A method for blunting sharp angles of tooth ends of a Torsen differential worm gear

Abstract

The present invention provides a method for blunting the sharp angle of the tooth end of a Torsen differential worm gear, belonging to the field of differential processing technology. Debugging: vertically clamp the worm gear to be blunted on the workpiece clamping mechanism; adjust the position of the grinding wheel until the starting end of the assembly section of the grinding bar is engaged with the end position of the worm gear to be blunted, and keep the worm gear to be blunted and the assembly section of the grinding bar loosely engaged; control the rotation of the grinding wheel, at this time, control the grinding wheel to move downward longitudinally, and stop the longitudinal movement of the grinding wheel when the cutting sound is heard, completing the blunting of the sharp angle of the top end surface of a tooth of the worm gear to be blunted; after debugging, it is only necessary to control the workpiece clamping mechanism to disassemble and assemble the workpiece, and after each workpiece or an end face of the workpiece is processed, it is necessary to ensure that the feed mechanism resets the grinding wheel, and keep the assembly section of the worm gear to be blunted engaged with the grinding bar before starting processing. The present invention has the advantages of high efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of differential processing and relates to a method for blunting the sharp angle of a tooth end of a worm wheel of a Torsen differential. Background Art

[0002] The Torsen center differential consists of a differential case, six worm shafts, a front axle worm, a rear axle worm, 12 spur gears, and six worm wheels. Each worm shaft has a worm wheel and two identical spur gears in the center. The worm wheels and spur gears are mounted to the differential case via the worm shafts. Three of the worm wheels mesh with the front axle worm, while the other three mesh with the rear axle worm. The worm wheels meshing with the front and rear axle worms are meshed with each other through spur gears. The front axle worm and the front gear shaft of the differential that drives the front axle are integrated, and the rear axle worm and the rear gear shaft of the differential that drives the rear axle are integrated. The Torsen differential uses the irreversibility principle of worm gear transmission and the high friction condition of the tooth surface to make the differential automatically lock or release according to the size of its internal differential torque (that is, the internal friction torque of the differential). That is, when the differential torque in the differential is small, it plays a differential role, and when the differential torque in the differential is too large, the differential will automatically lock, which can effectively improve the vehicle's passability.

[0003] Since the tooth end of the worm gear is the entry position or separation position where the front shaft worm (or rear shaft worm) engages with it, the tooth end of the worm gear is prone to uneven force, especially the acute angle of the tooth end of the worm gear. The acute angle referred to here is formed at the top surface of the tooth of the spiral gear. When the worm tooth extends to the top surface of the tooth, due to the spiral shape of the worm tooth, the two angles between the two engaging side surfaces of the worm tooth and the top surface of the tooth are one obtuse angle and the other acute angle. The material thickness at the obtuse angle position is larger and its own strength is also greater, but the acute angle position is sharp and the material is thin, which is prone to cracking during heat treatment. During the meshing transmission process after assembly to the differential, wear and tear are prone to produce large-particle metal chips. The generation of metal chips can easily damage the meshing units of the differential. The high operating temperature is also prone to cause local damage due to stress concentration. The destruction of mass balance caused by local damage will also affect the running stability and service life of the differential. Therefore, in the worm gear processing process of the Torsen differential, it is very necessary to process the sharp angle of the tooth end, which can not only reduce the probability of damage and the generation of metal chips, but also improve the overall dynamic balance performance of the differential, extend the service life and running stability.

[0004] In the existing technology, cutting and grinding equipment is generally used in conjunction with a telescopic clamping device to make the worm wheel intermittently contact the tool and grind the sharp angles of the worm wheel. Specifically, the clamping unit clamps the worm wheel so that the sharp angle of its end face is close to the tool. After the sharp angle of the tooth is polished, the worm wheel is retracted and rotated to align the other worm tooth with the tool, and this process is repeated. This method is not only inefficient, but also requires high control accuracy, including the accuracy of the rotation angle and the accuracy of the telescopic displacement. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for blunting the sharp angles of the tooth ends of a Torsen differential worm gear in response to the above-mentioned problems existing in the existing technology. The technical problem to be solved by the present invention is how to improve the efficiency of blunting the sharp angles of the tooth ends of the worm gear.

[0006] The object of the present invention can be achieved by the following technical solutions: A method for blunting the sharp angle of the tooth end of a Torsen differential worm gear, characterized in that the equipment used in the method includes a base, a grinding wheel and a workpiece clamping mechanism;

[0007] The grinding wheel is controlled to rotate by a driving motor, and the grinding wheel is slidably connected to a mounting plate along its axis. The wheel shaft of the grinding wheel has a spiral grinding strip that can mesh with the tooth end of the worm to be ground. The grinding strip is tangent to the tooth end of the worm to be ground and can contact the grinding portion of the worm to be ground. The side of the grinding strip close to the worm to be ground is a rough grinding surface.

[0008] The mounting plate is provided with a feeding mechanism capable of driving the grinding wheel to move along the axial direction;

[0009] The workpiece clamping mechanism includes a bracket, a lower top cone arranged at the bottom of the bracket and a locking rod threadedly connected to the bracket, the lower end of the locking rod has an upper top cone coaxial with the lower top cone; the base is provided with a guide rail allowing the bracket to slide, and the bracket is provided with a locking bolt for fixing the bracket to the base.

[0010] When the grinding wheel is located at the end of the worm to be blunted, the worm workpiece can be maintained in meshing with the grinding wheel with the spiral grinding strip in an inclined state. At this time, the rotation of the grinding wheel can drive the worm to be blunted to rotate. However, if the two are only meshed in this state, the grinding strip will only cause slight meshing wear on the acute angles of the worm to be blunted. Although the acute angles of each rack of the worm to be blunted can be polished, the amount of cutting caused by such slight wear is very small, that is, the tool cannot be fed relative to the polishing position during the grinding process. Since the worm to be blunted itself has multiple separated processing areas, it is difficult to ensure that the wear amount of each tooth of the worm is equal by simply advancing the workpiece clamping mechanism, which will cause the acute angles between different teeth of a single worm wheel to be blunted to different degrees, and it is very easy to cause damage to the worm to be blunted.

[0011] In order to solve the above problems and improve processing efficiency and processing uniformity, this solution provides a translational action to the grinding wheel through the feeding mechanism, so that the grinding wheel not only rotates but also moves slightly along its axial direction, so that different positions of the grinding strip participate in the grinding and cutting of the blunt worm gear to be ground. Since the rotation speed of the grinding wheel is relatively fast and its translation is relatively slow, the feeding of the grinding strip can be regarded as continuous, and it can be regarded as that all the sharp angles of the tooth ends of the worm gear are processed by the same position of the grinding strip more than once. In this way, while improving efficiency, the amount of cutting wear can be controlled, and the uniformity of cutting processing can be ensured, and the probability of damage to the blunt worm gear to be ground due to grinding can be reduced.

[0012] Furthermore, a mounting column is longitudinally provided on the base, a hydraulic cylinder is provided on the top of the mounting column, and a push rod of the hydraulic cylinder is connected to the mounting plate.

[0013] Furthermore, the feeding mechanism includes a sleeve and a cylinder splined to the grinding wheel, the sleeve is fixedly connected to the output shaft of the driving motor, the sleeve is rotatably connected to the mounting plate through a bearing, the push rod of the cylinder is rotatably connected to the grinding wheel through a bearing, and the cylinder body of the cylinder is fixed to the mounting plate.

[0014] Furthermore, the push rod of the hydraulic cylinder is rotatably connected to the mounting plate, the mounting column is provided with a locking screw, the mounting plate is provided with an arc guide groove with the rotation center of the mounting plate as the center of the circle, the locking screw is inserted in the arc guide groove, and the locking screw is threadedly connected to a locking nut that fixes the mounting plate to the mounting column.

[0015] Furthermore, a slider is fixedly provided on the push rod of the hydraulic cylinder, a sliding groove cooperating with the slider is provided on the mounting column, and the mounting plate is rotatably connected to the slider.

[0016] The grinding wheel can achieve longitudinal position adjustment and can swing around the transfer point between the push rod of the hydraulic cylinder and the mounting plate, thereby adjusting the position of the grinding wheel to adapt to the longitudinally arranged worm wheel to be blunted. The position of the grinding wheel is adjusted according to the thread lead angle, length and required cutting amount of the worm wheel to be blunted. In particular, it is necessary to ensure that the grinding strip does not cause wear to the tooth surface of the worm wheel to be blunted during the rotation of the grinding wheel, thereby ensuring the engagement between the worm wheel to be blunted and the grinding strip.

[0017] Furthermore, a support column is fixedly provided at the bottom of the bracket, and a gear box is provided on the top of the support column. A plurality of limiting wheels are provided in the gear box and are evenly distributed circumferentially on the outside of the lower top cone. The limiting wheels are coaxial with the worm gear to be blunted, and each limiting wheel can simultaneously engage with the worm gear to be blunted and enclose the worm gear to be blunted.

[0018] Since the sharp-angle blunting of the worm gear is carried out at the top surface of the worm gear teeth, and the worm gear needs to be in a rotating state during the processing, its clamping reliability is very critical. Otherwise, it will deviate under the thrust of the grinding wheel, thereby affecting the processing quality and even causing damage to the worm gear to be scrapped.

[0019] In this solution, a coaxially arranged upper and lower top cones are used to act on the machining holes at the centers of the top surfaces of the two teeth of the worm gear to be blunted. The ends of the upper and lower top cones are spherical, which can keep the worm gear to be blunted in a vertical state and have a small rotational resistance. However, the worm gear to be blunted will relax slightly during the machining process, and the grinding wheel will always maintain a unidirectional thrust on the worm gear to be blunted. In addition, the rod-shaped worm gear to be blunted is subjected to force at the end, which will cause wear of the machining holes on the top surfaces of the two teeth of the worm gear to be blunted, and will also affect the coaxiality of the worm gear to be blunted with the upper and lower top cones during the machining process, thereby affecting the machining quality. In addition, the machining holes will be repeatedly used in the subsequent machining of the worm gear to be blunted, and the wear of the machining holes is not conducive to the quality of the worm gear finished product. In order to solve this problem, in this solution, the idle end of the worm gear to be blunted is clamped by wrapping it with multiple limiting wheels. The limiting wheel has a tooth structure that matches the worm gear to be blunted, that is, the limiting wheel has a spiral rack that can engage with the worm gear to be blunted. On the one hand, it facilitates the insertion and positioning of the worm gear to be blunted. On the other hand, since the limiting gears also rotate synchronously during the rotation of the worm gear to be blunted, when the processing end of the worm gear to be blunted tilts and deviates from the original axis, the rotation of the limiting gear will correct the deviation of the worm gear to be blunted, thereby improving the coaxiality of the worm gear to be blunted during processing.

[0020] Furthermore, the polishing strip includes an assembly section at one end and a polishing section connected to the assembly section; the outer diameter of the polishing strip at the assembly section is smaller than the outer diameter of the polishing section.

[0021] As another solution, the grinding bar includes an assembly section, several grinding sections and a polishing section connected in sequence; the outer diameter of the grinding bar of each grinding section gradually increases from the assembly section to the polishing section; the outer diameter of the grinding bar of the assembly section is smaller than the outer diameter of the adjacent grinding section.

[0022] The blunting method includes the following steps: S1, debugging: vertically clamping the worm gear to be blunted on the workpiece clamping mechanism; adjusting the position of the grinding wheel until the starting end of the assembly section of the grinding strip is engaged with the end position of the worm gear to be blunted, and keeping the worm gear to be blunted and the assembly section of the grinding strip loosely engaged; controlling the rotation of the grinding wheel, the grinding section of the grinding wheel begins to engage with the worm gear to be blunted, and the grinding wheel drives the worm gear to be blunted to rotate synchronously, at this time, controlling the hydraulic cylinder to move the grinding wheel longitudinally downward, and stopping the longitudinal movement of the grinding wheel when a cutting sound is heard, completing the sharp angle of the top surface of one tooth of the worm gear to be blunted. Blunt grinding; observe the blunting condition of the processed workpiece and the wear condition of the non-processing position of the workpiece, and adjust the longitudinal position and horizontal inclination of the grinding wheel until the blunting condition is ideal; S2. After the debugging is completed, it is only necessary to control the workpiece clamping mechanism to disassemble and assemble the workpiece. After each workpiece or an end face of the workpiece is processed, it is necessary to ensure that the feed mechanism resets the grinding wheel, and keeps the assembly section of the worm gear to be blunt engaged with the grinding bar before starting processing. Before starting processing, it is necessary to ensure that the grinding position of the worm gear to be blunt is below the intersection of the grinding wheel axis and the horizontal plane where the grinding position is located. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the planar structure of the sharp angle grinding equipment.

[0024] Figure 2 yes Figure 1 Top view of .

[0025] Figure 3 This is a schematic diagram of the three-dimensional structure of the unblunted Torsen differential worm gear.

[0026] Figure 4 Figure a in the figure is Figure 3 A magnified view of the middle part A; Figure 4 Figure b in the figure is Figure 4 Schematic diagram of the state after the sharp angle in Figure a is blunted.

[0027] Figure 5 It is a schematic diagram of the coordination between the grinding wheel and the workpiece during the blunting process.

[0028] Figure 6 It is a schematic diagram of the three-dimensional structure of the grinding wheel on the mounting plate.

[0029] Figure 7 is a cross-sectional view of the mounting column.

[0030] Figure 8 It is a structural diagram of the workpiece clamping mechanism.

[0031] Figure 9 yes Figure 8 Enlarged view of part B in the middle.

[0032] Figure 10 It is a schematic diagram of the principle of the feeding mechanism.

[0033] Figure 11 This is a schematic diagram of the matching state between the grinding wheel and the workpiece during the blunting process (different from Figure 5 perspective).

[0034] Figure 12 It is a schematic diagram of the multi-section structure of the grinding wheel.

[0035] In the figure, 1. base; 2. grinding wheel; 21. grinding strip; 211. assembly section; 212. grinding section; 213. polishing section; 31. drive motor; 32. mounting plate; 33. mounting column; 34. hydraulic cylinder; 35. locking screw; 36. arc guide groove; 37. locking nut; 38. slider; 39. slide groove; 41. bracket; 42. lower top cone; 43. upper top cone; 44. locking rod; 45. guide rail; 46. locking bolt; 47. bushing; 48. cylinder; 51. support column; 52. gear box; 53. limit wheel; g. worm wheel to be blunted; 6. large pulley. DETAILED DESCRIPTION

[0036] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0037] First, explain the acute angle of the tooth end of the Torsen differential worm gear, such as Figure 3 and Figure 4 As shown in Figure a, at the junction of the worm wheel and the tooth top surface, the end of the spiral rack forms an obtuse angle and an acute angle at the tooth top surface. Figure 4 At the dotted oval mark on the left side of Figure a, the acute angle is as follows Figure 4 At the dotted oval mark on the right side of Figure a, grind the sharp corners to Figure 4 The state shown in Figure b is the blunting process referred to in this solution. Before blunting, the position is sharp and fragile, and there are burrs.

[0038] Description of the structure of this grinding machine: Figure 1 、 2, 8 and 9, its workpiece clamping mechanism includes a bracket 41, a lower top cone 42 arranged at the bottom of the bracket 41 and a locking rod 44 threadedly connected to the bracket 41, the lower end of the locking rod 44 has an upper top cone 43 coaxial with the lower top cone 42; the base 1 is provided with a guide rail 45 for allowing the bracket 41 to slide, and the bracket 41 is provided with a locking bolt 46 for fixing the bracket 41 to the base 1; a support column 51 is fixedly provided at the bottom of the bracket 41, and a gear box 52 is provided at the top of the support column 51, and a plurality of limiting wheels 53 are provided in the gear box 52, which are uniformly distributed circumferentially on the outside of the lower top cone 42, and the limiting wheels 53 are coaxial with the worm gear g to be blunted, and each limiting wheel 53 can simultaneously engage with the worm gear g to be blunted and enclose the worm gear g to be blunted.

[0039] Since the sharp-angle blunting of the worm gear is carried out at the top surface of the worm gear teeth, and the worm gear needs to be in a rotating state during the processing, its clamping reliability is very critical. Otherwise, it will deviate under the thrust of the grinding wheel 2, thereby affecting the processing quality and even causing damage to the worm gear g to be blunted and scrapped.

[0040] In this solution, the coaxially arranged upper top cone 43 and lower top cone 42 are used to act on the machining holes at the centers of the two tooth top surfaces of the worm gear g to be blunted. The ends of the upper top cone 43 and the lower top cone 42 are spherical, which can keep the worm gear g to be blunted in a vertical state and have a small rotational resistance. However, the worm gear g to be blunted will relax slightly during the machining process, and the grinding wheel 2 will always maintain a unidirectional thrust on the worm gear g to be blunted. In addition, the rod-shaped worm gear g to be blunted is subjected to force at the end, which will cause wear of the machining holes on the two tooth top surfaces of the worm gear g to be blunted, and will also affect the coaxiality of the worm gear g to be blunted with the upper top cone 43 and the lower top cone 42 during the machining process, thereby affecting the machining quality. In addition, the machining holes will be repeatedly used in the subsequent machining of the worm gear g to be blunted, and the wear of the machining holes is not conducive to the quality of the worm gear finished product. To solve this problem, in this solution, the idle end of the worm gear g to be blunted is wrapped by multiple limiting wheels 53 to clamp it. The limiting wheels 53 have a tooth structure that matches the worm gear g to be blunted, that is, the limiting wheels 53 have a spiral rack that can mesh with the worm gear g to be blunted. On the one hand, this facilitates the insertion and positioning of the worm gear g to be blunted. On the other hand, since the limiting gears also rotate synchronously during the rotation of the worm gear g to be blunted, when the processing end of the worm gear g to be blunted tilts and deviates from the original axis, the rotation of the limiting gears will correct the deviation of the worm gear g to be blunted, thereby improving the coaxiality of the worm gear g to be blunted during processing. Regarding the principle of correction: since the limiting wheels 53 are actually shorter worm wheels with spiral teeth, when the workpiece tilts, the surrounded limiting wheels 53 will mesh with the workpiece during rotation to guide the workpiece. The limiting gears that are tightly meshed with the workpiece keep the workpiece clamped and aligned. Since each limiting gear can rotate independently, the insertion of the workpiece will not be difficult due to tight meshing.

[0041] It also includes the regulation part, such as Figure 1 、 Figure 2 、 Figure 6 and Figure 7 As shown, the adjustment part includes a mounting column 33 longitudinally arranged on the base 1, a hydraulic cylinder 34 is provided on the top of the mounting column 33, and the push rod of the hydraulic cylinder 34 is connected to the mounting plate 32; the drive motor 31, the cylinder 48, the mounting plate 32, and the grinding wheel 2 are a whole, which can move longitudinally as a whole under the action of the hydraulic cylinder 34, and can also rotate around the transfer point between the slider 38 and the mounting plate 32 to change the inclination angle of the grinding wheel 2. A small-sized belt is provided on the output end of the drive motor 31 A large pulley 6 is fixed on the shaft sleeve 47, and the small-sized pulley is connected to the large pulley 6 by a belt, and a connecting piece wrapped with the belt is provided between the housing of the drive motor 31 and the mounting plate 32. The cylinder body of the cylinder 48 is fixed on the mounting plate 32, and the action of the push rod of the cylinder 48 can drive the grinding wheel 2 to move along the axial direction. After the shaft sleeve 47 is subjected to the torque of the drive motor 31, it is transmitted to the grinding wheel 2 through the spline, so that the grinding wheel 2 can be driven to translate by the feed mechanism while rotating.

[0042] The push rod of the hydraulic cylinder 34 is rotationally connected to the mounting plate 32. The mounting post 33 has a locking screw 35. The mounting plate 32 is provided with an arcuate guide groove 36 centered on the center of rotation of the mounting plate 32. The locking screw 35 is inserted into the arcuate guide groove 36. The locking screw 35 is threadedly connected to a locking nut 37 that secures the mounting plate 32 to the mounting post 33. A slider 38 is fixedly provided on the push rod of the hydraulic cylinder 34. The mounting post 33 has a slide groove 39 that cooperates with the slider 38. The mounting plate 32 is rotationally connected to the slider 38.

[0043] The grinding wheel 2 can be adjusted in its longitudinal position and can swing around the transfer point between the push rod of the hydraulic cylinder 34 and the mounting plate 32, thereby adjusting the position of the grinding wheel 2 to adapt to the longitudinally arranged worm gear g to be blunted. The position of the grinding wheel 2 is adjusted according to the thread lead angle, length and required cutting amount of the worm gear to be blunted, especially to ensure that the grinding bar 21 will not cause wear to the tooth surface of the worm gear g to be blunted during the rotation of the grinding wheel 2, thereby ensuring the engagement between the worm gear g to be blunted and the grinding bar 21.

[0044] The purpose of adjusting the inclination angle of the grinding wheel 2 is to make the workpiece engage with the grinding strip 21 without causing damage to the tooth surface of the workpiece. When the thread lead angle of the workpiece is large, the inclination angle of the grinding wheel 2 needs to be adjusted to a larger value. The rack of the workpiece at the tangent point can be maintained parallel to the grinding strip 21, or they can be non-parallel, as long as it is ensured that the workpiece can be engaged and the grinding strip only contacts the position to be ground during rotation; when the grinding strip 21 leaves the tooth groove of the workpiece, the cutting force acting at the acute angle drives the workpiece to rotate, so as to switch the next tooth groove to engage with the grinding strip 21.

[0045] The feeding mechanism is one of the cores of this solution. Figure 2 and Figure 10 As shown, it includes a sleeve 47 and a cylinder 48 splined to the grinding wheel 2. The sleeve 47 is fixedly connected to the output shaft of the drive motor 31. The sleeve 47 is rotatably connected to the mounting plate 32 through a bearing. The push rod of the cylinder 48 is rotatably connected to the grinding wheel 2 through a bearing, and the cylinder body of the cylinder 48 is fixed to the mounting plate 32.

[0046] like Figure 5 and Figure 11 As shown, when the grinding wheel 2 is located at the end of the worm to be blunted, the worm workpiece can be maintained in meshing with the grinding wheel 2 with the spiral grinding strip 21 in an inclined state. At this time, the rotation of the grinding wheel 2 can drive the worm to be blunted to rotate. However, if the two are only meshed in this state, the grinding strip 21 will only cause slight meshing wear on the acute angles of the worm gear g to be blunted. Although the acute angles of each rack of the worm gear g to be blunted can be polished, the amount of cutting caused by such slight wear is very small, that is, the tool cannot be fed relative to the polishing position during the grinding process. Since the worm gear g to be blunted itself has multiple separated processing areas, it is difficult to ensure that the wear of each tooth of the worm is equal by simply advancing the workpiece clamping mechanism, which will cause the acute angles between different teeth of a single worm gear to be blunted to different degrees, and it is very easy to cause damage to the worm gear g to be blunted.

[0047] In order to solve the above problems and improve processing efficiency and uniformity, this solution provides a translational action to the grinding wheel 2 through the feeding mechanism, so that the grinding wheel 2 not only rotates but also moves slightly along its axial direction, so that different positions of the grinding strip 21 participate in the grinding and cutting of the blunt worm gear g to be ground. Since the rotation speed of the grinding wheel 2 is relatively fast and its translation is relatively slow, the feeding of the grinding strip 21 can be regarded as continuous, and it can be regarded as that all the sharp angles of the tooth ends of the worm gear are processed more than once by the same position of the grinding strip 21. In this way, while improving efficiency, the amount of cutting wear can be controlled, and the uniformity of cutting processing can be ensured, thereby reducing the probability of damage to the blunt worm gear g to be ground.

[0048] The grinding strip 21 includes an assembly section 211 at one end and a grinding section 212 connected to the assembly section 211 . The outer diameter of the grinding strip 21 at the assembly section 211 is smaller than the outer diameter of the grinding section 212 .

[0049] Alternatively, the grinding bar 21 comprises an assembly section 211, several grinding sections 212, and a polishing section 213, which are connected in sequence. The outer diameter of the grinding bar 21 increases gradually from the assembly section 211 to the polishing section 213. The outer diameter of the grinding bar 21 in the assembly section 211 is smaller than that of the adjacent grinding sections 212. The assembly section 211 is used for clamping a workpiece, while the grinding sections 212 of varying outer diameters enable progressive grinding of the workpiece, minimizing the amount of grinding required per session and preventing burrs and peeling. The polishing section 213 improves the smoothness of the wear surface through fine grinding.

[0050] The blunting method includes the following steps: S1, debugging: vertically clamping the worm gear g to be blunted on the workpiece clamping mechanism; adjusting the position of the grinding wheel 2 until the starting end of the assembly section 211 of the grinding bar 21 is engaged with the end position of the worm gear g to be blunted, and keeping the worm gear g to be blunted loosely engaged with the assembly section 211 of the grinding bar 21; controlling the grinding wheel 2 to rotate, and the grinding section 212 of the grinding wheel 2 begins to engage with the worm gear g to be blunted, and the grinding wheel 2 drives the worm gear g to be blunted to rotate synchronously, at this time, controlling the hydraulic cylinder 34 to move the grinding wheel 2 longitudinally downward, and stopping the longitudinal movement of the grinding wheel 2 when a cutting sound is heard, completing the grinding of the worm gear g to be blunted. The sharp angles of the top surfaces of the teeth are blunted; the blunting condition of the processed workpiece and the wear on the non-processing position of the workpiece are observed, and the longitudinal position and horizontal inclination angle of the grinding wheel 2 are adjusted until the blunting condition is ideal; S2, after the debugging is completed, it is only necessary to control the workpiece clamping mechanism to disassemble and assemble the workpiece. After each workpiece or an end face of the workpiece is processed, it is necessary to ensure that the feed mechanism resets the grinding wheel 2, and before starting processing, the worm gear g to be blunted is kept engaged with the assembly section 211 of the grinding bar 21, and before starting processing, it is necessary to ensure that the grinding position of the worm gear g to be blunted is below the intersection of the axis of the grinding wheel 2 and the horizontal plane where the grinding position is located.

[0051] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. A method for blunting the sharp angle of the tooth end of a Torsen differential worm gear, characterized in that: The equipment used in the method includes a base (1), a grinding wheel (2) and a workpiece clamping mechanism; The grinding wheel (2) is controlled to rotate by a driving motor (31), and the grinding wheel (2) is slidably connected to a mounting plate (32) along its axial direction. The wheel shaft of the grinding wheel (2) has a spiral grinding strip (21) that can mesh with the tooth end of the worm to be ground. The grinding strip (21) is tangent to the tooth end of the worm gear (g) to be ground and can contact the grinding portion of the worm gear (g) to be ground. The grinding strip (21) has a rough grinding surface on the side close to the worm gear (g) to be ground. The mounting plate (32) is provided with a feeding mechanism capable of driving the grinding wheel (2) to move along the axial direction; The workpiece clamping mechanism comprises a bracket (41), a lower top cone (42) arranged at the bottom of the bracket (41), and a locking rod (44) threadedly connected to the bracket (41), wherein the lower end of the locking rod (44) has an upper top cone (43) coaxial with the lower top cone (42); a guide rail (45) for allowing the bracket (41) to slide is provided on the base (1), and a locking bolt (46) for fixing the bracket (41) to the base (1) is provided on the bracket (41); The grinding strip (21) comprises an assembly section (211) at one end and a grinding section (212) connected to the assembly section (211); the outer diameter of the grinding strip (21) at the assembly section (211) is smaller than the outer diameter of the grinding section (212); The method for blunting the sharp angle of a tooth end comprises the following steps: S1, debugging: vertically clamping a worm wheel (g) to be blunted on a workpiece clamping mechanism; adjusting the position of a grinding wheel (2) until the starting end of an assembly section (211) of a grinding bar (21) is engaged with the end position of the worm wheel (g) to be blunted, and maintaining a loose engagement between the worm wheel (g) to be blunted and the assembly section (211) of the grinding bar (21); controlling the grinding wheel (2) to rotate, and the grinding section (212) of the grinding wheel (2) begins to engage with the worm wheel (g) to be blunted, and the grinding wheel (2) drives the worm wheel (g) to be blunted to rotate synchronously, at this time, controlling the hydraulic cylinder (34) to move the grinding wheel (2) longitudinally downward, and stopping the longitudinal movement of the grinding wheel (2) when a cutting sound is heard , complete the blunting of the acute angle of the top tooth surface of the worm wheel (g) to be blunted; observe the blunting condition of the processed workpiece and the wear condition of the non-processing position of the workpiece, and adjust the longitudinal position and horizontal inclination of the grinding wheel (2) until the blunting condition is ideal; S2, after the debugging is completed, it is only necessary to control the workpiece clamping mechanism to disassemble and assemble the workpiece. After each workpiece or an end face of the workpiece is processed, it is necessary to ensure that the feed mechanism resets the grinding wheel (2), and before starting processing, the worm wheel (g) to be blunted is kept in meshing with the assembly section (211) of the grinding bar (21), and before starting processing, it is necessary to ensure that the grinding position of the worm wheel (g) to be blunted is below the intersection of the axis of the grinding wheel (2) and the horizontal plane where the grinding position is located.

2. The method for blunting the sharp angle of the tooth end of a Torsen differential worm gear according to claim 1, characterized in that: A mounting column (33) is longitudinally provided on the base (1), a hydraulic cylinder (34) is provided on the top of the mounting column (33), and a push rod of the hydraulic cylinder (34) is connected to the mounting plate (32).

3. A method for blunting sharp angles of tooth ends of a Torsen differential worm gear according to claim 1 or 2, characterized in that: The feeding mechanism comprises a sleeve (47) and a cylinder (48) splined to the grinding wheel (2), wherein the sleeve (47) is fixedly connected to the output shaft of the driving motor (31), the sleeve (47) is rotatably connected to the mounting plate (32) via a bearing, a push rod of the cylinder (48) is rotatably connected to the grinding wheel (2) via a bearing, and a cylinder body of the cylinder (48) is fixed to the mounting plate (32).

4. The method for blunting the sharp angle of the tooth end of a Torsen differential worm gear according to claim 2, characterized in that: The push rod of the hydraulic cylinder (34) is rotatably connected to the mounting plate (32), the mounting column (33) is provided with a locking screw (35), the mounting plate (32) is provided with an arc-shaped guide groove (36) with the rotation center of the mounting plate (32) as the center of the circle, the locking screw (35) is inserted into the arc-shaped guide groove (36), and the locking screw (35) is threadedly connected to a locking nut (37) for fixing the mounting plate (32) to the mounting column (33).

5. The method for blunting the sharp angle of the tooth end of a Torsen differential worm gear according to claim 4, characterized in that: A slider (38) is fixedly provided on the push rod of the hydraulic cylinder (34), a slide groove (39) cooperating with the slider (38) is provided on the mounting column (33), and the mounting plate (32) is rotatably connected to the slider (38).

6. A method for blunting sharp angles of tooth ends of a Torsen differential worm gear according to claim 1 or 2, characterized in that: A support column (51) is fixedly provided at the bottom of the bracket (41), a gear box (52) is provided at the top of the support column (51), and a plurality of limiting wheels (53) are provided in the gear box (52) and are evenly distributed circumferentially on the outside of the lower top cone (42). The limiting wheels (53) are coaxial with the worm gear (g) to be blunted, and each limiting wheel (53) can simultaneously engage with the worm gear (g) to be blunted and enclose the worm gear (g) to be blunted.

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