Supporting and positioning type floating cutter and workpiece center shaft hole machining method based on supporting and positioning type floating cutter

Abstract

The invention discloses a supporting and positioning type floating cutter and a workpiece center shaft hole machining method based on the supporting and positioning type floating cutter. The supporting and positioning type floating cutter comprises a guiding type cutting execution structure and a cutter connecting structure. The guiding type cutting execution structure comprises a guiding section, a middle section, a floating section, positioning supporting edges and a first cutting part, one end of the middle section is connected with the guiding section, the other end of the middle section is connected with the floating section, the guiding section protrudes outwards to form the positioning supporting edges, and the outer walls of all the positioning supporting edges surround to form a positioning wall which is located on the outer wall of a cylinder. The positioning wall is used for being tightly attached to the inner wall of a first axis hole of a machined part, and a first cutting part protrudes out of the middle section. According to the supporting and positioning type floating tool and the workpiece center shaft hole machining method based on the supporting and positioning type floating tool, the problem that in the prior art, due to the fact that the face a or the face b needs to be switched upwards in the machining process of the first axis hole and the second axis hole, the axis line of the first axis hole and the axis line of the second axis hole are not in the same straight line is solved.

Description

Technical Field

[0001] The invention relates to a floating tool, in particular to a supported and positioned floating tool and a method for machining a central axis hole of a workpiece based on the floating tool. Background Art

[0002] like Figure 1 As shown, the workpiece includes: a workpiece body, a surface 13 of the workpiece body is formed to form a first axial hole 11, a surface 14 of the workpiece body is formed to form a second axial hole 12, the first axial hole 11 is connected to the second axial hole 12, the axis line of the first axial hole 11 and the axis line of the second axial hole 12 are required to be on a straight line, the diameter of the first axial hole 11 is greater than the diameter of the second axial hole 12, the a surface 13 is parallel to the b surface 14, and the a surface and the b surface are opposite surfaces. In order to realize the first axial hole 11 and the second axial hole 12 in the workpiece, a workpiece center axis hole processing method is required.

[0003] In the prior art, the method for processing the center axis hole of a workpiece includes the following steps: processing the first axis hole and the second axis hole twice separately, that is, processing the first axis hole on the a surface once, and processing the second axis hole on the b surface another time. When processing in the above steps, it should be noted that when processing the first axis hole on the a surface, the a surface faces upward, and when processing the second axis hole on the b surface, the b surface faces upward. Therefore, it is necessary to switch between the a surface facing upward or the b surface facing upward in this process. After switching, since the tool needs to be aligned with the workpiece body twice, it is difficult for the axis line of the first axis hole and the axis line of the second axis hole to be in a straight line, resulting in low quality of the processed parts, or even failure to meet quality requirements. Summary of the invention

[0004] The present invention aims to provide a supporting and positioning floating tool and a method for processing the center axis hole of a workpiece based thereon, so as to solve the problem in the prior art that the axis line of the first axis hole and the second axis hole are not in a straight line due to the need to switch the a side facing up or the b side facing up during the processing of the first axis hole and the second axis hole.

[0005] To achieve the above object, the present invention adopts the following technical solutions: The present invention firstly discloses a supported and positioned floating tool, comprising: a guided cutting execution structure and a tool connection structure; the guided cutting execution structure comprises: a guide section, an intermediate section, a floating section, a positioning support edge and a first cutting portion, one end of the intermediate section is connected to the guide section, and the other end of the intermediate section is connected to the floating section, the guide section protrudes outward to form a positioning support edge, and the outer walls of all the positioning support edges are surrounded to form a positioning wall, the positioning wall is on the outer wall of a cylinder, the positioning wall is used to be in close contact with the inner wall of the first axial hole of the workpiece, a first cutting portion protrudes from the intermediate section, and the first cutting portion is used to cut the inner wall or outer wall of the second axial hole in the workpiece; the tool connection structure comprises: a floating shell and a tool handle, the floating shell forms a floating space, the floating space is for the floating section to extend into, the floating space is for the floating section to float in the radial direction, and the tool handle is installed on the end of the floating shell away from the intermediate section.

[0006] Preferably, the end face of the guide section facing away from the middle section is a tip end face, and the tip end face is connected to the positioning wall of the positioning support edge through an arc guide surface.

[0007] Preferably, the floating space includes: a cylindrical section and a frustum section, the cylindrical section is located at one end of the frustum section away from the first cutting portion, the cylindrical section is connected to the small section of the frustum section, and the large end of the frustum section extends toward the direction of the first cutting portion.

[0008] Preferably, a second cutting portion is formed between two adjacent positioning support edges, and the second cutting portion is located at the connection between the positioning support edge and the tip end face; an axial positioning structure is installed on the floating shell, and the axial positioning structure can move on the axial line of the tool handle. The axial positioning structure is used to limit the floating of the floating section and the first cutting portion by acting beside the first cutting portion.

[0009] Preferably, the axial positioning structure includes: an electromagnet, a permanent magnet and a positioning sleeve. The electromagnet is fixed in a floating shell. The positioning sleeve is installed in the electromagnet. The positioning sleeve can move on the axial line of the tool handle relative to the floating shell. A permanent magnet is fixed on the positioning sleeve. A reset spring is installed between the inner wall of the floating shell and the positioning sleeve. The reset spring is used to keep the positioning sleeve retracted into the floating shell. The electromagnet is used to put the positioning sleeve on the outside of the positioning annular wall next to the first cutting part after power is turned on. The positioning annular wall is formed by the outer wall of the middle section. The positioning annular wall is located on the side of the first cutting part close to the floating space.

[0010] Preferably, the positioning sleeve is provided with a positioning hole and a guide hole, the guide hole is a trumpet-shaped structure, the guide hole is located on the side of the positioning hole away from the floating space, the small end of the guide hole is connected to the guide hole, and the guide hole and the positioning hole can both surround the outside of the positioning ring wall. The positioning hole is used to limit the floating section from floating in the floating space by being tightly attached to the positioning ring wall.

[0011] The present invention also discloses a method for processing a center axis hole of a workpiece, which is implemented based on a second center hole processing device with a supporting and positioning floating tool as described above; the second center hole processing device includes: a second linear drive device, a movable seat, a rotary drive device and a supporting and positioning floating tool, the output end of the second linear drive device is connected to the movable seat, a rotary drive device is installed on the movable seat, and the output end of the rotary drive device is connected to the tool holder in the supporting and positioning floating tool. The method for processing the center axis hole of a workpiece includes the following steps: S1, prepare a workpiece, a first through hole and a second through hole are opened on the workpiece, the first through hole is a rough hole of the first axial center hole, and the second through hole is a rough hole of the second axial center hole; S2, face the a surface of the workpiece toward the tool of the first center hole processing device, and use the tool of the first center hole processing device to extend from the a surface of the workpiece to process the first through hole to obtain the first axial center hole; S3, move or flip the workpiece so that the b surface of the workpiece is aligned with the second center hole processing device with a supporting and positioning floating tool; S4, the second linear drive device in the second center hole processing device drives the movable seat, the rotary drive device, and the rotary drive device to rotate the workpiece to rotate the workpiece. A rotary drive device and a supporting and positioning floating tool, wherein the guide section and the positioning support edge in the supporting and positioning floating tool extend from the b surface into the first axial hole of the workpiece, and the positioning support edge is in close contact with the inner wall of the first axial hole; S5, the second linear drive device and the rotary drive device in the second center hole processing equipment are started simultaneously, and the first cutting part processes the inner wall or outer wall of the second through hole to obtain the second axial hole, the axis line of the second axial hole is in a straight line with the axis line of the first axial hole, and the diameter of the second axial hole is larger than the diameter of the first axial hole; S6, the second linear drive device in the second center hole processing equipment works, so that the supporting and positioning floating tool is away from the workpiece.

[0012] Compared with the prior art, the present invention has the following beneficial effects: In the present application, the guide section is used to achieve that after the first axial hole is processed from the a-side of the workpiece, the workpiece is moved relative to the entire supporting and positioning floating tool, or the workpiece is flipped relative to the entire supporting and positioning floating tool. At this time, the axis line of the first axial hole is difficult to be completely aligned with the axis line of the tool handle, and there must be a certain offset. This offset problem will cause the axis line of the processed second axial hole to be offset from the axis line of the first axial hole if the axis line around which the first cutting portion is processed is in a straight line with the axis line of the tool handle. When the axis line of the tool handle is moved or rotated due to the workpiece, and the workpiece moves or rotates to the point where the offset distance between the axis line of the first axial hole and the axis line of the tool handle is small, the supporting and positioning floating tool is driven by the second linear drive device, so that the guide section extends into the first axial hole, and the outer wall of the guide section is in close contact with the inner wall of the first axial hole, so that the guide of the lower half The axial centerline of the guided cutting execution structure is offset, that is, the axial centerline around which the first cutting part rotates is floatingly offset to a position aligned with the axial centerline of the first axial hole, that is: the axial centerline around which the first cutting part rotates is in a straight line with the axial centerline of the first axial hole, and there is a gap between the floating shell and the floating section. Although it can float, the driving arm fixed on the floating shell can still drive the guided cutting execution structure to rotate. Since there is a gap between the driving arm and the inner wall of the driving hole, especially the driving arm can move radially relative to the floating section, although the axial centerline around which the floating shell rotates is not in a straight line with the axial centerline of the floating section, the entire guided cutting execution structure can still be driven to rotate through the driving arm, thereby satisfying the guiding rotation effect of the inner wall of the first axial hole on the guide section, so that a workpiece with the axial centerline of the first axial hole and the axial centerline of the second axial hole highly overlaps is processed, thereby improving the quality of the workpiece product.

[0013] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a cross-sectional view of the workpiece.

[0015] Figure 2 It is a schematic diagram of the structure supporting the positioning floating tool.

[0016] Figure 3 It is a cross-sectional view of the supporting and positioning floating tool in Example 1 and Example 2.

[0017] Figure 4 It is a schematic diagram of the structure of the floating section and the driving arm.

[0018] Figure 5 It is a cross-sectional view of the supporting and positioning floating tool in Example 3 and Example 4.

[0019] Figure numerals: first axial hole 11, second axial hole 12, a surface 13, b surface 14, guided cutting execution structure 2, guide section 21, middle section 22, floating section 23, positioning support edge 24, first cutting part 25, knife connecting structure 3, floating shell 31, knife handle 32, driving arm 33, axial positioning structure 5, electromagnet 51, permanent magnet 52, positioning sleeve 53, reset spring 54. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, objectives and functions of the present invention clearer and easier to understand, the present invention is further described below in conjunction with the accompanying drawings and specific embodiments: Example 1

[0021] like Figure 2 as well as Figure 3 As shown, this embodiment discloses a supported and positioned floating tool, comprising: a guided cutting execution structure 2 and a knife connecting structure 3; the guided cutting execution structure 2 comprises: a guide section 21, an intermediate section 22, a floating section 23, a positioning support ridge 24 and a first cutting portion 25, one end of the intermediate section 22 is connected to the guide section 21, and the other end of the intermediate section 22 is connected to the floating section 23, the guide section 21 protrudes outward to form a positioning support ridge 24, and the outer walls of all the positioning support ridges 24 are surrounded to form a positioning wall, and the positioning wall is on the outer wall of a cylinder, and the positioning wall is used to be in close contact with the inner wall of the first axial hole 11 of the workpiece, and the first cutting portion 25 protrudes from the intermediate section 22, and the first cutting portion 25 is used to cut the inner wall or outer wall of the second axial hole 12 in the workpiece; the knife connecting structure 3 comprises: a floating shell 31 and a knife handle 32, the floating shell 31 forms a floating space, the floating space is for the floating section 23 to extend into, and the floating space is for the floating section 23 to float in the radial direction, and the knife handle 32 is installed at one end of the floating shell 31 away from the intermediate section 22.

[0022] The end a-surface 13 of the guide section 21 away from the middle section 22 is the tip end a-surface 13, and the tip end a-surface 13 is connected to the positioning wall of the positioning support rib 24 through the arc guide a-surface 13. The tip end a-surface 13 makes it easier for the end of the guide section 21 away from the middle section 22 to extend into the first axial center hole 11 of the workpiece.

[0023] The floating space includes: a cylindrical section and a truncated cone section, the cylindrical section is located at the end of the truncated cone section away from the first cutting portion 25, the cylindrical section is connected to the small section of the truncated cone section, and the large end of the truncated cone section extends toward the direction of the first cutting portion 25. The size of the cylindrical section controls the floating range of the floating section 23, preventing the floating section 23 from floating too much and affecting the guide section 21 from extending into the first axial center hole 11, thereby achieving the guide section 21 being able to extend into the first axial center hole 11 when slightly offset.

[0024] like Figure 4As shown, a driving arm 33 is protruded on the inner wall of the floating space, and the driving arm 33 extends into the driving hole opened at the top of the floating section 23, and the driving arm 33 can move radially relative to the floating section 23. It is ensured that when the axis of the entire guided cutting execution structure 2 containing the floating section 23 deviates from the axis of the floating shell 31, the floating shell 31 and the handle 32 rotate around their own axis, and the driving arm 33 adapts to the axis deviation and moves in the driving hole, and can still drive the entire guided cutting execution structure 2 to rotate through the driving arm 33, that is, the first cutting part 25 rotates around the axis of the first axis hole 11, thereby realizing the function that the guided cutting execution structure 2 can still be driven to rotate by the floating shell 31 and the handle 32 after the axis is deviated. Of course, there are other ways for the floating shell 31 to drive the guided cutting execution structure 2 to rotate, not just the one described in the embodiment. Example 2

[0025] like Figures 2 to 4 As shown, this embodiment discloses a method for processing a center axis hole of a workpiece, and the method for processing the center axis hole of the workpiece is implemented based on a second center hole processing equipment with a supported and positioned floating tool as described in Example 1; the second center hole processing equipment includes: a second linear drive device, a movable seat, a rotation drive device and a supported and positioned floating tool, the output end of the second linear drive device is connected to the movable seat, a rotation drive device is installed on the movable seat, and the output end of the rotation drive device is connected to the tool holder 32 in the supported and positioned floating tool. The workpiece center axis hole processing method comprises the following steps: S1, prepare a workpiece, the workpiece is provided with a first through hole and a second through hole, the first through hole is a rough hole of the first axis center hole, and the second through hole is a rough hole of the second axis center hole; S2, point the a surface of the workpiece toward the tool of the first center hole processing equipment, and use the tool of the first center hole processing equipment to extend from the a surface of the workpiece into the first through hole for processing to obtain the first axis center hole; S3, move or flip the workpiece so that the b surface of the workpiece is aligned with the second center hole processing equipment with a supporting and positioning floating tool; S4, the second linear drive device in the second center hole processing equipment drives the moving seat, the rotary A rotary drive device and a supporting and positioning floating tool, wherein the guide section and the positioning support edge in the supporting and positioning floating tool extend from the b surface into the first axial hole of the workpiece, and the positioning support edge is in close contact with the inner wall of the first axial hole; S5, the second linear drive device and the rotary drive device in the second center hole processing equipment are started simultaneously, and the first cutting part processes the inner wall or outer wall of the second through hole to obtain the second axial hole, the axis line of the second axial hole is in a straight line with the axis line of the first axial hole, and the diameter of the second axial hole is larger than the diameter of the first axial hole; S6, the second linear drive device in the second center hole processing equipment works, so that the supporting and positioning floating tool is away from the workpiece. Example 3

[0026] The difference between this embodiment and the first embodiment is that this embodiment has a cutting function of forming a second cutting portion between the bottom ends of two adjacent positioning support edges 24, and a corresponding axis positioning mechanism is added, and other structures are the same.

[0027] like Figure 5 As shown, a second cutting portion is formed between two adjacent positioning support ribs 24, and the second cutting portion is located at the connection between the positioning support rib 24 and the tip end a surface 13; an axis positioning structure 5 is installed on the floating housing 31, and the axis positioning structure 5 can move on the axis line of the tool handle 32. The axis positioning structure 5 is used to limit the floating of the floating section 23 and the first cutting portion 25 by acting beside the first cutting portion 25. That is, the gap at the bottom end of the positioning support rib 24 also has the function of finely machining the first through hole to obtain the first axis hole 11, that is, the tool of the first center hole processing equipment in Example 2 can also be the second center hole processing equipment with a supporting and positioning floating tool in this application.

[0028] The axis positioning structure 5 includes: an electromagnet 51, a permanent magnet 52 and a positioning sleeve 53. The electromagnet 51 is fixed in the floating shell 31. The positioning sleeve 53 is installed in the electromagnet 51. The positioning sleeve 53 can move on the axis of the tool handle 32 relative to the floating shell 31. The permanent magnet 52 is fixed on the positioning sleeve 53. A reset spring 54 is installed between the inner wall of the floating shell 31 and the positioning sleeve 53. The reset spring 54 is used to keep the positioning sleeve 53 retracted into the floating shell 31. The electromagnet 51 is used to sleeve the positioning sleeve 53 on the outside of the positioning annular wall next to the first cutting portion 25 after being energized. The positioning annular wall is formed by the outer wall of the middle section 22, and the positioning annular wall is located on the side of the first cutting portion 25 close to the floating space. The axis positioning structure 5 realizes that when the first through hole is processed into the first axis line, the electromagnet 51 is energized so that the positioning sleeve 53 is sleeved outside the positioning ring wall, so that the axis line of the entire guided cutting execution structure 2 and the axis line of the tool handle 32 are in a straight line, thereby avoiding arbitrary deflection when using the supporting positioning floating tool in this application to process the first through hole into the first axis hole 11.

[0029] The positioning sleeve 53 is provided with a positioning hole and a guide hole. The guide hole is a trumpet-shaped structure. The guide hole is located on the side of the positioning hole away from the floating space. The small end of the guide hole is connected to the guide hole. Both the guide hole and the positioning hole can surround the outside of the positioning circular ring wall. The positioning hole is used to restrict the floating section 23 from floating in the floating space by being in close contact with the positioning circular ring wall. The guide hole makes it easier for the positioning sleeve 53 to be sleeved outside the positioning circular ring wall. Example 4

[0030] like Figure 5As shown, this embodiment discloses a method for processing a center axis hole of a workpiece, and the method for processing the center axis hole of the workpiece is implemented based on a second center hole processing equipment with a supported and positioned floating tool as described in Example 3; the second center hole processing equipment includes: a second linear drive device, a movable seat, a rotation drive device and a supported and positioned floating tool, the output end of the second linear drive device is connected to the movable seat, a rotation drive device is installed on the movable seat, and the output end of the rotation drive device is connected to the tool holder 32 in the supported and positioned floating tool.

[0031] The workpiece center axis hole processing method comprises the following steps: S1, prepare a workpiece, the workpiece is provided with a first through hole and a second through hole, the first through hole is a rough hole of the first axial center hole, and the second through hole is a rough hole of the second axial center hole; S2, point the a surface of the workpiece toward the tool of the first center hole processing equipment, and use the tool of the first center hole processing equipment to extend from the a surface of the workpiece into the first through hole for processing to obtain the first axial center hole, the first center hole processing equipment is implemented by the second center hole processing equipment with the supporting positioning floating tool as described in Example 3, before processing, the electromagnet 51 drives the positioning sleeve 53 with the permanent magnet 52 to move to the state of surrounding the positioning ring wall to obtain the first axial center hole 11; S3, move or flip the workpiece so that the b surface of the workpiece is aligned with the supporting floating tool. The second center hole processing equipment for supporting and positioning the floating tool is aligned; S4, the second linear drive device in the second center hole processing equipment drives the moving seat, the rotary drive device and the supporting and positioning floating tool, the guide section and the positioning support rib in the supporting and positioning floating tool extend from the b surface into the first axial hole of the workpiece, and the positioning support rib is in close contact with the inner wall of the first axial hole; S5, the second linear drive device and the rotary drive device in the second center hole processing equipment are started at the same time, the first cutting part processes the inner wall or outer wall of the second through hole to obtain the second axial hole, the axis line of the second axial hole is in a straight line with the axis line of the first axial hole, and the diameter of the second axial hole is larger than the diameter of the first axial hole; S6, the second linear drive device in the second center hole processing equipment works, so that the supporting and positioning floating tool is away from the workpiece.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. Supporting and positioning floating tool, characterized in that: include: A guided cutting execution structure and a knife connection structure; The guide cutting execution structure includes: a guide section, an intermediate section, a floating section, a positioning support ridge and a first cutting portion. One end of the intermediate section is connected to the guide section, and the other end of the intermediate section is connected to the floating section. The guide section protrudes outward to form a positioning support ridge. The outer walls of all the positioning support ridges surround to form a positioning wall. The positioning wall is on the outer wall of a cylinder. The positioning wall is used to be in close contact with the inner wall of the first axial center hole of the workpiece. The first cutting portion protrudes from the intermediate section. The first cutting portion is used to cut the inner wall or outer wall of the second axial center hole in the workpiece. The knife connection structure comprises: a floating shell and a knife handle. The floating shell forms a floating space for the floating section to extend into and for the floating section to float radially. The knife handle is installed at one end of the floating shell away from the middle section.

2. The supporting and positioning floating tool according to claim 1, characterized in that: The end face of the guide section facing away from the middle section is a tip end face, and the tip end face is connected to the positioning wall of the positioning support edge through an arc guide surface.

3. The supporting and positioning floating tool according to claim 2, characterized in that: The floating space includes: a cylindrical section and a truncated cone section. The cylindrical section is located at one end of the truncated cone section away from the first cutting portion. The cylindrical section is connected to the small section of the truncated cone section. The large end of the truncated cone section extends toward the direction of the first cutting portion.

4. The supporting and positioning floating tool according to claim 3 is characterized in that: A second cutting portion is formed between two adjacent positioning support edges, and the second cutting portion is located at the connection between the positioning support edge and the tip end surface; An axis positioning structure is installed on the floating housing. The axis positioning structure can move on the axis line of the tool handle. The axis positioning structure is used to limit the floating of the floating section and the first cutting part by acting beside the first cutting part.

5. The supporting and positioning floating tool according to claim 4, characterized in that: The axis positioning structure includes: an electromagnet, a permanent magnet and a positioning sleeve. The electromagnet is fixed in a floating shell. A positioning sleeve is installed in the electromagnet. The positioning sleeve can move on the axis of the tool handle relative to the floating shell. A permanent magnet is fixed on the positioning sleeve. A reset spring is installed between the inner wall of the floating shell and the positioning sleeve. The reset spring is used to keep the positioning sleeve retracted into the floating shell. The electromagnet is used to put the positioning sleeve on the outside of the positioning annular wall next to the first cutting part after power is turned on. The positioning annular wall is formed by the outer wall of the middle section. The positioning annular wall is located on the side of the first cutting part close to the floating space.

6. The supporting and positioning floating tool according to claim 5, characterized in that: The positioning sleeve is provided with a positioning hole and a guide hole. The guide hole is a trumpet-shaped structure. The guide hole is located on the side of the positioning hole away from the floating space. The small end of the guide hole is connected to the guide hole. Both the guide hole and the positioning hole can be surrounded by the positioning ring wall. The positioning hole is used to limit the floating section from floating in the floating space by being tightly attached to the positioning ring wall.

7. A method for machining a center axis hole of a workpiece, characterized in that: The workpiece center axis hole processing method is implemented based on a second center hole processing device with a supporting and positioning floating tool as described in any one of claims 1 to 6; the second center hole processing device comprises: a second linear drive device, a moving seat, a rotation drive device and a supporting and positioning floating tool, the output end of the second linear drive device is connected to the moving seat, a rotation drive device is installed on the moving seat, and the output end of the rotation drive device is connected to the tool holder of the supporting and positioning floating tool; The workpiece center axis hole machining method comprises the following steps: S1. Prepare a workpiece, which has a first through hole and a second through hole, wherein the first through hole is a rough hole of the first axial center hole, and the second through hole is a rough hole of the second axial center hole; S2, facing the a-side of the workpiece toward the tool of the first center hole processing device, and using the tool of the first center hole processing device to extend from the a-side of the workpiece into the first through hole to obtain a first axial hole; S3, moving or turning the workpiece so that the b surface of the workpiece is aligned with the second center hole processing device with a supporting and positioning floating tool; S4, the second linear drive device in the second center hole processing equipment drives the moving seat, the rotation drive device and the supporting and positioning floating tool, the guide section and the positioning support edge in the supporting and positioning floating tool extend from the b surface into the first axial center hole of the workpiece, and the positioning support edge is in close contact with the inner wall of the first axial center hole; S5, the second linear drive device and the rotary drive device in the second center hole processing equipment are started simultaneously, and the first cutting part processes the inner wall or outer wall of the second through hole to obtain a second axial hole, the axis of the second axial hole is in a straight line with the axis of the first axial hole, and the diameter of the second axial hole is larger than the diameter of the first axial hole; S6. The second linear drive device in the second center hole processing equipment works, so that the supporting and positioning floating tool is away from the workpiece.

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