Machining process of gear for one-way meshing

Abstract

The invention relates to a machining process of a gear for one-way meshing. The method comprises the following steps: S1, blanking: providing a blank; the blank is subjected to annealing treatment; carrying out shot blasting treatment; carrying out phosphorus saponification surface treatment to promote surface lubrication; two connected cylinders with different sizes are formed in an extrusion material plastic deformation mode; carrying out cold-extrusion flat treading treatment on the blank subjected to cold-extrusion hole shrinkage; pre-forming an outer circle spline extension initial step; carrying out recrystallization annealing treatment; carrying out shot blasting treatment; carrying out phosphorus saponification surface treatment; inner hole ratchet teeth, an outer circle involute gear and an involute straight spline are formed through one-time extrusion; the workpiece obtained after extrusion forming is subjected to turning machining; the turned workpiece is subjected to heat treatment carburizing and quenching treatment; the workpiece subjected to carburizing and quenching treatment is subjected to tempering treatment; and carrying out shot blasting treatment. The single-tooth strength of the inner hole ratchet teeth and the outer circle involute gear is improved, the production efficiency can be greatly improved, and the production cost can be greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of gear processing, in particular to a processing technology for one-way meshing gears. Background Art

[0002] Gears are important transmission components in mechanical devices and are widely used in various mechanical transmissions. Figure 1 As shown, it is a one-way meshing gear used in a transmission device. The outer circle is provided with an outer cylindrical involute spur gear 1 and an involute straight spline 2, and the inner hole is provided with an inner hole ratchet tooth 3 for one-way transmission. Its main technical requirements are: the coaxiality of the inner hole ratchet tooth 3 with the outer cylindrical involute gear 1 and the involute straight spline 2 is not greater than 0.05 mm; when the gear is suddenly stopped 1000 times and is impacted, the inner hole ratchet teeth and the outer cylindrical involute gear will not chip or break.

[0003] Traditional processing technology: precision forging - turning - rolling inner ratchet teeth - rolling (tooth part adopts hobbing process) - gear rolling (processing outer cylindrical involute straight spline) - heat treatment carburizing and quenching - tempering - surface treatment.

[0004] However, using this traditional process, it's difficult to maintain coaxiality within 0.05 between the internal ratchet teeth of the gear and the external involute gear and involute straight spline. Furthermore, when the gear is subjected to shocks during 1,000 sudden stops, the ratchet teeth or external gear are prone to chipping and breaking. Furthermore, the process is complex, resulting in low production efficiency and high costs.

[0005] Therefore, there is an urgent need for a one-way meshing gear processing technology with higher processing accuracy, better single tooth strength and simplified process to improve the comprehensive performance and production efficiency of the gear. Summary of the Invention

[0006] To this end, the present invention provides a one-way meshing gear processing technology, which improves the single tooth strength of the inner hole ratchet teeth and the outer circle involute gear, and can greatly improve production efficiency and reduce production costs.

[0007] In order to solve the above technical problems, the present invention provides a one-way meshing gear processing process, comprising the following steps:

[0008] S1. Blanking: Provide a smooth and cylindrical blank;

[0009] S2, annealing: annealing the blank to soften the metal;

[0010] S3, primary shot blasting: Shot blast the annealed blank to remove residual substances on the surface;

[0011] S4. Primary surface treatment: Phosphorus saponification surface treatment is performed on the blank after shot blasting to promote surface lubrication;

[0012] S5, cold extrusion and diameter reduction: the surface treated blank is subjected to plastic deformation through extrusion material to form two connected cylinders of different sizes;

[0013] S6. Cold extrusion and flattening: The cold extruded and shrunken blank is subjected to cold extrusion and flattening treatment, and the material is plastically deformed again to compress its length and expand its diameter;

[0014] S7, turning the end face and large outer circle: turning to remove the circular collapse angle at the large outer circle, and pre-forming the external cylindrical spline to extend the initial step;

[0015] S8, recrystallization annealing: the blank after turning is subjected to recrystallization annealing treatment;

[0016] S9, secondary shot blasting: Shot blast the blank after recrystallization annealing to remove residual substances on the surface;

[0017] S10, secondary surface treatment: perform phosphorus saponification surface treatment again to promote surface lubrication;

[0018] S11, extrusion forming of internal and external gears: one-time extrusion forming of internal ratchet teeth, external involute gears and involute straight splines;

[0019] S12, turning: Turning the extruded workpiece to achieve the shape and size required by the drawing;

[0020] S13. Heat treatment carburizing and quenching: Place the turned workpieces neatly and flatly on a rack, keeping the interval between the workpieces at 6 to 8 mm; then place the rack into a carburizing furnace, heat to 890°C to 910°C, and control the carbon potential in the furnace to 0.9 to 1. Carburize for 2 to 2.5 hours to form a carburized layer of 0.4 to 0.6 mm on the workpiece surface; after carburizing, continue to diffuse in the furnace for 45 to 50 minutes to ensure that the carbon concentration of the carburized layer decreases in a step-like manner from the surface to the center, so as to prevent the gear from cracking due to excessive carbon concentration on the tooth surface; after diffusion treatment, reduce the furnace temperature to 830°C to 850°C, then quickly remove the workpiece for quenching, and place it in quenching oil at a temperature of 80°C to 90°C for cooling;

[0021] S14, tempering: Tempering the workpiece after carburizing and quenching; move the workpiece into the tempering furnace and temper it at a temperature of 180℃ to 200℃ for 80 to 100 minutes to eliminate residual stress;

[0022] S15, three shot blasting: the workpiece after tempering is shot blasted to clean the surface and improve the tooth root bending fatigue strength.

[0023] In one embodiment of the present invention, in step S1, the blank material is 20CrMnTi alloy steel.

[0024] In one embodiment of the present invention, in step S2, during the annealing treatment, the blank is heated to 870°C to 890°C and then kept warm for 8 hours, and then cooled to 360°C to 380°C with the furnace. After the annealing treatment, the hardness of the blank is HRB65-80.

[0025] In one embodiment of the present invention, in step S4 or step S10, the process of phosphorus saponification surface treatment is as follows:

[0026] First, the workpiece to be processed is degreased by using a 5% to 10% by mass phosphorus-free degreasing agent or a 1% to 2% by mass water-based cleaning agent at a treatment temperature of 50°C to 70°C for 8 to 10 minutes to remove oil stains and impurities on the workpiece surface. The free alkalinity is controlled at 30 to 50 points and the pH value is 12 to 14.

[0027] After degreasing, use tap water to wash three times in sequence, each time at room temperature of 20℃~25℃ for 1~2 minutes to make the surface of the workpiece clean, and the pH value of each cold water wash is controlled at 6~9;

[0028] Use tap water to wash once at a temperature of 60℃~70℃ for 1~2 minutes, and control the pH value at 6~9;

[0029] Phosphating treatment is performed using a PB-513A zinc coating agent with a mass ratio of 30% to 35%, a treatment temperature controlled at 70°C to 80°C, and a treatment time of 20 to 25 minutes. Control parameters include: total acidity of 90 to 140 points when establishing the tank, free acidity of 12 to 21 points when establishing the tank, acid ratio controlled at 6.5 to 9, and iron content less than or equal to 4 g / L;

[0030] After the phosphating treatment is completed, use tap water again at room temperature 20℃~25℃ for 1~2 minutes, and keep the pH value at 6~9 to remove excess phosphating residue;

[0031] Perform a second hot water wash at a temperature greater than or equal to 75°C for 1 to 2 minutes, with the pH value controlled at 7.5 to 9;

[0032] Finally, saponification treatment is carried out, using LUB-601 lubricant with a mass ratio of 3% to 5%, a treatment temperature of 65°C to 75°C, a treatment time of 5 to 6 minutes, free alkalinity controlled at 3 to 7 points, and a pH value of 8.5 to 9.5.

[0033] 5. The one-way meshing gear processing process according to claim 1 is characterized in that, in step S8, during the recrystallization annealing treatment, the turned blank is heated to 850°C to 870°C, kept warm for 6 to 8 hours, and then cooled to below 460°C at a rate of 20°C per hour for air cooling, so that the hardness of the turned blank reaches HRB60 to 75.

[0034] In one embodiment of the present invention, 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.

[0035] In one embodiment of the present invention, in step S13, after the heat treatment carburizing and quenching, the surface hardness of the workpiece reaches HV 0.1 Above 710, the core hardness is HRC40-45.

[0036] In one embodiment of the present invention, in step S14, after tempering, the surface hardness of the workpiece reaches HV 0.1 Above 700, the core hardness is HRC38~43.

[0037] In one embodiment of the present invention, in step S14, after tempering, the coaxiality between the inner ratchet teeth, the outer involute gear and the involute straight spline of the workpiece is no more than 0.05 mm.

[0038] In one embodiment of the present invention, in step S3, the shot blasting treatment time is 8 to 12 minutes; in step S9, the shot blasting treatment time is 5 to 10 minutes; in step S15, the shot blasting treatment time is 8 to 10 minutes.

[0039] The above technical solution of the present invention has the following advantages over the prior art:

[0040] The present invention describes a one-way meshing gear manufacturing process that utilizes a novel process: blanking (20CrMnTi round blank) - annealing - primary shot blasting - primary surface treatment - cold extrusion and reduction - cold extrusion and flattening - end face and large outer diameter turning - recrystallization annealing - secondary shot blasting - secondary surface treatment - extrusion forming of internal and external teeth - turning - heat treatment, carburizing and quenching - tempering - and third shot blasting. The gear utilizes a three-stage extrusion metal plastic forming process, resulting in a denser grain structure. 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 and core toughness are enhanced, improving the single-tooth strength of the inner ratchet teeth and the outer involute gear. This process ensures that the inner ratchet teeth and the outer involute gear will not chip or break even after 1,000 impacts during sudden stops. This process not only ensures product quality but also significantly improves production efficiency, reducing production costs by at least 30 percent compared to existing technologies.

[0041] The present invention adopts high-quality alloy steel, and after cold extrusion, diameter reduction, cold extrusion flattening and one-time lathing preformed blank, it then extrudes inner hole ratchet teeth, outer circle involute gear and involute straight spline at one time, eliminating the errors caused by the original processing technology base conversion and secondary clamping, and ensuring that the coaxiality of the gear inner hole ratchet teeth and the outer circle involute gear and involute straight spline reaches 0.05. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

[0043] Figure 1 It is a front view of a gear of the present invention.

[0044] Figure 2 It is a side view of the gear of the present invention.

[0045] Figure 3 It is a gear processing cutting diagram of the present invention.

[0046] Figure 4 It is a schematic diagram of the cold extrusion and diameter reduction forming structure of the present invention.

[0047] Figure 5 It is a schematic diagram of the cold extrusion flattening forming structure of the present invention.

[0048] Figure 6 It is a schematic diagram of the end face turning and large outer circle forming structure of the present invention.

[0049] Figure 7 It is a schematic diagram of the extruded internal and external tooth forming structure of the present invention.

[0050] Figure 8 It is a schematic diagram comparing the streamlines of metal fibers formed by hobbing the inner hole ratchet teeth and the streamlines of metal fibers formed by cold extrusion.

[0051] Figure 9 It is a schematic diagram comparing the streamlines of metal fibers formed by hobbing of external cylindrical involute gears and those formed by cold extrusion. DETAILED DESCRIPTION

[0052] 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 the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0053] In the present invention, if directions (up, down, left, right, front and back) are described, it is only for the convenience of describing the technical solution of the present invention, and does not indicate or imply that the technical features referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation of the present invention.

[0054] In the present invention, "several" means one or more, "multiple" means more than two, "greater than," "less than," "exceeds," etc. are understood to exclude the number itself; "above," "below," "within," etc. are understood to include the number itself. In the description of the present invention, the use of "first" or "second" is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0055] In the present invention, unless otherwise expressly defined, terms such as "disposed," "installed," and "connected" should be interpreted broadly. For example, they may refer to direct connection or indirect connection through an intermediate medium; fixed connection or detachable connection or integral molding; mechanical connection or electrical connection or mutual communication; and internal connection between two components or interaction between two components. Those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0056] Reference Figure 1 As shown, this embodiment provides a one-way meshing gear processing process, including the following steps:

[0057] S1. Blanking: Provide a smooth cylindrical blank. Figure 3 shown.

[0058] In this embodiment, the blank material is 20CrMnTi alloy steel, which has high strength and toughness, and good hardenability. After carburizing, quenching and tempering, the surface is hard and the core has good toughness.

[0059] S2. Annealing: annealing the blank to soften the metal. During the annealing, the blank is heated to 870°C to 890°C and kept at this temperature for 8 hours. The blank is then cooled to 360°C to 380°C with the furnace. After the annealing, the hardness of the blank is HRB65 to 80.

[0060] S3. One shot blasting: Shot blast the annealed blank for 8 to 12 minutes to remove residual surface substances such as oxide scale.

[0061] S4. Primary surface treatment: Phosphorus saponification surface treatment is performed on the blank after shot blasting to promote surface lubrication. The process of phosphorus saponification surface treatment is as follows:

[0062] First, the workpiece to be processed is degreased by using a 5% to 10% by mass phosphorus-free degreasing agent or a 1% to 2% by mass water-based cleaning agent at a treatment temperature of 50°C to 70°C for 8 to 10 minutes to remove oil stains and impurities on the workpiece surface. The free alkalinity is controlled at 30 to 50 points and the pH value is 12 to 14.

[0063] After degreasing, use tap water to wash three times in sequence, each time at room temperature of 20℃~25℃ for 1~2 minutes to make the surface of the workpiece clean, and the pH value of each cold water wash is controlled at 6~9;

[0064] Use tap water to wash once at a temperature of 60℃~70℃ for 1~2 minutes, and control the pH value at 6~9;

[0065] Phosphating treatment is performed using a PB-513A zinc coating agent with a mass ratio of 30% to 35%, a treatment temperature controlled at 70°C to 80°C, and a treatment time of 20 to 25 minutes. Control parameters include: total acidity of 90 to 140 points when establishing the tank, free acidity of 12 to 21 points when establishing the tank, acid ratio (total acidity / free acidity) controlled at 6.5 to 9, and iron content less than or equal to 4 g / L;

[0066] After the phosphating treatment is completed, use tap water again at room temperature 20℃~25℃ for 1~2 minutes, and keep the pH value at 6~9 to remove excess phosphating residue;

[0067] Perform a second hot water wash at a temperature greater than or equal to 75°C for 1 to 2 minutes, with the pH value controlled at 7.5 to 9;

[0068] Finally, saponification treatment is carried out, using LUB-601 lubricant with a mass ratio of 3% to 5%, a treatment temperature of 65°C to 75°C, a treatment time of 5 to 6 minutes, free alkalinity controlled at 3 to 7 points, and a pH value of 8.5 to 9.5.

[0069] The technical parameters for solution control in the phosphorus saponification surface treatment process are shown in Table 1.

[0070] Table 1: Technical parameters of solution control during phosphorus saponification surface treatment process

[0071]

[0072] S5, cold extrusion and reduction: the surface treated blank is subjected to plastic deformation by extrusion material (using a hydraulic press) to form two connected cylinders of different sizes; Figure 4 shown.

[0073] S6. Cold extrusion and flattening: The cold extruded and shrunken blank is subjected to cold extrusion and flattening treatment (using a hydraulic press), and the material is plastically deformed again to compress its length and expand its diameter; refer to Figure 5 shown.

[0074] S7, turning the end face and large outer circle: Turn to remove the circular collapse angle at the large outer circle a, and after turning both sides of the end face, pre-form the external cylindrical spline in the middle of the end face to extend the initial step b; refer to Figure 5 、 Figure 6 shown.

[0075] S8. Recrystallization annealing: The turned blank is subjected to recrystallization annealing treatment; during the recrystallization annealing treatment, the turned blank is heated to 850℃~870℃, kept warm for 6~8 hours, and then cooled to below 460℃ at a rate of 20℃ per hour for air cooling, so that the hardness of the turned blank reaches HRB60~75.

[0076] S9. Secondary shot blasting: Shot blast the blank after recrystallization annealing for 5 to 10 minutes to remove residual surface substances such as oxide scale.

[0077] S10, Secondary Surface Treatment: Perform phosphorus saponification surface treatment again to promote surface lubrication. The technical parameters for controlling the solution during the phosphorus saponification surface treatment are the same as those in Table 1 (i.e., step S4).

[0078] S11. Extrusion of internal and external gears: Extrusion-form the internal ratchet teeth 3, the external involute gear 1, and the involute straight spline 2 in one step. The coaxiality between the internal ratchet teeth 3, the external involute gear 1, and the involute straight spline 2 is no greater than 0.03 mm.

[0079] S12, turning: Turning the extruded workpiece to achieve the shape and size required by the drawing;

[0080] S13. Heat treatment carburizing and quenching: Place the turned workpieces neatly and flatly on the rack, keeping the interval between the workpieces at 6 to 8 mm; then send the rack into the carburizing furnace, heat it to 890°C to 910°C, and control the carbon potential in the furnace to 0.9 to 1, and perform carburizing treatment for 2 to 2.5 hours to form a carburized layer of 0.4 to 0.6 mm on the surface of the workpiece; after carburizing, continue to perform diffusion treatment in the furnace for 45 to 50 minutes to ensure that the carbon concentration of the carburized layer decreases in a step-like manner from the surface to the center, so as to prevent the gear from cracking due to excessive carbon concentration on the tooth surface; after the diffusion treatment is completed, reduce the furnace temperature to 830°C to 850°C, then quickly take out the workpiece for quenching, and put it into quenching oil at a temperature of 80°C to 90°C for cooling.

[0081] After heat treatment carburizing and quenching, the surface hardness of the workpiece reaches HV 0.1Above 710, the core hardness is HRC40-45.

[0082] S14, Tempering: Temper the workpiece after carburizing and quenching; move the workpiece into the tempering furnace and temper it at 180℃~200℃ for 80~100 minutes to eliminate residual stress. After tempering, the surface hardness of the workpiece reaches HV 0.1 700 (0.1mm depth hardness of the surface is 700) or above, the core hardness is HRC38~43; the coaxiality between the inner hole ratchet teeth, the outer cylindrical involute gear and the involute straight spline of the workpiece is not more than 0.05 mm.

[0083] S15, three shot blasting: after tempering, the workpiece is shot blasted for 8 to 10 minutes to clean the surface and improve the bending fatigue strength of the tooth root. Figure 1 、 Figure 2 shown.

[0084] Figure 8 A comparison is shown of a metal fiber streamline 4 formed by hobbing ratchet teeth on an inner hole (using existing technology) and a metal fiber streamline 3 formed by cold extrusion using the above technology; Figure 9 A comparison is shown of the metal fiber streamlines 6 produced by hobbing an external involute gear and the cold-extruded metal fiber streamlines 5 obtained using the aforementioned process. It can be seen that the metal fiber streamlines obtained using the aforementioned process are continuous, smooth, and consistent with the part's contour, maintaining the material's continuity and density. Due to the three-stage extrusion metal plastic forming process used in this gear, the material's grain structure is more compact. 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 excellent. This improves the single-tooth strength of the inner ratchet teeth and the external involute gear, ensuring that the inner ratchet teeth and the external involute gear will not chip or break when the gear is subjected to impact during 1000 sudden stops.

[0085] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A one-way meshing gear processing process, characterized in that: The steps include: S1. Blanking: Provide a smooth and cylindrical blank; S2, annealing: annealing the blank to soften the metal; S3, primary shot blasting: Shot blast the annealed blank to remove residual substances on the surface; S4. Primary surface treatment: The blank after shot blasting is subjected to phosphorus saponification surface treatment to promote surface lubrication; S5, cold extrusion and diameter reduction: the surface treated blank is subjected to plastic deformation through extrusion material to form two connected cylinders of different sizes; S6. Cold extrusion and flattening: The cold extruded and shrunken blank is subjected to cold extrusion and flattening treatment, and the material is plastically deformed again to compress its length and expand its diameter; S7, turning the end face and large outer circle: turning to remove the circular collapse angle at the large outer circle, and pre-forming the external cylindrical spline to extend the initial step; S8, recrystallization annealing: the blank after turning is subjected to recrystallization annealing treatment; S9, secondary shot blasting: Shot blast the blank after recrystallization annealing to remove residual substances on the surface; S10, secondary surface treatment: perform phosphorus saponification surface treatment again to promote surface lubrication; S11, extrusion forming of internal and external gears: one-time extrusion forming of internal 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 turned workpieces neatly and flatly on a rack, keeping the interval between the workpieces at 6-8 mm; then place the rack into a carburizing furnace, heat to 890-910°C, and control the carbon potential in the furnace to 0.9-1. Carburize for 2-2.5 hours to form a carburized layer of 0.4-0.6 mm on the workpiece surface; after carburizing, continue to diffuse in the furnace for 45-50 minutes to ensure that the carbon concentration of the carburized layer decreases in a step-like manner from the surface to the center, to prevent the gear from cracking due to excessive carbon concentration on the tooth surface; after diffusion treatment, reduce the furnace temperature to 830-850°C, then quickly remove the workpiece for quenching, and place it in quenching oil at a temperature of 80-90°C for cooling; S14, tempering: Tempering the workpiece after carburizing and quenching; move the workpiece into the tempering furnace and temper it at a temperature of 180℃~200℃ for 80~100 minutes to eliminate residual stress; S15, three shot blasting: the workpiece after tempering is shot blasted to clean the surface and improve the tooth root bending fatigue strength.

2. A one-way meshing gear processing process according to claim 1, characterized in that: In step S1, the blank material is 20CrMnTi alloy steel.

3. The one-way meshing gear processing process according to claim 1, characterized in that: In step S2, during the annealing treatment, the blank is heated to 870°C-890°C and then kept at this temperature for 8 hours, and then cooled to 360°C-380°C along with the furnace. After the annealing treatment, the hardness of the blank is HRB65-80.

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

5.

5. The one-way meshing gear processing process according to claim 1, characterized in that: In step S8, during the recrystallization annealing treatment, the turned blank is heated to 850°C~870°C, kept warm for 6~8 hours, and then cooled to below 460°C at a rate of 20°C per hour for air cooling, so that the hardness of the turned blank reaches HRB60~75.

6. The one-way meshing gear processing process 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 more than 0.03 mm.

7. The one-way meshing gear processing process 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 Above 710, the core hardness is HRC40~45.

8. The one-way meshing gear processing process according to claim 1, characterized in that: In step S14, after tempering, the surface hardness of the workpiece reaches HV 0.1 Above 700, the core hardness is HRC38~43.

9. The one-way meshing gear processing process according to claim 1, characterized in that: In step S14, after tempering, the coaxiality between the inner ratchet teeth, the outer involute gear and the involute straight spline of the workpiece is no more than 0.05 mm.

10. The one-way meshing gear processing process according to claim 1, characterized in that: In step S3, the shot blasting treatment time is 8 to 12 minutes; in step S9, the shot blasting treatment time is 5 to 10 minutes; in step S15, the shot blasting treatment time is 8 to 10 minutes.

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