressure casting method and die casting performance and defective.But in conventional press casting procedure, gas hole defect and the performance issue of bringing thereof almost can not be well solved.Simultaneously, people have have also researched and developed some new special pressure casting methods, as laminar flow filling method or Ultra-Low Speed casting die, pore-free die casting method etc.The main purpose of said method all is to reduce the volume tolerance in the molten metal filling process, thereby improves the mechanical property of foundry goods.Because the laminar flow filling method exists production efficiency low, shortcoming such as pore-free die casting method operational sequence complexity, method parameter are wayward is so these two kinds of methods are used very few in the actual production.
The evacuated die-casting process rule is that the gas in the die cavity is extracted out, and molten metal is at vacuum state retrofilling die cavity, thereby the gas that is involved in is few, the mechanical property height of foundry goods.And evacuated die-casting process is the same with common pressure casting method, and is easy to operate, do not reduce production efficiency, so vacuum die-casting method has shown great vitality since occurring, along with the raising of correlation technique, its application is more and more extensive.But the method aspect of rare-earth magnesium alloy pressure casting moulding, the research of especially evacuated die-casting process method aspect is still immature.
For magnesium-rare earth, heat treatment reinforcement is most important for the improvement of its performance, so the present invention is devoted to develop a kind of evacuated die-casting process method of magnesium-rare earth, under this method condition, the sample of preparation is compared with conventional die casting, and performance improves, after heat treatment, performance is further enhanced, thereby widens Application of Magnesium.
Summary of the invention
The objective of the invention is to overcome above-mentioned the deficiencies in the prior art, a kind of evacuated die-casting process method of magnesium-rare earth is provided.
The purpose of invention can be achieved through the following technical solutions:
A kind of evacuated die-casting process method of magnesium-rare earth may further comprise the steps:
Step 1, pure magnesium ingot and magnesium-rare earth intermediate alloy mixed melting is formed the magnesium-rare earth molten metal, with described molten metal 680～720 ℃ of insulations;
Step 2, with the die casting in die casting machine of above-mentioned magnesium-rare earth molten metal, the die casting parameter arranges as follows: low speed speed is 0.2～0.3m/s, high speed speed is 4～6m/s, high low speed dislocation is 255～260mm; Vacuumize position 120mm, vacuum is 5～15kPa; Pressurization position is 280～290mm, and boost pressure is 12～13MPa.
A kind of evacuated die-casting process method of magnesium-rare earth, further technical scheme is, described die casting machine adopts 250 tons of cold house's horizontal plunger die casting machines of Japan.
A kind of evacuated die-casting process method of magnesium-rare earth, further technical scheme is that described magnesium-rare earth molten metal is Mg-8Gd-3Y-0.5Zr or Mg-6Gd-3Y-0.5Zr.
A kind of evacuated die-casting process method of magnesium-rare earth, further technical scheme is that described magnesium-rare earth molten metal is by SF
6And N
2Mixed gas protected in carry out.
Above-mentioned magnesium-rare earth intermediate alloy specifically refers to: Mg-90%Gd, Mg-25%Y, Mg-30%Zr intermediate alloy.
Preparation magnesium-rare earth molten metal carries out according to the following step: at first pure magnesium ingot and Mg-90%Gd, Mg-25%Y, Mg-30%Zr intermediate alloy are preheated to 150 ℃～250 ℃; Secondly pure magnesium ingot is put into melting furnace, treat the magnesium ingot fusing after, melt temperature is raised to 680 ℃～700 ℃, then Mg-90%Gd and the Mg-25%Y intermediate alloy of preheating are put into smelting furnace, wait to melt fully after, temperature is elevated to 740～760 ℃ again, Mg-30%Zr is put into smelting furnace, after treating that temperature returns to 740～760 ℃, do not cut off the power supply and carry out refining, it is mixed, leave standstill, cool to 680～720 ℃ then, take the scum silica frost on surface off, carry out evacuated die-casting process.
According to the different proportionings of pure magnesium ingot with Mg-90%Gd, Mg-25%Y, Mg-30%Zr intermediate alloy, can obtain the magnesium-rare earth of different component.The chemical composition of magnesium-rare earth used in the present invention is mass percent: 5.5～8.5%Gd, and 2.5～3.5%Y, 0～0.5%Zr, surplus is Mg.
Useful technique effect of the present invention is: adopt method provided by the present invention, the resulting sample pore of die casting obviously reduces, mechanical property is improved, and wherein evacuated die-casting process sample room temperature tensile strength, yield strength, the percentage elongation of Mg-6Gd-3Y-0.5Zr alloy are respectively 249.9MPa, 163.8MPa and 19.5%; The evacuated die-casting process sample room temperature tensile strength of Mg-8Gd-3Y-0.5Zr alloy, yield strength, percentage elongation are respectively 249.7MPa, 198.9MPa and 7.61%.
Description of drawings
Fig. 1 is Mg-8Gd-3Y-0.5Zr alloy casting state metallograph under the embodiment 1 evacuated die-casting process condition;
Fig. 2 is Mg-8Gd-3Y-0.5Zr alloy casting state metallograph under the embodiment 4 normal pressure pressure casting methods.
The specific embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated, present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Embodiment 1:Mg-8Gd-3Y-0.5Zr alloy 6kPa evacuated die-casting process
At first pure magnesium ingot 39.56kg and Mg-90%Gd intermediate alloy 4.44kg, Mg-25%Y intermediate alloy 6kg, Mg-30%Zr intermediate alloy 0.5kg are preheated to 150 ℃～250 ℃; Secondly at SF
6And N
2Mixed gas protectedly down pure magnesium ingot is put into melting furnace, treat the magnesium ingot fusing after, melt temperature is raised to 680 ℃～700 ℃; Then Mg-90%Gd and the Mg-25%Y intermediate alloy of preheating are put into smelting furnace, wait to melt fully after, again temperature is elevated to 740 ℃～760 ℃; Mg-30%Zr is put into smelting furnace, and temperature descends, treat that temperature rises to 740 ℃～760 ℃ again after, do not cut off the power supply and carry out refining, it is mixed, leave standstill, cool to 680 ℃ then, continue insulation, take the scum silica frost on surface off.
Adopt 250 tons of cold house's horizontal plunger die casting machines of Japan that above-mentioned molten metal is carried out die casting, concrete steps are as follows: mould and die preheating to 150 ℃, add above-mentioned 680 ℃ molten metal, and drift is pressed into the low velocity of 200mm/s earlier; When drift marched to 120mm, die casting machine was evacuated to 6kPa, and drift keeps travel condition; When drift marches to 260mm, beginning being pressed at a high speed with 4m/s; When drift marched to 280mm, boost pressure was set at 12MPa, and die casting is finished, and treated metal cooling back taking-up.
Above-mentioned magnesium-rare earth carries out constituent analysis, contains Gd7.97%, Y2.56%, Zr0.29%, and all the other are Mg.Above-mentioned magnesium-rare earth carries out Mechanics Performance Testing, and test result is as follows: tensile strength 249.7MPa; Yield strength 198.9MPa; Percentage elongation 7.61%.Fig. 1 is the alloy casting state metallograph that this embodiment obtains, and as can be seen, under the evacuated die-casting process method, the pore in the foundry goods and shrinkage porosite shrinkage cavity have obvious minimizing from the figure.
Embodiment 2:Mg-8Gd-3Y-0.5Zr alloy 10kPa evacuated die-casting process
At first pure magnesium ingot 39.56kg and Mg-90%Gd intermediate alloy 4.44kg, Mg-25%Y intermediate alloy 6kg, Mg-30%Zr intermediate alloy 0.5kg are preheated to 150 ℃～250 ℃; Secondly at SF
6And N
2Mixed gas protectedly down pure magnesium ingot is put into melting furnace, treat the magnesium ingot fusing after, melt temperature is raised to 680 ℃～700 ℃; Then Mg-90%Gd and the Mg-25%Y intermediate alloy of preheating are put into smelting furnace, wait to melt fully after, again temperature is elevated to 740 ℃～760 ℃; Mg-30%Zr is put into smelting furnace, and temperature descends, treat that temperature rises to 740 ℃～760 ℃ again after, do not cut off the power supply and carry out refining, it is mixed, leave standstill, cool to 700 ℃ then, continue insulation, take the scum silica frost on surface off.
Adopt 250 tons of cold house's horizontal plunger die casting machines of Japan that above-mentioned molten metal is carried out die casting, concrete steps are as follows: mould and die preheating to 150 ℃, add above-mentioned 700 ℃ molten metal, and drift is pressed into the low velocity of 300mm/s earlier; When drift marched to 120mm, die casting machine was evacuated to 10kPa, and drift keeps travel condition; When drift marches to 255mm, beginning being pressed at a high speed with 6m/s; When drift marched to 290mm, boost pressure was set at 13MPa, and die casting is finished, and treated metal cooling back taking-up.
Above-mentioned magnesium-rare earth carries out constituent analysis, contains Gd7.97%, Y2.56%, Zr0.29%, and all the other are Mg.Above-mentioned magnesium-rare earth carries out Mechanics Performance Testing, and test result is as follows: tensile strength 240.4MPa; Yield strength 197.6MPa; Percentage elongation 7.58%.
Embodiment 3:Mg-8Gd-3Y-0.5Zr alloy 15kPa evacuated die-casting process
At first pure magnesium ingot 39.56kg and Mg-90%Gd intermediate alloy 4.44kg, Mg-25%Y intermediate alloy 6kg, Mg-30%Zr intermediate alloy 0.5kg are preheated to 150 ℃～250 ℃; Secondly at SF
6And N
2Mixed gas protectedly down pure magnesium ingot is put into melting furnace, treat the magnesium ingot fusing after, melt temperature is raised to 680 ℃～700 ℃; Then Mg-90%Gd and the Mg-25%Y intermediate alloy of preheating are put into smelting furnace, wait to melt fully after, again temperature is elevated to 740 ℃～760 ℃; Mg-30%Zr is put into smelting furnace, and temperature descends, treat that temperature rises to 740 ℃～760 ℃ again after, do not cut off the power supply and carry out refining, it is mixed, leave standstill, cool to 720 ℃ then, continue insulation, take the scum silica frost on surface off.
Adopt 250 tons of cold house's horizontal plunger die casting machines of Japan that above-mentioned molten metal is carried out die casting, concrete steps are as follows: mould and die preheating to 180 ℃, add above-mentioned 720 ℃ molten metal, and drift is pressed into the low velocity of 300mm/s earlier; When drift marched to 120mm, die casting machine was evacuated to 15kPa, and drift keeps travel condition; When drift marches to 255mm, beginning being pressed at a high speed with 6m/s; When drift marched to 290mm, boost pressure was set at 13MPa, and die casting is finished, and treated metal cooling back taking-up.
Above-mentioned magnesium-rare earth carries out constituent analysis, contains Gd7.97%, Y2.56%, Zr0.29%, and all the other are Mg.Above-mentioned magnesium-rare earth carries out Mechanics Performance Testing, and test result is as follows: tensile strength 239.1MPa; Yield strength 191.1MPa; Percentage elongation 7.14%.
The die casting of embodiment 4:Mg-8Gd-3Y-0.5Zr alloy normal pressure; This embodiment is the comparative example of embodiment 1, and normal pressure is an atmospheric pressure 101.3kPa.
At first pure magnesium ingot 39.56kg and Mg-90%Gd intermediate alloy 4.44kg, Mg-25%Y intermediate alloy 6kg, Mg-30%Zr intermediate alloy 0.5kg are preheated to 150 ℃～250 ℃; Secondly at SF
6And N
2Mixed gas protectedly down pure magnesium ingot is put into melting furnace, treat the magnesium ingot fusing after, melt temperature is raised to 680 ℃～700 ℃; Then Mg-90%Gd and the Mg-25%Y intermediate alloy of preheating are put into smelting furnace, wait to melt fully after, again temperature is elevated to 740 ℃～760 ℃; Mg-30%Zr is put into smelting furnace, and temperature descends, treat that temperature rises to 740 ℃～760 ℃ again after, do not cut off the power supply and carry out refining, it is mixed, leave standstill, cool to 680 ℃ then, continue insulation, take the scum silica frost on surface off.
Adopt 250 tons of cold house's horizontal plunger die casting machines of Japan that above-mentioned molten metal is carried out die casting, concrete steps are as follows: mould and die preheating to 150 ℃, add above-mentioned 680 ℃ molten metal, and drift is pressed into the low velocity of 200mm/s earlier; When drift marches to 260mm, beginning being pressed at a high speed with 4m/s; When drift marched to 280mm, boost pressure was set at 12MPa, and die casting is finished, and treated metal cooling back taking-up.
Above-mentioned magnesium-rare earth carries out constituent analysis, contains Gd7.97%, Y2.56%, Zr0.29%, and all the other are Mg.Above-mentioned magnesium-rare earth carries out Mechanics Performance Testing, and test result is as follows: tensile strength 233.2MPa; Yield strength 185.3MPa; Percentage elongation 4.10%.Fig. 2 is the alloy casting state metallograph that this embodiment obtains, and as can be seen, compared with the foundry goods that the evacuated die-casting process method obtains, pore and shrinkage porosite shrinkage cavity in the normal pressure pressure casting method gained foundry goods are more from the figure.
Embodiment 5:Mg-6Gd-3Y-0.5Zr alloy 6kPa evacuated die-casting process
At first pure magnesium ingot 40.67kg and Mg-90%Gd intermediate alloy 3.33kg, Mg-25%Y intermediate alloy 6kg, Mg-30%Zr intermediate alloy 0.5kg are preheated to 150 ℃～250 ℃; Secondly at SF
6And N
2Mixed gas protectedly down pure magnesium ingot is put into melting furnace, treat the magnesium ingot fusing after, melt temperature is raised to 680 ℃～700 ℃; Then Mg-90%Gd and the Mg-25%Y intermediate alloy of preheating are put into smelting furnace, wait to melt fully after, again temperature is elevated to 740 ℃～760 ℃; Mg-30%Zr is put into smelting furnace, and temperature descends, treat that temperature rises to 740 ℃～760 ℃ again after, do not cut off the power supply and carry out refining, it is mixed, leave standstill, cool to 680 ℃ then, continue insulation, take the scum silica frost on surface off.
Adopt 250 tons of cold house's horizontal plunger die casting machines of Japan that above-mentioned molten metal is carried out die casting, concrete steps are as follows: mould and die preheating to 150 ℃, add above-mentioned 680 ℃ molten metal, and drift is pressed into the low velocity of 200mm/s earlier; When drift marched to 120mm, die casting machine was evacuated to 6kPa, and drift keeps travel condition; When drift marches to 260mm, beginning being pressed at a high speed with 4m/s; When drift marched to 280mm, boost pressure was set at 12MPa, and die casting is finished, and treated metal cooling back taking-up.
Above-mentioned magnesium-rare earth carries out constituent analysis, contains Gd6.30%, Y2.57%, Zr0.90%, and all the other are Mg.Above-mentioned magnesium-rare earth carries out Mechanics Performance Testing, and test result is as follows: tensile strength 249.9MPa; Yield strength 163.8MPa; Percentage elongation 19.50%.
Embodiment 6:Mg-6Gd-3Y-0.5Zr alloy 10kPa evacuated die-casting process
At first pure magnesium ingot 40.67kg and Mg-90%Gd intermediate alloy 3.33kg, Mg-25%Y intermediate alloy 6kg, Mg-30%Zr intermediate alloy 0.5kg are preheated to 150 ℃～250 ℃; Secondly at SF
6And N
2Mixed gas protectedly down pure magnesium ingot is put into melting furnace, treat the magnesium ingot fusing after, melt temperature is raised to 680 ℃～700 ℃; Then Mg-90%Gd and the Mg-25%Y intermediate alloy of preheating are put into smelting furnace, wait to melt fully after, again temperature is elevated to 740 ℃～760 ℃; Mg-30%Zr is put into smelting furnace, and temperature descends, treat that temperature rises to 740 ℃～760 ℃ again after, do not cut off the power supply and carry out refining, it is mixed, leave standstill, cool to 700 ℃ then, continue insulation, take the scum silica frost on surface off.
Adopt 250 tons of cold house's horizontal plunger die casting machines of Japan that above-mentioned molten metal is carried out die casting, concrete steps are as follows: mould and die preheating to 150 ℃, add above-mentioned 700 ℃ molten metal, and drift is pressed into the low velocity of 300mm/s earlier; When drift marched to 120mm, die casting machine was evacuated to 10kPa, and drift keeps travel condition; When drift marches to 255mm, beginning being pressed at a high speed with 6m/s; When drift marched to 290mm, boost pressure was set at 13MPa, and die casting is finished, and treated metal cooling back taking-up.
Above-mentioned magnesium-rare earth carries out constituent analysis, contains Gd6.30%, Y2.57%, Zr0.90%, and all the other are Mg.Above-mentioned magnesium-rare earth carries out Mechanics Performance Testing, and test result is as follows: tensile strength 248.2MPa; Yield strength 161.0MPa; Percentage elongation 17.54%.
Embodiment 7:Mg-6Gd-3Y-0.5Zr alloy 15kPa evacuated die-casting process
At first pure magnesium ingot 40.67kg and Mg-90%Gd intermediate alloy 3.33kg, Mg-25%Y intermediate alloy 6kg, Mg-30%Zr intermediate alloy 0.5kg are preheated to 150 ℃～250 ℃; Secondly at SF
6And N
2Mixed gas protectedly down pure magnesium ingot is put into melting furnace, treat the magnesium ingot fusing after, melt temperature is raised to 680 ℃～700 ℃; Then Mg-90%Gd and the Mg-25%Y intermediate alloy of preheating are put into smelting furnace, wait to melt fully after, again temperature is elevated to 740 ℃～760 ℃; Mg-30%Zr is put into smelting furnace, and temperature descends, treat that temperature rises to 740 ℃～760 ℃ again after, do not cut off the power supply and carry out refining, it is mixed, leave standstill, cool to 720 ℃ then, continue insulation, take the scum silica frost on surface off.
Adopt 250 tons of cold house's horizontal plunger die casting machines of Japan that above-mentioned molten metal is carried out die casting, concrete steps are as follows: mould and die preheating to 180 ℃, add above-mentioned 720 ℃ molten metal, and drift is pressed into the low velocity of 300mm/s earlier; When drift marched to 120mm, die casting machine was evacuated to 15kPa, and drift keeps travel condition; When drift marches to 255mm, beginning being pressed at a high speed with 6m/s; When drift marched to 290mm, boost pressure was set at 13MPa, and die casting is finished, and treated metal cooling back taking-up.
Above-mentioned magnesium-rare earth carries out constituent analysis, contains Gd6.30%, Y2.57%, Zr0.90%, and all the other are Mg.Above-mentioned magnesium-rare earth carries out Mechanics Performance Testing, and test result is as follows: tensile strength 228.1MPa; Yield strength 159.5MPa; Percentage elongation 12.84%.
The die casting of embodiment 8:Mg-6Gd-3Y-0.5Zr alloy normal pressure; This embodiment is the comparative example of embodiment 5, and normal pressure refers to atmospheric pressure, i.e. a 101.3kPa.
At first pure magnesium ingot 40.67kg and Mg-90%Gd intermediate alloy 3.33kg, Mg-25%Y intermediate alloy 6kg, Mg-30%Zr intermediate alloy 0.5kg are preheated to 150 ℃～250 ℃; Secondly at SF
6And N
2Mixed gas protectedly down pure magnesium ingot is put into melting furnace, treat the magnesium ingot fusing after, melt temperature is raised to 680 ℃～700 ℃; Then Mg-90%Gd and the Mg-25%Y intermediate alloy of preheating are put into smelting furnace, wait to melt fully after, again temperature is elevated to 740 ℃～760 ℃; Mg-30%Zr is put into smelting furnace, and temperature descends, treat that temperature rises to 740 ℃～760 ℃ again after, do not cut off the power supply and carry out refining, it is mixed, leave standstill, cool to 680 ℃ then, continue insulation, take the scum silica frost on surface off.
Adopt 250 tons of cold house's horizontal plunger die casting machines of Japan that above-mentioned molten metal is carried out die casting, concrete steps are as follows: mould and die preheating to 150 ℃, add above-mentioned 680 ℃ molten metal, and drift is pressed into the low velocity of 200mm/s earlier; When drift marches to 255mm, beginning being pressed at a high speed with 4m/s; When drift marched to 290mm, boost pressure was set at 12MPa, and die casting is finished, and treated metal cooling back taking-up.
Above-mentioned magnesium-rare earth carries out constituent analysis, contains Gd6.30%, Y2.57%, Zr0.90%, and all the other are Mg.Above-mentioned magnesium-rare earth carries out Mechanics Performance Testing, and test result is as follows: tensile strength 221.5MPa; Yield strength 158.3MPa; Percentage elongation 7.71%.
More than describe preferred embodiment of the present invention in detail.The ordinary skill that should be appreciated that this area need not creative work and just can design according to the present invention make many modifications and variations.Therefore, all technical staff in the art all should be in the determined protection domain by claims under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (4)
1. the evacuated die-casting process method of a magnesium-rare earth is characterized in that, may further comprise the steps:
Step 1, pure magnesium ingot and magnesium-rare earth intermediate alloy mixed melting is formed the magnesium-rare earth molten metal, with described molten metal 680～720 ℃ of insulations;
Step 2, with the die casting in die casting machine of above-mentioned magnesium-rare earth molten metal, the die casting parameter arranges as follows: low speed speed is 0.2～0.3m/s, high speed speed is 4～6m/s, high low speed dislocation is 255～260mm; Vacuumize position 120mm, vacuum is 5～15kPa; Pressurization position is 280～290mm, and boost pressure is 12～13MPa.
2. the evacuated die-casting process method of a kind of magnesium-rare earth described in claim 1 is characterized in that, described die casting machine adopts 250 tons of cold house's horizontal plunger die casting machines of Japan.
3. the evacuated die-casting process method of a kind of magnesium-rare earth described in claim 1 is characterized in that, described magnesium-rare earth molten metal is Mg-8Gd-3Y-0.5Zr or Mg-6Gd-3Y-0.5Zr.
4. the evacuated die-casting process method of a kind of magnesium-rare earth described in claim 1 is characterized in that, whole fusing and press casting procedure, and described magnesium-rare earth molten metal is by SF
6And N
2Mixed gas protected.
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| CN108311658A (en) * | 2018-02-08 | 2018-07-24 | 山东弗泽瑞金属科技有限公司 | Vacuum low speed pressure casting method |
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| CN108213381A (en) * | 2018-01-22 | 2018-06-29 | 广德盛源电器有限公司 | A kind of Al-alloy parts die casting machine |
| CN108311658A (en) * | 2018-02-08 | 2018-07-24 | 山东弗泽瑞金属科技有限公司 | Vacuum low speed pressure casting method |
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