Tooth surface machining process for shaft workpiece

Abstract

The invention discloses a tooth surface machining process for shaft workpieces, and belongs to the technical field of machining. The method comprises the following steps: machining radially-distributed first tooth surfaces of a plane tooth shape on a first flat plate through a grinding machine to form a first gear rolling plate half body; and a second tooth surface which is obliquely arranged in an inclined surface tooth form is machined on the side edge of the second flat plate to form a second gear rolling plate half body. And the two half bodies are aligned, spliced and fixed to form the complete gear rolling plate. The rolling device is installed on rolling equipment, arranged on the two sides of a workpiece respectively and moves oppositely, the surface of the workpiece is extruded, and a rack which extends along the axis and is provided with a taper angle at the tooth end is rolled. The gear rolling plate is divided into the first gear rolling plate half body in the plane tooth shape and the second gear rolling plate half body in the conical tooth shape to be machined respectively, and then the first gear rolling plate half body and the second gear rolling plate half body are aligned and spliced, so that the technical problem that a tooth end taper angle structure is difficult to manufacture through a traditional integral gear rolling plate is solved, and a taper angle tooth end with a leading-in function can be stably and reliably rolled on a workpiece; the assembly performance is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of mechanical processing, and particularly relates to a tooth surface machining process for shaft workpieces. BACKGROUND

[0002] In the field of mechanical manufacturing, the tooth-shaped structure (such as a rack, a spline, etc.) on the surface of a shaft workpiece is widely used in key functional components such as transmission, guidance and connection. With the increasing requirements of industrial equipment on transmission accuracy, assembly efficiency and running stability, the workpiece tooth surface not only needs to have high dimensional accuracy and surface quality, but also often needs to be designed with a taper angle structure at the tooth end to achieve smooth meshing with other parts, reduce assembly stress or improve load distribution.

[0003] At present, the forming process of the tooth surface of a shaft workpiece mainly includes milling, gear hobbing, gear shaping and cold rolling, etc. Among them, the cold rolling forming technology is widely used in mass production and high-precision tooth shape machining due to its high production efficiency, high material utilization rate and the ability to significantly improve the hardness and fatigue strength of the tooth surface. This process usually uses a pair of thread rolling plates with complementary tooth shapes to reciprocally extrude the workpiece on a special rolling equipment, so as to plastically form the required tooth shape on the surface of the workpiece.

[0004] However, the existing thread rolling plates are mostly of integral structure, and the tooth surface shape is limited by the complexity of the machining process, especially when realizing the tooth end with a taper angle or the tooth shape with a variable cross-section along the axial direction. The traditional method often manufactures such thread rolling plates through integral grinding or electro-processing, which not only has a long processing cycle and high cost, but also is difficult to ensure the accuracy and consistency of the tooth shape transition area. In addition, once the thread rolling plate is locally worn or damaged, it usually needs to be replaced as a whole, which has a high maintenance cost. SUMMARY

[0005] The present application is directed to the above-mentioned problems existing in the prior art, and proposes a tooth surface machining process for a shaft workpiece which realizes high-precision forming of complex tooth shapes such as tooth end with taper angle and tooth depth gradual change.

[0006] The present application can be realized through the following technical solutions:

[0007] A tooth surface machining process for a shaft workpiece, comprising the following steps:

[0008] S1, preparing a first thread rolling plate half: using a grinding machine to process a first tooth surface distributed along the radial direction of a first flat plate to form a first thread rolling plate half, the first tooth surface being a planar tooth shape;

[0009] S2, preparing a second thread rolling plate half: using a grinding machine to process a second tooth surface located on the side of a second flat plate to form a second thread rolling plate half, the second tooth surface being an inclined surface tooth shape arranged obliquely relative to the plane;

[0010] S3、assembly of the toothed plate: after the first tooth surface and the second tooth surface are aligned, the first toothed plate half and the second toothed plate half are fixed to form a complete toothed plate;

[0011] S4, roll forming: the workpiece and the two toothed plates are installed on a roll forming device, the two toothed plates are arranged on the left and right sides of the workpiece and oppositely, the two toothed plates are driven to move towards each other and press the surface of the workpiece, and through the rolling action of the tooth surface, the rack with tooth ends with a taper angle is formed on the surface of the workpiece along the axial direction.

[0012] As a further improvement of the present application, in step S1, a flat positioning tool is installed on the machining platform of the grinder, and the first flat plate is machined by being placed on the flat positioning tool.

[0013] As a further improvement of the present application, in step S2, an inclined surface positioning tool is installed on the machining platform of the grinder, and the second flat plate is machined by being placed on the inclined surface positioning tool.

[0014] As a further improvement of the present application, in step S1, when machining the first tooth surface, a large grinding wheel of the grinder is used to perform rough machining on the first flat plate to form a tooth surface profile, and then a small grinding wheel is used to perform fine machining on the first tooth surface.

[0015] As a further improvement of the present application, in step S2, when machining the second tooth surface, a large grinding wheel of the grinder is used to perform rough machining on the second flat plate to form a tooth surface profile, and then a small grinding wheel is used to perform fine machining on the second tooth surface.

[0016] As a further improvement of the present application, in step S1, the machining depth of the first tooth surface gradually increases or decreases along the length direction of the first toothed plate half.

[0017] As a further improvement of the present application, in step S2, the machining depth of the second tooth surface gradually increases or decreases along the length direction of the second toothed plate half.

[0018] As a further improvement of the present application, in step S3, when the first toothed plate half and the second toothed plate half are spliced, the depth variation characteristics of the first tooth surface and the second tooth surface are kept aligned with each other.

[0019] As a further improvement of the present application, in step S2, the second tooth surface is a tapered tooth end structure.

[0020] As a further improvement of the present application, in step S3, the first toothed plate half and the second toothed plate half are fixed by screw connection.

[0021] Compared with the prior art, the present application has the following advantages:

[0022] 1. Efficient processing of complex tooth profile: By dividing the gear hobbing plate into a first gear hobbing plate half with a planar tooth profile and a second gear hobbing plate half with an inclined / tapered tooth profile, respectively processing, and then aligning and splicing the two, the technical problem of the traditional integral gear hobbing plate being difficult to manufacture a tooth end taper angle structure is solved, and a tapered tooth end with a lead-in function can be stably and reliably rolled on the workpiece, improving the assembly performance.

[0023] 2. Improve processing precision and surface quality: Use a grinding machine combined with a planar / inclined positioning tool to process the tooth surface, and implement a composite process of "large grinding wheel rough machining + small grinding wheel fine machining", which effectively ensures the straightness, contour accuracy and surface finish of the tooth surface; The depth change trend is continuous and aligned during splicing, ensuring smooth transition of the overall tooth profile and avoiding forming defects.

[0024] 3. Enhance process flexibility and production flexibility: The split structure supports modular design, and only needs to replace the second gear hobbing plate half with different inclination angles or tooth depth parameters to adapt to various taper angle requirements, without the need to manufacture a complete set of gear hobbing plates, significantly improving the adaptability of the process to multi-variety, variable parameter products.

[0025] 4. Reduce tooling cost and maintenance difficulty: Screw connection is used to realize detachable assembly of the gear hobbing plate halves, and when local wear or damage occurs, only the corresponding half needs to be replaced, avoiding total scrap, prolonging the service life of the gear hobbing plate, and reducing production cost and downtime.

[0026] 5. Avoid thermal deformation and ensure connection stability and repeat accuracy: Compared with welding, screw connection is completed at room temperature, eliminating material deformation, microstructure changes and hardness unevenness caused by high temperature, and maintaining high repeat positioning accuracy after multiple disassembly and assembly, ensuring consistency and process reliability. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a structure diagram of the gear hobbing plate of the present application;

[0028] Figure 2 is a structure diagram of the first gear hobbing plate half of the present application;

[0029] Figure 3 is a structure diagram of the second gear hobbing plate half of the present application;

[0030] Figure 4 is a structure diagram of the workpiece after processing of the present application;

[0031] Figure 5 is a processing position diagram of the grinding wheel on the first gear hobbing plate half of the present application;

[0032] Figure 6is a schematic view of a machining position of a grinding wheel on a second gear hobbing plate half according to the present application;

[0033] Figure 7 is a schematic view of a position of two gear hobbing plates and a workpiece to be machined on a rolling device according to the present application;

[0034] Figure 8 is a schematic view of a structure of a grinding machine according to the present application;

[0035] Figure 9 is a schematic view of a structure of a large grinding wheel and a small grinding wheel on a grinding machine according to the present application.

[0036] In the figure, 100, gear hobbing plate; 110, first gear hobbing plate half; 111, first tooth surface; 120, second gear hobbing plate half; 121, second tooth surface;

[0037] 200, grinding machine; 210, grinding wheel; 220, planar positioning tool; 230, inclined surface positioning tool;

[0038] 300, workpiece; 310, straight rack segment; 320, tapered tooth end. DETAILED DESCRIPTION

[0039] The following is a specific embodiment of the present application and further describes the technical method of the present application in combination with the accompanying drawings, but the present application is not limited to these embodiments.

[0040] As shown in the figure, the present application provides a tooth surface machining process for a shaft workpiece, including the following steps: Figures 1-9

[0041] S1, preparing a first gear hobbing plate half 110: using a grinding machine 200 to machine a first tooth surface 111 distributed along the radial direction of a first flat plate to form a first gear hobbing plate half 110, the first tooth surface 111 being a planar tooth shape, in the actual machining process, the feed amount, tool path and rotation speed of the grinding wheel 210 can be accurately controlled to ensure that the first tooth surface 111 has good straightness and surface finish, providing basic precision guarantee for subsequent splicing and forming;

[0042] S2, preparing a second gear hobbing plate half 120: using a grinding machine 200 to machine a second tooth surface 121 located on the side of a second flat plate to form a second gear hobbing plate half 120, the second tooth surface 121 being an inclined tooth shape arranged obliquely relative to the plane, the inclined tooth shape can be customized according to the required taper angle of the target workpiece 300 tooth end, and the inclination angle is controllable, thereby realizing precise matching of the taper angle of the final rack tooth end lead-in segment;

[0043] ​S3, assemble the gear rolling plate 100: after aligning the first tooth surface 111 with the second tooth surface 121, splice and fix the first gear rolling plate half 110 and the second gear rolling plate half 120 to form a complete gear rolling plate 100. During the splicing process, the continuity of the first tooth surface 111 and the second tooth surface 121 in height, angle and tooth profile should be ensured to avoid steps or misplacement and ensure smooth transition of the overall tooth surface to meet the consistency requirements of roll forming;

[0044] S4, roll forming: install the workpiece 300 and the two gear rolling plates 100 on the roll forming equipment. The two gear rolling plates 100 are placed on the left and right sides of the workpiece 300 and are arranged oppositely. Drive the two gear rolling plates 100 to move towards each other and extrude the surface of the workpiece 300. Through the rolling action of the tooth surface, the rack (i.e. the rack has a straight rack section 310 and a tapered tooth end 320) is formed on the surface of the workpiece 300 along the axial direction. During the rolling process, the two gear rolling plates 100 apply pressure synchronously to realize continuous and stable cold plastic forming.

[0045] Compared with the prior art, the machining process provided by the embodiment has at least the following advantages:

[0046] 1. Efficient machining of complex tooth profile: By dividing the gear rolling plate 100 into two gear rolling plate halves for planar tooth profile and inclined tooth profile, respectively, and then aligning and splicing the two halves, the technical problem of the traditional integral gear rolling plate 100 being difficult to machine the tooth end with a tapered angle structure is solved, and the tapered angle tooth end with a guide function can be reliably formed on the shaft workpiece 300.

[0047] 2. Improve processing flexibility and adjustability: The split structure allows different angle inclined tooth profiles to be replaced flexibly, and only the second gear rolling plate half 120 needs to be adjusted to adapt to various tapered angle requirements, without the need to manufacture a whole gear rolling plate 100, significantly improving process adaptability and production flexibility.

[0048] 3. Ensure forming precision and surface quality: The sand grinder 200 is used for tooth surface finishing machining to obtain high surface finish and dimensional consistency, reducing subsequent grinding processes; at the same time, the complete tooth surface formed after splicing has smooth transition, avoiding defects such as burrs and edge collapse at the tooth end of the formed rack.

[0049] 4. Reduce manufacturing cost and maintenance difficulty: When the gear rolling plate 100 is locally worn or damaged, only the corresponding half needs to be replaced instead of the whole, effectively reducing tool cost and downtime, especially suitable for mass production environment.

[0050] Overall, the process ensures high efficiency and high precision while realizing controllable forming of complex tooth structure, combining economy and practicality, and having good industrial application prospect.

[0051] Preferably, in step S1, a planar positioning tool 220 is installed on the machining platform of the grinding machine 200, and the first flat plate is placed horizontally on the planar positioning tool 220 for machining, thereby forming a planar tooth profile distributed radially along the first flat plate;

[0052] During machining, the first flat plate is precisely positioned and clamped by the planar positioning tool 220, ensuring that its reference surface is completely parallel to the machining plane of the grinding machine 200. The grinding wheel 210 reciprocates along the top surface of the first flat plate under the control of the numerical control program, gradually forming the required tooth profile. Since the workpiece 300 is in a horizontal stable state, the grinding wheel 210 is uniformly stressed, ensuring consistent tooth groove depth and high linear degree of tooth direction, thereby obtaining a high-precision planar tooth surface.

[0053] In step S2, an inclined positioning tool 230 is installed on the machining platform of the grinding machine 200, and the second flat plate is placed obliquely on the inclined positioning tool 230 for machining. That is, the second tooth surface 121 is not machined as a whole on the wide plane of the second flat plate, but is locally modified and formed for the specific corner edge in the inclined installation state;

[0054] Specifically, when the second flat plate is fixed at a set angle by the inclined positioning tool 230 on the workbench of the grinding machine 200, one of its lateral edges (i.e., the edge where the upper surface meets the side surface) is exposed to the action range of the grinding wheel 210. Under the control of the numerical control trajectory, the grinding wheel 210 performs micro-cutting along the obliquely arranged corner edge, gradually forming an inclined tooth profile structure with a specific pitch, height, and inclination direction.

[0055] It should be noted here that the second tooth surface 121 machined on the surface of the second flat plate is a tapered tooth end structure, i.e., its tooth profile presents a tapered surface shape that gradually narrows or rises in space, used to form a tapered corner segment that smoothly transitions axially at the end of the rack of the workpiece 300.

[0056] Preferably, in steps S1 and S2, the machining of the first tooth surface 111 and the second tooth surface 121 both adopts a step-by-step process strategy of "rough machining + fine machining", specifically:

[0057] In step S1, when machining the first tooth surface 111, a large grinding wheel on the grinding machine 200 is first used for rough machining of the first flat plate, quickly removing the excess amount through a larger cutting force and material removal rate, and initially forming the basic profile, pitch, and height of the tooth surface. Then, a small grinding wheel is replaced for fine machining, which utilizes its finer abrasive structure and higher running stability to finely grind the tooth surface, correct surface microscopic unevenness, and improve tooth profile accuracy and smoothness;

[0058] Similarly, when processing the second tooth surface 121 in step S2, the rough profile of the tooth surface is first completed on the inclined clamped second flat plate corner edge by a large grinding wheel, and then the tooth profile is precisely ground along the inclined trajectory by a small grinding wheel, ensuring smooth transition, accurate angle, no burr or edge collapse.

[0059] The two-stage grinding wheel 210 processing technology fully combines the advantages of high efficiency of large grinding wheel and high precision of small grinding wheel, which not only ensures the economy of processing rhythm, but also meets the strict requirements of the forming tool for surface quality of the thread rolling plate 100. In order to avoid interference, the grinding machine 200 disassembles the other grinding wheel when using one of the grinding wheels.

[0060] Preferably, in step S1, the processing depth of the first tooth surface 111 gradually increases or decreases along the length direction of the first thread rolling plate half 110, that is, the depth of the tooth profile continuously changes from one end to the other end, forming an axially varying tooth depth structure; Similarly, in step S2, the processing depth of the second tooth surface 121 is also designed to gradually increase or decrease along the length direction of the second thread rolling plate half 120.

[0061] The depth change can be realized by precisely controlling the feed amount of the numerical control grinding machine 200. In the rough machining and finishing process, the grinding wheel 210 gradually adjusts the depth of cut along the length direction according to the preset function (such as linear, segmented linear), so as to form a tooth surface structure with axially varying tooth depth characteristics on the first and second thread rolling plate halves 120 respectively.

[0062] This gradually varying depth design makes the complete thread rolling plate 100 formed by the final combination have a continuously varying forming ability in the overall length direction, effectively reducing the impact load in the initial stage of rolling and improving the forming stability.

[0063] Further, after the first thread rolling plate half 110 and the second thread rolling plate half 120 are processed, precise alignment and splicing are required. During the splicing process, it is particularly required that the depth change trend of the first tooth surface 111 and the second tooth surface 121 is continuously aligned and smoothly transitioned at the splicing interface.

[0064] Specifically, the two thread rolling plate halves should be butt jointed along the length direction, so that the tooth depth of the end of the first tooth surface 111 is completely consistent with the tooth depth of the corresponding position of the starting end of the second tooth surface 121, and the tooth pitch, tooth direction and profile curve in the entire splicing area are seamlessly connected.

[0065] The design purpose of the splicing structure is to eliminate the forming defects caused by sudden change of tooth depth or discontinuity of profile. Only when the gradual change trend of tooth depth of the two half hobbing plates is accurately matched in space, a complete rack with axial continuity, no step and no stress concentration point can be formed in the subsequent rolling process, especially ensuring the smooth transition between the tooth end with taper angle section and the main tooth section, and improving the machining precision of the workpiece 300.

[0066] Among them, the first half hobbing plate 110 and the second half hobbing plate 120 are fixed and connected by screw connection. In the specific implementation process, counterbores or threaded holes are opened on the joint surface of the two half hobbing plates, and high-strength screws are used to apply pre-tightening force in the direction perpendicular to the splicing surface, so that the two halves are tightly fitted and locked.

[0067] To ensure the stability and repeatability of the connection, the splicing surface is subjected to precision grinding treatment to ensure that the flatness and roughness meet the requirements, and auxiliary guide structures such as positioning pins or keyways can be provided to realize quick and accurate assembly alignment. The distribution interval of the screws is reasonably arranged according to the overall size and stress condition of the hobbing plate 100, and is usually densely arranged at both ends and the middle key stress area to prevent loosening, deformation or micro-motion wear during high-load rolling.

[0068] It should be noted that the screw connection has obvious advantages over welding. Because welding will generate high temperature in the splicing area, causing local thermal deformation and microstructure change of the material, which is easy to cause warping of the whole hobbing plate 100, size misalignment of the tooth surface or uneven hardness, and then affect the machining precision of the workpiece 300. Even subsequent complex shape correction and heat treatment repair are required, which increases the manufacturing cost and cycle. The screw connection is a mechanical fastening method, which is in a normal temperature state throughout the process, avoiding thermal stress and thermal deformation problems, and can maximize the maintenance of the precise tooth shape and material performance stability of the two halves after machining.

[0069] Secondly, welding is a permanent connection, which is difficult to disassemble once welded, resulting in the necessity of scrapping or high-difficulty repair of the whole hobbing plate 100 when a local part (such as the second half hobbing plate 120 bearing the taper angle forming) is worn, tooth broken or fatigue damaged after long-term use, causing resource waste. The screw connection is a detachable connection, which supports quick replacement of damaged half, retains the intact part for continuous use, greatly improves the maintainability and service life of the tool, reduces the production cost, and is especially suitable for flexible production demand of multi-variety and variable parameter products.

[0070] In addition, screw connection facilitates high-precision repeated assembly. Through cooperation of positioning pins, reference surfaces and preset torque control, stable relative position relationship can be maintained after multiple disassembly and assembly, ensuring consistency of tooth surface transition each time of splicing, while welding is difficult to ensure batch consistency due to uneven shrinkage of the fusion zone. Meanwhile, the screw connection structure is more conducive to checking, tightening or adjusting the splicing state in actual use, thereby improving the safety and process controllability of equipment operation.

[0071] Overall, compared with welding, screw connection not only avoids welding defects such as thermal deformation and deterioration of the structure, but also has multiple advantages such as detachability, easy maintenance, high repeated precision and low cost, and is more suitable for the use requirements of the gear rolling plate 100 as a high-precision, long-life and reusable forming tool, and is an ideal connection method for realizing efficient, stable and economic operation of the split gear rolling plate 100.

[0072] The technical means disclosed in the present application scheme is not limited to the technical means disclosed in the above technical means, but also includes technical solutions composed of any combination of the above technical features. The above is a specific embodiment of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the principles of the present application, several improvements and refinements can be made, which are also considered within the scope of protection of the present application.

[0073] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications will also change accordingly.

[0074] In addition, the descriptions such as "first", "second", "one" and the like in the present application are only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited. The terms "connection", "fixing" and the like should be understood broadly, for example, "fixing" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For ordinary skilled persons in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0075] The technical solutions among various embodiments of the present application can be combined with each other, but must be based on that a person skilled in the art can realize, when the combination of the technical solutions appears contradictory or cannot be realized, it should be considered that the combination of the technical solutions does not exist, and is not within the protection scope required by the present application.

[0076] The specific embodiments described herein are merely illustrative of the principles of this application. Numerous modifications or adaptations will be readily apparent to those skilled in the art of the present application without departing from the spirit of the present application or the scope of the claims set forth below.

Claims

1. A tooth surface machining process for shaft-type workpieces, characterized in that, Includes the following steps: S1. Preparation of the first tooth rolling plate half: A grinding wheel is used to process a first tooth surface distributed radially on a first plate to form the first tooth rolling plate half. The first tooth surface is a planar tooth shape. S2. Preparation of the second tooth rolling plate half: A second tooth surface located on the side of the second plate is machined using a grinding wheel to form the second tooth rolling plate half. The second tooth surface is an inclined tooth shape that is inclined relative to the plane. S3. Assemble the tooth rolling plate: After aligning the first tooth surface with the second tooth surface, the first tooth rolling plate half and the second tooth rolling plate half are spliced ​​and fixed to form a complete tooth rolling plate. S4. Roll forming: The workpiece and the two tooth rolling plates are installed on the processing equipment. The two tooth rolling plates are placed on the left and right sides of the workpiece and arranged in a vertically opposite manner. The two tooth rolling plates are driven to move towards each other and squeeze the surface of the workpiece. Through the rolling action of the tooth surface, a toothed rack extending along its axial direction and with a tapered tooth tip is formed on the surface of the workpiece.

2. The tooth surface machining process for a shaft-type workpiece according to claim 1, characterized in that, In step S1, the first flat plate is placed on the processing platform of the grinding machine.

3. The tooth surface machining process for a shaft-type workpiece according to claim 1, characterized in that, In step S2, the second plate is placed at an angle on the processing platform of the grinding machine.

4. The tooth surface machining process for a shaft-type workpiece according to claim 1, characterized in that, In step S1, when machining the first tooth surface, the large grinding wheel of the grinding machine is first used to rough machine the first plate to form the tooth surface profile, and then the small grinding wheel is used to finish machine the first tooth surface.

5. The tooth surface machining process for a shaft-type workpiece according to claim 1, characterized in that, In step S2, when machining the second tooth surface, the large grinding wheel of the grinding machine is first used to rough machine the second plate to form the tooth surface profile, and then the small grinding wheel is used to finish machine the second tooth surface.

6. The tooth surface machining process for a shaft-type workpiece according to claim 1, characterized in that, In step S1, the machining depth of the first tooth surface gradually increases or decreases along the length of the first tooth rolling plate half.

7. The tooth surface machining process for a shaft-type workpiece according to claim 1, characterized in that, In step S2, the machining depth of the second tooth surface gradually increases or decreases along the length of the second tooth rolling plate half.

8. The tooth surface machining process for a shaft-type workpiece according to claim 1, characterized in that, In step S3, when the first tooth rolling plate half and the second tooth rolling plate half are spliced ​​together, the depth change characteristics of the first tooth surface and the second tooth surface remain aligned with each other.

9. The tooth surface machining process for a shaft-type workpiece according to claim 1, characterized in that, In step S2, the second tooth surface has a tapered tooth end structure.

10. The tooth surface machining process for a shaft-type workpiece according to claim 1, characterized in that, In step S3, the first toothed plate half and the second toothed plate half are fastened together by screws.

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