High-precision gear machining system and method convenient and fast to scale

Abstract

The invention relates to a high-precision gear machining system and method convenient for indexing. The technical problems that positioning errors are easily accumulated due to the fact that the contact area is large in an existing face contact positioning mode, and rapid and accurate adjustment is difficult to conduct when the linear speed of a gear rolling structure is inconsistent with that of a workpiece to be machined are solved. Comprising a lathe bed base, stand columns are arranged on the two sides of the upper end of the lathe bed base respectively, gear rolling structures are arranged on the corresponding sides of the two stand columns respectively, a gear rolling gap for containing a to-be-machined workpiece is formed between the gear rolling structures, the to-be-machined workpiece is provided with a to-be-rolled gear shaft, a front ejector pin structure is arranged on one side of the lathe bed base, and a rear ejector pin structure is arranged on the other side of the lathe bed base. The front ejector pin structure is provided with a front ejector pin assembly capable of rotating in the circumferential direction, and a line contact positioning structure is arranged on the front ejector pin assembly. The positioning device has the advantages that the fan-shaped part of the to-be-machined workpiece is fixed through the linear contact positioning structure, the front ejector pin structure and the rear ejector pin structure are combined to abut against the two ends of the to-be-machined workpiece, the positioning accuracy of each time is guaranteed, and the machining precision is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of high-precision gear hobbing equipment, and particularly relates to a gear processing system and method with high-precision indexing and convenience. Background Art

[0002] During the gear processing, the accuracy of positioning is also a key factor affecting the processing accuracy. For traditional positioning methods, such as the method of using surface contact to position the workpiece to be processed in some cases, it is easy to cause the accumulation of positioning errors due to the large contact area, and it is difficult to ensure the high precision of each positioning. In the gear hobbing processing link, if the workpiece is not accurately positioned, the contact state between the gear hobbing structure and the workpiece will be inconsistent, resulting in a large tooth profile error of the processed gear and affecting the transmission performance of the gear. At the same time, during the processing, when there is a situation where the linear speed of the gear hobbing structure is inconsistent with the workpiece to be processed, some existing processing systems are difficult to adjust quickly and accurately, which will cause the gear hobbing structure to be unable to process the workpiece to be processed evenly at the same time, resulting in a large accuracy difference between the teeth of the processed gear, reducing the overall quality and service life of the gear. Summary of the Invention

[0003] The purpose of the present invention is to solve the above problems and provide a gear processing system with high-precision indexing and convenience.

[0004] Another purpose of the present invention is to solve the above problems and provide a gear processing method with high-precision indexing and convenience.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions: A gear processing device with high-precision indexing and convenience includes a bed base. On both sides of the upper end of the bed base, there are respectively provided vertically arranged columns. On one side corresponding to the two columns, there are respectively provided gear hobbing structures, and a gear hobbing gap for accommodating the workpiece to be processed is formed between the gear hobbing structures. The workpiece to be processed has a shaft to be gear hobbed, and one end of the shaft to be gear hobbed is connected with a sector part having blank surfaces on both sides. On one side of the bed base, there is a front center structure, and on the other side, there is a rear center structure. The front center structure and the rear center structure respectively correspond to both ends of the shaft to be gear hobbed. The front center structure has a front center component that can rotate circumferentially, and a line contact positioning structure for positioning the workpiece to be processed and capable of making line contact with the blank surface of the sector part is provided on the front center component. With the cooperation of the front center structure and the rear center structure, and then using the line contact positioning structure, high-precision positioning of the workpiece to be processed is achieved. At the same time, the end of the shaft to be gear hobbed far from the sector part is the part to be processed.

[0006] In the above-mentioned gear processing device with high-precision indexing and convenience, the front center component includes a front center seat. One end of the front center seat is provided with a front center head. The end of the front center head away from the front center seat has a front center body. And the front center head is connected to a front center rotation servo motor arranged at the other end of the front center seat through a rotating inner cone sleeve rotatably arranged in the front center seat. The front center rotation servo motor in the front center component can accurately control the rotation angle of the front center seat, thereby driving the workpiece to be processed to rotate precisely. The servo motor has the characteristics of fast response speed and high control precision, and can quickly and accurately adjust the position of the workpiece according to the processing requirements, improving the processing efficiency.

[0007] In the above-mentioned gear processing device with high-precision indexing and convenience, the line contact positioning structure includes a front center positioning sleeve coaxially fixed with the front center head. The upper side of the front center positioning sleeve has a front center positioning notch recessed inward for one end of the shaft to be gear-rolled to be inserted. And the front center body extends into the front center positioning notch and abuts against one end of the shaft to be gear-rolled. At one end of the front center positioning sleeve away from the front center head, there are two positioning columns. The positioning columns are parallel to each other and are respectively located on both sides of the front center positioning notch. And the positioning columns are respectively abutted against two blank surfaces of the sector part. At one end of the front center positioning sleeve away from the front center head, there is a workpiece support bracket located at the lower end of the front center positioning notch. The workpiece support bracket is bent and one end has an arc groove for placing the shaft to be gear-rolled and corresponding to the front center body. The front center positioning sleeve in the line contact positioning structure has a front center positioning notch, which can accurately insert one end of the shaft to be gear-rolled. And the front center body abuts against one end of the shaft to be gear-rolled, realizing axial positioning. At the same time, the two positioning columns are respectively in line contact with the blank surfaces of the sector part, which can accurately limit the circumferential position of the workpiece to be processed. In this way, compared with surface contact, the line contact method has higher positioning accuracy, can effectively reduce the positioning error, and ensure the accuracy of processing. And the workpiece support bracket is bent and one end has an arc groove, which can be adjusted according to the shape and size of the shaft to be gear-rolled, providing stable support for the workpiece to be processed, and at the same time facilitating the clamping and positioning of workpieces to be processed with different types and sizes, further enhancing the adaptability of the equipment.

[0008] In the above-mentioned gear processing device with high-precision indexing and convenience, the front center structure includes a front center cross beam. At the lower side of one end of the front center cross beam away from the bed base, there is a front cross beam support rod. On the upper side of the front center cross beam, there is a front center slide connected to the front center seat. And in the front center cross beam, there is a front center drive component connected to the side of the front center slide away from the front center seat.

[0009] In the above-mentioned gear processing device with high-precision indexing and convenience, the rear thimble structure includes a rear thimble cross beam. A rear cross beam support rod is provided on the lower side of one end of the rear thimble cross beam away from the bed base. A rear thimble slide is provided on the upper side of the rear thimble cross beam. A rear thimble seat is provided on the upper side of the rear thimble slide. A rear thimble cone sleeve is provided at one end of the rear thimble seat close to the bed base. A rear thimble head corresponding to the front thimble head is provided in the rear thimble cone sleeve. And a rear thimble driving component connected to the rear thimble slide is provided in the rear thimble cross beam. The front thimble structure and the rear thimble structure respectively correspond to both ends of the gear shaft to be broached. Through the cooperation of the front thimble head and the rear thimble head, the axis position of the workpiece to be processed can be accurately determined, ensuring that the workpiece will not shake or shift during the processing, thereby improving the processing accuracy.

[0010] In the above-mentioned gear processing device with high-precision indexing and convenience, a bearing seat is provided between the upper ends of the two columns. Motor brackets are respectively provided at both ends on the upper side of the bearing seat. A broaching driving motor is provided at the upper end of the motor bracket. And a broaching lead screw axially penetrating the bearing seat and connected to the broaching driving motor is provided at the lower end of the motor bracket.

[0011] In the above-mentioned gear processing device with high-precision indexing and convenience, the broaching structure includes a broaching slide sleeved on the broaching lead screw. A lead screw nut connected to the broaching lead screw is provided on the inner side of the upper end of the broaching slide. A nut fixing seat is provided between the lead screw nut and the broaching slide. Broaching tool assemblies are respectively provided on one side of the two corresponding broaching slides. The broaching gap is located between the two broaching tool assemblies. And one side of the broaching slide away from the broaching tool assembly is located inside the column. The broaching driving motors at the upper ends of the two columns drive the broaching slide to move through the broaching lead screw. The lead screw drive has the advantages of high transmission accuracy and good stability, can accurately control the position of the broaching slide, meet the gear processing requirements of different sizes and precisions, and also facilitates adjusting the broaching position according to the requirements during the processing.

[0012] A gear processing method with high-precision indexing and convenience, this method includes the following steps:

[0013] S1. Use line contact to roughly position the fan-shaped part of the workpiece to be processed, and tighten both ends of the workpiece to be processed through the front thimble structure and the rear thimble structure;

[0014] S2. The front thimble driving component controls the movement of the front thimble seat, and the rear thimble driving component controls the movement of the rear thimble seat. After the front thimble seat and the rear thimble seat tighten the workpiece to be processed, they drive the workpiece to be processed to start moving towards the broaching gap direction to form a preliminary positioning of the broaching position;

[0015] S3. The two gear hobbing structures operate alternately. During the operation, the workpiece to be machined rotates along with them. When the linear velocities are inconsistent, the rotation of the workpiece to be machined for one circle is controlled by the front center assembly, so that the gear hobbing structure just reaches the end position of one full circle of the workpiece to be machined. Then, the rotation of the workpiece to be machined is stopped, and then the gear hobbing stroke is completed.

[0016] In the above-mentioned high-precision indexing and convenient gear machining method, in step S1, the blank surface of the sector part is fixed through the line contact positioning structure, and then the two ends of the workpiece to be machined are tightened by the front center structure and the rear center structure, so as to ensure accurate positioning each time.

[0017] In the above-mentioned high-precision indexing and convenient gear machining method, in steps S2 - S3, when machining the workpiece to be machined by the two gear hobbing structures, when the linear velocities are inconsistent, the two gear hobbing structures cannot contact the workpiece to be machined simultaneously. The workpiece to be machined needs to rotate one circle driven by the front center rotation servo motor, so as to make the indexing accurate. Then, the front center rotation servo motor is disconnected, and then the gear hobbing stroke is completed.

[0018] Compared with the existing technology, the advantages of the present invention are as follows:

[0019] 1. The device fixes the sector part of the workpiece to be machined through the line contact positioning structure, and combines the front center structure and the rear center structure to tighten the two ends of the workpiece to be machined, ensuring the accuracy of each positioning, improving the machining accuracy, and reducing the influence of positioning errors on the machining accuracy.

[0020] 2. During the gear hobbing process of the device, when the linear velocity of the gear hobbing structure is inconsistent with that of the workpiece to be machined, the rotation of the workpiece to be machined can be accurately controlled through the front center assembly, so that the gear hobbing structure just reaches the end position of one full circle of the workpiece to be machined, ensuring that the gear hobbing structure processes the workpiece to be machined evenly at the same time, and avoiding the offset of the tooth alignment angle and tooth profile error caused by inconsistent linear velocities. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is the structural schematic diagram of the present invention.

[0022] Figure 2 is the side view of the present invention.

[0023] Figure 3 is the structural schematic diagram of the gear hobbing structure in the present invention.

[0024] Figure 4 is the structural schematic diagram of the front center structure in the present invention.

[0025] Figure 5 is the structural schematic diagram of the rear center structure in the present invention.

[0026] Figure 6 It is a structural sectional view of the front ejector pin structure and the rear ejector pin structure in the present invention.

[0027] Figure 7 It is a schematic structural diagram of the front ejector pin positioning sleeve in the present invention.

[0028] Figure 8 It is a schematic structural diagram of the workpiece to be processed in the present invention.

[0029] Figure 9 It is of the present invention Figure 4 The enlarged structural view at position A.

[0030] Figure 10 It is of the present invention Figure 6 The enlarged structural view at position B.

[0031] In the figure: bed base 1, column 11, bearing seat 12, motor frame 13, hobbing drive motor 14, hobbing lead screw 15, hobbing structure 2, hobbing gap 21, hobbing slide 22, lead screw nut 23, nut fixing seat 24, hobbing tool assembly 25, workpiece to be processed 3, shaft to be hobbed 31, fan-shaped part 32, rough surface 33, front ejector pin structure 4, front ejector pin assembly 41, front ejector pin seat 42, front ejector pin head 43, front ejector pin body 44, rotating inner cone sleeve 45, front ejector pin rotating servo motor 46, front ejector pin cross beam 47, front cross beam support rod 48, front ejector pin slide 49, front ejector pin drive assembly 50, rear ejector pin structure 5, rear ejector pin cross beam 51, rear cross beam support rod 52, rear ejector pin slide 53, rear ejector pin seat 54, rear ejector pin cone sleeve 55, rear ejector pin head 56, rear ejector pin drive assembly 57, line contact positioning structure 6, front ejector pin positioning sleeve 61, front ejector pin positioning notch 62, positioning column 63, workpiece bracket 64, arc groove 65. Detailed implementation manners

[0032] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation manners.

[0033] As Figures 1-10As shown in the figure, a gear processing device with high-precision indexing and convenience includes a bed base 1. On both sides of the upper end of the bed base 1, there are vertically arranged columns 11 respectively. On one side of the two corresponding columns 11, there are hobbing structures 2 respectively, and a hobbing gap 21 for accommodating a workpiece to be processed 3 is formed between the hobbing structures 2. The workpiece to be processed 3 has a shaft to be hobbed 31, and one end of the shaft to be hobbed 31 is connected with a sector part 32 with blank surfaces 33 on both sides. On one side of the bed base 1, there is a front center structure 4, and on the other side, there is a rear center structure 5. The front center structure 4 and the rear center structure 5 respectively correspond to both ends of the shaft to be hobbed 31. The front center structure 4 has a front center component 41 that can rotate circumferentially, and a line contact positioning structure 6 for positioning the workpiece to be processed 3 and capable of making line contact with the blank surface 33 of the sector part 32 is arranged on the front center component 41. With the cooperation of the front center structure 4 and the rear center structure 5, and by using the line contact positioning structure 6, high-precision positioning of the workpiece to be processed 3 is achieved. At the same time, the end of the shaft to be hobbed 31 away from the sector part 32 is the part to be processed.

[0034] Combined with Figure 2 、 Figure 4 、 Figure 6 and Figure 10 As shown, the front center component 41 includes a front center seat 42. At one end of the front center seat 42, there is a front center head 43. At the end of the front center head 43 away from the front center seat 42, there is a front center body 44, and the front center head 43 is connected with a front center rotation servo motor 46 arranged at the other end of the front center seat 42 through a rotating inner cone sleeve 45 rotatably arranged in the front center seat 42. The front center rotation servo motor 46 in the front center component 41 can accurately control the rotation angle of the front center seat 42, and then drive the workpiece to be processed 3 to rotate precisely. The servo motor has the characteristics of fast response speed and high control precision, and can quickly and accurately adjust the position of the workpiece according to the processing requirements, improving the processing efficiency.

[0035] Combined with Figure 7 and Figure 9As shown in the figure, the line contact positioning structure 6 includes a front thimble positioning sleeve 61 fixedly coaxial with the front thimble head 43. The upper side of the front thimble positioning sleeve 61 has a front thimble positioning notch 62 that is recessed inward for one end of the shaft 31 to be gear-rolled to be inserted. The front thimble body 44 extends into the front thimble positioning notch 62 and abuts against one end of the shaft 31 to be gear-rolled. At one end of the front thimble positioning sleeve 61 away from the front thimble head 43, there are two positioning columns 63. The positioning columns 63 are parallel to each other and are respectively located on both sides of the front thimble positioning notch 62, and the positioning columns 63 respectively abut against the two blank surfaces 33 of the sector part 32. At one end of the front thimble positioning sleeve 61 away from the front thimble head 43, there is a workpiece bracket 64 located at the lower end of the front thimble positioning notch 62. The workpiece bracket 64 is bent, and one end has an arc-shaped groove 65 for placing the shaft 31 to be gear-rolled and corresponding to the front thimble body 44. The front thimble positioning sleeve 61 in the line contact positioning structure 6 has a front thimble positioning notch 62, which can accurately insert one end of the shaft 31 to be gear-rolled, and the front thimble body 44 abuts against one end of the shaft 31 to be gear-rolled, realizing axial positioning. At the same time, the two positioning columns 63 are in line contact with the blank surfaces 33 of the sector part 32 respectively, which can accurately limit the circumferential position of the workpiece 3 to be processed. In this way, compared with surface contact, the line contact method has higher positioning accuracy, can effectively reduce the positioning error, ensure the accuracy of processing, and the workpiece bracket 64 is bent and one end has an arc-shaped groove 65, which can be adjusted according to the shape and size of the shaft 31 to be gear-rolled, provides stable support for the workpiece 3 to be processed, and also facilitates the clamping and positioning of workpieces to be processed with different types and sizes, further enhancing the adaptability of the equipment.

[0036] Combined with Figure 2 and Figure 4 As shown in the figure, the front thimble structure 4 includes a front thimble cross beam 47. At the lower side of one end of the front thimble cross beam 47 away from the bed base 1, there is a front cross beam support rod 48. On the upper side of the front thimble cross beam 47, there is a front thimble slide 49 connected to the front thimble seat 42, and in the front thimble cross beam 47, there is a front thimble drive assembly 50 connected to the side of the front thimble slide 49 away from the front thimble seat 42.

[0037] Combined with Figure 2 and Figure 5As shown in the figure, the rear thimble structure 5 includes a rear thimble cross beam 51. A rear cross beam support rod 52 is provided on the lower side of one end of the rear thimble cross beam 51 away from the bed base 1. A rear thimble slide 53 is provided on the upper side of the rear thimble cross beam 51. A rear thimble seat 54 is provided on the upper side of the rear thimble slide 53. A rear thimble cone sleeve 55 is provided at one end of the rear thimble seat 54 close to the bed base 1. A rear thimble head 56 corresponding to the front thimble head 43 is provided inside the rear thimble cone sleeve 55. And a rear thimble drive assembly 57 connected to the rear thimble slide 53 is provided inside the rear thimble cross beam 51. The front thimble structure 4 and the rear thimble structure 5 respectively correspond to both ends of the gear shaft to be broached 31. Through the cooperation of the front thimble head 43 and the rear thimble head 56, the axis position of the workpiece to be processed 3 can be accurately determined, ensuring that the workpiece will not shake or shift during the processing, thereby improving the processing accuracy.

[0038] Combined Figure 1 with Figure 3 As shown in the figure, a bearing seat 12 is provided between the upper ends of the two columns 11. Motor brackets 13 are respectively provided at both ends on the upper side of the bearing seat 12. A broaching drive motor 14 is provided at the upper end of the motor bracket 13. And a broaching lead screw 15 axially penetrating the bearing seat 12 and connected to the broaching drive motor 14 is provided at the lower end of the motor bracket 13.

[0039] Among them, the broaching structure 2 includes a broaching slide 22 sleeved on the broaching lead screw 15. A lead screw nut 23 connected to the broaching lead screw 15 is provided on the inner side of the upper end of the broaching slide 22. A nut fixing seat 24 is provided between the lead screw nut 23 and the broaching slide 22. Broaching tool assemblies 25 are respectively provided on one side of the two corresponding broaching slides 22. The broaching gap 21 is located between the two broaching tool assemblies 25. And one side of the broaching slide 22 away from the broaching tool assembly 25 is located inside the column 11. The broaching drive motors 14 at the upper ends of the two columns 11 drive the broaching slides 22 to move through the broaching lead screws 15. The lead screw drive has the advantages of high transmission accuracy and good stability, can accurately control the position of the broaching slide 22, meet the gear processing requirements of different sizes and precisions, and also facilitates adjusting the broaching position according to the requirements during the processing.

[0040] At the same time, a high-precision indexing and convenient gear processing method, this method includes the following steps:

[0041] S1. Use line contact to roughly position the fan-shaped part 32 of the workpiece to be processed 3, and tighten both ends of the workpiece to be processed 3 through the front thimble structure 4 and the rear thimble structure 5;

[0042] S2. The front thimble drive assembly 50 controls the movement of the front thimble seat 42, and the rear thimble drive assembly 57 controls the movement of the rear thimble seat 54. After the front thimble seat 42 and the rear thimble seat 54 tighten the workpiece to be processed 3, they drive the workpiece to be processed 3 to start moving towards the broaching gap 21, forming a preliminary positioning of the broaching position;

[0043] S3. The two gear hobbing structures 2 operate alternately. During the operation, the workpiece 3 to be machined rotates along with them. When the linear velocities are inconsistent, the front center assembly 41 is used to control the rotation of the workpiece 3 to be machined for one full circle, so that the gear hobbing structure 2 just reaches the end position of one full circle of the workpiece 3 to be machined. Then, the rotation of the workpiece 3 to be machined is stopped, and then the gear hobbing stroke is completed.

[0044] Among them, in step S1, the blank surface 33 of the sector part 32 is fixed by the line contact positioning structure 6, and then the two ends of the workpiece 3 to be machined are tightened by the front center structure 4 and the rear center structure 5, so as to ensure accurate positioning each time.

[0045] Specifically, in steps S2 - S3, when the two gear hobbing structures 2 machine the workpiece 3 to be machined, when the linear velocities are inconsistent, the two gear hobbing structures 2 cannot contact the workpiece 3 to be machined simultaneously. The workpiece 3 to be machined needs to rotate one full circle driven by the front center rotation servo motor 46, so as to achieve accurate indexing. Then, the front center rotation servo motor 46 is disconnected, and then the gear hobbing stroke is completed. Due to the different specifications of the workpieces to be machined, there are differences between the machining circumferences of the workpieces to be machined and the machining lengths of the hob assemblies 25. During the machining process, the inconsistent linear velocities will be detected. Therefore, before actual machining, the workpiece 3 to be machined and the hob assembly 25 are respectively run for a certain stroke, their actual positions and speeds are measured, compared with the theoretical values, and then adjusted according to the deviations to ensure the accurate relative positions of the two during the operation.

[0046] The principle of this embodiment lies in:

[0047] The rough positioning of the blank surface 33 of the workpiece 3 to be machined is carried out by the line contact positioning structure 6. Then, the front center driving assembly 50 and the rear center driving assembly 57 are respectively used to control the movement of the front center seat 42 and the rear center seat 54. The front center head 43 and the rear center head 56 respectively tighten the two ends of the workpiece 3 to be machined, ensuring the accurate positioning of the workpiece 3 to be machined. After tightening the workpiece 3 to be machined, the front center seat 42 and the rear center seat 54 move synchronously and drive the workpiece 3 to move towards the gear hobbing gap 21. The two gear hobbing structures 2 operate alternately under the control of the gear hobbing driving motor 14, and the workpiece 3 to be machined rotates accordingly. If the linear velocities are inconsistent, the front center rotation servo motor 46 drives the workpiece 3 to be machined to rotate one full circle. When the workpiece 3 to be machined rotates one full circle, the gear hobbing structure 2 just reaches the end position of one full circle of the workpiece 3 to be machined, realizing accurate indexing. Subsequently, the front center rotation servo motor 46 is disconnected, and the gear hobbing structure 2 completes the gear hobbing stroke.

[0048] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0049] Although terms such as bed base 1, column 11, bearing block 12, motor frame 13, hobbing drive motor 14, hobbing lead screw 15, hobbing structure 2, hobbing clearance 21, hobbing slide 22, lead screw nut 23, nut fixing seat 24, hobbing tool assembly 25, workpiece to be machined 3, shaft to be hobbed 31, sector part 32, blank surface 33, front center structure 4, front center assembly 41, front center seat 42, front center head 43, front center body 44, rotating inner cone sleeve 45, front center rotating servo motor 46, front center cross beam 47, front cross beam support rod 48, front center slide 49, front center drive assembly 50, rear center structure 5, rear center cross beam 51, rear cross beam support rod 52, rear center slide 53, rear center seat 54, rear center cone sleeve 55, rear center head 56, rear center drive assembly 57, line contact positioning structure 6, front center positioning sleeve 61, front center positioning notch 62, positioning column 63, workpiece support 64, arc groove 65 are used more frequently in this text, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A gear processing device with high-precision indexing and convenience, comprising a bed base (1). On both sides of the upper end of the bed base (1), there are respectively vertically arranged columns (11). On one side corresponding to the two columns (11), there are respectively hobbing structures (2), and a hobbing gap (21) for accommodating a workpiece to be processed (3) is formed between the hobbing structures (2). It is characterized in that, The workpiece (3) to be processed has a shaft (31) to be gear-rolled, and one end of the shaft (31) to be gear-rolled is connected with a sector part (32) having blank surfaces (33) on both sides. On one side of the bed base (1), a front center structure (4) is provided, and on the other side, a rear center structure (5) is provided. The front center structure (4) and the rear center structure (5) respectively correspond to both ends of the shaft (31) to be gear-rolled. The front center structure (4) has a front center component (41) capable of circumferential rotation, and on the front center component (41), a line-contact positioning structure (6) for positioning the workpiece (3) to be processed and capable of line contact with the blank surfaces (33) of the sector part (32) is provided.

2. The high-precision indexing and convenient gear processing device according to claim 1, characterized in that, The front center component (41) includes a front center seat (42). At one end of the front center seat (42), a front center head (43) is provided. At the end of the front center head (43) far from the front center seat (42), there is a front center body (44). And the front center head (43) is connected to a front center rotation servo motor (46) arranged at the other end of the front center seat (42) through a rotating inner cone sleeve (45) rotatably arranged in the front center seat (42).

3. The high-precision indexing and convenient gear processing device according to claim 2, characterized in that, The line-contact positioning structure (6) includes a front center positioning sleeve (61) coaxially fixed with the front center head (43). On the upper side of the front center positioning sleeve (61), there is a front center positioning notch (62) which is recessed inward and for one end of the shaft (31) to be gear-rolled to be inserted. And the front center body (44) extends into the front center positioning notch (62) and abuts against one end of the shaft (31) to be gear-rolled. At the end of the front center positioning sleeve (61) far from the front center head (43), two positioning columns (63) are provided. The positioning columns (63) are parallel to each other and are respectively located on both sides of the front center positioning notch (62), and the positioning columns (63) respectively abut against the two blank surfaces (33) of the sector part (32). At the end of the front center positioning sleeve (61) far from the front center head (43), a workpiece support (64) is provided at the lower end of the front center positioning notch (62). The workpiece support (64) is bent, and one end has an arc-shaped groove (65) for placing the shaft (31) to be gear-rolled and corresponding to the front center body (44).

4. A high-precision indexing and convenient gear processing device according to claim 2 or 3, characterized in that, The front center structure (4) includes a front center cross beam (47). At the lower side of the end of the front center cross beam (47) far from the bed base (1), a front cross beam support rod (48) is provided. On the upper side of the front center cross beam (47), a front center slide (49) connected to the front center seat (42) is provided. And in the front center cross beam (47), a front center driving component (50) connected to the side of the front center slide (49) far from the front center seat (42) is provided.

5. A high-precision indexing and convenient gear processing device according to claim 2, characterized in that, The described rear thimble structure (5) includes a rear thimble cross beam (51). At the lower side of one end of the rear thimble cross beam (51) away from the bed base (1), there is a rear cross beam support rod (52). On the upper side of the rear thimble cross beam (51), there is a rear thimble slide (53). On the upper side of the rear thimble slide (53), there is a rear thimble seat (54). At one end of the rear thimble seat (54) close to the bed base (1), there is a rear thimble cone sleeve (55). Inside the rear thimble cone sleeve (55), there is a rear thimble head (56) corresponding to the front thimble head (43). And inside the rear thimble cross beam (51), there is a rear thimble drive assembly (57) connected to the rear thimble slide (53).

6. A high-precision indexing and convenient gear processing device according to claim 1, characterized in that, Between the upper ends of the two columns (11), there is a bearing seat (12). At the two ends of the upper side of the bearing seat (12), there are motor brackets (13) respectively. At the upper end of the motor bracket (13), there is a gear hobbing drive motor (14). And at the lower end of the motor bracket (13), there is a gear hobbing lead screw (15) axially passing through the bearing seat (12) and connected to the gear hobbing drive motor (14).

7. A high-precision indexing and convenient gear processing device according to claim 6, characterized in that, The described gear hobbing structure (2) includes a gear hobbing slide (22) sleeved on the gear hobbing lead screw (15). Inside the upper end of the gear hobbing slide (22), there is a lead screw nut (23) connected to the gear hobbing lead screw (15). Between the lead screw nut (23) and the gear hobbing slide (22), there is a nut fixing seat (24). On the corresponding sides of the two gear hobbing slides (22), there are gear hobbing tool assemblies (25) respectively. The gear hobbing gap (21) is located between the two gear hobbing tool assemblies (25). And on the side of the gear hobbing slide (22) away from the gear hobbing tool assembly (25), it is located inside the column (11).

8. A high-precision indexing and convenient gear processing method using a high-precision indexing and convenient gear processing device according to any one of claims 1-7, characterized in that, This method includes the following steps: S1. Coarsely position the sector part (32) of the workpiece to be machined (3) by line contact, and clamp both ends of the workpiece to be machined (3) through the front thimble structure (4) and the rear thimble structure (5). S2. The front thimble drive assembly (50) controls the movement of the front thimble seat (42), and the rear thimble drive assembly (57) controls the movement of the rear thimble seat (54). After the front thimble seat (42) and the rear thimble seat (54) clamp the workpiece to be machined (3), they drive the workpiece to be machined (3) to start moving towards the gear hobbing gap (21) direction, forming a preliminary positioning for the gear hobbing position. S3. The two gear hobbing structures (2) operate alternately. When operating, the workpiece to be machined (3) rotates along with it. When the linear speeds are inconsistent, the front thimble assembly (41) is required to control the workpiece to be machined (3) to rotate one circle, so that the gear hobbing structure (2) just reaches the end position of one full circle of the workpiece to be machined (3), then stop the rotation of the workpiece to be machined (3), and then complete the gear hobbing stroke.

9. A high-precision indexing and convenient gear processing method according to claim 8, characterized in that, In the step S1, the blank surface (33) of the sector part (32) is fixed through the line contact positioning structure (6), and then both ends of the workpiece to be machined (3) are clamped through the front thimble structure (4) and the rear thimble structure (5), so as to ensure accurate positioning each time.

10. A high-precision indexing and convenient gear processing method according to claim 8, characterized in that, In the steps S2 - S3, when machining the workpiece (3) to be machined by the two gear hobbing structures (2), if the linear velocities are inconsistent, the two gear hobbing structures (2) cannot contact the workpiece (3) to be machined simultaneously. The workpiece (3) to be machined needs to rotate one week driven by the front center rotation servo motor (46) to make the indexing accurate, then the front center rotation servo motor (46) is disconnected, and then the gear hobbing stroke is completed.

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