CN110656256A - Aluminum casting machining process - Google Patents
Aluminum casting machining process Download PDFInfo
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- CN110656256A CN110656256A CN201910956712.3A CN201910956712A CN110656256A CN 110656256 A CN110656256 A CN 110656256A CN 201910956712 A CN201910956712 A CN 201910956712A CN 110656256 A CN110656256 A CN 110656256A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B14/00—Crucible or pot furnaces
- F27B14/08—Details peculiar to crucible or pot furnaces
- F27B14/14—Arrangements of heating devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D27/00—Stirring devices for molten material
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Abstract
The invention provides a processing technology of an aluminum casting, which relates to the field of aluminum castings and comprises the following steps: (S1) charging, (S2) melting, (S3) stirring, (S4) slagging, (S5) refining and (S6) discharging and cleaning. According to the invention, by designing the processing technology of the aluminum casting, the heat preservation device is arranged on the outer side of the smelting furnace and is divided into three layers, the inner layer is a high-temperature-resistant heat preservation inner shell, the outer layer is a high-temperature-resistant heat preservation outer shell, and the middle layer is a heat preservation layer, so that the high temperature in the smelting furnace can be prevented from being scattered outwards to influence the melting efficiency; in the stirring process, the inner scraper can contact the bottom of the furnace body, the outer scraper can contact the inner wall of the furnace body, the inside of the furnace body can be fully stirred in an all-around mode, residual materials on the furnace wall can be removed, the stirring efficiency is improved, and the working time is saved.
Description
Technical Field
The invention relates to the field of aluminum castings, in particular to a processing technology of an aluminum casting.
Background
The cast aluminum is a technological method that the aluminum in a molten state is poured into a mould and cooled to form an aluminum piece with a required shape. The cast article obtained by casting aluminum is referred to as an aluminum casting.
During the casting forming process of the cast aluminum part, defects such as internal porosity, shrinkage cavity, air hole and the like are easily generated, and after the cast containing the defects is machined, the surface dense layer part is removed to expose internal structure defects. When a pressure-tight sealing test is carried out on automobile cast aluminum parts with sealing requirements, such as a cylinder body, a cylinder cover, an intake manifold, a brake valve body and the like, the existence of defective micropores can cause leakage of sealing media to cause a large amount of waste products, and the defects can be discovered only after pressure test after machining, so that serious waves of working hours, raw materials and energy are caused. In order to solve the problem of high rejection rate of automobile aluminum castings and save castings which are possibly scrapped due to the defects, certain treatment measures are required in production, and currently, the most common technology is infiltration treatment, namely plugging. The "infiltration" is a process technology in which an infiltrant is infiltrated into the micropores of an aluminum casting under certain conditions, and the filler infiltrated into the pores is integrated with the inner walls of the pores of the casting after solidification to block the micropores, so that the part can meet the conditions of pressurization, seepage prevention, leakage prevention and the like.
However, the existing aluminum casting processing technology has some defects, the traditional aluminum casting needs to be in a smelting furnace and is appointed to be in a required high-temperature range in the process of melting the aluminum alloy, but the high temperature in the smelting furnace is scattered, so that the high-temperature range in the smelting furnace can be influenced, the melting efficiency and the melting effect of the aluminum alloy are further influenced, and the defects of uneven stirring and incomplete stirring exist in the process of melting and stirring the aluminum alloy, so the invention provides the aluminum casting processing technology according to the problems.
Disclosure of Invention
The invention aims to provide a processing technology of an aluminum casting to solve the technical problem.
In order to solve the technical problems, the invention adopts the following technical scheme:
a processing technology of an aluminum casting comprises an aluminum alloy, wherein the aluminum alloy comprises pure aluminum and inevitable impurities thereof, and the purity of the aluminum is more than 99%, and the processing technology is characterized in that: the method specifically comprises the following steps:
(S1) charging: firstly, uniformly placing aluminum blocks with small aluminum alloy volume into the bottom of a smelting furnace, then uniformly placing aluminum blocks with large aluminum alloy volume into the middle-lower layer position of the smelting furnace, and finally uniformly placing aluminum blocks with moderate aluminum alloy volume into the middle-upper layer position of the smelting furnace, so that the aluminum alloy is tiled into the smelting furnace in three layers;
(S2) melting: before heating, a ring winding type heat preservation mechanism is fixed on the outer side of the smelting furnace through a fastening device, and the heat preservation mechanism comprises a heat preservation outer shell, a heat preservation sealing gasket and a heat preservation inner shell, so that the temperature in the smelting furnace is prevented from being excessively dispersed;
then, heating and smelting the whole smelting furnace through a built-in heating mechanism of the smelting furnace, controlling the temperature in the smelting furnace to be between 720 and 750 ℃, heating for a period of time, and adding a powdery covering agent into the smelting furnace to uniformly cover the aluminum alloy after the aluminum alloy in the furnace body is softened so as to prevent the aluminum alloy from being oxidized;
(S3) stirring: the aluminum alloy added with the covering agent needs to be stirred by a stirring device, the scraping plates are arranged into an inner layer and an outer layer in the stirring process, the outer layer scraping plate is of an inner arc structure, the outer side of the outer scraping plate can contact the inner wall of the furnace body, the inner layer scraping plate is of an outer arc structure, and the bottom of the inner scraping plate is in contact with the bottom of the furnace body, so that the aluminum alloy and the covering agent thereof are fully stirred, melting is accelerated, and local overheating is prevented;
(S4) slagging-off: standing on the basis of the step (S3), after standing for 30-40min, carrying out slag skimming treatment on the aluminum alloy, and in the slag skimming process, carefully skimming from one side to the other side through special equipment in a stable environment, preventing slag from being involved into the aluminum alloy and preventing aluminum alloy mixing;
(S5) refining: after the molten material in the step (S4) is cooled, and the molten material is moved to a standing furnace for refining after the temperature is appropriate, the molten material is refined to obtain pure molten material;
(S6) discharging and cleaning: the smelting pot after the melt is taken out needs to be cleaned, and in the process of cleaning the smelting pot, the inner wall and the bottom of the smelting pot body can be cleaned through the stirring device, so that the melt residue in the smelting pot body is prevented.
Preferably, the aluminum alloy has an aluminum content of 99% or more and other impurity elements content of 1% or less.
Preferably, in the process of fixing the heat preservation mechanism in the melting (S2), the method specifically includes the following steps:
(1) firstly, fixing the heat-preservation inner shell by a fastening device, wherein the fastening device can be a high-temperature-resistant bolt, a screw rod and the like, and the heat-preservation inner shell is made of a high-temperature-resistant material;
(2) then winding the heat-insulating layer on the outer side of the heat-insulating inner shell, wherein the thickness of the heat-insulating layer is 3-5 cm;
(3) and finally, winding the heat-insulating outer shell on the outer side of the heat-insulating layer through a fastening device, fixing the heat-insulating outer shell through the fastening device, wherein the fastening device can be a high-temperature-resistant bolt, a screw rod and the like, and the heat-insulating inner shell is made of a high-temperature-resistant material, and the fastening device of the heat-insulating inner shell and the fastening device of the heat-insulating outer shell are not on the same horizontal plane.
Preferably, the temperature for refining in the step (S5) is between 800 and 850 ℃.
Preferably, the refining time in the step (S5) is 20 to 30 min.
Preferably, during the slag removing process in the step (S4), special equipment is needed to carry out spiral type slag removing from one side of the top to the other side of the top, so as to remove the slag completely.
The invention has the beneficial effects that:
the invention designs a processing technology of the cast aluminum part, and the following advantages are achieved:
1: the heat preservation device is arranged on the outer side of the smelting furnace and is divided into three layers, the inner layer is a high-temperature-resistant heat preservation inner shell, the outer layer is a high-temperature-resistant heat preservation outer shell, and the middle layer is a heat preservation layer, so that the high temperature in the smelting furnace can be prevented from being scattered outwards to influence the melting efficiency;
2: in the stirring process, the stirring rod is divided into an inner scraper and an outer scraper, the inner scraper can contact the bottom of the furnace body, the outer scraper can contact the inner wall of the furnace body, so that the inside of the furnace body can be fully stirred in all directions during stirring, and the residual materials on the furnace wall can be removed, so that the stirring efficiency is improved, and the working time is saved;
3: in the process of slagging off, the special equipment is used for spirally slagging off from one side to the other side, and slagging off can be more uniform and comprehensive through the arrangement, the slag can be prevented from being involved in the aluminum alloy solvent, and the slagging off effect is better.
Detailed Description
The present invention will be further described with reference to specific embodiments for the purpose of facilitating an understanding of technical means, characteristics of creation, objectives and functions realized by the present invention, but the following embodiments are only preferred embodiments of the present invention, and are not intended to be exhaustive. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative efforts belong to the protection scope of the present invention. The experimental methods in the following examples are conventional methods unless otherwise specified, and materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
Example 1
A processing technology of an aluminum casting comprises an aluminum alloy, wherein the aluminum alloy comprises pure aluminum and inevitable impurities thereof, and the purity of the aluminum is more than 99%, and the processing technology is characterized in that: the method specifically comprises the following steps:
(S1) charging: firstly, uniformly placing aluminum blocks with small aluminum alloy volume into the bottom of a smelting furnace, then uniformly placing aluminum blocks with large aluminum alloy volume into the middle-lower layer position of the smelting furnace, and finally uniformly placing aluminum blocks with moderate aluminum alloy volume into the middle-upper layer position of the smelting furnace, so that the aluminum alloy is tiled into the smelting furnace in three layers;
(S2) melting: before heating, a ring winding type heat preservation mechanism is fixed on the outer side of the smelting furnace through a fastening device, and the heat preservation mechanism comprises a heat preservation outer shell, a heat preservation sealing gasket and a heat preservation inner shell, so that the temperature in the smelting furnace is prevented from being excessively dispersed;
then, heating and smelting the whole smelting furnace through a built-in heating mechanism of the smelting furnace, controlling the temperature in the smelting furnace to be between 720 and 750 ℃, heating for a period of time, and adding a powdery covering agent into the smelting furnace to uniformly cover the aluminum alloy after the aluminum alloy in the furnace body is softened so as to prevent the aluminum alloy from being oxidized;
(S3) stirring: the aluminum alloy added with the covering agent needs to be stirred by a stirring device, the scraping plates are arranged into an inner layer and an outer layer in the stirring process, the outer layer scraping plate is of an inner arc structure, the outer side of the outer scraping plate can contact the inner wall of the furnace body, the inner layer scraping plate is of an outer arc structure, and the bottom of the inner scraping plate is in contact with the bottom of the furnace body, so that the aluminum alloy and the covering agent thereof are fully stirred, melting is accelerated, and local overheating is prevented;
(S4) slagging-off: standing on the basis of the step (S3), after standing for 30-40min, carrying out slag skimming treatment on the aluminum alloy, and in the slag skimming process, carefully skimming from one side to the other side through special equipment in a stable environment, preventing slag from being involved into the aluminum alloy and preventing aluminum alloy mixing;
(S5) refining: after the molten material in the step (S4) is cooled, and the molten material is moved to a standing furnace for refining after the temperature is appropriate, the molten material is refined to obtain pure molten material;
(S6) discharging and cleaning: the smelting pot after the melt is taken out needs to be cleaned, and in the process of cleaning the smelting pot, the inner wall and the bottom of the smelting pot body can be cleaned through the stirring device, so that the melt residue in the smelting pot body is prevented.
Example 2
A processing technology of an aluminum casting comprises an aluminum alloy, wherein the aluminum alloy comprises pure aluminum and inevitable impurities thereof, and the purity of the aluminum is more than 99%, and the processing technology is characterized in that: the method specifically comprises the following steps:
(S1) charging: firstly, uniformly placing aluminum blocks with small aluminum alloy volume into the bottom of a smelting furnace, then uniformly placing aluminum blocks with large aluminum alloy volume into the middle-lower layer position of the smelting furnace, and finally uniformly placing aluminum blocks with moderate aluminum alloy volume into the middle-upper layer position of the smelting furnace, so that the aluminum alloy is tiled into the smelting furnace in three layers;
(S2) melting: before heating, a ring winding type heat preservation mechanism is fixed on the outer side of the smelting furnace through a fastening device, and the heat preservation mechanism comprises a heat preservation outer shell, a heat preservation sealing gasket and a heat preservation inner shell, so that the temperature in the smelting furnace is prevented from being excessively dispersed;
then, heating and smelting the whole smelting furnace through a built-in heating mechanism of the smelting furnace, controlling the temperature in the smelting furnace to be between 720 and 750 ℃, heating for a period of time, and adding a powdery covering agent into the smelting furnace to uniformly cover the aluminum alloy after the aluminum alloy in the furnace body is softened so as to prevent the aluminum alloy from being oxidized;
(S3) stirring: the aluminum alloy added with the covering agent needs to be stirred by a stirring device, the scraping plates are arranged into an inner layer and an outer layer in the stirring process, the outer layer scraping plate is of an inner arc structure, the outer side of the outer scraping plate can contact the inner wall of the furnace body, the inner layer scraping plate is of an outer arc structure, and the bottom of the inner scraping plate is in contact with the bottom of the furnace body, so that the aluminum alloy and the covering agent thereof are fully stirred, melting is accelerated, and local overheating is prevented;
(S4) slagging-off: standing on the basis of the step (S3), after standing for 30-40min, carrying out slag skimming treatment on the aluminum alloy, and in the slag skimming process, carefully skimming from one side to the other side through special equipment in a stable environment, preventing slag from being involved into the aluminum alloy and preventing aluminum alloy mixing;
(S5) refining: after the molten material in the step (S4) is cooled, and the molten material is moved to a standing furnace for refining after the temperature is appropriate, the molten material is refined to obtain pure molten material;
(S6) discharging and cleaning: the smelting pot after the melt is taken out needs to be cleaned, and in the process of cleaning the smelting pot, the inner wall and the bottom of the smelting pot body can be cleaned through the stirring device, so that the melt residue in the smelting pot body is prevented.
In the process of fixing the heat preservation mechanism in the melting process (S2), the method specifically comprises the following steps:
(1) firstly, fixing the heat-preservation inner shell by a fastening device, wherein the fastening device can be a high-temperature-resistant bolt, a screw rod and the like, and the heat-preservation inner shell is made of a high-temperature-resistant material;
(2) then winding the heat-insulating layer on the outer side of the heat-insulating inner shell, wherein the thickness of the heat-insulating layer is 3-5 cm;
(3) and finally, winding the heat-insulating outer shell on the outer side of the heat-insulating layer through a fastening device, fixing the heat-insulating outer shell through the fastening device, wherein the fastening device can be a high-temperature-resistant bolt, a screw rod and the like, and the heat-insulating inner shell is made of a high-temperature-resistant material, and the fastening device of the heat-insulating inner shell and the fastening device of the heat-insulating outer shell are not on the same horizontal plane.
In the process of fixing the heat preservation mechanism in the melting process (S2), the method specifically comprises the following steps:
(1) firstly, fixing the heat-preservation inner shell by a fastening device, wherein the fastening device can be a high-temperature-resistant bolt, a screw rod and the like, and the heat-preservation inner shell is made of a high-temperature-resistant material;
(2) then winding the heat-insulating layer on the outer side of the heat-insulating inner shell, wherein the thickness of the heat-insulating layer is 3-5 cm;
(3) and finally, winding the heat-insulating outer shell on the outer side of the heat-insulating layer through a fastening device, fixing the heat-insulating outer shell through the fastening device, wherein the fastening device can be a high-temperature-resistant bolt, a screw rod and the like, and the heat-insulating inner shell is made of a high-temperature-resistant material, and the fastening device of the heat-insulating inner shell and the fastening device of the heat-insulating outer shell are not on the same horizontal plane.
Example 3
A processing technology of an aluminum casting comprises an aluminum alloy, wherein the aluminum alloy comprises pure aluminum and inevitable impurities thereof, and the purity of the aluminum is more than 99%, and the processing technology is characterized in that: the method specifically comprises the following steps:
(S1) charging: firstly, uniformly placing aluminum blocks with small aluminum alloy volume into the bottom of a smelting furnace, then uniformly placing aluminum blocks with large aluminum alloy volume into the middle-lower layer position of the smelting furnace, and finally uniformly placing aluminum blocks with moderate aluminum alloy volume into the middle-upper layer position of the smelting furnace, so that the aluminum alloy is tiled into the smelting furnace in three layers;
(S2) melting: before heating, a ring winding type heat preservation mechanism is fixed on the outer side of the smelting furnace through a fastening device, and the heat preservation mechanism comprises a heat preservation outer shell, a heat preservation sealing gasket and a heat preservation inner shell, so that the temperature in the smelting furnace is prevented from being excessively dispersed;
then, heating and smelting the whole smelting furnace through a built-in heating mechanism of the smelting furnace, controlling the temperature in the smelting furnace to be between 720 and 750 ℃, heating for a period of time, and adding a powdery covering agent into the smelting furnace to uniformly cover the aluminum alloy after the aluminum alloy in the furnace body is softened so as to prevent the aluminum alloy from being oxidized;
(S3) stirring: the aluminum alloy added with the covering agent needs to be stirred by a stirring device, the scraping plates are arranged into an inner layer and an outer layer in the stirring process, the outer layer scraping plate is of an inner arc structure, the outer side of the outer scraping plate can contact the inner wall of the furnace body, the inner layer scraping plate is of an outer arc structure, and the bottom of the inner scraping plate is in contact with the bottom of the furnace body, so that the aluminum alloy and the covering agent thereof are fully stirred, melting is accelerated, and local overheating is prevented;
(S4) slagging-off: standing on the basis of the step (S3), after standing for 30-40min, carrying out slag skimming treatment on the aluminum alloy, and in the slag skimming process, carefully skimming from one side to the other side through special equipment in a stable environment, preventing slag from being involved into the aluminum alloy and preventing aluminum alloy mixing;
(S5) refining: after the molten material in the step (S4) is cooled, and the molten material is moved to a standing furnace for refining after the temperature is appropriate, the molten material is refined to obtain pure molten material;
(S6) discharging and cleaning: the smelting pot after the melt is taken out needs to be cleaned, and in the process of cleaning the smelting pot, the inner wall and the bottom of the smelting pot body can be cleaned through the stirring device, so that the melt residue in the smelting pot body is prevented.
In the process of fixing the heat preservation mechanism in the melting process (S2), the method specifically comprises the following steps:
(1) firstly, fixing the heat-preservation inner shell by a fastening device, wherein the fastening device can be a high-temperature-resistant bolt, a screw rod and the like, and the heat-preservation inner shell is made of a high-temperature-resistant material;
(2) then winding the heat-insulating layer on the outer side of the heat-insulating inner shell, wherein the thickness of the heat-insulating layer is 3-5 cm;
(3) and finally, winding the heat-insulating outer shell on the outer side of the heat-insulating layer through a fastening device, fixing the heat-insulating outer shell through the fastening device, wherein the fastening device can be a high-temperature-resistant bolt, a screw rod and the like, and the heat-insulating inner shell is made of a high-temperature-resistant material, and the fastening device of the heat-insulating inner shell and the fastening device of the heat-insulating outer shell are not on the same horizontal plane.
The aluminum alloy contains aluminum in an amount of 99% or more and other impurity elements in an amount of 1% or less. The temperature of refining in the step (S5) is between 800 and 850 ℃. The refining time in the step (S5) is 20-30 min. In the slag removing process in the step (S4), special equipment is needed to remove the slag completely by spirally removing the slag from one side of the top to the other side of the top.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A processing technology of an aluminum casting comprises an aluminum alloy, wherein the aluminum alloy comprises pure aluminum and inevitable impurities thereof, and the purity of the aluminum is more than 99%, and the processing technology is characterized in that: the method specifically comprises the following steps:
(S1) charging: firstly, uniformly placing aluminum blocks with small aluminum alloy volume into the bottom of a smelting furnace, then uniformly placing aluminum blocks with large aluminum alloy volume into the middle-lower layer position of the smelting furnace, and finally uniformly placing aluminum blocks with moderate aluminum alloy volume into the middle-upper layer position of the smelting furnace, so that the aluminum alloy is tiled into the smelting furnace in three layers;
(S2) melting: before heating, a ring winding type heat preservation mechanism is fixed on the outer side of the smelting furnace through a fastening device, and the heat preservation mechanism comprises a heat preservation outer shell, a heat preservation sealing gasket and a heat preservation inner shell, so that the temperature in the smelting furnace is prevented from being excessively dispersed; then, heating and smelting the whole smelting furnace through a built-in heating mechanism of the smelting furnace, controlling the temperature in the smelting furnace to be between 720 and 750 ℃, heating for a period of time, and adding a powdery covering agent into the smelting furnace to uniformly cover the aluminum alloy after the aluminum alloy in the furnace body is softened so as to prevent the aluminum alloy from being oxidized;
(S3) stirring: the aluminum alloy added with the covering agent needs to be stirred by a stirring device, the scraping plates are arranged into an inner layer and an outer layer in the stirring process, the outer layer scraping plate is of an inner arc structure, the outer side of the outer scraping plate can contact the inner wall of the furnace body, the inner layer scraping plate is of an outer arc structure, and the bottom of the inner scraping plate is in contact with the bottom of the furnace body, so that the aluminum alloy and the covering agent thereof are fully stirred, melting is accelerated, and local overheating is prevented;
(S4) slagging-off: standing on the basis of the step (S3), after standing for 30-40min, carrying out slag skimming treatment on the aluminum alloy, and in the slag skimming process, carefully skimming from one side to the other side through special equipment in a stable environment, preventing slag from being involved into the aluminum alloy and preventing aluminum alloy mixing;
(S5) refining: after the molten material in the step (S4) is cooled, and the molten material is moved to a standing furnace for refining after the temperature is appropriate, the molten material is refined to obtain pure molten material;
(S6) discharging and cleaning: the smelting pot after the melt is taken out needs to be cleaned, and in the process of cleaning the smelting pot, the inner wall and the bottom of the smelting pot body can be cleaned through the stirring device, so that the melt residue in the smelting pot body is prevented.
2. The aluminum casting machining process according to claim 1, characterized in that: the aluminum content of the aluminum alloy is 99% or more, and the content of other impurity elements is 1% or less.
3. The aluminum casting machining process according to claim 1, characterized in that: in the process of fixing the heat preservation mechanism in the melting process (S2), the method specifically comprises the following steps:
(1) firstly, fixing the heat-preservation inner shell by a fastening device, wherein the fastening device can be a high-temperature-resistant bolt, a screw rod and the like, and the heat-preservation inner shell is made of a high-temperature-resistant material;
(2) then winding the heat-insulating layer on the outer side of the heat-insulating inner shell, wherein the thickness of the heat-insulating layer is 3-5 cm;
(3) and finally, winding the heat-insulating outer shell on the outer side of the heat-insulating layer through a fastening device, fixing the heat-insulating outer shell through the fastening device, wherein the fastening device can be a high-temperature-resistant bolt, a screw rod and the like, and the heat-insulating inner shell is made of a high-temperature-resistant material, and the fastening device of the heat-insulating inner shell and the fastening device of the heat-insulating outer shell are not on the same horizontal plane.
4. The aluminum casting machining process according to claim 1, characterized in that: the temperature of refining in the step (S5) is between 800 and 850 ℃.
5. The aluminum casting machining process according to claim 1, characterized in that: the refining time in the step (S5) is 20-30 min.
6. The aluminum casting machining process according to claim 1, characterized in that: in the slag removing process in the step (S4), the slag is removed completely by spirally removing the slag from one side of the top to the other side of the top through special equipment.
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| CN113088726A (en) * | 2021-03-02 | 2021-07-09 | 安徽绿能技术研究院有限公司 | Preparation process of aluminum alloy material on engine piston |
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