A method for finishing a flat shaft

Abstract

The application discloses a finishing method for a flat shaft, which comprises the following steps: S1, machining a weight block and a flat surface of a flat shaft roughcast; S2, assembling the weight block and the flat shaft roughcast to form a combined shaft, wherein the outer surface of the combined shaft is a circular arc structure, the diameter of the circular arc surface of the flat shaft roughcast is not less than a preset diameter size, and the diameter of the outer circumferential surface of the weight block is not greater than the preset diameter size of the flat shaft; and S3, finishing the outer circumferential surface of the combined shaft, so that the diameter of the combined shaft meets the requirement of the preset diameter size. Compared with the prior art, the finishing method for the flat shaft can reduce the deflection error generated during finishing of the flat shaft and improve the machining quality.

Description

Technical Field

[0001] This application relates to the field of bridge structure processing technology, and more specifically, to a method for precision machining of flat shafts. Background Technology

[0002] The roller in a suspension bridge's roller-type composite cable saddle has a flat shaft shape and includes a first plane, an arc surface, and a second plane, with the first and second planes located on opposite sides of the arc surface. As a crucial force-transmitting component of the suspension bridge's roller-type composite cable saddle, the roller transmits force through contact with the upper and lower components via the arc surface, thus requiring high machining precision. Specifically, the machining precision for the arc surface of the suspension bridge's roller-type composite cable saddle is Φ400±0.025mm×3500mm. While its machining rigidity is poor, the machining precision for the arc surface is high.

[0003] The existing technology for processing rollers involves using center positioning at both ends of the roller and grinding the arc surface. Due to the large length-to-width ratio of the roller, its rigidity is poor. The deflection is greatest when processing reaches the middle section of the part, and the roundness error of the arc surface can reach up to 0.23mm, which cannot meet the requirements of processing accuracy.

[0004] Therefore, there is an urgent need for a finishing method for flat shafts, which can be applied to the machining of roller-type composite cable saddle rollers for suspension bridges, to reduce the deflection error generated during the finishing of flat shafts and improve the machining quality. Summary of the Invention

[0005] To address the aforementioned technical problems, this application provides a finishing method for flat shafts, applicable to the machining of roller-type composite cable saddle rollers for suspension bridges. This method can reduce deflection errors generated during the finishing of flat shafts and improve machining quality.

[0006] The technical solution provided in this application is as follows:

[0007] A method for finishing flat shafts includes the following steps:

[0008] S1. Machining the flat surfaces of the counterweight and the flat shaft blank;

[0009] S2. Assemble the counterweight and the flat shaft blank to form a combined shaft. The outer surface of the combined shaft is specifically an arc-shaped structure. The diameter of the arc surface of the flat shaft blank is not less than a preset diameter size, and the diameter of the outer circumferential surface of the counterweight is not greater than the preset diameter size of the flat shaft.

[0010] S3. Finish the outer circumferential surface of the combined shaft so that the diameter of the combined shaft meets the requirements of the preset diameter size.

[0011] Preferably, the processing of the counterweight in step S1 specifically includes the following steps:

[0012] The counterweight blank is obtained by blanking, wherein the length of the counterweight blank is not greater than the length of the flat shaft blank, the counterweight blank is provided with a first surface and a second surface, wherein the first surface can cover the planar surface of the flat shaft blank, and the diameter of the inscribed circle of the second surface is greater than the preset diameter of the flat shaft.

[0013] The second surface of the counterweight blank is machined.

[0014] Preferably, the counterweight blank and the flat shaft blank are fixedly connected by screws.

[0015] Preferably, the processing of the counterweight in step S1 further includes the following steps:

[0016] The first screw hole is machined and spaced apart on the first surface.

[0017] Preferably, a plurality of the first screw holes form a first screw hole assembly, and the first screw holes in the first screw hole assembly are spaced apart along the length direction of the counterweight.

[0018] The first screw hole assembly is provided in at least two sets, and the first screw hole assembly is spaced apart along the width direction of the counterweight.

[0019] Preferably, the machining of the planar surface of the flat shaft blank in step S1 specifically includes the following steps:

[0020] The flat surface of the flat shaft blank is machined so that the dimension of the flat surface in the width direction meets the preset width dimension requirement;

[0021] A second screw hole is machined on the flat surface, and the second screw hole is provided in a one-to-one correspondence with the first screw hole.

[0022] Preferably, the flat shaft blank has two planar surfaces, and the two planar surfaces are respectively located on both sides of the arc surface of the flat shaft blank;

[0023] A composite shaft includes two counterweights, which are disposed on both sides of the flat shaft blank.

[0024] Preferably, step S2, which involves assembling the counterweight and the flat shaft blank to form a combined shaft, specifically includes the following steps:

[0025] S2.1. The first counterweight, the flat shaft blank, and the second counterweight are sequentially hoisted onto the support assembly, with the first screw hole and the second screw hole corresponding one-to-one.

[0026] S2.2 Select the fastening point, tighten the first screw of the first counterweight and the flat shaft blank at the fastening point, and then tighten the second screw of the second counterweight and the flat shaft blank at the fastening point.

[0027] S2.3 Repeat step S2.2 until both the first screw and the second screw are tightened.

[0028] Preferably, in step S2.3, the selection of the fastening point is carried out simultaneously from the middle of the combined shaft toward both ends of the combined shaft.

[0029] Preferably, two sets of support components are provided, and are respectively disposed at both ends of the combined shaft. The support components include:

[0030] Support frame;

[0031] A support block is fixed to the top of the support frame, and the support block is provided with a positioning surface that is adapted to the outer surface of the combined shaft.

[0032] The present invention provides a finishing method for flat shafts, applied to the machining of roller-type composite cable saddle rollers for suspension bridges. The method includes the following steps: machining the planar surfaces of the counterweight block and the flat shaft blank; assembling the counterweight block and the flat shaft blank to form a composite shaft; wherein the outer surface shape of the composite shaft is specifically an arc-shaped structure; the diameter of the arc surface of the flat shaft blank is not less than a preset diameter, meaning the arc surface of the flat shaft blank has a machining allowance; the diameter of the outer circumferential surface of the counterweight block is not greater than the preset diameter, so that the outer circumferential surface of the counterweight block is not machined during finishing the arc surface of the flat shaft blank; finally, the outer circumferential surface of the composite shaft is finished to ensure that the diameter of the composite shaft meets the preset diameter requirement.

[0033] Existing flat shafts have a large length-to-diameter ratio, high precision requirements for their curved surfaces, and poor machining stiffness. When machining the curved surfaces of flat shafts, especially in the middle section, the poor stiffness causes machining deflection, ultimately making it difficult to guarantee the cylindricity and dimensional tolerances of the outer diameter. In this technical solution, a counterweight is installed on the flat surface of the flat shaft, thus improving the solution to the problem of deflection caused by the poor stiffness. Therefore, compared with existing technologies, the precision machining method for flat shafts in this invention, when applied to the machining of roller-type composite cable saddle rollers for suspension bridges, can reduce the deflection error generated during the precision machining of flat shafts and improve machining quality. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 A schematic diagram of a roller-type combined cable saddle for a suspension bridge provided in an embodiment of the present invention;

[0036] Figure 2 A flowchart illustrating a method for finishing flat shafts provided in an embodiment of the present invention;

[0037] Figure 3 This is a schematic diagram of a counterweight blank provided in an embodiment of the present invention;

[0038] Figure 4 for Figure 3 The left view;

[0039] Figure 5 This is a schematic diagram of a flat shaft blank provided in an embodiment of the present invention;

[0040] Figure 6 This is a schematic diagram of a flat shaft blank after machining a planar surface, as provided in an embodiment of the present invention.

[0041] Figure 7 A schematic diagram of a structure for assembling a flat shaft blank and a counterweight block according to an embodiment of the present invention;

[0042] Figure 8 for Figure 7 The left view;

[0043] Figure 9 A schematic cross-sectional view of the combined shaft provided in an embodiment of the present invention.

[0044] Figure label:

[0045] 100. Roller; 200. Upper bearing plate; 300. Lower bearing plate; 400. Embedded grid; 500. Cable saddle assembly; 1. Counterweight block; 10. Counterweight block blank; 11. First surface; 12. Second surface; 2. Flat shaft; 21. Flat shaft blank; 22. Flat shaft blank after machining flat surface; 23. Flat surface; 24. Arc surface; 3. Screw; 41. Support block; 42. Support frame. Detailed Implementation

[0046] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0047] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly set on the other component; when a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to the other component.

[0048] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0049] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" or "several" means two or more, unless otherwise explicitly specified.

[0050] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0051] The embodiments of this invention are written in a progressive manner.

[0052] It should be noted that the finishing method provided in this application is applied to the machining of rollers in the combined cable saddle of suspension bridges. The rollers include flat surfaces and arc surfaces. When machining the arc surfaces, two centers are often used to position the two ends of the rollers directly, and the arc surfaces of the rollers are machined by grinding with a grinding wheel. The deflection is greatest when the rollers are machined to the middle section.

[0053] A schematic diagram of the structure of the roller-type combined cable saddle of the suspension bridge is shown below. Figure 1 As shown, the suspension bridge roller-type composite saddle includes a saddle assembly 500, an upper support plate 200, a roller 100, a lower support plate 300, and a pre-embedded grid 400 arranged sequentially from top to bottom. Among them, the roller is an important force transmission component of the suspension bridge roller-type composite saddle. The roller transmits force through contact between its arc surface and the upper support plate 200 and the lower support plate 300. Therefore, the machining accuracy of the arc surface of the roller 100 is required to be high. During the manufacturing process of suspension bridge roller-type composite cable saddle rollers, high machining precision is required for their arc surfaces. The machining dimensions of the suspension bridge roller-type composite cable saddle rollers are Φ400±0.025mm×3500mm, and the width between the two plane surfaces of the roller is 170mm. The roller has a large length-to-width ratio and poor machining rigidity. However, for high machining precision, when using existing machining methods to machine the outer cylindrical surface, the deflection is greatest when machining to the middle section of the part, and the roundness error of its arc surface can reach 0.23mm, which cannot meet the accuracy requirements of the drawings.

[0054] Please Figures 2 to 9 As shown, this embodiment of the invention provides a finishing method for flat shafts, used in the manufacture of roller-type composite cable saddle rollers for suspension bridges, comprising the following steps:

[0055] S1. Machining the counterweight 1 and the planar surface 23 of the flat shaft blank 21; wherein, the machining process of the counterweight 1 and the machining process of the planar surface 23 of the flat shaft blank 21 are not sequentially limited. Here, "flat shaft blank 21" refers to the flat shaft after rough machining. The flat shaft blank 21 has a planar surface 23 and an arc surface 24. The diameter of the flat shaft is preset to be R, and the width is preset to be L. The diameter of the flat shaft blank is R1, and the width is L1. The flat shaft blank has a finishing allowance.

[0056] S2. Assemble the counterweight 1 and the flat shaft blank 21 to form a combined shaft. The outer surface of the combined shaft is specifically an arc-shaped structure. The diameter of the arc surface 24 of the flat shaft blank 21 is not less than a preset diameter, and the diameter of the outer circumferential surface of the counterweight 1 is not greater than the preset diameter of the flat shaft. Assemble the counterweight 1 and the flat shaft blank 21 together to form the combined shaft. The counterweight 1 is located at one end of the flat surface 23 of the flat shaft blank 21. By assembling the counterweight 1 onto the flat shaft blank, the machining rigidity of the flat shaft blank can be increased, avoiding machining deflection. The diameter of the arc surface 24 of the flat shaft blank 21 is not less than a preset diameter, meaning that the arc surface 24 of the flat shaft blank 21 has a machining allowance. The diameter of the outer circumferential surface of the counterweight 1 is not greater than a preset diameter, so that when the arc surface 24 of the flat shaft blank 21 is finished, the outer circumferential surface of the counterweight 1 will not be machined.

[0057] S3. Finish-machine the outer circumferential surface of the combined shaft to ensure that the diameter of the combined shaft meets the preset diameter requirements. During the finish-machining of the outer circumferential surface of the combined shaft, two centers are used to position both ends of the combined shaft. The outer surface of the combined shaft is finished by turning or grinding. Because the rigidity of the combined shaft is greater than that of the individual flat shaft blank 21, the machining deflection generated during the machining process can be reduced, resulting in higher machining accuracy.

[0058] In the finishing method for flat shafts provided in this embodiment of the invention, by assembling a counterweight 1 on the planar surface 23 of the flat shaft blank 21, the rigidity of the flat shaft blank is improved and the problem of deflection during the finishing process is reduced.

[0059] It should be noted that "preset diameter dimension" refers to the diameter of the curved surface after the flat shaft is machined, that is, the diameter R of the curved surface required on the drawing. "Preset width dimension" refers to the width L of the flat shaft in the direction perpendicular to the plane surface 23 of the flat shaft after it is machined.

[0060] In the above method, as one embodiment, the machining of the counterweight 1 in step S1 of the finishing method for flat shafts in this embodiment of the invention includes the following steps:

[0061] The blanking yields 10 counterweight blocks. Please proceed as follows: Figure 3 and Figure 4As shown, the length of the counterweight blank 10 is not greater than the length of the flat shaft blank 21, that is, the length of the counterweight blank 10 is equal to the length of the flat shaft blank 21 or the length of the counterweight blank 10 is less than the length of the flat shaft blank 21. In this embodiment of the invention, the length of the counterweight blank 10 is less than the length of the flat shaft blank 21. The counterweight blank 10 is provided with a first surface 11 and a second surface 12. The first surface 11 is used in conjunction with the planar surface 23, and the first surface 11 can cover the planar surface 23 of the flat shaft blank 21. The diameter of the inscribed circle of the second surface 12 is greater than the preset diameter R of the flat shaft, that is, the counterweight blank 10 has a certain machining allowance T.

[0062] It should be noted that the second surface 12 of the counterweight blank 10 in the embodiments of the present invention can be an arc-shaped surface or a polygonal surface. Preferably, the second surface 12 of the counterweight blank 1010 in the embodiments of the present invention can be any one of a pentagonal surface, a hexagonal surface, a heptagonal surface or an octagonal surface.

[0063] The second surface 12 of the counterweight blank 10 is machined so that the diameter of the outer circumferential surface of the counterweight is not greater than the preset diameter size R, that is, the diameter of the outer circumferential surface of the counterweight is less than or equal to the preset diameter size of the flat shaft. When the diameter of the outer circumferential surface of the counterweight is larger, the machining stiffness of the combined shaft is higher. Preferably, the diameter of the machined second surface 12 is equal to the preset diameter size R of the flat shaft.

[0064] In the above method, as one embodiment, the counterweight 1 and the flat shaft blank 21 provided by the present invention are fixedly connected by screws 3. The counterweight 1 and the flat shaft blank 21 are fixedly connected by screws 3 to form a combined shaft.

[0065] In the above method, as one embodiment, the step S1 of processing the counterweight 1 provided by the present invention further includes the following step: processing the first screw holes, wherein the first screw holes are spaced apart on the first surface 11.

[0066] In the above method, as one specific implementation, the multiple first screw holes provided in the embodiment of the present invention form a first screw hole assembly. The first screws in the first screw hole assembly are spaced apart along the length direction of the counterweight 1. At least two sets of first screw hole assemblies are provided, and the first screw hole assemblies are spaced apart along the direction of the counterweight 1.

[0067] In the above method, as one implementation method, please refer to... Figure 5 and Figure 6 As shown, Figure 5 This is a schematic diagram of the structure of a flat shaft blank. Figure 6 This is a schematic diagram of the flat shaft blank after machining the flat surface. The dashed line represents the design structure of the flat shaft.

[0068] In step S1 of this embodiment of the invention, machining the planar surface 23 of the flat shaft blank 21 specifically includes the following steps: machining the planar surface 23 of the flat shaft blank 21 so that the dimension of the width direction of the planar surface 23 meets the requirements of the preset width dimension; that is, the width dimension of the planar surface 23 of the flat shaft blank 21 is L, but a second screw hole is machined on the planar surface 23, and the second screw hole is set in a one-to-one correspondence with the first screw hole.

[0069] In this embodiment, the flat shaft requires high machining accuracy for the arc surface 24. First, the planar surface 23 of the flat shaft blank 21 is precision machined, and then the arc surface 24 is precision machined. This avoids the influence of errors in the planar surface 23 of the flat shaft blank 21 on the precision machining error of the arc surface 24. In this embodiment, both the precision machining of the planar surface 23 and the arc surface 24 of the flat shaft can be performed using turning or grinding methods.

[0070] In the above method, the planar surface 23 of the flat shaft in the embodiment of the present invention can be provided with one, two or at least three, and the number of counterweights 1 is provided in a one-to-one correspondence with the planar surface 23 of the flat shaft. In the embodiment of the present invention, the counterweights 1 are mainly provided on the planar surface 23 of the flat shaft to increase the precision machining rigidity of the flat shaft and avoid the flat shaft from deflecting during machining due to the difference in rigidity, which would affect the precision machining accuracy of the flat shaft.

[0071] In this embodiment of the invention, the suspension bridge roller-type combined cable saddle roller is provided with two planar surfaces, and the two planar surfaces are respectively provided on both sides of the arc surface 24. Thus, a combined shaft includes two counterweight plates, and the two counterweight blocks 1 are respectively provided on both sides of the flat shaft blank 23 after machining the planar surfaces.

[0072] Please Figures 7 to 9As shown, in the assembly of the flat shaft blank and the counterweight 1, since the roller has two planar surfaces 23, two counterweights 1 need to be set. If the first counterweight and the flat shaft blank are fully assembled before assembling the second counterweight and the flat shaft blank, subsequent assembly will be difficult. As one embodiment, in step S2 of this embodiment, assembling the counterweight 1 and the flat shaft blank after machining the planar surfaces to form a combined shaft specifically includes the following steps: S2.1, sequentially hoisting the first counterweight, machining the planar surfaces... The flat shaft blank and the second counterweight are mounted on the support assembly. The positions of the first counterweight, the machined flat surface, the flat shaft blank, and the second counterweight are adjusted so that the first screw hole and the second screw hole are aligned one-to-one. S2.2 Select the fastening point and tighten the first screw on the first counterweight and the flat shaft blank at the fastening point, then tighten the second screw on the second counterweight and the flat shaft blank at the fastening point. S2.3 Repeat step S2.2, alternately tightening the first and second counterweights until both the first and second screws are tightened. This improves assembly.

[0073] In the above method, as one implementation, in step S2.2 of this embodiment of the invention, the selection of the fastening point is carried out simultaneously from the middle of the combined shaft toward both ends of the combined shaft.

[0074] In the above method, as one embodiment, the support components in this invention are provided in two sets, and are respectively provided at both ends of the combined shaft. The support components include: a support frame 42; a support block 41 fixed to the top of the support frame 42, and the support block 41 is provided with a positioning surface adapted to the outer surface of the combined shaft.

[0075] Furthermore, in this embodiment of the invention, the positioning surface on the support block 41 is specifically any one of a V-shaped surface, a U-shaped surface, or an arc-shaped surface.

[0076] In this embodiment of the invention, a roller-type combined cable saddle roller for a suspension bridge is used as an example for specific description.

[0077] The preset diameter of the flat shaft is 400mm, the preset width is 170mm, the diameter of the arc surface 24 of the flat shaft blank after rough machining is 406mm, the width of the two plane surfaces 23 of the flat shaft blank is 176mm, and the outer surface of the flat shaft blank has a finishing allowance.

[0078] The counterweight blank 10 is obtained by blanking, and then the counterweight blank 10 is precision machined to remove the machining allowance on the counterweight blank 10 so that the diameter of the second surface of the counterweight is equal to 400mm.

[0079] The two planar surfaces of the flat shaft blank are machined so that the width between the two planar surfaces 23 is 170mm, which meets the design requirements.

[0080] The counterweight blank 10 is installed onto the flat shaft blank after machining the flat surface to form a combined shaft. At this time, in order to avoid machining the counterweight during finishing, the diameter of the combined shaft passing through the counterweight should not exceed 400mm.

[0081] The two ends of the combined shaft are positioned by centers, and the outer surface of the combined shaft is precision machined by grinding to make the diameter of the arc surface 24 of the combined shaft 400mm. Through the inventor's practice, a high precision of 0.02mm was achieved, and the processing efficiency was improved by more than 2 times.

[0082] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for finishing a flat shaft, characterized in that, The method comprises the following steps: S1, processing the flat surface of the weight block and the flat surface of the flat shaft rough blank; S2, assembling the weight block and the flat shaft rough blank to form a combined shaft, the outer surface of the combined shaft is a circular arc structure, the diameter of the circular arc surface of the flat shaft rough blank is not less than the diameter of the flat shaft, and the diameter of the outer circumferential surface of the weight block is not greater than the diameter of the flat shaft; S3, finishing the outer circumferential surface of the combined shaft, so that the diameter of the combined shaft meets the diameter requirement; Wherein, the flat shaft rough blank is provided with two flat surfaces, and the two flat surfaces are respectively arranged on both sides of the circular arc surface of the flat shaft rough blank; one combined shaft comprises two weight blocks, and the two weight blocks are arranged on both sides of the flat shaft rough blank; Further, the step S1 of processing the weight block comprises the following steps: Cutting the weight block rough blank, wherein the length of the weight block rough blank is not greater than the length of the flat shaft rough blank, the weight block rough blank is provided with a first surface and a second surface, the first surface can cover the flat surface of the flat shaft rough blank, and the diameter of the inscribed circle of the second surface is greater than the diameter of the flat shaft; Processing the second surface of the weight block rough blank; The weight block rough blank and the flat shaft rough blank are fixedly connected through screws.

2. The finishing method for the flat shaft according to claim 1, wherein The step S1 of processing the weight block further comprises the following steps: Processing the first screw hole, and the first screw hole is arranged on the first surface.

3. The finishing method for the flat shaft according to claim 2, wherein A plurality of first screw holes form a first screw hole assembly, and the first screw holes in the first screw hole assembly are arranged along the length direction of the weight block; The first screw hole assembly is provided with at least two groups, and the first screw hole assemblies are arranged along the width direction of the weight block.

4. The finishing method for the flat shaft according to claim 3, wherein The step S1 of processing the flat surface of the flat shaft rough blank comprises the following steps: Processing the flat surface of the flat shaft rough blank, so that the width of the flat surface meets the width requirement; Processing the second screw hole on the flat surface, and the second screw hole is arranged one by one with the first screw hole.

5. The finishing method for the flat shaft according to claim 4, wherein The step S2 of assembling the weight block and the flat shaft rough blank to form a combined shaft comprises the following steps: S2.1, hoisting the first weight block, the flat shaft rough blank and the second weight block to the support assembly in sequence, and the first screw hole and the second screw hole are arranged one by one; S2.2, selecting a fastening point, tightening the first screw of the first weight block and the flat shaft rough blank at the fastening point, and then tightening the second screw of the second weight block and the flat shaft rough blank at the fastening point; S2.3, repeating step S2.2 until the first screw and the second screw are tightened.

6. The finishing method for flat shafts according to claim 5, characterized in that, In step S2.3, the selection of the fastening points is carried out simultaneously from the middle of the combined shaft to both ends of the combined shaft.

7. The finishing method for flat shafts according to claim 5 or 6, characterized in that, The support assembly is provided with two groups, and is respectively arranged at both ends of the combined shaft, and the support assembly comprises: a support frame; a support block fixed on the top of the support frame, and a positioning surface adapted to the outer surface of the combined shaft is arranged on the support block.

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