CN115679169A - High-strength aluminum alloy die casting for automobile engine bracket and preparation method thereof - Google Patents
High-strength aluminum alloy die casting for automobile engine bracket and preparation method thereof Download PDFInfo
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- 238000004512 die casting Methods 0.000 title claims abstract description 102
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title description 12
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 56
- 239000000956 alloy Substances 0.000 claims abstract description 56
- 238000010438 heat treatment Methods 0.000 claims abstract description 56
- 229910052751 metal Inorganic materials 0.000 claims abstract description 54
- 239000002184 metal Substances 0.000 claims abstract description 54
- 238000003756 stirring Methods 0.000 claims abstract description 45
- 239000000463 material Substances 0.000 claims abstract description 33
- 238000003723 Smelting Methods 0.000 claims abstract description 28
- 229910018137 Al-Zn Inorganic materials 0.000 claims abstract description 19
- 229910018573 Al—Zn Inorganic materials 0.000 claims abstract description 19
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 17
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 15
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 13
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 6
- 150000002739 metals Chemical class 0.000 claims abstract description 4
- 239000011248 coating agent Substances 0.000 claims description 32
- 238000000576 coating method Methods 0.000 claims description 32
- 238000005266 casting Methods 0.000 claims description 25
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 12
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 12
- 238000004140 cleaning Methods 0.000 claims description 12
- 229910052712 strontium Inorganic materials 0.000 claims description 12
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 claims description 12
- 229910052719 titanium Inorganic materials 0.000 claims description 12
- 239000010936 titanium Substances 0.000 claims description 12
- 229910052726 zirconium Inorganic materials 0.000 claims description 12
- 238000003860 storage Methods 0.000 claims description 11
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 8
- 230000032683 aging Effects 0.000 claims description 8
- 239000000843 powder Substances 0.000 claims description 4
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 3
- 229960000892 attapulgite Drugs 0.000 claims description 3
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 3
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 3
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 3
- BFMKFCLXZSUVPI-UHFFFAOYSA-N ethyl but-3-enoate Chemical compound CCOC(=O)CC=C BFMKFCLXZSUVPI-UHFFFAOYSA-N 0.000 claims description 3
- 229910052625 palygorskite Inorganic materials 0.000 claims description 3
- 239000011863 silicon-based powder Substances 0.000 claims description 3
- 229920002545 silicone oil Polymers 0.000 claims description 3
- 229910052684 Cerium Inorganic materials 0.000 claims description 2
- 229910052777 Praseodymium Inorganic materials 0.000 claims description 2
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 claims description 2
- 238000000227 grinding Methods 0.000 claims description 2
- 229910052746 lanthanum Inorganic materials 0.000 claims description 2
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims description 2
- PUDIUYLPXJFUGB-UHFFFAOYSA-N praseodymium atom Chemical compound [Pr] PUDIUYLPXJFUGB-UHFFFAOYSA-N 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 3
- 229910002065 alloy metal Inorganic materials 0.000 claims 1
- 239000007788 liquid Substances 0.000 claims 1
- 238000002844 melting Methods 0.000 claims 1
- 230000008018 melting Effects 0.000 claims 1
- 238000009418 renovation Methods 0.000 claims 1
- 230000000704 physical effect Effects 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 8
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 230000006872 improvement Effects 0.000 description 4
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- 239000002994 raw material Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000007605 air drying Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013530 defoamer Substances 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 238000010992 reflux Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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Abstract
The invention discloses a high-strength aluminum alloy die casting for an automobile engine bracket, belonging to the technical field of die castings, wherein the die casting is made of Al-Zn alloy, and is characterized in that molten metal of the Al-Zn alloy is prepared according to the following method: adding an industrial pure Al ingot and an Al-2Sc intermediate alloy into a heating furnace together for smelting, standing for a period of time after fully stirring to obtain a material A, adding industrial pure Zn and Al-50Mg intermediate alloy and trace rare metals and rare earth metals into the heating furnace for further smelting, standing for a period of time after fully stirring to obtain a material B, then adding a defoaming agent into the heating furnace for stirring, adding an ultrasonic vibrator for ultrasonic vibration after stirring, and obtaining molten metal of the Al-Zn alloy after finishing vibration; the high-strength aluminum alloy die casting for the automobile engine bracket prepared by using the molten metal has higher physical property, namely, bubbles are relatively less, so that the strength performance is better under the same condition.
Description
Technical Field
The invention relates to the technical field of die castings, in particular to a high-strength aluminum alloy die casting for an automobile engine bracket and a preparation method thereof.
Background
The aluminum alloy die-casting products are mainly used in the industries of electronics, automobiles, motors, household appliances, communications and the like, and high-quality aluminum alloy products with high performance, high precision and high toughness are also used in the industries with higher requirements such as large airplanes, ships and the like. The main application of the prior art is also parts of some apparatuses, such as engine brackets of automobiles and the like.
The strength of an aluminum alloy die casting is affected by various factors including air bubbles inside the die casting, and in the prior art, although various improvements have been made to an aluminum alloy raw material to enhance the strength of the aluminum alloy as the industry develops, there is still a lack of improvement in the point that air bubbles are easily stored in the die casting during the preparation process, and therefore, the present invention is directed to provide a high-strength aluminum alloy die casting for an automobile engine bracket and a preparation method thereof, the amount of air bubbles inside the die casting prepared by the preparation method is greatly reduced, and the strength of the die casting can be further improved.
Disclosure of Invention
The invention aims to provide a high-strength aluminum alloy die casting for an automobile engine bracket and a preparation method thereof, and aims to solve the following technical problems:
in the prior art, although various improvements are made to the aluminum alloy raw material to enhance the strength of the aluminum alloy as it is developed, there is still a lack of improvement in that bubbles are easily stored in the die cast part during the preparation thereof, resulting in the strength of the die cast part being affected.
The purpose of the invention can be realized by the following technical scheme:
a high-strength aluminum alloy die casting for an automobile engine bracket, which is made of an Al-Zn alloy, and a molten metal of the Al-Zn alloy is prepared by the following method:
adding an industrial pure Al ingot and an Al-2Sc intermediate alloy into a heating furnace together for smelting, standing for a period of time after fully stirring to obtain a material A, adding industrial pure Zn and Al-50Mg intermediate alloy and trace rare metals and rare earth metals into the heating furnace for further smelting, standing for a period of time after fully stirring to obtain a material B, then adding a defoaming agent into the heating furnace for stirring, adding an ultrasonic vibrator for ultrasonic vibration after stirring, and obtaining the Al-Zn alloy molten metal after finishing vibration.
In a further aspect: when smelting pure Al ingot and Al-2Sc intermediate alloy, the temperature of the heating furnace is 790-810 ℃, and the standing time is 28-32 min; when smelting is carried out after pure Zn and Al-50Mg intermediate alloy, trace rare metal and rare earth metal are added, the temperature of a heating furnace is reduced to 720-740 ℃, and the standing time is 18-22 min.
In a further aspect: the rare elements mainly comprise titanium, zirconium and strontium, and the rare elements mainly comprise lanthanum, cerium and praseodymium.
In a further aspect: adding defoaming agent and stirring for 10-15 min, adding ultrasonic vibrator and ultrasonic vibrating for 20-30 min while maintaining the temperature in the heating furnace at 720-740 deg.c.
In a further aspect: the addition amount of the defoaming agent is 0.1 percent of the molten metal.
In a further aspect: the mass sum of the Al ingot and the Al-2Sc master alloy and the mass sum of the Zn and the Al-50Mg master alloy are in a ratio of 1: (0.12-0.28), wherein the mass ratio of the Al ingot to the Al-2Sc master alloy is 40.
The preparation method of the high-strength aluminum alloy die casting for the automobile engine bracket comprises the following steps:
step I: debugging a die casting machine, and installing a die casting mold;
step II: preheating a mould, coating a coating on the mould, cleaning the mould after the coating is air-dried, and closing the mould;
step III: feeding the molten metal into a material storage box of a die casting machine through a spiral conveying rod, starting a switch to pour and inject and maintaining pressure;
step IV: opening the die, pulling a core and taking out a part, checking the quality of the die casting and trimming;
step V; and 4, carrying out aging treatment on the die casting finished in the step 4 to finally obtain the high-strength aluminum alloy die casting for the automobile engine bracket.
In a further aspect: in the step I, the wall thickness of the adopted die-casting mould is 120-150 mm; in the step II, the preheating temperature of the die is 150-180 ℃.
In a further aspect: the preparation method of the coating comprises the following steps:
placing attapulgite and silicone oil in a material box according to the mass ratio of 3; the powder, silicon powder, ethyl vinyl acetate, carboxymethyl cellulose and ethanol are added into a wet ball mill to be ground for 2.5 to 3.5 hours, and then the aluminum alloy casting coating is obtained.
The invention has the beneficial effects that:
(1) In the invention, the ultrasonic vibrator is added in the preparation process of the molten metal, and bubbles hidden in the molten metal can be vibrated and eliminated under the action of ultrasonic waves, so that the bubbles in the molten metal are reduced, the phenomenon of large bubble content in a die casting in the subsequent die casting process is avoided, and the strength performance of the die casting is favorably improved;
(2) In the process of transporting the prepared molten metal to a die casting machine, the spiral conveying rod is adopted for conveying, so that on one hand, the conveying efficiency is good, on the other hand, when the molten metal passes through the spiral conveying rod, the molten metal can move to a certain degree under the action of the spiral conveying rod, hidden bubbles in the molten metal can be further eliminated in the moving process, and the phenomenon that the molten metal entering the die casting machine contains bubbles can be better avoided.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Adding 4kg of industrial pure Al ingot and 0.3kg of Al-2Sc intermediate alloy into a heating furnace at 800 ℃ for smelting, fully stirring and standing for 30min to obtain a material A, adding 0.52kg of industrial pure Zn, 0.039kg of Al-50Mg intermediate alloy and trace titanium, zirconium, strontium and rare earth metals into the heating furnace, reducing the temperature of the heating furnace to 730 ℃ for continuous smelting, fully stirring and standing for 20min to obtain a material B, adding 4.859g of defoaming agent into the heating furnace for stirring for 13min, then adding an ultrasonic vibrator for ultrasonic vibration for 25min, obtaining molten metal of the Al-Zn alloy after the vibration is finished, sending the molten metal into a storage box of a die casting machine through a spiral conveying rod, debugging the die casting machine, installing a die casting die with the wall thickness of 135mm, preheating the die at 170 ℃, coating the die, cleaning the die after the coating is air dried, pouring the die, starting a switch for injection and pressure injection of the molten metal, then pressing the die casting, taking a core pulling, checking the quality, repairing, aging, finishing the bracket for the automobile and obtaining the final high-strength die casting engine.
Example 2
Adding 4kg of industrial pure Al ingot and 0.3kg of Al-2Sc intermediate alloy into a heating furnace with the temperature of 800 ℃ together for smelting, fully stirring, standing for 30min to obtain a material A, adding 0.60kg of industrial pure Zn, 0.045kg of Al-50Mg intermediate alloy and trace titanium, zirconium, strontium and rare earth metals into the heating furnace, cooling the temperature of the heating furnace to 730 ℃ for continuous smelting, fully stirring, standing for 20min to obtain a material B, adding 4.945g of defoaming agent into the heating furnace, stirring for 13min, adding an ultrasonic vibrator, performing ultrasonic vibration for 25min, obtaining molten metal of the Al-Zn alloy after vibration is finished, sending the molten metal into a storage box of a die casting machine through a spiral transmission rod, debugging the die casting machine, installing a die casting die with the wall thickness of 135mm, preheating the die at 170 ℃, coating on the die, air drying the coating, cleaning the die and closing the die, starting a switch to perform injection and pressure maintaining on the molten metal, opening the die casting die, extracting a core, checking the quality of the die casting die, repairing, performing aging treatment, and repairing on the die casting of the automobile support to obtain a die casting aluminum alloy with high strength.
Example 3
Adding 4kg of industrial pure Al ingot and 0.3kg of Al-2Sc intermediate alloy into a heating furnace at 800 ℃ for smelting, fully stirring and standing for 30min to obtain a material A, adding 0.72kg of industrial pure Zn, 0.054kg of Al-50Mg intermediate alloy and trace titanium, zirconium, strontium and rare earth metals into the heating furnace, reducing the temperature of the heating furnace to 730 ℃ for continuous smelting, fully stirring and standing for 20min to obtain a material B, adding 5.074g of defoaming agent into the heating furnace for stirring for 13min, adding an ultrasonic vibrator for ultrasonic vibration for 25min, obtaining molten metal of the Al-Zn alloy after the vibration is finished, sending the molten metal into a storage box of a die casting machine through a spiral conveying rod, debugging the die casting machine, installing a die casting die with the wall thickness of 135mm, preheating the die at 170 ℃, coating the die, cleaning the die after the coating is air dried, pouring the die, starting a switch for injection and pressure injection of the molten metal, then obtaining a die casting piece, checking the quality of the core pulling piece, checking, finishing the quality of the die casting, and finishing the automobile support to obtain the final high-strength engine support for die casting.
Example 4
Adding 4kg of industrial pure Al ingot and 0.3kg of Al-2Sc intermediate alloy into a heating furnace at 800 ℃ for smelting, fully stirring and standing for 30min to obtain a material A, adding 0.80kg of industrial pure Zn, 0.060kg of Al-50Mg intermediate alloy and trace titanium, zirconium, strontium and rare earth metals into the heating furnace, reducing the temperature of the heating furnace to 730 ℃ for continuous smelting, fully stirring and standing for 20min to obtain a material B, adding 5.160g of defoaming agent into the heating furnace for stirring for 13min, then adding an ultrasonic vibrator for ultrasonic vibration for 25min, obtaining molten metal of the Al-Zn alloy after the vibration is finished, sending the molten metal into a storage box of a die casting machine through a spiral transmission rod, debugging the die casting machine, installing a die casting die with the wall thickness of 135mm, preheating the die at 170 ℃, coating on the die, after the coating is air-dried, cleaning the die and closing the die, starting a switch for casting the molten metal and injecting the die casting, then opening the die casting die, checking the quality of the core pulling, checking and repairing the quality of the die casting, and repairing an automobile support to obtain a high-strength engine support for final high-strength engine.
Example 5
Adding 4kg of industrial pure Al ingot and 0.3kg of Al-2Sc intermediate alloy into a heating furnace at 800 ℃ for smelting, fully stirring and standing for 30min to obtain a material A, adding 0.92kg of industrial pure Zn, 0.069kg of Al-50Mg intermediate alloy and trace titanium, zirconium, strontium and rare earth metals into the heating furnace, reducing the temperature of the heating furnace to 730 ℃ for continuous smelting, fully stirring and standing for 20min to obtain a material B, adding 5.289g of defoaming agent into the heating furnace for stirring for 13min, then adding an ultrasonic vibrator for ultrasonic vibration for 25min, obtaining molten metal of the Al-Zn alloy after the vibration is finished, sending the molten metal into a storage box of a die casting machine through a spiral conveying rod, debugging the die casting machine, installing a die casting die with the wall thickness of 135mm, preheating the die at 170 ℃, coating on the die, after the coating is air-dried, cleaning the die and repairing the die, starting a switch for casting the molten metal, opening the die casting die, maintaining the die, extracting the core, checking the quality, repairing the die, aging, and repairing the final bracket for the automobile engine to obtain the die-cast high-strength.
Example 6
Adding 4kg of industrial pure Al ingot and 0.3kg of Al-2Sc intermediate alloy into a heating furnace at 800 ℃ for smelting, fully stirring and standing for 30min to obtain a material A, adding 1.00kg of industrial pure Zn, 0.075kg of Al-50Mg intermediate alloy and trace titanium, zirconium, strontium and rare earth metals into the heating furnace, cooling the temperature of the heating furnace to 730 ℃ for continuous smelting, fully stirring and standing for 20min to obtain a material B, adding 5.375g of defoaming agent into the heating furnace for stirring for 13min, adding an ultrasonic vibrator for ultrasonic vibration for 25min, obtaining molten metal of the Al-Zn alloy after the vibration is finished, sending the molten metal into a storage box of a die casting machine through a spiral conveying rod, debugging the die casting machine, installing a die casting die with the wall thickness of 135mm, preheating the die at 170 ℃, coating on the die, after the coating is air-dried, cleaning the die and closing the die, starting a switch for pouring and injecting the molten metal, opening the die casting die, checking the quality of the die casting die, checking and keeping the pressure, refitting the die casting, and obtaining a high-strength engine support for refitting.
Example 7
Adding 4kg of industrial pure Al ingot and 0.3kg of Al-2Sc intermediate alloy into a heating furnace at 800 ℃ for smelting, fully stirring and standing for 30min to obtain a material A, adding 1.08kg of industrial pure Zn, 0.081kg of Al-50Mg intermediate alloy and trace titanium, zirconium, strontium and rare earth metals into the heating furnace, reducing the temperature of the heating furnace to 730 ℃ for continuous smelting, fully stirring and standing for 20min to obtain a material B, adding 5.461g of defoaming agent into the heating furnace for stirring for 13min, then adding an ultrasonic vibrator for ultrasonic vibration for 25min, obtaining molten metal of the Al-Zn alloy after the vibration is finished, sending the molten metal into a storage box of a die casting machine through a spiral transmission rod, debugging the die casting machine, installing a die casting die with the wall thickness of 135mm, preheating the die at 170 ℃, coating the die, after the coating is air-dried, cleaning the die and repairing the die, starting a switch for casting the molten metal, opening the die casting die, maintaining the die, extracting a core, checking the quality, repairing the die, aging, and repairing the bracket of the automobile to obtain the final high-strength aluminum alloy bracket for die casting.
It is to be noted that in examples 1 to 7, the coating applied to the mold was prepared by the following method: placing 3kg of attapulgite and 1kg of silicone oil in a feed box, adding ethanol solvent into the feed box, heating the feed box in a water bath at 50 ℃, simultaneously carrying out reflux stirring, keeping for 3 hours, then adjusting the temperature of the water bath to 90 ℃, evaporating to dryness to obtain a material C, and transferring the material C to a muffle furnace for roasting to obtain powder; adding the powder, silicon powder, ethyl vinyl acetate, carboxymethyl cellulose and ethanol into a wet ball mill, and grinding for 3 hours to obtain the aluminum alloy casting coating;
meanwhile, the shapes of the casting molds used were all rectangular solids, and the inner dimensions were all 10cm × 5cm × 2cm.
To facilitate a clearer view of the data for variations found in examples 1-7, the data for the commercially pure Al ingot, al-2Sc master alloy, commercially pure Zn, al-50Mg master alloy, and defoamer for each example are presented in Table 1, below:
TABLE 1
The castings prepared in examples 1 to 7 were evaluated for bubble content, and the principle and method of the test were as follows:
the method comprises the steps of calculating the density of a casting according to the composition of molten metal raw materials of the casting, calculating the volume of the casting by combining the size of a casting die, calculating the ideal mass of the casting in a bubble-free state according to a formula mass = density volume, and weighing the mass of the actually manufactured casting.
The "actual mass/ideal mass" ratio (hereinafter referred to as "actual ratio") of the castings obtained in examples 1 to 7 was calculated using the above method, and the data is shown in table 2, table 2 below:
TABLE 2
The data in table 2 are analyzed, and it can be known that the physical ratios of the castings obtained in examples 1 to 7 are quite high, and are all over 99.00%, wherein the physical ratio of the casting obtained in example 4 is the highest and reaches 99.99%; the method has the advantages that the bubbles in the casting parts prepared by the preparation method provided by the invention are quite few, the influence of the strength reduction of the casting parts caused by the bubbles is minimal, and the strength performance of the casting parts is improved to a certain extent.
Since the cast product obtained in example 4 had the highest practical ratio, a comparative test was conducted next using example 4 as a blank.
Comparative example 1
Adding 4kg of industrial pure Al ingot and 0.3kg of Al-2Sc intermediate alloy into a heating furnace with the temperature of 800 ℃ together for smelting, fully stirring and standing for 30min to obtain a material A, adding 0.80kg of industrial pure Zn, 0.060kg of Al-50Mg intermediate alloy and trace titanium, zirconium, strontium and rare earth metal into the heating furnace, reducing the temperature of the heating furnace to 730 ℃ for further smelting, fully stirring and standing for 20min to obtain a material B, adding 5.160g of defoaming agent into the heating furnace for stirring for 13min to obtain molten metal of the Al-Zn alloy, sending the molten metal into a tank of a die casting machine through a spiral conveying rod, debugging the die casting machine, installing a die casting mold with the wall thickness of 135mm, preheating the mold at 170 ℃, coating on the mold, air-drying the coating, cleaning the mold and closing the mold, starting a switch for pouring and pressurizing the molten metal, taking a casting piece, checking the quality of the die casting piece, carrying out aging treatment on the repaired die casting piece, and finally obtaining the high-strength aluminum alloy bracket for the automobile engine.
Comparative example 2
Adding 4kg of industrial pure Al ingot and 0.3kg of Al-2Sc intermediate alloy into a heating furnace at 800 ℃ for smelting, fully stirring and standing for 30min to obtain a material A, adding 0.80kg of industrial pure Zn, 0.060kg of Al-50Mg intermediate alloy and trace titanium, zirconium, strontium and rare earth metals into the heating furnace, reducing the temperature of the heating furnace to 730 ℃ for continuous smelting, fully stirring and standing for 20min to obtain a material B, adding 5.160g of defoaming agent into the heating furnace for stirring for 13min, then adding an ultrasonic vibrator for ultrasonic vibration for 25min, obtaining molten metal of the Al-Zn alloy after the vibration is finished, directly adding the molten metal into a storage box of a die casting machine, debugging the die casting machine, installing a die casting die with the wall thickness of 135mm, preheating the die at 170 ℃, coating the die on the die, after the coating is air-dried, cleaning the die and closing the die, starting a switch for pouring the molten metal, injecting and taking out a core-pressing piece, checking the quality of the die casting, refitting the die-casting, and obtaining the high-strength aluminum alloy bracket for the engine.
Comparative example 3
Adding 4kg of industrial pure Al ingot and 0.3kg of Al-2Sc intermediate alloy into a heating furnace with the temperature of 800 ℃ for smelting, fully stirring and standing for 30min to obtain a material A, adding 0.80kg of industrial pure Zn, 0.060kg of Al-50Mg intermediate alloy and trace titanium, zirconium, strontium and rare earth metals into the heating furnace, reducing the temperature of the heating furnace to 730 ℃ for continuous smelting, fully stirring and standing for 20min to obtain a material B, adding 5.160g of defoaming agent into the heating furnace for stirring for 13min to obtain molten metal of the Al-Zn alloy, directly adding the molten metal into a storage box of a die casting machine, debugging the die casting machine, installing a die casting mold with the wall thickness of 135mm, preheating the die casting at 170 ℃, coating on the mold, after the coating is dried in the air, cleaning the mold and closing the mold, starting a switch to pour, inject, press and press-extract a core and maintain pressure for the molten metal, opening the die casting, taking out, checking the quality of the die casting, aging the die casting after finishing, and finally obtaining the high-strength aluminum alloy for the automobile engine bracket.
Comparative examples 4 to 5
High-strength aluminum alloy die castings for automobile engine brackets, which are produced by two different manufacturers and have the size of 10cm x 5cm x 2cm, are randomly purchased directly from the market.
The castings obtained in comparative examples 1 to 5 were evaluated for the bubble content, using the same principle and method as those of the castings obtained in examples 1 to 7, and the actual ratios of the castings obtained in comparative examples 1 to 3 were calculated, and the data are shown in table 3, which is as follows:
TABLE 3
As can be seen from the analysis of the data in Table 3, the physical ratios of the castings in comparative examples 1 to 5 are all lower than those in any one of examples 1 to 7, and it can be understood that the high-strength aluminum alloy die-cast parts for automobile engine brackets produced by the method of the present invention have a higher physical ratio, that is, relatively less blisters, and therefore have better strength properties under the same conditions.
Although one embodiment of the present invention has been described in detail, the description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (9)
1. A high-strength aluminum alloy die-cast part for an automobile engine bracket, which is made of an Al-Zn alloy, characterized in that the molten metal of the Al-Zn alloy is prepared by the following method:
adding an industrial pure Al ingot and an Al-2Sc intermediate alloy into a heating furnace together for smelting, standing for a period of time after fully stirring to obtain a material A, adding industrial pure Zn and Al-50Mg intermediate alloy and trace rare metals and rare earth metals into the heating furnace for further smelting, standing for a period of time after fully stirring to obtain a material B, then adding a defoaming agent into the heating furnace for stirring, adding an ultrasonic vibrator for ultrasonic vibration after stirring, and obtaining the Al-Zn alloy metal liquid after finishing vibration.
2. The high-strength aluminum alloy die casting for the automobile engine bracket as recited in claim 1, wherein when melting pure Al ingot and Al-2Sc master alloy, the temperature of the heating furnace is 790 to 810 ℃, and the standing time is 28 to 32min; when pure Zn and Al-50Mg intermediate alloy, trace rare metals and rare earth metals are added and then smelted, the temperature of a heating furnace is reduced to 720-740 ℃, and the standing time is 18-22 min.
3. The high-strength aluminum alloy die casting for the automobile engine bracket as recited in claim 2, wherein the rare elements mainly include titanium, zirconium and strontium, and the rare elements mainly include lanthanum, cerium and praseodymium.
4. The high-strength aluminum alloy die casting for automobile engine brackets as recited in claim 1, wherein the time for stirring with the addition of the defoaming agent is 10 to 15min, and the time for ultrasonic vibration after the addition of the ultrasonic vibrator is 20 to 30min, during which the temperature of the heating furnace is maintained at 720 to 740 ℃.
5. The high-strength aluminum alloy die casting for automobile engine brackets as defined in claim 4, wherein the amount of the defoaming agent added is 0.1% of the molten metal.
6. The high-strength aluminum alloy die-cast part for an automobile engine bracket according to claim 1, wherein the ratio of the sum of the masses of the Al ingot and the Al-2Sc master alloy to the sum of the masses of the Zn and the Al-50Mg master alloy is 1: (0.12-0.28), wherein the mass ratio of the Al ingot to the Al-2Sc master alloy is 40.
7. A method for producing a high-strength aluminum alloy die-cast article for an automobile engine bracket as defined in any one of claims 1 to 6, comprising the steps of:
step I: debugging a die casting machine, and installing a die casting mold;
and step II: preheating a mould, coating a coating on the mould, cleaning the mould after the coating is air-dried, and closing the mould;
step III: feeding the molten metal into a material storage box of a die casting machine through a spiral conveying rod, starting a switch to pour and inject and maintaining pressure;
step IV: opening the die, pulling the core to take out the die casting, checking the quality of the die casting and refitting the die casting;
step V; and (5) carrying out aging treatment on the die casting subjected to the renovation in the step (4) to finally obtain the high-strength aluminum alloy die casting for the automobile engine bracket.
8. The method for producing a high-strength aluminum alloy die casting for an automobile engine bracket as recited in claim 7, wherein in step i, the wall thickness of the die casting mold used is 120 to 150mm; in the step II, the preheating temperature of the die is 150-180 ℃.
9. The method for producing a high-strength aluminum alloy die casting for an automobile engine bracket as recited in claim 7, wherein in step ii, the coating material is produced by:
placing attapulgite and silicone oil in a material box according to the mass ratio of 3; adding the powder, silicon powder, ethyl vinyl acetate, carboxymethyl cellulose and ethanol into a wet ball mill, and grinding for 2.5-3.5 hours to obtain the aluminum alloy casting coating.
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