Method for machining a split cylindrical spreader

Abstract

The application relates to a spliced cylindrical expansion piece processing method. The spliced cylindrical expansion piece processing method comprises the following sequential steps: S1. fixing an auxiliary clamp; S2. fixing a spliced single body in the auxiliary clamp; S3. sleeving a first annular positioning sleeve and expanding the spliced single body; S4. loading a matching block between the upper ends of the spliced single body; S5. processing a center hole on the matching block; and S6. extending a top pin into the center hole and processing the outer circle of the spliced single body. The application has the advantages that the outer circle precision of the spliced cylindrical expansion piece can be improved, so that the workpiece can be better positioned.

Description

Technical Field

[0001] This invention particularly relates to a method for processing spliced ​​cylindrical support components. Background Technology

[0002] Chinese Patent Application No. 201910955762.X discloses a magnetic bonding device inside a machine casing, which achieves contact and adhesion between the magnet and the interior of the casing by radially moving the magnet. The above solution includes a spliced ​​cylindrical support for contacting the magnet, which is typically manufactured using wire cutting. The cylindrical workpiece is first fixed on a lathe for outer diameter machining, and then cut into several spliced ​​units using wire cutting. All the spliced ​​units constitute the spliced ​​cylindrical support. However, during wire cutting, factors such as excessively high machining speed, excessively high discharge voltage, insufficient discharge power, or insufficient coolant may cause the workpiece to overheat, resulting in radial deformation of the spliced ​​units. Alternatively, internal stress in the material (usually aluminum or copper) may also cause radial deformation if the stress is not released during wire cutting. This results in the inability to guarantee the flatness and roundness of the outer surfaces of all the spliced ​​individual units when they come into contact with the workpiece, leading to poor performance and low accuracy of the spliced ​​cylindrical support when positioning the workpiece. Summary of the Invention

[0003] The purpose of this invention is to provide a method for processing spliced ​​cylindrical support components that can improve the outer diameter accuracy of the components, thereby enabling better positioning of the workpiece.

[0004] To achieve the above objectives, the following technical solution is adopted: a method for processing spliced ​​cylindrical support components, characterized by comprising the following sequential steps:

[0005] S1. Fix the auxiliary component on the lathe's rotating fixture; the auxiliary component includes a fixed seat and a movable block disposed on the fixed seat that can move radially along the spliced ​​cylindrical support member, the fixed seat being used to be clamped and fixed by the rotating fixture, the movable block being used to be fixed to the lower end of the spliced ​​unit, each spliced ​​unit being fixed to one movable block;

[0006] S2. Fix several modular units onto the movable block of the auxiliary component;

[0007] S3. The first annular positioning sleeve is placed on the outside of all the spliced ​​units, and the moving block of the auxiliary component moves outward so that the outer circular surface of all the spliced ​​units contacts the inner circular surface of the first annular positioning sleeve.

[0008] S4. Fix the mating block for mating with the top between the upper ends of all the spliced ​​units so that the side wall of the mating block contacts the inner wall of all the spliced ​​units; a fixing structure is provided between the upper end of the spliced ​​unit and the mating block;

[0009] S5. A center hole for mating with the center point is machined on the mating block;

[0010] S6. Fit the center point with the center hole of the mating block, and machine the outer circle of all spliced ​​units;

[0011] The method of this invention directly machines the outer cylindrical surfaces of several modular units, avoiding the conventional approach of first machining the outer cylindrical surface of a complete cylindrical body and then wire-cutting it, thus preventing deformation of the modular units due to wire cutting. Furthermore, through the cooperation of auxiliary components and the first annular positioning sleeve, the method simulates the state of the modular cylindrical support when in use, and machines the outer circles of several modular units in this state, ensuring good flatness and roundness of the outer circles of the modular cylindrical support during use. By machining a center hole on the mating block to mate with the center point, it is convenient to align the center point and facilitate machining.

[0012] Among them, the spliced ​​unit was initially made by wire cutting of a cylindrical workpiece, but the spliced ​​unit has a certain machining allowance, which is processed by the solution of the present invention.

[0013] The auxiliary component assists in the radial movement of the modular unit, thus simulating the unfolded state of the modular cylindrical support during use. Furthermore, lathe chucks are typically three-jaw chucks used to hold workpieces, and usually, the jaws of these chucks are not machined with fixed structures (e.g., screw holes) to mate with the modular unit, as this would be too costly. Also, the number of modular units can be two, four, or even six, and the three-jaw chuck does not have the same number of jaws. Therefore, machining the fixed structures to mate with the modular unit on the moving blocks of the smaller, lower-cost auxiliary component offers better versatility, and allows for the creation of auxiliary components with different numbers of moving blocks depending on the number of modular units. For example, when there are two modular units, the auxiliary component can be any existing two-jaw chuck capable of enabling radial movement of the modular units.

[0014] The mating block not only has a machined center hole to mate with the tip, but also has an interference fit with the inner wall of the spliced ​​unit, and has a part that can open up the upper end of the spliced ​​unit to simulate the state of the spliced ​​unit in use; the outer circular surface of the spliced ​​unit in this state is machined for higher precision.

[0015] Preferably, in step S1, after the auxiliary component is fixed on the lathe's rotation fixture, the coaxiality of the auxiliary component and the rotation axis of the lathe's rotation fixture is detected. If the coaxiality of the auxiliary component and the lathe's rotation fixture is within the standard range, it meets the coaxiality requirement; if it is not within the standard range, it needs to be adjusted.

[0016] By employing the above methods, the coaxiality of the auxiliary components is ensured, thereby guaranteeing high coaxiality at the beginning and ensuring accuracy during the processing of spliced ​​units.

[0017] Preferably, in step S3, the moving block of the auxiliary component moves outward so that the outer circular surface of several spliced ​​units contacts the inner circular surface of the first annular positioning sleeve. Then, the coaxiality of all spliced ​​units with the rotation axis of the lathe rotation fixture is detected. If the coaxiality of the spliced ​​units with the rotation axis of the lathe rotation fixture is within the standard range, it meets the coaxiality requirement; if it is not within the standard range, adjustment is required.

[0018] The coaxiality check in step S3 is to determine whether the coaxiality of the modular units can be guaranteed after they are fixed to the moving block of the auxiliary component. After ensuring that the coaxiality of several modular units meets the requirements, the next step, step S4, can be performed to install the mating block; otherwise, it cannot be guaranteed that the modular units will be coaxially positioned during installation. Specifically, the runout of the outer diameter of several modular units should be within 15 microns.

[0019] Preferably, in step S6, after the center point mates with the center hole of the mating block, the coaxiality of all the spliced ​​units and the rotation axis of the lathe rotation fixture is checked. If the coaxiality of the spliced ​​units and the rotation axis of the lathe rotation fixture is within the standard range, it meets the coaxiality requirement; if it is not within the standard range, it needs to be adjusted.

[0020] A final coaxiality check is performed before machining to ensure that the coaxiality of all assembled units meets the standards.

[0021] Preferably, the measuring end of the dial indicator is brought into contact with the circumferential sidewall of the auxiliary component, and the auxiliary component is rotated. If the runout value of the dial indicator exceeds the range, the auxiliary component is re-clamped by a self-rotating clamp or corrected by tapping the auxiliary component with a copper rod. The runout value is then re-tested by the dial indicator. If the runout value still exceeds the range, the auxiliary component needs to be repaired or replaced.

[0022] Lathe self-rotating fixtures are typically three-jaw chucks. The self-centering accuracy of a three-jaw chuck is 0.05-0.15mm, which is relatively high. Therefore, the auxiliary components are adjusted by repeatedly retightening them. The method of tapping with a copper rod is used because copper is soft and will not damage the auxiliary components. The outer diameter runout of the auxiliary components must be within 3 microns.

[0023] Preferably, the measuring end of the dial indicator is brought into contact with the outer circular surface of the modular unit, and the modular unit is rotated. If the outer circular runout value of the modular unit exceeds the range, the modular unit is reinstalled on the moving block for adjustment, and the outer circular runout value of all modular units is remeasured using the dial indicator.

[0024] Typically, the moving block has screw holes, and the modular unit has fixing holes. The moving block and the modular unit are fixed by bolts passing through the fixing holes of the modular unit and threadedly engaging with the screw holes of the moving block. If the runout value of the outer circle of the modular unit exceeds the range, the modular unit and the moving block are reinstalled.

[0025] Preferably, the measuring end of the dial indicator is brought into contact with the outer circular surface of the spliced ​​unit, and the spliced ​​unit is rotated. If the runout value of the outer circle of the spliced ​​unit exceeds the range value, the mating block and several spliced ​​units are adjusted, and the runout value of the outer circle of all spliced ​​units is remeasured with the dial indicator.

[0026] The runout of the outer circles of several spliced ​​units is measured by a dial indicator to ensure the coaxiality of the spliced ​​cylindrical support components during the final machining process.

[0027] Preferably, in step S4, the upper end of the spliced ​​unit is provided with a mating groove that opens radially inward and extends axially upward through the top of the spliced ​​unit. The spliced ​​unit is provided with a fixing hole that extends radially through, and the mating block is provided with a mating block threaded hole that extends radially through. The outer wall of the mating block can contact the inner wall of the mating groove. The mating block is fixed to the spliced ​​unit by means of a bolt passing through the fixing hole and threadedly engaging with the mating block threaded hole.

[0028] By using bolts to pass through the fixing holes and engage with the threaded holes of the mating blocks, the fixing structure between the mating blocks and the assembled units is made simpler, and the threaded engagement method provides higher positioning accuracy.

[0029] Preferably, an insert is detachably fixed within the mating groove. The insert is used to mate with the mandrel. After step S6, the mating block is removed, the moving block of the auxiliary component moves inward, the first annular positioning sleeve is removed, and the insert is fixed to the mating groove of each spliced ​​unit. The second annular positioning sleeve is then fitted onto the outer side of the upper end of all spliced ​​units. The moving block of the auxiliary component then moves outward, causing the outer circular surfaces of several spliced ​​units to contact the inner circular surface of the second annular positioning sleeve, and the taper of the insert is machined.

[0030] When using the modular cylindrical support, a mandrel is typically inserted into the inner hole formed between the modular cylindrical support components to open them up. The inner hole at the end of each modular cylindrical support component has a certain taper, and the mandrel also has a certain taper, thus enabling the modular cylindrical support to open. A second annular positioning sleeve is fitted onto the outer side of the upper end of several modular units, ensuring that the outer circular surface of these units contacts the inner circular surface of the second annular positioning sleeve. This allows for more precise machining of the taper of the inserts, simulating the state when the mandrel is inserted. This invention has the following advantages: it improves the outer circular accuracy, flatness, and concentricity of the modular cylindrical support, thereby enabling better workpiece positioning during use. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the auxiliary component in Example 1.

[0032] Figure 2 This is a schematic diagram of the structure of the auxiliary component of Example 1 when it is equipped with a modular unit.

[0033] Figure 3 for Figure 2 A schematic diagram of the structure with the first annular positioning sleeve and the mating block installed.

[0034] Figure 4 for Figure 3 A structural diagram showing the structure when one of the modular units is removed.

[0035] Figure 5 This is a schematic diagram of the structure of the spliced ​​single unit after the outer circle is machined and the insert is assembled, as shown in Example 1.

[0036] Figure 6 This is a schematic diagram of the structure when preparing the insert for Example 1.

[0037] Figure 7 This is a cross-sectional view of the insert in Example 1.

[0038] Figure 8 This is a schematic diagram of the structure of the spliced ​​cylindrical support member in use in Example 1.

[0039] Figure 9 for Figure 8 A schematic diagram of the structure after removing the casing.

[0040] Figure 10 This is a schematic diagram of the structure of Example 2.

[0041] Reference numerals: Auxiliary component 1, Moving block 2, Horizontal part 21, Horizontal threaded hole 211, Vertical part 22, Vertical threaded hole 221, Spliced ​​unit 3, Outer circular surface 31, Support part 32, First fixing hole 33, Second fixing hole 34, Mating groove 35, Third fixing hole 36, Mating block 4, Mating block threaded hole 41, First annular positioning sleeve 51, Second annular positioning sleeve 52, Insert 6, Insert threaded hole 61, Insert conical surface 62, Core rod 100, Locking block 200, Housing 300, Magnet 400, Drive mechanism 500. Detailed Implementation

[0042] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0043] Example 1

[0044] like Figure 5 , Figure 8 and Figure 9 As shown, this embodiment 1 is a device for processing a spliced ​​cylindrical support for bonding magnets inside a housing. The spliced ​​cylindrical support has an outer circular surface 31 for positioning the magnet 400 on the spliced ​​unit 3, and a radially extending support portion 32 for supporting the magnet 400 is provided at the bottom of the outer circular surface 31.

[0045] It should be noted that, Figure 8 and Figure 9 Although the drive mechanism 500 used in this embodiment has the same structure as the auxiliary component 1 used in this invention, the drive mechanism 500 is required to move the spliced ​​unit 3 radially when the magnet is glued to the housing, resulting in the drive mechanism 500 having the same structure as the auxiliary component 1 in this invention. However, this does not mean that the drive mechanism 500 is the auxiliary component 1 of this invention. The auxiliary component 1 of this invention is only used to assist the radial movement of the spliced ​​unit 3, thereby simulating the open state of the spliced ​​cylindrical support member during use, so as to realize the machining of the outer cylindrical surface. If the spliced ​​cylindrical support member is used for an inner hole positioning fixture for a thin-walled part, the drive mechanism 500 may not be needed, and only a mandrel is needed. The auxiliary component in this embodiment 1 is any existing two-jaw chuck that can realize the radial movement of the spliced ​​unit.

[0046] When using the interlocking cylindrical support for bonding magnets within the housing, three magnets 400 are stacked axially on the support 32. Then, adhesive is applied to the inner wall of the housing 300 and fitted over the outer side of the magnets 400. The drive mechanism 500 drives the interlocking unit 3 to move radially outward, causing the magnets 400 to contact the inner wall of the housing 300, thus completing the bonding of the magnets to the housing. The magnets 400 contact the outer circular surface 31 of the interlocking unit 3. The precision of the outer circular surface 31 determines the precision of the bonding of the magnets 400 to the housing 300; therefore, the outer circular surface 31 of the interlocking unit 3 needs to be machined.

[0047] like Figure 1 As shown, the auxiliary component 1 has a circular outer cross-section. The auxiliary component 1 contains a motor (not shown in the figure). Two symmetrically arranged movable blocks 2 are located on the upper surface of the auxiliary component 1. The movable blocks 2 can move radially under the drive of the motor. The vertical cross-section of the movable block 2 is L-shaped. The movable block 2 includes a horizontal part 21 and a vertical part 22. The horizontal part 21 has a horizontally open threaded hole 211, and the vertical part 22 has a horizontally open threaded hole 211.

[0048] like Figure 2 The lower end of the modular unit 3 shown is provided with a vertically arranged first fixing hole 33 and a horizontally arranged second fixing block 34. The first fixing hole 33 is used to cooperate with the horizontal threaded hole 211, and the second fixing hole 34 is used to cooperate with the vertical threaded hole 211. The modular unit 3 and the moving block 2 are fixed by screwing in the bolts.

[0049] like Figure 3 As shown, when the moving block 2 moves radially outward, the circumferential outer wall of the lower end of the spliced ​​unit 3 will contact the circumferential inner wall of the first annular positioning sleeve 51, at which point the two spliced ​​units 3 form a complete circle.

[0050] like Figure 3 and Figure 4 As shown, the inner side of the spliced ​​unit 3 is provided with a mating groove 35 that axially penetrates the upper end of the spliced ​​unit 3 and opens inward. A mating block 4 for mating with a center is fitted between the mating grooves 35 of the two spliced ​​units 3. The mating block 4 has threaded holes 41 on both sides. A third fixing hole 36 is provided at the top of the spliced ​​unit 3, extending horizontally. A bolt passes through the third fixing hole 36 and threadedly engages with the mating block 4 to fix the mating block 4 to the spliced ​​unit 3. When the spliced ​​unit 3 is opened by the moving block, the mating block 4 is placed between the two mating grooves 35, and the mating block 4 is interference-fitted with the two mating grooves 35.

[0051] like Figure 5 , Figure 6 and Figure 7As shown, an insert 6 is fitted inside the groove 35. The insert 6 has a transverse opening and a threaded hole 61 for engaging with the third fixing hole 36. A bolt passes through the third fixing hole 36 and threadedly engages with the threaded hole 61 to fix the insert 35 to the spliced ​​unit 3. The upper end of the inner wall of the insert 35 has a tapered surface with a taper of 4°. The second annular positioning sleeve 52 is fitted on the outer circumferential side of the upper end of the spliced ​​unit 3. When the moving block 2 moves radially outward, the inner wall of the second annular positioning sleeve 52 contacts the outer circumferential wall of the spliced ​​unit 3, simulating the state when the mandrel 100 is inserted.

[0052] A method for processing a spliced ​​cylindrical support component includes the following sequential steps:

[0053] S1. Fix auxiliary component 1 on the three-jaw chuck of the lathe, and use a dial indicator to align the outer circumferential surface of auxiliary component 1 to ensure its coaxiality. Place the measuring end of the dial indicator in contact with the circumferential sidewall of the auxiliary component and rotate the auxiliary component. Measure the runout value of the outer diameter of auxiliary component 1 using the dial indicator. Determine whether auxiliary component 1 is coaxial with the rotation axis of the three-jaw chuck of the lathe based on the runout value. If the runout value of auxiliary component 1 exceeds 3 microns, re-clamp auxiliary component 1 multiple times using the three-jaw chuck or tap auxiliary component 1 with a copper rod to correct it. Measure the runout value of auxiliary component 1 again using the dial indicator. If the runout value still exceeds 3 microns, auxiliary component 1 needs to be repaired or replaced.

[0054] S2. Fix the two spliced ​​units 3 onto the movable block 2 of the auxiliary component 1;

[0055] S3. Place the first annular positioning sleeve 51 on the lower outer side of the two splicing units 3, and at the same time move the moving block 2 of the auxiliary component 1 outward so that the outer circular surface of the two splicing units 3 contacts the inner circular surface of the first annular positioning sleeve 51; align the outer circular surface of the two splicing units 3 with a dial indicator to make the two splicing units 3 coaxial; place the measuring end of the dial indicator in contact with the outer circular surface of the splicing unit, rotate the splicing unit, and measure the runout value of the outer circle of several splicing units with the dial indicator. Determine whether the two splicing units 3 are coaxial with the rotation axis of the three-jaw chuck based on the size of the runout value of the outer circle of the two splicing units. If the runout value of the outer circle of the splicing unit exceeds 15 microns, reinstall the splicing unit 3 on the moving block 2 for adjustment, and remeasure the runout value of the outer circle of the splicing unit with the dial indicator.

[0056] S4. Fix the mating block 4, which is used to mate with the top, between the upper ends of the two spliced ​​units. The mating block 4 is interference-fitted with the mating groove 35 and is fixed by bolts.

[0057] S5. A center hole for mating with the center point is machined on the mating block 4;

[0058] S6. After machining the center hole, align the center point with the center hole and use a dial indicator to align the outer surfaces of the two spliced ​​units. Place the dial indicator's probe against the outer surface of the spliced ​​unit and rotate it. Determine if the two spliced ​​units are coaxial based on the runout value of their outer diameters to ensure coaxiality during machining. If the runout value of the spliced ​​unit's outer diameter exceeds 15 microns, adjust the bolts used to fix the mating block and the spliced ​​unit by tightening them. Once the runout requirement is met, start the lathe and machine the outer diameters of the spliced ​​units.

[0059] S7. After completing the processing of the spliced ​​cylindrical support, remove the mating block 4, move the moving block 2 of the auxiliary component 1 inward, remove the first annular positioning sleeve 51, and fix the two inserts 6 to the mating groove 35 of each spliced ​​unit. Then, put the second annular positioning sleeve 52 on the outer side of the upper end of the two spliced ​​units. After that, move the moving block 2 of the auxiliary component 1 outward so that the outer circular surface of the two spliced ​​units 3 contacts the inner circular surface of the second annular positioning sleeve 52, and process the taper of the insert 6, with a taper of 4°.

[0060] Example 2

[0061] like Figure 10 As shown, the difference between Embodiment 2 and Embodiment 1 is that the spliced ​​cylindrical support in Embodiment 2 has four spliced ​​units 3. Therefore, the auxiliary component 1 can use any existing four-jaw chuck that can achieve radial movement and fixation of the four spliced ​​units 3. The mating block 4 can simultaneously position the four spliced ​​units 3 and have an interference fit with the four spliced ​​units 3 to ensure that the position of the four spliced ​​units 3 at this time is the same as the position of the four spliced ​​units 3 when in use.

Claims

1. A method of machining a split cylindrical dilator, comprising: The method comprises the following sequential steps: S1. Fixing an auxiliary assembly on a self-rotating clamp of a lathe; the auxiliary assembly comprises a fixing base and a moving block arranged on the fixing base and capable of moving radially along the spliced cylindrical spacer, the fixing base is used for being clamped and fixed by the self-rotating clamp, and the moving block is used for being fixed with the lower end of each spliced monomer, and each spliced monomer is fixed with one moving block; S2. Fixing a plurality of spliced monomers on the moving blocks of the auxiliary assembly; S3. sleeving a first annular positioning sleeve on the outer side of all the spliced monomers, moving the moving blocks of the auxiliary assembly outward, and making the outer circumferential surface of all the spliced monomers contact with the inner circumferential surface of the first annular positioning sleeve; S4. Fixing a cooperating block used for cooperating with a center in the upper end between all the spliced monomers, so that the side wall of the cooperating block contacts with the inner wall of all the spliced monomers; and a fixing structure is arranged between the upper end of the spliced monomer and the cooperating block; S5. Machining a center hole used for cooperating with the center on the cooperating block; S6. Cooperating the center with the center hole of the cooperating block, and turning the outer circle of all the spliced monomers.

2. The method of claim 1, wherein: In the S1, after the auxiliary assembly is fixed on the self-rotating clamp of the lathe, the coaxiality of the auxiliary assembly and the self-rotation axis of the self-rotating clamp of the lathe is detected, if the coaxiality of the auxiliary assembly and the self-rotation axis of the self-rotating clamp of the lathe is within the standard range, the coaxiality requirement is met; if not, adjustment is needed.

3. The method of claim 1, wherein: In the S3, after the moving blocks of the auxiliary assembly are moved outward and the outer circumferential surface of the plurality of spliced monomers contacts with the inner circumferential surface of the first annular positioning sleeve, the coaxiality of all the spliced monomers and the self-rotation axis of the self-rotating clamp of the lathe is detected, if the coaxiality of the spliced monomers and the self-rotation axis of the self-rotating clamp of the lathe is within the standard range, the coaxiality requirement is met; if not, adjustment is needed.

4. The method of claim 1, wherein: In the S6, after the center cooperates with the center hole of the cooperating block, the coaxiality of all the spliced monomers and the self-rotation axis of the self-rotating clamp of the lathe is detected, if the coaxiality of the spliced monomers and the self-rotation axis of the self-rotating clamp of the lathe is within the standard range, the coaxiality requirement is met; if not, adjustment is needed.

5. The method of claim 2, wherein: The detection end of the dial gauge contacts with the circumferential side wall of the auxiliary assembly, and the auxiliary assembly is rotated, if the run-out value of the dial gauge exceeds the range value, the auxiliary assembly is clamped again by the self-rotating clamp or is corrected by knocking the auxiliary assembly with a copper bar, and the run-out value is detected again by the dial gauge, if the run-out value still exceeds the range value, the auxiliary assembly needs to be repaired or replaced.

6. The method of claim 3, wherein: The detection end of the dial gauge contacts with the outer circumferential surface of the spliced monomer, and the spliced monomer is rotated, if the run-out value of the outer circle of the spliced monomer exceeds the range value, the spliced monomer is installed on the moving block again for adjustment, and the run-out value of the outer circle of all the spliced monomers is measured again by the dial gauge.

7. The method of claim 4, wherein: The detection end of the dial gauge contacts with the outer circumferential surface of the spliced monomer, and the spliced monomer is rotated, if the run-out value of the outer circle of the spliced monomer exceeds the range value, the cooperating block and the plurality of spliced monomers are adjusted, and the run-out value of the outer circle of all the spliced monomers is measured again by the dial gauge.

8. The method of claim 1, wherein: In the S4, the upper end of the spliced monomer is provided with a matching groove which is radially opened inward and axially penetrates the top of the spliced monomer, the spliced monomer is provided with a radially penetrating fixing hole, the matching block is provided with a radially penetrating matching block threaded hole, the outer wall of the matching block can contact with the inner wall of the matching groove, and the fixing of the matching block and the spliced monomer is realized through the threaded cooperation of the bolt penetrating the fixing hole and the matching block threaded hole.

9. The method of claim 8, wherein: The matching groove is detachably fixed with an inlay block, the inlay block is used to cooperate with the mandrel, after the S6 step, the matching block is taken out, the moving block of the auxiliary assembly moves inward, the first annular positioning sleeve is taken out, the inlay block is fixed with the matching groove of each spliced monomer, the second annular positioning sleeve is sleeved on the outer side of the upper end of all the spliced monomers, then the moving block of the auxiliary assembly moves outward, so that the outer cylindrical surface of the plurality of spliced monomers contacts with the inner cylindrical surface of the second annular positioning sleeve, and the taper of the inlay block is processed.

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