CN111187931B - Method for precisely controlling components of high-strength 2014 aluminum alloy cast ingot for civil aircraft landing gear hub - Google Patents
Method for precisely controlling components of high-strength 2014 aluminum alloy cast ingot for civil aircraft landing gear hub Download PDFInfo
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- C22C1/00—Making non-ferrous alloys
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- C22C21/16—Alloys based on aluminium with copper as the next major constituent with magnesium
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Abstract
The invention discloses a method for accurately controlling components of a high-strength 2014 aluminum alloy cast ingot for a civil aircraft landing gear hub, which adopts aluminum ingots with the precision of not less than 99.90 percent as furnace burden, and comprises the following steps of: firstly, when 25 to 40 percent of furnace burden is melted, electromagnetically stirring for 25 to 35 min; secondly, when the furnace burden is melted, stirring for 3-7min by a forklift, and then electromagnetically stirring for 25-35 min; thirdly, adding Mg ingots, stirring for 3-7min by a forklift when the Mg ingots are scalded, and then electromagnetically stirring for 25-35 min; fourthly, during material supplementing, stirring for 3-7min by a forklift, and then electromagnetically stirring for 12-18 min; when refining in the furnace, electromagnetically stirring for 35-45 min; simultaneously, removing hydrogen and slag from the aluminum liquid, pouring the aluminum liquid into a casting mold for casting, wherein the casting temperature is 725-3H is used as the reference value. The product quality can be improved.
Description
Technical Field
The invention relates to the technical field of manufacturing of aviation precision hub die forgings, in particular to a method for precisely controlling components of a high-strength 2014 aluminum alloy cast ingot for a civil aircraft landing gear hub.
Background
The large airplane is provided with a typical-specification forge piece which is the largest forge piece in the 2014-high aluminum alloy aviation precision hub die forge piece: and die forging of half wheel (inboard). The half-wheel (inboard) die forging is a precision die forging and is a disc die forging, the maximum outer hub size of a part is phi 593.3 multiplied by 309.1mm, and the maximum outer contour size of the die forging is phi 616.5 multiplied by 314.2 mm.
The parts inside the half wheel cabin are shown in fig. 1 and fig. 2, and fig. 1 is a first side view structure schematic diagram of the 2014 aluminum alloy aviation precision hub die forging provided by the embodiment of the invention; fig. 2 is a schematic side view of a 2014 aluminum alloy aviation precision hub die forging, which is a relatively complex large aluminum alloy forging, the maximum external dimension of the forging is phi 600mm × 310mm, the maximum depth of the cylinder is 240mm, the minimum position of the cylinder wall is only 7.6mm, and the maximum position of the cylinder wall is 16mm, and the forging is a typical deep-cylinder thin-wall part, the basic body of which is a cylinder 12, the upper part of the cylinder 12 is provided with an annular outward extension part 11, an inner concave part is arranged above the outward extension part 11, 9 lugs 14 arranged in an annular manner are arranged at the junction of the inner concave part and the inner wall of the cylinder 12, and the bottom of the cylinder 12 is provided with 9 annular elliptical pits 13, specifically, the part is thin at the bottom of the cylinder, and has 9 uniformly distributed elliptical pits 13 at the same time, and the shape is complex; the upper side of the part is correspondingly provided with 9 lugs 14, and the lugs 14 are high in height, thin in wall thickness, small in inclination and small in vertical projection area, and belong to parts which are difficult to form and easy to have defects.
The half-wheel (inboard) die forging is a precision die forging, namely a disc die forging, and has the advantages of deep cavity, thin wall, high rib, small fillet, more bosses at the inner cavity and the bottom and more complex cavity. The half-wheel (inboard) die forging has a large number of non-machined surfaces, small machining allowance, high surface quality requirement and extremely high dimensional precision requirement; the die forging has deep cavity, high and thin ribs and difficult precision die forging forming; the 2014 alloy is easy to generate coarse grains, and the uniformity of the structure performance is difficult to control; the safety performance requirement of the wheel hub is high, and the comprehensive performance requirement is extremely high. Therefore, the biggest difficulties of the hub die forging are large difficulty in controlling the size and the uniformity of the structure performance.
Therefore, how to provide a method for precisely controlling components of a high-strength 2014 aluminum alloy cast ingot for a civil aircraft landing gear hub to improve the product quality is a technical problem to be solved urgently by technical personnel in the field.
Disclosure of Invention
In view of the above, the invention aims to provide a method for precisely controlling components of a high-strength 2014 aluminum alloy cast ingot for a civil aircraft landing gear hub so as to improve the product quality.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for precisely controlling components of a high-strength 2014 aluminum alloy cast ingot for a civil aircraft landing gear hub adopts aluminum ingots with the precision of not less than 99.90 percent as furnace burden,
the stirring sequence is as follows:
firstly, when 25 to 40 percent of furnace burden is melted, electromagnetically stirring for 25 to 35 min;
secondly, when the furnace burden is melted, stirring for 3-7min by a forklift, and then electromagnetically stirring for 25-35 min;
thirdly, adding Mg ingots, stirring for 3-7min by a forklift when the Mg ingots are scalded, and then electromagnetically stirring for 25-35 min;
fourthly, during material supplementing, stirring for 3-7min by a forklift, and then electromagnetically stirring for 12-18 min;
when refining in the furnace, electromagnetically stirring for 35-45 min;
simultaneously, the hydrogen and the slag of the aluminum liquid are removed,
pouring the aluminum liquid into a casting mold for casting, wherein the casting temperature is 725-745 ℃, the casting speed is 55-65mm/min, and the water flow is 80-90m during casting3/h。
Preferably, the stirring sequence is:
firstly, when the furnace burden is melted 1/3, electromagnetically stirring for 30 min;
secondly, stirring for 5min by a forklift when furnace burden is melted, and then electromagnetically stirring for 30 min;
adding Mg ingots, stirring for 5min by a forklift when the Mg ingots are scalded, and then performing electromagnetic stirring for 30 min;
fourthly, stirring for 5min by a forklift during material supplementing, and then electromagnetically stirring for 15 min;
and fifthly, when refining in the furnace, electromagnetically stirring for 40 min.
Preferably, the casting temperature is 730-.
Preferably, the casting temperature is 737 ℃.
Preferably, the casting temperature is 745 ℃.
Preferably, the casting speed is 58 mm/min.
Preferably, the water flow rate during casting is 84m3/h。
Preferably, the water flow rate during casting is 86m3/h。
The invention provides a method for precisely controlling components of a high-strength 2014 aluminum alloy cast ingot for a civil aircraft landing gear hub, which adopts aluminum ingots with the precision of not less than 99.90 percent as furnace burden,
the stirring sequence is as follows:
firstly, when 25 to 40 percent of furnace burden is melted, electromagnetically stirring for 25 to 35 min;
secondly, when the furnace burden is melted, stirring for 3-7min by a forklift, and then electromagnetically stirring for 25-35 min;
thirdly, adding Mg ingots, stirring for 3-7min by a forklift when the Mg ingots are scalded, and then electromagnetically stirring for 25-35 min;
fourthly, during material supplementing, stirring for 3-7min by a forklift, and then electromagnetically stirring for 12-18 min;
when refining in the furnace, electromagnetically stirring for 35-45 min;
simultaneously, the hydrogen and the slag of the aluminum liquid are removed,
pouring the aluminum liquid into a casting mold for casting, wherein the casting temperature is 725-745 ℃, the casting speed is 55-65mm/min, and the water flow is 80-90m during casting3/h。
According to the method for accurately controlling the components of the high-strength 2014 aluminum alloy cast ingot for the civil aircraft landing gear hub, the stirring process is optimized through the smelting and standing double-electromagnetic stirring system and the forklift auxiliary stirring, the component uniformity is improved, and the melting progress is accelerated. In order to control the Fe content, on one hand, before the alloy is produced, a smelting furnace, a holding furnace, a degassing chamber and a filtering basin are thoroughly drained and a furnace is greatly cleaned. On the other hand, 99.90% of high-precision aluminum ingots are selected as the furnace burden. Wherein, Cu element is easy to sink due to large specific gravity, Mg is small specific gravity and easy to burn, so the two metals are melted by adopting a scalding mode.
Meanwhile, the molten aluminum is subjected to dehydrogenation and deslagging, so that the final hydrogen content in the melt is reduced to the minimum level, preparation is made for obtaining a compact ingot casting structure, the molten aluminum is separated from oxidation slag in the degassing treatment process, and the original slag content in the melt is reduced to a great extent through multi-stage pretreatment.
The casting main parameters including casting temperature, casting speed, cooling water flow, cooling water temperature and the like are key parameters for ingot forming and ingot internal quality control, and play a decisive role in ingot organization structure, mechanical property and surface quality. According to the method for accurately controlling the components of the high-strength 2014 aluminum alloy ingot for the civil aircraft landing gear hub, the shape and the depth of a casting liquid cavity are controlled by controlling the relation among the casting temperature, the casting speed and the cooling water flow on the basis of the change of the water temperature of cooling water, the loosening defect caused by solidification feeding due to the obstruction of a dendritic network is reduced, and the compactness and the uniformity of the internal structure of the ingot are improved. Thereby improving the product quality.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic side view structure diagram of a 2014 aluminum alloy aviation precision hub die forging provided in an embodiment of the present invention;
FIG. 2 is a second side view structural schematic diagram of the 2014 aluminum alloy aviation precision hub die forging provided in the embodiment of the invention;
FIG. 3 is a statistical chart of sampling components in the radial direction of an ingot;
FIG. 4 is a photograph of the structure of a first specimen 100X of a first sample before soaking;
FIG. 5 is a photograph of the second coupon 100X of the first sample before soaking;
FIG. 6 is a picture of the core structure of the first specimen of the second sample after soaking;
FIG. 7 is a photograph of the surface texture of the first coupon of the second sample after soaking;
FIG. 8 is a photograph showing the core structure of the first specimen of the third sample after soaking;
FIG. 9 is a photograph of the surface texture of the first coupon of the third sample after soaking.
In the above FIGS. 1-9:
the outer extension part 11, the cylinder 12, the oval pit 13 and the lug 14.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 3 to 9, fig. 3 is a statistical chart of sampling components in the radial direction of the ingot; FIG. 4 is a photograph of the structure of a first specimen 100X of a first sample before soaking; FIG. 5 is a photograph of the second coupon 100X of the first sample before soaking; FIG. 6 is a picture of the core structure of the first specimen of the second sample after soaking; FIG. 7 is a photograph of the surface texture of the first coupon of the second sample after soaking; FIG. 8 is a photograph showing the core structure of the first specimen of the third sample after soaking; FIG. 9 is a photograph of the surface texture of the first coupon of the third sample after soaking.
The embodiment of the invention provides a method for accurately controlling components of a high-strength 2014 aluminum alloy cast ingot for a civil aircraft landing gear hub, which adopts the aluminum ingot with the precision of not less than 99.90 percent as a furnace burden,
the stirring sequence is as follows:
firstly, when 25 to 40 percent of furnace burden is melted, electromagnetically stirring for 25 to 35 min;
secondly, when the furnace burden is melted, stirring for 3-7min by a forklift, and then electromagnetically stirring for 25-35 min;
thirdly, adding Mg ingots, stirring for 3-7min by a forklift when the Mg ingots are scalded, and then electromagnetically stirring for 25-35 min;
fourthly, during material supplementing, stirring for 3-7min by a forklift, and then electromagnetically stirring for 12-18 min;
when refining in the furnace, electromagnetically stirring for 35-45 min;
simultaneously, the hydrogen and the slag of the aluminum liquid are removed,
pouring the aluminum liquid into a casting mold for casting, wherein the casting temperature is 725-745 ℃, the casting speed is 55-65mm/min, and the water flow is 80-90m during casting3/h。
According to the method for accurately controlling the components of the high-strength 2014 aluminum alloy cast ingot for the civil aircraft landing gear hub, the stirring process is optimized through the smelting and standing double-electromagnetic stirring system and the forklift auxiliary stirring, the component uniformity is improved, and the melting progress is accelerated. In order to control the Fe content, on one hand, before the alloy is produced, a smelting furnace, a holding furnace, a degassing chamber and a filtering basin are thoroughly drained and a furnace is greatly cleaned. On the other hand, 99.90% of high-precision aluminum ingots are selected as the furnace burden. Wherein, Cu element is easy to sink due to large specific gravity, Mg is small specific gravity and easy to burn, so the two metals are melted by adopting a scalding mode.
Meanwhile, the molten aluminum is subjected to dehydrogenation and deslagging, so that the final hydrogen content in the melt is reduced to the minimum level, preparation is made for obtaining a compact ingot casting structure, the molten aluminum is separated from oxidation slag in the degassing treatment process, and the original slag content in the melt is reduced to a great extent through multi-stage pretreatment.
The casting main parameters including casting temperature, casting speed, cooling water flow, cooling water temperature and the like are key parameters for ingot forming and ingot internal quality control, and play a decisive role in ingot organization structure, mechanical property and surface quality. According to the method for accurately controlling the components of the high-strength 2014 aluminum alloy ingot for the civil aircraft landing gear hub, the shape and the depth of a casting liquid cavity are controlled by controlling the relation among the casting temperature, the casting speed and the cooling water flow on the basis of the change of the water temperature of cooling water, the loosening defect caused by solidification feeding due to the obstruction of a dendritic network is reduced, and the compactness and the uniformity of the internal structure of the ingot are improved. Thereby improving the product quality.
Specifically, the stirring sequence is as follows:
firstly, when the furnace burden is melted 1/3, electromagnetically stirring for 30 min;
secondly, stirring for 5min by a forklift when furnace burden is melted, and then electromagnetically stirring for 30 min;
adding Mg ingots, stirring for 5min by a forklift when the Mg ingots are scalded, and then performing electromagnetic stirring for 30 min;
fourthly, stirring for 5min by a forklift during material supplementing, and then electromagnetically stirring for 15 min;
and fifthly, when refining in the furnace, electromagnetically stirring for 40 min.
Specifically, the casting temperature is 730-. For example, the casting temperature is 737 ℃. Or the casting temperature is 745 ℃.
Specifically, the casting speed was 58 mm/min.
Specifically, the water flow during casting is 84m3H is used as the reference value. Or the water flow during casting is 86m3/h。
The invention provides a method for accurately controlling components of a high-strength 2014 aluminum alloy cast ingot for a civil aircraft landing gear hub, which comprises the following preliminary scheme of component optimization of the cast ingot:
(1) a Zr-free alloy: 4.1% Cu, 0.4% Mg, 0.1% Fe, 0.7% Si, 0.8% Mn. When the controllable deviation of the furnace temperature is +/-5 ℃, the homogenization process adopts: 450 ℃ X5 h +505 ℃ X30 h.
(2) Adding Zr alloy: 4.1% Cu, 0.4% Mg, 0.1% Fe, 0.7% Si, 0.6% Mn, 0.1% Zr. When the controllable deviation of the furnace temperature is +/-5 ℃, the homogenization process adopts: 400 ℃ X10 h +450 ℃ X5 h +505 ℃ X30 h.
From the determined target value of the optimized 2014 alloy component control, the component control range is further narrowed, the component control accuracy is improved, and the optimal component control range and the target value are determined as shown in table 1. Table 1 shows 2014 hub chemical composition.
Watch 12014 hub chemistry
Through smelting, the double electromagnetic stirring system that stews and fork truck auxiliary stirring, optimize the stirring technology, improve the composition homogeneity.
Optimizing and verifying the production process according to the determined chemical component control range:
(1) in order to control the Fe content, on one hand, before the alloy is produced, a smelting furnace, a holding furnace, a degassing chamber and a filtering basin are thoroughly drained and a furnace is greatly cleaned. On the other hand, 99.90% of high-precision aluminum ingots are selected as the furnace burden.
(2) The Cu element is easy to sink due to high specific gravity, and the Mg element is small in specific gravity and easy to burn, so that the two metals are melted in a scalding mode.
(3) In order to accelerate the melting progress and the component uniformity, the melt stirring is optimized. As shown in detail in fig. 2. Table 2 shows the stirring process.
TABLE 2 stirring Process
| Sequence of agitation | Stirring mode | Timing of stirring | Stirring time/ |
| 1 | Electromagnetic stirring | Melting of |
30 |
| 2 | Forklift stirring | Melting and leveling of furnace burden | 5 |
| 3 | Electromagnetic stirring | Melting and leveling of furnace burden | 30 |
| 4 | Forklift stirring | Ironing Mg ingot | 5 |
| 5 | Electromagnetic stirring | Ironing Mg ingot | 30 |
| 6 | Forklift stirring | Feed supplement | 5 |
| 7 | Electromagnetic stirring | |
15 |
| 8 | Electromagnetic stirring | In-furnace refining | 40 |
After the melting and stirring processes, the ingredients of the ingot casting finished product are shown in table 3, and table 3 shows the ingredients of the 2014 ingot casting finished product. It is seen from Table 3 that they are all within the composition control range.
Table 32014 ingot final product composition
The composition was sampled in the radial direction of the ingot and the result is shown in FIG. 3. FIG. 3 is a statistical chart of the components sampled in the radial direction of the ingot.
Specifically, the metallurgical quality control of the cast ingot comprises the following steps:
according to the requirement of the high-strength 2014 aluminum alloy hub on the size of the cast ingot, a set of same-level hot-top crystallizer with the phi 282mm specification is designed and manufactured. Compared with a single aluminum crystallizer, the crystallizer has the advantages of the same horizontal flow supply casting, hot top casting, close-packed casting, graphite ring crystallization, automatic lubrication technology and the like. Metallurgical defects such as optical crystal, slag inclusion, oxide film and the like are avoided, and cast ingot pulling crack waste products are reduced. The aluminum liquid is crystallized through the graphite ring, the surface defect depth is reduced, and high-quality cast ingots with shallow coarse crystal layers are obtained.
Casting process parameters are the most critical parameters of casting, the first is to solve ingot forming, and the second is to solve the surface quality of the ingot, and the most important is to solve the internal quality of the ingot. The ingot casting performance is improved by determining the quality of the melt, the refining process and the main casting parameters (cooling water flow, casting speed and casting temperature).
(1) Melt quality control
The quality of the melt mainly refers to the purity of the melt, and the enhancement of the melt treatment mainly reduces the slag content and the gas content in the melt.
Firstly, controlling the hydrogen content of the melt
The fusion casting machine set for producing the alloy is provided with an HD-2000 rotary degassing system and an electromagnetic stirring system in a furnace, so that molten aluminum in the furnace can be fully contacted with a gas medium, and the hydrogen content in a melt is removed. The double-Alpur rotary degassing system is arranged on line, and degassing treatment is continuously carried out on the aluminum liquid in a series connection mode, and the specific process and the hydrogen content are as follows.
Through the pretreatment of the smelting furnace, most of slag on the surface layer of the melt is removed, and the suction carrier of the melt is reduced.
The in-furnace treatment process of the standing furnace is optimized, the holding furnace uses HD-2000 for refining, and the scheme 2 is selected for treatment (two times of refining, each time of refining for 20min), and the specific details are shown in Table 4. Table 4 shows the in-furnace treatment parameters.
TABLE 4 in-furnace treatment parameters
Optimizing an online degassing process, adding degassing devices, degassing the melt by adopting 2 degassing devices in a series connection mode, wherein the specific process range and the execution condition are shown in table 5, and the table 5 is online processing parameters, so that the final hydrogen content in the melt is reduced to the minimum level, and preparation is made for obtaining a compact ingot casting tissue.
Through optimization, ceramic filter plates with different filter precisions are used in a matching way, molten aluminum is filtered by multiple stages of high precisions to obtain molten aluminum with extremely high purity, and preparation is made for producing high-quality ingots.
TABLE 5 Online processing parameters
As can be seen from tables 4 and 5: the processes are all executed according to the process. The hydrogen content was measured at each point during the production process and is shown in table 6. Table 6 shows the hydrogen content.
TABLE 6 Hydrogen content
| Measuring position | Before degassing | Between the 1# and 2# degassing chambers | DegassingRear end | First stage degassing rate | Total degassing rate |
| Hydrogen content | 0.265 | 0.099 | 0.058 | 62.64％ | 78.11％ |
The hydrogen content of the melt is 0.058ml/100g.Al, and is less than 0.12ml/100g.Al, so that the requirement is met.
② controlling the content of the melt slag
The separation of the aluminum liquid and the oxidized slag is carried out during the degassing treatment, the original slag content in the melt is greatly reduced through multi-stage pretreatment, and the slag removal process of the melt is shown in the following table 7. Table 7 shows the deslagging procedure.
TABLE 7 deslagging Process
| Sequence of | Slag removal equipment | Opportunity for |
| 1 | Slag removing vehicle | Huaping |
| 2 | Slag removing vehicle | Before adding |
| 3 | Slag removing vehicle | Before sampling |
| 4 | Slag removing vehicle | Before discharge from furnace |
| 5 | Slag removing vehicle | Before refining |
| 6 | HD-2000 | Refining process |
| 7 | Slag removing vehicle | After the first refining |
| 8 | Alpur | Casting process |
| 9 | CFF filtration | Casting process |
(2) Grain refinement
In order to ensure that the strength of the product meets the requirements and the as-cast state crystal grains are as fine as possible, the process is optimized in front of the furnace, on the basis of complementing a certain Ti content in front of the furnace, the adding amount and the quality of an on-line refiner are optimized, the size of the cast ingot crystal grains is reduced, and the grain size of the cast ingot is reduced to obtain uniform and fine crystal grains, specifically as shown in Table 8, the process of the refiner is shown in Table 8. As can be seen from the table, the grain size of the cast structure of the ingot is reduced and the grains are finer after the optimization.
TABLE 8 refiner Process
(3) Casting process optimization
The main casting parameters (casting temperature, casting speed, cooling water flow and cooling water temperature) are key parameters for ingot forming and ingot internal quality control, and play a decisive role in ingot organization structure, mechanical property and surface quality. On the basis of the change of the temperature of the cooling water, the shape and the depth of a casting liquid cavity are controlled by researching the relation among the casting temperature, the casting speed and the flow of the cooling water, so that the loosening defect caused by solidification feeding obstructed by a dendritic crystal network is reduced, and the compactness and the uniformity of the internal structure of the cast ingot are improved.
By taking the production experience of casting the same type of alloy by hot-top tools with adjacent specifications as reference, a preliminary casting process is formulated as shown in table 9. Table 9 shows the preliminary casting process.
TABLE 9 preliminary casting Process
After the casting process is determined, production verification is carried out, and the results are as follows:
1) surface quality of the cast ingot: as can be seen from the on-site photos, the surface quality of the cast ingot in the casting process and after casting is finished, the surface of the cast ingot has the defects of fine cold shut, oil-pouring fine lines, no cracks, tensile cracks and the like, and the surface quality of the whole cast ingot is better.
2) And (3) detecting the height of the cast ingot: the grain size of the ingot before soaking of the 2014 alloy is 2.5-2 grades, and the coarse grain layer is 5-8 mm; after soaking, the grain size of the cast ingot is controlled to be 2 grade, and the coarse grain layer is controlled to be about 5 mm. As shown in tables 10 and 11, table 10 shows the results of the test material height times (not soaked), and table 11 shows the results of the test material height times (soaked).
TABLE 10 test material high and low times results (not soaking)
TABLE 11 test material high and low times result (soaking)
The size of the micro-porosity of the round is controlled to be about 50 mu m. The results of the photographic analysis of the tissue before and after soaking are shown in fig. 4-8, fig. 4 is a 100X tissue picture of the first sample specimen before soaking, fig. 5 is a 100X tissue picture of the first sample specimen before soaking, fig. 6 is a center tissue picture of the second sample specimen after soaking, fig. 7 is a surface tissue picture of the second sample specimen after soaking, fig. 8 is a center tissue picture of the third sample specimen after soaking, and fig. 9 is a surface tissue picture of the third sample specimen after soaking.
According to the above development results, the casting process parameters were optimized as shown in table 12. Table 12 shows the casting process parameters.
TABLE 12 casting Process parameters
| Casting process parameters | Casting temperature C | Casting speed mm/min | Water flow rate m3/h |
| Control range | 735±10 | 55-65 | 80-90 |
| Set value | 745 | 58 | 86 |
| Actual conditions | 730-745 | 58 | 86 |
(4) Results of research and development
The surface quality of the cast ingot is good, and the defects of tension cracking, cold shut and the like do not appear on the surface of the cast ingot. But because the water holes of the crystallizer are locally deformed, the cooling and the compensation are uniform, and the local surface of the cast ingot is white. Both the macroscopic and the oxide films meet the standard requirements, and the specific results are shown in Table 13. Table 13 shows the results of the macroscopic and oxidation film measurements.
TABLE 13 macroscopic and oxide film test results
Cutting a gate part and a bottom test piece of an ingot at a hot end to detect the microscopic porosity, the microstructure, the grain boundary structure precipitated phase and the average grain size in an as-cast state and a soaking and cooling state, and specifically as shown in table 14, the table 14 is the microscopic sparse size of the sample in each state.
TABLE 14 sample microscopic bulk size for each state
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A method for precisely controlling components of a high-strength 2014 aluminum alloy cast ingot for a civil aircraft landing gear hub is characterized in that the adopted furnace burden is an aluminum ingot with the precision of not less than 99.90 percent,
the stirring sequence is as follows:
firstly, when 25 to 40 percent of furnace burden is melted, electromagnetically stirring for 25 to 35 min;
secondly, when the furnace burden is melted, stirring for 3-7min by a forklift, and then electromagnetically stirring for 25-35 min;
thirdly, adding Mg ingots, stirring for 3-7min by a forklift when the Mg ingots are scalded, and then electromagnetically stirring for 25-35 min;
fourthly, during material supplementing, stirring for 3-7min by a forklift, and then electromagnetically stirring for 12-18 min;
when refining in the furnace, electromagnetically stirring for 35-45 min;
simultaneously, the hydrogen and the slag of the aluminum liquid are removed,
pouring the aluminum liquid into a casting mold for casting, wherein the casting temperature is 730-745 ℃, the casting speed is 55-65mm/min, and the water flow is 80-90m during casting3/h。
2. The method for precisely controlling the components of the high-strength 2014 aluminum alloy cast ingot for the civil aircraft landing gear hub according to claim 1, is characterized in that the stirring sequence is as follows:
firstly, when the furnace burden is melted 1/3, electromagnetically stirring for 30 min;
secondly, stirring for 5min by a forklift when furnace burden is melted, and then electromagnetically stirring for 30 min;
adding Mg ingots, stirring for 5min by a forklift when the Mg ingots are scalded, and then performing electromagnetic stirring for 30 min;
fourthly, stirring for 5min by a forklift during material supplementing, and then electromagnetically stirring for 15 min;
and fifthly, when refining in the furnace, electromagnetically stirring for 40 min.
3. The method for finely controlling the components of the high-strength 2014 aluminum alloy ingot for the civil aircraft landing gear hub according to claim 1, wherein the casting temperature is 737 ℃.
4. The method for finely controlling the components of the high-strength 2014 aluminum alloy ingot for the civil aircraft landing gear hub according to claim 1, wherein the casting temperature is 745 ℃.
5. The method for finely controlling the components of the high-strength 2014 aluminum alloy ingot for the civil aircraft landing gear hub according to claim 1, wherein the casting speed is 58 mm/min.
6. The method for precisely controlling components of the high-strength 2014 aluminum alloy ingot for the civil aircraft landing gear hub according to claim 1, wherein the water flow during casting is 84m3/h。
7. The method for precisely controlling components of the high-strength 2014 aluminum alloy ingot for the civil aircraft landing gear hub according to claim 1, wherein the water flow during casting is 86m3/h。
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