A method for manufacturing a fatigue-resistant bowl bevel gear with internal splines

Abstract

The application discloses a kind of bowl-shaped conical gears with inner spline fatigue-resistant manufacturing method, it is related to gear machining technical field, comprising the following steps: S1 rough turning outer contour;S2 grinding outer circle, end face and addendum circle;S3 each taper is turned;S4 tooth profile rough machining;S5 sharp edge rounding, polishing;S6 heat treatment;S7 reference repair;S8 turn inner cavity, boring, center hole;S9 inner spline processing;S10 drilling and rounding;S11 cyanidation;S12 magnetic flaw detection;S13 grind spline, polishing;S14 grind two outer circles and its end face;S15 tooth profile finishing;S16 magnetic flaw detection.This bowl-shaped conical gears with inner spline fatigue-resistant manufacturing method mainly from two aspects of the process route design of high-hardness bowl-shaped conical gears with inner spline and the fatigue-resistant manufacturing design method of two outer circles and tooth profile, can meet high precision, stable state, good fatigue resistance, suitable for mass production.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gear machining, in particular to a fatigue-resistant manufacturing method for a bowl-shaped bevel gear with internal splines. BACKGROUND

[0002] As an important transmission part, bevel gears play a role in transmitting motion and power between two intersecting shafts in machines, and are widely used in the entire mechanical field. With the development of science and technology, the stability and fatigue resistance of gears are paid more attention to as their rotational speed increases, and the requirements for the structure of gears are becoming more and more stringent.

[0003] A bowl-shaped bevel gear with internal splines (hereinafter referred to as a bowl-shaped bevel gear, see Figure 1 ) has one outer circle at each end (for bearing installation), the material is 12Cr2Ni4A, the whole part is cyanated, the depth is 0.1-0.3mm, the hardness is HR15N≥88, the angular position of the internal spline and the bevel gear is arbitrary, the coaxiality of the two outer circle surfaces is 0.02mm, the runout of the internal spline to the two outer circle surfaces and the end surface is 0.02mm, the runout of the teeth to the two outer circles is 0.05mm, and the thin web of the conical surface is 8mm. During the machining process, the part is easily deformed, resulting in tooth distortion, which affects the reliability and stability of the part.

[0004] Bevel gears are a common type of mechanical gear, generally used as the main transmission part of the component, subjected to large stress and high speed, and have strict requirements for their fatigue resistance. Therefore, the processing technology of the fatigue-resistant manufacturing technology for high-hardness bowl-shaped bevel gears is particularly important, which proves that a stable processing technology and precise positioning method are needed for the machining of the two outer circles and the tooth shape during the manufacturing process of the bowl-shaped bevel gear to ensure the fatigue resistance of the part and improve the production efficiency.

[0005] Therefore, we propose a fatigue-resistant manufacturing method for a bowl-shaped bevel gear with internal splines. SUMMARY

[0006] The technical problem to be solved by the present application is to overcome the existing defects and provide a fatigue-resistant manufacturing method for a bowl-shaped bevel gear with internal splines. The method mainly designs the process route of the high-hardness bowl-shaped bevel gear with internal splines and the fatigue-resistant manufacturing design method of the two outer circles and the tooth shape, which can meet the requirements of high precision, stable state, good fatigue resistance, and is suitable for batch production, and can effectively solve the problems in the background technology.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a fatigue-resistant manufacturing method for a bowl-shaped bevel gear with internal splines, comprising the following steps:

[0008] (1) Rough turning outer contour: processing of the blank forging, including rough turning of the outer circle of the blank, end face, drilling and center hole;

[0009] (2) Grinding outer circle and end face and addendum circle: taking the center hole formed by rough turning outer contour as the positioning clamping surface to process the shaft outer circle and its end face and addendum circle;

[0010] (3) Turning each taper: including turning rear taper, front taper and inner taper, wherein the rear taper is processed to the designed size, and the front and inner tapers are left with excess amount;

[0011] (4) Tooth profile rough machining: including rough milling, rough gear shaving and fine gear shaving, after fine gear shaving, the tooth thickness needs to be left with single-sided excess amount, and the tooth bottom is processed to the designed size;

[0012] (5) Point edge rounding and polishing: using cotton wool to round the point edge along the tooth length, polishing the tooth bottom, and keeping the tooth root fillet, and polishing the large and small modulus tooth end face;

[0013] (6) Heat treatment: including carburizing and high temperature tempering;

[0014] Wherein the carburizing depth is 0.8-1mm; after high temperature tempering, the hardness of the part is HRC≤38, and fine sand is used to remove the surface oxide skin;

[0015] (7) Reference repair: including repairing the center hole, grinding the outer circle and the end face;

[0016] (8) Turning inner cavity, boring and center hole: coloring inspection is performed on the center hole to ensure that the area is at least 75%, and is uninterrupted along the circumference; the addendum circle of the inner spline is processed to the designed size by boring the inner hole;

[0017] (9) Inner spline machining: using the method of pulling spline or inserting spline to machine the inner spline, and the positioning surface needs to use the large end face positioning;

[0018] (10) Drilling and rounding: drilling two holes on the end face, and performing point edge rounding and polishing;

[0019] (11) Cyanidation: selecting the surface of the carburized area for cyanidation, and removing the oxide skin by blowing fine sand;

[0020] (12) Magnetic flaw detection I: checking whether the part has cracks and other defects;

[0021] (13) Polishing and grinding inner spline: removing the oxide skin remaining on the inner spline during the cyanidation process;

[0022] (14) grinding two outer circles and end faces: using a positioning tool to cooperate with the inner spline positioning bowl-shaped bevel gear, the two bearing surface references are unified, the center axis of the bowl-shaped grinding wheel, the center axis of the positioning tool and the center axis of the part are in the same plane state during processing, and the bowl-shaped grinding wheel rotates to simultaneously grind and process two outer circles and end faces;

[0023] (15) tooth profile finishing: including tooth grinding, low temperature tempering, burn detection, meshing detection, again rounding the sharp edge and polishing;

[0024] Wherein the tooth profile related dimensions and technical conditions are processed to the design requirements during tooth grinding;

[0025] (16) magnetic flaw detection II: detecting whether there is fatigue defect after tooth grinding.

[0026] Further, in the process of grinding two outer circles and end faces and tooth profile finishing, the low temperature tempering time is controlled at 2.5-3H, and the temperature is 145±10℃.

[0027] Further, when rough turning the outer contour, grinding the outer circle and end face and the addendum circle, the center hole and the end face are inspected by coloring, and the coloring area is at least 75% and uninterrupted along the circumference.

[0028] Further, the sharp edge rounding and polishing process is as follows:

[0029] ① adopt cotton file to round the sharp edge R0.4-0.6 mm along the tooth length;

[0030] ② adopt 301 polishing paste to polish the tooth bottom, and keep the tooth root fillet: large end R1.8±0.3 mm, small end minimum R1.2 mm, smooth transition;

[0031] ③ polish and polish the large and small modulus tooth end face.

[0032] Further, the reference repair process is as follows:

[0033] ① the reference hole can be repaired by scraping or internal grinding, and the center hole area shall be inspected by coloring and shall not be less than 75% and uninterrupted along the circumference;

[0034] ② the center hole after repair is positioned and clamped when grinding the outer circle and end face, and the runout of the outer circle to the two center holes after grinding is not more than 0.008 mm, and the runout of the end face is not more than 0.01 mm, wherein the end face is a process surface for pulling the spline positioning.

[0035] Further, when the positioning tool cooperates with the inner spline, the center axis of the bowl-shaped grinding wheel, the center axis of the positioning tool and the center axis of the part are in the same plane state during processing, and the internal outer circle and end face are processed by the rotating bowl-shaped grinding wheel.

[0036] Further, the positioning tool selects a cone spline mandrel, which has a spline shaft, and spline teeth are arranged on the spline shaft along the axial direction.

[0037] Further, the bowl-shaped grinding wheel is in the shape of a bowl as a whole, has a mounting hole at the center, and has polishing conical surfaces corresponding to the outer circles and the end faces.

[0038] Further, the grinding inner spline and the polishing method are as follows:

[0039] ①The prepared grinding paste is evenly coated on the positioning tool;

[0040] ②The positioning tool is matched with the inner spline of the part;

[0041] ③The grinding force is increased in the radial direction along the axial direction of the spline shaft, so that the spline pair can move freely in the axial direction;

[0042] ④The tooth matching is exchanged, and steps ① to ③ are performed.

[0043] Further, the specific steps of bearing surface processing are as follows:

[0044] Step 1: Before the part is processed, the positioning tool is engaged with the inner spline without side play, and the position of the bevel gear is fixed; then, the bearing surface and the end face of one end are processed first, so that the runout of the bearing outer circle and the end face to the inner spline is not more than 0.01 mm; the outer circle size is ensured; the surface roughness is ensured; the end face is inspected by coloring, and the area is ensured to be at least 80%, and uninterrupted along the circumference;

[0045] Step 2: Without taking down the positioning tool, the bearing surface and the end face of the other end are processed, and after the size, runout and roughness are inspected, the positioning tool is taken down.

[0046] Further, the sharp edge rounding and polishing include rounding along the tooth length direction, polishing the tooth end face edge, and polishing the tooth bottom oxide skin. The polishing is carried out on the polishing machine using polishing paste.

[0047] Compared with the prior art, the bowl-shaped bevel gear with inner splines has the following advantages:

[0048] 1. The size precision, form and position tolerance, and surface roughness of the bowl-shaped bevel gear are difficult to meet the use requirements efficiently and with high quality. Through reasonable planning of the process route, a bowl-shaped bevel gear machining process is designed, which can meet the requirements of high precision, stable state, good fatigue resistance, and is suitable for batch production of bevel gears.

[0049] 2. The positioning tool makes the two outer circles and the tooth shape three references uniform.

[0050] 3. The bowl-shaped positioning grinding wheel is used for processing the outer circle and end face of the bowl-shaped bevel gear, the outer circle and end face of the bowl-shaped bevel gear are processed by using the common outer circle grinding method, and the two outer circles and end faces are processed by one-time clamping;

[0051] 4. The fatigue resistance of the gear is improved;

[0052] 5. The process flow is simple and clear, the portable working efficiency is realized, and the technical requirement for the operator is not high. BRIEF DESCRIPTION OF DRAWINGS

[0053] Figure 1 It is a schematic view of the bowl-shaped bevel gear of the application;

[0054] Figure 2 It is a schematic view of the positioning tool of the application;

[0055] Figure 3 It is a schematic view of the bowl-shaped grinding wheel after modification of the application;

[0056] Figure 4 It is a schematic view of the bowl-shaped grinding wheel after modification and the part processing of the application;

[0057] Figure 5 It is a schematic view of the special tool and the part of the application in meshing assembly without side clearance;

[0058] Figure 6 It is a schematic view of the blank forging of the application;

[0059] Figure 7 It is a schematic view of the outer circle, end face and addendum circle of the application;

[0060] Figure 8 It is a schematic view of the outer circle and end face grinding and addendum circle of the application;

[0061] Figure 9 It is a schematic view of the processing of each cone surface of the application;

[0062] Figure 10 It is a schematic view of the tooth profile rough machining of the application;

[0063] Figure 11 It is a schematic view of the chamfering and polishing of the application;

[0064] Figure 12 It is a schematic view of the repair reference of the application;

[0065] Figure 13 It is a schematic view of the inner cavity, boring and center hole of the application;

[0066] Figure 14 It is a schematic view of the spline machining of the application;

[0067] Figure 15 Schematic diagram of drilling two holes and rounding for the present application;

[0068] Figure 16 Schematic diagram of grinding two outer circles and end faces for the present application;

[0069] Figure 17 Schematic diagram of tooth profile finishing tooth coloring area for the present application.

[0070] In the figure: 1 inner outer circle, 2 inner end face, 3 outer outer circle, 4 outer end face, 5 bevel gear tooth, 6 inner spline, 7 spline shaft, 8 outer spline, 9 bowl-shaped grinding wheel. Embodiment

[0071] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0072] Please refer to Figures 1-17 , the present embodiment provides a technical solution: comprising the following steps:

[0073] (1) Rough turning outer contour: processing the blank forging, including rough turning outer circle, end face, drilling and center hole (as shown in Figure 7 ), wherein the bearing outer circle machining thickness is 2mm, the addendum circle machining thickness is 3mm, the end face machining thickness is 3.8mm, the center hole and the end face are inspected by coloring, and the coloring area is at least 75% and uninterrupted along the circumference; the blank forging (as shown in Figure 6 ) is a III class forging, the heat treatment is normalizing and quenching and tempering treatment, and the inspection is performed according to ultrasonic flaw detection, so as to improve the cutting performance and fatigue resistance of the part;

[0074] (2) Grinding outer circle and end face and addendum circle: taking the center hole formed by rough turning outer contour as positioning Add , clamping surface machining shaft outer circle and its end face, addendum circle, (see Figure 8 ), the bearing outer circle machining thickness is 0.3mm, the addendum circle machining thickness is 0.4mm, and the end face machining thickness is 1.5mm, so as to ensure that the runout of the outer circle and the end face to the center hole is not more than 0.01;

[0075] The center hole and the end face are inspected by coloring, and the coloring area is at least 75% and uninterrupted along the circumference;

[0076] (3) Turning each taper: including turning rear taper, front taper and inner taper, wherein the rear taper is machined to the designed size, and the front and inner tapers are left with a margin; (see Figure 9), prevent the deformation of the part after the subsequent heat treatment process;

[0077] (4) rough tooth profile machining: including rough milling, rough gear shaping, and fine gear shaping. After fine gear shaping, the tooth thickness needs to be left with a 0.17 mm allowance on one side, and the tooth bottom is machined to the design size; the big end tooth root radius is R1.8±0.3 mm, the small end tooth root radius is R1.2 min, the tooth surface is checked for coloring meshing with a standard gear, and the contact area is required to be symmetrical; Figure 10

[0078] (5) sharp edge rounding and polishing: including rounding the sharp edge along the tooth length, polishing the tooth end face edge, and polishing the tooth bottom oxide skin. Polishing is processed on a polishing machine using polishing paste. The specific steps are as follows:

[0079] ① use cotton wool to round the sharp edge along the tooth length R0.4-0.6 mm;

[0080] ② use 301 polishing paste to polish the tooth bottom, and keep the tooth root radius: big end R1.8±0.3 mm, small end minimum R1.2 mm, smooth transition;

[0081] ③ polish and polish the large and small modulus tooth end face. (See Figure 11 )

[0082] (6) heat treatment: including carburizing and high temperature tempering;

[0083] The carburizing depth is 0.8-1 mm; after high temperature tempering, the hardness of the part is HRC≤38, and fine sand is used to remove the surface oxide skin; this method can increase the surface residual compressive stress without affecting the size of the part, which is beneficial to improve the fatigue resistance;

[0084] (7) reference repair: including repairing the center hole, grinding the outer circle, and grinding the end face:

[0085] ① the reference hole can be repaired by scraping or internal grinding, and the center hole area needs to be checked for coloring, which is not less than 75%, and there is no interruption along the circumference;

[0086] ② the outer circle and the end face are positioned and clamped by the repaired center hole. After grinding, the outer circle has a runout of not more than 0.008 mm to the two center holes, of which the outer circle diameter direction leaves a 0.15 mm allowance after cyanation, and the end face has a runout of not more than 0.01 mm, which is the process surface for key positioning. (See Figure 12 );

[0087] (8) turning the inner cavity, boring the hole, and centering the hole: (see Figure 13 ), the center hole is checked for coloring, and the inner spline tooth crest circle is machined to the design size by boring the inner hole;

[0088] ​The color inspection center hole and end face, the color area is at least 75%, and is uninterrupted along the circumference;

[0089] (9) Internal spline machining: adopt the way of spline or spline processing internal spline, positioning surface needs to adopt large end surface positioning; wherein the angular position of spline tooth part is arbitrary; because the spline is longer, in order to prevent the spline from being inserted or pulled due to the large machining stress, the positioning surface needs to be positioned by large end surface (such as shown in Figure 14 );

[0090] (10) Drilling and rounding: drill two holes (for bearing disassembly) on the end face; and chamfer the sharp edge and polish; wherein the angular position of the two holes to the tooth part and internal spline is arbitrary, the end face of the two holes is polished to R0.3-0.5mm fillet (see Figure 15 ), and polished to R1.6, the purpose is that if there is a sharp edge at the end face of the two holes during the cyanation process, stress concentration will easily occur, which will cause defects such as delayed cracks, resulting in failure of the part;

[0091] (11) Cyanation: select the surface of the carburized area for cyanation and remove the oxide skin by blowing fine sand;

[0092] The cyanation process requires that the surface hardness of the carburized area is HRC=59-62, the cyanation layer depth is 0.1-0.3mm, the core hardness is d=3.4-3.1, and the oxide skin is removed by blowing fine sand. This method can increase the surface residual compressive stress without affecting the size of the part, which is beneficial to improve the fatigue resistance;

[0093] (12) Magnetic flaw detection I: check whether the part has crack defects;

[0094] (13) Grind internal spline and polish: remove the oxide skin remaining on the internal spline during cyanation;

[0095] The grinding internal spline and polishing method is as follows:

[0096] ① Apply the prepared grinding paste evenly on the positioning tool;

[0097] ② Match the positioning tool with the internal spline of the part;

[0098] ③ Grind back and forth along the axial direction of the spline, find the tightest tooth, and increase the grinding force in the radial direction to make the spline pair move freely in the axial direction;

[0099] ④ Exchange the tooth matching, and follow steps ① to ③;

[0100] (14) Grinding two outer circles and their end faces: using a positioning tool to match the inner spline positioning bowl-shaped bevel gear, the two bearing surface references are unified, the center axis of the bowl-shaped grinding wheel, the center axis of the positioning tool and the center axis of the part are in the same plane during processing, and the two outer circles and their end faces are simultaneously ground and formed by using a rotating bowl-shaped grinding wheel (see Figure 16 );

[0101] The positioning tool is a spline core rod with a spline shaft, and spline teeth are arranged on the spline shaft in the axial direction; the positioning tool serves as a comprehensive gauge, i.e., it can detect the overall performance of the inner spline in advance and whether it meets the assembly requirements with the spline shaft, and it can also meet the coaxiality requirements after the processing of the two outer circles;

[0102] The bowl-shaped grinding wheel is in the shape of a bowl as a whole, has a mounting hole at the center, and has a polishing conical surface corresponding to the outer circle and its end face;

[0103] The bowl-shaped positioning grinding wheel plays the following roles: ① It solves the processing of the bowl-shaped inner and outer circles, because when using conventional outer circle grinding machines or inner circle grinding machines for processing, the linear speed is difficult to meet the requirements, and surface defects such as grinding cracks are easily produced; ② It synchronously processes the two outer circles and their end faces, solves the processing difficulty of the bowl-shaped inner and outer circles, ensures the installation of bearings, etc., and avoids the deviation of form and position errors caused by reference conversion;

[0104] The specific steps of bearing surface processing are as follows:

[0105] Step 1: Before processing the part, the positioning tool is engaged with the inner spline without side play, and the position of the bevel gear is fixed; then the bearing surface and its end face at one end are processed first, to ensure that the runout of the bearing outer circle and its end face to the inner spline is not more than 0.01 mm; to ensure the outer circle size; to ensure the surface roughness; to check the end face by coloring, to ensure that the area is at least 80% and is uninterrupted along the circumference;

[0106] Step 2: Without removing the positioning tool, the bearing surface and its end face at the other end are processed, and after the size, runout and roughness are inspected, the positioning tool is removed.

[0107] (15) Tooth profile finishing: including tooth grinding, low-temperature tempering, burn detection, meshing detection, rounding of sharp edges again, and polishing;

[0108] Among them, the tooth profile related size and technical condition is processed to the design requirement during tooth grinding; the low-temperature tempering time is controlled within 2.5-3H, and the temperature is 145±10℃, to reduce the residual tensile stress generated by tooth grinding;

[0109] Burn detection is to check whether the tooth surface has grinding burn, whether the tooth surface has been oxidized due to instantaneous grinding heat, and whether it has caused color change of the tooth surface. If grinding burn occurs, it will cause the meshing gear to wear out prematurely and shorten the service life of the gear;

[0110] engagement detection tooth portion coloring area (see Figure 17 ) ; sharp edge rounding and polishing is to avoid tooth profile concave and convex points, improve surface roughness.

[0111] (16) magnetic force detection II: detect whether there is fatigue defect after grinding teeth, and the magnetic force detection process is required to be carried out at least 7 days after grinding teeth, the purpose is to detect whether there is fatigue defect of delayed crack after grinding teeth.

[0112] The above only describes the embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method of manufacturing a fatigue resistant bowl bevel gear with in- meshing splines, characterized by, The method comprises the following steps: (1) rough turning outer contour: processing the blank forging, including rough turning the outer circle, end face, drilling and center hole; (2) grinding outer circle, end face and addendum circle: taking the center hole formed by rough turning outer contour as the positioning and clamping surface to process the outer circle and its end face and addendum circle; (3) turning each taper surface: including turning rear taper surface, front taper surface and inner taper surface, wherein the rear taper surface is processed to the designed size, and the front and inner taper surfaces are left with excess amount; (4) tooth profile rough machining: including rough milling, rough gear shaping and fine gear shaping, after fine gear shaping, the tooth thickness needs to be left with excess amount on one side, and the tooth bottom is processed to the designed size; (5) tip edge rounding and polishing: rounding the tip edge along the tooth length, polishing the tooth bottom, and keeping the tooth root fillet, and grinding and polishing the large and small modulus tooth end face; (6) heat treatment: including carburizing and high temperature tempering; wherein the carburizing depth is 0.8-1mm; after high temperature tempering, the hardness of the part is HRC≤38, and fine sand blowing is used to remove the surface oxide skin; (7) reference repair: including repairing the center hole, grinding the outer circle and the end face; the reference repair process is as follows: ① repairing the reference hole by scraping or grinding on the internal grinding machine, the center hole area needs to be checked by coloring, and the area is not less than 75%, and there is no discontinuity along the circumference; ② grinding the outer circle and the end face by positioning and clamping with the repaired center hole, the run-out of the outer circle to the two center holes after grinding is not more than 0.008mm, wherein the outer circle diameter direction is left with 0.15mm excess amount after cyaniding, and the run-out of the end face is not more than 0.01mm, wherein the end face is the process surface for spline pulling positioning; (8) turning inner cavity, boring and center hole: checking the center hole by coloring, and processing the addendum circle of the internal spline to the designed size by boring the inner hole; (9) internal spline machining: machining the internal spline by spline pulling or spline inserting, and the positioning surface needs to be positioned by the large end face; (10) drilling and rounding: drilling two holes on the end face, and rounding the tip edge and grinding; (11) cyaniding: selecting the surface of the carburizing area for cyaniding, and removing the oxide skin by fine sand blowing; (12) magnetic flaw detection I: checking whether the part has crack defects; (13) grinding internal spline and polishing: removing the oxide skin remaining on the internal spline during the cyaniding process; (14) grinding two outer circles and their end faces: using the positioning tooling to cooperate with the internal spline positioning bowl-shaped bevel gear, so that the two bearing surface references are unified, the center axis of the bowl-shaped grinding wheel, the center axis of the positioning tooling and the center axis of the part are in the same plane state during machining, and the bowl-shaped grinding wheel rotates to simultaneously grind and form the two outer circles and their end faces; (15) tooth profile finishing: including grinding, low temperature tempering, burn detection, meshing detection, rounding the tip edge again and polishing in sequence; wherein the tooth profile related size and technical condition are processed to the designed requirement during grinding; (16) magnetic flaw detection II: detecting whether there is fatigue defect after grinding.

2. A method of manufacturing a fatigue resistant bowl bevel gear with internal splines according to claim 1, characterized in that: In the tooth profile finishing process, the low temperature tempering time is controlled to be 2.5-3H, and the temperature is 145±10℃.

3. A method of manufacturing a fatigue resistant bowl bevel gear with internal splines according to claim 1, characterized in that: During rough turning outer contour, grinding outer circle and end face and addendum circle, turning inner cavity, boring and center hole, the center hole and the end face are checked by coloring, and the coloring area is at least 75%, and there is no discontinuity along the circumference.

4. A method of manufacturing a fatigue resistant bowl bevel gear with internal splines according to claim 1, characterized in that: The tip edge rounding and polishing process is as follows: ① The tooth edge is rounded with a radius of 0.4-0.6 mm along the tooth length; ② The tooth bottom is polished with 301 polishing paste, and the tooth root fillet is kept as follows: R1.8±0.3 mm for the large end, and R1.2 mm for the small end, with a smooth transition; ③ The large and small modulus tooth end faces are polished.

5. A method of manufacturing a fatigue resistant bowl bevel gear with internal splines according to claim 1, characterized in that: The positioning tool is a tapered spline mandrel, which has a spline shaft, and spline teeth are arranged on the spline shaft along the axial direction.

6. A method of making a fatigue resistant bowl bevel gear with internal splines according to claim 1, wherein: The bowl-shaped grinding wheel is in the shape of a bowl as a whole, has a mounting hole at the center, and has a polishing conical surface corresponding to the outer circle and the end face.

7. A method of making a fatigue resistant bowl bevel gear with internal splines according to claim 5, wherein: The polishing method for the inner spline is as follows: ① Apply the prepared polishing paste evenly on the positioning tool; ② Fit the positioning tool with the inner spline of the part; ③ Reciprocally grind along the axial direction of the spline shaft, find the tightest tooth, and appropriately increase the grinding force in the radial direction, so that the spline pair can freely move in the axial direction; ④ Exchange the tooth fit, and perform steps ① to ③.

8. A method of manufacturing a fatigue resistant bowl bevel gear with internal splines according to claim 1, characterized in that: The specific steps of bearing surface machining are as follows: Step 1: Before machining the part, engage the positioning tool with the inner spline without side clearance, and then fix the position of the bevel gear; then, machine the bearing surface and the end face of one end, ensure that the runout of the bearing outer circle and the end face to the inner spline is not more than 0.01 mm; ensure the outer circle size; ensure the surface roughness; color check the end face, and ensure that the area is at least 80% and uninterrupted along the circumference; Step 2: Without removing the positioning tool, machine the bearing surface and the end face of the other end, and after checking the size, runout and roughness, remove the positioning tool.

9. A method of manufacturing a fatigue resistant bowl bevel gear with internal splines according to claim 1, characterized in that: The edge rounding and polishing include rounding along the tooth length, polishing the tooth end face edge, and polishing the tooth bottom oxide skin, and the polishing is performed on a polishing machine using polishing paste.

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