Process for machining a gear for one-way engagement

Abstract

The present application relates to a kind of gear machining process for one-way engagement.The present application includes S1, blanking: providing blank;The blank is annealed;Carry out shot blasting treatment;Phosphorus saponification surface treatment is carried out to facilitate surface lubrication;By the plastic deformation mode of extrusion material, form two connected cylinders of different sizes;Cold extrusion after the blank of shrinkage diameter is carried out cold extrusion flat processing;Preform outer circle spline extension initial step;Carry out recrystallization annealing treatment;Carry out shot blasting treatment;Phosphorus saponification surface treatment is carried out;One-time extrusion forming inner hole ratchet tooth, outer circle involute gear and involute straight spline;The workpiece after extrusion forming is turned;The workpiece after turning is treated by heat treatment carburizing quenching;The workpiece after carburizing quenching is treated by tempering;Carry out shot blasting treatment.The present application improves the single-tooth strength of inner hole ratchet tooth and outer circle involute gear, and can greatly improve production efficiency and reduce production cost.

Description

Technical Field

[0001] This invention relates to the field of gear processing technology, and in particular to a gear processing technology for unidirectional meshing. Background Technology

[0002] Gears are important transmission components in mechanical devices, and they are widely used in various mechanical transmissions. (Refer to...) Figure 1 As shown, this is a gear used for one-way meshing in a transmission device. The outer circle is provided with an outer involute spur gear 1 and an involute straight spline 2, and the inner hole is provided with an inner ratchet tooth 3 for one-way transmission. Its main technical requirements are: the coaxiality between the inner ratchet tooth 3 and the outer involute gear 1 and the involute straight spline 2 is not greater than 0.05 mm; when the gear is subjected to 1000 impacts during emergency stops, the inner ratchet tooth and the outer involute gear will not break or fracture.

[0003] Traditional machining process: precision forging - turning - hobbing of internal ratchet teeth - hobbing (tooth part adopts hobbing process) - tooth rolling (machining external involute straight spline) - heat treatment carburizing and quenching - tempering - surface treatment.

[0004] However, under the aforementioned traditional process, it is difficult to ensure that the coaxiality of the ratchet teeth in the inner bore of the gear, the involute gear, and the involute spline is within 0.05. Furthermore, when the gear is subjected to impact after 1000 sudden stops, failures such as chipping or breakage of the ratchet teeth or the outer gear are prone to occur. In addition, the process is complex, has low production efficiency, and high production costs.

[0005] Therefore, there is an urgent need for a unidirectional meshing gear machining process with higher machining accuracy, better single tooth strength, and simplified process to improve the overall performance and production efficiency of gears. Summary of the Invention

[0006] Therefore, the present invention provides a gear machining process for unidirectional meshing, which improves the single tooth strength of internal ratchet teeth and external involute gears, and can significantly improve production efficiency and reduce production costs.

[0007] To solve the above-mentioned technical problems, the present invention provides a gear machining process for one-way meshing, comprising the following steps: S1. Blanking: Provide a smooth, cylindrical blank; S2. Annealing: The blank is annealed to soften the metal; S3. First shot blasting: The annealed blank is shot blasted to remove residual substances on the surface; S4. Primary surface treatment: Phosphate saponification surface treatment is performed on the blank after shot blasting to promote surface lubrication. S5. Cold extrusion necking: The surface-treated blank is plastically deformed by extrusion to form two connected cylinders of different sizes. S6. Cold extrusion flattening: The blank after cold extrusion and diameter reduction is flattened by cold extrusion, and the material is plastically deformed again to compress its length and expand its diameter. S7. Turning end face and large outer circle: Turning to remove the rounded corners at the large outer circle and pre-forming the initial step of the outer circle spline extension; S8. Recrystallization Annealing: The turned blank is subjected to recrystallization annealing treatment. S9. Second shot blasting: Shot blasting is performed on the blank after recrystallization annealing to remove residual substances on the surface. S10, Secondary Surface Treatment: A second phosphating saponification surface treatment is performed to promote surface lubrication; S11. Extrusion forming of internal and external teeth: One-time extrusion forming of internal hole ratchet teeth, external involute gears and involute straight splines; S12. Turning: Turning the extruded workpiece to achieve the shape and size required by the drawing. S13. Heat Treatment: Carburizing and Quenching: Place the machined workpieces neatly on the rack, maintaining a spacing of 6-8 mm between them. Then, send the rack into the carburizing furnace, heat it to 890℃-910℃, and control the carbon potential in the furnace at 0.9-1. Carburize for 2-2.5 hours to form a 0.4-0.6 mm carburized layer on the workpiece surface. After carburizing, continue diffusion treatment in the furnace for 45-50 minutes to ensure that the carbon concentration of the carburized layer decreases in a stepwise manner from the surface to the core, preventing excessive carbon concentration on the gear surface from causing gear breakage. After diffusion treatment, lower the furnace temperature to 830℃-850℃, and then quickly remove the workpieces for quenching. Immerse them in quenching oil at 80℃-90℃ for cooling. S14. Tempering: Tempering is performed on the workpiece after carburizing and quenching. The workpiece is moved into a tempering furnace and tempered at a temperature of 180℃~200℃ for 80~100 minutes to eliminate residual stress. S15. Third shot blasting: Shot blasting is performed on the tempered workpiece to clean the surface and improve the bending fatigue strength of the tooth root.

[0008] In one embodiment of the present invention, in step S1, the blank material is 20CrMnTi alloy steel.

[0009] In one embodiment of the present invention, in step S2, during the annealing process, the blank is heated to 870°C~890°C and held for 8 hours, then cooled in the furnace to 360°C~380°C. After the annealing process, the hardness of the blank is HRB65~80.

[0010] In one embodiment of the present invention, the phosphating surface treatment process in step S4 or step S10 is as follows: First, the workpiece to be treated is degreased using a 5%~10% phosphorus-free degreaser or a 1%~2% water-based cleaning agent. The treatment temperature is 50℃~70℃ and the treatment time is 8~10 minutes to remove oil and impurities from the surface of the workpiece. The free alkalinity is controlled at 30~50 points and the pH value is 12~14. After degreasing, the workpiece is rinsed three times with tap water, each time at a room temperature of 20℃~25℃ for 1~2 minutes to clean the workpiece surface, and the pH value of each cold water rinse is controlled at 6~9. Use tap water for a hot wash at a temperature of 60℃~70℃ for 1~2 minutes, with the pH value controlled at 6~9. Phosphating treatment is performed using PB~513A zinc-based coating agent at a mass ratio of 30%~35%. The treatment temperature is controlled at 70℃~80℃, and the treatment time is 20~25 minutes. The control parameters include: total acidity of 90~140 points when setting up the tank, free acidity of 12~21 points when setting up the tank, acid ratio of 6.5~9, and iron content of less than or equal to 4 g / L. After the phosphating treatment is completed, rinse again with tap water at room temperature (20℃~25℃) for 1~2 minutes, keeping the pH value between 6 and 9, to remove excess phosphating residue. Perform a second hot water wash at a temperature greater than or equal to 75℃ for 1 to 2 minutes, with the pH value controlled between 7.5 and 9. Finally, saponification is performed using LUB-601 lubricant at a mass ratio of 3% to 5%, at a temperature of 65℃ to 75℃, for 5 to 6 minutes, with free alkalinity controlled at 3 to 7 points and pH value of 8.5 to 9.5.

[0011] In step S8, during recrystallization annealing, the machined blank is heated to 850℃~870℃ and held for 6~8 hours. Then, it is cooled to below 460℃ at a rate of 20℃ per hour and air-cooled to achieve a hardness of HRB60~75.

[0012] In one embodiment of the present invention, in step S11, the coaxiality between the inner bore ratchet teeth, the outer circular involute gear, and the involute straight spline is no greater than 0.03 mm.

[0013] In one embodiment of the present invention, in step S13, after heat treatment carburizing and quenching, the surface hardness of the workpiece reaches HV. 0.1 710 and above, with a core hardness of HRC40~45.

[0014] In one embodiment of the present invention, in step S14, after tempering, the surface hardness of the workpiece reaches HV. 0.1 A score of 700 or higher, with a core hardness of HRC38~43.

[0015] In one embodiment of the present invention, in step S14, after tempering, the coaxiality between the inner hole ratchet teeth, the outer circle involute gear, and the involute straight spline of the workpiece is not greater than 0.05 mm.

[0016] In one embodiment of the present invention, in step S3, the shot blasting process lasts for 8 to 12 minutes; in step S9, the shot blasting process lasts for 5 to 10 minutes; and in step S15, the shot blasting process lasts for 8 to 10 minutes.

[0017] The technical solution of the present invention has the following advantages compared with the prior art: This invention discloses a new processing technology for unidirectional meshing gears, employing the following steps: blanking (20CrMnTi round billet) - annealing - first shot blasting - first surface treatment - cold extrusion for diameter reduction - cold extrusion for flattening - turning the end face and large outer diameter - recrystallization annealing - second shot blasting - second surface treatment - extrusion forming of internal and external teeth - turning - heat treatment (carburizing and quenching) - tempering - third shot blasting. Due to the three-stage extrusion metal plastic forming process, the material's grain structure is more compact. The metal fiber flow lines of the inner ratchet teeth and the outer involute tooth profile are continuously connected to the center. After carburizing, quenching, tempering, surface treatment, and shot blasting, the surface hardness is high, and the core toughness is good, improving the single-tooth strength of the inner ratchet teeth and the outer involute gear. This ensures that the inner ratchet teeth and the outer involute gear do not chip or break after 1000 impacts during a sudden stop. This process not only guarantees product quality but also significantly improves production efficiency, reducing production costs by at least 30% compared to existing technologies.

[0018] This invention uses high-quality alloy steel. After cold extrusion to reduce diameter, cold extrusion to flatten, and machining a pre-formed blank in one pass, it is then extruded in one pass to form the inner hole ratchet teeth, the outer circle involute gear, and the involute straight spline. This eliminates the errors caused by the conversion of the original machining process reference and the secondary clamping, and ensures that the coaxiality of the inner hole ratchet teeth and the outer circle involute gear and involute straight spline reaches 0.05. Attached Figure Description

[0019] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0020] Figure 1 This is a front view of the gear of the present invention.

[0021] Figure 2 This is a side view of the gear of the present invention.

[0022] Figure 3 This is a diagram showing the gear machining and blanking process of the present invention.

[0023] Figure 4 This is a schematic diagram of the cold extrusion diameter reduction forming structure of the present invention.

[0024] Figure 5 This is a schematic diagram of the cold extrusion flattening forming structure of the present invention.

[0025] Figure 6 This is a schematic diagram of the end face and large outer circle forming structure of the present invention.

[0026] Figure 7 This is a schematic diagram of the internal and external tooth forming structure of the present invention.

[0027] Figure 8 This is a schematic diagram comparing the streamlines of metal fibers produced by internal ratchet teeth hobbing with those produced by cold extrusion forming.

[0028] Figure 9 This is a schematic diagram comparing the streamlines of metal fibers formed by hobbing external involute gears with those formed by cold extrusion. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0030] In this invention, when directions (up, down, left, right, front, and back) are described, it is only for the convenience of describing the technical solution of this invention, and does not indicate or imply that the technical features referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0031] In this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc., are understood to exclude the stated number; "above," "below," "within," etc., are understood to include the stated number. In the description of this invention, the terms "first" and "second" are used only to distinguish technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of the indicated technical features.

[0032] In this invention, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; a fixed connection, a detachable connection, or an integrally formed connection; a mechanical connection, an electrical connection, or a connection capable of mutual communication; or the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this invention based on the specific content of the technical solution.

[0033] Reference Figure 1 As shown, this embodiment provides a gear machining process for unidirectional meshing, including the following steps: S1. Blanking: Provide a smooth, cylindrical blank. (Refer to...) Figure 3 As shown.

[0034] In this embodiment, the blank material is 20CrMnTi alloy steel, which has high strength and toughness, good hardenability, and a hard surface after carburizing, quenching and tempering, and good core toughness.

[0035] S2. Annealing: The blank is annealed to soften the metal. During annealing, the blank is heated to 870℃~890℃ and held for 8 hours, then cooled in the furnace to 360℃~380℃. After annealing, the hardness of the blank is HRB65~80.

[0036] S3. First shot blasting: The annealed blank is shot blasted for 8 to 12 minutes to remove surface residues such as oxide scale.

[0037] S4. Primary Surface Treatment: The shot-blasted blank undergoes a phosphating surface treatment to promote surface lubrication. The phosphating surface treatment process is as follows: First, the workpiece to be treated is degreased using a 5%~10% phosphorus-free degreaser or a 1%~2% water-based cleaning agent. The treatment temperature is 50℃~70℃ and the treatment time is 8~10 minutes to remove oil and impurities from the surface of the workpiece. The free alkalinity is controlled at 30~50 points and the pH value is 12~14. After degreasing, the workpiece is rinsed three times with tap water, each time at a room temperature of 20℃~25℃ for 1~2 minutes to clean the workpiece surface, and the pH value of each cold water rinse is controlled at 6~9. Use tap water for a hot wash at a temperature of 60℃~70℃ for 1~2 minutes, with the pH value controlled at 6~9. Phosphating treatment is performed using PB~513A zinc-based coating agent at a mass ratio of 30%~35%. The treatment temperature is controlled at 70℃~80℃, and the treatment time is 20~25 minutes. The control parameters include: total acidity of 90~140 points when setting up the tank, free acidity of 12~21 points when setting up the tank, acid ratio (total acidity / free acidity) controlled at 6.5~9, and iron content less than or equal to 4 g / L. After the phosphating treatment is completed, rinse again with tap water at room temperature (20℃~25℃) for 1~2 minutes, keeping the pH value between 6 and 9, to remove excess phosphating residue. Perform a second hot water wash at a temperature greater than or equal to 75℃ for 1 to 2 minutes, with the pH value controlled between 7.5 and 9. Finally, saponification is performed using LUB-601 lubricant at a mass ratio of 3% to 5%, at a temperature of 65℃ to 75℃, for 5 to 6 minutes, with free alkalinity controlled at 3 to 7 points and pH value of 8.5 to 9.5.

[0038] The technical parameters for solution control in the phosphating surface treatment process are shown in Table 1.

[0039] Table 1: Technical Parameters for Solution Control in Phosphate Saponification Surface Treatment Process

[0040] S5. Cold extrusion necking: A surface-treated blank is plastically deformed by extrusion (using a hydraulic press) to form two connected cylinders of unequal size; see reference. Figure 4 As shown.

[0041] S6. Cold Extrusion Flattening: The blank after cold extrusion and diameter reduction is flattened using a hydraulic press, causing the material to undergo plastic deformation again, compressing its length and expanding its diameter; see reference. Figure 5 As shown.

[0042] S7. Turning the end face and large outer circle: Turn away the rounded corner at point a on the large outer circle, and after turning both sides of the end face, pre-form the initial step b of the outer circle spline extension in the middle of the end face; refer to Figure 5 , Figure 6 As shown.

[0043] S8. Recrystallization Annealing: The machined blank is subjected to recrystallization annealing treatment. During recrystallization annealing, the machined blank is heated to 850℃~870℃ and held for 6~8 hours. Then, it is cooled to below 460℃ at a rate of 20℃ per hour and air-cooled to make the hardness of the machined blank reach HRB60~75.

[0044] S9. Second shot blasting: The blank after recrystallization annealing is shot blasted for 5 to 10 minutes to remove residual substances such as oxide scale from the surface again.

[0045] S10, Secondary Surface Treatment: A second phosphating saponification surface treatment is performed to promote surface lubrication. The technical parameters for solution control during the phosphating saponification surface treatment process are the same as those in Table 1 (i.e., step S4).

[0046] S11, Extrusion forming of internal and external teeth: One-time extrusion forming of internal ratchet teeth 3, external involute gear 1, and involute straight spline 2. The coaxiality among internal ratchet teeth 3, external involute gear 1, and involute straight spline 2 is not greater than 0.03 mm.

[0047] S12. Turning: Turning the extruded workpiece to achieve the shape and size required by the drawing. S13. Heat Treatment: Carburizing and Quenching: Place the machined workpieces neatly on the rack, maintaining a spacing of 6-8 mm between them. Then, send the rack into the carburizing furnace and heat it to 890℃-910℃, controlling the carbon potential in the furnace at 0.9-1. Carburize for 2-2.5 hours to form a 0.4-0.6 mm carburized layer on the workpiece surface. After carburizing, continue diffusion treatment in the furnace for 45-50 minutes to ensure that the carbon concentration of the carburized layer decreases in a stepwise manner from the surface to the core, preventing excessive carbon concentration on the gear surface from causing gear breakage. After diffusion treatment, lower the furnace temperature to 830℃-850℃, then quickly remove the workpieces for quenching and immerse them in quenching oil at 80℃-90℃ for cooling.

[0048] After heat treatment, carburizing and quenching, the surface hardness of the workpiece reaches HV. 0.1 710 and above, with a core hardness of HRC40~45.

[0049] S14. Tempering: Tempering is performed on the workpiece after carburizing and quenching. The workpiece is placed in a tempering furnace and tempered at 180℃~200℃ for 80~100 minutes to eliminate residual stress. After tempering, the surface hardness of the workpiece reaches HV. 0.1 The surface hardness is 700 or higher (0.1mm depth hardness is 700), and the core hardness is HRC38~43; the coaxiality between the inner hole ratchet teeth, the outer circle involute gear and the involute straight spline of the workpiece is not greater than 0.05 mm.

[0050] S15. Triple shot blasting: The tempered workpiece undergoes shot blasting for 8-10 minutes to clean the surface and improve the bending fatigue strength of the gear roots. See the image for the final gear. Figure 1 , Figure 2 As shown.

[0051] Figure 8A comparison is shown between the internal ratchet tooth hobbing metal fiber streamline 4 (using existing technology) and the cold extruded metal fiber streamline 3 obtained using the above-mentioned technology. Figure 9 The comparison between the metal fiber streamlines 6 obtained by hobbing the outer involute gear and the cold-extruded metal fiber streamlines 5 obtained by the above process is shown. It can be seen that the metal fiber streamlines obtained by the above process exhibit continuous, smooth characteristics and are consistent with the contour of the part, maintaining the continuity and density of the material itself. Due to the use of three-stage extrusion metal plastic forming, the material's grain structure is more dense, and the metal fiber streamlines of the inner ratchet teeth and the outer involute tooth profile are continuously connected to the center. After carburizing, quenching, tempering, surface treatment, and shot blasting, the surface hardness is high, and the core toughness is good, improving the single-tooth strength of the inner ratchet teeth and the outer involute gear. This ensures that the inner ratchet teeth and the outer involute gear do not chip or break when subjected to 1000 impacts during a sudden stop.

[0052] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A gear machining process for unidirectional meshing, characterized in that, Includes the following steps: S1. Blanking: Provide a smooth, cylindrical blank; S2. Annealing: The blank is annealed to soften the metal; S3. First shot blasting: The annealed blank is shot blasted to remove residual substances on the surface; S4. Primary surface treatment: Phosphate saponification surface treatment is performed on the blank after shot blasting to promote surface lubrication. S5. Cold extrusion necking: The surface-treated blank is plastically deformed by extrusion to form two connected cylinders of different sizes. S6. Cold extrusion flattening: The blank after cold extrusion and diameter reduction is flattened by cold extrusion, and the material is plastically deformed again to compress its length and expand its diameter. S7. Turning end face and large outer circle: Turning to remove the rounded corner at the large outer circle and pre-forming the initial step of the outer circle spline extension; S8. Recrystallization Annealing: The turned blank is subjected to recrystallization annealing treatment. S9. Second shot blasting: Shot blasting is performed on the blank after recrystallization annealing to remove residual substances on the surface. S10, Secondary Surface Treatment: A second phosphating saponification surface treatment is performed to promote surface lubrication; S11, Extrusion forming of internal and external teeth: One-time extrusion forming of internal hole ratchet teeth, external circle involute gears and involute straight splines; S12. Turning: Turning the extruded workpiece to achieve the shape and size required by the drawing. S13. Heat Treatment: Carburizing and Quenching: Place the machined workpieces neatly on the rack, maintaining a spacing of 6-8 mm between them. Then, send the rack into the carburizing furnace, heat it to 890℃-910℃, and control the carbon potential in the furnace at 0.9-1. Carburize for 2-2.5 hours to form a 0.4-0.6 mm carburized layer on the workpiece surface. After carburizing, continue diffusion treatment in the furnace for 45-50 minutes to ensure that the carbon concentration of the carburized layer decreases in a stepwise manner from the surface to the core, preventing excessive carbon concentration on the gear surface from causing gear breakage. After diffusion treatment, lower the furnace temperature to 830℃-850℃, and then quickly remove the workpieces for quenching. Immerse them in quenching oil at 80℃-90℃ for cooling. S14. Tempering: Tempering is performed on the workpiece after carburizing and quenching. The workpiece is moved into a tempering furnace and tempered at a temperature of 180℃~200℃ for 80~100 minutes to eliminate residual stress. S15. Third shot blasting: Shot blasting is performed on the tempered workpiece to clean the surface and improve the bending fatigue strength of the tooth root. In step S8, during recrystallization annealing, the machined blank is heated to 850℃~870℃ and held for 6~8 hours. Then, it is cooled to below 460℃ at a rate of 20℃ per hour and air-cooled to achieve a hardness of HRB60~75.

2. The gear machining process for unidirectional meshing according to claim 1, characterized in that, In step S1, the blank material is 20CrMnTi alloy steel.

3. The gear machining process for unidirectional meshing according to claim 1, characterized in that, In step S2, during the annealing process, the blank is heated to 870℃~890℃ and held for 8 hours, then cooled in the furnace to 360℃~380℃. After annealing, the hardness of the blank is HRB65~80.

4. The gear machining process for unidirectional meshing according to claim 1, characterized in that, In step S4 or step S10, the phosphating surface treatment process is as follows: First, the workpiece to be treated is degreased using a 5%~10% phosphorus-free degreaser or a 1%~2% water-based cleaning agent. The treatment temperature is 50℃~70℃ and the treatment time is 8~10 minutes to remove oil and impurities from the surface of the workpiece. The free alkalinity is controlled at 30~50 points and the pH value is 12~14. After degreasing, the workpiece is rinsed three times with tap water, each time at a room temperature of 20℃~25℃ for 1~2 minutes to clean the workpiece surface, and the pH value of each cold water rinse is controlled at 6~9. Use tap water for a hot wash at a temperature of 60℃~70℃ for 1~2 minutes, with the pH value controlled at 6~9. Phosphating treatment is carried out using a zinc-based coating agent with a mass ratio of 30%~35%. The treatment temperature is controlled at 70℃~80℃, and the treatment time is 20~25 minutes. The control parameters include: total acidity of 90~140 points when setting up the tank, free acidity of 12~21 points when setting up the tank, acid ratio controlled at 6.5~9, and iron content less than or equal to 4 g / L. After the phosphating treatment is completed, rinse again with tap water at room temperature (20℃~25℃) for 1~2 minutes, keeping the pH value between 6 and 9, to remove excess phosphating residue. Perform a second hot water wash at a temperature greater than or equal to 75℃ for 1 to 2 minutes, with the pH value controlled between 7.5 and 9. Finally, saponification is performed using a lubricant at a mass ratio of 3% to 5%, at a temperature of 65℃ to 75℃, for 5 to 6 minutes, with the free alkalinity controlled at 3 to 7 and the pH value at 8.5 to 9.

5.

5. The gear machining process for unidirectional meshing according to claim 1, characterized in that, In step S11, the coaxiality between the inner ratchet teeth, the outer involute gear, and the involute straight spline is no greater than 0.03 mm.

6. The gear machining process for unidirectional meshing according to claim 1, characterized in that, In step S13, after heat treatment carburizing and quenching, the surface hardness of the workpiece reaches HV. 0.1 710 and above, with a core hardness of HRC40~45.

7. The gear machining process for unidirectional meshing according to claim 1, characterized in that, In step S14, after tempering, the surface hardness of the workpiece reaches HV. 0.1 A score of 700 or higher, with a core hardness of HRC38~43.

8. The gear machining process for unidirectional meshing according to claim 1, characterized in that, In step S14, after tempering, the coaxiality between the inner bore ratchet teeth, the outer involute gear, and the involute straight spline of the workpiece is no greater than 0.05 mm.

9. The gear machining process for unidirectional meshing according to claim 1, characterized in that, In step S3, the shot blasting process lasts for 8 to 12 minutes; in step S9, the shot blasting process lasts for 5 to 10 minutes; in step S15, the shot blasting process lasts for 8 to 10 minutes.

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