Thin-wall external tooth hobbing tool

Abstract

The utility model discloses a thin-wall external gear hobbing tool, and relates to the technical field of thin-wall gear ring machining, the hobbing tool comprises a machine tool base, a base mandrel and a locking piece, the machine tool base is vertically positioned and installed on a workbench of a gear hobbing machine; the base mandrel comprises a first mandrel section, a second mandrel section and a third mandrel section which are coaxially connected in sequence, the center of the first mandrel section is positioned and installed on a workbench of the gear hobbing machine and located in the center of the interior of the machine tool base, a second inner spigot is formed in the bottom of the second mandrel section, and a second inner spigot is formed in the bottom of the third mandrel section. The second mandrel section is positioned and mounted on the machine tool base through a second female end, and the top of the third mandrel section is suitable for being axially inserted into an inner hole of the thin-wall outer gear ring, so that the thin-wall outer gear ring is in an inverted suspension state; the locking piece is vertically and axially connected to the third core shaft section and the thin-wall outer gear ring in a pressing mode. The problem that the outer gear ring is clamped by a tension mechanism to deform is solved, the service life is long, the safety performance is high, and the working efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of thin-wall gear ring processing, in particular to a thin-wall external gear hobbing tool. Background Art

[0002] Thin-walled gear rings are widely used parts. At present, three-jaw chucks are generally used to clamp the inner hole of the gear ring in the process of fine turning the outer cylindrical surface. Due to the thin wall thickness of the thin-walled gear ring, the gear ring is easy to deform after being stressed, so the processing accuracy cannot be guaranteed. In addition, the loading and unloading of the gear ring is completely manual, and the clamping efficiency is low.

[0003] Thin-walled gear rings have poor structural rigidity and are very sensitive to radial forces. They are easily deformed by the impact of clamping and cutting during the forming process. In order to reduce the impact of external forces on processing quality.

[0004] At present, there are two main types of fixtures for external gear ring gear hobbing, one is a solid core shaft and the other is an expansion core shaft. The solid core shaft fixture has a simple structure, is easy to clamp, and has a low manufacturing cost. However, the solid core shaft and the inner hole of the matching external gear ring are clearance-matched. Under the action of the impact force of the slotting during the slotting process, the workpiece and the core shaft are easily offset, resulting in insufficient quality accuracy of the slotted external gear ring. The expansion core shaft fixture is a fixture that uses a built-in expansion sleeve to expand the inner hole of the external gear ring to eliminate the matching clearance, thereby improving the gear slotting accuracy. Despite this, the quality of the external gear ring slotted with the expansion core shaft fixture is still unstable. The expansion core shaft fixture relies on the elastic deformation of the expansion sleeve to expand the inner hole of the workpiece, because the elastic deformation of the expansion sleeve is mainly controlled by the uniformity of the preset opening groove on the outer wall and the quality of heat treatment. In reality, the elastic deformation of the expansion sleeve generally does not meet the design requirements, so the expansion core shaft fixture is still not the best fixture for external gear ring gear slotting. Utility Model Content

[0005] The main purpose of the utility model is to provide a thin-walled external gear hobbing tool, aiming to solve the technical problem that the existing tooling easily causes the thin-walled external gear ring to be clamped and deformed by a tension mechanism.

[0006] In order to achieve the above-mentioned purpose, the utility model proposes a thin-walled external gear hobbing tool, which is used to realize the clamping and positioning of the thin-walled external gear ring. The thin-walled external gear hobbing tool comprises:

[0007] The machine tool base is vertically positioned and installed on the gear hobbing machine workbench, and the machine tool base is a stepped cylindrical component;

[0008] A base mandrel, comprising a first mandrel segment, a second mandrel segment and a third mandrel segment which are coaxially connected in sequence, wherein the center of the first mandrel segment is positioned and installed on the workbench of the gear hobbing machine and is located at the inner center of the machine tool base, a second inner stop is provided at the bottom of the second mandrel segment, and the second mandrel segment is positioned and installed on the machine tool base through the second inner stop, and the top of the third mandrel segment is suitable for axial insertion into the inner hole of the thin-walled outer gear ring, so that the thin-walled outer gear ring is in an inverted suspended state;

[0009] The locking piece is vertically and axially pressed and connected to the third core shaft segment and the thin-walled outer gear ring.

[0010] Optionally, the machine tool base comprises a first barrel section and a second barrel section which are coaxially connected in sequence, and a coaxial first inner stop is provided at the bottom of the second barrel section;

[0011] The gear hobbing machine comprises a workbench located at the top, and the first inner stop is suitable for being positioned and installed on a first shaft shoulder of the workbench.

[0012] Optionally, the first inner stop is equal to the first shoulder in depth.

[0013] Optionally, the outer diameters of the second barrel section and the top end of the workbench are equal, and the second barrel section and the workbench are fixedly connected via a fourth locking member.

[0014] Optionally, the inner diameter of the first barrel section is equal to the outer diameter of the second inner stop, the outer diameter of the first barrel section is equal to the outer diameter of the second core shaft section, and the first barrel section and the second core shaft section are fixedly connected by a first locking member.

[0015] Optionally, the thin-walled outer gear ring includes a coaxially connected tooth root portion and a gear ring portion, and the gear ring portion is a thin-walled cylindrical structure, a gear ring is provided on the side of the gear ring portion away from the tooth root portion, and the outer diameter of the third core shaft segment is equal to the inner diameter of the gear ring portion.

[0016] Optionally, the locking member is a first hexagon socket screw, and a vertically arranged bolt hole is opened in the center of the third core shaft segment and the tooth root portion, and the first hexagon socket screw is suitable for being threadedly connected in the bolt hole to fix the third core shaft segment and the tooth root portion.

[0017] Optionally, the first locking piece is a hexagon socket screw, and the second core shaft segment is provided with a plurality of evenly distributed vertical through-connecting holes, the vertical through-connecting holes include a countersunk hole and a first through hole coaxially connected in sequence, the first cylinder segment is provided with a coaxial vertical first screw hole opposite to the vertical through-connecting hole, the hexagon socket screw is suitable for being inserted into the through-connecting hole and the first screw hole, and when the nut of the first screw hole abuts against the countersunk hole, the second core shaft segment is fixedly connected to the first cylinder segment.

[0018] Optionally, the gear hobbing machine further comprises a first base connected to the workbench, the first base and the workbench are fixedly connected via a second locking member, and the bottom of the first base is fixedly connected to the ground via a third locking member.

[0019] Optionally, the diameter of the first mandrel segment is smaller than the diameter of the third mandrel segment, and the diameter of the third mandrel segment is smaller than the diameter of the second mandrel segment.

[0020] Compared with the prior art, the beneficial effects of the utility model are:

[0021] In the technical solution of the utility model, the thin-walled external gear hobbing tool consists of a machine tool base, a base spindle and a locking member. The machine tool base is a basic component, which is a stepped cylindrical component and is vertically positioned and installed on the workbench of the gear hobbing machine, and is positioned and connected. The base spindle consists of a first spindle segment, a second spindle segment and a third spindle segment. The three spindle segments are coaxially connected in sequence. The first spindle segment set at the bottom is positioned and installed on the workbench of the gear hobbing machine as a supporting and positioning component, and is coaxial with the center of the machine tool base. The bottom of the second spindle segment is provided with a second inner stop. The second spindle segment is positioned and installed on the machine tool base through the second inner stop, ensuring the verticality and stability of the base spindle. The third spindle segment is a component for supporting and positioning the thin-walled external gear ring. It is directly inserted into the inner hole of the thin-walled external gear ring and is interference fit with the inner hole, so that the thin-walled external gear ring is in an inverted suspension state; finally, it is vertically axially pressed and connected to the third spindle segment and the thin-walled external gear ring through the locking member, avoiding the problem of the external gear ring being clamped and deformed. By adopting the gear hobbing tooling with the above structure, the thin-walled outer gear ring is not subjected to any radial force during the positioning, clamping and gear hobbing processes, which can not only ensure the processing accuracy of the teeth of the thin-walled outer gear ring, but also prevent the thin-walled section from deformation. The processing quality fully meets the matching requirements, and the deformation of the outer gear ring caused by the tension mechanism is avoided. In addition, the tooling has a long service life, high safety performance, high work efficiency and good precision maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0023] Figure 1 A schematic cross-sectional view of a thin-walled external gear hobbing tooling provided in an embodiment of the utility model;

[0024] Figure 2 This is a schematic diagram of the internal structure of the machine tool base in the embodiment of the utility model;

[0025] Figure 3 It is a schematic diagram of the assembly structure of the base core shaft and the thin-walled outer gear ring in the embodiment of the utility model;

[0026] Figure 4 This is a schematic diagram of the structure of the thin-walled outer gear ring in the embodiment of the utility model;

[0027] Figure 5 It is a structural schematic diagram of a gear hobbing machine in an embodiment of the utility model.

[0028] Description of Figure Numbers:

[0029] 1-machine tool base; 11-first barrel section; 111-first screw hole; 12-second barrel section; 121-first inner stop; 122-first bolt hole;

[0030] 2-base mandrel; 21-first mandrel section; 22-second mandrel section; 221-second inner stop; 222-counterbore; 223-first through hole; 23-third mandrel section; 231-second bolt hole;

[0031] 3-thin-wall outer gear ring; 31-tooth root; 32-gear ring; 321-gear ring;

[0032] 4-First hexagon socket screw;

[0033] 5-first locking member;

[0034] 6- gear hobbing machine; 61- first base; 62- workbench; 621- first shaft shoulder;

[0035] 7- second locking member;

[0036] 8-the third locking piece; 9-the fourth locking piece. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0039] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0040] See also Figure 1-4 As shown, the utility model provides a thin-walled external gear hobbing tool for clamping and positioning a thin-walled external gear ring 3. The thin-walled external gear hobbing tool comprises a machine tool base 1, a base spindle 2 and a locking member, wherein:

[0041] The machine tool base 1 is vertically positioned and installed on the workbench of the gear hobbing machine 6, and the machine tool base 1 is a stepped cylindrical component; the base core shaft 2 includes a first core shaft segment 21, a second core shaft segment 22 and a third core shaft segment 23 which are coaxially connected in sequence, the first core shaft segment 21 is centrally positioned and installed on the workbench of the gear hobbing machine 6, and is located at the inner center of the machine tool base 1, a second inner stop 221 is provided at the bottom of the second core shaft segment 22, and the second core shaft segment 22 is positioned and installed on the machine tool base 1 through the second inner stop 221, and the top of the third core shaft segment 23 is suitable for axial insertion into the inner hole of the thin-walled outer gear ring 3, so that the thin-walled outer gear ring 3 is in an inverted suspended state; the locking piece is vertically axially pressed and connected to the third core shaft segment 23 and the thin-walled outer gear ring 3.

[0042] Figure 1The thin-walled external gear hobbing tool shown is composed of a machine base 1, a base mandrel 2 and a locking member. The machine base 1 is a basic component, and the machine base 1 is a stepped cylindrical component and is vertically positioned and installed on the workbench of the gear hobbing machine 6, and is positioned and connected. The base core shaft 2 is composed of a first core shaft segment 21, a second core shaft segment 22 and a third core shaft segment 23. The three shaft segments are coaxially connected in sequence. The first core shaft segment 21 arranged at the bottom is positioned and installed on the workbench of the gear hobbing machine 6 as a supporting and positioning component, and is coaxial with the center of the machine tool base 1. A second inner stop 221 is provided at the bottom of the second core shaft segment 22. The second core shaft segment 22 is positioned and installed on the machine tool base 1 through the second inner stop 221, thereby ensuring the verticality and stability of the base core shaft 2. The third core shaft segment 23 is a component for supporting and positioning the thin-walled outer gear ring 3. It is directly inserted into the inner hole of the thin-walled outer gear ring 3, and is interference fit with the inner hole, thereby placing the thin-walled outer gear ring 3 in an inverted suspended state; finally, it is vertically axially compressed and connected to the third core shaft segment 23 and the thin-walled outer gear ring 3 through a locking member, thereby avoiding the problem of the outer gear ring being clamped and deformed.

[0043] By adopting the gear hobbing tooling with the above structure, the thin-walled outer gear ring 3 is not subjected to any radial force during the positioning, clamping and gear hobbing processes, which can not only ensure the processing accuracy of the teeth of the thin-walled outer gear ring, but also prevent the thin-walled section from being deformed. The processing quality fully meets the matching requirements, and the deformation of the outer gear ring caused by the tension mechanism is avoided. In addition, the tooling has a long service life, high safety performance, high work efficiency and good precision maintenance.

[0044] Furthermore, the machine tool base 1 includes a first barrel section 11 and a second barrel section 12, and the first barrel section 11 and the second barrel section 12 are coaxially connected in sequence, and a coaxial first internal stop 121 is provided at the bottom of the second barrel section 12; the gear hobbing machine 6 includes a workbench 62 located at the top, and the first internal stop 121 is suitable for positioning and installing on a first shaft shoulder 621 of the workbench 62.

[0045] See also Figure 1 , 2 As shown, in a specific embodiment of the utility model, the machine tool base 1 is composed of a first barrel section 11 and a second barrel section 12 connected together, the first barrel section 11 and the second barrel section 12 are coaxially connected in sequence, and the outer diameter of the first barrel section 11 is smaller than the outer diameter of the second barrel section 12, and a coaxial first inner stop 121 is provided at the bottom of the second barrel section 12, so the inner diameter of the first barrel section 11 is smaller than the inner diameter of the second barrel section 12, and the worktable 62 of the gear hobbing machine 6 has a first shaft shoulder 621 matching the first inner stop 121, so the machine tool base 1 can be positioned and installed on the worktable 62 of the gear hobbing machine 6.

[0046] See also Figure 5As shown, specifically, the depth of the first inner stop 121 is equal to that of the first shaft shoulder 621. The advantage of such a configuration is that the machine tool base 1 can be limited in both radial and axial directions.

[0047] Furthermore, the outer diameters of the top ends of the second barrel section 12 and the workbench 62 are equal, and the second barrel section 12 and the workbench 62 are fixedly connected via a fourth locking member 9 .

[0048] For more details, see Figure 2 , 3 As shown in Figures 5 and 6, in the specific embodiment of the utility model, the outer diameters of the top ends of the second barrel section 12 and the workbench 62 are equal, so that the assembly is more stable and reliable, and the second barrel section 12 is fixedly connected to the workbench 62 by the fourth locking member 9. In this embodiment, a vertically penetrating first bolt hole 122 is provided on the second barrel section 12, and correspondingly, a screw hole is also provided on the workbench 62 opposite to the first bolt hole 122, so the fourth locking member 9 is selected as a hexagon socket screw, which is threadedly connected in the first bolt hole 122 to achieve the connection between the second barrel section 12 and the workbench 62.

[0049] Furthermore, the inner diameter of the first barrel segment 11 is equal to the outer diameter of the second inner stop 221 , the outer diameter of the first barrel segment 11 is equal to the outer diameter of the second core shaft segment 22 , and the first barrel segment 11 and the second core shaft segment 22 are fixedly connected by a first locking member 5 .

[0050] See also Figure 2 , 3 As shown, in a specific embodiment of the present utility model, the first barrel section 11 is assembled and connected with the second core shaft section 22 , and is fixedly connected via a first locking member 5 .

[0051] Furthermore, the thin-walled outer gear ring 3 includes a coaxially connected tooth root portion 31 and a gear ring portion 32, and the gear ring portion 32 is a thin-walled cylindrical structure. A gear ring 321 is provided on the side of the gear ring portion 32 away from the tooth root portion 31, and the outer diameter of the third core shaft segment 23 is equal to the inner diameter of the gear ring portion 32.

[0052] For details, please refer to Figure 4 As shown, in a specific embodiment of the utility model, the thin-walled outer gear ring 3 is composed of a tooth root portion 31 and a gear ring portion 32, the tooth root portion 31 is coaxially connected with the gear ring portion 32, and a gear ring 321 is provided on the side of the gear ring portion 32 away from the tooth root portion 31. Since the gear ring portion 32 is a thin-walled cylindrical structure, in order to realize the gear hobbing processing of the gear ring 321, the third core shaft segment 23 is directly inserted into the inner hole of the gear ring portion 32. In order to prevent the gear ring 321 from being deformed during processing, the outer diameter of the third core shaft segment 23 is set to be equal to the inner diameter of the gear ring portion 32.

[0053] In addition, in order to facilitate the assembly and disassembly of the thin-walled outer gear ring 3, a chamfer is provided at the top end of the third core shaft segment 23 to facilitate the removal of the workpiece after installation and processing.

[0054] Furthermore, the locking member is a first hexagon socket screw 4, and a vertically arranged second bolt hole 231 is opened in the center of the third core shaft segment 23 and the tooth root portion 31, and the first hexagon socket screw 4 is suitable for being threadedly connected in the second bolt hole 231 to fix the third core shaft segment 23 and the tooth root portion 31.

[0055] See also Figure 1 As shown, in the specific embodiment of the utility model, as the preferred implementation mode of this embodiment, the locking member is a first hexagon socket screw 4, which is not only convenient to obtain materials and simple to operate, but also can achieve the compression and fixation of the thin-walled outer gear ring 3 by screwing in the first hexagon socket screw 4.

[0056] Furthermore, the first locking member 5 is a hexagon socket screw, and a plurality of evenly distributed vertical through-connecting holes are provided on the second core shaft segment 22, the vertical through-connecting holes include a countersunk hole 222 and a first through hole 223 that are coaxially connected in sequence, and a coaxial vertical first screw hole 111 is provided on the first barrel segment 11 opposite the vertical through-connecting hole, the hexagon socket screw is suitable for being inserted into the through-connecting hole and the first screw hole 111, and when the nut of the first screw hole 111 abuts against the countersunk hole 222, the second core shaft segment 22 is fixedly connected to the first barrel segment 11.

[0057] See also Figure 1 As shown, further, by setting the first locking member 5, the fixed connection between the machine tool base 1 and the base spindle 2 can be achieved. The first locking member 5 is optimized to be set as a hexagon socket screw, so that the fixed connection through the hexagon socket screw not only facilitates the fixation of the base spindle 2, but also fixes it firmly.

[0058] Furthermore, in the specific scheme of the utility model, the gear hobbing machine 6 also includes a first base 61 connected to the workbench 62, the first base 61 and the workbench 62 are fixedly connected by a second locking member 7, and the bottom of the first base 61 is fixedly connected to the ground by a third locking member 8.

[0059] Preferably, the diameter of the first mandrel segment 21 is smaller than the diameter of the third mandrel segment 23, and the diameter of the third mandrel segment 23 is smaller than the diameter of the second mandrel segment 22. This improves the positioning accuracy and installation stability of the thin-walled outer gear ring 3.

[0060] Specific working process:

[0061] The upper end of the base core shaft 2 is finely processed by external cylindrical grinding and other processes to cooperate with the inner hole of the thin-walled outer gear ring 3. The base core shaft 2 and the thin-walled outer gear ring 3 are pressed together by a locking piece. A boss is provided at the upper end of the base core shaft 2 to ensure the consistency of the end face of the thin-walled outer gear ring 3.

[0062] Then install the base mandrel 2 onto the workbench of the gear hobbing machine 6, fix it with the fourth locking piece 9, use a dial indicator to detect the runout, and correct the tooth position runout to within 0.003 mm.

[0063] After the slotting and hobbing process is completed, the completed thin-walled outer gear ring 3 is axially withdrawn, and then replaced with the thin-walled outer gear ring 3 to be processed, and continuous processing is achieved according to the above steps.

[0064] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A thin-walled external gear hobbing tool, used to realize the clamping and positioning of a thin-walled external gear ring (3), characterized in that: include: A machine tool base (1) is installed vertically and positioned on a workbench of a gear hobbing machine (6), and the machine tool base (1) is a stepped cylindrical component; A base spindle (2), comprising a first spindle segment (21), a second spindle segment (22) and a third spindle segment (23) which are coaxially connected in sequence, wherein the first spindle segment (21) is centrally positioned and installed on the workbench of the gear hobbing machine (6) and is located at the inner center of the machine tool base (1), a second inner stop (221) is provided at the bottom of the second spindle segment (22), and the second spindle segment (22) is positioned and installed on the machine tool base (1) through the second inner stop (221), and the top of the third spindle segment (23) is suitable for axial insertion into the inner hole of the thin-walled outer gear ring (3) so that the thin-walled outer gear ring (3) is in an inverted suspended state; The locking piece is vertically and axially pressed and connected to the third core shaft segment (23) and the thin-walled outer gear ring (3).

2. The thin-walled external gear hobbing tool as claimed in claim 1, characterized in that: The machine tool base (1) comprises a first barrel section (11) and a second barrel section (12) which are coaxially connected in sequence, and a coaxial first inner stop (121) is provided at the bottom of the second barrel section (12); The gear hobbing machine (6) comprises a workbench (62) located at the top, and the first inner stop (121) is suitable for being positioned and installed on a first shaft shoulder (621) of the workbench (62).

3. The thin-walled external gear hobbing tool as claimed in claim 2, characterized in that: The first inner stop (121) and the first shaft shoulder (621) have the same depth.

4. The thin-walled external gear hobbing tool as claimed in claim 3, characterized in that: The outer diameters of the second barrel section (12) and the top end of the workbench (62) are equal, and the second barrel section (12) and the workbench (62) are fixedly connected via a fourth locking member (9).

5. The thin-walled external gear hobbing tool as claimed in any one of claims 2 to 4, characterized in that: The inner diameter of the first barrel section (11) is equal to the outer diameter of the second inner stop (221), the outer diameter of the first barrel section (11) is equal to the outer diameter of the second core shaft section (22), and the first barrel section (11) and the second core shaft section (22) are fixedly connected via a first locking member (5).

6. The thin-walled external gear hobbing tool as claimed in claim 5, characterized in that: The thin-walled outer gear ring (3) comprises a coaxially connected tooth root portion (31) and a gear ring portion (32), and the gear ring portion (32) is a thin-walled cylindrical structure. A gear ring (321) is provided on the side of the gear ring portion (32) away from the tooth root portion (31), and the outer diameter of the third core shaft segment (23) is equal to the inner diameter of the gear ring portion (32).

7. The thin-walled external gear hobbing tool as claimed in claim 6, characterized in that: The locking member is a first hexagon socket screw (4), and a vertically arranged bolt hole is opened in the center of the third core shaft segment (23) and the tooth root portion (31), and the first hexagon socket screw (4) is suitable for being threadedly connected in the bolt hole to fix the third core shaft segment (23) and the tooth root portion (31).

8. The thin-walled external gear hobbing tool as claimed in claim 5, characterized in that: The first locking member (5) is a hexagon socket screw, and the second core shaft section (22) is provided with a plurality of evenly distributed vertical through-connecting holes, the vertical through-connecting holes comprising a countersunk hole (222) and a first through hole (223) coaxially connected in sequence, the first barrel section (11) is provided with a coaxial vertical first screw hole (111) directly opposite the vertical through-connecting hole, the hexagon socket screw is suitable for being inserted into the through-connecting hole and the first screw hole (111), and when the nut of the first screw hole (111) abuts against the countersunk hole (222), the second core shaft section (22) is fixedly connected to the first barrel section (11).

9. The thin-walled external gear hobbing tool as claimed in claim 2, characterized in that: The gear hobbing machine (6) further comprises a first base (61) connected to the workbench (62); the first base (61) and the workbench (62) are fixedly connected via a second locking member (7); and the bottom of the first base (61) is fixedly connected to the ground via a third locking member (8).

10. The thin-walled external gear hobbing tool as claimed in claim 9, characterized in that: The diameter of the first mandrel segment (21) is smaller than the diameter of the third mandrel segment (23), and the diameter of the third mandrel segment (23) is smaller than the diameter of the second mandrel segment (22).

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