Manufacturing and designing method of hydraulic split valve for drilling tool

Abstract

The invention provides a manufacturing and designing method of a hydraulic split valve for a drilling tool. The manufacturing and designing method comprises the steps that S1, the liquid inlet and outlet position and height of the hydraulic split valve and the minimum hole channel thickness are determined; s2, the size and shape of a hole channel and the minimum wall thickness of the hole channel of the hydraulic split valve are determined; s3, a process support model is added, and the secondary machining allowance is increased; s4, selecting a substrate material and a powder material for printing, and selecting a printing sequence, a printing direction and a coordinate system; s5, carrying out additive printing on the hydraulic split valve and the test sample; s6, powder cleaning is conducted; s7, overall annealing is conducted; step S8, removing the substrate; s9, a part supporting structure is removed, and metal particles in a hole channel are removed; s10, the internal quality of the part is detected, and the surface quality of the part is detected; s11, the assembly tolerance is determined, and the printing effectiveness is determined; s12, secondary machining is carried out; and S13, surface nitriding is conducted.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and more particularly, to a manufacturing design method for a hydraulic split valve for drilling tools. Background Art

[0002] Hydraulic valves for engineering are components that are operated by liquids and are used to control liquid pressure, flow rate, and direction in hydraulic transmission. According to the functions of hydraulic valves, they can be divided into three categories: pressure control valves, flow control valves, and direction control valves.

[0003] The hydraulic split valve for automatic drilling tools has high performance requirements and complex designs. Traditional casting methods cannot meet its precision requirements, and generally, precision casting is used for valve body manufacturing. However, high-precision casting has high costs, high requirements for the precision of molds, low yield rates of castings, and it is difficult to eliminate internal casting crack defects. Summary of the Invention

[0004] The main objective of the present invention is to provide a manufacturing design method for a hydraulic split valve for drilling tools to solve the problem that the traditional casting method for the hydraulic split valve for automatic drilling tools in the prior art cannot meet its precision requirements.

[0005] To achieve the above object, the present invention provides a manufacturing design method for a hydraulic split valve for a drilling tool, including: Step S1: Determine the liquid inlet and outlet positions, heights, and minimum thicknesses of the channels of the hydraulic split valve according to the maximum working pressure, maximum flow rate, number of channels, and installation position of the hydraulic split valve; Step S2: Based on the selective laser melting process, determine the channel size and morphology and the minimum wall thickness of the channels of the hydraulic split valve to obtain a three-dimensional model of the hydraulic split valve; Step S3: Based on the selective laser melting additive manufacturing process, add a process support model and increase the secondary machining allowance to obtain a printing model of the hydraulic split valve; Step S4: Select the substrate material and powder material for printing, select the printing sequence, printing direction, and coordinate system of the hydraulic split valve, and use layer software to determine the printing path and program; Step S5: Use the selective laser melting process to simultaneously perform additive printing of the hydraulic split valve and the test specimen; Step S6: After printing, perform powder cleaning, remove the non-conformal support during the powder cleaning stage, and perform radiographic inspection on the inside of the channels to determine whether the powder is completely removed; Step S7: Perform overall annealing on the hydraulic split valve and the test specimen together; Step S8: Remove the substrate by wire cutting; Step S9: Through post-processing including wire cutting, remove the part support structure, polish the part support surface, and use vibration post-processing to remove the metal particles inside the channels; Step S10: Perform X-ray inspection on the part to detect the internal quality of the part, and perform fluorescent penetrant inspection on the part to detect the surface quality of the part; Step S11: Use a three-dimensional scanning instrument to detect the external dimensions of the part, determine the assembly tolerance, analyze the machining allowance of the mating surface, and compare and analyze the printing model of the hydraulic split valve to determine the effectiveness of printing; Step S12: Secondary machining; Step S13: Surface nitriding.

[0006] Further, the manufacturing design method for the hydraulic split valve for the drilling tool further includes: In Step S1, the maximum working pressure of the hydraulic split valve is 15 MPa, the maximum flow rate is 3.5 L / s, the number of channels is 3, determine the installation position of the hydraulic split valve to determine the liquid inlet and outlet positions and heights, the channel diameter is 10 mm, and the minimum wall thickness is not less than 5 mm.

[0007] Further, the manufacturing design method for the hydraulic split valve for the drilling tool further includes: In Step S2, through optimization calculation, determine that the channels of the hydraulic split valve are of a gradually changing elliptical shape, the minimum wall thickness of the channels is 3.5 mm, and obtain a three-dimensional structural design model of the hydraulic split valve.

[0008] Further, the manufacturing design method for the hydraulic split valve for the drilling tool further includes: In Step S3, add a process support model at the central axis and the bottom surface of the hydraulic split valve, and add a secondary machining allowance to the circumferential side surface of the hydraulic split valve, and the secondary machining allowance is greater than or equal to 2.5 mm to form a printing model of the hydraulic split valve.

[0009] Furthermore, the manufacturing design method of the hydraulic split valve for drilling tools further includes: in step S4, the selected substrate material is a stainless steel substrate, with its size matching the size of the selective laser melting equipment, a thickness of 30 - 50 mm, a flatness of not more than 0.05, and the selected powder material is 17 - 4PH, with a powder particle size of 10 - 45 μm; C: ≤0.07%; Si: ≤0.07%; Mn: ≤1.0%; P ≤0.04%; S ≤0.015%; Nb + Ta: 0.15 - 0.5%; Ni: 3 - 5%; Mo: ≤0.5%; Cr: 15 - 17.5%; Cu: 3 - 5%; N: ≤0.1%.

[0010] Furthermore, the manufacturing design method of the hydraulic split valve for drilling tools further includes: in step S4, when selecting the printing direction and sequence of the hydraulic split valve, first print the bottom contour from bottom to top, then print the intermediate transition area and the channels, and finally print the valve seat.

[0011] Furthermore, the manufacturing design method of the hydraulic split valve for drilling tools further includes: in step S5, the parameters of the selective laser melting process are: a laser power of 400 - 500 W, a scanning speed of 600 - 800 mm / s, a spot diameter of 0.1 mm, and a printing thickness of 0.04 mm per layer.

[0012] Furthermore, the manufacturing design method of the hydraulic split valve for drilling tools further includes: in step S6, the powder cleaning process is mechanical vibration powder cleaning.

[0013] Furthermore, the manufacturing design method of the hydraulic split valve for drilling tools further includes: in step S7, the overall annealing process is at 600 - 625 °C for two hours of heat preservation.

[0014] Furthermore, the manufacturing design method of the hydraulic split valve for drilling tools further includes: in step S8, when removing the substrate by wire cutting, the cutting height is at least 2 mm above the substrate.

[0015] Furthermore, the manufacturing design method of the hydraulic split valve for drilling tools further includes: in step S9, through manual post - processing, knocking out the part support structure, grinding the part support surface, and removing the metal particles inside the channels on a vibrating table.

[0016] Furthermore, the manufacturing design method of the hydraulic split valve for drilling tools further includes: in step S10, when performing X - ray detection, if cracks and lack - of - fusion defects appear, the part is unqualified inside. The maximum allowable pore size is 1 mm and the number is 4. When performing fluorescent penetrant testing, the surface defects of the part are ground off.

[0017] Further, the manufacturing design method for the hydraulic split valve for drilling tools further includes: in step S11, determining the assembly tolerance by detecting the maximum difference between the external dimension and the printed dimension of the part, and analyzing the machining allowance of the mating surface.

[0018] Further, the manufacturing design method for the hydraulic split valve for drilling tools further includes: in step S13, performing carburizing treatment on the additively printed hydraulic split valve, with the carburized layer depth being 1.0 - 1.5 mm and the surface hardness being 58 - 63 HRC.

[0019] Applying the technical solution of the present invention, through the above - mentioned process steps, during the overall optimization design of the manufactured hydraulic split valve, the mass of the hydraulic split valve is reduced, enabling the manufactured hydraulic split valve to meet the accuracy requirements. Moreover, the entire manufacturing process is relatively simple. Compared with the traditional precision casting method, the method of this embodiment makes the manufacturing cost of the hydraulic split valve lower, effectively eliminates internal defects, and has a higher yield. The method of this embodiment utilizes the selective laser melting technology. By discretizing the part model along a certain direction into a series of ordered micron - scale thin layers, using the laser as the heat source to melt the metal powder layer by layer to directly manufacture the part, it realizes the integrated design and manufacturing of material - structure - function, can machine complex cavity flow channel structures that cannot be processed by traditional manufacturing methods. The printing time for the entire hydraulic split valve is 5 days, and the manufacturing cycle is significantly reduced compared with the precision casting process, solving the technical problems such as difficult machining, long manufacturing cycle, and high cost of the hydraulic split valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The specification drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0021] Figure 1 Shows the flowchart of the manufacturing design method for the hydraulic split valve for drilling tools of the present invention;

[0022] Figure 2 Shows the front view of the hydraulic split valve of the present invention;

[0023] Figure 3 Shows Figure 2 the top view of

[0024] Figure 4 Shows Figure 3 a partial cross - sectional view of

[0025] Figure 5 Shows the position schematic diagram of the added process support model.

[0026] Among them, the above - mentioned drawings include the following reference numerals:

[0027] 10. Sleeve structure; 11. Extended section; 20. Conical structure; 30. Cylinder; 40. Process support model; 51. Top peripheral side surface; 52. Middle peripheral side surface; 53. Bottom peripheral side surface. Detailed implementation manners

[0028] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0029] It should be pointed out that, unless otherwise specified, all technical and scientific terms used in the present application have the same meanings as those commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0030] In the present invention, unless otherwise stated, the orientation words such as "upper, lower, top, bottom" usually refer to the directions shown in the drawings, or refer to the vertical, perpendicular or gravitational directions of the components themselves; similarly, for the convenience of understanding and description, "inner, outer" refer to the inner and outer of the contours of the respective components, but the above orientation words are not used to limit the present invention.

[0031] In order to solve the problem that the traditional casting method of the hydraulic split valve for the automatic drilling tool in the prior art cannot meet its accuracy requirements, the present invention provides a manufacturing design method for the hydraulic split valve for the drilling tool.

[0032] Such as Figure 1A manufacturing design method for a hydraulic split valve for a drilling tool, comprising: Step S1: Determine the liquid inlet and outlet positions, heights, and minimum channel thicknesses of the hydraulic split valve according to the maximum working pressure, maximum flow rate, number of channels, and installation position of the hydraulic split valve; Step S2: Based on the laser selective melting process, determine the channel size morphology and minimum channel wall thickness of the hydraulic split valve to obtain a three-dimensional model of the hydraulic split valve; Step S3: Based on the laser selective melting additive manufacturing process, add a process support model and increase the secondary machining allowance to obtain a printing model of the hydraulic split valve; Step S4: Select the substrate material and powder material for printing, select the printing sequence, printing direction, and coordinate system of the hydraulic split valve, and use layer software to determine the printing path and program; Step S5: Use the laser selective melting process to simultaneously perform additive printing of the hydraulic split valve and test specimens; Step S6: After printing, perform powder cleaning, remove non-conformal supports during the powder cleaning stage, and perform radiographic inspection on the inside of the channels to determine whether the powder has been completely removed; Step S7: The hydraulic split valve and test specimens are annealed together as a whole; Step S8: Remove the substrate by wire cutting; Step S9: Through post-processing including wire cutting, remove the part support structure, polish the part support surface, and use vibration post-processing to remove metal particles inside the channels; Step S10: Perform X-ray inspection on the parts to detect the internal quality of the parts, and perform fluorescent penetrant inspection on the parts to detect the surface quality of the parts; Step S11: Use a three-dimensional scanning instrument to detect the external dimensions of the parts, determine the assembly tolerance, analyze the machining allowance of the mating surface, and compare and analyze the printing model of the hydraulic split valve to determine the effectiveness of printing; Step S12: Secondary machining; Step S13: Surface nitriding.

[0033] Through the above process steps in this embodiment, during the overall optimization design of the manufactured hydraulic split valve, the mass of the hydraulic split valve is reduced, enabling the manufactured hydraulic split valve to meet the accuracy requirements. Moreover, the entire manufacturing process is relatively simple. Compared with the traditional precision casting method, the method in this embodiment results in a lower manufacturing cost for the hydraulic split valve, effectively eliminating internal defects and achieving a higher yield. The method in this embodiment utilizes the laser selective melting technology. By discretizing the part model along a certain direction into a series of ordered micron-scale thin layers, using the laser as the heat source to melt the metal powder layer by layer, and directly manufacturing the part, it realizes the integrated design and manufacturing of material-structure-function. It can machine complex cavity flow channel structures that cannot be machined by traditional manufacturing methods. The entire printing time of the hydraulic split valve is 5 days, and the manufacturing cycle is significantly reduced compared with the precision casting process, solving the technical problems of difficult machining, long manufacturing cycle, and high cost of the hydraulic split valve.

[0034] As Figures 2 to 4As shown in the figure, the hydraulic split valve of this embodiment includes a sleeve structure 10 on the outside. The outside of the sleeve structure 10 is circular, and the inside is conical. The small-diameter end of the cone faces downward, and the large-diameter end faces upward. At the bottom surface of the sleeve structure 10, that is, the small-diameter end extends downward for a certain distance to form an extended section 11, and the extended section 11 extends beyond the circumferential outer surface range of the sleeve structure 10. At the upper axis of the sleeve structure 10, a conical structure 20 is provided. The tip of the conical structure 20 faces downward, and the inclined surface is substantially parallel to the inner wall surface of the sleeve structure 10. Three columns 30 are arranged between the circumferential inclined surface of the conical structure 20 and the conical inner wall surface of the sleeve structure 10. The three columns 30 are inclined and circumferentially evenly distributed, thereby connecting the sleeve structure 10 and the conical structure 20. Channels that communicate with each other are opened in the conical structure 20, inside the columns 30, and inside the sleeve structure 10. The top opening of the channel is located at the top of the conical structure 20, and the bottom opening is located at the bottom surface of the sleeve structure 10. The number of channels can be set to three, and one is respectively corresponding to each column 30, and the three are not connected to each other.

[0035] In this embodiment, the manufacturing design method of the hydraulic split valve for drilling tools further includes: in step S1, the maximum working pressure of the hydraulic split valve is 15 MPa, the maximum flow rate is 3.5 L / s, the number of channels is 3, determine the installation position of the hydraulic split valve, determine the liquid inlet and outlet positions, height and the channel diameter is 10 mm, and the minimum wall thickness is not less than 5 mm.

[0036] In this embodiment, the manufacturing design method of the hydraulic split valve for drilling tools further includes: in step S2, through optimization calculation, with the optimization goals of reducing pressure drop and self-weight, determine that the channels of the hydraulic split valve are of a gradually changing elliptical shape, the minimum wall thickness of the channels is 3.5 mm, and obtain the three-dimensional structure design model of the hydraulic split valve. Since the channels adopt an elliptical structure, the generation of liquid flow vortices in the channels is avoided, and the pressure loss is small.

[0037] In this embodiment, the manufacturing design method of the hydraulic split valve for drilling tools further includes: in step S3, add a process support model 40 at the central axis and the bottom surface of the hydraulic split valve, and add a secondary machining allowance to the circumferential side surface of the hydraulic split valve. The secondary machining allowance is greater than or equal to 2.5 mm to form the printing model of the hydraulic split valve, as Figure 2 and Figure 5As shown in the figure. For the process support model 40, the top end of the model at the central axis is connected to the tip of the conical structure 20, and the bottom end is connected to the model on the bottom surface. For the secondary machining allowance, the circumferential side surface of the hydraulic split valve mentioned here includes three parts: the top circumferential side surface 51 at the top of the hydraulic split valve, the relatively large middle circumferential side surface 52 in the middle, and the bottom circumferential side surface 53 at the bottom end, that is, the non-inclined circumferential side surface of the conical structure 20, the circumferential outer side surface of the sleeve structure 10, and the circumferential side surface of the extended section 11.

[0038] In this embodiment, the manufacturing design method for the hydraulic split valve for drilling tools further includes: in step S4, the selected substrate material is a stainless steel substrate, the size matches the size of the selective laser melting equipment, the thickness is 30 - 50 mm, the flatness is not greater than 0.05, and the selected powder material is: 17 - 4PH, the powder particle size is 10 - 45 μm; C: ≤0.07%; Si: ≤0.07%; Mn: ≤1.0%; P ≤0.04%; S ≤0.015%; Nb + Ta: 0.15 - 0.5%; Ni: 3 - 5%; Mo: ≤0.5%; Cr: 15 - 17.5%; Cu: 3 - 5%; N: ≤0.1%.

[0039] In this embodiment, the manufacturing design method for the hydraulic split valve for drilling tools further includes: in step S4, when selecting the printing direction and sequence of the hydraulic split valve, first print the bottom contour from bottom to top, then print the middle transition area and the channels, and finally print the valve seat.

[0040] In this embodiment, the manufacturing design method for the hydraulic split valve for drilling tools further includes: in step S5, the parameters of the selective laser melting process are: the laser power is 400 - 500 W, the scanning speed is 600 - 800 mm / s, the spot diameter is 0.1 mm, and the printing thickness of each layer is 0.04 mm. The test specimens are tensile and impact specimens.

[0041] In this embodiment, the manufacturing design method for the hydraulic split valve for drilling tools further includes: in step S6, the powder cleaning process is mechanical vibration powder cleaning.

[0042] In this embodiment, the manufacturing design method for the hydraulic split valve for drilling tools further includes: in step S7, the overall annealing process is 600 - 625 °C, and the holding time is two hours.

[0043] In this embodiment, the manufacturing design method for the hydraulic split valve for drilling tools further includes: in step S8, when removing the substrate by wire cutting, the cutting height is at least 2 mm above the substrate.

[0044] In this embodiment, the manufacturing design method of the hydraulic split valve for drilling tools further includes: in step S9, through manual post-processing, knocking out the part support structure, grinding the part support surface, and removing the metal particles inside the hole channel on the vibration table.

[0045] In this embodiment, the manufacturing design method of the hydraulic split valve for drilling tools further includes: in step S10, when performing X-ray detection, cracks and lack of fusion defects are not allowed. If cracks and lack of fusion defects appear, the part is unqualified inside. The maximum allowable pore size is 1 mm and the number is 4. When performing fluorescent penetrant testing, the surface defects of the part are ground and removed.

[0046] In this embodiment, the manufacturing design method of the hydraulic split valve for drilling tools further includes: in step S11, by detecting the maximum difference between the external dimension and the printed dimension of the part, the assembly tolerance is determined, and the machining allowance of the mating surface is analyzed.

[0047] In this embodiment, the manufacturing design method of the hydraulic split valve for drilling tools further includes: in step S13, carburizing treatment is performed on the additively printed hydraulic split valve, the carburized layer depth is 1.0 - 1.5 mm, and the surface hardness is 58 - 63 HRC.

[0048] It should be noted that the above specific parameters can be adjusted accordingly according to needs, and are not limited to the specific values of this embodiment.

[0049] It should be noted that the multiple in the above embodiments refers to at least two.

[0050] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0051] 1. Solved the problem that the traditional casting method of the hydraulic split valve for automatic drilling tools in the prior art cannot meet its accuracy requirements;

[0052] 2. During the overall optimization design process of the manufactured hydraulic split valve, the mass of the hydraulic split valve is reduced, so that the manufactured hydraulic split valve can meet the accuracy requirements;

[0053] 3. The entire manufacturing process is relatively simple, making the manufacturing cost of the hydraulic split valve lower, the internal defects can be effectively eliminated, and the yield rate is higher;

[0054] 4. Realized the integrated design and manufacturing of material - structure - function, and can machine complex cavity flow channel structures that cannot be machined by traditional manufacturing methods;

[0055] 5. The printing time of the entire hydraulic split valve is 5 days, and the manufacturing cycle is significantly reduced compared with the precision casting process;

[0056] 6. Since the pore channels adopt an elliptical structure, the generation of vortices in the liquid flow in the pore channels is avoided, and the pressure loss is small.

[0057] Obviously, the embodiments described above are only a part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0058] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless otherwise clearly specified in the context, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0059] It should be noted that the terms "first", "second", etc. in the description, claims and drawings of the present application are used to distinguish similar objects and do not necessarily have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0060] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A manufacturing design method for a hydraulic split valve for a drilling tool, characterized in that, Including: Step S1: Determine the liquid inlet and outlet positions, heights, and minimum channel thicknesses of the hydraulic split valve according to the maximum working pressure, maximum flow rate, number of channels, and installation position of the hydraulic split valve; Step S2: Based on the selective laser melting process, determine the channel size morphology and minimum channel wall thickness of the hydraulic split valve to obtain a three-dimensional model of the hydraulic split valve; Step S3: Based on the selective laser melting additive manufacturing process, add a process support model and increase the secondary machining allowance to obtain a printed model of the hydraulic split valve; Step S4: Select the substrate material and powder material for printing, select the printing sequence, printing direction, and coordinate system of the hydraulic split valve, and use layer software to determine the printing path and program; Step S5: Use the selective laser melting process to simultaneously perform additive printing of the hydraulic split valve and test specimens; Step S6: After printing, perform powder cleaning, remove non-conformal supports during the powder cleaning stage, and perform radiographic inspection on the inside of the channels to determine whether the powder is completely removed; Step S7: Perform overall annealing on the hydraulic split valve and the test specimens together; Step S8: Remove the substrate by wire cutting; Step S9: Through post-processing including wire cutting, remove the part support structure, polish the part support surface, and use vibratory post-processing to remove metal particles inside the channels; Step S10: Perform X-ray inspection on the part to detect the internal quality of the part, and perform fluorescent penetrant inspection on the part to detect the surface quality of the part; Step S11: Use a three-dimensional scanning instrument to detect the external dimensions of the part, determine the assembly tolerance, analyze the machining allowance of the mating surface, and compare and analyze the printed model of the hydraulic split valve to determine the effectiveness of printing; Step S12: Secondary machining; Step S13: Surface nitriding.

2. The manufacturing design method of the hydraulic split valve for the drilling tool according to claim 1, characterized in that, The manufacturing design method of the hydraulic split valve for the drilling tool further includes: In the step S1, the maximum working pressure of the hydraulic split valve is 15 MPa, the maximum flow rate is 3.5 L / s, the number of channels is 3, determine the installation position of the hydraulic split valve to determine the liquid inlet and outlet positions, heights, the channel diameter is 10 mm, and the minimum wall thickness is not less than 5 mm.

3. The manufacturing design method of the hydraulic split valve for drilling tools according to claim 1, characterized in that, The manufacturing design method of the hydraulic split valve for the drilling tool further includes: In the step S2, through optimization calculation, determine that the channels of the hydraulic split valve are of a gradually changing elliptical shape, the minimum channel wall thickness is 3.5 mm, and obtain a three-dimensional structural design model of the hydraulic split valve.

4. The manufacturing design method of the hydraulic split valve for drilling tools according to claim 1, characterized in that, The manufacturing design method of the hydraulic split valve for the drilling tool further includes: In the step S3, add a process support model at the central axis and bottom surface of the hydraulic split valve, add a secondary machining allowance to the circumferential side surface of the hydraulic split valve, and the secondary machining allowance is greater than or equal to 2.5 mm to form a printed model of the hydraulic split valve.

5. The manufacturing design method of the hydraulic split valve for the drilling tool according to claim 1, characterized in that, The manufacturing design method of the hydraulic split valve for the drilling tool further includes: In the step S4, the selected substrate material is a stainless steel substrate, with its size matching the size of the selective laser melting equipment, a thickness of 30 - 50 mm, a flatness not greater than 0.05, and the selected powder material is 17 - 4PH, with a powder particle size of 10 - 45 μm; C: ≤0.07%; Si: ≤0.07%; Mn: ≤1.0%; P ≤0.04%; S ≤0.015%; Nb + Ta: 0.15 - 0.5%; Ni: 3 - 5%; Mo: ≤0.5%; Cr: 15 - 17.5%; Cu: 3 - 5%; N: ≤0.1%.

6. The manufacturing design method of the hydraulic split valve for the drilling tool according to claim 1, characterized in that, The manufacturing design method of the hydraulic split valve for the drilling tool further includes: In the step S4, when selecting the printing direction and sequence of the hydraulic split valve, first print the bottom contour from bottom to top, then print the middle transition area and the channels, and finally print the valve seat.

7. The manufacturing design method of the hydraulic split valve for drilling tools according to claim 1, characterized in that, The manufacturing design method of the hydraulic split valve for the drilling tool further includes: In the step S5, the parameters of the selective laser melting process are: a laser power of 400 - 500 W, a scanning speed of 600 - 800 mm / s, a spot diameter of 0.1 mm, and a printing thickness of 0.04 mm for each layer.

8. The manufacturing design method of the hydraulic split valve for the drilling tool according to claim 1, characterized in that, The manufacturing design method of the hydraulic split valve for the drilling tool further includes: In the step S6, the powder cleaning process is mechanical vibration powder cleaning.

9. The manufacturing design method of the hydraulic split valve for drilling tools according to claim 1, characterized in that, The manufacturing design method of the hydraulic split valve for the drilling tool further includes: In the step S7, the overall annealing process is at 600 - 625 °C for two hours of heat preservation.

10. The manufacturing design method of the hydraulic split valve for drilling tools according to claim 1, characterized in that, The manufacturing design method of the hydraulic split valve for the drilling tool further includes: In the step S8, when removing the substrate by wire cutting, the cutting height is at least 2 mm above the substrate.

11. The manufacturing design method of the hydraulic split valve for drilling tools according to claim 1, characterized in that, The manufacturing design method of the hydraulic split valve for the drilling tool further includes: In the step S9, through manual post - processing, knock out the part support structure, polish the part support surface, and remove the metal particles inside the channels on a vibrating table.

12. The manufacturing design method of the hydraulic split valve for drilling tools according to claim 1, characterized in that, The manufacturing design method of the hydraulic split valve for the drilling tool further includes: In the step S10, when performing the X - ray detection, if cracks and lack - of - fusion defects appear, the part is unqualified inside. The maximum allowable pore size is 1 mm and the number is 4. When performing the fluorescent penetrant inspection, the surface defects of the part are polished and removed.

13. The manufacturing design method of the hydraulic split valve for drilling tools according to claim 1, characterized in that, The manufacturing design method of the hydraulic split valve for the drilling tool further includes: In the step S11, determine the assembly tolerance by detecting the maximum difference between the external dimensions and the printed dimensions of the part, and analyze the machining allowance of the mating surface.

14. The manufacturing design method of the hydraulic split valve for the drilling tool according to claim 1, wherein, The manufacturing design method of the hydraulic split valve for the drilling tool further includes: In the step S13, perform carburizing treatment on the additively printed hydraulic split valve, with a carburized layer depth of 1.0 - 1.5 mm and a surface hardness of 58 - 63 HRC.

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