Method and device for boring long-hanging-depth multi-hole bearing hole

Abstract

The invention discloses a boring method and device for a long-hanging-depth multi-hole-system bearing hole. The boring method comprises the following steps that S100, a first bearing hole and a second bearing hole are drilled in a gearbox, wherein the first bearing hole and the second bearing hole are formed in the extending direction of a preset axis at intervals; s200, the rotating shaft provided with the boring tool is arranged in the first bearing hole in a penetrating mode from the side, away from the second bearing hole, of the first bearing hole; the rotating shaft is positioned in the first bearing hole through a supporting tool, so that the rotating shaft and the first bearing hole are coaxial; and S300, boring operation is conducted on the second bearing hole through a boring tool. According to the design of the boring method and device, the stability of the rotating shaft in the operation process can be improved, the shaking degree in the operation process is reduced, the boring precision is improved, the concentricity of a plurality of bearing holes is guaranteed, and therefore the assembly quality is improved.

Description

Technical Field

[0001] The invention relates to the field of mechanical processing technology, in particular to a method and device for boring a long-overhang deep multi-hole bearing hole. Background Art

[0002] The housing of a large multi-axis gearbox has a large size and multiple axis systems, and the spacing between the two bearing holes arranged on the same axis is large. When the equipment spindle and boring tool are used to process the bearing holes, the spindle and boring tool are overhanging too long, resulting in severe drooping due to gravity and large shaking and instability caused by rotation. The concentricity requirements of the two bearing holes arranged at intervals cannot be guaranteed, so that the actual processing accuracy does not meet the product requirements.

[0003] The inventors found in their research that the prior art method for processing long overhang deep multi-hole bearing holes has at least the following disadvantages:

[0004] Due to the large spacing between the two bearing holes, in order to bore the bearing hole at a farther position, a longer spindle or boring bar is required. One end of the spindle or boring bar is connected to the motor, and the other end is suspended in the air. The boring tool is located at the suspended end. As a result, during the boring process, the spindle or boring bar has poor stability, large deflection and shaking, poor boring quality, and cannot guarantee the coaxiality of the two bearing holes. Summary of the invention

[0005] The objects of the present invention include, for example, providing a method and device for boring long-overhang deep multi-hole bearing holes, which can improve the boring accuracy, improve the coaxiality of multiple bearing holes arranged on the same axis, and improve the assembly quality of the gearbox.

[0006] The embodiments of the present invention can be implemented as follows:

[0007] In a first aspect, the present invention provides a method for boring a bearing hole with a long overhang and a deep multi-hole system, comprising the following steps:

[0008] Step S100: drilling a first bearing hole and a second bearing hole arranged at intervals in the extension direction of a preset axis on the gear box;

[0009] Step S200: inserting a rotating shaft equipped with a boring tool into the first bearing hole from a side of the first bearing hole away from the second bearing hole; positioning the rotating shaft in the first bearing hole by using a supporting tool, so that the rotating shaft is coaxial with the first bearing hole;

[0010] Step S300: using the boring tool to perform a boring operation on the second bearing hole.

[0011] In an alternative embodiment, in step S200, the dimension of the support tooling in the radial direction of the rotating shaft is adjusted so that the distance between the outer peripheral surface of the rotating shaft and the hole wall of the first bearing hole is equal everywhere.

[0012] In a second aspect, the present invention provides a boring device for long overhang deep multi-hole series bearing holes, which is applied to the boring method for long overhang deep multi-hole series bearing holes described in the foregoing embodiment. The device includes:

[0013] A boring mechanism and a support tooling;

[0014] The boring mechanism includes a driving motor, a rotating shaft, and a boring tool. The output shaft of the driving motor is fixedly connected to the rotating shaft, and the rotating shaft is fixedly connected to the boring tool;

[0015] The support tooling is connected to the rotating shaft and is used to be installed in the first bearing hole to adjust the relative position between the rotating shaft and the first bearing hole.

[0016] In an alternative embodiment, the support tooling includes a plurality of support units, and the plurality of support units are independently designed and are all arranged around the rotating shaft.

[0017] In an alternative embodiment, the support unit includes an inner support plate, an outer support plate, and an adjusting rod. The inner support plate has an inner arc surface, and the inner arc surface contacts the outer peripheral surface of the rotating shaft; the outer support plate has an outer arc surface, and the outer arc surface contacts the hole wall of the first bearing hole; the adjusting rod is connected to both the inner support plate and the outer support plate at the same time and is used to adjust the distance between the inner support plate and the outer support plate.

[0018] In an alternative embodiment, the axis of the cylinder where the inner arc surface is located is collinear with the axis of the cylinder where the outer arc surface is located; the extension line of the adjusting rod is perpendicular to and intersects the axis of the cylinder where the inner arc surface is located.

[0019] In an alternative embodiment, a powder storage groove is provided on the inner arc surface.

[0020] In an alternative embodiment, both ends of the powder storage groove in its extending direction have a distance from the four peripheral edges of the inner arc surface.

[0021] In an alternative embodiment, at least one bending section is provided on the powder storage groove in its extending direction.

[0022] In an alternative embodiment, the adjusting rod includes a first rod body, a second rod body, and an adjusting sleeve. One end of the first rod body is fixed to the inner support plate, one end of the second rod body is fixed to the inner support plate, and the adjusting sleeve is screwed to both the first rod body and the second rod body; when the adjusting sleeve rotates, the first rod body and the second rod body move closer to or away from each other.

[0023] The beneficial effects of the embodiments of the present invention include, for example:

[0024] In summary, for the long overhang deep multi-hole series bearing hole boring method provided in this embodiment, when boring the second bearing hole far from the first bearing hole, the rotating shaft is passed through the first bearing hole, and then the rotating shaft is positioned in the first bearing hole by using the supporting tooling, so that the rotating shaft is coaxially designed with the first bearing hole. At the same time, since the end of the rotating shaft is supported by the motor, and the motor and the supporting tooling cooperate, the rotating shaft changes from the original cantilever structure to a two-point simply supported structure, improving the stability of the rotating shaft, reducing the deflection of the rotating shaft, and making it difficult for the boring tool to sag. When the motor drives the rotating shaft and the boring tool to rotate together, the rotating shaft is not easy to shake, the boring accuracy is high, the boring quality is high, and the concentricity between the second bearing hole and the first bearing hole after fine boring can be ensured, thereby improving the assembly quality of the gearbox. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 It is a schematic application diagram of the long overhang deep multi-hole series bearing hole boring device of this embodiment;

[0027] Figure 2 It is a schematic application diagram of the supporting tooling of this embodiment;

[0028] Figure 3 It is a schematic application diagram of the inner support plate of this embodiment;

[0029] Figure 4 It is a schematic application diagram of the adjusting rod of this embodiment.

[0030] ICON:

[0031] 001 - Gearbox; 011 - First bearing hole; 012 - Second bearing hole; 100 - Rotating shaft; 200 - Boring tool; 300 - Supporting tooling; 310 - Supporting unit; 311 - Inner support plate; 3111 - Inner arc surface; 3112 - Powder storage groove; 312 - Outer support plate; 3121 - Outer arc surface; 313 - Adjusting rod; 3131 - First rod body; 3132 - Second rod body; 3133 - Adjusting sleeve. Detailed implementation mode

[0032] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. The components of the embodiments of the present invention usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0034] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0035] In the description of the present invention, it should be noted that if terms such as "upper", "lower", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present invention.

[0036] In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0037] It should be noted that the features in the embodiments of the present invention can be combined with each other without conflict.

[0038] In the prior art, the boring tool 200 is installed on the rotating shaft 100. When machining a bearing hole with a long overhang depth, a relatively long rotating shaft 100 is required. The rotating shaft 100 is only supported and positioned on one side by the motor, and the rotating shaft 100 is of a cantilever structure. The stability of the rotating shaft 100 is poor, the deflection is large, and the boring tool 200 installed at the distal end of the rotating shaft 100 is prone to the phenomenon of drooping. During boring, the rotating shaft 100 shakes greatly, and the boring tool 200 shakes greatly, so that the concentricity of multiple bearing holes cannot be guaranteed, the machining accuracy of the bearing holes is low, and the machining quality of the gearbox 001 is poor.

[0039] In view of this, the designer provides a boring method for a long overhang depth multi-hole series bearing hole, which can improve the stability of the rotating shaft 100, reduce the shaking degree during operation, improve the boring accuracy, ensure the concentricity of multiple bearing holes, and thus improve the assembly quality.

[0040] Please refer to Figure 1 , this embodiment provides a boring method for a long overhang depth multi-hole series bearing hole, including the following steps:

[0041] Step S100: Drill a first bearing hole 011 and a second bearing hole 012 which are arranged at intervals in the extending direction of the preset axis on the gearbox 001;

[0042] Step S200: Pass the rotating shaft 100 installed with the boring tool 200 into the first bearing hole 011 from the side of the first bearing hole 011 far away from the second bearing hole 012; position the rotating shaft 100 in the first bearing hole 011 by using the support tooling 300 to make the rotating shaft 100 coaxial with the first bearing hole 011;

[0043] Step S300: Use the boring tool 200 to perform boring operation on the second bearing hole 012.

[0044] As described above, the boring method for a long overhang depth multi-hole series bearing hole provided by this embodiment has at least the following advantages:

[0045] When boring the second bearing hole 012 away from the first bearing hole 011, the rotating shaft 100 is passed through the first bearing hole 011. Then, the rotating shaft 100 is positioned in the first bearing hole 011 by using the supporting tooling 300, so that the rotating shaft 100 is coaxially designed with the first bearing hole 011. At the same time, since the end of the rotating shaft 100 is supported by the motor, and the motor and the supporting tooling 300 cooperate, the rotating shaft 100 changes from the original cantilever structure to a two-point simply supported structure, improving the stability of the rotating shaft 100, reducing the deflection of the rotating shaft 100, and making it difficult for the boring tool 200 to sag. When the motor drives the rotating shaft 100 and the boring tool 200 to rotate together, the rotating shaft 100 is not easy to shake, the boring accuracy is high, and the boring quality is high, which can ensure the concentricity between the second bearing hole 012 and the first bearing hole 011 after fine boring, thereby improving the assembly quality of the gearbox 001.

[0046] It should be noted that the boring method provided in this embodiment can be applied not only to the machining of two bearing holes arranged along a preset axis, but also to the machining scenarios of three or more bearing holes.

[0047] The following embodiments will illustrate the details of the boring method for long overhang deep multi-hole series bearing holes of the present application by way of examples.

[0048] In step S100, the gearbox 001 can be first positioned on the drilling machine, and the first bearing hole 011 and the second bearing hole 012 are drilled on the gearbox 001 along the preset axis by using a drill bit. Then, the gearbox 001 is moved to the boring machine. First, the fine boring of the first bearing hole 011 is carried out by using the boring tool 200 of the short shaft. Since the first bearing hole 011 is located on the side close to the boring tool 200 and the distance between them is small, the short shaft can be used to drive the boring tool 200 to rotate for fine boring. The short shaft has a small size, a small deflection, high stability, and high boring accuracy. When the boring of the first bearing hole 011 is completed, the hole wall of the first bearing hole 011 can be used as the supporting surface for positioning the rotating shaft 100. The length of the rotating shaft 100 is greater than the length of the short shaft. In other words, after the boring of the first bearing hole 011, the short shaft can be removed from the motor, and the longer rotating shaft 100 is replaced, and the boring tool 200 on the rotating shaft 100 is used to carry out the boring operation on the distal second bearing hole 012.

[0049] In step S200, after the rotating shaft 100 passes through the first bearing hole 011, the boring tool 200 is inserted into the second bearing hole 012. Before boring the second bearing hole 012 with the boring tool 200, the position of the rotating shaft 100 is adjusted by using the supporting tooling 300 to make the rotating shaft 100 coaxial with the first bearing hole 011, and the rotating shaft 100 is supported and positioned by the supporting tooling 300 to improve the stability of the rotating shaft 100. In other words, the rotating shaft 100 is a cylindrical shaft, the outer diameter of the rotating shaft 100 is smaller than the diameters of the first bearing hole 011 and the second bearing hole 012. After the rotating shaft 100 is inserted into the first bearing hole 011, there is a gap between the outer peripheral surface of the rotating shaft 100 and the hole wall of the first bearing hole 011. Since the rotating shaft 100 is only supported at one end by the motor, the deflection of the rotating shaft 100 is large and the stability is poor, and the rotating shaft 100 shakes relative to the first bearing hole 011. At this time, the supporting tooling 300 is installed in the first bearing hole 011, and the space between the rotating shaft 100 and the hole wall of the first bearing hole 011 is filled by using the supporting tooling 300. Thus, under the combined action of the hole wall of the first bearing hole 011 and the supporting tooling 300, a fulcrum is provided for the rotating shaft 100 to stabilize the position of the rotating shaft 100 and ensure that the rotating shaft 100 is coaxial with the first bearing hole 011. Since the position of the rotating shaft 100 is stable, the boring tool 200 is not easy to sag, and during boring, the boring tool 200 is not easy to shake. After boring, the axis of the second bearing hole 012 basically coincides with the axis of the rotating shaft 100, and further ensures that the axis of the second bearing hole 012 basically coincides with the axis of the first bearing hole 011, improving the concentricity and the machining quality, and the assembly quality of the gearbox 001 is high.

[0050] At the same time, since the hole wall of the first bearing hole 011 inside the gearbox 001 is directly used to provide the supporting position, there is no need to additionally set up a structure for installing the supporting tooling 300, which simplifies the structure, saves space and reduces costs. At the same time, since no new structure is added, the cumulative error can be reduced, and thus the machining accuracy is improved.

[0051] In step S300, after the position of the rotating shaft 100 is adjusted, the motor is started, and the motor drives the rotating shaft 100 to rotate, thereby driving the boring tool 200 to rotate, and the second bearing hole 012 is finish-bored by using the boring tool 200. During the rotation of the rotating shaft 100, it is supported and positioned by the supporting tooling 300 and is not easy to shake, and the boring tool 200 is not easy to shake, and the boring accuracy is high. It should be understood that after the supporting tooling 300 is installed in the first bearing hole 011, it is relatively fixed to the hole wall of the first bearing hole 011, and the rotating shaft 100 can rotate relative to the supporting tooling 300.

[0052] The boring method for the long overhang deep multi-hole bearing holes provided in this embodiment, when using a relatively long rotating shaft 100 to drive a boring tool 200 to perform boring operations on the second bearing hole 012, the rotating shaft 100 is supported and positioned by a support tooling 300, with high stability, not prone to shaking, high boring accuracy, and improving the concentricity between the first bearing hole 011 and the second bearing hole 012.

[0053] Please refer to Figures 1-4 , this embodiment also provides a boring device for long overhang deep multi-hole bearing holes, which is applied to the boring method for long overhang deep multi-hole bearing holes in the above embodiment. The device includes:

[0054] A boring mechanism and a support tooling 300;

[0055] The boring mechanism includes a driving motor (not shown in the figure), a rotating shaft 100, and a boring tool 200. The output shaft of the driving motor is fixedly connected to the rotating shaft 100, and the rotating shaft 100 is fixedly connected to the boring tool 200;

[0056] The support tooling 300 is connected to the rotating shaft 100 and is used to be installed in the first bearing hole 011 to adjust the relative position between the rotating shaft 100 and the first bearing hole 011.

[0057] In this embodiment, optionally, the support tooling 300 includes a plurality of support units 310. The plurality of support units 310 are independently designed and are arranged around the rotating shaft 100. Through the cooperation of the plurality of support units 310, the position of the rotating shaft 100 can be adaptively adjusted around the rotating shaft 100, thereby improving the coaxiality of the rotating shaft 100 relative to the first bearing hole 011; at the same time, adjustment is convenient and flexible from multiple directions.

[0058] Optionally, the structures of the plurality of support units 310 are set to be the same, which is convenient for processing and manufacturing. In this embodiment, in order to avoid repeated and cumbersome narration, the structure of one support unit 310 is taken as an example for description.

[0059] Please refer to Figure 2, for example, the support unit 310 includes an inner support plate 311, an outer support plate 312, and an adjusting rod 313. The adjusting rod 313 is connected to both the inner support plate 311 and the outer support plate 312, and can adjust the distance between the inner support plate 311 and the outer support plate 312. Optionally, both the inner support plate 311 and the outer support plate 312 are provided as arc-shaped plates. Specifically, the inner support plate 311 has an inner arc surface 3111, and the inner arc surface 3111 contacts the outer peripheral surface of the rotating shaft 100. The outer support plate 312 has an outer arc surface 3121, and the outer arc surface 3121 contacts the hole wall of the first bearing hole 011. Moreover, the axis of the cylinder where the inner arc surface 3111 is located is collinear with the axis of the cylinder where the outer arc surface 3121 is located, and the extension line of the adjusting rod 313 perpendicularly intersects the axis of the cylinder where the inner arc surface 3111 or the outer arc surface 3121 is located. In other words, the length direction of the adjusting rod 313 extends in the radial direction of the cross-sectional circle of the cylinder where the inner arc surface 3111 or the outer arc surface 3121 is located. In this way, the adjusting rod 313 can expand and contract in the radial direction of the inner arc surface 3111 or the outer arc surface 3121, enabling the inner support plate 311 and the outer support plate 312 to move relative to each other in the radial direction, facilitating the adjustment of the distance between the inner support plate 311 and the outer support plate 312.

[0060] Please refer to Figure 3 , optionally, a powder storage groove 3112 is provided on the inner arc surface 3111. The powder storage groove 3112 can be used to store powder for reducing friction, such as graphite powder, etc. After installing the inner support plate 311 outside the rotating shaft 100, the inner arc surface 3111 contacts the rotating shaft 100, and there is graphite powder between the inner arc surface 3111 and the rotating shaft 100, reducing the friction between the inner arc surface 3111 and the rotating shaft 100. The rotating shaft 100 rotates more flexibly relative to the inner arc surface 3111, with less wear and is not easily damaged.

[0061] It should be understood that both ends of the powder storage groove 3112 in its extending direction have a spacing from the four peripheral edges of the inner arc surface 3111. That is to say, since the ends of the powder storage groove 3112 do not extend to the edge of the inner arc surface 3111, after the inner arc surface 3111 contacts the rotating shaft 100, the rotating shaft 100 shields the notch of the powder storage groove 3112, and the inner arc surface 3111 and the rotating shaft 100 cooperate to form a relatively closed chamber, and the graphite powder in the powder storage groove 3112 is not easily leaked, and the use effect is good.

[0062] In addition, when installing multiple support units 310 on the rotating shaft 100, they are installed in a sequential order, and the support units 310 are all placed into the first bearing hole 011 from the bottom of the rotating shaft 100. Specifically, when it is necessary to install the support unit 310, first make the inner arc surface 3111 of the inner support plate 311 face upward, fill graphite powder into the powder storage groove 3112, and the graphite powder can be evenly distributed in the powder storage groove 3112. Then, make the inner arc surface 3111 of the inner support plate 311 fit against the lower part of the rotating shaft 100, and then make the inner support plate 311 rotate upward along with the rotating shaft 100 until the inner support plate 311 rotates above the rotating shaft 100. During this process, the inner arc surface 3111 of the inner support plate 311 does not leave the rotating shaft 100, and the graphite powder is not likely to fall from the powder storage groove 3112, resulting in a good installation effect. When the inner support plate 311 rotates to the set position, operate the adjusting rod 313 to increase its length, so that the outer arc surface 3121 of the outer support plate 312 contacts the hole wall of the first bearing hole 011, achieving the preliminary positioning of the support unit 310. Next, when installing the next support unit 310, also make the inner arc surface 3111 of the support inner ring face upward, fill graphite powder, then make the inner arc surface 3111 fit against the lower part of the rotating shaft 100, rotate the support unit 310 along with the rotating shaft 100, and when it rotates to the set position, increase the length of the adjusting rod 313 to preliminarily position the support unit 310.

[0063] Optionally, at least one bending section is provided in the extending direction of the powder storage groove 3112. For example, the powder storage groove 3112 can be a wavy groove, a broken line groove, etc., which can increase the length of the powder storage groove 3112 in a limited space, increase the storage capacity of the graphite powder, and make the rotation of the rotating shaft 100 relative to the inner support plate 311 more flexible.

[0064] Please refer to Figure 4 , in this embodiment, optionally, the adjusting rod 313 includes a first rod body 3131, a second rod body 3132, and an adjusting sleeve 3133. One end of the first rod body 3131 is fixed to the inner support plate 311, one end of the second rod body 3132 is fixed to the inner support plate 311, and the adjusting sleeve 3133 is screwed to both the first rod body 3131 and the second rod body 3132 at the same time; when the adjusting sleeve 3133 rotates, the first rod body 3131 and the second rod body 3132 approach or move away from each other. It should be understood that the adjusting rod 313 can be installed at the middle position in the axial direction of the inner support plate 311 and the outer support plate 312, and the force is stable. In addition, the thread grooves on the first rod body 3131 and the second rod body 3132 have opposite helix directions. Correspondingly, the number of internal threaded holes in the adjusting sleeve 3133 is two, the helix directions of the two threaded holes are opposite, and the two threaded holes are respectively screwed and matched with the first rod body 3131 and the second rod body 3132.

[0065] It is set that when the adjusting sleeve 3133 rotates clockwise, the first rod body 3131 and the second rod body 3132 move away from each other, the distance between them increases, the distance between the inner support plate 311 and the outer support plate 312 increases, and the inner support plate 311 and the outer support plate 312 are stably installed between the rotating shaft 100 and the hole wall of the first bearing hole 011. On the contrary, when the adjusting sleeve 3133 rotates counterclockwise, the first rod body 3131 and the second rod body 3132 move closer to each other, the distance between them decreases, the distance between the inner support plate 311 and the outer support plate 312 decreases, which is convenient for disassembly.

[0066] When adjusting the relative position of the support unit 310, in order to improve the adjustment accuracy, scale lines are provided on the first rod body 3131 or the second rod body 3132. By adjusting the lengths of all the adjusting rods 313 to be the same through the scale lines, it can effectively ensure that the rotating shaft 100 and the first bearing hole 011 are coaxially arranged, and the adjustment is accurate and fast.

[0067] In addition, anti-slip patterns can be provided on the outside of the adjusting sleeve 3133 to facilitate the rotation of the adjusting sleeve 3133, or the adjusting sleeve 3133 can be set as an external hexagonal sleeve to facilitate operation with a wrench.

[0068] It should be understood that the number of support units 310 can be four, etc. After installation, the four support units 310 are evenly distributed around the rotating shaft 100.

[0069] The long overhang deep multi-hole series bearing hole boring device provided in this embodiment cooperates with multiple support units 310 to stably support the rotating shaft 100. The rotating shaft 100 has high stiffness, small deflection, high stability, and is not easily deformed, which can improve the boring accuracy.

[0070] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A method for boring a long overhang deep multi-hole bearing hole, characterized in that: The steps include: Step S100: drilling a first bearing hole (011) and a second bearing hole (012) on the gear box (001) that are arranged at intervals in the extension direction of a preset axis; Step S200: inserting a rotating shaft (100) equipped with a boring tool (200) into the first bearing hole (011) from a side of the first bearing hole (011) away from the second bearing hole (012); positioning the rotating shaft (100) in the first bearing hole (011) by using a supporting tool (300) so that the rotating shaft (100) is coaxial with the first bearing hole (011); Step S300: using the boring tool (200) to perform a boring operation on the second bearing hole (012).

2. The method for boring a long overhang deep multi-hole bearing hole according to claim 1, characterized in that: In the step S200, the radial dimension of the supporting fixture (300) of the rotating shaft (100) is adjusted so that the distance between the outer peripheral surface of the rotating shaft (100) and the hole wall of the first bearing hole (011) is equal everywhere.

3. A long overhang deep multi-hole bearing hole boring device, characterized in that: The method for boring a hole of a long overhang deep porous bearing system as claimed in claim 1 or 2 comprises: Boring mechanism and supporting fixture (300); The boring mechanism comprises a driving motor, a rotating shaft (100) and a boring tool (200), wherein the output shaft of the driving motor is fixedly connected to the rotating shaft (100), and the rotating shaft (100) is fixedly connected to the boring tool (200); The supporting fixture (300) is connected to the rotating shaft (100), and the supporting fixture (300) is used to be installed in the first bearing hole (011) to adjust the relative position of the rotating shaft (100) and the first bearing hole (011).

4. The long overhang deep multi-hole bearing hole boring device according to claim 3, characterized in that: The supporting tool (300) comprises a plurality of supporting units (310), wherein the plurality of supporting units (310) are independently designed and are arranged around the rotating shaft (100).

5. The long overhang deep multi-hole bearing hole boring device according to claim 4, characterized in that: The support unit (310) comprises an inner support plate (311), an outer support plate (312) and an adjustment rod (313); the inner support plate (311) has an inner arc surface (3111), and the inner arc surface (3111) contacts the outer peripheral surface of the rotating shaft (100); the outer support plate (312) has an outer arc surface (3121), and the outer arc surface (3121) contacts the hole wall of the first bearing hole (011); the adjustment rod (313) is connected to the inner support plate (311) and the outer support plate (312) at the same time, and is used to adjust the distance between the inner support plate (311) and the outer support plate (312).

6. The long overhang deep multi-hole bearing hole boring device according to claim 5, characterized in that: The axis of the cylinder where the inner curved surface (3111) is located is colinear with the axis of the cylinder where the outer curved surface (3121) is located; the extension line of the adjustment rod (313) intersects perpendicularly with the axis of the cylinder where the inner curved surface (3111) is located.

7. The long overhang deep multi-hole bearing hole boring device according to claim 5, characterized in that: The inner curved surface (3111) is provided with a powder storage groove (3112).

8. The long overhang deep multi-hole bearing hole boring device according to claim 7, characterized in that: Both ends of the powder storage groove (3112) in the extension direction thereof are spaced apart from the surrounding edges of the inner curved surface (3111).

9. The long overhang deep multi-hole bearing hole boring device according to claim 7, characterized in that: The powder storage groove (3112) is provided with at least one bending section in its extension direction.

10. The long overhang deep multi-hole bearing hole boring device according to any one of claims 5 to 9, characterized in that: The adjusting rod (313) comprises a first rod body (3131), a second rod body (3132) and an adjusting sleeve (3133); one end of the first rod body (3131) is fixed to the inner support plate (311); one end of the second rod body (3132) is fixed to the inner support plate (311); and the adjusting sleeve (3133) is screwed to both the first rod body (3131) and the second rod body (3132); when the adjusting sleeve (3133) rotates, the first rod body (3131) and the second rod body (3132) move closer to or farther away from each other.

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