A chamfering tool for the tooth profile of the gear end face with a disc-shaped helical blade structure and its design method

Abstract

The present invention provides a chamfering tool for the end face tooth profile of a gear with a disc-shaped helical cutting edge structure and a design method thereof, relating to the technical fields of gear machining and its tools. The chamfering tool for the end face tooth profile of a gear with a disc-shaped helical cutting edge structure includes a left gear chamfering tool and a right gear chamfering tool. The right gear chamfering tool includes a substrate and cutting teeth, and the cutting teeth are fixedly connected to the radial side surface of the substrate. The substrate is a disc-shaped structure with a frustum protrusion provided on one side. The cutting teeth include a rake face, a flank face, and a cutting edge. The rake face and the flank face are adjacent to each other, and the cutting edge is located between the rake face and the flank face. The chamfering tool is designed based on the single-degree-of-freedom point-contact gear cutting meshing condition, and the precise cutting edge shape of the chamfering tool can be calculated according to the chamfer amount of the gear end face. The number of cutting teeth of the chamfering tool designed by the present invention is 6 to 10 times that of the traditional chamfering tool, and the tool service life is longer.

Description

Technical Field

[0001] The present invention relates to the technical field of gear machining and its cutting tools, and specifically to a gear end face tooth profile chamfering tool with a disk-shaped helical cutting edge structure and its design method. Background Art

[0002] Gears are key basic components in many industries, and their quality directly affects the transmission accuracy and working performance of mechanical systems. With the rapid development of China's equipment manufacturing industry, the demand for gears is increasing, and higher requirements are also put forward for the manufacturing accuracy, transmission quality, and service life of gears.

[0003] Gear chamfering is a machining process that uses special tools to cut or extrude the edges of the gear end face, which can solve problems such as burrs falling off the gear edges, scratching the tooth surface, generating meshing noise, and stress concentration at the gear edges, which are prone to knocking and breaking. Therefore, it can reduce gear meshing noise, improve gear transmission accuracy, and extend the service life of gears.

[0004] Currently, the commonly used gear tooth profile chamfering methods mainly fall into three categories: The first category is the extrusion chamfering method designed based on the principle of forced backlash-free meshing cold extrusion. The extrusion chamfering tool is a cutter head type, and the two sides of the cutter teeth are helical tooth surfaces with different helix angles. During the chamfering process, the tool body continuously extrudes the gear tooth profile within the chamfering depth at the tooth end, and part of the metal of the tooth profile is extruded to both sides of the cutter teeth. The second category is the rolling chamfering method designed based on the principle of hobbing cutting. The rolling chamfering tool is similar to a hob, the cutter teeth are designed with a back angle, and it has a certain regrinding service life. During the chamfering process, the tool and the gear perform a continuous generating cutting motion to remove the metal on the tooth profile edge. The third category is the milling chamfering method based on the profiling principle. The tool uses a finger milling cutter with an inclined cutting edge, and the tool continuously moves along with the gear tooth profile during rotation, thereby realizing the edge milling process.

[0005] However, although the first category of extrusion chamfering method has high chamfering efficiency, the excess metal extruded during the chamfering process will slip onto the tooth surface and cause convex deformation, affecting the tooth surface quality and shape accuracy. The second category of rolling chamfering method has fewer cutter teeth on the designed rolling chamfering tool, poor tool durability, and poor bilateral chamfering uniformity of the obtained tooth profile. The third category of milling chamfering method is mainly applied to the tooth profile chamfering process of large module gears, and has low chamfering efficiency in the field of small and medium module gears. Summary of the Invention

[0006] (1) Technical Problems to be Solved

[0007] Aiming at the deficiencies of the prior art, the present invention provides a chamfering tool for the end face tooth profile of a gear with a disc-shaped helical cutting edge structure and its design method, which solves the problems that the excess metal extruded during the chamfering process will slide onto the tooth surface to generate convex deformation, affecting the tooth surface quality and profile accuracy, as well as the small number of cutting teeth of the chamfering tool, poor tool durability and low chamfering efficiency in the field of medium and small module gears.

[0008] (II) Technical solution

[0009] To achieve the above objectives, the present invention is realized through the following technical solutions: A chamfering tool for the end face tooth profile of a gear with a disc-shaped helical cutting edge structure, including a left gear chamfering tool and a right gear chamfering tool. The right gear chamfering tool includes a substrate and cutting teeth. The cutting teeth are fixedly connected to the radial side surface of the substrate. The substrate is a disc-shaped structure with a frustum protrusion on one side. The cutting teeth include a rake face, a flank face and a cutting edge. The rake face and the flank face are adjacent to each other. The position of the cutting edge is between the rake face and the flank face.

[0010] Preferably, the number of the cutting teeth is multiple. The surface of the substrate is provided with mounting holes. The number of the mounting holes is multiple. The multiple mounting holes are one large hole and four small holes. The four small holes are annularly arrayed with the center of the large hole as the center.

[0011] A design method for a chamfering tool for the end face tooth profile of a gear with a disc-shaped helical cutting edge structure includes the following steps:

[0012] Step 1: Given gear parameters and the chamfering height of the gear end face tooth profile;

[0013] Step 2: Initially determine the tool diameter;

[0014] Step 3: Select tool mounting angle parameters, specifically including: the angle between the line connecting the tool rotation center and the symmetry center of the workpiece tooth groove and the horizontal line, and the tool mounting shaft intersection angle;

[0015] Step 4: Calculate tool mounting position parameters, specifically including: the horizontal distance of the tool center relative to the gear center along the X-axis direction, and the vertical distance of the tool center relative to the gear end face;

[0016] Step 5: Design tool geometric structure parameters, specifically including: the number of tool teeth, the tool helix angle, the back angle of the tool top edge, and the inclination angle of the tool rake face;

[0017] Step 6: Divide the gear end face tooth profile into a left tooth profile and a right tooth profile along the symmetry center of the tooth groove. According to Steps 2 to 5, select tool parameters and tool mounting parameters in sequence, and calculate the chamfering tool edge shape curves of the left tooth profile and the right tooth profile of the gear end face respectively;

[0018] Step 7: Calculate the final diameters of the chamfering tools for the left tooth profile and the right tooth profile respectively.

[0019] Step 8: Calculate the horizontal distances of the chamfering tool centers for the left tooth profile and the right tooth profile relative to the gear center along the Y-axis direction respectively.

[0020] Preferably, the selection range of the angle η between the connecting line of the tool rotation center and the symmetric center of the workpiece tooth groove and the horizontal line in Step 3 is 30° to 50°, and the selection range of the shaft intersection angle Σ between the tool and the workpiece in Step 3 is -60 to 60°.

[0021] Preferably, the horizontal distance of the tool center relative to the gear center along the X-axis direction and the vertical distance of the tool center relative to the gear end face in Step 4 are calculated according to Formula (1) and Formula (2) respectively:

[0022]

[0023] where, D0 is the initial diameter of the chamfering tool, η is the angle between the connecting line of the tool center and the symmetric center of the gear tooth groove and the vertical line, df is the root circle diameter of the gear, and ft is the chamfering height of the tooth profile on the gear end face.

[0024] Preferably, the selection range of the tool helix angle β in Step 5 is 15° to 60°, the selection range of the flank relief angle αe of the tool top edge in Step 5 is 8° to 15°, and the calculation formula for the inclination angle γ of the tool rake face is: γ = 90° - β (3).

[0025] Preferably, the tool edge curve in Step 6 is calculated based on the single-degree-of-freedom point-contact gear cutting meshing condition, that is: when the tool performs cutting at the correct position, the rotational movement between the tool and the gear only needs to satisfy the relationship φ2 = i21 * φ1, and the tool does not need to additionally perform a cutting movement along the gear axis. Among them, φ1 is the rotational angle of the gear, φ2 is the rotational angle of the tool, and the two satisfy the relationship φ2 = i21 * φ1, and i21 is the tooth number ratio between the gear and the tool.

[0026] Preferably, when calculating the tool edge curve in Step 6, any point on the gear end face tooth profile and the corresponding point on the tool edge need to satisfy the following relationship:

[0027]

[0028] where, (x1(u), y1(u), z1(u)) is the coordinate of any point on the gear end face tooth profile, and (x2, y2, 0) is the coordinate of the corresponding point on the tool edge.

[0029] The matrix transformation relationship between the tool coordinate system and the gear coordinate system is:

[0030]

[0031] Among them, φ1 is the rotation angle of the gear, φ2 is the rotation angle of the tool, a is the horizontal distance of the tool center relative to the gear center along the X-axis direction, h is the vertical distance of the tool center relative to the gear end face, and Σ is the shaft intersection angle between the tool rotation axis and the gear rotation axis.

[0032] Substituting formula (5) into formula (4), we can obtain

[0033]

[0034] By sequentially giving the coordinate points (x1(u), y1(u), z1(u)) on the tooth profile of the gear end face, the rotation angle φ1(u) of the gear can be solved from formula (6), and then from φ2 = i21 * φ1(u), substituting into the formula

[0035]

[0036] Finally, the set of coordinate points [x2, y2] of the cutting edge line corresponding to the coordinate points on the tooth profile of the gear end face is obtained. Connecting all the coordinate points of the cutting edge line in sequence to form a curve, the edge shape of the chamfering tool can be obtained.

[0037] Preferably, the final diameter of the tool in step 7 refers to the maximum outer diameter of the edge shape of the chamfering tool along the radial direction, which is calculated by the formula.

[0038] Preferably, the final installation parameters of the tool in step 8 include: the horizontal distance a of the tool center relative to the gear center along the X-axis direction, the vertical distance h of the tool center relative to the gear end face, the shaft intersection angle Σ between the tool rotation axis and the gear rotation axis, and the horizontal distance c of the tool center relative to the gear center along the Y-axis direction, where c is calculated by the formula.

[0039] (III) Beneficial effects

[0040] The present invention provides a chamfering tool for the tooth profile of the gear end face with a disk-shaped helical tooth edge structure and its design method. It has the following beneficial effects:

[0041] 1. The present invention designs the chamfering tool based on the single-degree-of-freedom point-contact tooth cutting meshing condition, and the precise edge shape of the chamfering tool can be calculated according to the chamfering amount of the gear end face.

[0042] 2. For the left and right tooth profiles of the gear end face, the chamfering tools for the left tooth profile and the right tooth profile are designed respectively. The tool adopts an installation form with a large shaft intersection angle, so that the inclination angle symmetry of the chamfering of the two sides of the gear is better, and the cutting edge sweeping surfaces at the lower end faces of the tooth profile chamfering are flush.

[0043] 3. The number of cutter teeth of the rolling edge cutter designed by the present invention is 6 to 10 times that of the traditional rolling edge cutter, and the service life of the cutter is longer. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 FIG. is a flowchart of a gear end face tooth profile chamfering cutter with a disc-shaped helical blade structure and its design method proposed by the present invention;

[0045] Figure 2 FIG. is an installation schematic diagram of a gear end face tooth profile chamfering cutter with a disc-shaped helical blade structure proposed by the present invention;

[0046] Figure 3 FIG. is a blade profile curve diagram of a gear end face tooth profile chamfering cutter with a disc-shaped helical blade structure proposed by the present invention;

[0047] Figure 4 FIG. is a right tooth profile chamfering cutter blade profile curve diagram of a gear end face tooth profile chamfering cutter with a disc-shaped helical blade structure proposed by the present invention;

[0048] Figure 5 FIG. is a structural schematic diagram of a gear end face tooth profile chamfering cutter with a disc-shaped helical blade structure proposed by the present invention;

[0049] Figure 6 FIG. is another direction structural schematic diagram of a gear end face tooth profile chamfering cutter with a disc-shaped helical blade structure proposed by the present invention;

[0050] Figure 7 FIG. is a schematic diagram of the installation of a gear end face tooth profile chamfering cutter with a disc-shaped helical blade structure proposed by the present invention on a machine tool.

[0051] Among them, 1. Gear body; 2. Left gear rolling edge cutter; 3. Right gear rolling edge cutter; 301. Front tool face; 302. Rear tool face; 303. Cutting edge. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0052] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0053] Embodiment:

[0054] As Figure 1-7 shown, the embodiment of the present invention provides a design method for a gear end face tooth profile chamfering cutter with a disc-shaped helical blade structure, including the following steps:

[0055] Step 1: Given the parameters of the gear 1 to be machined, and the chamfer height of the end face profile of gear 1 is given.

[0056] The gear 1 to be machined is an external helical gear with involute tooth profile, the number of teeth zw = 80, the module mn = 3 mm, the pressure angle αn = 20°, the helix angle βw = 30° (right-handed), the addendum circle diameter da = 283.2 mm, the dedendum circle diameter df = 269.2 mm, and the modification coefficient xn = 0 mm;

[0057] The chamfer height ft of the end face profile of gear 1 is 1 mm;

[0058] The end face profile of gear 1 is evenly divided into the left tooth profile 101 and the right tooth profile 102 along the symmetric center of the tooth groove.

[0059] Step 2: Initially determine the tool diameter.

[0060] For the left tooth profile 101 of the end face of gear 1, the diameter D0L of the left tooth profile chamfering tool 2 is initially determined to be 110 mm;

[0061] For the right tooth profile 102 of the end face of gear 1, the diameter D0R of the right tooth profile chamfering tool 3 is initially determined to be 110 mm.

[0062] Step 3: Select the tool installation angle parameters.

[0063] For the left tooth profile 101 of the end face of gear 1, determine the angle ηL = 45° between the connection line of the rotation center of the left tooth profile chamfering tool 2 and the symmetric center of the gear tooth groove and the horizontal line, and the installation shaft intersection angle ΣL = 45°;

[0064] For the right tooth profile 102 of the end face of gear 1, determine the angle ηR = 30° between the connection line of the rotation center of the right tooth profile chamfering tool 3 and the symmetric center of the gear tooth groove and the horizontal line, and the installation shaft intersection angle ΣR = -45°.

[0065] Step 4: Calculate the tool installation position parameters.

[0066] As Figure 2 , it is a schematic diagram of the chamfering tool installation parameters. The horizontal distance a of the tool center relative to the gear center along the X-axis and the vertical distance h of the tool center relative to the gear end face are calculated according to the formulas and respectively, where D0 is the initial diameter of the chamfering tool, η is the angle between the connection line of the tool center and the symmetric center of the gear tooth groove and the vertical line, df is the dedendum circle diameter of the gear, and ft is the chamfer height of the end face profile of the gear.

[0067] For the left tooth profile 101 of the end face of gear 1, the horizontal distance aL of the center of the left tooth profile chamfering tool 2 relative to the gear axis is 173.49 mm, and the vertical distance hL of the tool center relative to the gear end face is 37.89 mm;

[0068] For the right tooth profile 102 of the end face of gear 1, the horizontal distance aL from the center of the right tooth profile chamfering tool 3 to the gear axis is 162.10 mm, and the vertical distance hL from the tool center to the gear end face is 46.63 mm.

[0069] Step 5: Design the geometric structure parameters of the tool, specifically including: the number of tool teeth, the tool helix angle, the back angle of the tool top edge, and the inclination angle of the tool rake face.

[0070] For the left tooth profile 101 of the end face of gear 1, determine that the number of teeth zL of the left tooth profile chamfering tool 2 is 39, the tool helix angle βL is 40° (left-handed), the back angle αeL of the tool top edge is 15°, and the inclination angle γL of the tool rake face is calculated by the formula γ = 90° - β to be 50°;

[0071] For the right tooth profile 102 of the end face of gear 1, determine that the number of teeth zR of the right tooth profile chamfering tool 3 is 25, the tool helix angle βR is 30° (right-handed), the back angle αeR of the tool top edge is 15°, and the inclination angle γR of the tool rake face is calculated by the formula γ = 90° - β to be 60°.

[0072] Step 6: Calculate the tool edge curve. Divide the tooth profile of the gear end face evenly into the left tooth profile and the right tooth profile along the symmetric center of the tooth groove. Select the tool parameters and tool installation parameters in sequence according to Steps 2 to 5. (x1(u), y1(u), z1(u)) represents the coordinates of any point on the tooth profile of the gear end face, and (x2, y2, 0) represents the coordinates of the corresponding point on the tool edge. From the formula The single-degree-of-freedom point-contact gear cutting meshing condition can be derived Among them, the spatial coordinate transformation matrix is φ1 is the rotation angle of the gear, φ2 is the rotation angle of the tool, a is the horizontal distance from the tool center to the gear center along the X-axis direction, h is the vertical distance from the tool center to the gear end face, and Σ is the shaft intersection angle between the tool rotation axis and the gear rotation axis.

[0073] Given the coordinate points (x1(u), y1(u), z1(u)) on the tooth profile of the gear end face in sequence, from the formula The rotation angle φ1(u) of the gear can be solved, and then from the relationship between the rotational speeds of the tool and the gear φ2 = i21 * φ1(u), substitute φ1(u) and φ2 = i21 * φ1(u) into the formula Finally, the set [x2, y2] of the coordinate points of the tool edge corresponding to the coordinate points on the tooth profile of the gear end face is obtained. Connect all the coordinate points of the tool edge in sequence to form a curve, and the chamfering tool edge curves of the left tooth profile and the right tooth profile can be obtained, as Figure 3 is the chamfering tool edge curve of the left tooth profile, as Figure 4It is the edge curve of the chamfering tool for the right tooth profile.

[0074] Step 7: From the formula The final diameters of the rolling chamfering tools for the left and right tooth profiles are calculated respectively to be D1 L = 111.8 mm and D1 R = 112.3 mm.

[0075] Step 8: From the formula The horizontal distances of the centers of the rolling chamfering tool 2 for the left tooth profile 101 and the rolling chamfering tool 3 for the right tooth profile 102 relative to the gear center along the Y-axis direction are calculated respectively to be cL = 3.05 mm and cR = 5.84 mm.

[0076] As Figure 3 , it is the edge curve of the chamfering tool 2 for the left tooth profile designed by the method of the present invention. As Figure 4 , it is the edge curve of the chamfering tool 3 for the right tooth profile designed by the method of the present invention. The method of the present invention is a rolling chamfering tool designed based on the single-degree-of-freedom point-contact gear cutting meshing condition, which belongs to an analytical method. The edge shape of the rolling chamfering tool can be directly calculated from the chamfer amount on the gear end face, with higher calculation efficiency and no theoretical error in the tool edge shape.

[0077] As Figure 5 It is the chamfering tool 3 for the left tooth profile designed by the method of the present invention. The outer shape of the tool is a disk-shaped multi-edge inclined tooth structure; the structure of the tool includes a rake face 301, a flank 302, and a cutting edge 303; the structural parameters of the tool include the number of teeth, the helix angle of the tool, the inclination angle of the rake face, and the back angle of the top edge; the rake face 301 of the tool is a normal plane perpendicular to the helix direction of the tool; the flank 302 of the tool is a helical surface; the axial section of the tool is obtained by solving based on the single-degree-of-freedom point-contact gear cutting meshing condition; the cutting edge 303 of the tool is the intersection line of the rake face and the flank. Compared with the traditional rolling chamfering tool with 4 to 6 teeth, the number of teeth of the rolling chamfering tool designed by the present invention is 39 teeth and 25 teeth respectively, which is 4 to 9 times the number of teeth of the traditional rolling chamfering tool, and the tool service life is longer.

[0078] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A design method for a chamfering tool for the tooth profile of the end face of a gear with a disc-shaped helical tooth blade structure, characterized in that: It includes the following steps: Step 1: Given the gear parameters and the chamfer height of the gear end face tooth profile; Step 2: Initially determine the tool diameter; Step 3: Select the tool installation angle parameters; Step 4: Calculate the tool installation position parameters; Step 5: Design the tool geometric structure parameters; Step 6: Divide the gear end face tooth profile evenly into the left tooth profile and the right tooth profile along the symmetric center of the tooth groove. According to Steps 2 to 5, select the tool parameters and tool installation parameters in sequence, and calculate the edge rolling tool edge profile curves of the left tooth profile and the right tooth profile of the gear end face respectively; When calculating the tool edge profile curve, it is necessary to make any point on the gear end face tooth profile satisfy the following relationship with the corresponding point on the tool edge: where, (x1(u), y1(u), z1(u)) is the coordinate of any point on the gear end face tooth profile, and (x2, y2, 0) is the coordinate of the corresponding point on the tool edge; The matrix transformation relationship between the tool coordinate system and the gear coordinate system is: wherein, φ1 is the rotation angle of the gear, φ2 is the rotation angle of the cutting tool, a is the horizontal distance of the cutting tool center relative to the gear center along the X-axis direction, h is the vertical distance of the cutting tool center relative to the gear end face, and Σ is the shaft intersection angle between the cutting tool rotation axis and the gear rotation axis; Substituting formula (5) into formula (4), we can get Given the coordinate points (x1(u), y1(u), z1(u)) on the gear end face tooth profile in sequence, the rotation angle φ1(u) of the gear can be solved from formula (6), and then φ2 = i21 * φ1(u), where i21 is the tooth number ratio of the gear to the tool, and substituting it into the formula Finally, obtain the set [x2, y2] of the edge line coordinate points corresponding to the coordinate points on the gear end face tooth profile. Connect all the edge line coordinate points in sequence to form a curve, and the edge rolling tool edge profile can be obtained; Step 7: Calculate the final diameters of the edge rolling tools for the left tooth profile and the right tooth profile respectively. The final diameter refers to the maximum outer diameter of the edge profile of the edge rolling tool along the radial direction; The final diameters of the hobbing cutters for the left and right tooth profiles are calculated respectively by the formula ​ where x2(k) is any coordinate point in the x direction of the edge rolling tool tooth profile, and y2(k) is any coordinate point in the y direction of the edge rolling tool tooth profile; Step 8: Calculate the horizontal distances of the centers of the edge rolling tools for the left tooth profile and the right tooth profile relative to the gear center along the Y-axis direction respectively; From the formula Calculate respectively the horizontal distances of the center of the chamfering tool of the left tooth profile and the right tooth profile relative to the center of the gear along the Y-axis direction, and then obtain the final installation parameters of the tool; where y2(1) is the first coordinate point in the y direction of the edge rolling tool tooth profile, and y2(end) is the last coordinate point in the y direction of the edge rolling tool tooth profile.

2. The design method of a gear end face tooth profile chamfering tool with a disc-shaped helical cutting edge structure according to claim 1, characterized in that: The angle parameters in Step 3 specifically include: the angle between the connection line of the tool rotation center and the symmetric center of the workpiece tooth groove and the horizontal line, and the tool installation axis intersection angle. The selection range of the angle η between the connection line of the tool rotation center and the symmetric center of the workpiece tooth groove and the horizontal line in Step 3 is 30° to 50°, and the selection range of the axis intersection angle Σ between the tool and the workpiece in Step 3 is -60 to 60°; 3. The design method of a chamfering tool for the end face tooth profile of a gear with a disc-shaped helical cutting edge structure according to claim 1, characterized in that: The position parameters in Step 4 specifically include: the horizontal distance of the tool center relative to the gear center along the X-axis direction, the vertical distance of the tool center relative to the gear end face, the horizontal distance of the tool center relative to the gear center along the X-axis direction, and the vertical distance of the tool center relative to the gear end face are calculated according to formula (1) and formula (2) respectively: where, D0 is the initial diameter of the chamfering tool, η is the angle between the connection line of the tool center and the symmetric center of the gear tooth groove and the vertical line, df is the gear root circle diameter, and ft is the chamfer height of the gear end face tooth profile.

4. The design method of a chamfering tool for the end face tooth profile of a gear with a disc-shaped helical cutting edge structure according to claim 1, characterized in that: The structural parameters in step 5 specifically include: the number of teeth of the cutting tool, the helix angle of the cutting tool, the back angle of the top edge of the cutting tool, and the inclination angle of the rake face of the cutting tool. The selection range of the helix angle β of the cutting tool is 15° to 60°. The selection range of the back angle αe of the top edge of the cutting tool in step 5 is 8° to 15°. The calculation formula for the inclination angle γ of the rake face of the cutting tool in step 5 is: γ = 90° - β (3).

5. The design method of a gear end face tooth profile chamfering tool with a disc-shaped helical cutting edge structure according to claim 1, characterized in that: The cutting edge curve of the cutting tool in step 6 is calculated based on the single-degree-of-freedom point-contact gear cutting meshing condition, that is: when the cutting tool performs cutting at the correct position, the rotational movement between the cutting tool and the gear only needs to satisfy the relationship φ2 = i21 * φ1, and the cutting tool does not need to add additional cutting movement along the axial direction of the gear. Among them, φ1 is the rotational angle of the gear, φ2 is the rotational angle of the cutting tool, and the two satisfy the relationship φ2 = i21 * φ1.

6. The design method of a chamfering tool for the gear end face tooth profile of a disc-shaped helical cutting edge structure according to claim 1, characterized in that: The final installation parameters of the cutting tool in step 8 include: the horizontal distance a of the cutting tool center relative to the gear center along the X-axis, the vertical distance h of the cutting tool center relative to the gear end face, the shaft intersection angle Σ between the rotational axis of the cutting tool and the rotational axis of the gear, and the horizontal distance c of the cutting tool center relative to the gear center along the Y-axis. Among them, c is calculated by the formula.

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