CN112091173B - Precision investment casting mold and casting method for spiral pump stator - Google Patents
Precision investment casting mold and casting method for spiral pump stator Download PDFInfo
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- CN112091173B CN112091173B CN202010745814.3A CN202010745814A CN112091173B CN 112091173 B CN112091173 B CN 112091173B CN 202010745814 A CN202010745814 A CN 202010745814A CN 112091173 B CN112091173 B CN 112091173B
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- 238000005495 investment casting Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000005266 casting Methods 0.000 title abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 239000010410 layer Substances 0.000 claims description 73
- 239000002002 slurry Substances 0.000 claims description 39
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 28
- 238000001035 drying Methods 0.000 claims description 23
- 239000004576 sand Substances 0.000 claims description 22
- 239000000843 powder Substances 0.000 claims description 19
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims description 18
- 229910052863 mullite Inorganic materials 0.000 claims description 18
- 229910052845 zircon Inorganic materials 0.000 claims description 14
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 claims description 14
- 239000002344 surface layer Substances 0.000 claims description 12
- 230000007704 transition Effects 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 10
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 10
- 238000004140 cleaning Methods 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 6
- 229910045601 alloy Inorganic materials 0.000 claims description 6
- 239000005350 fused silica glass Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- 239000008240 homogeneous mixture Substances 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 239000008259 solid foam Substances 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 abstract description 3
- 239000011257 shell material Substances 0.000 description 64
- 238000001816 cooling Methods 0.000 description 6
- 238000007711 solidification Methods 0.000 description 4
- 230000008023 solidification Effects 0.000 description 4
- 239000003129 oil well Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 235000004522 Pentaglottis sempervirens Nutrition 0.000 description 2
- 238000005422 blasting Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003110 molding sand Substances 0.000 description 2
- HBUBKKRHXORPQB-UHFFFAOYSA-N 2-(6-amino-2-fluoropurin-9-yl)-5-(hydroxymethyl)oxolane-3,4-diol Chemical compound C1=NC=2C(N)=NC(F)=NC=2N1C1OC(CO)C(O)C1O HBUBKKRHXORPQB-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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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
- B22C9/043—Removing the consumable pattern
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/082—Sprues, pouring cups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/088—Feeder heads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/20—Stack moulds, i.e. arrangement of multiple moulds or flasks
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention provides an investment precision casting mold and a casting method of a screw pump stator, wherein the investment precision casting mold adopts a vertical pouring gate, two sides of the vertical pouring gate are respectively provided with a stator mold, one side of the stator mold facing the vertical pouring gate is a near side, one side of the stator mold far away from the vertical pouring gate is a far side, the near side is provided with a plurality of feeding risers, the stator mold is connected to the vertical pouring gate through the feeding risers, and the wall thickness of the stator mold is uniformly thickened from the far side to the near side. The invention can improve the compactness of the internal structure of the stator, prolong the service life and the maintenance period of the stator and the screw pump and improve the production efficiency of the stator.
Description
Technical Field
The invention relates to a part casting process, in particular to an investment precision casting mold and a casting method of a screw pump stator.
Background
In the prior art, the traditional manufacturing process of the screw pump stator for the oil well causes the internal structure to be not compact. And because the operating environment is the abominable operating mode that has the silt, the oil well helical pump is with the life of stator very short to lead to the use of oil well helical pump and maintenance cost to improve greatly.
Disclosure of Invention
The invention aims to provide an investment precision casting mold and a casting method of a spiral pump stator, which can improve the compactness of the internal structure of the stator, prolong the service life and the maintenance period of the stator and the spiral pump and improve the production efficiency of the stator.
Particularly, the invention provides an investment precision casting mold of a screw pump stator, which adopts a vertical pouring channel, two sides of the vertical pouring channel are respectively provided with a stator mold, one side of the stator mold facing the vertical pouring channel is a near side, one side of the stator mold far away from the vertical pouring channel is a far side, the near side is provided with a plurality of feeding heads, the stator mold is connected to the vertical pouring channel through the feeding heads, and the wall thickness of the stator mold is uniformly thickened from the far side to the near side.
Preferably, the wall surface of the stator mold increases the wall thickness margin in an involute line from the far side to the near side.
Preferably, the shell of the stator mold has an inner wall surface with a thickness smaller than that of an outer wall surface thereof.
Preferably, the number of layers of the inner wall surface of the shell is less than that of the outer wall surface of the shell, the number of layers of the inner wall surface is four, and the number of layers of the outer wall surface is six.
According to another aspect of the invention, the invention also discloses an investment precision casting method of the spiral pump stator, which comprises the following steps:
s1: preparing slurry, wherein the surface layer slurry is a uniform mixture of zircon powder and quick-drying silica sol; the transition layer slurry is a uniform mixture of fused quartz powder and quick-drying silica sol; the back layer slurry is a homogeneous mixture of mullite powder and quick-drying silica sol;
s2: preparing a wax mould, and preparing the wax mould of the stator by using a wax pressing machine;
s3: manufacturing a primary shell, immersing the wax mould into the surface layer slurry for multiple times, uniformly scattering zircon sand on the surface taken out each time, and immersing again after taking out and drying each time; immersing the wax mould into the transition layer slurry for multiple times, uniformly scattering mullite sand on the surface after each taking out, and immersing again after each taking out and drying;
s4: blocking two ends of the inner hole of the primary shell after the step S3 by using a sealing piece;
s5: manufacturing a finished shell, namely immersing the wax mold obtained in the step S4 into the back layer slurry for multiple times, uniformly scattering mullite sand on the surface after each taking out, and immersing again after each taking out and drying; obtaining a shell wrapping the wax mould;
s6: dewaxing and cleaning, and removing wax materials in the shell;
s7: roasting, namely placing the shell of S6 into a roasting furnace for roasting;
s8: and (3) forming parts, namely pouring the alloy into the shell at a set temperature to obtain the stator parts.
Preferably, the inner hole of the primary shell is filled with solid foam, and the inlet and outlet of the inner hole are blocked at step S4.
Preferably, in step S3, the number of layers of the inner hole and the outer wall surface of the primary shell is at least four, the first layer is that the wax mold is immersed in the surface layer slurry, zircon sand is uniformly spread on the surface of the wax mold, and the wax mold is dried for 3-4 hours; the second layer is the same as the first layer; the third layer is that the wax mould is immersed into the slurry of the transition layer, the mullite sand is uniformly scattered on the surface of the wax mould, and the wax mould is dried for 3-4 hours; the fourth layer is the same as the third layer.
Preferably, in step S5, the number of the outer wall surface layers of the finished shell mold is at least a fifth layer and a sixth layer, the fifth layer is formed by immersing the wax mold into the back layer slurry, uniformly scattering mullite sand on the surface, and drying for 2-3 hours; the sixth layer is the same as the fifth layer.
Preferably, in step S7, the baking environment of the shell is: the temperature of the roasting furnace is 950-1000 ℃, and the roasting time is 120 min.
Preferably, in step S8, the set temperature is 1640 to 1650 ℃.
The investment precision casting mould and the casting method of the screw pump stator have at least the following advantages:
1. the stator die has uniform wall thickness. The stator increases the feeding allowance from the near side to the far side in an involute mode, the wall surface of the near side close to the pouring channel is thicker, the wall surface of the far side far away from the pouring channel is thinner, the uniform wall thickness is formed, sequential solidification is realized, and the feeding channel is smooth.
2. The two stator molds are symmetrically arranged at two sides of the vertical pouring channel. The pouring efficiency is greatly improved, and the feeding capacity of the runner is maximized. Furthermore, the stator die is provided with a plurality of feeding heads near the proximal side of the runner, which also maximizes the feeding capacity of the runner.
3. The wall surface layer number of the inner hole of the shell of the stator mold is smaller than that of the outer wall surface of the shell, the wall surface of the inner hole of the shell becomes thin, and the cooling speed in pouring is improved. Then matching with involute feeding allowance of stator wall thickness to make stator produce perfect sequential solidification, and cooling to obtain uniform compact structure.
4. The filter layer adopts fused silica powder as a slurry powder material, and when the casting alloy is cooled, different layers of the shell are different in material, and the shrinkage rates of the zircon powder, the fused silica powder and the mullite powder are different, so that micro cracks are generated, and the shell material on the surface of the stator part can be quickly removed during final cleaning. Cracks are generated in the cooling process, so that the molding sand at the inner hole spiral part can be very easily cleaned after the stator workpiece is cooled.
5. Adding quick-drying silica sol (NP powder) into the shell slurry to enable the shell to generate tiny holes after roasting, and increasing the air permeability of the shell.
6. The zircon powder and zircon sand adopted by the surface layer can ensure that a workpiece can obtain a smooth surface, so that the surface profile of the part can be well ensured.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily to scale. In the drawings:
FIG. 1 is a schematic elevation view of an investment casting mold for a screw pump stator of the present invention;
FIG. 2 is a schematic view of an investment casting mold for a screw pump stator according to the present invention at a bird's eye view angle;
FIG. 3 is a schematic view of an investment casting mold for a screw pump stator of the present invention, the stator mold being shown;
FIG. 4 is a schematic view of the stator mold shown in FIG. 3 at a bird's eye view angle;
FIG. 5 is a simplified flow diagram of the present invention method for investment casting a screw pump stator.
The symbols in the drawings have the following meanings:
1-near side, 2-far side, 3-feeding head, 4-involute profile, 5-vertical runner, 6-pouring cup
Detailed Description
As shown in figures 1 and 2, the investment precision casting mould of the spiral pump stator adopts a vertical pouring channel 5. The vertical pouring channel 5 comprises a pouring channel and a pouring cup 6. Two sides of the vertical pouring gate 5 are respectively provided with a stator die. The two stator molds are symmetrical. Wherein, the side of the stator mould facing the vertical pouring channel 5 is set as a near side 1, and the side of the stator mould far away from the vertical pouring channel 5 is set as a far side 2. The proximal side 1 of the stator runner is provided with a plurality of feeding heads 3, in this embodiment two feeding heads 3 are present and evenly distributed along the axial direction of the stator. The stator mould is connected to the vertical runner 5 by a feeding head 3. This has improved the pouring efficiency greatly, makes the feeding ability maximize of runner.
As shown in fig. 3 and 4, the wall thickness of the stator mold is uniformly increased from the far side 2 to the near side 1. In the present embodiment, the wall surface of the stator mold increases the wall thickness margin in an involute form from the far side 2 to the near side 1, that is, the outer circumference of the outer wall of the stator mold has an involute profile 4, and the feeding margin is increased in an involute form. The wall of the near side 1 close to the pouring channel is thicker, and the wall of the far side 2 far away from the pouring channel is thinner, so that the uniform wall thickness is formed and the sequential solidification is realized, and the feeding channel is smooth.
Based on the casting mold and the stator mold shown in fig. 1-4, the invention is based on the flow chart shown in fig. 5: preparing slurry, preparing a wax mould, manufacturing a shell, dewaxing, cleaning, roasting, and casting.
S1: a slurry is prepared.
The shell of the present invention is designed to be multi-layered, and the shrinkage rate of each layer requires preparation of a plurality of different slurries to form a plurality of different shell layers surrounding the wax pattern. In this example, the slurries were three: surface layer slurry, transition layer slurry and back layer slurry. The facing slurry is a homogeneous mixture of zircon powder and quick-drying silica sol. The transition layer slurry is a uniform mixture of fused silica powder and quick-drying silica sol. The backing layer slurry was a homogeneous mixture of mullite powder and quick-drying silica sol.
The shrinkage rates of the three main materials, zircon powder, fused silica powder and mullite powder, are different. After the shell is prepared and molded, because the shrinkage rates of the three shell main materials are different, the shell can generate tiny cracks, so that the surface shell material can be quickly removed after the part is molded and when the part is cleaned. And the residual shell refractory material on the surface of the part can be easily cleaned by adopting common shot blasting or shot blasting equipment. Cracks are generated in the cooling process, so that the molding sand at the inner hole spiral part can be very easily cleaned after the stator workpiece is cooled.
S2: and (5) preparing a wax mould. And (4) pressing the stator wax pattern by a wax pressing machine through the mould according to the casting mould.
S3: and manufacturing a primary shell to obtain a multi-layer shell inner hole structure and an outer wall surface structure.
(301) And (3) immersing the wax mould into the surface layer slurry of S1, uniformly scattering zircon sand on the surface of the wax mould, and drying. In this embodiment, the zircon sand has a fineness of 80 to 100 meshes and is dried for 3 to 4 hours. Namely, the wax mold is immersed into the surface layer slurry, then taken out, uniformly sprinkled with 80-100 meshes of zircon sand on the surface, and dried for 3-4 hours to obtain the first layer of the shell. The first layer directly contacts the outer surface of the part to obtain a smooth-surfaced stator part, and the roughness of the surface of the part can reach Ra3.2.
(302) Repeat (301) again, resulting in a second layer.
(303) And (3) immersing the wax mould into the transition layer slurry, uniformly scattering mullite sand on the surface after the wax mould is taken out, and drying. In the embodiment, the mullite sand has the fineness of 60-80 meshes and is dried for 3-4 hours. Namely, the wax mold is immersed into the slurry of the transition layer, then taken out, uniformly sprinkled with 60-80-mesh mullite sand on the surface, and dried for 3-4 hours to obtain the third layer of the shell.
(304) Repeat (303) again to get a fourth layer.
S4: and (4) blocking two ends of the inner hole of the primary shell after the step S3 by using a sealing piece.
After S3, the number of layers of the inner hole of the primary shell is the same as the number of layers of the outer wall surface, and the number of layers is at least four. Then, the color bar foam is plugged into the inner hole to block the inlet and outlet of the inner hole, so that the slurry is prevented from entering the inner hole, and the number of layers of the inner hole is four all the time.
S5: and (5) manufacturing a finished shell, and continuously increasing the layer number of the outer wall surface of the shell.
(501) And (3) immersing the wax pattern into the back layer slurry, uniformly scattering mullite sand on the surface after taking out, and drying. In the embodiment, the fineness of the mullite sand is 20-40 h, 2-3 h. Namely, the wax mold is immersed into the back layer slurry, mullite sand of 20-40 meshes is uniformly scattered on the surface of the wax mold, and the fifth layer of the outer wall surface of the shell is obtained after drying for 2-3 hours.
(502) And repeating the step (501) to obtain a sixth layer of the outer wall surface of the shell.
According to the process of manufacturing the shells S3, S4 and S5, the inner wall surface of the stator casting shell has four layers in total, and the outer wall surface of the stator casting shell has 6 layers in total, so that the elements such as the roughness of the part surface, the operability of shell cleaning, the shrinkage rate of a shell material, gaps and the like are fully considered. The number of the inner hole wall surfaces is less than that of the outer wall surfaces of the shell, the inner hole wall surface of the shell becomes thin, and the cooling speed in pouring is improved. Then matching with involute feeding allowance of stator wall thickness to make stator produce perfect sequential solidification, and cooling to obtain uniform compact structure.
When other parts are prepared or the processing flow is improved by using the investment precision casting method, the total layer number of the shell, the transition layer number, the back layer number, the drying time and the like can be adjusted according to the requirements, the utilization rate of materials is improved, and the cost of the shell is reduced.
S6: and dewaxing and cleaning to remove wax materials in the shell.
Dewaxing of the shell is first performed. And (3) putting the shell of S3 into a dewaxing kettle, and keeping the shell at the temperature of 170-180 ℃ and the steam pressure of 0.6-0.7 MPa for 10-12 minutes. Removing the wax material in the shell. After dewaxing, steam is slowly discharged (the time is not less than 60 seconds).
Next, the shell is cleaned. And (3) injecting tap water into the dewaxed shell, putting the shell into the dewaxing kettle again, and keeping the shell for 3-5 minutes at the temperature of 170-180 ℃ and under the steam pressure of 0.6-0.7 MPa. And (5) quickly discharging steam (the time is not more than 10 seconds), and completely cleaning the residual wax materials of the shell. A
S7: and (4) roasting, namely putting the shell of the S4 into a roasting furnace for roasting.
The roasting environment of the shell is as follows: the temperature of the roasting furnace is 950-1000 ℃, the roasting time is 120min, and residual water and wax in the shell are removed.
S8: and (3) forming parts, namely pouring the alloy into the shell at a set temperature to obtain the stator parts.
And after the roasting time of the shell is up, refining the alloy required by the stator, and pouring the alloy into the shell at a set temperature of 1640-1650 ℃ to obtain the stator part with the pouring gate. And removing the pouring channel, polishing and removing the flash burrs on the surface of the part to obtain the stator product with the required shape.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (9)
1. The utility model provides an investment casting mould of screw pump stator, its characterized in that, the investment casting mould adopts vertical runner, and its both sides are provided with a stator mould respectively, the stator mould orientation one side that vertical runner was for the near side, the stator mould is kept away from one side that vertical runner was for the far side, the near side is provided with a plurality of feeding risers, the stator mould passes through feeding riser is connected to vertical runner, the wall thickness of stator mould is from the far side to the even bodiness of near side, the shell of stator mould, the thickness of its inner bore wall is less than the thickness of its outer wall.
2. The investment casting mold for a screw pump stator according to claim 1, wherein the wall surface of the stator mold increases in wall thickness margin in an involute form from a distal side to a proximal side.
3. The investment casting mold for a screw pump stator according to claim 1, wherein the number of layers of the inner wall surface of the shell is smaller than the number of layers of the outer wall surface thereof, the number of layers of the inner wall surface is four, and the number of layers of the outer wall surface is six.
4. An investment casting method using a screw pump stator according to any one of claims 1 to 3, comprising the steps of:
s1: preparing slurry, wherein the surface layer slurry is a uniform mixture of zircon powder and quick-drying silica sol; the transition layer slurry is a uniform mixture of fused quartz powder and quick-drying silica sol; the back layer slurry is a homogeneous mixture of mullite powder and quick-drying silica sol;
s2: preparing a wax mould, and preparing the wax mould of the stator by using a wax pressing machine;
s3: manufacturing a primary shell, immersing the wax mold into the surface layer slurry for multiple times, uniformly scattering zircon sand on the surface after each taking out, and immersing again after each taking out and drying; immersing the wax mould into the transition layer slurry for multiple times, uniformly scattering mullite sand on the surface after each taking out, and immersing again after each taking out and drying;
s4: blocking two ends of the inner hole of the primary shell after the step S3 by using a sealing piece;
s5: manufacturing a finished shell, namely immersing the wax mold obtained in the step S4 into the back layer slurry for multiple times, uniformly scattering mullite sand on the surface after each taking out, and immersing again after each taking out and drying; obtaining a shell wrapping the wax mould;
s6: dewaxing and cleaning, and removing wax materials in the shell;
s7: roasting, namely placing the shell of S6 into a roasting furnace for roasting;
s8: and (3) forming parts, namely pouring the alloy into the shell at a set temperature to obtain the stator parts.
5. The investment casting method of a screw pump stator according to claim 4, wherein the inner bore of the primary shell is filled with solid foam to block the inlet and outlet of the inner bore at step S4.
6. The investment precision casting method of the screw pump stator according to claim 4, wherein in step S3, the number of layers of the inner hole and the outer wall surface of the primary shell is at least four, the first layer is that the wax mold is immersed into the surface layer slurry, zircon sand is uniformly spread on the surface of the wax mold, and the wax mold is dried for 3-4 hours; the second layer is the same as the first layer; the third layer is that the wax mould is immersed into the slurry of the transition layer, and the mullite sand is uniformly scattered on the surface of the wax mould, and the wax mould is dried for 3 to 4 hours; the fourth layer is the same as the third layer.
7. The investment precision casting method of the spiral pump stator according to the claim 6, wherein in the step S5, the outer wall surface of the finished shell has at least a fifth layer and a sixth layer, the fifth layer is that the wax pattern is immersed into the back layer slurry, the Moire sand is uniformly spread on the surface of the wax pattern, and the drying is carried out for 2-3 h; the sixth layer is the same as the fifth layer.
8. The investment casting method of a screw pump stator according to claim 4, wherein in step S7, the baking environment of the shell is: the temperature of the roasting furnace is 950-1000 ℃, and the roasting time is 120 min.
9. The investment casting method for a stator of a screw pump according to claim 4, wherein the set temperature is 1640 ℃ to 1650 ℃ in step S8.
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| CN202010745814.3A CN112091173B (en) | 2020-07-29 | 2020-07-29 | Precision investment casting mold and casting method for spiral pump stator |
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| CN202010745814.3A CN112091173B (en) | 2020-07-29 | 2020-07-29 | Precision investment casting mold and casting method for spiral pump stator |
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| CN101823139A (en) * | 2009-03-03 | 2010-09-08 | 上海华新合金有限公司 | Casting method of low-alloy hydraulic pump stator casting |
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| CN110181001A (en) * | 2019-07-08 | 2019-08-30 | 鹰普航空零部件（无锡）有限公司 | A kind of precision casting process of superalloy turbine |
| CN209811161U (en) * | 2019-03-19 | 2019-12-20 | 上海烟草机械新场铸造有限责任公司 | Mold core for stator frame mold |
| CN110842147A (en) * | 2019-11-29 | 2020-02-28 | 西安航天发动机有限公司 | Method for controlling size of closed impeller investment precision casting runner |
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| US7967559B2 (en) * | 2007-05-30 | 2011-06-28 | General Electric Company | Stator-rotor assembly having surface feature for enhanced containment of gas flow and related processes |
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| CN101823139A (en) * | 2009-03-03 | 2010-09-08 | 上海华新合金有限公司 | Casting method of low-alloy hydraulic pump stator casting |
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Effective date of registration: 20211112 Address after: 214000 No. 7, Fengyuan Road, Xinqiao Town, Jiangyin City, Wuxi City, Jiangsu Province Applicant after: Jiangsu Liancheng Precision Alloy Technology Co.,Ltd. Address before: 214000 No. 2, Dongyuan Road, Xinqiao Town, Jiangyin City, Wuxi City, Jiangsu Province Applicant before: JIANGYIN XINLIAN METAL PRODUCTS Co.,Ltd. |
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Denomination of invention: A kind of investment precision casting mould and casting method of screw pump stator Effective date of registration: 20220902 Granted publication date: 20220621 Pledgee: Jiangyin branch of Bank of China Ltd. Pledgor: Jiangsu Liancheng Precision Alloy Technology Co.,Ltd. Registration number: Y2022980014365 |