CN109182850A - A kind of preparation method of ultra-thin aluminum alloy back cover of motor - Google Patents

A kind of preparation method of ultra-thin aluminum alloy back cover of motor Download PDF

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Publication number
CN109182850A
CN109182850A CN201811116546.8A CN201811116546A CN109182850A CN 109182850 A CN109182850 A CN 109182850A CN 201811116546 A CN201811116546 A CN 201811116546A CN 109182850 A CN109182850 A CN 109182850A
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China
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preparation
aluminum alloy
back cover
motor
aluminum
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CN201811116546.8A
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CN109182850B (en
Inventor
金华君
顾成锋
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NINGBO JIALILAI MACHINERY MANUFACTURE CO Ltd
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NINGBO JIALILAI MACHINERY MANUFACTURE CO Ltd
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    • 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
    • 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00Making metallic powder or suspensions thereof
    • B22F9/02Making metallic powder or suspensions thereof using physical processes
    • B22F9/06Making metallic powder or suspensions thereof using physical processes starting from liquid material
    • B22F9/08Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
    • B22F9/082Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/10Alloys containing non-metals
    • C22C1/1036Alloys containing non-metals starting from a melt
    • 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
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/10Alloys containing non-metals
    • C22C1/1036Alloys containing non-metals starting from a melt
    • C22C2001/1047Alloys containing non-metals starting from a melt by mixing and casting liquid metal matrix composites

Abstract

The present invention relates to a kind of preparation methods of ultra-thin aluminum alloy back cover of motor, belong to technical field of aluminum alloy technology.Preparation method of the invention is the following steps are included: S1, by the component raw material heating melting of aluminium alloy be molten aluminum;S2, the aluminum alloy granule that particle size is 2-6 μm is made by spray-on process in molten aluminum, aluminum alloy granule is injected into mold and carries out compression casting molding to get back cover of motor finished product.It is not easy volume gas when preparation method die cast of the invention, reduces defects of die casting, improves cast-internal structure, improve product mechanical property.

Description

A kind of preparation method of ultra-thin aluminum alloy back cover of motor
Technical field
The invention belongs to technical field of aluminum alloy technology, are related to a kind of preparation method of ultra-thin aluminum alloy back cover of motor.
Background technique
Automobile motor rear cover is thin-wall part, is generally prepared using metal material, for motor assembly, back cover of motor makes With Al-alloy parts, the intensity and heat dissipation effect of back cover of motor can be enhanced, the weight of back cover of motor is reduced, meet automotive light weight technology It is required that aluminium alloy can melt down recycling, resource utilization can be improved.However since automobile motor rear cover is thin-wall part, for The molding of thin-wall part is the difficult point of Die Casting Industry for aluminium alloy, when conventional liquid casting forming, due to liquid aluminium liquid viscosity compared with Small, flow rate is larger.Easily with turbulent flow the type of flow shape, therefore drip molding easily exist hole, it is loose, segregation the defects of, To influence the internal structure and mechanical property of final products.
Summary of the invention
The purpose of the present invention is in view of the above-mentioned problems existing in the prior art, proposing, a kind of defect is few, mechanical property The preparation method of the good ultra-thin aluminum alloy back cover of motor of energy.
Object of the invention can be realized by the following technical scheme:
A kind of preparation method of ultra-thin aluminum alloy back cover of motor, the preparation method comprises the following steps:
S1, by the component raw material heating melting of aluminium alloy be molten aluminum;
S2, the aluminum alloy granule that particle size is 2-6 μm is made by spray-on process in molten aluminum, aluminum alloy granule is injected into Compression casting molding is carried out in mold to get back cover of motor finished product.
Using spray-on process first graininess is made in molten aluminum by the present invention, is then formed, is avoided using the method for compression casting Molten aluminum volume gas keeps cast structure fine and closely woven uniformly, defect and gross segregation are bright to effectively improve aluminium alloy internal microstructure It is aobvious to reduce, to improve the mechanical properties such as the intensity of product and mechanical performance.By the partial size of resulting aluminum alloy granule by spraying In 2-6 μm, gritty texture's form of dispersion is smashed and formed to the dendrite network skeleton for being conducive to be readily able to be formed for control, The column crystal and coarse dendrite in conventional casting are eliminated, cast-internal microstructure is further improved, makes cast-internal Fine microstructures, densification, are evenly distributed, to further improve properties of product.And mold filling temperature is low, extends die life; Simplify casting process, reduces energy consumption.
Preferably, aluminium alloy includes the component of following weight percent in the step S1: 10.0-13.0%Si ,≤ 0.70%Fe, 0.20-0.30%Cu ,≤0.40%Mn, 0.20-0.50%Mg, 0.30-0.60%Zn, 0.30-0.70%Ti, 0.08-0.2%C, surplus Al.
The present invention is improved on the basis of the trade mark is the aluminium alloy of ZL102, increases 0.08-0.2% C element, while increasing the usage amount of Ti element, during aluminum alloy melts, Ti can be with C, Al in-situ preparation disperse The TiC and TiAl of distribution3Phase has the function of refining crystal grain and anti-fading of refinement.The usage amount of Zn and Mg are increased simultaneously, are adjusted The usage amount of Cu is saved, to generate suitable Al2CuMg hardening constituent and MgZn2Hardening constituent, the two synergistic effect, thus effectively Improve the intensity of aluminium alloy.
Preferably, the weight ratio of Zn and Cu are less than 1.6 in the component of the step S1 aluminium alloy.
The present invention passes through the weight ratio of control Cu and Mg, to control Al2CuMg hardening constituent and MgZn2The generation of hardening constituent Ratio avoids generating excessive MgZn2Hardening constituent.Although MgZn2Hardening constituent to aluminium alloy have preferable invigoration effect, but Biggish dendrite easily generated when crystallisation by cooling increases the spraying at the difficulty compared with small particle of the viscosity of molten aluminum liquid, adds Big spraying energy consumption, is also unfavorable for the promotion of final products performance.
Preferably, molten aluminum also has addition molten aluminum weight percent 0.3-2% after heating melting in the step S1 Nano oxidized zirconium powder the step of.
Preferably, the partial size of the nano zircite is 10-30nm.
The nano zircite of the partial size can postpone the time that crystalline framework is formed when molten aluminum solidification, reduce crystallization temperature, Avoid molten aluminum premature solidification in spray process, it is difficult to be atomized, to be conducive to the partial size that control forms particle by spraying, improve spraying Efficiency reduces spray process energy consumption, and not applying lagging facility in spray process can be completed spray process.
Preferably, the step of component raw material heating melting of aluminium alloy is molten aluminum in the step S1 is that Al- is first added Then Si alloy is added aluminium ingot and Al-Mn intermediate alloy, is melted after being heated to 700-750 DEG C, to aluminium ingot melt portions Afterwards, Zn, Al-Ti intermediate alloy, graphite is added, aluminium ingot is cooled to 650-670 DEG C of addition Mg ﹑ Cu after melting substantially completely.
Preferably, the temperature of spraying aluminum alloy granule obtained is 520-560 DEG C in the step S2, the aluminium alloy Particle be made after immediately in 520-560 DEG C at a temperature of carry out compression casting molding.
The present invention will directly carry out compression casting molding after aluminum alloy granule is made by spraying, and by the temperature of compression casting Control, on the one hand since under the conditions of the temperature, there are micro liquid phase states for aluminum alloy granule, has certain at 520-560 DEG C Viscosity, be easier to die cast, can help to reduce energy consumption;On the other hand because liquid phase state only has micro (less than 5wt%), energy The refinement crystal grain formed through nebulization excessive grain during compression casting is enough avoided to grow up, to form lesser matrix Crystal grain is organized, improves the microstructure of casting, and then improve the mechanical property of casting.
Preferably, the pressure of compression casting is 90-130MPa, pressing time 130-180s in the step S2.
Preferably, the step of step S2 also has and then is heat-treated after die cast.
Preferably, the heat treatment in the step S2 includes solution treatment and ageing treatment, the temperature of the solution treatment Degree is 500 ± 5 DEG C, solution time 1-2h, and the temperature of ageing treatment is 235 ± 5 DEG C, aging time 2-6h.
Traditional die-casting process is since molten aluminum is easy to involve in gas, to make to generate stomata, these stomatas in casting after forming Can expand when being heat-treated causes stomata to increase, and reduces the performance of casting.Preparation method of the invention is not easy to wrap up in gas, casting Inside aperture number is few, dense structure, and when heat treatment will not cause air porous expanded, therefore can carry out heat treatment and improves casting Performance.
Compared with prior art, the invention has the following advantages: Die-Casting is not easy volume gas when forming, reduce pressure Cast defect, improve cast-internal structure, and make die casting after die cast can further progress heat treatment, improve The mechanical property of final products.Simultaneously by optimization aluminium alloy formula, so that being sprayed for molten aluminum is easy to carry out, low energy consumption, spraying Effect is good.
Specific embodiment
The following is specific embodiments of the present invention, and technical scheme of the present invention will be further described, but the present invention is simultaneously It is not limited to these embodiments.
Embodiment 1
In the present embodiment ultra-thin aluminum alloy back cover of motor preparation method the following steps are included:
(1) melting molten aluminum: according to the aluminium alloy preparation raw material with following weight percent composition: 11.0%Si, 0.50%Fe, 0.25%Cu, 0.30%Mn, 0.40%Mg, 0.35%Zn, 0.50%Ti, 0.13%C, surplus Al;First it is added Then Al-Si alloy is added aluminium ingot and Al-Mn intermediate alloy, is melted after being heated to 730 DEG C, after aluminium ingot melt portions, Zn, Al-Ti intermediate alloy, graphite is added, aluminium ingot is cooled to 660 DEG C of addition Mg ﹑ Cu after melting substantially completely, is eventually adding molten aluminum The particle diameter distribution of the nano oxidized zirconium powder of weight percent 1.2%, nano zircite is 10-30nm, is stirred evenly.
(2) die cast: being made the aluminum alloy granule that particle size distribution is 2-6 μm by spray-on process for molten aluminum, spraying The temperature of aluminum alloy granule obtained is 535 DEG C, aluminum alloy granule is injected into mold adds at a temperature of 535 DEG C immediately after Casting and forming is pressed, the pressure of compression casting is 110MPa, pressing time 150s.
(3) it is heat-treated: the molding blank of compression casting is cooled to 500 DEG C of progress solution treatment 1.5h, then cool down 235 DEG C carry out ageing treatment 4h to get back cover of motor finished product.
Embodiment 2
In the present embodiment ultra-thin aluminum alloy back cover of motor preparation method the following steps are included:
(1) melting molten aluminum: according to the aluminium alloy preparation raw material with following weight percent composition: 11.0%Si, 0.50%Fe, 0.25%Cu, 0.30%Mn, 0.40%Mg, 0.35%Zn, 0.50%Ti, 0.13%C, surplus Al;First it is added Then Al-Si alloy is added aluminium ingot and Al-Mn intermediate alloy, is melted after being heated to 700 DEG C, after aluminium ingot melt portions, Zn, Al-Ti intermediate alloy, graphite is added, aluminium ingot is cooled to 650 DEG C of addition Mg ﹑ Cu after melting substantially completely, is eventually adding molten aluminum The partial size of the nano oxidized zirconium powder of weight percent 0.3%, nano zircite is 10-30nm, is stirred evenly.
(2) die cast: being made the aluminum alloy granule that particle size is 2-6 μm by spray-on process for molten aluminum, spraying to be made Aluminum alloy granule temperature be 520 DEG C, immediately after by aluminum alloy granule be injected into mold at a temperature of 520 DEG C pressurize cast Type is caused, the pressure of compression casting is 130MPa, pressing time 130s.
(3) it is heat-treated: the molding blank of compression casting is cooled to 500 DEG C of progress solution treatment 1.5h, then cool down 235 DEG C carry out ageing treatment 4h to get back cover of motor finished product.
Embodiment 3
In the present embodiment ultra-thin aluminum alloy back cover of motor preparation method the following steps are included:
(1) melting molten aluminum: according to the aluminium alloy preparation raw material with following weight percent composition: 11.0%Si, 0.50%Fe, 0.25%Cu, 0.30%Mn, 0.40%Mg, 0.35%Zn, 0.50%Ti, 0.13%C, surplus Al;First it is added Then Al-Si alloy is added aluminium ingot and Al-Mn intermediate alloy, is melted after being heated to 750 DEG C, after aluminium ingot melt portions, Zn, Al-Ti intermediate alloy, graphite is added, aluminium ingot is cooled to 670 DEG C of addition Mg ﹑ Cu after melting substantially completely, is eventually adding molten aluminum The partial size of the nano oxidized zirconium powder of weight percent 2%, nano zircite is 10-30nm, is stirred evenly.
(2) die cast: being made the aluminum alloy granule that particle size is 2-6 μm by spray-on process for molten aluminum, spraying to be made Aluminum alloy granule temperature be 560 DEG C, immediately after by aluminum alloy granule be injected into mold at a temperature of 560 DEG C pressurize cast Type is caused, the pressure of compression casting is 90MPa, pressing time 180s.
(3) it is heat-treated: the molding blank of compression casting is cooled to 500 DEG C of progress solution treatment 1.5h, then cool down 235 DEG C carry out ageing treatment 4h to get back cover of motor finished product.
Embodiment 4
Aluminium alloy have following weight percent component: 10.0%Si, 0.50%Fe, 0.20%Cu, 0.30%Mn, 0.20%Mg, 0.30%Zn, 0.30%Ti, 0.08%C, surplus Al, other are same as Example 1.
Embodiment 5
Aluminium alloy have following weight percent component: 13.0%Si, 0.70%Fe, 0.30%Cu, 0.40%Mn, 0.50%Mg, 0.48%Zn, 0.70%Ti, 0.2%C, surplus Al, other are same as Example 1.
Comparative example 1
The partial size of spraying resulting aluminum alloy granule is 8-12 μm, other are same as Example 1.
Comparative example 2
In aluminium alloy component, the weight percent of Zn is 0.45%, other are same as Example 1.
Comparative example 3
The temperature of compression casting is at 600 DEG C, other are same as Example 1.
Comparative example 4
Nano oxidized zirconium powder is not added after heating melting for molten aluminum, and aluminium alloy component and spray art are same as Example 1.
Comparative example 5
The particle diameter distribution for the nano oxidized zirconium powder that molten aluminum is added after heating melting is 30-50nm, aluminium alloy component and spray Mist technique is same as Example 1.
The performance of product obtained in 1-5 of the embodiment of the present invention, comparative example 1-3 is compared, comparison result such as 1 institute of table Show.
Table 1: the comparison of the performance of product obtained in embodiment 1-5, comparative example 1-3
Comparative example 4 and comparative example 5 under the conditions of spray art similarly to Example 1, part molten aluminum before atomization There is the sign of solidification, can not be all atomized, atomizing effect is poor.
In conclusion the present invention carries out reasonable compatibility by the component to aluminium alloy used in back cover of motor, and cooperate specific Preparation method, effectively increase the mechanical property of back cover of motor.
Specific embodiment described herein is only an example for the spirit of the invention.The neck of technology belonging to the present invention The technical staff in domain can make various modifications or additions to the described embodiments or replace by a similar method In generation, however, it does not deviate from the spirit of the invention or beyond the scope of the appended claims.

Claims (8)

1. a kind of preparation method of ultra-thin aluminum alloy back cover of motor, which is characterized in that the preparation method comprises the following steps:
S1, by the component raw material heating melting of aluminium alloy be molten aluminum;
S2, the aluminum alloy granule that particle size is 2-6 μm is made by spray-on process in molten aluminum, aluminum alloy granule is injected into mold Middle progress compression casting molding is to get back cover of motor finished product.
2. preparation method according to claim 1, which is characterized in that aluminium alloy includes following weight hundred in the step S1 Point component: 10.0-13.0%Si ,≤0.70%Fe, 0.20-0.30%Cu ,≤0.40%Mn, 0.20-0.50%Mg, 0.30-0.60%Zn, 0.30-0.70%Ti, 0.08-0.2%C, surplus Al.
3. preparation method according to claim 2, which is characterized in that in the component of the step S1 aluminium alloy, Zn and Cu Weight ratio less than 1.6.
4. preparation method according to claim 1, which is characterized in that molten aluminum also has after heating melting in the step S1 There is the step of nano oxidized zirconium powder that molten aluminum weight percent 0.3-2% is added.
5. the preparation method according to claim 4, which is characterized in that the partial size of the nano zircite is 10-30nm.
6. preparation method according to claim 1, which is characterized in that spraying aluminum alloy granule obtained in the step S2 Temperature be 520-560 DEG C, the aluminum alloy granule be made after immediately in 520-560 DEG C at a temperature of carry out compression casting at Type.
7. preparation method according to claim 1, which is characterized in that the pressure of compression casting is 90- in the step S2 130MPa, pressing time 130-180s.
8. preparation method according to claim 1, which is characterized in that then the step S2 also has after die cast The step of being heat-treated.
CN201811116546.8A 2018-09-25 2018-09-25 A kind of preparation method of ultra-thin aluminum alloy back cover of motor Active CN109182850B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1453080A (en) * 2003-05-29 2003-11-05 上海交通大学 Method of manufacturing large precise irregular pipe
CN104259418A (en) * 2014-09-23 2015-01-07 珠海市润星泰电器有限公司 Die-casting process method for semi-solid state metal die-cast formation
CN104889360A (en) * 2015-05-22 2015-09-09 昆明理工大学 Method and device for preparing large wallboard profile
CN106591638A (en) * 2015-10-19 2017-04-26 通用汽车环球科技运作有限责任公司 New high pressure die casting aluminum alloy for high temperature and corrosive applications
CN107716918A (en) * 2017-09-21 2018-02-23 北京宝航新材料有限公司 A kind of AlSi10Mg dusty materials and preparation method thereof and its application

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1453080A (en) * 2003-05-29 2003-11-05 上海交通大学 Method of manufacturing large precise irregular pipe
CN104259418A (en) * 2014-09-23 2015-01-07 珠海市润星泰电器有限公司 Die-casting process method for semi-solid state metal die-cast formation
CN104889360A (en) * 2015-05-22 2015-09-09 昆明理工大学 Method and device for preparing large wallboard profile
CN106591638A (en) * 2015-10-19 2017-04-26 通用汽车环球科技运作有限责任公司 New high pressure die casting aluminum alloy for high temperature and corrosive applications
CN107716918A (en) * 2017-09-21 2018-02-23 北京宝航新材料有限公司 A kind of AlSi10Mg dusty materials and preparation method thereof and its application

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