CN114472841B - Die-casting aluminum alloy, preparation method thereof and rotor end cover precursor - Google Patents
Die-casting aluminum alloy, preparation method thereof and rotor end cover precursor Download PDFInfo
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- CN114472841B CN114472841B CN202210081845.2A CN202210081845A CN114472841B CN 114472841 B CN114472841 B CN 114472841B CN 202210081845 A CN202210081845 A CN 202210081845A CN 114472841 B CN114472841 B CN 114472841B
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- 238000004512 die casting Methods 0.000 title claims abstract description 215
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 172
- 239000002243 precursor Substances 0.000 title claims abstract description 58
- 238000002360 preparation method Methods 0.000 title claims abstract description 30
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 123
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 123
- 239000007788 liquid Substances 0.000 claims abstract description 109
- 239000000956 alloy Substances 0.000 claims abstract description 71
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 66
- 238000004321 preservation Methods 0.000 claims abstract description 30
- 238000010438 heat treatment Methods 0.000 claims abstract description 21
- 238000002844 melting Methods 0.000 claims abstract description 18
- 230000008018 melting Effects 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000010791 quenching Methods 0.000 claims abstract description 13
- 230000000171 quenching effect Effects 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims description 18
- 229910052749 magnesium Inorganic materials 0.000 claims description 13
- 239000002893 slag Substances 0.000 claims description 11
- 230000001502 supplementing effect Effects 0.000 claims description 9
- 239000012535 impurity Substances 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 4
- 239000011777 magnesium Substances 0.000 description 29
- 230000017525 heat dissipation Effects 0.000 description 19
- 230000000694 effects Effects 0.000 description 16
- 238000005266 casting Methods 0.000 description 15
- 230000008569 process Effects 0.000 description 13
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- 239000002245 particle Substances 0.000 description 8
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- 238000001816 cooling Methods 0.000 description 6
- 238000007670 refining Methods 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 4
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- 238000005265 energy consumption Methods 0.000 description 3
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- 229910019018 Mg 2 Si Inorganic materials 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
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- 206010063385 Intellectualisation Diseases 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
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- 229910052742 iron Inorganic materials 0.000 description 1
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- 229910052745 lead Inorganic materials 0.000 description 1
- 239000003562 lightweight material Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
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- 230000006855 networking Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
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Classifications
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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
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon 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 application provides a die-casting aluminum alloy, a preparation method thereof and a rotor end cover precursor. The preparation method of the die-casting aluminum alloy comprises the following steps: carrying out mixed melting operation on the aluminum alloy raw materials to obtain alloy aluminum liquid; purifying the alloy aluminum liquid to obtain a pre-cast aluminum liquid; carrying out primary preheating and heat preservation operation on the die-casting mould; conveying the pre-cast aluminum liquid to a die casting machine for die casting operation to obtain an aluminum alloy die casting; performing die casting water quenching operation on the aluminum alloy die casting to obtain a die casting aluminum alloy; and carrying out heat treatment operation on the die-casting aluminum alloy. The preparation method of the die-casting aluminum alloy can effectively improve the yield strength and the tensile strength of the die-casting aluminum alloy.
Description
Technical Field
The invention relates to the technical field of aluminum alloy, in particular to die-casting aluminum alloy, a preparation method thereof and a rotor end cover precursor.
Background
The automotive industry is now in a new era of global revolution: the global automobile industry enters the greatly-changed times of development of dynamism, low carbonization, light weight, intellectualization, networking and sharing, the countries have stringent regulatory requirements, and new situations have great impact and challenges on the global automobile industry and also have great development opportunities. Various riding-on-the-fly fuel vehicles are replaced by new energy vehicles such as lightweight electric vehicles and the like, the core foundation of the weight reduction is materials, at present, the lightweight materials of automobiles basically use aluminum alloy to replace steel, more importantly, the mass production process of rotor end cover precursors is met, the non-die-casting aluminum alloy is a main object of a large number of scientific and technical staff researches, and from the viewpoints of cost and acquisition easiness of materials, if the requirements of mechanical properties of products can be met through process improvement from the materials with the existing standard specifications, the novel materials are more practical and easy to accept than the development of a brand new material specification, and in this case, the U.S. automobile huge head hopes that the yield strength and the tensile strength of the A380 die-casting aluminum alloy are improved by about 50% compared with the standard values.
However, the existing die-casting aluminum alloy has poor yield strength and tensile strength, and cannot meet the requirements for automobile product parts which are required to be high in safety and light in weight.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a die-casting aluminum alloy capable of improving yield strength and tensile strength, a preparation method thereof and a rotor end cover precursor.
The aim of the invention is realized by the following technical scheme:
A die-casting aluminum alloy, a preparation method thereof and a rotor end cover precursor, wherein the rotor end cover precursor comprises the die-casting aluminum alloy;
the preparation method of the die-casting aluminum alloy comprises the following steps:
Carrying out mixed melting operation on the aluminum alloy raw materials to obtain alloy aluminum liquid;
The alloy aluminum liquid is purified, and the density of the alloy aluminum liquid can be effectively improved by purifying the melted alloy aluminum liquid, so that the density of the alloy aluminum liquid is ensured to be more than 2.68g/cm < 3 >, and the alloy aluminum liquid has higher yield strength and tensile strength after the die-casting aluminum alloy is formed, and the pre-cast aluminum liquid is obtained;
Carrying out primary preheating and heat preservation operation on the die-casting mould;
Conveying the pre-cast aluminum liquid to a die casting machine for die casting operation to obtain an aluminum alloy die casting;
Performing die casting water quenching operation on the aluminum alloy die casting to obtain a die casting aluminum alloy;
Performing heat treatment operation on the die-casting aluminum alloy;
After the step of mixing and melting the aluminum alloy raw materials to obtain alloy aluminum liquid and before the step of purifying the alloy aluminum liquid to obtain pre-cast aluminum liquid, the preparation method of the die-casting aluminum alloy further comprises the following steps:
carrying out slag skimming treatment operation on the alloy aluminum liquid;
The temperature in the first preheating and heat preserving operation is 200-220 ℃;
After the step of preheating and preserving heat of the die casting mold and before the step of conveying the pre-cast aluminum liquid to a die casting machine for die casting operation to obtain an aluminum alloy die casting, the preparation method of the die casting aluminum alloy further comprises the following steps:
carrying out secondary preheating and heat preservation operation on the trough of the die casting machine; the temperature in the second preheating and heat preserving operation is 180-200 ℃;
The die-casting aluminum alloy comprises the following components in parts by weight:
the balance of Al, and the impurity is controlled below 0.5 part;
After the step of mixing and melting the aluminum alloy raw materials to obtain alloy aluminum liquid and before the step of purifying the alloy aluminum liquid to obtain pre-cast aluminum liquid, the preparation method of the die-casting aluminum alloy further comprises the following steps:
performing Mg and Ti element supplementing operation on the alloy aluminum liquid;
the supplementing amount of the Mg element is 0.4 to 0.5 part, and the supplementing amount of the Ti element is 0.1 to 0.2 part;
The rotor end cover precursor comprises a base and a wheel frame, wherein the wheel frame is connected to one surface of the base, the wheel frame comprises an outer connecting ring, spokes and an inner connecting disc, the outer connecting ring is connected with the inner connecting disc through the spokes, the number of the spokes is multiple, each spoke is respectively connected with the outer connecting ring and the inner connecting disc, a plurality of the spokes are symmetrical about the inner connecting disc in a central axis manner, a heat dissipation groove is formed between every two spokes, a weight reduction cavity is formed in the other surface of the base, and the base and the wheel frame are formed by die casting of die casting aluminum alloy; the outer connecting ring is connected with the outer shell, and the outer connecting ring is connected with the inner connecting disc through spokes, so that the rotor end cover precursor can be reinforced through the spokes, and the structural strength of the rotor end cover precursor is improved; the spokes comprise a plurality of spokes, each spoke is respectively connected with the outer connecting ring and the inner connecting disc, and the spokes are symmetrical about the central axis of the inner connecting disc, so that the structural strength of the precursor of the rotor end cover is enhanced, and the structural stability of the precursor of the rotor end cover is improved; a heat dissipation groove is formed between every two spokes; the base and the wheel frame are formed by die casting of die casting aluminum alloy.
Compared with the prior art, the invention has at least the following advantages:
1. In the preparation method of the die-casting aluminum alloy, the density of the molten alloy aluminum liquid can be effectively improved by purifying the molten alloy aluminum liquid, so that the alloy aluminum liquid has higher yield strength and tensile strength after the die-casting aluminum alloy is formed.
2. In the preparation method of the die-casting aluminum alloy, the aluminum alloy liquid has higher density after purification treatment, and further, the die-casting mold is subjected to primary preheating and heat preservation operation, so that the die-casting mold is heated to a preset temperature, the temperature stability is kept in the die-casting process, and meanwhile, the trough of the die-casting machine achieves the effect of preheating and heat preservation, thereby effectively controlling the pre-crystallization of the aluminum liquid, enhancing refined crystal particles, improving the uniformity of crystal grains, reducing or eliminating the problem of stress concentration in an aluminum alloy material, further improving the yield strength and the tensile strength of the die-casting aluminum alloy, and meeting the requirements of new energy electric vehicles for manufacturing high-strength parts.
3. In the preparation method of the die-casting aluminum alloy, the die-casting water quenching operation is carried out on the aluminum alloy die-casting part, so that the stress of the aluminum alloy die-casting part can be eliminated in a short period, and the yield strength and the tensile strength of the die-casting aluminum alloy are improved, and meanwhile, the stability of high yield strength and high tensile strength is further ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method of preparing a die cast aluminum alloy according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of a rotor end cap precursor processed from the die cast aluminum alloy of FIG. 1;
FIG. 3 is a schematic view of a rotor end cap precursor of FIG. 2 from another perspective;
fig. 4 is a schematic structural view of the rotor end cap precursor of fig. 2 from another perspective.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. The drawings illustrate preferred embodiments of the invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The application provides a preparation method of die-casting aluminum alloy, which comprises the following steps: carrying out mixed melting operation on the aluminum alloy raw materials to obtain alloy aluminum liquid; purifying the alloy aluminum liquid to obtain a pre-cast aluminum liquid; carrying out primary preheating and heat preservation operation on the die-casting mould; conveying the pre-cast aluminum liquid to a die casting machine for die casting operation to obtain an aluminum alloy die casting; performing die casting water quenching operation on the aluminum alloy die casting to obtain a die casting aluminum alloy; and performing heat treatment operation on the die-casting aluminum alloy.
In the preparation method of the die-casting aluminum alloy, the density of the molten alloy aluminum liquid can be effectively improved by purifying the molten alloy aluminum liquid, so that the alloy aluminum liquid has higher yield strength and tensile strength after the die-casting aluminum alloy is formed. After the alloy aluminum liquid is purified, the alloy aluminum liquid has higher density, and further, the die casting mould is subjected to the first preheating and heat preservation operation, so that the die casting mould is heated to a preset temperature, the temperature stability is kept in the die casting process, and meanwhile, the trough of the die casting machine achieves the preheating and heat preservation effect, so that the pre-crystallization of the aluminum liquid is effectively controlled, the grain refinement crystallization particles are enhanced, the uniformity of grains is improved, the problem of stress concentration in an aluminum alloy material is reduced or eliminated, the yield strength and the tensile strength of the die casting aluminum alloy are further improved, and the requirement of a new energy electric automobile for manufacturing high-strength parts can be met. Furthermore, the stress of the aluminum alloy die casting can be eliminated in a short period by performing die casting water quenching operation on the aluminum alloy die casting, so that the yield strength and the tensile strength of the die casting aluminum alloy are improved, and meanwhile, the stability of high yield strength and high tensile strength is further ensured.
Referring to fig. 1, in order to better understand the preparation method of the die-cast aluminum alloy of the present application, the preparation method of the die-cast aluminum alloy of the present application is further explained below, and the preparation method of the die-cast aluminum alloy of an embodiment includes the following steps:
S100, carrying out mixed melting operation on the aluminum alloy raw materials to obtain alloy aluminum liquid.
In the embodiment, aluminum ingots meeting the chemical component requirements, namely aluminum alloy raw materials are prepared, and special melting furnaces or industrial frequency furnaces are adopted for melting aluminum liquid to obtain the alloy aluminum liquid with better uniformity.
And S200, purifying the alloy aluminum liquid to obtain the pre-cast aluminum liquid.
In the embodiment, the density of the molten alloy aluminum liquid can be effectively improved by purifying the molten alloy aluminum liquid, and the density of the alloy aluminum liquid is ensured to be more than 2.68g/cm 3, so that the alloy aluminum liquid has higher yield strength and tensile strength after the die-casting aluminum alloy is formed.
S300, performing primary preheating and heat preservation operation on the die-casting mould.
It can be understood that the alloy aluminum liquid has higher density after purification treatment, but the alloy aluminum liquid with high density has quicker heat dissipation and poorer heat preservation effect, and the phase of the alloy aluminum liquid needs a certain time to the die casting process, thus being unfavorable for the die casting of the aluminum alloy. In order to enable the high-density alloy molten aluminum to achieve a better die-casting effect, in the embodiment, before die-casting production is started, a die casting die is subjected to primary preheating and heat preservation operation, a die temperature machine is used for stabilizing the temperature of a die, meanwhile, a material tank of the die casting machine is subjected to preheating and heat preservation through the die temperature machine, the die casting die is heated to a preset temperature, temperature stability is kept in the die-casting process, and meanwhile, the material tank of the die casting machine achieves the effect of preheating and heat preservation, so that the pre-crystallization of the molten aluminum is effectively controlled, refined crystal particles are enhanced, the uniformity of grains is improved, the yield strength and the tensile strength of the die-casting aluminum alloy are further improved, and the requirement of a new energy electric automobile for manufacturing high-strength parts can be met.
S400, conveying the pre-cast aluminum liquid to a die casting machine for die casting operation, and obtaining the aluminum alloy die casting.
In this embodiment, the pre-cast aluminum liquid is conveyed to a die casting machine for die casting operation, that is, the pre-cast aluminum liquid is injected into a die of the die casting machine and then subjected to die casting molding, thereby obtaining an aluminum alloy die casting.
S500, performing die casting water quenching operation on the aluminum alloy die casting to obtain the die casting aluminum alloy.
It is understood that quenching is a heat treatment process in which the workpiece is heated above a critical temperature, held for a period of time, and then cooled at a rate greater than the critical cooling rate to obtain an unbalanced structure predominantly martensite (and also bainite or single-phase austenite, as desired). However, the existing die-casting workpiece castings are easy to have the condition that the grains are coarser and uneven, so that the castings have manufacturing defects. In order to strengthen refined crystal particles and improve compactness of a casting structure, in the embodiment, a die casting is quickly taken out from a die after die casting is finished, is put into water for quenching for 10 seconds in 6S and is taken out for air cooling, the water temperature is controlled at 40-50 ℃ through a refrigerator, so that the grain structure in the casting can be thinned, the problem that grain growth becomes coarse in the casting after die casting is prevented, the compactness of the casting structure is improved, and further the yield strength and tensile strength of die casting aluminum alloy are improved.
S600, performing heat treatment operation on the die-casting aluminum alloy.
It can be understood that after die casting is completed, the die casting is rapidly taken out from the die, is put into water for quenching for 10 seconds in 6 seconds, is taken out for air cooling, the water temperature is controlled at 40-50 ℃ by a refrigerator, the casting is quenched, and the strengthening component is maximally dissolved in the alloy and is fixedly stored to the room temperature, so that the die casting aluminum alloy is obtained. However, the die-cast aluminum alloy after quenching is liable to have a situation that part of stress is not completely eliminated, thereby affecting the yield strength and tensile strength of the die-cast aluminum alloy. In order to further eliminate the stress existing in the die-casting aluminum alloy, in the embodiment, the heat treatment operation is carried out on the die-casting aluminum alloy, the quenched aluminum alloy casting is heated to a certain temperature, the die-casting aluminum alloy casting is discharged and cooled to room temperature after a certain period of time, the supersaturated solid solution is decomposed, and the alloy matrix structure is stabilized, so that the stress existing in the die-casting aluminum alloy is further eliminated, and the stability of the die-casting aluminum alloy is improved.
In one embodiment, after the step of performing a mixed melting operation on the aluminum alloy raw material to obtain an alloy aluminum liquid and before the step of performing a purifying operation on the alloy aluminum liquid to obtain a pre-cast aluminum liquid, the method for producing a die-cast aluminum alloy further comprises the steps of: and carrying out slag skimming treatment operation on the alloy aluminum liquid. It can be understood that in the smelting process of the aluminum alloy, as the slag amount increases, the melting loss of aluminum also increases, the slag floating on the surface of the melt after refining has better wettability with the melt, the wetting angle is smaller than 90 degrees, a considerable amount of melt is mixed in the slag, and the part of melt is dispersed in the slag in a granular shape and is adhered with the slag. In order to reduce the melting loss of aluminum, in this embodiment, the wettability of dross and aluminum liquid is changed by adding a refining agent, the surface tension on the interface between the dross and aluminum is increased to separate the dross from aluminum, and then the aluminum dross is scraped out of the door opening by a large rake, so that the aluminum dross is effectively removed, the melting loss of aluminum is reduced, and the aluminum liquid is prevented from being carried out.
In one embodiment, the temperature in the first preheating hold operation is from 200 ℃ to 220 ℃. It can be understood that the pre-crystallization of the aluminum liquid can be effectively controlled, the refined crystallization particles can be enhanced, the uniformity of the crystal grains can be improved, the yield strength and the tensile strength of the die-casting aluminum alloy can be further improved, and the requirement of the new energy electric automobile for manufacturing high-strength parts can be met by performing the first pre-heating and heat preservation operation on the die-casting die. However, if the temperature in the first preheating and heat preserving operation is too high, excessive energy consumption is easy to be caused, and the precrystallization of the aluminothermic process is not easy to be controlled; if the temperature in the first preheating and heat preserving operation is too low, the preheating effect cannot be achieved. In order to improve the stability of the first preheating and heat preserving operation, in this embodiment, after the alloy aluminum liquid prepared according to the components is mixed to carry out degassing and aluminum water purifying, during die casting, the die casting mold is preheated to 200-220 ℃, and the temperature of the mold is stabilized by using a mold temperature machine, so that the stability of the first preheating and heat preserving operation is improved, and the pre-crystallization of the aluminum liquid is better controlled.
In one embodiment, after the step of preheating and insulating the die-casting mold and before the step of conveying the pre-cast aluminum liquid to the die-casting machine for die-casting operation, the method for preparing the die-cast aluminum alloy die-casting further comprises the following steps: and carrying out secondary preheating and heat preservation operation on the trough of the die casting machine. In this embodiment, carry out the secondary through the mould temperature machine with the die casting machine silo and preheat the heat preservation, make the die casting machine silo heat to preset temperature to keep temperature stability in the die casting process, make the die casting machine silo reach simultaneously and preheat the heat preservation effect, thereby control the crystallization in advance of aluminium liquid effectively, strengthen and refine the crystallization granule, improve the grain homogeneity, and then improve die casting aluminium alloy's yield strength and tensile strength, can satisfy the requirement that new forms of energy electric automobile was used for making high strength part.
Further, the temperature in the second preheating and heat preserving operation is 180-200 ℃. It can be understood that if the temperature in the second preheating and heat preserving operation is too high, excessive energy consumption is easily caused, and the pre-crystallization of the aluminum liquid is not easily controlled; if the temperature in the second preheating and heat preserving operation is too low, the preheating effect of the molten aluminum in the trough of the die casting machine cannot be achieved. In order to improve the stability of the second preheating and heat preserving operation, in the embodiment, after the alloy aluminum liquid prepared according to the components is mixed for degassing and purifying aluminum water, a die casting mold is preheated to 180-200 ℃ during die casting, a die temperature machine is used for stabilizing the temperature of a die, and meanwhile, a die casting machine trough is preheated and preserved at 180-200 ℃ through the die temperature machine, so that the stability of the second preheating and heat preserving operation is improved, the aluminum liquid has better stability in the die casting machine trough, and the method is beneficial to enhancing refined crystal particles and improving the yield strength and tensile strength of the die casting aluminum alloy.
In one embodiment, the die-casting aluminum alloy comprises the following components in parts by weight: 7.8 to 9.2 parts of Si, 0.7 to 0.9 part of Fe, 3.2 to 3.6 parts of Cu, 0 to 0.5 part of Mn, 0.4 to 0.5 part of Mg,0 to 0.5 part of Ni, 0.6 to 1.2 parts of Zn, 0.1 to 0.2 part of Ti, 0 to 0.1 part of Pb and 0 to 0.35 part of Sn; the balance being Al, and the impurity content is controlled below 0.5 part. It can be understood that the content of each element in the existing A380 die casting aluminum alloy material is as follows: 7.5 to 9.5 percent of Si, 0 to 1.3 percent of Fe, 3.0 to 4.0 percent of Cu, 0 to 0.5 percent of Mn, 0 to 0.3 percent of Mg,0 to 0.5 percent of Ni, 0 to 3 percent of Zn, 0 to 0.1 percent of Pb and 0 to 0.35 percent of Sn, the impurity is controlled below 0.5 percent, and the balance is Al. However, the tolerance ranges of the above components are too large, and the different ranges affect each other, so that the high safety and the light weight of the precursor of the new energy rotor end cover cannot be satisfied. In the embodiment, fe, cu, mg and Ti are main elements influencing the strength of the die-cast aluminum alloy material, firstly, 0.4 to 0.5 part of Mg element and 0.1 to 0.2 part of Ti element are added to improve the content of Mg and Ti in the die-cast aluminum alloy, so that the content of Zn element in the aluminum alloy can be reduced to be as low as 0.6 part, the strength of the aluminum alloy is easily reduced due to the fact that the content of Zn element in the aluminum alloy is too high, and the yield strength and tensile strength of the die-cast aluminum alloy can be effectively improved by improving the content of Mg and Ti in the die-cast aluminum alloy to reduce the content of Zn element in the aluminum alloy; Further, although the strength of the aluminum alloy can be enhanced by increasing the addition amount of the Mg element, the problem of reducing the fluidity of the aluminum alloy is easy to occur, and the problem of local solidification of the aluminum alloy caused by the large heat loss due to the slow fluidity is easy to occur, so that the stress during die casting is increased, and the yield strength and the tensile strength of the aluminum alloy are reduced. In the application, the addition amount of Mg element and the addition amount of Ti element are improved, and the Ti element can play a role in modifying and refining in the alloy aluminum liquid, so that the crystal particles in the aluminum liquid can be refined, and become fine and uniform, thereby improving the fluidity of the alloy aluminum liquid, effectively reducing the stress caused by uneven crystal grains, being beneficial to die casting of the aluminum alloy and improving the yield strength and tensile strength of the aluminum alloy. Note that, the present application is not limited to the above-described embodiments. When the relative mass of magnesium is too low, for example, less than 0.4 parts by mass, the yield strength of the heat conductive layer cannot be sufficiently ensured to satisfy the requirements, however, when the relative mass of magnesium is too high, for example, more than 0.5 parts by mass, the ductility and heat conductive properties of the aluminum alloy are rapidly lowered. Furthermore, the Si element can form Mg 2 Si phase with the Mg element, and particularly a large amount of Mg 2 Si reinforced phase is formed after heat treatment, so that the mechanical properties of the aluminum alloy, such as yield strength and tensile strength, are effectively improved. when the aluminum alloy contains 0 to 0.1 parts of Pb, the tensile strength of the die-cast aluminum alloy can be further improved, and thus, breakage due to excessive pressing and pulling stress can be prevented when the aluminum alloy is cast and punched into aluminum alloy fins, i.e., a sheet structure.
In one embodiment, after the step of performing a mixed melting operation on the aluminum alloy raw material to obtain an alloy aluminum liquid and before the step of performing a purifying operation on the alloy aluminum liquid to obtain a pre-cast aluminum liquid, the method for producing a die-cast aluminum alloy further comprises the steps of: and (5) performing Mg and Ti element supplementing operation on the alloy aluminum liquid. In the alloy aluminum liquid, because Mg and Ti elements belong to vulnerable elements, the two elements need to be added and supplemented. In the embodiment, the alloy aluminum liquid is subjected to Mg and Ti element supplementing operation, the supplementing amount is added according to the upper limit of a control standard, namely, the Mg is treated according to the content of 0.5 percent by mass, the Ti is treated according to the content of 0.2 percent by mass, the adding amount is calculated, the modifier Al-Ti-B with calculated weight is added in advance into a transfer ladle for preheating for 20 minutes, the Al-Ti-B is ensured to be in a molten state, at the moment, the aluminum water of a large furnace is transferred to the transfer ladle, the calculated magnesium block amount is added, the aluminum liquid is subjected to argon rotary refining degassing, and the density of the aluminum water is ensured to be more than 2.68g/cm 3.
Further, the supplemental amount of Mg element is 0.4 to 0.5 part, and the supplemental amount of Ti element is 0.1 to 0.2 part. In the embodiment, the density of the aluminum water reaches more than 2.68g/cm 3, and meanwhile, the chemical composition of magnesium is controlled to be 0.4-0.5 part, and the composition of Ti is controlled to be 0.1-0.2 part, so that the yield strength and tensile strength of the aluminum alloy are further improved, and the die casting stability of the aluminum alloy is ensured. Further, the clean air machine side furnace is preheated to 850 ℃, and then the treated qualified aluminum liquid is transferred to the die casting machine side furnace, so that the temperature of the aluminum liquid is ensured to be stabilized at 670-685 ℃, the stability of the aluminum liquid before die casting is improved, and the stress of the aluminum liquid due to local cooling solidification is reduced.
In one embodiment, the heat treatment is carried out at 191-193 deg.C for 4-6 hr. It can be understood that the heat treatment operation is carried out on the die-casting aluminum alloy, the quenched aluminum alloy casting is heated to a certain temperature, the aluminum alloy casting is discharged and cooled to room temperature after heat preservation for a certain time, the supersaturated solid solution is decomposed, and the structure of the alloy matrix is stabilized, so that the stress existing in the die-casting aluminum alloy is further eliminated, and the stability of the die-casting aluminum alloy is improved. However, if the heat preservation temperature in the heat treatment operation is too high, the heat preservation time is too long, so that excessive energy consumption is easy to cause, the preparation efficiency of the die-casting aluminum alloy is reduced, and if the temperature is too high, the mechanical property of the die-casting aluminum alloy is also reduced due to too long time; if the heat preservation temperature in the heat treatment operation is too low and the heat preservation time is too low, the stress existing in the die-casting aluminum alloy cannot be effectively eliminated, so that the mechanical property of the die-casting aluminum alloy is poor. In order to further eliminate the stress existing in the die-casting aluminum alloy and maintain the performance stability of the die-casting, in the embodiment, the heat preservation temperature in the heat treatment operation is 191-193 ℃ and the heat preservation time is 4-6 hours, and the die-casting aluminum alloy is taken out for air cooling after the heat treatment is completed, so that the stress existing in the die-casting aluminum alloy is further eliminated and the performance stability of the die-casting is maintained.
Specific examples are set forth below, and all references to percentages are by weight. It should be noted that the following examples are not exhaustive of all possible scenarios, and that the materials used in the examples described below are commercially available unless otherwise specified.
Example 1
The high-strength die-casting aluminum alloy comprises the following components in parts by weight:
The chemical components are as follows: 8.52% of Si, 0.99% of Fe, 3.54% of Cu, 0.152% of Mn, 0.41% of Mg, 0.075% of Ni, 0.804% of Zn, 0.122% of Ti, 0.05% of Pb, 0.20% of Sn, 0-0.5% of impurities and the balance of Al.
The preparation method of the high-strength die-casting aluminum alloy comprises the following steps:
S1, smelting: various raw materials are put into a common centralized dissolving furnace or a power frequency furnace to be melted into aluminum liquid, the heating temperature of the aluminum liquid reaches 730 ℃ to 750 ℃, common slag forming agent (the dosage proportion is 2 kg/T) is used for slag forming and slag skimming treatment, and chemical component detection is carried out by sampling, and the chemical component results are obtained: 8.41% of Si, 0.95% of Fe, 3.53% of Cu, 0.159% of Mn, 0.148% of Mg, 0.068% of Ni, 0.82% of Zn, 0.047% of Ti, 0.045% of Pb, 0.203% of Sn, 0-0.5% of impurities and the balance of Al.
S2, taking 420kg of aluminum liquid for treatment: firstly, adding modifier AlTiB (AlTiB) into an aluminum liquid transfer ladle (according to the measured Ti content in the aluminum liquid of 0.047%, calculating the addition amount of AlTiB (modifier with 5% Ti content in AlTiB), namely 420 (0.24% -0.047%)/5% = 16.21 kg), and preheating for 20 minutes to ensure that the AlTiB is in a molten state; adding the aluminum liquid obtained in the step S1 into a transfer ladle, adding 1.69kg of pure Mg blocks into the treated aluminum liquid according to the amount of 0.55% of Mg, and performing calculation: 420 (0.55% -0.148%) =1.69 kg, (because Mg, ti element belongs to vulnerable elements, the two elements need to be added and supplemented, so the weight percentage content of the two elements is that Mg is added according to the upper limit of 0.50-0.6%, ti is added according to the upper limit of 0.2-0.3%, mg is added according to the upper limit of 0.55% in this experiment, ti is added according to 0.24%), the aluminum liquid is subjected to argon rotary refining degassing, the density of the aluminum liquid is ensured to be more than 2.6g/cm < 3 >, the Mg component is controlled to be 0.4-0.5%, and the Ti component is controlled to be 0.1-0.2%;
S3, emptying a side furnace of the die casting machine in advance, heating the interior of the furnace to 850-900 ℃, transferring the aluminum liquid treated in the step S2 to the side furnace of the die casting machine, and adjusting the temperature of the aluminum liquid in the side furnace to be stabilized at 670-685 ℃;
S4, preheating a die casting mold to 200-220 ℃, stabilizing the temperature of the die by using a die temperature machine, taking out a die casting piece after die casting, putting the die casting piece into fire for quenching in 6S, and controlling the water temperature to 40-50 ℃;
s5, heat treatment: placing the die casting into a heat treatment furnace for heat treatment, wherein the heat preservation temperature is 188-192 ℃ (the heating time is 30 minutes, and then the temperature is kept at the constant temperature of 188-192 ℃), and the heat preservation time is 5 hours;
S6, taking out the die casting and cooling the die casting in the air at normal temperature.
Experimental data:
Example 2
The chemical components are as follows: 7.99% of Si, 0.81% of Fe, 3.6% of Cu, 0.159% of Mn, 0.43% of Mg, 0.05% of Ni, 0.734% of Zn, 0.145% of Ti, 0.046% of Pb0.21% of Sn, 0-0.5% of impurities and the balance of Al.
The experimental procedure is the same as in example 1;
Experimental data:
Example 3
The chemical components are as follows: the chemical components are as follows: 8.21% of Si, 0.787% of Fe, 3.64% of Cu, 0.155% of Mn, 0.382% of Mg, 0.051% of Ni, 0.723% of Zn, 0.129% of Ti, 0.041% of Pb, 0.22% of Sn, 0-0.5% of impurities and the balance of Al.
The experimental procedure is the same as in example 1;
Experimental data:
In conclusion, the yield strength of the high-strength die-casting aluminum alloy manufactured by the technical scheme reaches 240Mpa, the tensile strength reaches more than 300Mpa, the requirements of mechanical properties of products can be met, and the requirements of new energy electric vehicles for manufacturing high-strength parts can be met.
The application also provides a die-casting aluminum alloy, which is prepared by the preparation method of the die-casting aluminum alloy in any embodiment.
Referring to fig. 1, the present application further provides a rotor end cover precursor 10, where the rotor end cover precursor 10 includes the die-casting aluminum alloy described in the foregoing embodiment, and the rotor end cover precursor 10 is used for a rotor end cover of a new energy automobile motor.
Referring to fig. 2, in one embodiment, the rotor end cover precursor 10 includes a base 100 and a wheel frame 200, the wheel frame 200 is connected to one surface of the base 100, the wheel frame 200 includes an outer connecting ring 210, spokes 220 and an inner connecting disc 230, the outer connecting ring 210 and the inner connecting disc 230 are connected by the spokes 220, the number of the spokes 220 is a plurality, each spoke 220 is respectively connected with the outer connecting ring 210 and the inner connecting disc 230, a plurality of the spokes 220 are axisymmetric with respect to the inner connecting disc 230, heat dissipation grooves 102 are formed between each two spokes 220, the other surface of the base 100 is provided with a weight-reducing cavity 104, and the base 100 and the wheel frame 200 are formed by die casting of the die casting aluminum alloy. In this embodiment, the outer connecting ring 210 is used for connecting with the outer housing, the outer connecting ring 210 is connected with the inner connecting disk 230 through the spokes 220, and the spokes 220 can perform a reinforcing function on the rotor end cover precursor 10, so as to improve the structural strength of the rotor end cover precursor 10. Further, the spokes 220 include a plurality of spokes 220, each spoke 220 is connected with the outer connecting ring 210 and the inner connecting disc 230, and the plurality of spokes 220 are symmetrical about the central axis of the inner connecting disc 230, so that the structural strength of the rotor end cover precursor 10 is enhanced while the structural stability of the rotor end cover precursor 10 is also improved; The heat dissipation grooves 102 are formed between every two spokes 220, so that a good heat dissipation effect can be achieved on the motor, and the running stability of the motor is ensured. Further, the base 100 and the wheel frame 200 are die-cast from the die-cast aluminum alloy of the above embodiment, which has advantages of light weight and high strength, and has superior yield strength and tensile strength. In the die-casting process of the rotor end cover precursor 10, the base 100 and the wheel frame 200 need to be integrally extruded and cast, and particularly, the integral molding difficulty of the wheel frame 200 is high, so that the rotor end cover precursor 10 needs to have strong yield strength, and irreversible deformation, such as bending or breaking of the spokes 220, caused by excessive stamping stress in the processing process of the rotor end cover precursor 10 is prevented, thereby ensuring the structural strength and heat dissipation performance of the rotor end cover precursor 10. Furthermore, a heat dissipation groove 102 is provided between every two spokes 220, the heat dissipation groove 102 is mainly used for achieving the heat dissipation effect on the motor, and because the rotor end cover precursor 10 is formed by adopting the die casting aluminum alloy, firstly, 0.7 to 0.9 part of Fe, 3.2 to 3.6 parts of Cu, 0.4 to 0.5 part of Mg and 0.1 to 0.2 part of Ti are adopted in the die casting aluminum alloy, the strength and the light weight effect of the aluminum alloy are improved, and meanwhile, the heat conduction coefficient of the aluminum alloy, namely the rotor end cover precursor 10, can be improved, so that the rotor end cover precursor 10 can achieve better heat absorption and heat dissipation effects, Heat generated by the motor rotor is prevented from accumulating in the rotor end cap precursor 10, causing localized overheating problems. In addition, 7.8 to 9.2 parts of Si, 0 to 0.5 parts of Mn, 0 to 0.5 parts of Ni, 0.6 to 1.2 parts of Zn, 0 to 0.1 parts of Pb, 0 to 0.35 parts of Sn and the balance of Al, the mechanical properties, heat dissipation and weight saving of the rotor end cap precursor 10 can be further improved, for example, the rotor end cap precursor 10 contains 7.8 to 9.2 parts of silicon and 3.2 to 3.6 parts of Cu by mass, the rotor end cap precursor 10 can be ensured to have the advantages of good mechanical properties and weight saving, and the heat conduction properties of the rotor end cap precursor 10 can be further improved, Further, it is ensured that the rotor end cover precursor 10 can uniformly and continuously dissipate the residual heat transferred through the heat absorption layer and the heat conduction layer, so that the heat is prevented from accumulating on the heat dissipation layer, and a local overheating phenomenon is caused. The heat dissipation layer is one side of the rotor end cover precursor 10 containing the wheel frame 200, and the heat absorption layer is one side of the rotor end cover precursor 10 facing away from the wheel frame 200.
In one embodiment, as shown in fig. 1 and 2, the rotor end cap precursor 10 further comprises a positioning boss 300, wherein the positioning boss 300 is connected to the inner connecting plate 230. It will be appreciated that the rotor end cap precursor 10 requires further stamping operations to form the finished rotor end cap precursor 10. However, during the stamping process, stamping deviation is liable to occur, thereby affecting the accuracy of the finished product of the rotor end cap precursor 10. In order to further improve the stamping accuracy of the finished product of the rotor end cover precursor 10, in this embodiment, the rotor end cover precursor 10 further includes a positioning boss 300, the positioning boss 300 is connected to the central portion of the inner connecting disc 230, and a better processing positioning effect can be achieved through the positioning boss 300, so that the stamping operation is conveniently performed on the rotor end cover precursor 10, and the stamping accuracy of the finished product of the rotor end cover is further improved.
In one embodiment, as shown in fig. 2, the edge of the heat sink 102 is provided with a clearance curve 240. In this embodiment, each two spokes 220 and the outer connecting ring 210 and the inner connecting plate 230 respectively enclose a heat dissipation groove 102, a space avoidance curved surface 240 is disposed at the edge of the heat dissipation groove 102, the space avoidance curved surface 240 includes a first step curved surface 2410 and a second step curved surface 2420, one side of the second step curved surface 2420 is connected with the first step curved surface 2410, the other side of the second step curved surface 2420 is connected with the base 100, and the orthographic projection area of the second step curved surface 2420 is larger than the orthographic projection area of the first step curved surface 2410, so, when the rotor end plate is stamped, a space avoidance effect can be formed at the edge of the heat dissipation groove 102, thereby improving the stamping accuracy of the heat dissipation groove 102 and further improving the heat dissipation effect of the rotor end cover.
In one embodiment, a method of preparing a rotor end cap precursor includes the steps of:
and S600, melting the die-casting aluminum alloy to obtain a molten alloy.
It can be appreciated that the die-casting aluminum alloy prepared through the steps has higher yield strength and tensile strength, and in order to further prepare the die-casting aluminum alloy capable of meeting the requirements of new energy electric vehicles for manufacturing high-strength parts, in the embodiment, the die-casting aluminum alloy is subjected to melting operation so as to be convenient for pouring the melted alloy into a die cavity, and a rotor end cover precursor with a required structure is obtained through extrusion casting.
And S700, performing extrusion casting operation on the molten alloy to obtain a rotor end cover precursor.
In the embodiment, through carrying out extrusion casting operation on the molten alloy, the problem that the traditional die casting is easy to roll up is avoided by utilizing slower cavity filling, and on the other hand, timely and powerful pressurizing feeding from a pouring system can be obtained when the casting is shrunk and solidified, so that the rotor end cover precursor with smooth appearance and internal compactness is obtained.
Compared with the prior art, the invention has at least the following advantages:
1. In the preparation method of the die-casting aluminum alloy, the density of the molten alloy aluminum liquid can be effectively improved by purifying the molten alloy aluminum liquid, so that the alloy aluminum liquid has higher yield strength and tensile strength after the die-casting aluminum alloy is formed.
2. In the preparation method of the die-casting aluminum alloy, the aluminum alloy liquid has higher density after purification treatment, and further, the die-casting mold is subjected to primary preheating and heat preservation operation, so that the die-casting mold is heated to a preset temperature, the temperature stability is kept in the die-casting process, and meanwhile, the trough of the die-casting machine achieves the effect of preheating and heat preservation, thereby effectively controlling the pre-crystallization of the aluminum liquid, enhancing refined crystal particles, improving the uniformity of crystal grains, reducing or eliminating the problem of stress concentration in an aluminum alloy material, further improving the yield strength and the tensile strength of the die-casting aluminum alloy, and meeting the requirements of new energy electric vehicles for manufacturing high-strength parts.
3. In the preparation method of the die-casting aluminum alloy, the die-casting water quenching operation is carried out on the aluminum alloy die-casting part, so that the stress of the aluminum alloy die-casting part can be eliminated in a short period, and the yield strength and the tensile strength of the die-casting aluminum alloy are improved, and meanwhile, the stability of high yield strength and high tensile strength is further ensured.
The foregoing examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (1)
1. A method for preparing a die-casting aluminum alloy rotor end cover precursor, which is characterized in that the rotor end cover precursor comprises a die-casting aluminum alloy;
the preparation method of the die-casting aluminum alloy comprises the following steps:
Carrying out mixed melting operation on the aluminum alloy raw materials to obtain alloy aluminum liquid;
purifying the alloy aluminum liquid, and obtaining pre-cast aluminum liquid by purifying the melted alloy aluminum liquid;
Carrying out primary preheating and heat preservation operation on the die-casting mould;
Conveying the pre-cast aluminum liquid to a die casting machine for die casting operation to obtain an aluminum alloy die casting;
Performing die casting water quenching operation on the aluminum alloy die casting to obtain a die casting aluminum alloy;
Performing heat treatment operation on the die-casting aluminum alloy;
After the step of mixing and melting the aluminum alloy raw materials to obtain alloy aluminum liquid and before the step of purifying the alloy aluminum liquid to obtain pre-cast aluminum liquid, the preparation method of the die-casting aluminum alloy further comprises the following steps:
carrying out slag skimming treatment operation on the alloy aluminum liquid;
The temperature in the first preheating and heat preserving operation is 200-220 ℃;
After the step of preheating and preserving heat of the die casting mold and before the step of conveying the pre-cast aluminum liquid to a die casting machine for die casting operation to obtain an aluminum alloy die casting, the preparation method of the die casting aluminum alloy further comprises the following steps:
Carrying out secondary preheating and heat preservation operation on the trough of the die casting machine; the temperature in the second preheating and heat preserving operation is 180-200 ℃;
The die-casting aluminum alloy comprises the following components in parts by weight:
7.8-9.2 parts of Si;
0.7-0.9 parts of Fe;
3.2-3.6 parts of Cu;
mn 0-0.5 part;
0.4-0.5 parts of Mg;
0-0.5 parts of Ni;
0.6-1.2 parts of Zn;
0.1-0.2 parts of Ti;
Pb 0-0.1 parts;
0-0.35 parts of Sn;
the balance of Al, and the impurity is controlled below 0.5 part;
After the step of mixing and melting the aluminum alloy raw materials to obtain alloy aluminum liquid and before the step of purifying the alloy aluminum liquid to obtain pre-cast aluminum liquid, the preparation method of the die-casting aluminum alloy further comprises the following steps:
performing Mg and Ti element supplementing operation on the alloy aluminum liquid;
the supplementing amount of the Mg element is 0.4-0.5 part, and the supplementing amount of the Ti element is 0.1-0.2 part;
The rotor end cover precursor comprises a base and a wheel frame, wherein the wheel frame is connected to one surface of the base, the wheel frame comprises an outer connecting ring, spokes and an inner connecting disc, the outer connecting ring is connected with the inner connecting disc through the spokes, the number of the spokes is multiple, each spoke is respectively connected with the outer connecting ring and the inner connecting disc, a plurality of spokes are symmetrical about the inner connecting disc in a central axis manner, a radiating groove is formed between every two spokes, a position avoiding curved surface is arranged at the edge of the radiating groove, the position avoiding curved surface comprises a first step curved surface and a second step curved surface, one side of the second step curved surface is connected with the first step curved surface, the other side of the second step curved surface is connected with the base, the orthographic projection area of the second step curved surface is larger than that of the first step curved surface, a weight reducing cavity is formed in the other side of the base, and the wheel frame is formed by die casting of the die casting aluminum alloy; the outer connecting ring is connected with the outer shell, and the outer connecting ring is connected with the inner connecting disc through spokes, so that the rotor end cover precursor can be reinforced through the spokes, and the structural strength of the rotor end cover precursor is improved; the spokes comprise a plurality of spokes, each spoke is respectively connected with the outer connecting ring and the inner connecting disc, and the spokes are symmetrical about the central axis of the inner connecting disc, so that the structural strength of the precursor of the rotor end cover is enhanced, and the structural stability of the precursor of the rotor end cover is improved; the base and the wheel frame are integrally formed by die casting of die casting aluminum alloy.
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| CN102328057A (en) * | 2011-08-01 | 2012-01-25 | 常熟市宏达印染机械有限公司 | Feeding device of die casting machine |
| CN109439981A (en) * | 2019-01-11 | 2019-03-08 | 华劲新材料研究院(广州)有限公司 | A kind of heat transmission high strength die-casting aluminum alloy and preparation method thereof |
| CN110257675A (en) * | 2019-06-18 | 2019-09-20 | 东莞鸿图精密压铸有限公司 | A kind of high strength die-casting aluminum alloy and preparation method thereof |
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| CN102328057A (en) * | 2011-08-01 | 2012-01-25 | 常熟市宏达印染机械有限公司 | Feeding device of die casting machine |
| CN109439981A (en) * | 2019-01-11 | 2019-03-08 | 华劲新材料研究院(广州)有限公司 | A kind of heat transmission high strength die-casting aluminum alloy and preparation method thereof |
| CN110257675A (en) * | 2019-06-18 | 2019-09-20 | 东莞鸿图精密压铸有限公司 | A kind of high strength die-casting aluminum alloy and preparation method thereof |
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