Spinning face gear processing method for constant speed drive half shaft housing

Abstract

The invention discloses a method for processing the end face teeth of a half-axle housing with constant speed drive, which belongs to the technical field of half-axle housing processing, and comprises the following steps: warm forging a blank, extruding the raw material into a blank required by the half-axle; residual heat normalizing, using the residual heat to pass the forging through a fixed tunnel constant temperature furnace to remove stress; surface treatment, removing impurities on the surface of the forging; machining the end face, processing the pre-spinning plane; spinning production, clamping the forging by a clamp, with the pre-spinning plane facing upward, and performing end face tooth spinning processing by a spinning machine; the output shaft of the spinning machine is connected with a rivet head, the rivet head is coaxial with the forging, the axis of the rivet head and the output shaft of the spinning machine form a certain angle a, the rivet head is detachably connected with an intermediate cutter disc, and the lower end face of the intermediate cutter disc is evenly spaced with a plurality of intermediate teeth. The method of the invention can greatly improve the processing efficiency of the end face of the half-axle housing, and also has the characteristics of high precision, low cost, environmental protection, etc.

Description

Technical Field

[0001] The invention belongs to the technical field of half-shaft shell processing, and in particular relates to a method for processing end face teeth of a half-shaft shell driven at a constant speed. Background Art

[0002] The half shaft is the shaft that transmits torque between the gearbox reducer and the drive wheel. There is a universal joint on each of its inner and outer ends, which are connected to the reducer gear and the inner ring of the hub bearing through the splines on the universal joint. The half shafts commonly used in modern cars are of two types: full floating and semi-floating, depending on their support types. The semi-floating half shaft transmits torque and bears all reaction forces and bending moments. Its support structure is simple and low in cost. It is mainly suitable for pickup trucks and SUV vehicles that do not require high comfort. However, because the balance of the half shaft is relatively limited, it is often necessary to equip it with a shell to enhance its overall stability. The existing processing of the end face teeth of the half shaft shell is mostly forging technology, and its disadvantages are:

[0003] 1. Low processing efficiency. The traditional processing process of the shell end face gear of the half shaft has many steps. The process flow is basically forging-annealing-shot blasting-saponification-cold extrusion-finishing. In the forging process, in order to ensure the accuracy, the blank needs to be pressed into the mold cavity by hot pressing or cold pressing to form a molded part with a configuration matching the mold cavity. In addition, a large number of subsequent process steps seriously affect the processing efficiency.

[0004] 2. The processing accuracy is not enough. In the traditional processing technology, the oil pressure control accuracy of the mechanical press is unstable during forging, cold extrusion and finishing, which easily causes the tooth surface of the product to be uneven and incomplete, and the processing accuracy is low.

[0005] 3. High cost, because the traditional production method of this product has many processes, requires many molds and has high costs.

[0006] 4. Not environmentally friendly. The traditional saponification process has an impact on the environment and lowers the production threshold. Summary of the invention

[0007] In view of this, the purpose of the present invention is to provide a method for processing the end face teeth of a half-shaft housing with a constant speed drive, which can greatly improve the processing efficiency of the end face of the half-shaft housing and also has the characteristics of high precision, low cost and environmental protection.

[0008] In order to achieve the above object, the present invention provides the following technical solutions:

[0009] A method for machining end face gears of a constant speed drive half shaft housing by spinning, comprising the following steps:

[0010] S1, warm forging the blank, extruding the raw material into the blank required for the half shaft;

[0011] S2, residual temperature normalizing, using the residual temperature to pass the forging through a fixed tunnel constant temperature furnace to remove stress;

[0012] S3, surface treatment, removing impurities on the surface of forgings;

[0013] S4, machining end face, processing pre-spinning plane;

[0014] S5, spinning production, the forging is clamped by a clamp, with the pre-spinning plane facing upward, and the end face teeth are spun by a spinning machine; the output shaft of the spinning machine is connected with a rivet head, the rivet head is coaxial with the forging, and there is a certain angle a between the axis of the rivet head and the output shaft of the spinning machine, the rivet head is detachably connected with an intermediate cutter disc, and a plurality of intermediate teeth are evenly distributed on the lower end surface of the intermediate cutter disc.

[0015] Further, after step S4, step S4.1 is also included, cold forging grooves, pre-cold forging the grooves by a cold forging machine, the grooves are evenly distributed in an annular shape on the pre-spinning plane, the grooves include inner grooves, middle grooves and outer grooves connected in sequence, and the middle groove corresponds to the tooth groove position of the forging.

[0016] Further, after step S4.1, it also includes step S4.2, spinning the inner groove, installing the inner cutter disc on the inner side of the middle cutter disc, the outer side of the inner cutter disc is evenly distributed with a plurality of first vertical ridges, the inner side of the middle cutter disc is evenly distributed with a plurality of first vertical grooves, the first vertical grooves correspond one-to-one to the first vertical ridges, and the middle cutter disc and the inner cutter disc are connected by a first locking member; a plurality of inner cutter teeth are evenly distributed on the lower end surface of the inner cutter disc, the inner cutter teeth correspond one-to-one to the inner grooves, and the blade surfaces of the inner cutter teeth are inclined toward the side where the middle groove is located; after the inner cutter disc is installed, start the spinning machine to allow the inner cutter teeth to pre-spin the inner groove.

[0017] Further, after step S4.2, step S4.3 is also included, in which an outer groove is spun, and an outer cutter disc is installed on the outer side of the middle cutter disc, wherein a plurality of second vertical ridges are evenly distributed on the inner side of the outer cutter disc, and a plurality of second vertical grooves are evenly distributed on the outer side of the middle cutter disc, and the second vertical grooves correspond one-to-one to the second vertical ridges, and the middle cutter disc is connected to the outer cutter disc via a second locking member; a plurality of outer blade teeth are evenly distributed on the lower end surface of the outer cutter disc, and the outer blade teeth correspond one-to-one to the outer grooves, and the blade surfaces of the outer blade teeth are inclined toward the side where the middle groove is located; after the outer cutter disc is installed, the spinning machine is started to allow the outer blade teeth to pre-spin the outer groove.

[0018] Further, in step S5, the chip removal assembly is started to remove chips during the end face tooth spinning processing, the chip removal assembly includes a rotating shaft, a first roller, a second roller, a gear, a rack and a reset spring, a column groove is opened on the end face of the middle tooth, a rotating shaft is coaxially arranged in the column groove, a first roller and a second roller are connected to the rotating shaft at intervals, a first spiral groove and a second spiral groove with opposite rotation directions are respectively opened on the first roller and the second roller, a gear is connected to the middle part of the rotating shaft, the gear is meshed with the rack, the rack is slidably arranged in a slideway opened on the inner side of the middle tooth, and the rack is connected to the middle tooth through a reset spring.

[0019] Furthermore, an annular receiving groove is provided on the inner side of the intermediate blade disc, and the annular receiving groove is filled with lubricating liquid. A liquid replenishing hole connected with the annular receiving groove is provided on the upper end of the intermediate blade disc, and the upper end of the slide is connected with the annular receiving groove. A baffle is fixed at the upper opening of the slide, and a guide hole is provided on the baffle. A guide rod is fixedly connected to the upper end of the rack, and the upper end of the guide rod is slidably arranged in the guide hole. A liquid receiving groove is provided in the middle part of the guide rod, and a sponge is provided on the outer side of the guide rod, and the sponge is limited by the baffle.

[0020] Furthermore, an annular air groove is provided on the inner side of the intermediate cutter disc, an annular piston plate is slidably arranged in the annular air groove, the lower end of the annular piston plate is connected to the rack through a bracket, an air blowing hole connected to the annular air groove is provided on the inner side of the column groove, an air inlet hole is provided on the upper end of the intermediate cutter disc, and an air inlet flow channel corresponding to the air inlet hole is provided on the lower end surface of the rivet head, and the air inlet flow channel extends radially and corresponds to the air inlet hole during installation.

[0021] Furthermore, after step S4.3, step S4.4 is also included, after removing the inner cutter disc and the outer cutter disc, the inner circle and the outer circle of the forging are trimmed by the bottom fine milling device so that the error requirement is within the tolerance range of ±0.02mm.

[0022] Further, in step S2, the temperature range of the residual temperature normalizing is 600°C to 700°C.

[0023] The beneficial effects of the present invention are:

[0024] The invention discloses a method for processing the end face teeth of a half-axle housing by spinning at a constant speed drive. After the blank is warm forged, it can be directly used for spinning production. The intermediate teeth of the intermediate cutter disc are used for forming the end face teeth of the half-axle housing, which greatly improves the production efficiency.

[0025] In the processing method disclosed in the present invention, the existing spinning machine is matched with the rivet head, the axis of the output shaft of the spinning machine is along the vertical direction, and a certain angle a is formed between the axis of the rivet head and the output shaft of the spinning machine. This ensures that when the spinning machine rotates, the intermediate cutter disc connected to the rivet head can intermittently contact the surface to be processed of the forging in a circular flipping manner. Repeated contact increases the processing accuracy of the forging, and there is no need to perform finishing processing on the tooth shape.

[0026] The processing method disclosed in the present invention greatly improves processing efficiency, has high precision, convenient control, low cost, and is more environmentally friendly. It eliminates the impact of the saponification process on the environment and lowers the production threshold.

[0027] Other advantages, objectives and features of the present invention will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art may be taught from the practice of the present invention. The objectives and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration:

[0029] Figure 1 It is a structural schematic diagram of the spinning machine and the rivet head of the present invention;

[0030] Figure 2 It is a front view of the spinning machine of the present invention;

[0031] Figure 3 It is a schematic diagram of the structure of three cutter discs;

[0032] Figure 4 It is a top view of three cutter discs;

[0033] Figure 5 is a schematic diagram of the structure of the middle gear;

[0034] Figure 6 is a schematic diagram of the structure of the groove;

[0035] Figure 7 It is a cross-sectional view of three cutter discs;

[0036] Figure 8 is a cross-sectional view of the middle cutter disc;

[0037] Fig. 9 for Figure 8 Enlarged view at A.

[0038] The markings in the accompanying drawings are as follows: spinning machine 1, rivet head 2, middle cutter disc 3, middle tooth 4, inner groove 5, middle groove 6, outer groove 7, inner cutter disc 8, first vertical ridge 9, first vertical groove 10, first locking piece 11, inner cutter tooth 12, outer cutter disc 13, second vertical ridge 14, second vertical groove 15, second locking piece 16, outer cutter tooth 17, rotating shaft 18, first roller 19, second roller 20, gear 21, rack 22, return spring 23, column groove 24, first spiral groove 25, second spiral groove 26, slideway 27, annular accommodating groove 28, liquid replenishing hole 30, baffle 31, guide hole 32, guide rod 33, liquid containing groove 34, sponge 35, annular air groove 36, annular piston plate 37, bracket 38, blowing hole 39, air inlet hole 40. DETAILED DESCRIPTION

[0039] like Figures 1 to 9 As shown, the spinning face gear processing method of the constant speed drive half shaft housing includes the following steps:

[0040] S1. Warm forging blanks, extruding the raw materials into blanks required for half-axles, whose shapes correspond to the half-axle housing parts of different specifications;

[0041] S2. Residual temperature normalizing: using the residual temperature, the forgings are passed through a fixed tunnel constant temperature furnace to remove stress. The normalizing temperature is between 600℃ and 1200℃; the normalizing time is 120 minutes.

[0042] S3, surface treatment, remove impurities on the surface of forgings, including impurities such as oxide scale on the metal surface;

[0043] S4, machining end face, machining pre-spinning plane, the surface roughness after machining shall not exceed 0.8μm;

[0044] S5. Spinning production: clamp the forging with a fixture, with the pre-spinning plane facing upward, the upper surface of the forging perpendicular to the axis of the output shaft, and perform end face tooth spinning processing through a spinning machine 1; the spinning machine 1 adopts an existing structure, and a rivet head 2 is installed on a wheel hub riveting device. The output shaft of the spinning machine 1 is connected with the rivet head 2, and the rivet head 2 is coaxial with the forging. There is a certain angle a between the axis of the rivet head 2 and the output shaft of the spinning machine 1, and the angle is between 0° and 10°. An intermediate cutter head 3 is detachably connected to the rivet head 2, and a plurality of intermediate teeth 4 are evenly spaced on the lower end surface of the intermediate cutter head 3. The shape of the intermediate teeth 4 corresponds to the tooth shape of the end face teeth of the half-axle housing to be processed, and the length of the intermediate teeth 4 is less than the thickness of the toothed end face of the forging. The two complement each other to produce a desired shape.

[0045] In the present invention, a certain angle a is formed between the axis of the rivet head 2 and the output shaft of the spinning machine 1, thereby ensuring that when the spinning machine 1 rotates, the intermediate cutter disc 3 connected to the rivet head 2 can intermittently contact the surface to be processed of the forging in a circular flipping manner, similar to a disc that continuously flips and stays on the tabletop, and repeatedly removes the surface processing in this way, thereby increasing the processing accuracy of the forging and eliminating the need for fine processing of the tooth shape.

[0046] S4.1, cold forging grooves, pre-cold forging grooves by cold forging machine, the grooves are evenly distributed in an annular shape on the pre-spinning plane, and the grooves include inner grooves 5, middle grooves 6 and outer grooves 7 connected in sequence, and the middle grooves 6 correspond to the tooth groove positions of the forging. By pre-cold forging grooves, the uniformity of extrusion can be ensured when the tooth shape of the intermediate teeth 4 is processed later. The uniform extrusion of the cold forging grooves from the center to the outside by the intermediate teeth 4 ensures the flatness of the end face teeth to be processed, and also ensures the shape accuracy of each end face tooth.

[0047] S4.2, spin the inner groove 5, install the inner blade disc 8 on the inner side of the middle blade disc 3, similar to the shape of the middle blade disc 3, the inner blade disc 8 is annular, and its outer diameter is adapted to the inner diameter of the middle blade disc 3. The outer side of the inner blade disc 8 is evenly distributed with a number of first vertical edges 9, and the inner side of the middle blade disc 3 is evenly distributed with a number of first vertical grooves 10, the first vertical grooves 10 correspond to the first vertical edges 9 one by one, and the inner blade disc 8 and the middle blade disc 3 can be positioned in the circumferential direction. The middle blade disc 3 and the inner blade disc 8 are connected by a first locking member 11, and the two are locked by screws to prevent the inner blade disc 8 from falling off.

[0048] A plurality of inner cutter teeth 12 are evenly spaced on the lower end surface of the inner cutter disc 8, and the inner cutter teeth 12 correspond to the inner grooves 5 one by one. The cutting surface of the inner cutter teeth 12 is inclined toward the side where the middle groove 6 is located, and the inclination angle is between 2° and 10°. After the inner cutter disc 8 is installed, the spinning machine 1 is started to allow the inner cutter teeth 12 to pre-spin the inner groove 5. When the tooth groove is being processed, a guide space can be provided for the inner side of the tooth groove, so that when the intermediate tooth 4 is being processed, the side extrusion stress of the tooth groove can be released through the inner guide space, thereby ensuring the tooth shape accuracy requirement.

[0049] S4.3, spin the outer groove 7, install the outer cutter disc 13 on the outer side of the middle cutter disc 3, a number of second vertical ridges 14 are evenly distributed on the inner side of the outer cutter disc 13, a number of second vertical grooves 15 are evenly distributed on the outer side of the middle cutter disc 3, the second vertical grooves 15 correspond one to one with the second vertical ridges 14, the middle cutter disc 3 and the outer cutter disc 13 are connected by a second locking member 16; a number of outer blade teeth 17 are evenly distributed on the lower end surface of the outer cutter disc 13, the outer blade teeth 17 correspond one to one with the outer groove 7, and the blade surface of the outer blade teeth 17 is inclined toward the side where the middle groove 6 is located; after the outer cutter disc 13 is installed, start the spinning machine 1, and let the outer blade teeth 17 pre-spin the outer groove 7. Similarly, by pre-spinning the outer groove 7, a guide space can be provided for the outer side of the tooth groove when the tooth groove is processed, so that the side extrusion stress of the middle tooth 4 on the tooth groove can be released through the outer guide space during processing, thereby ensuring the tooth shape accuracy requirements. At the same time, the inner groove 5 and the outer groove 7 can also play a certain guiding role for the processed chips, thereby avoiding the residual iron chips from affecting the processing accuracy.

[0050] Step S4.4, after removing the inner cutter disc 8 and the outer cutter disc 13, the inner circle and the outer circle of the forging are trimmed by the bottom fine milling device so that the error requirement is within the tolerance range of ±0.02mm, which can further ensure the accuracy requirement of the forging.

[0051] In this embodiment, in step S5, the chip removal assembly is started to remove chips during the end face gear spinning process. The chip removal assembly includes a rotating shaft 18, a first roller 19, a second roller 20, a gear 21, a rack 22 and a reset spring 23. The rotating shaft 18 is along the extension direction of the middle tooth 4 and also along the radial direction of the forging. A column groove 24 is provided on the end face of the middle tooth 4. The rotating shaft 18 is coaxially arranged in the column groove 24 and the rotating shaft 18 is rotatably installed in the column groove 24. The rotating shaft 18 is connected to the first roller 19 and the second roller 20 at intervals. The first roller 19 and the second roller 20 are coaxially arranged. The shape of the first roller 19 and the second roller 20 is basically consistent with the column groove 24, and the surface is matched with the inner surface of the column groove 24, which can ensure that the transmission of the force of the rotating shaft 18 is reduced when the tooth shape is spun through the middle tooth 4. The inner side of the column groove 24 can also play a certain supporting role. Similarly, the design margin of the middle groove 6 can be increased. After the middle groove 6 is pre-cold forged, the bottom space of the middle groove 6 can be increased, thereby reducing the supporting effect of the bottom of the middle groove 6 on the roller and ensuring the life of the device.

[0052] The first roller 19 and the second roller 20 are respectively provided with a first spiral groove 25 and a second spiral groove 26 with opposite rotation directions. The first spiral groove 25 and the second spiral groove 26 can guide the debris. Under the rotation of the rollers, the debris can be guided out of the tooth groove. A gear 21 is connected to the middle of the rotating shaft 18. The gear 21 is meshed with a rack 22. The rack 22 is slidably arranged in a slideway 27 provided on the inner side of the middle tooth 4. The rack 22 is connected to the middle tooth 4 through a reset spring 23. When the middle tooth 4 squeezes the tooth shape of the forging, the force first acts on the rack 22, and the rack 22 moves upward and drives the gear 21 to rotate. After the gear 21 rotates, it can drive the first roller 19 and the second roller 20 to rotate. Since the first spiral groove 25 and the second spiral groove 26 have opposite rotation directions, the debris in the column groove 24 can be gradually discharged from the middle to the two ends. Under the guidance of the inner groove 5 and the outer groove 7, the debris can be discharged smoothly, reducing the retention of the debris.

[0053] In this embodiment, an annular receiving groove 28 is provided on the inner side of the middle cutter disc 3, and the annular receiving groove 28 is filled with lubricating liquid. A liquid replenishing hole 30 connected to the annular receiving groove 28 is provided on the upper end of the middle cutter disc 3. The upper end of the slideway 27 is connected to the annular receiving groove 28. A baffle 31 is fixed at the upper end opening of the slideway 27, and a guide hole 32 is provided on the baffle 31. A guide rod 33 is fixedly connected to the upper end of the rack 22, and the upper end of the guide rod 33 is slidably set in the guide hole 32. A liquid receiving groove 34 is provided in the middle of the guide rod 33, and a sponge is provided on the outer side of the guide rod 33, and the sponge is limited by the baffle 31. When the rack 22 moves up and down, the sponge 35 can be compressed, so that the lubricating liquid in the sponge 35 can be squeezed into the column groove 24, which is not only conducive to the normal extrusion process and ensures the accuracy of material removal. It can also ensure the lubrication of the rotating shaft 18, reduce the possibility of jamming, and is more conducive to chip removal.

[0054] In this embodiment, an annular air groove 36 is further provided on the inner side of the intermediate cutter disc 3, and an annular piston plate 37 is slidably provided in the annular air groove 36. The lower end of the annular piston plate 37 is connected to the rack 22 through a bracket 38. An air blowing hole 39 connected to the annular air groove 36 is provided on the inner side of the column groove 24. An air inlet hole 40 is provided on the upper end of the intermediate cutter disc 3. An air inlet flow channel corresponding to the air inlet hole 40 is provided on the lower end surface of the rivet head 2. The air inlet flow channel extends radially and corresponds to the air inlet hole 40 during installation. By providing the annular air groove 36, when the rack 22 rises, the annular piston plate 37 can be driven to move upward. When the rack 22 returns to its original position under the action of the reset spring 23, the rack 22 can drive the annular piston plate 37 to move together, and the gas in the annular air groove 36 is quickly pressed into the internal space of the column groove 24, which can not only blow away some impurities in the column groove 24, but also blow away the debris on the roller to a certain extent, reduce the residue of debris, and facilitate the discharge of debris.

[0055] In this embodiment, in step S2, the temperature range of residual temperature normalizing is 600℃~700℃. After long-term on-site processing and debugging, it is found that controlling the temperature range of normalizing within the above range can ensure that the product qualification rate is above 99%, which effectively improves the processing accuracy of forgings.

[0056] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A method for processing the end face gear of a constant speed drive half shaft housing by spinning, characterized in that: The following steps are involved: S1, warm forging the blank, extruding the raw material into the blank required for the half shaft; S2, residual temperature normalizing, using the residual temperature to pass the forging through a fixed tunnel constant temperature furnace to remove stress; S3, surface treatment, removing impurities on the surface of forgings; S4, machining end face, processing pre-spinning plane; S5, spinning production, the forging is clamped by a clamp, the pre-spinning plane faces upward, and the end face teeth are spun by a spinning machine; the output shaft of the spinning machine is connected to a rivet head, the rivet head is coaxial with the forging, the axis of the rivet head forms a certain angle a with the output shaft of the spinning machine, the rivet head is detachably connected to an intermediate cutter disc, and a plurality of intermediate teeth are evenly spaced on the lower end surface of the intermediate cutter disc; After step S4, the method further includes step S4.1, cold forging grooves, pre-cold forging grooves by a cold forging machine, wherein the grooves are evenly distributed in an annular shape on a pre-spinning plane, and the grooves include inner grooves, middle grooves and outer grooves that are connected in sequence, and the middle grooves correspond to the tooth groove positions of the forging; After step S4.1, step S4.2 is also included, that is, spinning the inner groove, installing the inner cutter disc on the inner side of the middle cutter disc, the outer side of the inner cutter disc is evenly distributed with a plurality of first vertical edges, the inner side of the middle cutter disc is evenly distributed with a plurality of first vertical grooves, the first vertical grooves correspond one-to-one to the first vertical edges, the middle cutter disc and the inner cutter disc are connected by a first locking member; a plurality of inner cutter teeth are evenly distributed on the lower end surface of the inner cutter disc, the inner cutter teeth correspond one-to-one to the inner grooves, and the blade surface of the inner cutter teeth is inclined toward the side where the middle groove is located; after the inner cutter disc is installed, the spinning machine is started to allow the inner cutter teeth to pre-spin the inner groove; After step S4.2, step S4.3 is also included, in which the outer groove is spun, and the outer side of the middle cutter disc is installed on the outer side of the middle cutter disc, the inner side of the outer cutter disc is evenly distributed with a plurality of second vertical edges, the outer side of the middle cutter disc is evenly distributed with a plurality of second vertical grooves, the second vertical grooves correspond one-to-one to the second vertical edges, and the middle cutter disc is connected to the outer cutter disc via a second locking member; a plurality of outer blade teeth are evenly spaced on the lower end surface of the outer cutter disc, the outer blade teeth correspond one-to-one to the outer grooves, and the blade surface of the outer blade teeth is inclined toward the side where the middle groove is located; after the outer cutter disc is installed, the spinning machine is started to allow the outer blade teeth to pre-spin the outer groove; After step S4.3, the method further includes step S4.4, wherein after removing the inner cutter disc and the outer cutter disc, the inner circle and the outer circle of the forging are trimmed by a bottom fine milling device so that the error requirement is within a tolerance range of ±0.02 mm.

2. The method for machining end face gear of a constant velocity drive half shaft housing by spinning according to claim 1, characterized in that: In step S5, the chip removal assembly is started to remove chips during the end face tooth spinning process. The chip removal assembly includes a rotating shaft, a first roller, a second roller, a gear, a rack and a reset spring. A column groove is provided on the end face of the middle tooth, and a rotating shaft is coaxially arranged in the column groove. The first roller and the second roller are connected to the rotating shaft at intervals. The first roller and the second roller are respectively provided with a first spiral groove and a second spiral groove with opposite rotation directions. A gear is connected to the middle part of the rotating shaft, and the gear is meshed with the rack. The rack is slidably arranged in a slideway provided on the inner side of the middle tooth, and the rack is connected to the middle tooth through a reset spring.

3. The method for machining end face gear of a constant velocity drive half shaft housing by spinning according to claim 2, characterized in that: An annular receiving groove is provided on the inner side of the intermediate blade disc, and the annular receiving groove is filled with lubricating liquid. A liquid replenishing hole connected with the annular receiving groove is provided on the upper end of the intermediate blade disc, and the upper end of the slide is connected with the annular receiving groove. A baffle is fixed at the upper end opening of the slide, and a guide hole is provided on the baffle. A guide rod is fixedly connected to the upper end of the rack, and the upper end of the guide rod is slidably arranged in the guide hole. A liquid receiving groove is provided in the middle part of the guide rod, and a sponge is provided on the outer side of the guide rod, and the sponge is limited by the baffle.

4. The method for machining the end face gear of a constant velocity drive half shaft housing by spinning according to claim 3, characterized in that: An annular air groove is also provided on the inner side of the intermediate cutter disc, in which an annular piston plate is slidably arranged, the lower end of the annular piston plate is connected to the rack through a bracket, and an air blowing hole connected to the annular air groove is provided on the inner side of the column groove, an air inlet hole is provided on the upper end of the intermediate cutter disc, and an air inlet flow channel corresponding to the air inlet hole is provided on the lower end surface of the rivet head, and the air inlet flow channel extends radially and corresponds to the air inlet hole during installation.

5. The method for machining end face gear of a constant velocity drive half shaft housing by spinning according to any one of claims 1 to 4, characterized in that: In step S2, the temperature range of the residual temperature normalizing is 600°C to 700°C.

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