A large module gear cold rolling structure and method

Abstract

The present invention discloses a large-module gear cold rolling structure and method, which includes a frame, a feeding device, a first rolling device, and a second rolling device; the first rolling device includes a first flying disc, which is rotatably mounted on the frame, and at the edge of which one or more first wheels are evenly arranged along the circumferential direction, the longitudinal cross-section of the first wheels is rectangular and is used to extrude straight grooves on a workpiece when in use; the second rolling device includes a second flying disc, which is rotatably mounted on the frame, and at the edge of which one or more first wheels are evenly arranged along the circumferential direction, the second wheels are used to extrude straight grooves on the workpiece extruded by the first rolling device into gear grooves when in use. The present invention can effectively prevent the first and second wheels from being damaged by extrusion due to excessive resistance, thereby increasing the service life of the first and second wheels, and thus effectively reducing the processing cost of the gear.

Description

Technical Field

[0001] The invention relates to a large-module gear cold rolling structure and method, belonging to the technical field of gear processing. Background Art

[0002] Gears are one of the commonly used transmission tools in the mechanical field. Their processing methods are similar to those of spline shafts. Generally, there are two types of processing: milling and extrusion. Among them, extrusion processing is more efficient in manufacturing gears and has a wider range of applications compared to milling.

[0003] A Chinese invention patent application, publication number CN107952810A, discloses a cold extrusion precision forming device and method for an external spline shaft. The device comprises a horizontally and coaxially arranged main shaft, a spline shaft, and a top plate. The spline shaft is sleeved on the main shaft, fixedly connected to the main shaft, and capable of rotating synchronously with the main shaft. The outer wall of the spline shaft is provided with a processing area for extruding the external spline shape. The external splines are evenly distributed along the circumference of the spline shaft, and each external spline is arranged along the length of the spline shaft. A flywheel is symmetrically arranged on both sides of the processing area, and a roller is provided on the outer wall of the flywheel. The technical solution disclosed in the above invention patent is that the roller rolls on the spline shaft once for each rotation of the spline shaft, directly rolling out the spline groove on the spline shaft. This processing method is more damaging to the roller due to the large resistance between the roller and the spline shaft. The roller is easily damaged by the large extrusion resistance, and the roller needs to be replaced frequently, resulting in high processing costs for the spline shaft. Therefore, it is not suitable for gear processing.

[0004] The Chinese invention patent with application publication number CN114798785A provides a cold-rolled extra-long spline shaft device, including a frame, a main shaft, a flywheel and a vertical support plate; the main shaft is arranged on the frame; there are two flywheels and they are rotatably mounted on the frame, the two flywheels are symmetrically arranged on the left and right sides of the main shaft center line, and multiple wheels are evenly arranged on the edges of the flywheels along the circumferential direction. The wheels on the two flywheels are used to extrude spline grooves on the workpiece when in use; the vertical support plate is arranged on the end of the frame away from the main shaft, and a limiting through hole is opened on the vertical support plate through both sides thereof, the center line of the limiting through hole and the center line of the main shaft are on the same horizontal line, a spring clip is arranged in the limiting through hole through a bearing, and the end of the workpiece away from the main shaft cooperates with the spring clip, and the spring clip is used to prevent the radial swing of the end of the workpiece. The device for preparing spline shafts disclosed in this patent is the same as the device disclosed in the invention with application publication number CN107952810A. The spline groove is extruded on the workpiece at one time. The resistance between the wheel and the workpiece is large, and the wheel is easily damaged by extrusion, which is not conducive to the processing of spline shafts and gears.

[0005] Therefore, the current extrusion processing method used to process spline shafts and gears has a large resistance between the workpiece and the wheel, and the wheel is easily damaged by extrusion, and the wheel needs to be replaced from time to time, which makes it difficult to effectively reduce the processing cost of spline shafts and gears. Summary of the Invention

[0006] One of the purposes of the present invention is to provide a large-module gear cold rolling structure to solve the technical defects in the prior art in which the gear groove is extruded and formed by a wheel in one step, the workpiece has a large resistance to the wheel, and the wheel is easily damaged.

[0007] In order to solve the above problems, the technical solution adopted by the present invention is: a large-module gear cold rolling structure, comprising a frame, a feeding device, one or more first rolling devices and a second rolling device arranged at intervals along the length direction of the workpiece to be processed, the feeding device being installed at one end of the frame, and the feeding device pushing the workpiece to be processed into an involute spline forward when in use, and driving the workpiece to be processed to rotate; the first rolling device comprises a first flying disc, the first flying disc is rotatably arranged on the frame, the center line of the first flying disc is arranged in the vertical direction and the first flying disc is driven by the first flying disc driving motor to rotate relative to the frame, and one or more first wheels are evenly arranged at the edge of the first flying disc in the circumferential direction, and the center line direction of the first wheel is parallel to the first flying disc. The center line direction of the second wheel is parallel to that of the second wheel, and the longitudinal section of the first wheel is rectangular, which is used to extrude a straight groove on the workpiece when in use; the second rolling device is located on a side away from the feeding device, and the second rolling device includes a second flying disc, which is rotatably arranged on the frame, and the center line of the second flying disc is arranged in the vertical direction and the second flying disc is driven by the second flying disc driving motor to rotate synchronously with the first flying disc on the frame, and more than one first wheel is evenly arranged at the edge of the second flying disc in the circumferential direction, and the center line direction of the second wheel is parallel to the center line direction of the second flying disc, and the longitudinal section shape of the edge of the second wheel is the same as the cross-sectional shape of the tooth groove of the gear to be processed, and is used to extrude the straight groove extruded by the first rolling device on the workpiece into a gear groove when in use. The present invention sets more than one first rolling device, first extrudes a straight groove on the surface of the workpiece, and the straight grooves extruded by multiple first rolling devices are gradually deepened, and finally the straight grooves are extruded by the second rolling device to form gear grooves. The present invention first extrudes the straight grooves and then extrudes the straight grooves into gear grooves. During the process of extruding the straight grooves and extruding the gear grooves, the resistance of the workpiece to the first and second wheels is smaller than the resistance of the prior art in which the gear grooves are directly extruded by the wheels. This can effectively prevent the first and second wheels in the present invention from being extruded and damaged due to excessive resistance, thereby increasing the service life of the first and second wheels in the present invention, and thus effectively reducing the processing cost of the gears.

[0008] As a further improvement to the present invention, each first rolling device includes one first disc, which is positioned on one side of the workpiece and is used to extrude a straight groove in the workpiece from one side. A second disc is also positioned on one side of the workpiece and is used to extrude the straight groove extruded by the first disc into a gear groove from one side of the workpiece. In the present invention, each first rolling device and second rolling device extrude the workpiece from one side. For each angle the workpiece rotates, the first rolling device and the second rolling device extrude a straight groove or a gear groove, respectively. Therefore, the present invention is suitable for machining gears with both odd and even numbers of gear grooves.

[0009] As a further improvement of the present invention, the first rolling device also includes a first flying disc mounting frame and a first mounting frame driving motor, the first flying disc mounting frame is slidably mounted on the frame, the first flying disc is rotatably mounted on the first flying disc mounting frame, and moves synchronously with the movement of the first flying disc mounting frame; the first mounting frame driving motor is mounted on the frame, and is used to drive the first flying disc mounting frame to move on the frame toward or away from the workpiece, and is used to adjust the distance between the first wheel and the center line of the workpiece according to the diameter of the gear to be processed; the second rolling device also includes a second flying disc mounting frame and a second mounting frame driving motor, the second flying disc mounting frame is slidably mounted on the frame, the second flying disc is rotatably mounted on the second flying disc mounting frame, and moves synchronously with the movement of the second flying disc mounting frame; the second mounting frame driving motor is mounted on the frame, and is used to drive the second flying disc mounting frame to move on the frame toward or away from the workpiece, and is used to adjust the distance between the second wheel and the center line of the workpiece according to the diameter of the gear to be processed, so that the position of the second wheel corresponds to the straight groove extruded by the first wheel. The first rolling device and the second rolling device in the present invention can both be moved on the frame, and the positions of the first rolling device and the second rolling device can be moved according to the diameter of the gear to be processed, so that the present invention is suitable for processing gears of different diameters, thereby improving the versatility of the present invention.

[0010] As a further improvement of the present invention, a baffle is further included, the number of which is equal to the sum of the first rolling device and the second rolling device, a baffle is provided on the other side of each of the first rolling device and the second rolling device, the baffle is slidably provided on the frame, and is driven by the baffle driving motor to move toward or away from the workpiece, so as to prevent the first and second wheels from bending and deforming the workpiece in a direction away from the first and second wheels when the workpiece is squeezed. The present invention provides a baffle to block the workpiece from the side away from the first and second rolling devices, thereby preventing the workpiece from bending and deforming due to the squeezing of the first and second rolling devices during the process of being processed into a gear, thereby improving the quality of the gear processed by the present invention.

[0011] As a further improvement to the present invention, a circular arc groove is provided on one side of the retaining frame for contact with the workpiece. When in use, the workpiece rests within the circular arc groove. By providing the circular arc groove on the retaining frame, the present invention reduces the width of the retaining frame while also increasing the contact area between the workpiece and the retaining frame, thereby reducing damage to the workpiece surface caused by compression between the retaining frame and the workpiece.

[0012] As a further improvement of the present invention, the retaining ring is rotatably disposed within the circular arc groove, and the workpiece passes through the retaining ring and abuts against the retaining ring. When the workpiece rotates, the retaining ring rotates within the circular arc groove accordingly. The present invention provides the retaining ring, and through the relative rotation of the retaining ring and the retaining frame, the retaining ring rotates relative to the retaining frame simultaneously with the workpiece rotation, thereby further reducing the resistance of the retaining ring to the workpiece during the rotation of the workpiece, thereby avoiding the impact on the surface quality of the workpiece caused by excessive resistance.

[0013] As a further improvement of the present invention, a retaining frame corresponding to the second rolling device is located on a side away from the feeding device. A retaining ring on the retaining frame is provided with an internal spline. The module of the internal spline is equal to the module of the gear extruded by the second rolling device. The teeth extruded by the second rolling device mesh with the internal splines on the retaining ring. In the present invention, the retaining ring on the side of the retaining frame located away from the feeding device is provided with an internal spline. In this way, the portion that has been processed into a gear meshes with the internal splines on the retaining ring, thereby further reducing damage caused by the retaining ring to the workpiece.

[0014] As a further improvement of the present invention, the number of first flying discs in each first rolling device is two, and the two first flying discs are symmetrically arranged on both sides of the workpiece, respectively used to extrude straight grooves on the workpiece from both sides of the workpiece; the number of second flying discs is two, and the two second flying discs are symmetrically arranged on both sides of the workpiece, respectively used to extrude the straight grooves extruded by the first flying discs into gear grooves from both sides of the workpiece. The present invention provides first and second flying discs on both sides of the workpiece, so straight grooves and gear grooves can be extruded on both sides of the workpiece simultaneously. Compared with extruding the workpiece from a single side, the present invention reduces the gear processing time by half, greatly improving the gear processing efficiency. Compared with extruding the workpiece from a single side, the present invention symmetrically extrudes the workpiece from both sides, so the present invention is only suitable for processing gears with an even number of teeth.

[0015] As a further improvement of the present invention, the first rolling device also includes two first flying disc mounting frames and a first mounting frame driving motor, the two first flying disc mounting frames are symmetrically arranged on both sides of the workpiece, and the two second flying disc mounting frames are slidably arranged on the frame, and the two first flying discs are respectively rotatably arranged on the two first flying disc mounting frames; the first mounting frame driving motor is installed on the frame for driving the first flying disc mounting frame to move toward or away from the workpiece, and the two first flying disc mounting frames move synchronously toward the workpiece, or synchronously move toward and away from the workpiece; the second rolling device also includes two second flying disc mounting frames and a second mounting frame driving motor, the two second flying disc mounting frames are slidably arranged on the frame and symmetrically arranged on both sides of the workpiece, and the two second flying discs are respectively rotatably mounted on the two second flying disc mounting frames; the second mounting frame driving motor is installed on the frame for driving the second flying disc mounting frame to move on the frame toward or away from the workpiece, and the two second flying disc mounting frames move synchronously toward the workpiece, or synchronously move toward and away from the workpiece. In the present invention, the two first flying discs on the first rolling device move synchronously in opposite or opposite directions at the same time, and the second flying disc on the second rolling device moves synchronously in opposite or opposite directions at the same time. As a result, the positions of the first flying disc and the second flying disc can be adjusted according to the gears of different diameters to be processed, thereby increasing the diameter range of the gears processed by the present invention and improving the versatility of the present invention.

[0016] Another object of the present invention is to provide a method for cold rolling large-module gears to solve the technical defects in the prior art in that the tooth grooves of the gears are formed by one-time extrusion of the wheel, the resistance between the workpiece and the wheel is large, and the wheel is easily damaged.

[0017] To solve the above problems, the technical solution adopted by the present invention is: a method for cold rolling a large module gear, comprising the following steps:

[0018] Step 1: First, a straight groove C1 with a depth of D1 and a width of W1 is rolled out on the workpiece.

[0019] Step 2: Roll out a straight groove C2 with a depth of D2 and a width of W2 on the basis of the straight groove C1, and D2>D1, W2<W1, and the distances between the two sides of the bottom of the straight groove C2 and the two sides of the straight groove C1 are equal.

[0020] Step 3, repeat step 2 until a straight groove Cn with a depth Dn and a width Wn is extruded on the workpiece, where n is an integer greater than or equal to 2.

[0021] Step 4: extrude the straight groove Cn into a gear groove to complete the gear processing.

[0022] The present invention first extrude a straight groove on the workpiece, and then extrude the straight groove on the basis of the straight groove already extruded on the workpiece to extrude the straight groove into a gear groove. The present invention has a small resistance to extruding the workpiece each time, thereby avoiding damage caused by excessive resistance to the wheel, improving the service life of the equipment for processing the gear, and reducing the processing cost of the gear.

[0023] To sum up, the beneficial effects of the present invention are as follows: when the present invention is used to process gears, straight grooves are first processed on the workpiece in sequence, and then the straight grooves are extruded to form gear grooves. Compared with using a wheel to extrude the gear grooves on the workpiece in one go, the resistance between the first wheel and the second wheel and the workpiece in the present invention is smaller, which reduces the damage to the first wheel and the second wheel, improves the service life of the present invention, and thus reduces the processing cost of the gear. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a top view of embodiment 1 of the present invention.

[0025] Figure 2 It is a schematic diagram of the three-dimensional structure of Example 1 of the present invention.

[0026] Figure 3 It is a schematic diagram of the three-dimensional structure of embodiment 1 of the present invention from another angle.

[0027] Figure 4 yes Figure 3 A partial enlarged view of point A in the middle.

[0028] Figure 5 It is a top view of embodiment 2 of the present invention.

[0029] Figure 6 It is a schematic diagram of the three-dimensional structure of Example 2 of the present invention.

[0030] Figure 7 It is a schematic diagram of the three-dimensional structure of embodiment 2 of the present invention from another angle.

[0031] Figure 8 yes Figure 7 A partial enlarged view of point B in the middle.

[0032] Figure 9 Schematic diagram of the changes in the groove during gear processing in Example 3 of the present invention.

[0033] Among them: 1. frame; 2. first rolling device; 3. first flying disc; 4. first flying disc drive motor; 5. first wheel; 6. second rolling device; 7. second flying disc; 8. second flying disc drive motor; 9. second wheel; 10. first flying disc mounting frame; 11. first mounting frame drive motor; 12. second flying disc mounting frame; 13. second mounting frame drive motor; 14. baffle; 15. baffle drive motor; 16. arc groove; 17. baffle ring; 18. feeding device; 19. first guide rail; 20. first slider; 21. first screw rod; 22. second guide rail; 23. second slider; 24. second screw rod; 25. third guide rail; 26. third slider; 27. third screw rod; 28. fixing sleeve. DETAILED DESCRIPTION

[0034] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. Example 1

[0035] like Figures 1 to 4 The large-module gear cold rolling structure shown includes a frame 1, a feeding device 18, a first rolling device 2, and a second rolling device 6; the feeding device 18 is installed at one end of the frame 1. When in use, the feeding device 18 pushes the workpiece to be processed into an involute spline forward and drives the workpiece to be processed to rotate. The feeding device 18 in this embodiment is a prior art, as disclosed in the Chinese invention patent application publication number CN114798785A. Its structure and usage can be referred to the above patent application publication documents, and will not be described in detail in this embodiment.

[0036] In this embodiment, the number of the first rolling device 2 is more than one, and the more than one first rolling device 2 is arranged at equal intervals along the length direction of the workpiece to be processed. The first rolling device 2 is provided with a first flying disc 3, and the first flying disc 3 is rotatably arranged on the frame 1 through a rotating shaft that does not rotate relative to it. The center line of the first flying disc 3 is arranged in the vertical direction, and the first flying disc 3 is driven by the first flying disc drive motor 4 to rotate relative to the frame 1. At the edge of the first flying disc 3, there are more than one first beating wheel 5 evenly arranged in the circumferential direction. The first beating wheel 5 is rotatably mounted on the first flying disc 3 using a rotating shaft that does not rotate relative to it. In this embodiment, a first mounting groove equal to the number of the first beating wheels 5 is evenly opened in the circumferential direction on the cylindrical surface of the edge of the first flying disc 3. The first wheel 5 is rotatably installed in the first mounting groove through a rotating shaft. One side of the first wheel 5 extends out of the first mounting groove to contact and squeeze the workpiece when in use. The center line direction of the first wheel 5 is parallel to the center line direction of the first flying disc 3, that is, the center line of the first wheel 5 in this embodiment is also set along the vertical direction. The longitudinal section of the first wheel 5 is rectangular and is used to extrude a straight groove on the workpiece when in use. When the number of first rolling devices 2 in this embodiment exceeds one, the first wheel 5 on the first flying disc 3 farther away from the feeding device 18 has a larger diameter and a smaller thickness. In this way, the width of the straight groove extruded on the workpiece is smaller and the depth is greater. The straight groove extruded by the latter first wheel 5 forms a step at the bottom of the straight groove extruded by the previous first wheel 5.

[0037] In this embodiment, the second rolling device 6 is located on a side away from the feeding device 18. The second rolling device 6 is provided with a second flying disc 7. The second flying disc 7 is rotatably arranged on the frame 1 through a rotating shaft that does not rotate relative to the second flying disc 7. The center line of the second flying disc 7 is arranged in the vertical direction, and the second flying disc 7 is driven by the second flying disc drive motor 8 to rotate synchronously with the first flying disc 3 on the frame 1, that is, the angular velocity of the second flying disc 7 in this embodiment is equal to the angular velocity of the first flying disc 3. At the edge of the second flying disc 7, more than one second wheel 9 is evenly arranged along the circumferential direction. In this embodiment, the second flying disc 7 is provided with a second wheel. The number of wheels 9 is equal to the number of first wheels 5 provided on each first flying disc 3. In this embodiment, second mounting grooves equal to the number of second wheels 9 are uniformly opened along the circumferential direction on the cylindrical surface of the second flying disc 7. The second wheels 5 are rotatably installed in the second mounting grooves through the rotating shaft. The centerline direction of the second wheels 9 is parallel to the centerline direction of the second flying disc 7, that is, the centerline direction of the second wheels 9 is arranged in the vertical direction. The longitudinal cross-sectional shape of the edge of the second wheels 9 is the same as the cross-sectional shape of the tooth groove of the gear to be processed, and is used to extrude the straight groove extruded by the first rolling device 2 on the workpiece into a gear groove when in use.

[0038] In this embodiment, the number of the first flying disc 3 in each first rolling device 2 is one, and the one first flying disc 3 is located on one side of the workpiece, and is used to extrude a straight groove on the workpiece from one side of the workpiece; accordingly, the number of the second flying disc 7 in this embodiment is one, and the second flying disc 7 is also located on one side of the workpiece, and is used to extrude the straight groove extruded by the first flying disc 3 into a gear groove from one side of the workpiece, and all the first flying discs 3 and the second flying discs 7 in this embodiment are located on the same side of the workpiece. In this embodiment, every time the workpiece rotates an angle, the first wheel 5 on the first flying disc 3 and the second wheel 9 on the second flying disc 7 can only extrude a straight groove or a gear groove from one side of the workpiece. Therefore, this embodiment can be applied to the processing of gears with an odd number of gear grooves, and can also be applied to the processing of gears with an even number of gear grooves.

[0039] In order to make this embodiment applicable to the processing of gears of different diameters, the first rolling device 2 in this embodiment further includes a first flying disc mounting frame 10 and a first mounting frame driving motor 11. The first flying disc mounting frame 10 is slidably arranged on the frame 1. In this embodiment, two first guide rails 19 are detachably mounted on the frame 1 along a direction perpendicular to the length direction of the workpiece using bolts. The two first guide rails 19 are parallel and located on one side of the workpiece. A first slider 20 is detachably mounted on the bottom of the first flying disc mounting frame 10 using bolts. The first slider 20 is detachably mounted on the first guide rail 1. 9 slidingly cooperates, and the relative sliding of the second slider 20 and the first guide rail 19 realizes the relative sliding of the first flying disc mounting frame 10 and the frame 1. The first flying disc 3 in this embodiment is rotatably mounted on the first flying disc mounting frame 10 and moves synchronously with the movement of the first flying disc mounting frame 10. The first flying disc drive motor 4 in this embodiment is detachably mounted on the upper portion of the first flying disc mounting frame 10 using bolts. The output shaft of the first flying disc drive motor 4 is vertically downwardly arranged and connected to the top of the rotating shaft of the first flying disc 3 using a coupling to drive the first flying disc 3 to rotate.

[0040] In this embodiment, the first mounting frame drive motor 11 is detachably mounted on the frame 1 with bolts, and is used to drive the first flying disc mounting frame 10 to move toward or away from the workpiece on the frame 1. In this embodiment, a first fixed block is fixedly provided at the bottom of the first flying disc mounting frame 10, and a first screw rod 21 is provided on the frame 1 between the two first guide rails 19. The first screw rod 21 is parallel to the first guide rail 19, and the first screw rod 21 passes through the first fixed block and is threadedly engaged with the first fixed block. A bearing seat is provided at each end of the first screw rod 21 for rotationally connecting to the frame 1, and one end of the first screw rod 21 is connected to the output shaft of the first mounting frame drive motor 11 by a coupling. The horizontal movement of the first flying disc mounting frame 10 is used to adjust the distance between the first wheel 5 and the center line of the workpiece according to the diameter of the gear to be processed. In this embodiment, the first mounting frame drive motor 11 drives the first screw rod 21 to rotate, and the rotation of the first screw rod 21 is converted into horizontal movement of the first fixed block, thereby driving the horizontal sliding of the entire first flying disc mounting frame 10. In this embodiment, when processing a gear with a larger diameter, the first mounting frame driving motor 11 drives the first flying disc mounting frame 10 to move in a direction away from the center line of the workpiece to increase the distance between the first bend wheel 5 and the center line of the workpiece. When processing a gear with a smaller diameter, the first mounting frame driving motor 11 drives the first flying disc mounting frame 10 to move in a direction close to the center line of the workpiece to reduce the distance between the first bend wheel 5 and the center line of the workpiece.

[0041] In order to adapt to the distance adjustment between the first rolling device 2 and the workpiece, the second rolling device 6 in this embodiment further includes a second flying disc mounting frame 12 and a second mounting frame driving motor 13. The second flying disc mounting frame 12 is slidably arranged on the frame 1. In this embodiment, two second guide rails 22 are provided on the frame 1 along a direction perpendicular to the workpiece. The two second guide rails 22 are parallel and detachably connected to the frame 1 by bolts. A second slider 23 is detachably mounted on the bottom of the second flying disc mounting frame 12 by bolts. The second slider 23 cooperates with the second guide rail 22. The relative sliding of the second slider 23 and the second guide rail 22 realizes the horizontal sliding of the second flying disc mounting frame 12 on the frame 1. The second flying disc 7 in this embodiment is rotatably mounted on the second flying disc mounting frame 12 and moves synchronously with the movement of the second flying disc mounting frame 12. The second mounting frame driving motor 13 in this embodiment is detachably mounted on the frame 1 by bolts, and is used to drive the second flying disc mounting frame 12 to move on the frame 1. To move toward or away from the workpiece, in this embodiment, a second screw rod 24 is provided on the frame 1 between the two second guide rails 22, and the second screw rod 24 is parallel to the second guide rails 22. A bearing seat is provided at each end of the second screw rod 24 so that the two ends of the second screw rod 24 are rotatably connected to the frame 1, and a second fixed block is fixedly provided at the bottom of the second flying disc mounting frame 12. The second screw rod 24 passes through the second fixed block and is threadedly engaged with the second fixed block. One end of the second screw rod 24 is connected to the output shaft of the second mounting frame drive motor 13 by a coupling, and the second mounting frame drive motor 13 drives the second screw rod 24 to rotate, and the second screw rod 24 converts its rotation into horizontal movement of the second fixed block, thereby realizing the overall movement of the second flying disc mounting frame 12. In this embodiment, the horizontal movement of the second flying disc mounting frame 12 is used to adjust the distance between the second dredging wheel 9 and the center line of the workpiece according to the diameter of the gear to be processed, so that the position of the second dredging wheel 9 corresponds to the straight groove extruded by the first dredging wheel 5.

[0042] In this embodiment, since the first wheel 5 and the second wheel 9 extrude the workpiece from the same side of the workpiece, the workpiece is easily bent and deformed in the direction away from the first wheel 5 and the second wheel 9 due to uneven force on both sides during the process of being processed into a gear. In order to avoid this bending deformation, a baffle 14 is provided in this embodiment, and the number of baffles 14 is equal to the sum of the first rolling device 2 and the second rolling device 6, that is, in this embodiment, each of the first rolling device 2 and the second rolling device 6 is provided with a baffle 14 on the other side, and in this embodiment, the baffle 14 is aligned with the first rolling device 2 and The second rolling device 6 is staggered at a small distance along the length direction of the workpiece, and the distance is based on the fact that the baffle 14 does not affect the first wheel 5 and the second wheel 9 in squeezing the workpiece. The baffle 14 in this embodiment is slidably set on the frame 1 and is driven by the baffle drive motor 15 to move toward or away from the workpiece. In this embodiment, a third guide rail 25 is set on the frame 1 in a direction perpendicular to the workpiece, and a third slider 26 is detachably installed at the bottom of the baffle 14 with bolts. The third slider 26 cooperates with the third guide rail 25. In this embodiment, two bolts are set at the bottom of each baffle 14 The parallel third guide rail 25 realizes the relative sliding of the blocking frame 14 and the frame 1 through the relative sliding of the third slider 26 and the third guide rail 25. In this embodiment, a third screw rod 27 parallel to the third guide rail 25 is provided between the two third guide rails 25. A bearing seat is provided at each end of the third screw rod 27 to enable the third screw rod 27 to rotate relative to the frame 1. A third fixing seat is fixedly provided at the bottom of the blocking frame 14. The third screw rod 27 passes through the third fixing seat and is threadedly engaged with the third fixing seat. One end of the third screw rod 27 is coupled to the output shaft of the blocking frame drive motor 15. The baffle frame 14 is connected to the machine frame 1, and the baffle frame driving motor 15 in this embodiment is detachably mounted on the machine frame 1 by bolts. The baffle frame driving motor 15 drives the third screw rod 27 to rotate, and the third screw rod 27 converts its rotation into horizontal movement of the third fixed block, thereby driving the baffle frame 14 to slide horizontally relative to the machine frame 1 as a whole. The baffle frame 14 in this embodiment is used to prevent the first and second wheels 5, 9 from bending and deforming the workpiece in a direction away from the first and second wheels 5, 9 when the workpiece is squeezed. The horizontal sliding of the baffle frame 14 can appropriately adjust the position of the baffle frame 14 according to the diameter of the gear to be processed.

[0043] In this embodiment, the best side of the retaining frame 14 for abutting against the workpiece is provided with an arc groove 16. In the use state, the workpiece abuts against the arc groove 16. In this embodiment, a retaining ring 17 is preferably provided, which is rotatably arranged in the arc groove 16. The workpiece passes through the retaining ring 17 and abuts against the retaining ring 17. When the workpiece rotates, the retaining ring 17 rotates in the arc groove 16. In this embodiment, a fixing sleeve 28 is further welded and fixed in the arc handle 16. The retaining ring 17 is rotatably arranged in the fixing sleeve 28 using a bearing to radially limit the retaining ring 17. The inner diameter of the retaining ring 17 in this embodiment is larger than the diameter of the gear to be processed. When the workpiece rotates, the retaining ring 17 rotates relative to the fixing sleeve 28 in the fixing sleeve 28 to reduce the resistance of the retaining ring 17 to the rotation of the workpiece. In this embodiment, the retaining frame 14 corresponding to the second rolling device 6 is located on the side away from the feeding device 18. The retaining ring 17 on the retaining frame 14 is provided with an internal spline, the module of the internal spline is equal to the module of the gear extruded by the second rolling device 6, and the teeth extruded by the second rolling device 6 are meshed with the internal spline on the retaining ring 17. Example 2

[0044] This embodiment is a further improvement made on the basis of embodiment 1. Compared with embodiment 1, the number of first flying discs 3 in each first rolling device 2 in this embodiment is two, and the two first flying discs 3 are symmetrically arranged on both sides of the workpiece. Figures 5 to 8As shown, they are respectively used to extrude straight grooves on the workpiece from both sides of the workpiece; the first rolling device 2 in this embodiment also includes a first flying disc mounting frame 10 and a first mounting frame driving motor 11, the number of the first flying disc mounting frames 10 is two, the two first flying disc mounting frames 10 are symmetrically arranged on both sides of the workpiece, and the two second flying disc mounting frames 12 are both slidably arranged on the frame 1, and the two first flying discs 3 are respectively rotatably arranged on the two first flying disc mounting frames 10. In this embodiment, a first guide rail 19 perpendicular to the workpiece is detachably mounted on the frame 1 using bolts. When in use, the workpiece is located on the first guide rail 1 9, and the two ends of the first guide rail 19 are respectively located on both sides of the workpiece. A first slider 20 is detachably mounted on the bottom of the first flying disc mounting frame 10 using bolts. The first slider 20 cooperates with the first guide rail 19, and in this embodiment, the first sliders 20 at the bottom of the two first flying disc mounting frames 10 of each first rolling device 2 respectively cooperate with the two ends of the first guide rail 19 to slide horizontally relative to the first guide rail 19 on both sides of the workpiece. The first mounting frame drive motor 11 is detachably mounted on the frame 1 using bolts to drive the first flying disc mounting frame 10 to move toward or away from the workpiece. The two first flying disc mounting frames 10 move synchronously toward the direction of the workpiece, or synchronously move toward and away from the workpiece. In this embodiment, a first screw rod 21 parallel to the first guide rail 19 is provided between the two first guide rails 19. A bearing seat is provided at each end of the first screw rod 21 to be rotatably connected to the frame 1. In this embodiment, the threads at both ends of the first screw rod 21 are rotated in opposite directions. One end of the first screw rod 21 is connected to the output shaft of the first mounting frame drive motor 11 by a coupling. A first fixing block is fixedly provided at the bottom of the first flying disc mounting frame 10. The two ends of the first screw rod 21 pass through the first fixing block respectively. The first fixed blocks at the bottom of the two first disc mounting frames 10 of a rolling device 2 are respectively threadedly engaged with the first fixed blocks at both ends. In this embodiment, the first mounting frame drive motor 11 drives the first screw rod 21 to rotate, converting the rotation of the first screw rod 21 into horizontal movement of the two first fixed blocks, and ultimately driving the two first disc mounting frames 10 to slide horizontally on the frame 1. Since the threads at both ends of the first screw rod 21 have opposite rotation directions, the two first disc mounting frames 10 in this embodiment move in opposite directions, that is, the two first disc mounting frames 10 slide toward each other or away from each other synchronously.

[0045] In this embodiment, the number of the second flying discs 7 is two, and the two second flying discs 7 are symmetrically arranged on both sides of the workpiece, and are respectively used to extrude the straight grooves extruded by the first flying disc 3 into gear grooves from both sides of the workpiece; the second rolling device 6 in this embodiment includes two second flying disc mounting frames 12 and a second mounting frame driving motor 13, the two second flying disc mounting frames 12 are slidably arranged on the frame 1 and symmetrically arranged on both sides of the workpiece, and the two second flying discs 7 are respectively rotatably mounted on the two second flying disc mounting frames 12, and the second mounting frame driving motor 13 in this embodiment is mounted on the frame 1, and is used to drive the second flying disc mounting frames 12 to move toward or away from the workpiece on the frame 1, and the two second flying disc mounting frames 12 move synchronously toward the workpiece, or move synchronously toward and away from the workpiece. In this embodiment, the structure of the second mounting frame driving motor 13 driving the second flying disc mounting frames 12 is the same as the structure of the first mounting frame driving motor 11 driving the two first flying disc mounting frames 10. For details, please refer to it, and this embodiment will not be repeated. Because the first and second truncation wheels 5 and 9 of this embodiment symmetrically squeeze the workpiece from both sides, the force on both sides of the workpiece is relatively uniform, eliminating the need for a retaining frame 14 as in Example 1. Since two straight grooves or gear grooves are symmetrically squeezed into the workpiece with each rotation of the workpiece, this embodiment is suitable for machining gears with an even number of tooth grooves, but not for machining gears with an odd number of tooth grooves. The remaining structure of this embodiment is the same as that of Example 1, and reference may be made to Example 1 for details, which will not be described in detail in this embodiment. Example 3

[0046] This embodiment is a method for cold rolling a large-module gear, using the large-module gear cold rolling structure of embodiment 1 or embodiment 2. This embodiment includes the following steps:

[0047] Step 1: When the workpiece is transported from the conveying device to the first rolling device 2, the first rolling device 2 rolls a straight groove C1 with a depth of D1 and a width of W1 on the workpiece. Figure 9 shown.

[0048] Step 2. When the conveying device conveys the workpiece to the second first rolling device 2, the second first rolling device 2 rolls out a straight groove C2 with a depth of D2 and a width of W2 on the basis of the straight groove C1, and D2>D1, W2<W1, and the distance between the two sides of the bottom of the straight groove C2 is equal to the distance between the two sides of the straight groove C1.

[0049] In step 3, the conveying device continues to convey the workpiece through all the first rolling devices 2, and step 2 is repeated by other second rolling devices 2 until the workpiece passes through all the second rolling devices 2, and the last second rolling device 2 extrude a straight groove Cn with a depth Dn and a width Wn on the workpiece, where n is an integer greater than or equal to 2, that is, n is the number of first rolling devices 2 in this embodiment.

[0050] In step 4, the conveying device continues to convey the workpiece forward, extruding the straight groove Cn in step 3 into the final gear groove, completing the gear processing.

[0051] Any portion of the above description not specifically described herein is prior art or can be implemented using prior art. Furthermore, the specific embodiments described herein are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. In other words, any equivalent variations and modifications made within the scope of the present invention's patent application should be considered within the technical scope of the present invention.

Claims

1. A large module gear cold rolling structure, comprising Rack (1); A feeding device (18), the feeding device (18) is installed at one end of the frame (1), and the feeding device (18) pushes the workpiece to be processed into the involute spline forward when in use, and drives the workpiece to be processed to rotate; Its characteristics are: Also includes More than one first rolling device (2) is arranged at intervals along the length direction of the workpiece to be processed, the first rolling device (2) includes a first flying disc (3), the first flying disc (3) is rotatably arranged on the frame (1), the center line of the first flying disc (3) is arranged along the vertical direction and the first flying disc (3) is driven by the first flying disc driving motor (4) to rotate relative to the frame (1), more than one first beating wheel (5) is evenly arranged along the circumferential direction at the edge of the first flying disc (3), the center line direction of the first beating wheel (5) is parallel to the center line direction of the first flying disc (3), the longitudinal section of the first beating wheel (5) is rectangular and is used to extrude a straight groove on the workpiece in a use state, when the number of the first rolling device (2) exceeds one, the first beating wheel (5) on the first flying disc (3) farther away from the feeding device (18) has a larger diameter and a smaller thickness, and the straight groove extruded on the workpiece has a smaller width and a larger depth, and the straight groove extruded by the latter first beating wheel (5) forms a step at the bottom of the straight groove extruded by the former first beating wheel (5); The second rolling device (6) is located on a side away from the feeding device (18), and the second rolling device (6) includes a second flying disc (7), which is rotatably arranged on the frame (1), the center line of the second flying disc (7) is arranged in a vertical direction, and the second flying disc (7) is driven by a second flying disc driving motor (8) to rotate synchronously with the first flying disc (3) on the frame (1), and one or more second beating wheels (9) are evenly arranged at the edge of the second flying disc (7) along the circumferential direction, the center line direction of the second beating wheel (9) is parallel to the center line direction of the second flying disc (7), and the longitudinal cross-sectional shape of the edge of the second beating wheel (9) is the same as the cross-sectional shape of the tooth groove of the gear to be processed, and is used to extrude the straight groove extruded by the first rolling device (2) on the workpiece into a gear groove in a use state.

2. The large module gear cold rolling structure according to claim 1, characterized in that: The number of the first flying disc (3) in each first rolling device (2) is one, and the first flying disc (3) is located on one side of the workpiece and is used to extrude a straight groove on the workpiece from one side of the workpiece; The number of the second flying disc (7) is one, and the second flying disc (7) is located on one side of the workpiece and is used to extrude the straight groove extruded by the first flying disc (3) into a gear groove from one side of the workpiece.

3. The large module gear cold rolling structure according to claim 2, characterized in that: The first rolling device (2) also includes A first flying disc mounting frame (10), wherein the first flying disc mounting frame (10) is slidably mounted on the frame (1), and the first flying disc (3) is rotatably mounted on the first flying disc mounting frame (10) and moves synchronously with the movement of the first flying disc mounting frame (10); a first mounting frame drive motor (11), the first mounting frame drive motor (11) being mounted on the frame (1) and being used to drive the first flying disc mounting frame (10) to move on the frame (1) toward or away from the workpiece, and being used to adjust the distance between the first wheel (5) and the centerline of the workpiece according to the diameter of the gear to be machined; The second rolling device (6) also includes A second flying disc mounting frame (12), the second flying disc mounting frame (12) is slidably mounted on the frame (1), and the second flying disc (7) is rotatably mounted on the second flying disc mounting frame (12) and moves synchronously with the movement of the second flying disc mounting frame (12); A second mounting frame drive motor (13) is mounted on the frame (1) and is used to drive the second flying disc mounting frame (12) to move on the frame (1) toward or away from the workpiece, and is used to adjust the distance between the second beating wheel (9) and the center line of the workpiece according to the diameter of the gear to be processed, so that the position of the second beating wheel (9) corresponds to the straight groove extruded by the first beating wheel (5).

4. The large module gear cold rolling structure according to claim 3, characterized in that: The machine also includes a baffle (14), the number of which is equal to the total number of the first rolling device (2) and the second rolling device (6), and a baffle (14) is provided on the other side of each of the first rolling device (2) and the second rolling device (6), the baffle (14) being slidably provided on the frame (1) and driven by a baffle drive motor (15) to move toward or away from the workpiece, so as to prevent the first wheel (5) and the second wheel (9) from bending and deforming the workpiece in a direction away from the first wheel (5) and the second wheel (9) when the workpiece is squeezed.

5. The large module gear cold rolling structure according to claim 4, characterized in that: A circular arc groove (16) is provided on one side of the retaining frame (14) for contacting the workpiece. In a use state, the workpiece contacts the circular arc groove (16).

6. The large module gear cold rolling structure according to claim 5, characterized in that: Also includes The retaining ring (17) is rotatably arranged in the circular arc groove (16); the workpiece passes through the retaining ring (17) and abuts against the retaining ring (17); when the workpiece rotates, the retaining ring (17) rotates in the circular arc groove (16).

7. The large module gear cold rolling structure according to claim 6, characterized in that: A retaining frame (14) corresponding to the second rolling device (6) is located on a side away from the feeding device (18), and a retaining ring (17) on the retaining frame (14) is provided with an internal spline, the module of the internal spline being equal to the module of the gear extruded by the second rolling device (6), and the teeth extruded by the second rolling device (6) are meshed with the internal spline on the retaining ring (17).

8. The large module gear cold rolling structure according to claim 1, characterized in that: The number of the first flying discs (3) in each first rolling device (2) is two, and the two first flying discs (3) are symmetrically arranged on both sides of the workpiece, and are respectively used to extrude straight grooves on the workpiece from both sides of the workpiece; There are two second flying discs (7), which are symmetrically arranged on both sides of the workpiece and are used to extrude the straight grooves extruded by the first flying disc (3) into gear grooves from both sides of the workpiece.

9. The large module gear cold rolling structure according to claim 8, characterized in that: The first rolling device (2) also includes Two first flying disc mounting frames (10), the two first flying disc mounting frames (10) are symmetrically arranged on both sides of the workpiece, and the two second flying disc mounting frames (12) are both slidably arranged on the frame (1), and the two first flying discs (3) are respectively rotatably arranged on the two first flying disc mounting frames (10); a first mounting frame drive motor (11), the first mounting frame drive motor (11) being mounted on the frame (1) and being used to drive the first flying disc mounting frame (10) to move toward or away from the workpiece, the two first flying disc mounting frames (10) moving synchronously toward the workpiece or moving synchronously toward and away from the workpiece; The second rolling device (6) also includes Two second flying disc mounting frames (12), the two second flying disc mounting frames (12) are slidably mounted on the frame (1) and symmetrically arranged on both sides of the workpiece, and the two second flying discs (7) are respectively rotatably mounted on the two second flying disc mounting frames (12); A second mounting frame drive motor (13) is mounted on the frame (1) and is used to drive the second flying disc mounting frame (12) to move on the frame (1) toward or away from the workpiece, and the two second flying disc mounting frames (12) move synchronously toward the workpiece or synchronously toward and away from the workpiece.

10. A method for cold rolling large module gears, characterized in that: The large module gear cold rolling structure according to any one of claims 1 to 9 is adopted, comprising the following steps: Step 1: First, a straight groove C1 with a depth of D1 and a width of W1 is rolled out on the workpiece; Step 2: Roll out a straight groove C2 with a depth of D2 and a width of W2 on the basis of the straight groove C1, with D2>D1, W2<W1, and the distances between the two sides of the bottom of the straight groove C2 and the two sides of the straight groove C1 are equal; Step 3, repeating step 2 until a straight groove Cn with a depth Dn and a width Wn is extruded on the workpiece, where n is an integer greater than or equal to 2; Step 4: extrude the straight groove Cn into a gear groove to complete the gear processing.

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