Axial multi-blade staged broaching forming equipment for internal gear tooth slot processing

Abstract

The application relates to the technical field of internal gear machining, and particularly relates to an axial multi-blade grading broaching forming equipment for internal gear tooth groove machining; the axial multi-blade grading broaching forming equipment comprises a connecting shaft, a dynamic broaching module, a first precise broaching module and a second precise broaching module; the dynamic broaching module is fixedly arranged at the front end of the connecting shaft and comprises a limiting bin, a plurality of first broaching heads and a driving unit; the driving unit comprises a driving screw rod, a driving column and a plurality of driving wedge blocks; the connecting end of each first broaching head is fixedly provided with an adjusting block; the lower end of the adjusting block is provided with a first sliding groove; the driving wedge block is in inclined surface sliding fit with the first sliding groove; the first precise broaching module and the second precise broaching module are coaxially arranged outside the connecting shaft; each of the first precise broaching module and the second precise broaching module comprises an inner connecting cylinder and a plurality of coaxial detachable broaching rings arranged outside the inner connecting cylinder; the second broaching heads on the plurality of broaching rings are arranged in a step-increasing manner in the broaching direction; the plurality of first broaching heads and the plurality of second broaching heads jointly form an axial multi-blade grading broaching chain; and the two precise broaching modules are arranged in a staggered manner in the circumferential direction.

Description

Technical Field

[0001] This invention relates to the field of internal gear machining technology, specifically to an axial multi-blade graded broaching forming device for machining internal gear tooth grooves. Background Technology

[0002] In the machining of internal gears, broaching is widely used for forming the tooth grooves of internal gears due to its high machining efficiency, good tooth profile consistency, and suitability for mass production.

[0003] However, existing internal gear broaching equipment still has certain limitations in practical applications. First, since the broaching depth and trajectory of each broaching tooth are basically fixed after manufacturing, when machining internal gears with different modules, tooth depths, or tooth groove structures, it is often necessary to replace the entire broaching set, increasing tool manufacturing and maintenance costs. Second, traditional broaches typically use a fixed broaching amount for step-by-step broaching during the broaching process. When there are deviations in the pre-machined dimensions of the workpiece or uneven local hardness of the material, it is easy to cause concentrated broaching loads on some teeth, resulting in accelerated tool wear, increased machining vibration, and decreased tooth surface quality. Third, in existing broaching structures, each level of broaching teeth adopts a fixed arrangement, and the force impact during the broaching process is mainly concentrated on a single axial path, which easily leads to large instantaneous broaching resistance, which is not conducive to improving machining stability and tool life. Fourth, for internal gear products with different tooth groove depths or different forming requirements, traditional equipment lacks a structure that can flexibly adjust the broaching level and trajectory according to machining needs, resulting in insufficient equipment adaptability and difficulty in balancing machining accuracy and production efficiency. Fifth, most existing internal gear broaching equipment relies on a single broaching trajectory to complete the tooth groove forming, lacking a graded broaching control structure for different processing stages. This causes a large amount of chips generated during the roughing stage to easily accumulate inside the tooth groove, which not only increases the resistance of subsequent broaching but may also cause problems such as tooth surface scratches, increased tooth profile errors, and abnormal tool wear.

[0004] Furthermore, during continuous batch processing, as the wear of the cutting tools increases, traditional integral broaches are difficult to quickly adjust or replace in localized worn areas. They usually require overall re-grinding or replacement, which not only increases downtime but also easily affects the processing consistency of different batches of products. Summary of the Invention

[0005] To address the aforementioned issues, an axial multi-blade graded broaching forming device for machining internal gear tooth grooves is provided. By proposing a device capable of grading and multi-blade broaching internal gears, the technical problems of insufficient adaptability, large broaching impact, poor machining stability, high tool maintenance costs, and easy accumulation of chips in the tooth grooves of existing broaching equipment are solved.

[0006] To address the problems of existing technologies, this invention provides an axial multi-blade graded broaching forming device for machining internal gear tooth grooves. The device comprises: a connecting shaft; a dynamic broaching module fixedly disposed at the front end of the connecting shaft, the dynamic broaching module having multiple first broaching heads and a drive unit capable of driving the multiple first broaching heads to extend and retract radially; a first precision broaching module coaxially disposed outside the connecting shaft and near its center; and a second precision broaching module coaxially disposed outside the connecting shaft and near its rear end. Both the first and second precision broaching modules have multiple second broaching heads arranged axially along the connecting shaft; the multiple first broaching heads and the multiple second broaching heads are arranged with progressively increasing broaching heights along the broaching direction to form an axial multi-blade graded broaching chain; the first precision broaching module and the second precision broaching module are circumferentially offset for graded broaching forming of internal gear tooth grooves.

[0007] Preferably, the dynamic broaching module further includes a limiting chamber; a plurality of first broaching heads are radially slidably disposed within the limiting chamber; the plurality of first broaching heads are circumferentially spaced along the axis of the limiting chamber; the plurality of first broaching heads in the dynamic broaching module are all radially slidably disposed within the limiting chamber and are evenly distributed circumferentially along the axis of the limiting chamber; when the dynamic broaching module enters the interior of the internal gear, each first broaching head can synchronously broach different tooth groove areas of the internal gear respectively.

[0008] Preferably, the drive unit is provided with an adjustment block that can radially adjust the broaching stroke of the first broaching head and a drive wedge that can drive the adjustment block to adjust; the lower end of the adjustment block is also provided with a first sliding groove that slides with the drive wedge; the adjustment block is fixedly disposed at the connecting end of the first broaching head; the drive wedge slides with the first sliding groove.

[0009] Preferably, the drive unit further includes a drive column and a drive screw capable of driving the drive column to slide along its axis within the limiting chamber; a plurality of drive wedges are radially fixed outside the drive column and are arranged circumferentially along the axis of the drive column; the drive screw is coaxially screwed into the limiting chamber, and the drive end is rotatably connected to the limiting chamber.

[0010] Preferably, the plurality of first broaching heads can be detachably mounted on the top of the adjusting block; the plurality of first broaching heads are arranged with the broaching height increasing progressively along the broaching direction.

[0011] Preferably, the first precision broaching module is provided with an inner connecting cylinder and a plurality of broaching rings coaxially and detachably disposed outside the inner connecting cylinder; a plurality of second broaching heads are circumferentially fixed outside the plurality of broaching rings.

[0012] Preferably, the plurality of broaching rings are arranged sequentially along the axial direction of the connecting shaft; the second broaching heads on the plurality of broaching rings are arranged with the broaching height increasing step by step along the broaching direction.

[0013] Preferably, the first precision broaching module and the second precision broaching module have the same structure; the second broaching head on the first precision broaching module and the second broaching head on the second precision broaching module are circumferentially offset and the second broaching head on the first precision broaching module is located between two adjacent second broaching heads on the second precision broaching module.

[0014] The advantages of this invention compared to the prior art are:

[0015] 1. This invention sets up a dynamic broaching module, a first precision broaching module, and a second precision broaching module, and forms an axial multi-blade graded broaching chain with multiple first broaching heads and multiple second broaching heads along the broaching direction, so that the total broaching allowance of the internal gear tooth groove is distributed to multiple broaching units and completed step by step. Compared with the traditional single-stage broaching method, it can effectively reduce the broaching load and broaching impact of a single broaching head, reduce tool wear, and improve the dimensional accuracy of the tooth groove. Even if there are deviations in the pre-processed dimensions of the workpiece or uneven local hardness of the material, the range of broaching load fluctuation borne by a single broaching tooth is effectively compressed because the broaching allowance is distributed to multiple broaching units, avoiding the phenomenon of concentrated broaching load on the tooth.

[0016] 2. This invention features a radially adjustable and replaceable first broaching head via a dynamic broaching module. The radial extension of the first broaching head can be adjusted via a drive unit, thereby changing the broaching depth during the rough broaching stage. Simultaneously, the first broaching head employs a modular replacement structure, allowing for quick replacement of the corresponding cutter head according to different internal gear specifications, eliminating the need for a complete broach replacement. This significantly improves the equipment's adaptability to internal gears with different numbers of teeth, modules, and tooth groove sizes, reducing operating costs and changeover time. Furthermore, because the first broaching head uses a modular replacement structure, there is no need to replace the entire broaching set, significantly reducing tool replacement and maintenance costs.

[0017] 3. By designing the first precision broaching module and the second precision broaching module to be coaxially arranged and circumferentially staggered, the original concentrated distribution of precision broaching teeth is dispersed to the two precision broaching modules, and a larger chip removal space is formed between adjacent broaching areas. This can effectively improve the chip accumulation, chip blockage and chip jamming phenomena that are easy to occur in traditional high tooth density broaches, while reducing broaching heat accumulation and processing vibration. Attached Figure Description

[0018] Figure 1 This is a perspective view of an axial multi-blade graded broaching forming device for machining internal gear tooth grooves.

[0019] Figure 2 This is a side view of an axial multi-blade graded broaching forming device for machining internal gear tooth grooves.

[0020] Figure 3 yes Figure 2 Sectional view at point AA.

[0021] Figure 4 yes Figure 3 A magnified view of section B.

[0022] Figure 5 This is an exploded 3D view of the dynamic broaching module in an axial multi-blade graded broaching forming equipment for machining internal gear tooth grooves.

[0023] Figure 6 This is an exploded perspective view of a portion of the structure of an axial multi-blade graded broaching forming equipment for machining internal gear teeth, excluding the dynamic broaching module.

[0024] Figure 7 This is a side view of an axial multi-blade graded broaching forming device for machining internal gear tooth grooves.

[0025] Figure 8 yes Figure 7 Sectional view at point CC.

[0026] The numbers on the map are:

[0027] 1. Connecting shaft; 11. Third slide groove;

[0028] 2. Dynamic broaching module; 21. First broaching head; 22. Drive unit; 221. Adjusting block; 222. Drive wedge block; 223. First slide groove; 224. Drive column; 225. Drive screw; 23. Limiting chamber;

[0029] 3. First precision broaching module; 31. Second broaching head; 32. Inner connecting cylinder; 33. Broaching ring; 34. Second slide groove; 35. Locking bolt; 36. Slide rail;

[0030] 4. Second precision broaching module. Detailed Implementation

[0031] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0032] See Figures 1 to 8As shown: An axial multi-blade graded broaching forming device for machining internal gear tooth grooves includes: a connecting shaft 1; a dynamic broaching module 2, fixedly disposed at the front end of the connecting shaft 1, the dynamic broaching module 2 having a plurality of first broaching heads 21 and a drive unit 22 capable of driving the plurality of first broaching heads 21 to extend and retract radially; a first precision broaching module 3, coaxially disposed outside the connecting shaft 1 and near the middle of the connecting shaft 1; a second precision broaching module 4, coaxially disposed outside the connecting shaft 1 and near the rear end of the connecting shaft 1; wherein, both the first precision broaching module 3 and the second precision broaching module 4 have a plurality of second broaching heads 31 arranged axially along the connecting shaft 1; the plurality of first broaching heads 21 and the plurality of second broaching heads 31 are arranged with progressively increasing broaching height along the broaching direction to form an axial multi-blade graded broaching chain; the first precision broaching module 3 and the second precision broaching module 4 are circumferentially offset to perform graded broaching forming of internal gear tooth grooves.

[0033] The dynamic broaching module 2 is used to perform rough broaching on the internal gear tooth groove; the first precision broaching module 3 and the second precision broaching module 4 are used to perform fine broaching on the tooth groove after rough broaching; so that the total broaching amount of the internal gear tooth groove is jointly borne by the dynamic broaching module 2, the first precision broaching module 3 and the second precision broaching module 4, thereby reducing the broaching load of a single broaching head and improving the chip removal capacity.

[0034] When broaching is required on the internal gear tooth groove, the internal gear to be processed is first installed on the corresponding clamping fixture, and the connecting shaft 1 is connected to the external broaching drive equipment. During the broaching process, the connecting shaft 1 moves axially along the axis of the internal gear, and the dynamic broaching module 2 at the foremost end first enters the interior of the internal gear and contacts the tooth groove area. Multiple first broaching heads 21 sequentially broach the tooth groove in a progressively increasing broaching height manner, so that the material inside the tooth groove is removed layer by layer, thereby completing the rough broaching process.

[0035] After the dynamic broaching module 2 completes the initial broaching, the first precision broaching module 3 continues to enter the tooth groove. Multiple second broaching heads 31 sequentially refine the rough broached tooth groove along the axial direction to improve the contour accuracy and dimensional consistency of the tooth groove. Subsequently, the second precision broaching module 4 continues to perform final finishing on the tooth groove. Because the first precision broaching module 3 and the second precision broaching module 4 are staggered circumferentially, the second broaching heads 31 on the two modules undertake broaching tasks in different areas, thereby avoiding broaching vibration and chip removal problems caused by excessive broaching load in a single area.

[0036] Since multiple first broaching heads 21 and multiple second broaching heads 31 together form an axial multi-blade graded broaching chain with progressively increasing broaching height, the broaching allowance in the entire tooth groove machining process is distributed to multiple broaching units to be completed step by step, effectively reducing the broaching load on a single tooth and improving the tooth groove forming accuracy and machining stability.

[0037] A third groove 11 is also provided on the outer axis of the connecting shaft 1 to limit the installation of the first precision broaching module 3 and the second precision broaching module 4.

[0038] See Figure 7 As shown: The dynamic broaching module 2 further includes a limiting chamber 23; a plurality of first broaching heads 21 are radially slidably disposed within the limiting chamber 23; the plurality of first broaching heads 21 are circumferentially spaced along the axis of the limiting chamber 23; the plurality of first broaching heads 21 in the dynamic broaching module 2 are all radially slidably disposed within the limiting chamber 23 and are evenly distributed circumferentially along the axis of the limiting chamber 23; when the dynamic broaching module 2 enters the interior of the internal gear, each first broaching head 21 can synchronously broach different tooth groove areas of the internal gear respectively.

[0039] Because the first broaching head 21 adopts a radial sliding structure, it can be adaptively adjusted according to the tooth groove size requirements of internal gears of different specifications. This allows the dynamic broaching module 2 to not only complete rough broaching but also adapt to the processing requirements of different types of internal gears. At the same time, with multiple first broaching heads 21 distributed circumferentially, multiple tooth groove areas can be processed simultaneously, reducing single-point stress phenomena.

[0040] By using multiple radially adjustable first broaching heads 21, the machining of internal gears of different specifications can be adapted, and the machining efficiency of the rough broaching stage can be improved.

[0041] See Figure 5 and Figure 8 As shown: The drive unit 22 is provided with an adjustment block 221 that can radially adjust the broaching stroke of the first broaching head 21 and a drive wedge 222 that can drive the adjustment block 221 to adjust; the lower end of the adjustment block 221 is also provided with a first sliding groove 223 that slides with the drive wedge 222; the adjustment block 221 is fixedly disposed at the connecting end of the first broaching head 21; the drive wedge 222 slides with the first sliding groove 223.

[0042] When it is necessary to adjust the broaching dimension of the dynamic broaching module 2, the drive wedge 222 can be driven to move in a predetermined direction. Since the drive wedge 222 and the adjusting block 221 form an inclined sliding fit through the first slide groove 223, the axial displacement of the drive wedge 222 can be converted into the radial displacement of the adjusting block 221.

[0043] During the movement of the adjusting block 221, the corresponding first broaching head 21 is driven to extend and retract radially in sync, thereby changing the length of the first broaching head 21 extending outside the limiting chamber 23. By adjusting the radial extension of different first broaching heads 21, the rough broaching depth and broaching allowance distribution can be adjusted, so that the dynamic broaching module 2 can adapt to different tooth groove sizes and processing requirements.

[0044] See Figure 8 As shown: The drive unit 22 further includes a drive column 224 and a drive screw 225 capable of driving the drive column 224 to slide along its axis within the limiting chamber 23; a plurality of drive wedges 222 are radially fixed outside the drive column 224 and are arranged circumferentially along the axis of the drive column 224; the drive screw 225 is coaxially screwed into the limiting chamber 23, and the drive end is rotatably connected to the limiting chamber 23.

[0045] Furthermore, the drive column 224 is disposed inside the limiting chamber 23, and the plurality of drive wedges 222 are fixedly disposed on the top of the drive column 224. When the drive screw 225 rotates, the drive column 224 moves axially along the limiting chamber 23, and simultaneously drives the plurality of adjusting blocks 221 to move.

[0046] Since multiple adjusting blocks 221 are linked with corresponding driving wedges 222, the movement of the driving column 224 can simultaneously control multiple first broaching heads 21 to adjust synchronously, ensuring that the multiple first broaching heads 21 always maintain a consistent radial extension and retraction, thus avoiding broaching height errors between the broaching heads. At the same time, the driving screw 225 uses a threaded transmission method, enabling fine adjustment and improving the adjustment accuracy of the dynamic broaching module 2.

[0047] See Figure 5 and Figure 8 As shown: multiple first broaching heads 21 can be detachably mounted on the top of the adjusting block 221; multiple first broaching heads 21 are arranged with broaching height increasing step by step along the broaching direction.

[0048] Multiple first broaching heads 21 are detachably mounted on the top of corresponding adjusting blocks 221. When it is necessary to process internal gears with different tooth profile parameters or different modules, the original first broaching head 21 can be directly disassembled and replaced with a first broaching head 21 of the corresponding specification.

[0049] Meanwhile, multiple first broaching heads 21 are arranged with progressively increasing broaching height along the broaching direction. This allows the first broaching head 21 at the front to complete a small amount of broaching initially, while subsequent first broaching heads 21 continue to gradually increase the broaching depth, thus forming a stepped rough broaching process. Through the above structural design, it is possible to avoid the phenomenon of chipping or vibration caused by a single broaching head bearing too large a broaching amount at one time.

[0050] See Figure 6 As shown: The first precision broaching module 3 is provided with an inner connecting cylinder 32 and a plurality of broaching rings 33 coaxially and detachably disposed outside the inner connecting cylinder 32; a plurality of second broaching heads 31 are circumferentially fixed outside the plurality of broaching rings 33.

[0051] In the first precision broaching module 3, multiple broaching rings 33 are coaxially mounted on the outside of the inner connecting cylinder 32, and each broaching ring 33 can be independently disassembled and assembled. Multiple second broaching heads 31 are fixedly disposed on the outer periphery of the corresponding broaching ring 33.

[0052] When precision machining of internal gears of different specifications is required, the corresponding broaching ring 33 or the second broaching head 31 can be replaced according to the tooth groove size requirements, without having to replace the entire broaching module, thereby reducing maintenance and usage costs.

[0053] Meanwhile, each broaching ring 33 forms an independent broaching unit, allowing for a more even distribution of the broaching allowance during the fine broaching process. A second sliding groove 34 is also provided within the broaching ring. Slide rails 36 are respectively provided on the inner and outer sides of the inner connecting cylinder 32, allowing for sliding engagement with the third sliding groove 11 located outside the connecting shaft 1 and the second sliding groove 34 located within the broaching ring. The broaching ring 33 is detachably fixed to the outside of the inner connecting cylinder 32 by locking bolts 35. After loosening the locking bolts 35, the broaching ring 33 can slide out along the slide rails 36 of the inner connecting cylinder 32, thus enabling independent disassembly and replacement of the broaching ring 33.

[0054] See Figure 6 As shown: multiple broaching rings 33 are arranged sequentially along the axial direction of the connecting shaft 1; the second broaching heads 31 on the multiple broaching rings 33 are arranged with the broaching height increasing step by step along the broaching direction.

[0055] Multiple broaching rings 33 are arranged sequentially along the connecting shaft 1, and the second broaching head 31 on each broaching ring 33 is arranged with the broaching height increasing step by step along the broaching direction.

[0056] Among them, the second broaching head 31 at the front end and the first broaching head 21 at the rear end of the dynamic broaching module 2 form a continuous connection in broaching height, so that there is a continuous transition between the rough broaching stage and the fine broaching stage, and there will be no sudden broaching step phenomenon.

[0057] As the connecting shaft 1 continues to advance, each of the second broaching heads 31 sequentially performs fine finishing on the tooth groove, making the tooth groove size gradually approach the final forming size, thereby improving the surface quality and contour accuracy of the tooth groove.

[0058] See Figure 1 and Figure 6As shown: the first precision broaching module 3 and the second precision broaching module 4 have the same structure; the second broaching head 31 on the first precision broaching module 3 and the second broaching head 31 on the second precision broaching module 4 are circumferentially offset and the second broaching head 31 on the first precision broaching module 3 is located between two adjacent second broaching heads 31 on the second precision broaching module 4.

[0059] After the first precision broaching module 3 completes the first round of finishing, the second broaching head 31 in the second precision broaching module 4 enters the corresponding tooth groove area to continue processing. Since the two sets of second broaching heads 31 are staggered in the circumferential direction and do not overlap in the angular direction, the total number of broaching teeth is distributed across the two precision broaching modules.

[0060] At the same time, a larger chip removal space is formed between adjacent broaching teeth, allowing the chips generated during the machining process to be discharged smoothly, thereby reducing the risk of blockage caused by chip accumulation and reducing the phenomenon of broaching heat concentration.

[0061] Furthermore, the circumferentially offset structure can reduce continuous broaching impact and improve stability and machining accuracy during the broaching process. By circumferentially offsetting the dual precision broaching modules, the broaching load is distributed, the chip removal space is increased, and machining accuracy is improved.

[0062] This invention enables graded and multi-bladed dynamic broaching of internal gears, significantly improving broaching accuracy and machining stability.

[0063] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. An axial multi-blade graded broaching forming device for machining internal gear tooth grooves, characterized in that, include: Connecting shaft; A dynamic broaching module is fixedly mounted at the front end of the connecting shaft. The dynamic broaching module includes a limiting chamber, multiple first broaching heads, and a drive unit capable of driving the multiple first broaching heads to extend and retract radially. The multiple first broaching heads are radially slidably disposed within the limiting chamber and spaced circumferentially along the axis of the limiting chamber. The drive unit includes a drive screw, a drive column, and multiple drive wedges. The drive column is axially slidably disposed within the limiting chamber, and the multiple drive wedges are fixedly disposed outside the drive column circumferentially. An adjusting block is fixedly disposed at the connecting end of each first broaching head. A first sliding groove is formed at the lower end of the adjusting block, and the drive wedges form an inclined sliding engagement with the first sliding groove to convert the axial displacement of the drive column into the radial extension and retraction of the first broaching head. A first precision broaching module is coaxially disposed outside the connecting shaft and near the middle of the connecting shaft. The first precision broaching module includes an inner connecting cylinder and a plurality of broaching rings coaxially and detachably disposed outside the inner connecting cylinder. The plurality of broaching rings are arranged sequentially along the axial direction of the connecting shaft. A plurality of second broaching heads are respectively circumferentially fixed outside the plurality of broaching rings. The second broaching heads on the plurality of broaching rings are arranged with the broaching height increasing stepwise along the broaching direction. The second precision broaching module is coaxially disposed outside the connecting shaft and near the rear end of the connecting shaft. The second precision broaching module has the same structure as the first precision broaching module. In this configuration, multiple first broaching heads and multiple second broaching heads are arranged together along the broaching direction with progressively increasing broaching height to form an axial multi-blade graded broaching chain; the first precision broaching module and the second precision broaching module are staggered along the circumferential direction, and the second broaching head on the first precision broaching module is located between two adjacent second broaching heads on the second precision broaching module.

2. The axial multi-blade graded broaching forming equipment for machining internal gear tooth grooves according to claim 1, characterized in that, Multiple first broaching heads are evenly distributed circumferentially along the axis of the limiting chamber, so as to perform synchronous broaching on different tooth groove areas of the internal gear after the dynamic broaching module enters the internal gear.

3. The axial multi-blade graded broaching forming equipment for machining internal gear tooth grooves according to claim 1, characterized in that, The drive screw is coaxially screwed into the limiting chamber, and the drive end of the drive screw is rotatably connected to the limiting chamber, so as to drive the drive column to slide axially within the limiting chamber through the rotation of the drive screw.

4. The axial multi-blade graded broaching forming equipment for machining internal gear tooth grooves according to claim 1, characterized in that, Multiple first broaching heads can be detachably mounted on the top of the adjusting block, and the multiple first broaching heads are arranged with the broaching height increasing step by step along the broaching direction.

5. The axial multi-blade graded broaching forming equipment for machining internal gear tooth grooves according to claim 1, characterized in that, The outer wall of the connecting shaft is provided with a third sliding groove along the axial direction; the inner and outer sides of the inner connecting cylinder are respectively provided with sliding rails, the sliding rail on the outer side of the inner connecting cylinder is slidably engaged with the third sliding groove of the connecting shaft, and the sliding rail on the inner side of the inner connecting cylinder is slidably engaged with the second sliding groove opened in the broaching ring.

6. An axial multi-blade graded broaching forming device for machining internal gear tooth grooves according to claim 1 or 5, characterized in that, The broaching ring is detachably fixed to the outside of the inner connecting cylinder by a locking bolt. After loosening the locking bolt, the broaching ring can slide out along the slide rail of the inner connecting cylinder.

7. The axial multi-blade graded broaching forming equipment for machining internal gear tooth grooves according to claim 1, characterized in that, The second broaching head at the foremost end and the first broaching head at the rearmost end of the dynamic broaching module are connected in broaching height along the broaching direction to form a continuous transition between the rough broaching stage and the fine broaching stage.

8. The axial multi-blade graded broaching forming equipment for machining internal gear tooth grooves according to claim 1, characterized in that, The dynamic broaching module is used to perform rough broaching on the internal gear tooth groove, and the first precision broaching module and the second precision broaching module are used to perform fine broaching on the tooth groove after rough broaching. The total broaching amount of the internal gear tooth groove is jointly undertaken by the dynamic broaching module, the first precision broaching module and the second precision broaching module.

9. The axial multi-blade graded broaching forming equipment for machining internal gear tooth grooves according to claim 1, characterized in that, The plurality of drive wedges are arranged circumferentially along the top of the drive column, and the plurality of drive wedges synchronously drive the plurality of adjustment blocks to perform radial displacement through the axial movement of the drive column, so as to keep the plurality of first broaching heads at a consistent radial extension and retraction amount.

10. An axial multi-blade graded broaching forming device for machining internal gear tooth grooves according to claim 1, characterized in that, The first precision broaching module and the second precision broaching module are staggered in the circumferential direction, and the second broaching heads on the two precision broaching modules are arranged at equal angular intervals in the circumferential direction, so that a chip removal space is formed between the second broaching heads on the two precision broaching modules.

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