CN114192744A - Solution method for undercasting, loosening and cracking of swirler precision casting - Google Patents
Solution method for undercasting, loosening and cracking of swirler precision casting Download PDFInfo
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- CN114192744A CN114192744A CN202111535214.5A CN202111535214A CN114192744A CN 114192744 A CN114192744 A CN 114192744A CN 202111535214 A CN202111535214 A CN 202111535214A CN 114192744 A CN114192744 A CN 114192744A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
- B22C7/02—Lost patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/12—Treating moulds or cores, e.g. drying, hardening
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/005—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like with heating or cooling means
- B22D41/01—Heating means
- B22D41/015—Heating means with external heating, i.e. the heat source not being a part of the ladle
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Abstract
The invention provides a solution for undercasting, loosening and cracking of a precision casting of a swirler, which comprises the following steps: step 1, carrying out heat preservation treatment on an axial flow swirler shell at 1200-1250 ℃ under a vacuum condition; melting the high-temperature alloy at 1530-1550 ℃ to obtain a molten liquid high-temperature alloy; and 2, pouring the melted liquid high-temperature alloy into the heat-insulated axial flow swirler shell, and then air-cooling the obtained axial flow swirler shell at room temperature to obtain an axial flow swirler precision casting. The invention solves the problems of insufficient casting, looseness and cracks caused by insufficient feeding due to too fast metal cooling in the casting channel and the blade, greatly improves the qualified rate and the production efficiency of the casting, reduces the production cost, and has important reference significance for precision castings of vortex devices with other similar structures.
Description
Technical Field
The invention relates to the technical field of investment precision casting production, in particular to a solution for undercasting, loosening and cracking of a precision casting of a swirler.
Background
Engineering practice shows that: the double-stage axial-flow swirler in the combustion chamber of the aero-engine relates to reliable ignition and stable combustion of the combustion chamber, and directly influences performance indexes such as combustion efficiency, outlet temperature distribution and flameout boundary of the combustion chamber. The double-stage axial flow swirler is mainly designed to adapt to a high-temperature-rise and high-heat-load combustion chamber. The double-stage axial-flow swirler can ensure the proper air flow rate of the head of the flame tube and has good pneumatic atomization performance. The double-stage axial-flow swirler generally comprises an inner layer of special-shaped annular wall, a middle layer of special-shaped annular wall and an outer layer of special-shaped annular wall, and blades are uniformly distributed between every two layers of annular walls along the circumferential direction.
The double-stage axial flow swirler has small size and complex structure, blades uniformly distributed along the circumferential direction between the ring walls are smaller and thinner, the rotating directions of the blades of the inner ring and the outer ring are opposite, metal flow is not smooth, and the double-stage axial flow swirler is influenced by the structural characteristics of the double-stage axial flow swirler, namely the double-stage axial flow swirler is manufactured and formed in a wax mold and is influenced in the aspect of metal liquid filling.
At present, the shell is made by adopting ethyl silicate hydrolysate and the vacuum three-chamber furnace is adopted to cast the two-stage axial flow swirler, and the casting method has two defects: firstly, the shell is made by adopting ethyl silicate hydrolysate, and in order to ensure that the shell has certain strength, the number of layers of the shell made by the coating is generally more than 7, and the shell is thick and has poor heat dissipation; secondly, because the casting structure is more complicated, the molten metal pouring time is longer, the flow time in the shell is longer, the part that the molten metal flowed to at last, because the molten metal temperature drops, mobility reduces, leads to the foundry goods can not effectively be filled, produces easily to lack to cast and loose defect, because the shell temperature drops very fast moreover, the difference in temperature between pouring temperature and the shell temperature is great, produces crack defect easily in stress concentration area for this type of foundry goods qualification rate is lower, causes great economic loss.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for solving the problems of under-casting, loosening and cracking of a precision casting of a swirler, solves the problems of under-casting, loosening and cracking of the precision casting of the swirler and improves the qualification rate of the precision casting.
The invention is realized by the following technical scheme:
a solution method for undercasting, loosening and cracking of a precision casting of a swirler comprises the following steps:
melting the high-temperature alloy at 1530-1550 ℃ to obtain a molten liquid high-temperature alloy;
and 2, pouring the melted liquid high-temperature alloy into the heat-insulated axial flow swirler shell, and then air-cooling the obtained axial flow swirler shell at room temperature to obtain an axial flow swirler precision casting.
Preferably, the heat preservation of the axial flow swirler type shell and the melting of the high-temperature alloy in the step 1 are synchronously carried out in a three-chamber vacuum furnace.
Further, the axial flow swirler shell is kept at the temperature for 30-60 min.
And further, step 1, placing a shell heat insulation cover on a chassis of the three-chamber vacuum furnace, fixing the axial-flow swirler shell on the shell heat insulation cover, and lifting the chassis of the three-chamber vacuum furnace to the double drive of the three-chamber vacuum furnace when the axial-flow swirler shell is subjected to heat preservation.
Further, in the step 2, after the melted liquid high-temperature alloy is poured into the heat-insulated axial-flow swirler shell, the chassis of the three-chamber vacuum furnace is firstly pulled to the bottom of the three-chamber vacuum furnace within 3-5min, and then the obtained axial-flow swirler shell is air-cooled.
Preferably, step 1 melts the superalloy with a power of 10-20 kW.
Preferably, the vacuum degree of the vacuum in the step 1 is less than or equal to 1.33 Pa.
Preferably, the axial flow swirler shell in the step 1 is obtained by the following process:
firstly, installing a wax mould of a precision casting of the axial flow swirler on a wax mould tree, then adopting full silica sol to manufacture a shell, dewaxing to obtain a mould shell of the axial flow swirler, and then pre-roasting and cleaning the mould shell of the axial flow swirler to obtain the mould shell of the axial flow swirler.
Furthermore, the axial flow swirler module type shell is pre-baked for 1-1.5h at 735-765 ℃.
Preferably, step 2 is to pour the molten liquid high-temperature alloy into the insulated axial flow swirler shell within 3 s.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention relates to a method for solving the defects of undercasting, loosening and cracking of a precision casting of a vortex device, which increases the fluidity of an alloy liquid by reducing the temperature difference between the shell temperature of an axial-flow vortex device and the melting temperature of a high-temperature alloy, can achieve the aim of quick mold filling, and can effectively reduce the defects of undercasting, loosening and cracking of the precision casting of a double-layer vortex device and improve the qualification rate of the casting by cooling at room temperature after pouring. The invention obviously improves the mold filling capacity of the alloy melt, solves the problems of under-casting, loosening and cracking caused by insufficient feeding due to over-fast metal cooling in the casting channel and the blade, greatly improves the qualification rate and the production efficiency of the casting, reduces the production cost, and has important reference significance for precision castings of vortex devices with other similar structures.
Furthermore, a three-chamber vacuum melting furnace is adopted for pouring, so that the temperature of the axial flow swirler shell reaches a temperature higher than that in the prior art, the temperature of the axial flow swirler shell can be kept in a stable temperature range, the constant high temperature required by the axial flow swirler shell is ensured, the fluidity of alloy liquid is increased, the mold filling capacity of alloy is improved, the defects of casting under-casting and loosening are well overcome, and the temperature difference between the temperature of the axial flow swirler shell and the melting temperature of high-temperature alloy is reduced, so that the temperature drop of the axial flow swirler shell before pouring is small, the problem of cracks in a stress concentration area of the casting is well solved, the qualified rate of the casting is greatly improved, and the defects in the prior art are avoided, namely: limitations in axial flow swirler shell firing temperatures and rapid temperature drop caused by axial flow swirler shells being removed from the firing furnace and transferred to the vacuum furnace casting chamber.
Drawings
FIG. 1 is a front view of a tree of axial flow swirler wax pattern modules in step 2) of the method of the present invention.
FIG. 2 is a top view of the wax pattern module of the axial flow swirler in step 2) of the method of the present invention.
FIG. 3 is a schematic view of the axial flow swirler module type shell in step 6) of the method of the present invention.
In the figure: 1 is a wax mould of a precision casting of an axial-flow swirler; 2 is a horizontal pouring channel; 3 is a straight pouring channel; 4 is a first inner gate; 5 is a second inner gate; 6 is a pouring cup; and 7, a shell heat insulation cover.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
The invention relates to a solution for undercasting, loosening and cracking of a precision casting of an axial flow swirler, which is suitable for a two-stage axial flow swirler and a single-stage axial flow swirler, and specifically comprises the following steps:
1) adopting a wax pressing machine to press a wax mould of the precision casting of the axial flow swirler according to the shape of the precision casting of the axial flow swirler;
2) assembling a wax mold 1 of a precision casting of an axial-flow swirler with a cross runner 2, a sprue 3 and a sprue cup 6 to form a wax mold assembly tree; as shown in fig. 1 and 2, the wax pattern module is divided into an upper layer and a lower layer, which are arranged at an angle of 45 degrees, a sprue 3 and a first ingate 4 are communicated and arranged at the outlet end of a pouring cup 6, fig. 2 only schematically shows an axial-flow swirler wax pattern 1 on a runner 2, wherein the first ingate 4 and a second ingate 5 are shown;
3) making a shell of the wax pattern module on the wax pattern module tree in the step 2), making the shell by adopting full silica sol, and then dewaxing to obtain a modular shell of the axial-flow swirler;
4) and putting the axial flow swirler module shell into a high-temperature box type furnace for pre-roasting at the pre-roasting temperature of 750 +/-15 ℃, and preserving heat for 1-1.5 hours to burn out residual wax materials in the two-stage axial flow swirler module shell to obtain the axial flow swirler shell.
5) Cleaning the shell of the axial flow turbine by using alcohol, checking whether leakage exists or not, repairing if leakage exists, and performing subsequent pouring process if leakage does not exist.
6) A three-chamber vacuum furnace is adopted for pouring, the pouring mode of the device is selected to mainly utilize the double-drive heating and heat preservation effect of the device to ensure the high temperature required by the shell of the axial-flow swirler and the constancy of the high temperature, a flat shell heat insulation cover 7 is arranged on a chassis of the three-chamber vacuum furnace, the height of the shell heat insulation cover 7 is 6-9mm as shown in figure 3, and the undercasting caused by local chilling is prevented.
Specifically, the shell of the axial-flow swirler is placed on a shell heat insulation cover 7 and clamped firmly, the pouring cup 6 is required to be upward when the shell of the axial-flow swirler, the shell heat insulation cover 7 and a chassis form an integrated structure, then the integrated structure is lifted to a double drive of a three-chamber vacuum furnace, the vacuum degree is not more than 1.33Pa, the shell is heated to 1200-1250 ℃, and the temperature is kept for 30-60 minutes, so that the temperature of the shell of the axial-flow swirler is homogenized.
7) And (3) synchronously melting high-temperature alloy such as K536 alloy in a melting chamber of the three-chamber vacuum furnace in the step 6), adopting low-power melting material with 10-20KW power to avoid splashing of the K536 alloy, melting the K536 alloy to 1540 +/-10 ℃ after the axial flow swirler module shell is heated to 1200-1250 ℃ and is kept warm for 30-60min, and then rapidly pouring (within 3S) the molten shell into the axial flow swirler shell.
8) And rapidly drawing the integrated structure to the bottom of the three-chamber vacuum furnace to ensure that the process is finished within 3-5 minutes.
9) Breaking the vacuum of the three-chamber vacuum furnace, taking out the cast axial flow swirler shell, namely the axial flow swirler casting mold, from the integrated structure, and placing the cast axial flow swirler shell in an atmospheric room temperature environment for air cooling to ensure a higher cooling rate, thereby obtaining the axial flow swirler precision casting.
10) And (4) carrying out the procedures of shelling, cutting, polishing and sand blowing on the precision casting of the axial-flow swirler subsequently, and carrying out appearance detection, fluorescence detection and ray detection to detect the quality of the casting.
Example 1:
the maximum outer diameter of the blade wall of the double-stage axial-flow swirler of a certain machine is phi 48.1mm, the height of the double-stage axial-flow swirler is 34mm, 12 small blades are uniformly distributed between every two layers of ring walls along the circumferential direction, and the thicknesses of the blades and the ring walls are only 1.2 mm.
The casting method comprises the following steps:
1) adopting a wax pressing machine to press a wax mould of the precision casting of the two-stage axial flow swirler according to the shape of the precision casting of the two-stage axial flow swirler;
2) assembling a wax mould of a precision casting of the two-stage axial flow swirler with a cross gate 2, a sprue 3 and a sprue cup 6 to form a wax mould assembly tree;
3) making a shell of the wax pattern combination on the wax pattern module tree in the step 2), making the shell by adopting full silica sol, and then dewaxing to obtain a double-stage axial flow swirler module shell;
4) and (3) placing the two-stage axial flow swirler module shell into a high-temperature box type furnace for pre-roasting, wherein the pre-roasting temperature is 750 ℃, preserving heat for 1 hour, and burning out residual wax materials in the two-stage axial flow swirler module shell to obtain the two-stage axial flow swirler shell.
5) Cleaning the shell of the two-stage axial flow swirler by using alcohol, checking whether leakage exists or not, repairing if leakage exists, and performing a subsequent pouring process if leakage does not exist.
6) And (3) pouring by adopting a three-chamber vacuum furnace, and placing a flat shell heat-insulating cover 7 on a chassis of the three-chamber vacuum furnace, wherein the thickness of the shell heat-insulating cover 7 is 6 mm.
Specifically, a shell of the two-stage axial flow swirler is placed on a shell heat insulation cover 7 and clamped firmly, a pouring cup 6 needs to be arranged upwards during placement, the shell of the two-stage axial flow swirler, the shell heat insulation cover 7 and a chassis form an integrated structure, then the integrated structure is lifted to a double-drive of a three-chamber vacuum furnace for heating, the vacuum degree is 1.33Pa, the temperature is heated to 1250 ℃, and the temperature is kept for 30 minutes, so that the temperature of the shell of the two-stage axial flow swirler is homogenized.
7) And (3) synchronously with the step 6), melting the K536 alloy in a melting chamber of the three-chamber vacuum furnace, and melting the material by adopting 10KW power to avoid splashing of the K536 alloy. After the two-stage axial flow swirler shell is insulated at 1250 ℃ for 30min, melting the K536 alloy to 1530 ℃, and then quickly pouring the K536 alloy to the two-stage axial flow swirler shell in 3S.
8) And (3) rapidly drawing the cast integrated structure to the bottom of the three-chamber vacuum furnace, and ensuring the casting to be finished within 3 minutes.
9) Breaking the vacuum of the three-chamber vacuum furnace, taking out the cast two-stage axial flow swirler shell, namely the casting mold, from the integrated structure, and placing the cast two-stage axial flow swirler shell in an atmospheric room temperature environment for air cooling to ensure a higher cooling rate, thereby obtaining a two-stage axial flow swirler precision casting.
10) And (4) subsequently carrying out the procedures of shelling, cutting, polishing and sand blowing on the precision casting of the two-stage axial flow swirler, and carrying out appearance detection, fluorescence detection and ray detection to detect the quality of the casting.
Through the detection, the precision casting of the double-stage axial flow swirler has no undercasting and cracks, and the porosity meets the requirement of 1/8 '' bottom plate 4 in ASTM E192 standard.
Example 2:
the maximum outer diameter of the blade wall of the outer diameter of the double-stage axial-flow swirler of a certain machine is phi 47.3mm, the height of the double-stage axial-flow swirler is 31.5mm, 12 small blades are uniformly distributed between every two layers of ring walls along the circumferential direction, the thickness of the inner ring blade is 2.1mm, the thickness of the outer ring blade is 1.5mm, and the thickness of the ring walls is only 1.25 mm.
The casting method comprises the following steps:
1) adopting a wax pressing machine to press a wax mould of the precision casting of the two-stage axial flow swirler according to the shape of the precision casting of the two-stage axial flow swirler;
2) assembling a wax mould of a precision casting of the two-stage axial flow swirler with a cross gate 2, a sprue 3 and a sprue cup 6 to form a wax mould assembly tree;
3) making a shell of the wax pattern combination on the wax pattern module tree in the step 2), making the shell by adopting full silica sol, and then dewaxing to obtain a double-stage axial flow swirler module shell;
4) and (3) placing the double-stage axial flow swirler module shell into a high-temperature box type furnace for pre-roasting, wherein the pre-roasting temperature is 735 ℃, preserving the heat for 1.5 hours, and burning out residual wax materials in the double-stage axial flow swirler module shell to obtain the double-stage axial flow swirler shell.
5) Cleaning the shell of the two-stage axial flow swirler by using alcohol, checking whether leakage exists or not, repairing if leakage exists, and performing a subsequent pouring process if leakage does not exist.
6) And (3) pouring by adopting a three-chamber vacuum furnace, and placing a flat shell heat-insulating cover 7 on a chassis of the three-chamber vacuum furnace, wherein the thickness 7 of the shell heat-insulating cover is 7 mm.
Specifically, a shell of the two-stage axial flow swirler is placed on a shell heat insulation cover 7 and clamped firmly, a pouring cup 6 needs to be arranged upwards during placement, the shell of the two-stage axial flow swirler, the shell heat insulation cover 7 and a chassis form an integrated structure, then the integrated structure is lifted to a double drive of a three-chamber vacuum furnace for heating, the vacuum degree is 1.33Pa, the temperature is raised to 1240 ℃ and kept for 40 minutes, and the temperature of the shell of the two-stage axial flow swirler is homogenized.
7) And (3) synchronously with the step 6), melting the K536 alloy in a melting chamber of the three-chamber vacuum furnace, and melting by adopting 15KW power to avoid splashing of the K536 alloy. After the temperature of the two-stage axial flow swirler shell is kept at 1240 ℃ for 40min, melting the K536 alloy to 1550 ℃, and then quickly pouring the K536 alloy to the two-stage axial flow swirler shell in 3S.
8) And (3) rapidly drawing the cast integrated structure to the bottom of the three-chamber vacuum furnace, and ensuring the casting to be finished within 3 minutes.
9) Breaking the vacuum of the three-chamber vacuum furnace, taking out the cast two-stage axial flow swirler shell, namely the casting mold, from the integrated structure, and placing the cast two-stage axial flow swirler shell in an atmospheric room temperature environment for air cooling to ensure a higher cooling rate, thereby obtaining a two-stage axial flow swirler precision casting.
10) And (4) subsequently carrying out the procedures of shelling, cutting, polishing and sand blowing on the precision casting of the two-stage axial flow swirler, and carrying out appearance detection, fluorescence detection and ray detection to detect the quality of the casting.
Through the detection, the precision casting of the double-stage axial flow swirler has no undercasting and cracks, and the porosity meets the requirement of 1/8 '' bottom plate 4 in ASTM E192 standard.
Example 3:
the maximum outer diameter of the blade wall of the outer diameter of the double-stage axial-flow swirler of a certain machine is phi 50.3mm, the height of the double-stage axial-flow swirler is 35.5mm, 16 small blades are uniformly distributed between every two layers of ring walls along the circumferential direction, the thickness of the inner ring blade is 1.0mm, the thickness of the outer ring blade is 1.5mm, and the thickness of the ring wall is only 1.25 mm.
The casting method comprises the following steps:
1) adopting a wax pressing machine to press a wax mould of the precision casting of the two-stage axial flow swirler according to the shape of the precision casting of the two-stage axial flow swirler;
2) assembling a wax mould of a precision casting of the two-stage axial flow swirler with a cross gate 2, a sprue 3 and a sprue cup 6 to form a wax mould assembly tree;
3) making a shell of the wax pattern combination on the wax pattern module tree in the step 2), making the shell by adopting full silica sol, and then dewaxing to obtain a double-stage axial flow swirler module shell;
4) and (3) placing the double-stage axial flow swirler module shell into a high-temperature box type furnace for pre-roasting, wherein the pre-roasting temperature is 760 ℃, preserving heat for 1 hour, and burning out residual wax materials in the double-stage axial flow swirler module shell to obtain the double-stage axial flow swirler shell.
5) Cleaning the shell of the two-stage axial flow swirler by using alcohol, checking whether leakage exists or not, repairing if leakage exists, and performing a subsequent pouring process if leakage does not exist.
6) And (3) pouring by adopting a three-chamber vacuum furnace, and placing a flat shell heat-insulating cover 7 on a chassis of the three-chamber vacuum furnace, wherein the height of the shell heat-insulating cover 7 is 9 mm.
Specifically, a two-stage axial flow swirler shell is placed on a shell heat insulation cover 7 and clamped firmly, a pouring cup 6 needs to be arranged upwards during placement, the two-stage axial flow swirler shell, the shell heat insulation cover 7 and a chassis form an integrated structure, then the integrated structure is lifted to a double drive of a three-chamber vacuum furnace for heating, the vacuum degree is 1.33Pa, the temperature is heated to 1200 ℃, the temperature is kept for 60 minutes, and the temperature of the two-stage axial flow swirler shell is homogenized.
7) And (3) synchronously with the step 6), melting the K536 alloy in a melting chamber of the three-chamber vacuum furnace, and melting with 20KW power to avoid splashing of the K536 alloy. After the shell of the two-stage axial flow swirler is insulated for 60min at 1200 ℃, the K536 alloy is melted to 1530 ℃, and then the two-stage axial flow swirler is rapidly poured into the shell of the two-stage axial flow swirler within 3S.
8) And (3) rapidly drawing the cast integrated structure to the bottom of the three-chamber vacuum furnace, and ensuring the casting to be finished within 3 minutes.
9) Breaking the vacuum of the three-chamber vacuum furnace, taking out the cast two-stage axial flow swirler shell, namely the casting mold, from the integrated structure, and placing the cast two-stage axial flow swirler shell in an atmospheric room temperature environment for air cooling to ensure a higher cooling rate, thereby obtaining a two-stage axial flow swirler precision casting.
10) And then carrying out the procedures of shelling, cutting, polishing and sand blowing on the precision casting of the two-stage axial flow swirler, and carrying out appearance detection, fluorescence detection and ray detection to detect the quality of the casting.
Through the detection, the precision casting of the double-stage axial flow swirler has no undercasting and cracks, and the porosity meets the requirement of 1/8 '' bottom plate 4 in ASTM E192 standard.
Claims (10)
1. A method for solving the problems of undercasting, loosening and cracking of a precision casting of a swirler is characterized by comprising the following steps of:
step 1, carrying out heat preservation treatment on an axial flow swirler shell at 1200-1250 ℃ under a vacuum condition;
melting the high-temperature alloy at 1530-1550 ℃ to obtain a molten liquid high-temperature alloy;
and 2, pouring the melted liquid high-temperature alloy into the heat-insulated axial flow swirler shell, and then air-cooling the obtained axial flow swirler shell at room temperature to obtain an axial flow swirler precision casting.
2. The casting method for reducing undercasting, loosening and cracks of the precision casting of the swirler as claimed in claim 1, wherein the heat preservation of the axial flow swirler shell and the melting of the high-temperature alloy in the step 1 are synchronously carried out in a three-chamber vacuum furnace.
3. The casting method for reducing undercasting, porosity and cracks of the precision casting of the swirler as claimed in claim 2, characterized in that the axial-flow swirler shell is kept at the temperature for 30-60 min.
4. The casting method for reducing undercasting, loosening and cracks of the swirler precision casting according to claim 2, characterized in that the step 1 is that a shell heat insulation cover is placed on a chassis of the three-chamber vacuum furnace, then the axial-flow swirler shell is fixed on the shell heat insulation cover, and the chassis of the three-chamber vacuum furnace is lifted to the double drive of the three-chamber vacuum furnace when the axial-flow swirler shell is subjected to heat preservation.
5. The casting method for reducing undercasting, loosening and cracks of the swirler precision casting according to claim 4, characterized in that after the melted liquid high-temperature alloy is poured into the heat-insulated axial-flow swirler shell in the step 2, the chassis of the three-chamber vacuum furnace is firstly pulled to the bottom of the three-chamber vacuum furnace for 3-5min, and then the obtained axial-flow swirler shell is air-cooled.
6. The casting method for reducing undercasting, porosity and cracking of the precision casting of the swirler as recited in claim 1, wherein the step 1 is to melt the high-temperature alloy with 10-20kW of power.
7. The casting method for reducing undercasting, porosity and cracks of the precision casting of the swirler as recited in claim 1, wherein the vacuum degree of the vacuum in the step 1 is less than or equal to 1.33 Pa.
8. The casting method for reducing undercasting, loosening and cracking of the precision casting of the swirler as claimed in claim 1, wherein the axial flow swirler shell in the step 1 is obtained by the following processes:
firstly, installing a wax mould of a precision casting of the axial flow swirler on a wax mould tree, then adopting full silica sol to manufacture a shell, dewaxing to obtain a mould shell of the axial flow swirler, and then pre-roasting and cleaning the mould shell of the axial flow swirler to obtain the mould shell of the axial flow swirler.
9. The casting method for reducing undercasting, porosity and cracks of the swirler fine casting as claimed in claim 8, wherein the axial-flow swirler die-set shell is pre-baked at 735-765 ℃ for 1-1.5 h.
10. The casting method for reducing undercasting, loosening and cracks of the precision casting of the swirler as claimed in claim 1, wherein the step 2 is to pour the molten liquid high-temperature alloy into the heat-insulated shell of the axial-flow swirler within 3 s.
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2021
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