CN110257675A - A kind of high strength die-casting aluminum alloy and preparation method thereof - Google Patents

A kind of high strength die-casting aluminum alloy and preparation method thereof Download PDF

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Publication number
CN110257675A
CN110257675A CN201910526416.XA CN201910526416A CN110257675A CN 110257675 A CN110257675 A CN 110257675A CN 201910526416 A CN201910526416 A CN 201910526416A CN 110257675 A CN110257675 A CN 110257675A
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Prior art keywords
die
molten aluminum
temperature
aluminum
furnace
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CN201910526416.XA
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Chinese (zh)
Inventor
章建鹏
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DONGGUAN MODERN METAL PRECISION DIE CASTING Co Ltd
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DONGGUAN MODERN METAL PRECISION DIE CASTING Co Ltd
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Priority to CN201910526416.XA priority Critical patent/CN110257675A/en
Publication of CN110257675A publication Critical patent/CN110257675A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/02Making alloys by melting
    • C22C1/026Alloys based on aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/02Making alloys by melting
    • C22C1/03Making alloys by melting using master alloys
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • C22C21/02Alloys based on aluminium with silicon as the next major constituent
    • C22C21/04Modified aluminium-silicon alloys
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/002Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/043Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with silicon as the next major constituent

Abstract

The invention discloses a kind of high strength die-casting aluminum alloys, the weight percent including following component and each component are as follows: Si 7.8-9.2%, Fe 0.7-1.0%, Cu 3.2-3.8%, Mn 0-0.5%, Mg 0.35-0.5%, Ni 0-0.5%, Zn 0.6-1.2%, Ti 0.1-0.2%, Pb 0-0.1%, Sn 0-0.35%, impurity 0-0.5%, remaining be Al.The invention also discloses a kind of preparation methods of above-mentioned high strength die-casting aluminum alloy.The present invention through the above technical solution made of the yield strength of high strength die-casting aluminum alloy reach 240Mpa, tensile strength reaches 300Mpa or more, can satisfy the requirement of product mechanical performance, meets New-energy electric vehicle for making the requirement of high-intensitive part.

Description

A kind of high strength die-casting aluminum alloy and preparation method thereof
Technical field
The present invention relates to technical field of aluminum alloy technology, especially a kind of high strength die-casting aluminum alloy and preparation method thereof.
Background technique
Automobile industry is in the new era changed comprehensively, Global Auto industry entry motorized, low-carbon, light weight at present Change, is intelligent, the great change epoch that net connectionization, sharedization develop, the increasingly harsh laws and regulations requirement in various countries, new situation is to global vapour Vehicle industry generates extreme shock and challenge, also breeds huge opportunity to develop.
The various fuel vehicles ridden instead of walk are replaced being also inexorable trend, light-weighted core by the new energy vehicle such as light-weighted electric vehicle Heart basis is exactly material, and the material of automotive light weight technology substantially uses aluminium alloy to replace steel at present, it is often more important that is met big The auto parts production technology of batch, non-pack alloy do not belong to, and pack alloy is the main right of a large amount of scientific and technical personnel's researchs As the easiness for cost and acquisition to material is seen, if can pass through research and development of products from the material of existing standard specification Can satisfy the demand of product mechanical performance with process modification, can than develop a kind of completely new material specification come it is more practical, and Easily received.
It would therefore be highly desirable to need a kind of yield strength and tensile strength high, it can be used for making New-energy electric vehicle part High strength die-casting aluminum alloy and preparation method thereof.
Summary of the invention
The object of the present invention is to provide a kind of yield strengths and tensile strength height, can be used for making New-energy electric vehicle The high strength die-casting aluminum alloy of part.
It is a further object of the present invention to provide the preparation methods of above-mentioned high strength die-casting aluminum alloy.
The technical scheme adopted by the invention is that:
A kind of high strength die-casting aluminum alloy, the weight percent including following component and each component are as follows:
Si 7.8-9.2%、Fe 0.7-1.0%、Cu 3.2-3.8%、Mn 0-0.5%、Mg 0.35-0.5%、Ni 0-0.5%、Zn 0.6-1.2%, Ti 0.1-0.2%, Pb 0-0.1%, Sn 0-0.35%, impurity 0-0.5%, remaining be Al.
The preparation method of above-mentioned high strength die-casting aluminum alloy, comprising the following steps:
S1, melting: various raw materials are put into common concentrate in melting furnace or main frequency furnace and are fused into molten aluminum, are reached in temperature of aluminum liquid Slag making is carried out at 730-750 DEG C and takes off Slag treatment, and each chemical component of sample detection;
S2, molten aluminum processing: being added Ti alterant first in molten aluminum transhipment bag, and Ti is closed using the alterant aluminium titanium boron that content is 5% Gold, additional amount is by processing molten aluminum weight ratio 0.2-0.3% and preheats 20 minutes, it is ensured that aluminium titanium boron is in a molten state;By step S1 Obtained in molten aluminum be added into transhipment bag, in mass ratio addition the pure Mg block of 0.50-0.6%, to molten aluminum carry out argon gas rotation essence Refine degasification, it is ensured that the density of molten aluminum reaches 2.6g/cm3 or more, and Mg mass percent is 0.4-0.5%, and Ti mass percent is 0.1-0.2%;
S3 empties die casting machine side furnace in advance, and is heated to 850 DEG C -900 DEG C, and the step S2 molten aluminum handled well is transported to The die casting machine side furnace, and adjust temperature of aluminum liquid in the machine side furnace and stablize at 670-685 DEG C;
Compression mod is preheated to 200-220 DEG C, and stablizes mold temperature using die heater by S4, takes die casting after the completion of die casting Out, it is put into fire and quenches in 6S, water temperature is controlled at 40-50 DEG C;
S5 keeps the temperature die casting, and 188-192 DEG C of holding temperature, soaking time 5h;
S6 takes out die casting room temperature cooling.
The beneficial effects of the present invention are:
The yield strength of high strength die-casting aluminum alloy made of the present invention reaches 240Mpa, and tensile strength reaches 300Mpa or more, The requirement that can satisfy product mechanical performance meets New-energy electric vehicle for making the requirement of high-intensitive part.
Specific embodiment
Several embodiments are given below, and the present invention is described in further detail:
Embodiment 1:
A kind of high strength die-casting aluminum alloy of the present invention, the weight including following component and each component are respectively as follows:
Chemical component: Si 8.52%, Fe 0.99%, Cu 3.54%, Mn 0.152%, Mg 0.41%, Ni0.075%, Zn 0.804%, Ti 0.122%, Pb 0.05%, Sn 0.20%, impurity 0-0.5%, remaining be Al.
The preparation method of above-mentioned high strength die-casting aluminum alloy, comprising the following steps:
S1, melting: various raw materials are put into common concentrate in melting furnace or main frequency furnace and are fused into molten aluminum, by molten aluminum heating temperature Reach 730 DEG C -750 DEG C, carry out slag making using common slagging agent (usage ratio: 2kg/T) and takes off Slag treatment, and samplingization Learn composition detection, chemical component result: Si 8.41%, Fe 0.95%, Cu 3.53%, Mn 0.159%, Mg 0.148%, Ni0.068%, Zn 0.82%, Ti 0.047%, Pb 0.045%, Sn 0.203%, impurity 0-0.5%, remaining be Al.
S2, it takes 420kg molten aluminum to handle: alterant aluminium titanium boron (AlTiB) being added first in molten aluminum transhipment bag (according to above Ti content 0.047% in molten aluminum has been surveyed, AlTiB(has been calculated by 0.24%Ti content ratio and selects Ti content 5% in alterant aluminium titanium boron Alterant) additional amount 16.21kg aluminium titanium boron alterant, calculating process: 420*(0.24%-0.047%)/5%=16.21kg) simultaneously Preheating 20 minutes, it is ensured that aluminium titanium boron is in a molten state;Molten aluminum obtained in step S1 is added into transhipment bag, molten aluminum is handled It is calculated by 0.55% amount containing Mg and adds pure Mg block 1.69kg, calculating process: 420* (0.55%-0.148%)=1.69kg, (due to Mg, Ti element belong to rapid wear element, need to be added supplement to two kinds of elements, therefore both element weight percents contain Measure the amount of supplement: Mg is added according to the super upper limit to 0.50-0.6%, and Ti is added according to the super upper limit to 0.2-0.3%, this It is secondary experiment take Mg by 0.55% addition, Ti by 0.24% addition), to molten aluminum carry out argon gas rotation refining degasification, it is ensured that molten aluminum it is close Degree reaches 2.6g/cm3 or more, and Mg Composition Control is in 0.4-0.5%, and Ti Composition Control is in 0.1-0.2%;
S3 empties die casting machine side furnace in advance, and will be heated to 850 DEG C -900 DEG C in furnace, and the molten aluminum that step S2 is handled well is transported To the die casting machine side furnace, and adjusts temperature of aluminum liquid in the machine side furnace and stablize at 670-685 DEG C;
Compression mod is preheated to 200-220 DEG C, and stablizes mold temperature using die heater by S4, takes die casting after the completion of die casting Out, it is put into fire and quenches in 6S, water temperature is controlled at 40-50 DEG C;
Heat treatment: S5 die casting loading heat-treatment furnace is heat-treated, 188-192 DEG C of (wherein heating-up time 30 of holding temperature Minute, then 188-192 DEG C of constant temperature heat preservation), soaking time 5h;
S6 takes out die casting room temperature cooling in air.
Experimental data:
Detect coupon serial number Casting water quenching Heat treatment condition Yield strength (Mpa) Tensile strength (Mpa) Elongation percentage
Coupon 1# It is 190±2℃ 271.64 337.31 1.36
Coupon 2# It is 190±2℃ 267.41 372.17 2.14
Coupon 3# It is 190±2℃ 263.61 357.11 1.89
Coupon 4# It is 190±2℃ 264.96 366.09 1.94
Coupon 5# It is 190±2℃ 263.31 358.89 1.9
Embodiment 2:
Chemical component: Si 7.99%, Fe 0.81%, Cu 3.6%, Mn 0.159%, Mg 0.43%, Ni0.05%, Zn 0.734%, Ti 0.145%, Pb0.046%, Sn 0.21%, impurity 0-0.5%, remaining be Al.
Experimentation is the same as example 1;
Experimental data:
Detect coupon serial number Casting water quenching Heat treatment condition Yield strength (Mpa) Tensile strength (Mpa) Elongation percentage
Coupon 1# It is 190±2℃ 252.15 350.32 2.04
Coupon 2# It is 190±2℃ 259.37 349.79 1.8
Coupon 3# It is 190±2℃ 257.83 358.6 2.01
Coupon 4# It is 190±2℃ 257.01 333.42 1.52
Coupon 5# It is 190±2℃ 255.41 314.66 1.17
Embodiment 3:
Chemical component: chemical component: Si 8.21%, Fe 0.787%, Cu 3.64%, Mn 0.155%, Mg 0.382%, Ni0.051%, Zn 0.723%, Ti 0.129%, Pb 0.041%, Sn 0.22%, impurity 0-0.5%, remaining be Al.
Experimentation is the same as example 1;
Experimental data:
Detect coupon serial number Casting water quenching Heat treatment condition Yield strength (Mpa) Tensile strength (Mpa) Elongation percentage
Coupon 1# It is 190±2℃ 256.49 303.58 1.03
Coupon 2# It is 190±2℃ 252.5 328.66 1.49
Coupon 3# It is 190±2℃ 253.56 338.31 1.64
Coupon 4# It is 190±2℃ 260.74 338.77 1.49
Coupon 5# It is 190±2℃ 260.19 326.33 1.33
To sum up, the present invention through the above technical solution made of the yield strength of high strength die-casting aluminum alloy reach 240Mpa, resist Tensile strength reaches 300Mpa or more, can satisfy the requirement of product mechanical performance, meets New-energy electric vehicle for making height The requirement of intensity part.
The above described specific embodiments of the present invention are not intended to limit the scope of the present invention..Any basis Any other various changes and modifications made by technical concept of the invention should be included in the guarantor of the claims in the present invention It protects in range.

Claims (2)

1. a kind of high strength die-casting aluminum alloy, it is characterised in that: the weight percent including following component and each component are as follows:
Si 7.8-9.2%、Fe 0.7-1.0%、Cu 3.2-3.8%、Mn 0-0.5%、Mg 0.35-0.5%、Ni 0-0.5%、Zn 0.6-1.2%, Ti 0.1-0.2%, Pb 0-0.1%, Sn 0-0.35%, impurity 0-0.5%, remaining be Al.
2. a kind of preparation method of high strength die-casting aluminum alloy as described in claim 1, it is characterised in that: including following step It is rapid:
S1, melting: various raw materials are put into common concentrate in melting furnace or main frequency furnace and are fused into molten aluminum, are reached in temperature of aluminum liquid Slag making is carried out at 730-750 DEG C and takes off Slag treatment, and each chemical component of sample detection;
S2, molten aluminum processing: being added Ti alterant first in molten aluminum transhipment bag, and Ti is closed using the alterant aluminium titanium boron that content is 5% Gold, additional amount is by processing molten aluminum weight ratio 0.2-0.3% and preheats 20 minutes, it is ensured that aluminium titanium boron is in a molten state;By step S1 Obtained in molten aluminum be added into transhipment bag, in mass ratio addition the pure Mg block of 0.50-0.6%, to molten aluminum carry out argon gas rotation essence Refine degasification, it is ensured that the density of molten aluminum reaches 2.6g/cm3 or more, and Mg mass percent is 0.4-0.5%, and Ti mass percent is 0.1-0.2%;
S3 empties die casting machine side furnace in advance, and is heated to 850 DEG C -900 DEG C, and the step S2 molten aluminum handled well is transported to The die casting machine side furnace, and adjust temperature of aluminum liquid in the machine side furnace and stablize at 670-685 DEG C;
Compression mod is preheated to 200-220 DEG C, and stablizes mold temperature using die heater by S4, takes die casting after the completion of die casting Out, it is put into fire and quenches in 6S, water temperature is controlled at 40-50 DEG C;
S5 keeps the temperature die casting, and 188-192 DEG C of holding temperature, soaking time 5h;
S6 takes out die casting room temperature cooling.
CN201910526416.XA 2019-06-18 2019-06-18 A kind of high strength die-casting aluminum alloy and preparation method thereof Pending CN110257675A (en)

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