CN114378252A - Casting mold and casting method for titanium alloy centrifugal pump body - Google Patents
Casting mold and casting method for titanium alloy centrifugal pump body Download PDFInfo
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- CN114378252A CN114378252A CN202111510641.8A CN202111510641A CN114378252A CN 114378252 A CN114378252 A CN 114378252A CN 202111510641 A CN202111510641 A CN 202111510641A CN 114378252 A CN114378252 A CN 114378252A
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- centrifugal pump
- pump body
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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
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- 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
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
- B22C9/103—Multipart cores
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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
- B22C9/24—Moulds for peculiarly-shaped castings for hollow articles
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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
- B22D15/00—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor
- B22D15/02—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor of cylinders, pistons, bearing shells or like thin-walled objects
Abstract
The invention belongs to the technical field of titanium alloy casting, and particularly relates to a casting mold and a casting method of a titanium alloy centrifugal pump body, wherein the casting mold comprises a molding box and a mold core, the molding box comprises an upper box and a lower box, and the upper box and the lower box are correspondingly buckled to form a cavity matched with the outer profile of the centrifugal pump body; the upper box is also provided with a plurality of risers communicated with the cavity; the core is arranged in the cavity and comprises a sand core and a chill core, and the chill core is arranged in the lower box and is matched with the inner molded surface and the end surface of the assembly flange in the centrifugal pump body; the sand core seat is arranged in the cold iron core and is matched with the inner profiles of the volute flow channel, the inlet flange and the outlet flange in the centrifugal pump body. By arranging the sand core and the chill core, the forming of a complex inner cavity is effectively ensured, and the thick and large hot spot at the lower end assembly flange of the casting is chilled by the chill core, so that the modulus at the hot spot is reduced, the casting is sequentially solidified in the pouring process, and the formation of shrinkage cavities is avoided.
Description
Technical Field
The invention belongs to the technical field of titanium alloy casting, and particularly relates to a casting mold and a casting method of a titanium alloy centrifugal pump body.
Background
The titanium alloy centrifugal pump body has good corrosion resistance, has good stability in various media including various acids, alkalis, salts, organic matters and aqueous solutions, and is widely applied to chemical industry and other industries with corrosion resistance requirements; the centrifugal pump body is used as an important component of a mechanical pump, the requirement on the internal quality is high, the casting is not allowed to have the defects of shrinkage cavity, crack, inclusion and the like, a hydrostatic test is required, and the phenomena of water seepage and water leakage are not allowed.
The titanium alloy centrifugal pump body is complex in structure and can be roughly divided into a volute flow channel 1, an inlet flange 3, an outlet flange 4, an assembly flange 2 and a bottom foot 5. FIG. 1 shows a typical pump body made of pure titanium, the maximum profile size of the part is 600mm, the mass is about 60kg, the wall thickness difference of each part is large, the inner cavity of a volute flow channel 1 is large and complex in shape, the thickness is about 8mm, the thicknesses of an inlet flange 3, an outlet flange 4 and a foot 5 are about 25mm, an assembly end flange is an important processing surface, the thickness is about 40mm, and the inner quality of a casting needs to meet the ASTM E1320 Grade 7 standard.
In the prior art, a graphite type is generally machined in a casting method of a titanium alloy centrifugal pump body, because the graphite material has smooth surface, light specific gravity, higher strength, low hardness and depression cutting machining forming, and because the graphite type has strong chilling capability, the shrinkage cavity defect of a casting can be reduced; however, the graphite mold is difficult to recycle, and the cost of the graphite mold is increased sharply due to the national environmental protection importance, which increases the casting cost. The common sand casting process of the centrifugal pump castings is wood pattern generation and two-box modeling, the inner cavity of the centrifugal pump body is formed by sand molds, and middle injection type pouring is performed, because a hot joint of an assembly flange at the lower end of the centrifugal pump body casting is positioned in a lower box of a casting mold, feeding cannot be performed through a riser, shrinkage cavities are generated in a thick and large area, due to the fact that the shrinkage cavities are large in size, compaction cannot be performed through hot pressing, defect repair welding treatment needs to be cleaned, great cost burden is caused for production, meanwhile, pits of some castings are positioned in the inner cavity of a volute flow channel of the pump body, welding treatment is difficult to perform, and leakage is easily generated when the centrifugal pump body normally works if defects are not eliminated.
Disclosure of Invention
The invention aims to provide a casting mold and a casting method for a titanium alloy centrifugal pump body, which aim to solve the problems existing in the prior art when the titanium alloy centrifugal pump body is cast.
The invention provides a casting mould of a titanium alloy centrifugal pump body, which comprises: the molding box comprises an upper box and a lower box, and the upper box and the lower box are correspondingly buckled to form a cavity matched with the outer profile of the centrifugal pump body; the upper box is also provided with a plurality of risers communicated with the cavity; the core is arranged in the cavity and comprises a sand core and a cold iron core, and the cold iron core is arranged in the lower box and is matched with the inner molded surface and the end surface of the assembling flange in the centrifugal pump body; the sand core seat is arranged in the cold iron core and is matched with the inner profiles of the volute flow channel, the inlet flange and the outlet flange in the centrifugal pump body.
The casting mold for the titanium alloy centrifugal pump body is further preferably characterized in that the chill core comprises a construction bowl and a construction ring; the lower surface of the structural bowl is matched and positioned with the lower box, the upper surface of the structural bowl is matched and positioned with the sand core, and the outer peripheral surface of the structural bowl is matched with the inner profile of the assembly flange; the structure ring is sleeved on the periphery of the structure bowl and is integrally formed with the structure bowl, and the upper surface of the structure ring is matched with the end face of the assembling flange.
In the casting mold for a titanium alloy centrifugal pump body described above, it is further preferable that a ratio of a thickness of the side wall of the structural bowl and the structural ring to a thickness of the titanium alloy centrifugal pump body mounting flange is 1.0 to 1.3.
In the casting mold for a titanium alloy centrifugal pump body described above, it is more preferable that the cold iron core is a graphite core.
In the casting mold for the titanium alloy centrifugal pump body, it is further preferable that the riser comprises a first riser corresponding to an inlet flange in the centrifugal pump body, a second riser corresponding to an outlet flange in the centrifugal pump body, and a third riser corresponding to a foot in the centrifugal pump body.
In the casting mold for the titanium alloy centrifugal pump body described above, it is further preferable that the first riser is an annular riser having an inner diameter of the sand core and an outer diameter of the upper box; the second riser and the third riser are wedge risers.
In the casting mold for a titanium alloy centrifugal pump body described above, it is further preferable that the first riser, the second riser, and the third riser have an inclination of 5 to 15 °.
The casting mold for the titanium alloy centrifugal pump body further preferably comprises the following raw materials in parts by mass: 45-55 parts of bauxite sand with the grain size of 0.18-0.25mm, 30-40 parts of bauxite powder with the grain size of 0.074mm and 10-20 parts of silica sol.
The invention also discloses a casting method of the titanium alloy centrifugal pump body, which is realized by using any one of the casting molds of the titanium alloy centrifugal pump body, and comprises the following steps: s1: manufacturing an upper box, a lower box, a sand core and a cold iron core, wherein chambers of the upper box and the lower box are matched with the outer profile of the centrifugal pump body, the cold iron core is matched with the end surface and the inner profile of an assembly flange of the centrifugal pump body, and the sand core is matched with the inner profiles of a volute flow channel, an inlet flange and an outlet flange in the centrifugal pump body; s2: taking and assembling an upper box, a lower box, a sand core and a cold iron core to form a cavity matched with the centrifugal pump body; s3: pouring titanium alloy into the cavity, and standing until the titanium alloy is solidified and molded to obtain a titanium alloy casting mold; s4: and cleaning the titanium alloy casting mold, blowing sand, cutting a casting head and detecting by X-ray to obtain the titanium alloy centrifugal pump body.
In the method for casting a titanium alloy centrifugal pump body as described above, it is more preferable that S1 further includes: and (3) placing the graphite core in a vacuum furnace with the pressure of less than 6Pa for heating until the temperature reaches 900 ℃, preserving the heat for 2.5 hours, cooling along with the furnace, stopping vacuumizing when the temperature is reduced to 400 ℃, and continuing to naturally cool in the furnace.
Compared with the prior art, the invention has the following advantages:
according to the casting mold of the titanium alloy centrifugal pump body, the sand core and the cold iron core are arranged, so that the sand core is matched with the inner cavity of the volute flow channel of the centrifugal pump body, the molding of the complex inner cavity is effectively guaranteed, the cold iron core is matched with the assembling flange of the centrifugal pump body, the cold iron is used for chilling the thick and large hot spot at the assembling flange of the centrifugal pump body, the modulus of the hot spot is reduced, meanwhile, the titanium alloy centrifugal pump body casting is sequentially solidified in the pouring process, and the formation of shrinkage cavities is avoided. Meanwhile, the sand core and the chill core are used in a combined mode, the problem of high cost caused by the fact that the chill core forming process is completely adopted is solved, and the problem that shrinkage cavities at the hot section of the assembling flange in the sand casting process cannot be eliminated is solved. In addition, the manufacturing process of the casting die is simple, and the matching precision of the sand core and the cold iron core is high, so that the size of the casting is ensured.
The cold iron core is a graphite core and adopts a random structure, so that the cold iron core has strong heat storage capacity and good chilling effect.
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 described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic perspective view of a titanium alloy centrifugal pump body according to the present invention;
FIG. 2 is a schematic sectional view of a casting mold for a titanium alloy centrifugal pump body according to the present invention;
FIG. 3 is a flow chart of a method for casting a titanium alloy centrifugal pump body according to the present invention.
Description of reference numerals:
1-volute flow channel, 2-assembly flange, 3-inlet flange, 4-outlet flange, 5-bottom foot, 6-upper box, 7-lower box, 8-graphite core, 9-cold iron core, 10-cavity, 11-first riser and 12-second riser.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood 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.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the terms in the present invention can be understood in a specific case to those skilled in the art.
The structure of the casting mold for titanium alloy centrifugal pump bodies and the casting method for titanium alloy centrifugal pump bodies according to some embodiments of the present invention will be described with reference to fig. 1 to 3.
As shown in fig. 2, the casting mold for the titanium alloy centrifugal pump body provided by the embodiment includes a molding box and a core, wherein the molding box includes an upper box 6 and a lower box 7, and the upper box 6 and the lower box 7 are correspondingly buckled to form a cavity adapted to the outer profile of the centrifugal pump body; the upper box 6 is also provided with a plurality of risers communicated with the cavity; the core is arranged in the cavity and comprises a sand core and a chill core 9, and the chill core 9 is arranged in the lower box 7 and is matched with the inner molded surface and the end surface of the assembly flange 2 in the centrifugal pump body; the sand core seat is arranged in the cold iron core 9 and is matched with the inner profiles of the volute flow channel 1, the inlet flange and the outlet flange 4 in the centrifugal pump body. Namely, in the embodiment, the upper box 6, the lower box 7, the sand core and the chill core 9 are assembled to form a cavity 10 which is consistent with the shape of the titanium alloy centrifugal pump body for the casting molding of the titanium alloy centrifugal pump body.
Specifically, in order to conveniently set the core, the parting surfaces of the upper box 6 and the lower box 7 are selected at the central position of the volute flow channel 1 of the titanium alloy centrifugal pump body according to the principle that an important processing surface is located in the lower box 7 as much as possible and the solidification sequence is determined, and the assembling flange 2 is located in the lower box 7. The runner is a sprue and is provided on the parting surface of the upper case 6 and the lower case 7 so that the ingate is introduced from the parting surface of the upper case 6 and the lower case 7. Meanwhile, the upper box 6 is also provided with a plurality of risers communicated with the cavity, so that feeding is carried out on a hot spot thick area of the titanium alloy centrifugal pump body in the upper box 6. And aiming at the thick area of the assembly flange 2 which can not be fed through a riser in the lower box 7, the cold iron core 9 is additionally arranged, the cooling speed of the casting is increased by utilizing the cold iron, and shrinkage cavities and shrinkage porosity are reduced at the position where the riser is difficult to feed.
Further, in the embodiment, the chill core 9 comprises a structural bowl and a structural ring which are integrally formed, and the structural ring is sleeved outside the structural bowl; the lower surface of the structure bowl and the structure ring is matched and positioned with the lower box 7, the inner cavity and the upper surface of the structure bowl are matched and positioned with the end part of the sand core, the outer surface of the structure bowl is matched with the inner profile of the assembly flange 2, and the upper surface of the structure ring is matched with the lower end surface of the assembly flange 2. Through the structure, the cold iron core 9, the lower box 7 and the sand core are positioned. Preferably, in this embodiment, the chill core 9 is a graphite core 8, that is, a graphite material is used as the chill, on the one hand, the graphite material has the advantages of light specific gravity, high refractoriness and high heat conductivity, so the chilling effect is good, and further, the shrinkage cavity of the casting can be eliminated to play a good role, on the other hand, the processing precision of graphite is high, and by means of the structure, the positioning of the graphite core 8, the lower box 7 and the sand mold can be more accurate, and the defect of casting eccentricity is avoided to a certain extent. In addition, the structure can be completely taken out after die parting, and further, the repeated utilization is realized. In practical application, the sizes of all parts in the cold iron core 9 are optimally designed according to a modulus method or a thermal pitch circle proportion method in cooperation with PROCAST software simulation, specifically, the design thickness of the cold iron core 9 at least meets 1.0-1.3 of the thickness of the titanium alloy cold iron fed part, namely, in the embodiment, the ratio of the thickness of the side wall of the structural bowl and the structural ring to the thickness of the titanium alloy centrifugal pump body mounting flange 2 is 1.0-1.3.
Further, in the present embodiment, the risers include a first riser 11 corresponding to the inlet flange 3 in the centrifugal pump body, a second riser 12 corresponding to the outlet flange 4 in the centrifugal pump body, and a third riser corresponding to the foot 5 in the centrifugal pump body. Specifically, the first riser 11 is located above the cavity 10 of the inlet flange 3, and is an annular riser with a sand core as an inner diameter and an upper box 6 as an outer diameter, and the outer diameter of the first riser 11 is larger than the outer diameter of the inlet flange 3. The second riser 12 and the third riser are free-form wedge risers. And for better feeding, the inclination of the first feeder 11, the second feeder 12 and the third feeder is set to 9 °, although the inclination may be any value from 5 to 15 °.
Further, this embodiment also discloses the preparation raw materials of psammitolite and type box, specifically, according to the mass fraction calculation, the preparation raw materials of psammitolite and type box include: 45-55 parts of bauxite sand with the grain size of 0.18-0.25mm, 30-40 parts of bauxite powder with the grain size of 0.074mm and 10-20 parts of silica sol.
Specifically, the embodiment also discloses specific design data of a casting model of the titanium alloy centrifugal pump body in fig. 1, wherein the thickness of the side wall of the structural bowl and the thickness of the structural ring in the graphite core 8 are 50mm, the heat storage capacity is strong, the chilling effect is good, and the thickness of the bottom of the structural bowl is 20mm, so that the strength of the graphite core 8 can be ensured, and the weight of the graphite core 8 is reduced to a certain extent; the diameter of the pouring gate is 70mm, the outer diameter single side of the first dead head 11 is 10mm larger than the outer diameter of the inlet flange 3, and the height is 50 mm; the height of the second riser 12 is 80mm, and the height of the third riser is 100 mm.
Further, as shown in fig. 3, the present embodiment further discloses a casting method of the titanium alloy centrifugal pump body, specifically, the casting method is implemented by using a casting mold of the titanium alloy centrifugal pump body, and includes:
s1: manufacturing an upper box 6, a lower box 7, a sand core and a cold iron core 9, wherein the chambers of the upper box 6 and the lower box 7 are matched with the outer profile of the centrifugal pump body, the cold iron core 9 is matched with the end surface and the inner profile of an assembly flange 2 of the centrifugal pump body, and the sand core is matched with the inner profiles of a volute flow channel 1, an inlet flange and an outlet flange 4 in the centrifugal pump body;
s2: taking and assembling an upper box 6, a lower box 7, a sand core and a chill 9, so that the upper box 6, the lower box 7, the sand core and the chill 9 form a cavity 10 matched with the centrifugal pump body;
s3: pouring titanium alloy into the cavity 10, and standing until the titanium alloy is solidified and molded to obtain a titanium alloy casting mold;
s4: and cleaning the titanium alloy casting mold, blowing sand, cutting a casting head and detecting by X-ray to obtain the titanium alloy centrifugal pump body.
Specifically, in S1, 45-55 parts of bauxite sand with the particle size fraction of 0.18-0.25mm, 30-40 parts of bauxite powder with the particle size fraction of 0.074mm and 10-20 parts of silica sol are prepared into a mixture, and then a mold is adopted to prepare a sand core and a molding box; after drying for 48 hours, placing the sand core and the molding box in an environment with the temperature of 400 ℃ for roasting for 5 hours; after the titanium alloy surface ceramic is cooled, high inert surface coatings are brushed on the outer surface of the sand core, the inner surface of the molding box and other parts which are in contact with the titanium alloy molten metal, and then the sand core and the molding box are continuously roasted in a high-temperature environment at 1100 ℃ until the surfaces of the sand core and the molding box are ceramized; and naturally cooling to 200 ℃, and then assembling the casting mold. The molding box and the sand core obtained by processing in the steps have the characteristics of high casting strength, high temperature resistance, good thermal shock resistance stability, high chemical stability and the like, and can bear the high temperature of about 1700 ℃ without deformation.
S1 further comprises the steps of processing the graphite core 8 according to the design drawing, then placing the graphite core 8 in a vacuum furnace with the pressure of less than 6Pa for heating until the temperature reaches 900 ℃, preserving heat for 2.5 hours, then cooling along with the furnace, stopping vacuumizing when the temperature is reduced to 400 ℃, and continuing to cool naturally in the furnace. The graphite core 8 after forming processing contains certain ash content, gas and moisture are easy to adsorb at normal temperature, the mould box and the core are prone to separate out gas and moisture during pouring, the gas and the moisture react with titanium alloy melt, casting defects of castings can be caused, and the step is suitable for removing the impurities in a vacuum furnace through high-temperature heating and degassing before pouring.
In S4, X-ray detection is mainly used for detecting whether shrinkage cavities exist at the thick and large thermal junctions of the titanium alloy casting mold through X-ray detection, and the casting mold with defects is removed to obtain the qualified titanium alloy centrifugal pump body.
In addition, the core of the casting mold based on the casting method in the present embodiment is a composite structure of the sand mold and the chill 9, and therefore, it also has the above-described advantageous effects of the casting mold.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A casting mould of titanium alloy centrifugal pump body, characterized by, includes:
the molding box comprises an upper box and a lower box, and the upper box and the lower box are correspondingly buckled to form a cavity matched with the outer profile of the centrifugal pump body; the upper box is also provided with a plurality of risers communicated with the cavity;
the core is arranged in the cavity and comprises a sand core and a cold iron core, and the cold iron core is arranged in the lower box and is matched with the inner molded surface and the end surface of the assembling flange in the centrifugal pump body; the sand core seat is arranged in the cold iron core and is matched with the inner profiles of the volute flow channel, the inlet flange and the outlet flange in the centrifugal pump body.
2. The casting mold for a titanium alloy centrifugal pump body according to claim 1, wherein the cold iron core comprises a build bowl and a build ring; the lower surface of the structural bowl is matched and positioned with the lower box, the upper surface of the structural bowl is matched and positioned with the sand core, and the outer peripheral surface of the structural bowl is matched with the inner profile of the assembly flange; the structure ring is sleeved on the periphery of the structure bowl and is integrally formed with the structure bowl, and the upper surface of the structure ring is matched with the end face of the assembling flange.
3. The casting mold for titanium alloy centrifugal pump bodies according to claim 2, wherein the ratio of the thickness of the side wall of the construction bowl and the construction ring to the thickness of the titanium alloy centrifugal pump body mounting flange is 1.0-1.3.
4. The casting mold for a titanium alloy centrifugal pump body according to claim 3, wherein the cold iron core is a graphite core.
5. The casting mold for a titanium alloy centrifugal pump body according to claim 1, wherein said risers comprise a first riser corresponding to an inlet flange in said centrifugal pump body, a second riser corresponding to an outlet flange in said centrifugal pump body, and a third riser corresponding to a foot in said centrifugal pump body.
6. The casting mold for the titanium alloy centrifugal pump body according to claim 5, wherein the first riser is an annular riser having the sand core as an inner diameter and the upper box as an outer diameter; the second riser and the third riser are both wedge-shaped risers.
7. The casting mold for a titanium alloy centrifugal pump body according to claim 6, wherein the inclination of said first riser, said second riser and said third riser is 5-15 °.
8. The casting mold for the titanium alloy centrifugal pump body according to claim 1, wherein the raw materials for preparing the sand core and the molding box comprise, in parts by mass:
45-55 parts of bauxite sand with the grain size of 0.18-0.25mm, 30-40 parts of bauxite powder with the grain size of 0.074mm and 10-20 parts of silica sol.
9. A method for casting a titanium alloy centrifugal pump body, which is carried out by using the casting mold for a titanium alloy centrifugal pump body according to any one of claims 1 to 8, comprising:
s1: manufacturing an upper box, a lower box, a sand core and a cold iron core, wherein chambers of the upper box and the lower box are matched with the outer profile of the centrifugal pump body, the cold iron core is matched with the end surface and the inner profile of an assembly flange of the centrifugal pump body, and the sand core is matched with the inner profiles of a volute flow channel, an inlet flange and an outlet flange in the centrifugal pump body;
s2: taking and assembling an upper box, a lower box, a sand core and a cold iron core to form a cavity matched with the centrifugal pump body;
s3: pouring titanium alloy into the cavity, and standing until the titanium alloy is solidified and molded to obtain a titanium alloy casting mold;
s4: and cleaning the titanium alloy casting mold, blowing sand, cutting a casting head and detecting by X-ray to obtain the titanium alloy centrifugal pump body.
10. The method for casting a titanium alloy centrifugal pump body according to claim 9, wherein S1 further includes: and (3) placing the graphite core in a vacuum furnace with the pressure of less than 6Pa for heating until the temperature reaches 900 ℃, preserving heat for 2.5 hours, cooling along with the furnace, stopping pressure maintaining when the temperature is reduced to 400 ℃, and continuing to naturally cool in the furnace.
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