WO2023004850A1

WO2023004850A1 - Lightweight high-silicon aluminum alloy die casting member and preparation method therefor

Info

Publication number: WO2023004850A1
Application number: PCT/CN2021/110650
Authority: WO
Inventors: 陶诚; 米亚夫
Original assignee: 广东铭利达科技有限公司
Priority date: 2021-07-27
Filing date: 2021-08-04
Publication date: 2023-02-02
Also published as: CN113604712A

Abstract

A lightweight high-silicon aluminum alloy die casting member and a preparation method therefor, the ingredients comprising: Si, Mn, Cu, Ti, Al, Mg, Zn and a modifier. The parts by weight of each component are: 18-22 parts of Si, 0.1-0.2 part of Mn, 3-5 parts of Cu, 0.05-0.1 part of Ti, 65-70 parts of Al, and 0.45-0.6 part of Mg, 0.05-0.1 part of Zn and 0.2-0.4 part of the modifier. A boron-titanium flux, an SR813 phosphorus composite refiner and an SR814 phosphorus composite refiner are used to replace a sodium salt as a modifier for modification, helping prolong the effective time of modification treatment, while preventing the sodium salt from corroding production equipment so as to prolong the service life of the equipment. Heating and heat preservation are carried out on a quenched casting member, effectively eliminating the brittleness of the casting member. Argon is used in the process of heating and heat preservation for protection so as to prevent surface oxidation. The casting member is produced by using a pull-tab can and a waste aluminum product as raw materials, so that the production costs are reduced, and waste utilization is achieved, which is beneficial to environmental protection.

Description

A light-weight high-silicon aluminum alloy die-casting part and its preparation method

technical field

The invention relates to the technical field of high-silicon aluminum alloys, in particular to a lightweight high-silicon aluminum alloy die-casting and a preparation method thereof.

Background technique

High-silicon aluminum alloy is a binary alloy composed of silicon and aluminum. It is an alloy material mainly used in aerospace, space technology and portable electronic devices. High-silicon aluminum alloy has a wide range of applications, especially in the machinery manufacturing industry The application is very common. However, the silicon content in the existing national standard high-silicon aluminum alloys is mostly below 12%. This high-silicon aluminum alloy has low wear resistance, tensile strength and fatigue strength, which reduces the The quality of high-silicon aluminum alloy die castings, while increasing the silicon content can increase the strength of the alloy, but it will be accompanied by the precipitation of primary silicon. Generally, sodium salt is used as a modifier to inhibit the precipitation of primary silicon. However, the duration of the effect of sodium salt Short and highly corrosive, it will cause a certain degree of corrosion to the processing equipment, greatly shortening the service life of the equipment, and quenching is an essential step after the production of high-silicon aluminum alloy die castings is completed, but although quenching can increase the strength of the alloy , but at the same time greatly increases the brittleness of the alloy and reduces the strength of the casting to a certain extent.

Contents of the invention

The object of the present invention is to provide a light-weight high-silicon aluminum alloy die-casting and its preparation method, so as to solve the problems raised in the above-mentioned background technology.

In order to achieve the above object, the present invention provides the following technical solution: a lightweight high-silicon aluminum alloy die-casting, the formula includes: Si, Mn, Cu, Ti, Al, Mg, Zn and modifiers, the parts by weight of each component They are: 18-22 parts of Si, 0.1-0.2 parts of Mn, 3-5 parts of Cu, 0.05-0.1 parts of Ti, 65-70 parts of Al, 0.45-0.6 parts of Mg, 0.05-0.1 parts of Zn and 0.2-0.4 parts of modifier.

Preferably, the Al is discarded and recycled pop cans and aluminum products.

Preferably, the Si is industrial grade silicon and industrial diode silicon.

Preferably, the modifier is one or more mixtures of boron-titanium flux, SR813 phosphorus composite refiner and SR814 phosphorus composite refiner.

A method for preparing lightweight high-silicon aluminum alloy die-casting parts, comprising the following steps: Step 1, raw material weighing; Step 2, melting and mixing; Step 3, refining and removing impurities; Step 4, mold preheating; Step 5, pouring and casting Step 6, pressure-holding molding; Step 7, casting quenching; Step 8, heat preservation treatment; Step 9, surface treatment;

Wherein in the above step 1, according to the parts by weight of each component, 18-22 parts of Si, 0.1-0.2 parts of Mn, 3-5 parts of Cu, 0.05-0.1 parts of Ti, 65-70 parts of Ti, 65-70 parts of Part of Al, 0.45-0.6 part of Mg, 0.05-0.1 part of Zn and 0.2-0.4 part of modifier;

Wherein in the above-mentioned step two, a smelting furnace is used, and the Si weighed in step one is added to the smelting furnace for smelting, and then Mn, Cu, Ti, Al, Mg and Zn are sequentially added for smelting to make a molten metal Liquid standby;

Wherein in the above step three, add an appropriate amount of slag remover to the molten metal in step two to remove slag from the molten metal, then use a slag removal machine to remove the waste slag on the surface of the molten metal, repeat 2-3 times, Until there is no large amount of waste slag precipitated on the surface, then transfer the molten metal that has been deslagged into the transfer bag, pass in argon gas and add a refining agent for refining, and add the modified agent weighed in step 1 for modification after the refining is completed. After completion, it is injected into the holding furnace in the die-casting machine for standby;

Wherein in the above step 4, install the mold that needs to be die-casted on the die-casting machine, and then use the electric heating rod to preheat the mold, and use it for standby after the preheating is completed;

Wherein in the above step 5, the alloy melt after the metamorphic treatment of the heat preservation in the step 3 is injected into the preheated casting mold in the step 4, thereby completing the pouring of the casting;

Wherein in the above-mentioned step six, the liquid alloy injected in the step five has not yet been fully finalized, and the pressure of the mold is maintained until the casting is cooled and finalized, and the casting is taken out for use;

Wherein in the above step 7, the casting made in the step 6 is put into the heating furnace for heating, after the heating is completed, it is taken out and put into the quenching liquid for quenching, and after the quenching is completed, it is used for standby;

Among them, in the above step 8, the castings quenched in step 7 are put into the incubator, then the air in the incubator is discharged, and argon is introduced for protection, and then the casting is heated and kept, and after the heat preservation is completed, it is taken out and cooled. Reserve after reaching room temperature;

In the above step nine, deburring, trimming, grinding, decontamination and cleaning are performed on the cooled casting in step eight, so as to complete the production of lightweight high-silicon aluminum alloy die castings.

Preferably, in the second step, the melting temperature is 680-700° C., and the melting time is 10-20 minutes.

Preferably, in the third step, the refining temperature is 750-765° C., and the refining time is 10-15 minutes.

Preferably, in the third step, the temperature of the modification treatment is 825-835°C.

Preferably, in step 4, the mold preheating temperature is 150-200°C.

Preferably, in the eighth step, the holding temperature of the incubator is 650-670° C., and the holding time is 1-2 hours.

Compared with prior art, the beneficial effect of the present invention is:

1. The present invention utilizes boron-titanium flux, SR813 phosphorus composite refiner and SR814 phosphorus composite refiner to replace sodium salt as a modifier for modification, which is beneficial to prolong the effective time of modification treatment, refines the crystal structure, and improves the The wear resistance of the castings, while avoiding the corrosion of the production equipment by sodium salt, is beneficial to prolong the service life of the equipment;

2. The present invention heats and insulates the casting after quenching, effectively eliminates the brittleness of the casting, is beneficial to increase the strength of the casting, and uses argon for protection during the heating and heat preservation process, avoiding the situation of surface oxidation;

3. The formula of the present invention is reasonable and the process is simple, which greatly increases the structural strength and wear resistance of lightweight high-silicon aluminum alloy die-castings. At the same time, pop-top cans and discarded aluminum products are used as raw materials to produce castings, which is beneficial to reduce production costs and realize Waste utilization is conducive to protecting the environment.

Description of drawings

Fig. 1 is a flow chart of the method of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Please refer to Fig. 1, a kind of technical scheme provided by the present invention:

Example 1:

A lightweight high-silicon aluminum alloy die-casting, the formula includes: Si, Mn, Cu, Ti, Al, Mg, Zn and a modifier, the parts by weight of each component are: 18 parts of Si, 0.1 part of Mn , 3 parts of Cu, 0.05 parts of Ti, 65 parts of Al, 0.45 parts of Mg, 0.05 parts of Zn and 0.2 parts of modificant, and Al is waste recycling pop cans and aluminum products, Si is industrial grade silicon and One or two mixtures of industrial diode silicon, and the modifier is one or more mixtures of boron titanium flux, SR813 phosphorus composite refiner and SR814 phosphorus composite refiner.

Wherein in the above step 1, according to the parts by weight of each component, weigh 18 parts of Si, 0.1 parts of Mn, 3 parts of Cu, 0.05 parts of Ti, 65 parts of Al, 0.45 parts of Mg, 0.05 parts Parts of Zn and 0.2 parts of modifier;

Wherein in the above-mentioned step two, take the smelting furnace, add the Si weighed in the step 1 into the smelting furnace for smelting, then add Mn, Cu, Ti, Al, Mg and Zn in turn for smelting, and the smelting temperature is 700 ℃, the smelting time is 20min, and the molten metal is prepared for use;

In the above step three, add an appropriate amount of slag remover to the molten metal in step two to remove slag from the molten metal, and then use a slag remover to remove the waste slag on the surface of the molten metal, repeating 3 times until the surface Until no large amount of waste slag is precipitated, then transfer the molten metal that has been deslagged into the transfer bag, pass in argon gas and add refining agent for refining. The refining temperature is 750°C, and the refining time is 15 minutes. After refining, add step 1 The modificator weighed in is carried out metamorphic treatment, and the temperature of metamorphic treatment is 830 ℃, after metamorphic treatment is finished, pour into the holding furnace in the die-casting machine for standby;

Among them, in the above step 4, install the mold to be die-casted on the die-casting machine, and then use the electric heating rod to preheat the mold. The mold preheating temperature is 200°C, and it will be used after the preheating is completed;

Wherein in the above step five, the alloy melt after the metamorphic treatment in the step three is injected into the casting mold after the preheating in the step four, thereby completing the pouring of the casting;

Wherein in the above-mentioned step eight, the castings quenched in the step seven are dropped into the incubator, then the air in the incubator is discharged, and argon gas is passed into for protection, and then the casting is heated and insulated, and the insulated temperature of the incubator is 660°C, the holding time is 2 hours, after the holding is completed, take it out and cool it to room temperature for later use;

Example 2:

A lightweight high-silicon aluminum alloy die-casting, the formula includes: Si, Mn, Cu, Ti, Al, Mg, Zn and a modifier, the parts by weight of each component are: 20 parts of Si, 0.15 parts of Mn , 4 parts of Cu, 0.08 parts of Ti, 68 parts of Al, 0.5 parts of Mg, 0.08 parts of Zn and 0.3 parts of modificator, and Al is waste recycling pop cans and aluminum products, Si is industrial grade silicon and One or two mixtures of industrial diode silicon, and the modifier is one or more mixtures of boron titanium flux, SR813 phosphorus composite refiner and SR814 phosphorus composite refiner.

Wherein in the above step 1, according to the parts by weight of each component, weigh 20 parts of Si, 0.15 parts of Mn, 4 parts of Cu, 0.08 parts of Ti, 68 parts of Al, 0.5 parts of Mg, 0.08 parts of Parts of Zn and 0.3 parts of modifier;

In the above step three, add an appropriate amount of slag remover to the molten metal in step two to remove slag from the molten metal, and then use a slag remover to remove the waste slag on the surface of the molten metal, repeating 3 times until the surface Until no large amount of waste slag is precipitated, then transfer the molten metal that has been deslagged into the transfer bag, pass in argon gas and add refining agent for refining. The refining temperature is 760°C, and the refining time is 15 minutes. After refining, add step 1 The modificator weighed in is carried out metamorphic treatment, and the temperature of metamorphic treatment is 830 ℃, after metamorphic treatment is finished, pour into the holding furnace in the die-casting machine for standby;

Among them, in the above step 4, install the mold to be die-casted on the die-casting machine, and then use the electric heating rod to preheat the mold. The mold preheating temperature is 180°C, and it will be used after the preheating is completed;

Wherein in the above-mentioned step eight, the castings quenched in the step seven are dropped into the incubator, then the air in the incubator is discharged, and argon gas is passed into for protection, and then the casting is heated and insulated, and the insulated temperature of the incubator is 650°C, the holding time is 2 hours, after the holding is completed, take it out and cool it to room temperature for later use;

Example 3:

A lightweight high-silicon aluminum alloy die-casting, the formula includes: Si, Mn, Cu, Ti, Al, Mg, Zn and a modifier, the parts by weight of each component are: 22 parts of Si, 0.2 parts of Mn , 5 parts of Cu, 0.1 parts of Ti, 70 parts of Al, 0.6 parts of Mg, 0.1 parts of Zn and 0.4 parts of modificant, and Al is waste recycling pop cans and aluminum products, Si is industrial grade silicon and One or two mixtures of industrial diode silicon, and the modifier is one or more mixtures of boron titanium flux, SR813 phosphorus composite refiner and SR814 phosphorus composite refiner.

Wherein in the above step 1, according to the parts by weight of each component, weigh 22 parts of Si, 0.2 parts of Mn, 5 parts of Cu, 0.1 parts of Ti, 70 parts of Al, 0.6 parts of Mg, 0.1 parts Parts of Zn and 0.4 parts of modifier;

The properties of each embodiment are compared in the following table:

Based on the above, the high-silicon aluminum alloy die-casting produced by the present invention is light in weight, and its tensile strength and yield strength have been greatly improved, which is conducive to increasing the strength and quality of the casting, and at the same time uses pop-top cans and waste aluminum products as raw materials to produce Castings are beneficial to realize waste utilization, reduce production costs, and are beneficial to environmental protection. In the production process, boron-titanium flux, SR813 phosphorus composite refiner and SR814 phosphorus composite refiner are used to replace sodium salt for deterioration treatment, which prolongs the The time limit for deterioration treatment, while avoiding the corrosion of the equipment by sodium salt, is beneficial to prolong the service life of the equipment. After the casting is completed, the casting needs to be quenched, and the quenched casting is heated and kept under the protection of argon. It is beneficial to reduce the brittleness of castings.

It will be apparent to those skilled in the art that the invention is not limited to the details of the above-described exemplary embodiments, but that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Accordingly, the embodiments should be regarded in all points of view as exemplary and not restrictive, the scope of the invention being defined by the appended claims rather than the foregoing description, and it is therefore intended that the scope of the invention be defined by the appended claims rather than by the foregoing description. All changes within the meaning and range of equivalents of the elements are embraced in the present invention. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

A lightweight high-silicon aluminum alloy die-casting, the formula includes: Si, Mn, Cu, Ti, Al, Mg, Zn and a modifier, characterized in that: the parts by weight of each component are: 18-22 parts Si, 0.1-0.2 parts of Mn, 3-5 parts of Cu, 0.05-0.1 parts of Ti, 65-70 parts of Al, 0.45-0.6 parts of Mg, 0.05-0.1 parts of Zn and 0.2-0.4 parts of modified agent.
A light-weight high-silicon aluminum alloy die-casting according to claim 1, characterized in that: said Al is discarded and recycled pop cans and aluminum products.
A light-weight high-silicon aluminum alloy die-casting according to claim 1, wherein the Si is one or a mixture of industrial grade silicon and industrial diode silicon.
A light-weight high-silicon aluminum alloy die-casting according to claim 1, wherein the modifier is one or more of boron-titanium flux, SR813 phosphorus composite refiner, and SR814 phosphorus composite refiner mixture.
A method for preparing lightweight high-silicon aluminum alloy die-casting parts, comprising the following steps: Step 1, raw material weighing; Step 2, melting and mixing; Step 3, refining and removing impurities; Step 4, mold preheating; Step 5, pouring and casting Step 6, pressure-holding molding; Step 7, casting quenching; Step 8, heat preservation treatment; Step 9, surface treatment; It is characterized in that:

Wherein in the above step 1, according to the parts by weight of each component, 18-22 parts of Si, 0.1-0.2 parts of Mn, 3-5 parts of Cu, 0.05-0.1 parts of Ti, 65-70 parts of Ti, 65-70 parts of Part of Al, 0.45-0.6 part of Mg, 0.05-0.1 part of Zn and 0.2-0.4 part of modifier;

Wherein in the above-mentioned step two, a smelting furnace is used, and the Si weighed in step one is added to the smelting furnace for smelting, and then Mn, Cu, Ti, Al, Mg and Zn are sequentially added for smelting to make a molten metal Liquid standby;

Wherein in the above step three, add an appropriate amount of slag remover to the molten metal in step two to remove slag from the molten metal, then use a slag removal machine to remove the waste slag on the surface of the molten metal, repeat 2-3 times, Until there is no large amount of waste slag precipitated on the surface, then transfer the molten metal that has been deslagged into the transfer bag, pass in argon gas and add a refining agent for refining, and add the modified agent weighed in step 1 for modification after the refining is completed. After the metamorphic treatment is completed, it is injected into the holding furnace in the die-casting machine for standby;

Wherein in the above step 4, install the mold that needs to be die-casted on the die-casting machine, and then use the electric heating rod to preheat the mold, and use it for standby after the preheating is completed;

Wherein in the above step five, the alloy melt after the metamorphic treatment in the step three is injected into the casting mold after the preheating in the step four, thereby completing the pouring of the casting;

Wherein in the above-mentioned step six, the liquid alloy injected in the step five has not yet been fully finalized, and the pressure of the mold is maintained until the casting is cooled and finalized, and the casting is taken out for use;

Wherein in the above step 7, the casting made in the step 6 is put into the heating furnace for heating, after the heating is completed, it is taken out and put into the quenching liquid for quenching, and after the quenching is completed, it is used for standby;

Among them, in the above step 8, the castings quenched in step 7 are put into the incubator, then the air in the incubator is discharged, and argon is introduced for protection, and then the casting is heated and kept, and after the heat preservation is completed, it is taken out and cooled. Reserve after reaching room temperature;

In the above step nine, deburring, trimming, grinding, decontamination and cleaning are performed on the cooled casting in step eight, so as to complete the production of lightweight high-silicon aluminum alloy die castings.
The method for preparing a lightweight high-silicon aluminum alloy die-casting according to claim 5, characterized in that: in the second step, the melting temperature is 680-700° C., and the melting time is 10-20 minutes.
The method for preparing a lightweight high-silicon aluminum alloy die-casting according to claim 5, characterized in that: in the third step, the refining temperature is 750-765° C., and the refining time is 10-15 minutes.
The method for preparing a lightweight high-silicon aluminum alloy die-casting according to claim 5, characterized in that: in the third step, the temperature of the modification treatment is 825-835°C.
The method for preparing a lightweight high-silicon aluminum alloy die-casting according to claim 5, characterized in that in step 4, the mold preheating temperature is 150-200°C.
A method for preparing a lightweight high-silicon aluminum alloy die-casting according to claim 5, characterized in that: in the eighth step, the heat preservation temperature of the heat preservation box is 650-670° C., and the heat preservation time is 1-2 hours.