Strong wear-resistant, anti-erosion screw drill motor and preparation method

Abstract

The application discloses a kind of strong wear-resistant, anti-erosion screw drill motor and preparation method thereof.The screw drill motor includes stator and rotor, the stator is composed of stator matrix and diamond wear-resistant layer A arranged on the inner surface of stator matrix, the rotor is composed of rotor matrix and diamond wear-resistant layer B arranged on the outer surface of rotor matrix, the diamond wear-resistant layer A and diamond wear-resistant layer B are composed of alloy and diamond, the thickness of diamond wear-resistant layer A and diamond wear-resistant layer B is 2-5mm, the stator matrix, rotor matrix and diamond wear-resistant layer are integrally formed by using 3D printing technology, which can improve the precision of screw motor manufacturing, reduce its forming difficulty, improve production efficiency, reduce production cost, the screw drill motor with diamond wear-resistant layer has the advantages of strong wear resistance, anti-erosion, high temperature resistance, corrosion resistance, strong pressure-bearing capacity, etc., which improves the service life of screw drill and expands the range of engineering applications.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of screw drill motor for oil drilling, specifically to a kind of strong wear-resistant, erosion-resistant screw drill motor and preparation method thereof. BACKGROUND

[0002] Screw drill is widely used in downhole power drilling, and motor is the most core part of screw drill. Screw drill motor is composed of stator and rotor. The stator of traditional screw drill motor is made by rubber injection lining in the steel sleeve, which has the disadvantages of low temperature resistance, corrosion resistance, wear resistance and pressure capacity. The rotor is usually made of a steel body by milling, and the outer surface needs to be surface-hardened to improve its wear resistance. The manufacturing process is complex. The stator and rotor of screw drill motor are rubbed against each other during use in downhole, and are eroded by drilling fluid and downhole particles, which reduces the service life of screw drill motor. With the development of drilling industry in recent years, the drilling depth and bottom hole temperature are getting higher and higher, and the requirements for screw drill are getting higher and higher. Therefore, a more wear-resistant and widely applicable screw drill motor is needed to meet the production requirements.

[0003] 3D printing technology belongs to a kind of rapid manufacturing technology, which has attracted widespread attention due to its short product design and manufacturing cycle, ability to manufacture complex parts and high production precision. However, there is no report on using 3D printing method to prepare strong wear-resistant and erosion-resistant screw drill motor. SUMMARY

[0004] In view of the shortcomings of the prior art, the first object of the present application is to provide a strong wear-resistant and erosion-resistant screw drill motor. The screw drill motor provided has the advantages of strong wear resistance, erosion resistance, high temperature resistance, corrosion resistance and long service life.

[0005] The second object of the present application is to provide a preparation method of strong wear-resistant and erosion-resistant screw drill motor.

[0006] In order to achieve the above object, the present application adopts the following technical solutions:

[0007] The screw drill motor of the present application comprises a stator and a rotor. The stator is composed of a stator base and a diamond wear-resistant layer A arranged on the inner surface of the stator base. The rotor is composed of a rotor base and a diamond wear-resistant layer B arranged on the outer surface of the rotor base. The diamond wear-resistant layer A and the diamond wear-resistant layer B are both composed of alloy and diamond. The thickness of the diamond wear-resistant layer A and the diamond wear-resistant layer B is 2-5 mm.

[0008] The screw drill motor provided by this invention has a diamond wear-resistant layer with a thickness of 2-5mm on both the stator base and the rotor base surface, which greatly improves the wear resistance, erosion resistance, high temperature resistance and corrosion resistance of the screw drill motor, thus significantly extending the service life of the screw drill motor.

[0009] In a preferred embodiment, the volume ratio of alloy to diamond in diamond wear-resistant layer A and diamond wear-resistant layer B is 1 to 9:1, and the alloy composition is: 20 to 50% copper, 3 to 7% tin, 20 to 60% tungsten carbide, 1 to 10% nickel, 1 to 6% manganese, and 1 to 15% cobalt.

[0010] The diamond wear-resistant layers A and B provided in this invention are both composed of alloys and diamonds. In the alloy, copper and tin serve as the skeleton materials to provide support, while nickel, cobalt, and manganese serve as alloy materials to improve the performance of the wear-resistant layer matrix. Tungsten carbide mainly enhances the wear resistance of the wear-resistant layer. Under the control of the above components and composition, excellent wear resistance is achieved. The inventors have found that the ratio of raw materials for the wear-resistant layer is very important. If the ratio of pre-made alloy micro powder is not set properly, the wear resistance of the stator and rotor wear-resistant layers will be low, and they will not be able to play a strong wear-resistant and erosion-resistant role.

[0011] In a further preferred embodiment, the diamond wear-resistant layer A and the diamond wear-resistant layer B have the same composition ratio, and the alloy composition is: 30-45% copper, 4-7% tin, 30-40% tungsten carbide, 5-8% nickel, 4-6% manganese, and 5-12% cobalt.

[0012] The inventors discovered that by controlling the composition ratio of diamond wear-resistant layer A to diamond wear-resistant layer B within the above-mentioned range, the provided screw drill motor exhibits the best wear resistance and erosion resistance.

[0013] In a preferred embodiment, the stator substrate and the rotor substrate are made of iron.

[0014] In a preferred embodiment, the rotor is located in the inner cavity of the stator, and the distance from the outer surface of the rotor to the inner surface of the stator is 0.1 to 0.5 mm, with the two being fitted with a clearance fit.

[0015] This invention discloses a method for preparing a screw drill motor. The method involves mixing iron powder with a binder to obtain a stator and rotor mixture. This mixture is then kneaded, granulated, and drawn into stator and rotor filaments. Diamond micro-powder, alloy raw material powder, and a binder are mixed in a designed ratio to obtain a wear-resistant layer mixture. This mixture is then kneaded, granulated, and drawn into wear-resistant filaments. The stator and rotor filaments are printed to obtain stator and rotor green blanks, respectively. Simultaneously, the wear-resistant filaments are printed onto the surface of the stator green blank to obtain a stator green blank, and the same process is repeated. Finally, the stator and rotor green blanks are degreased and sintered sequentially to obtain the screw drill motor.

[0016] In a preferred embodiment, the ratio of iron powder to binder in the stator and rotor mixture is 5 to 20 by mass.

[0017] In a preferred embodiment, the alloy raw material powder has the following composition by mass percentage: 20-50% copper powder, 3-7% tin powder, 20-60% tungsten carbide powder, 1-10% nickel powder, 1-6% manganese powder, and 1-15% cobalt powder.

[0018] In a further preferred embodiment, the alloy raw material powder has the following composition by mass percentage: copper 30-45%, tin 4-7%, tungsten carbide 30-40%, nickel 5-8%, manganese 4-6%, and cobalt 5-12%.

[0019] In a preferred embodiment, the diamond micro powder has a particle size ≤150μm and the alloy raw material powder has a particle size ≤100μm.

[0020] In a preferred embodiment, the wear-resistant layer mixture has a mass ratio of (diamond micro powder + alloy raw material powder): binder of 5 to 20:1.

[0021] In a preferred embodiment, the volume ratio of alloy raw material powder to diamond micro powder in the wear-resistant layer mixture is 1 to 9:1.

[0022] In a preferred embodiment, the binders in the stator and rotor mixture and the wear-resistant layer mixture have the following composition by volume percentage: 30-50% acrylic acid-grafted polyethylene, 15-30% paraffin wax, 20-50% styrene-isoprene-styrene block copolymer, and 5-15% stearic acid.

[0023] In this invention, acrylic acid-grafted polyethylene and styrene-isoprene-styrene block copolymer are used as the skeleton components of the binder. On the one hand, this gives the filament material both flexibility, high elasticity, and rigidity. On the other hand, the degreasing process is carried out with gradient degreasing temperatures according to different binder components, resulting in a high degreasing rate and a relatively complete green body. This avoids the decomposition of a single binder during degreasing, which can generate pores and cause insufficient support of the green body, resulting in degreasing defects such as cracks and collapse. Stearic acid is used as a surfactant to wet the metal powder and improve the binder's ability to coat the metal powder. Paraffin wax is used as a lubricant to give the filament material good flowability, which is convenient for printing. By controlling the composition of the binder within the range of this invention, the prepared filament material has good flexibility, flowability, and uniformity, so as to obtain a green body with uniform performance.

[0024] In the preferred embodiment, during the process of obtaining stator and rotor filaments and wear-resistant layer filaments, the mixing temperature is 180-190℃ and the mixing time is 80-100min.

[0025] In a preferred embodiment, the diameter of the stator and rotor filaments and the wear-resistant layer filaments are both 1.65 to 1.85 mm.

[0026] In this invention, by first preparing filamentous material and then performing melt extrusion molding, the uniformity of the material extruded from the nozzle can be fully guaranteed.

[0027] In a preferred embodiment, the stator and rotor filaments and the wear-resistant layer filaments are placed in the corresponding dual feed ports of a dual-nozzle FDM printer. One nozzle first prints the stator substrate green blank and the rotor substrate green blank, and the other nozzle simultaneously prints the wear-resistant layer set on the surface of the stator substrate green blank and the rotor substrate green blank.

[0028] The inventors discovered that using dual-nozzle printing to integrate the wear-resistant layer and the substrate resulted in the optimal performance of the screw drill motor.

[0029] In the preferred embodiment, the printing parameters during the printing process are as follows: the printing layer thickness is 0.1 to 0.3 mm, the printing platform temperature is 50 to 60°C, and the printing nozzle temperature is 180 to 200°C.

[0030] In actual operation, the stator substrate and its wear-resistant layer model and the rotor substrate and its wear-resistant layer model are created in the 3D modeling software. The models are then imported into the slicing software to set the printing parameters. The final file is then imported into the dual-nozzle FDM printer. Printing is performed according to the set parameters. After printing, the stator blank and rotor blank are obtained.

[0031] In a preferred embodiment, the stator and rotor blanks are first placed in an organic solvent for solvent degreasing, and then thermally degreased under an argon atmosphere.

[0032] In a further preferred embodiment, the organic solvent is cyclohexane, the solvent degreasing temperature is 60℃~80℃, and the solvent degreasing time is 4~6h.

[0033] In a preferred embodiment, the thermal degreasing process is as follows: first, the degreasing furnace is heated to 280–330°C at a heating rate of 2–3°C / min and held at that temperature for 1–2 hours; then, the degreasing furnace is heated to 410–460°C at a heating rate of 0.5–1°C / min; and then, the degreasing furnace is heated to 580–630°C at a heating rate of 2–3°C / min and held at that temperature for 1–2 hours.

[0034] In the thermal degreasing process of this invention, based on the difference in the pyrolysis temperature range of different components of the binder, a gradient heating mode is adopted for stepwise degreasing, which can effectively ensure the integrity of the green body and the removal of the binder in the green body, and avoid degreasing defects.

[0035] In a preferred embodiment, the sintering process involves heating the temperature to 800–1000°C at a rate of 10–80°C / min, holding the temperature for 8–15 minutes, and controlling the sintering pressure to be 1–5 MPa.

[0036] The inventors discovered that the sintering process needs to be effectively controlled. If the sintering temperature is too high, the diamond will graphitize and will not be able to exert its strong wear resistance and erosion resistance. If the holding time is insufficient, the diamond on the wear-resistant layer will easily fall off.

[0037] The beneficial effects achieved by this invention are as follows:

[0038] (1) Using 3D printing technology, a 2-5mm thick diamond wear-resistant layer was added to the outer surface of the rotor and the inner surface of the stator of the screw drill motor, which enhanced the wear resistance, erosion resistance and corrosion resistance of the screw drill motor and improved the service life of the screw drill.

[0039] (2) A diamond wear-resistant layer is formed on the inner surface of the stator of a screw drill motor with strong wear resistance and erosion resistance, which makes the stator have high pressure resistance and high temperature resistance, and is suitable for drilling in complex downhole environments.

[0040] (3) This invention utilizes 3D printing technology to manufacture a screw drill motor that is highly wear-resistant and erosion-resistant, which effectively improves the precision of screw drill motor manufacturing, increases production efficiency, and reduces manufacturing costs. Attached Figure Description

[0041] Figure 1 Stator schematic diagram,

[0042] Figure 2 Rotor schematic diagram

[0043] Figure 3Diagram of screw drill motor engagement.

[0044] Figure 4 Cross-sectional view of a screw motor. Detailed Implementation

[0045] The present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0046] Example 1

[0047] Example: A high-wear-resistant and erosion-resistant screw drill motor comprises a stator and a rotor. The rotor has a major diameter of 79mm and a minor diameter of 59mm, while the stator has a major diameter of 90mm and a minor diameter of 70mm. The stator outer diameter is 120mm. The clearance between the outer surface of the rotor and the inner surface of the stator is 0.5mm. Both the stator and rotor have a height of 100mm, a screw pitch of 100mm, and a diamond wear-resistant layer thickness of 5mm.

[0048] A 3D printing method for a highly wear-resistant and erosion-resistant screw drill motor includes the following steps:

[0049] (1) Wire making: The metal matrix is ​​composed of iron powder; the wear-resistant layer is composed of metal alloy powder and diamond micro powder, with a volume ratio of 9:1; the mass fraction of each component in the metal alloy powder contained in the wear-resistant layer is: copper powder 45%, tin powder 7%, tungsten carbide powder 30%, nickel powder 6%, manganese powder 4%, cobalt powder 8%; the particle size of the metal powder is 62-75μm, and the particle size of the diamond micro powder is 75-100μm; the mass ratio of powder to binder is 20:1; the volume fraction of each component of the binder is: acrylic grafted polyethylene 50%, styrene-isoprene-styrene block copolymer 25%, paraffin wax 15%, stearic acid 10%; the powder and binder are weighed according to the above design ratio.

[0050] The powders for the substrate, the wear-resistant layer, and the binder were mixed separately and then placed in an internal mixer for intensive mixing at 190℃ for 80 minutes. The purpose of intensive mixing was to ensure a tight bond between the powders and the binder. The resulting ductile mixture was then granulated and fed into an extruder to produce composite filaments of 1.75±0.05mm for printing the substrate and wear-resistant layer. These filaments were then drawn and wound on a traction machine.

[0051] (2) Printing model and parameter design: In the UG (NX12.0) modeling software, the stator substrate and its 5mm thick diamond wear-resistant layer model and the rotor substrate and its 5mm thick diamond wear-resistant layer model are respectively established and imported into the slicing software. The substrate and wear-resistant layer are merged, the left nozzle is set to print the substrate and the right nozzle to print the diamond wear-resistant layer, the printing layer thickness is set to 0.2mm, the fill degree is 100%, the printing temperature is 200℃, and the platform temperature is 60℃. The slicing settings are performed and the final file is exported. The final file is imported into the dual-nozzle FDM printer and printed according to the set parameters. After printing, the stator blank and rotor blank are obtained.

[0052] (3) Degreasing: The stator and rotor blanks are first placed in a water bath for solvent degreasing. The degreasing solvent is cyclohexane. The degreasing temperature is 60℃ and the soaking time is 6h. Then, thermal degreasing is carried out in a degreasing furnace with argon gas. The room temperature of the degreasing furnace is raised to 330℃ at a heating rate of 3℃ / min and held for 1h. Then, the room temperature of the degreasing furnace is raised to 460℃ at a heating rate of 1℃ / min and held for 1h. Finally, the room temperature of the degreasing furnace is raised to 630℃ at a heating rate of 3℃ / min and held for 1h. The purpose of degreasing is to remove the binder components in the blank.

[0053] (4) Sintering: After degreasing, the stator and rotor green blanks are placed in a hot pressing sintering equipment, pressurized to 5 MPa, and heated in a sintering furnace from room temperature to 950°C at a heating rate of 80°C / min. The temperature is held for 8 minutes and then cooled to complete the sintering, resulting in a highly wear-resistant and erosion-resistant screw drill stator and rotor. The Vickers hardness of the obtained stator and rotor wear-resistant layer is 1700 hv, which is about 800 hv higher than that of the traditional chrome-plated rotor. Its actual working life exceeds 240 h, which is about 1.4 times higher than that of the traditional screw motor.

[0054] Example 2

[0055] A high-wear-resistant and erosion-resistant screw drill motor comprises a stator and a rotor. The rotor has a major diameter of 89.6 mm and a minor diameter of 73.6 mm, while the stator has a major diameter of 98 mm and a minor diameter of 82 mm, with an outer diameter of 120 mm. The clearance between the outer surface of the rotor and the inner surface of the stator is 0.2 mm. Both the stator and rotor have a height of 100 mm, a screw pitch of 100 mm, and a diamond wear-resistant layer thickness of 3 mm.

[0056] (1) Wire making: The metal matrix is ​​composed of iron powder; the wear-resistant layer is composed of metal alloy powder and diamond micro powder, with a volume ratio of 7:3; the mass fraction of each component in the metal alloy powder contained in the wear-resistant layer is: copper powder 39%, tin powder 6%, tungsten carbide powder 40%, nickel powder 5%, manganese powder 5%, cobalt powder 5%; the particle size of the metal powder is 62-75μm, and the particle size of the diamond micro powder is 75-100μm; the mass ratio of powder to binder is 10:1; the volume fraction of each component of the binder is: acrylic grafted polyethylene 35%, styrene-isoprene-styrene block copolymer 35%, paraffin wax 20%, stearic acid 10%; the powder and binder are weighed according to the above design ratio.

[0057] The powders for the substrate, the wear-resistant layer, and the binder were mixed separately and then placed in an internal mixer for intensive mixing at 185℃ for 90 minutes. The purpose of intensive mixing was to ensure a tight bond between the powders and the binder. The resulting ductile mixture was then granulated, and the granules were fed into an extruder to produce composite filaments of 1.75±0.05mm for printing the substrate and wear-resistant layer. These filaments were then drawn and wound on a traction machine.

[0058] (2) Printing model and parameter design: In the UG (NX12.0) modeling software, the stator substrate and its 3mm thick diamond wear-resistant layer model and the rotor substrate and its 3mm thick diamond wear-resistant layer model are respectively established and imported into the slicing software. The substrate and wear-resistant layer are merged, the left nozzle is set to print the substrate and the right nozzle to print the diamond wear-resistant layer, the printing layer thickness is set to 0.2mm, the fill degree is 100%, the printing nozzle temperature is 190℃, and the platform temperature is 55℃. The slicing settings are performed and the final file is exported. The final file is imported into the dual-nozzle FDM printer and printed according to the set parameters. After printing, the stator blank and rotor blank are obtained.

[0059] (3) Degreasing: The stator and rotor blanks are first placed in a water bath for solvent degreasing. The degreasing solvent is cyclohexane, the degreasing temperature is 70℃, and the soaking time is 5h. Then, thermal degreasing is carried out in a degreasing furnace with argon gas. The room temperature of the degreasing furnace is raised to 300℃ at a heating rate of 2.5℃ / min and held for 1h. Then, the room temperature of the degreasing furnace is raised to 440℃ at a heating rate of 0.8℃ / min and held for 1h. Finally, the room temperature of the degreasing furnace is raised to 600℃ at a heating rate of 2.5℃ / min and held for 1h. The purpose of degreasing is to remove the binder components in the blank.

[0060] (4) Sintering: After degreasing, the stator and rotor green blanks are placed in a hot pressing sintering equipment, pressurized to 3 MPa, and heated in a sintering furnace from room temperature to 900°C at a heating rate of 40°C / min. The temperature is held for 12 minutes and then cooled to complete the sintering, resulting in a highly wear-resistant and erosion-resistant screw drill stator and rotor. The Vickers hardness of the obtained stator and rotor wear-resistant layer is 2000 hv, which is about 1100 higher than that of the traditional chrome-plated rotor. Its actual working life can exceed 300 hours, which is twice that of the traditional screw motor.

[0061] Example 3

[0062] A high-wear-resistant and erosion-resistant screw drill motor comprises a stator and a rotor. The rotor has a major diameter of 79.8 mm and a minor diameter of 47.8 mm, while the stator has a major diameter of 96 mm and a minor diameter of 64 mm, with an outer diameter of 120 mm. The clearance between the outer surface of the rotor and the inner surface of the stator is 0.1 mm. Both the stator and rotor have a height of 100 mm, a screw pitch of 100 mm, and a diamond wear-resistant layer thickness of 2 mm.

[0063] (1) Wire making: The metal matrix is ​​composed of iron powder; the wear-resistant layer is composed of metal alloy powder and diamond micro powder, with a volume ratio of 1:1; the mass fraction of each component in the metal alloy powder contained in the wear-resistant layer is: copper powder 30%, tin powder 4%, tungsten carbide powder 40%, nickel powder 8%, manganese powder 6%, cobalt powder 12%; the particle size of the metal powder is 62-75μm, and the particle size of the diamond micro powder is 75-100μm; the mass ratio of powder to binder is 5:1; the volume fraction of each component of the binder is: acrylic grafted polyethylene 30%, styrene-isoprene-styrene block copolymer 25%, paraffin wax 30%, stearic acid 15%; the powder and binder are weighed according to the above design ratio.

[0064] The powders for the substrate, the wear-resistant layer, and the binder were mixed separately and then placed in an internal mixer for intensive mixing at 180℃ for 100 minutes. The purpose of intensive mixing was to ensure a tight bond between the powders and the binder. The resulting ductile mixture was then granulated and fed into an extruder to produce composite filaments of 1.75±0.05mm for printing the substrate and wear-resistant layer. These filaments were then drawn and wound on a traction machine.

[0065] (2) Printing model and parameter design: In the UG (NX12.0) modeling software, the stator substrate and its 2mm thick diamond wear-resistant layer model and the rotor substrate and its 2mm thick diamond wear-resistant layer model are respectively established and imported into the slicing software. The substrate and wear-resistant layer are merged, the left nozzle is set to print the substrate and the right nozzle to print the diamond wear-resistant layer, the printing layer thickness is set to 0.2mm, the fill degree is 100%, the printing nozzle temperature is 180℃, and the platform temperature is 50℃. The slicing settings are performed and the final file is exported. The final file is imported into the dual-nozzle FDM printer and printed according to the set parameters. After printing, the stator blank and rotor blank are obtained.

[0066] (3) Degreasing: The stator and rotor blanks are first placed in a water bath for solvent degreasing. The degreasing solvent is cyclohexane, the degreasing temperature is 80℃, and the soaking time is 4h. Then, thermal degreasing is carried out in a degreasing furnace with argon gas. The degreasing furnace room temperature is raised to 280℃ at a heating rate of 2℃ / min and held for 1h. Then, the degreasing furnace room temperature is raised to 410℃ at a heating rate of 0.5℃ / min and held for 1h. Finally, the degreasing furnace room temperature is raised to 580℃ at a heating rate of 2℃ / min and held for 1h. The purpose of degreasing is to remove the binder components in the blank.

[0067] (4) Sintering: After degreasing, the stator and rotor green blanks are placed in a hot pressing sintering equipment, pressurized to 3 MPa, and heated in a sintering furnace from room temperature to 860°C at a heating rate of 20°C / min. The temperature is held for 15 minutes and then cooled to complete the sintering, resulting in a highly wear-resistant and erosion-resistant screw drill stator and rotor. The Vickers hardness of the obtained stator and rotor wear-resistant layer is 1400 hv, which is about 500 higher than that of the traditional chrome-plated rotor. Its actual working life can exceed 200 hours, which is twice that of the traditional screw motor.

[0068] Comparative Example 1

[0069] The other conditions were the same as in Example 1, except that the sintering temperature exceeded 1000°C, and the diamond on the wear-resistant layer of the stator and rotor obtained by sintering was found to have graphitized.

[0070] Comparative Example 2

[0071] The other conditions were the same as in Example 3, except that the solvent degreasing time was less than 4 hours, the green blank was not completely degreased, and defects such as voids were found in the sintered stator and rotor.

Claims

1. A method for manufacturing a highly wear-resistant and erosion-resistant screw drill motor, characterized in that: Iron powder is mixed with a binder to obtain a stator and rotor mixture. The stator and rotor mixture is then kneaded, granulated, and drawn into wire to obtain stator and rotor wire materials. Diamond micro powder, alloy raw material powder, and binder are mixed according to the design ratio to obtain a wear-resistant layer mixture. The wear-resistant layer mixture is then kneaded, granulated, and drawn into wire to obtain wear-resistant layer wire materials. The stator and rotor wire materials are printed to obtain stator substrate green blanks and rotor substrate green blanks, respectively. At the same time, the wear-resistant layer wire materials are printed on the surface of the stator substrate green blank to obtain a stator green blank. The wear-resistant layer wire materials are printed on the surface of the rotor substrate green blank to obtain a rotor green blank. The stator green blank and rotor green blank are then degreased and sintered in sequence to obtain a screw drill motor. The alloy raw material powder, by mass percentage, has the following composition: copper powder 20-50%, tin powder 3-7%, tungsten carbide powder 20-60%, nickel powder 1-10%, manganese powder 1-6%, and cobalt powder 1-15%. The binders in the stator and rotor mixture and the wear-resistant layer mixture, by volume percentage, are as follows: 30-50% acrylic acid-grafted polyethylene, 15-30% paraffin wax, 20-50% styrene-isoprene-styrene block copolymer, and 5-15% stearic acid. The stator and rotor blanks are first placed in an organic solvent for solvent degreasing, and then thermally degreased under an argon atmosphere; The organic solvent is cyclohexane, and the solvent degreasing temperature is 60℃~80℃, and the solvent degreasing time is 4~6h; The hot degreasing process is as follows: first, the degreasing furnace is heated to 280-330℃ at a heating rate of 2-3℃ / min and held for 1-2 hours; then, the degreasing furnace is heated to 410-460℃ at a heating rate of 0.5-1℃ / min; and then, the degreasing furnace is heated to 580-630℃ at a heating rate of 2-3℃ / min and held for 1-2 hours. The screw drill motor includes a stator and a rotor. The stator is composed of a stator base and a diamond wear-resistant layer A disposed on the inner surface of the stator base. The rotor is composed of a rotor base and a diamond wear-resistant layer B disposed on the outer surface of the rotor base. Both the diamond wear-resistant layer A and the diamond wear-resistant layer B are composed of alloy and diamond, and the thickness of both the diamond wear-resistant layer A and the diamond wear-resistant layer B is 2~5mm. In the diamond wear-resistant layer A and diamond wear-resistant layer B, the volume ratio of alloy to diamond is 1~9:1, and the composition of the alloy is: copper 20~50%, tin 3~7%, tungsten carbide 20~60%, nickel 1~10%, manganese 1~6%, cobalt 1~15%.

2. The method for manufacturing a highly wear-resistant and erosion-resistant screw drill motor according to claim 1, characterized in that: In the stator and rotor mixture, the ratio of iron powder to binder by mass is 5 to 20:

1. The diamond micro powder has a particle size ≤150μm, and the alloy raw material powder has a particle size ≤100μm; In the wear-resistant layer mixture, by mass ratio, (diamond micro powder + alloy raw material powder): binder = 5~20:1; In the wear-resistant layer mixture, the volume ratio of alloy raw material powder to diamond micro powder is 1~9:

1.

3. The method for manufacturing a highly wear-resistant and erosion-resistant screw drill motor according to claim 1, characterized in that: During the process of obtaining stator and rotor filaments and wear-resistant layer filaments, the mixing temperature is 180-190℃ and the mixing time is 80-100min. The diameter of the stator and rotor filaments and the wear-resistant layer filaments are both 1.65 to 1.85 mm.

4. The method for preparing a highly wear-resistant and erosion-resistant screw drill motor according to claim 1, characterized in that: The stator and rotor wire materials and the wear-resistant layer wire materials are placed in the corresponding dual feed ports of the dual-nozzle FDM printer. First, one nozzle prints the stator substrate green blank and the rotor substrate green blank, and the other nozzle simultaneously prints the wear-resistant layer set on the surface of the stator substrate green blank and the rotor substrate green blank. During the printing process, the printing parameters are as follows: the printing layer thickness is 0.1 to 0.3 mm, the printing platform temperature is 50 to 60°C, and the printing nozzle temperature is 180 to 200°C.

5. The method for manufacturing a highly wear-resistant and erosion-resistant screw drill motor according to claim 1, characterized in that: The sintering process is as follows: the temperature is increased to 800-1000℃ at a heating rate of 10-80℃ / min, held for 8-15 minutes, and the sintering pressure is controlled at 1-5MPa.

6. The method for preparing a highly wear-resistant and erosion-resistant screw drill motor according to claim 1, characterized in that: The stator base and rotor base are made of iron; The rotor is located in the inner cavity of the stator, and the distance from the outer surface of the rotor to the inner surface of the stator is 0.1~0.5mm. The two are fitted with a clearance fit.

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