Flexible gear hobbing tool

Abstract

The utility model discloses a flexible gear hobbing tool and relates to the technical field of flexible gear machining, the flexible gear hobbing tool comprises a base, a positioning mandrel and a pressing plate, the base is fixedly connected to a workbench of a gear hobbing machine, and the top of the base is provided with a first outer spigot; the positioning mandrel is inserted into an inner hole of the thin-wall flexible gear, a first inner spigot is formed in the bottom of the positioning mandrel, and the first inner spigot of the positioning mandrel is suitable for being inserted into the first outer spigot of the base; the pressing plate abuts against the top of the thin-wall flexible gear, and the pressing plate and the thin-wall flexible gear are fixedly connected through a first locking piece. The thin-wall flexible gear is supported to be round in a mechanical expansion mode and rotates along with the positioning mandrel, turning or rotating detection of thin-wall parts is facilitated, and therefore hobbing precision, production efficiency and the service life of a cutter are prevented from being affected.

Description

Technical Field

[0001] The utility model relates to the technical field of flexible wheel processing, in particular to a flexible wheel gear hobbing tool. Background Art

[0002] Large diameter and small modulus flexible gears usually refer to the gears in the harmonic reducer that mesh with the rigid wheel to transmit motion. When the flexible gear is processed, clamped and positioned, the inner hole of the flexible gear is generally used as the positioning surface and the end surface is used as the supporting surface.

[0003] In the prior art, a commonly used flexible wheel gear hobbing fixture is generally used, usually a spring jacket. The spring jacket is tightened by using a tension mechanism to tighten the inner hole of the flexible wheel. However, due to the small wall thickness of the flexible wheel, the tension mechanism can easily deform the flexible wheel when providing tension, affecting the gear hobbing accuracy, production efficiency, and even the service life of the tool. Utility Model Content

[0004] The main purpose of the utility model is to provide a flexible wheel gear hobbing tooling, aiming to solve the technical problem that the existing gear hobbing tooling is easy to cause the flexible wheel support to deform when processing and testing the thin-walled flexible wheel, affecting the gear hobbing accuracy, production efficiency and even the service life of the tool.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a flexible gear hobbing tool, comprising:

[0006] A base is fixedly connected to the workbench of the gear hobbing machine, and a first outer stop is provided on the top of the base;

[0007] A positioning mandrel is inserted into the inner hole of the thin-walled flexible wheel, and a first inner stop is provided at the bottom of the positioning mandrel, and the first inner stop of the positioning mandrel is suitable for being inserted into the first outer stop of the base;

[0008] A pressure plate is pressed on the top of the thin-walled flexible wheel, and the pressure plate and the thin-walled flexible wheel are fixedly connected through a first locking member.

[0009] Optionally, a discharge ring is further included, and the discharge ring is sleeved on the bottom end surfaces of the positioning mandrel and the thin-walled flexible wheel.

[0010] Optionally, it further comprises a second locking member fixedly connected between the positioning spindle and the base, and a plurality of the second locking members are evenly distributed on the positioning spindle along the central axis.

[0011] Optionally, a second outer stop is provided at the bottom center of the pressure plate, and a base is provided at the top center of the thin-walled flexible wheel, and the base is suitable for being sleeved on the second outer stop of the pressure plate.

[0012] Optionally, the first locking member is a hexagon socket bolt, and the second locking member is a hexagon socket bolt.

[0013] Optionally, a fourth connecting hole vertically passing through the central axis of the pressure plate is provided, a second connecting hole opposite to the fourth connecting hole is provided on the top of the positioning core shaft, and the first locking piece is suitable for being threadedly connected in the fourth connecting hole and the second connecting hole.

[0014] Optionally, the positioning core shaft is provided with a plurality of first connecting holes evenly distributed around the central axis, and the first connecting hole includes a first countersunk hole and a first screw hole connected in sequence, and the first screw hole extends to a certain depth on the base, and the second locking piece is suitable for being threadedly connected in the first countersunk hole and the first screw hole.

[0015] Optionally, the base is provided with a plurality of third connecting holes evenly distributed and vertically penetrating around the central axis, the third connecting hole comprises a second countersunk hole and a second screw hole coaxially connected in sequence, and the second screw hole extends downward to the workbench of the gear hobbing machine.

[0016] Optionally, a third locking member is threadedly connected to the third connecting hole, and the third locking member is a hexagon socket bolt, and the hexagon socket bolt is suitable for being connected to the second countersunk hole and the second screw hole.

[0017] Optionally, the outer diameter of the positioning mandrel is 119-121 mm.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] In the technical scheme of the utility model, the flexible wheel gear hobbing tool consists of a positioning mandrel, a base and a pressure plate. The base is similar to a flange structure and is fixedly connected to the workbench of the gear hobbing machine. By setting a first outer stop on the top of the base and a first inner stop on the bottom of the positioning mandrel, the first outer stop and the first inner stop cooperate with each other, so that the positioning mandrel can be positioned on the base, and the positioning mandrel is a cylindrical structure, which is suitable for being inserted into the inner hole of the thin-walled flexible wheel, so that the thin-walled flexible wheel is supported by the supporting and tightening effect of the positioning mandrel, and the thin-walled flexible wheel expands and deforms with the positioning mandrel, so that the thin-walled flexible wheel can be used for machining or testing; the upper end of the thin-walled flexible wheel presses the upper end face of the thin-walled flexible wheel through the pressure plate, and is locked by the first locking piece to play an axial positioning role. The flexible wheel gear hobbing tool in this embodiment has a simple structure, is easy to make, has a low production cost, is easy to install, can well control the deformation of the thin-walled flexible wheel with a large diameter and a small modulus when performing gear hobbing, thereby improving the gear hobbing accuracy, and further improving the production efficiency, and even avoiding affecting the service life of the tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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.

[0021] Figure 1 A schematic diagram of the internal structure of a flexible gear hobbing tool provided in an embodiment of the utility model.

[0022] Description of Figure Numbers:

[0023] 1-positioning mandrel; 11-first inner stop; 12-first connecting hole; 121-first countersunk hole; 122-first screw hole; 13-second connecting hole;

[0024] 2-base; 21-first outer stop; 22-second inner stop; 23-third connecting hole; 231-second countersunk hole; 232-second screw hole;

[0025] 3-pressing plate; 31-second outer stop; 32-fourth connecting hole;

[0026] 4-discharging ring;

[0027] 5-thin-walled flexible wheel; 51-flange end; 52-thin-walled cylinder; 53-base; 531-first positioning hole;

[0028] 6-first locking piece; 7-second locking piece; 8-third locking piece. DETAILED DESCRIPTION

[0029] 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.

[0030] 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.

[0031] 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.

[0032] See also Figure 1 As shown, the utility model provides a flexible gear hobbing tool, which includes a positioning mandrel 1, a base 2 and a pressing plate 3, wherein:

[0033] The base 2 is fixedly connected to the workbench of the gear hobbing machine, and a first outer stop 21 is provided on the top of the base 2; the positioning mandrel 1 is inserted into the inner hole of the thin-walled flexible wheel 5, and a first inner stop 11 is opened at the bottom of the positioning mandrel 1, and the first inner stop 11 of the positioning mandrel 1 is suitable for being inserted on the first outer stop 21 of the base 2; the pressure plate 3 is pressed on the top of the thin-walled flexible wheel 5, and the pressure plate 3 and the thin-walled flexible wheel 5 are fixedly connected by a first locking piece 6.

[0034] In the technical solution of the utility model, the base 2 is similar to a flange structure, which is fixedly connected to the workbench of the gear hobbing machine. By arranging a first outer stop 21 on the top of the base 2 and a first inner stop 11 on the bottom of the positioning core shaft 1, the positioning core shaft 1 can be positioned on the base 2 through the mutual cooperation of the first outer stop 21 and the first inner stop 11. The positioning core shaft 1 is a cylindrical structure, which is suitable for being inserted into the inner hole of the thin-walled flexible wheel 5, so that the thin-walled flexible wheel 5 is supported by the supporting and tightening effect of the positioning core shaft 1, and the thin-walled flexible wheel 5 expands and deforms with the positioning core shaft 1, so that the thin-walled flexible wheel 5 can be used for machining or testing; the upper end of the thin-walled flexible wheel 5 presses the upper end surface of the thin-walled flexible wheel 5 through the pressure plate 3, and is locked by the first locking piece 6 to play an axial positioning role.

[0035] The flexible wheel gear hobbing tooling in this embodiment has a simple structure, is easy to manufacture, has a low production cost, is easy to install, and can well control the deformation of the thin-walled flexible wheel 5 with a large diameter and a small modulus during gear hobbing, thereby improving the gear hobbing accuracy.

[0036] Furthermore, the flexspline gear hobbing tooling further comprises a discharge ring 4 , which is sleeved on the bottom end surface of the positioning mandrel 1 and the thin-walled flexspline 5 .

[0037] Therefore, please refer to Figure 1As shown, in the specific embodiment of the utility model, a discharge ring 4 is provided at the outer bottom of the positioning mandrel 1. When discharging, the discharge ring 4 only needs to be lifted up, so that the vertical upward force can be evenly transmitted to the thin-walled flexible wheel 5, so that the thin-walled flexible wheel 5 can be easily removed. The tooling structure is simple, easy to manufacture, low cost, and the processed thin-walled flexible wheel 5 has extremely high precision.

[0038] In addition, the unloading ring 4 adopts a double-bevel air avoidance design and is matched with the clearance between the positioning core shaft 1 to ensure that the gear hobbing cutter can smoothly roll the entire tooth width without interference. At the same time, the unloading ring 4 is well stressed during unloading to ensure easy disassembly.

[0039] Furthermore, the flexspline gear hobbing tool further comprises a second locking member 7 fixedly connected between the positioning mandrel 1 and the base 2 , and a plurality of second locking members 7 are evenly distributed on the positioning mandrel 1 along the central axis.

[0040] See also Figure 1 As shown, in the specific embodiment of the utility model, the base 2 is positioned by the first outer stop 21 and the first inner stop 11 of the positioning core shaft 1. In order to further ensure the fixation between the positioning core shaft 1 and the base 2, a second locking member 7 is used to lock the connection to avoid processing displacement, which will affect the rolling accuracy of the thin-walled flexible wheel 5.

[0041] Furthermore, a second outer stop 31 is provided at the bottom center of the pressing plate 3 , and a base 53 is provided at the top center of the thin-walled flexible wheel 5 . The base 53 is suitable for being sleeved on the second outer stop 31 of the pressing plate 3 .

[0042] For more details, see Figure 1 As shown, in a specific embodiment of the utility model, the thin-walled flexible wheel 5 is composed of a flange end 51, a thin-walled cylinder 52 and a base 53, wherein the base 53 is coaxially arranged at the top of the thin-walled cylinder 52, and the flange end 51 is coaxially arranged at the bottom of the thin-walled cylinder 52. As the best preferred embodiment, the flange end 51, the thin-walled cylinder 52 and the base 53 are integrally connected, and a first positioning hole 531 is provided at the center of the base 53, so that the second outer stop 31 of the pressure plate 3 can be inserted into the first positioning hole 531 of the base 53 for positioning.

[0043] In addition, according to the inner hole height of the thin-walled cylinder 52, the height of the positioning mandrel 1 is designed to be slightly lower than the height of the thin-walled cylinder 52 by 0.5 mm, and a guide angle is set at the head of the positioning mandrel 1 to guide the direction when clamping the thin-walled flexible wheel 5 to prevent material jamming, play a positioning role for the thin-walled flexible wheel 5, and facilitate vertical alignment.

[0044] Finally, in this embodiment, the module of the thin-walled flexible wheel 5 is as low as 0.35, and the number of teeth is as high as 392. In order to ensure the hobbing accuracy, the positioning surface roughness of the positioning mandrel 1 is set to 0.8.

[0045] Furthermore, the first locking member 6 is a hexagon socket bolt, and the second locking member 7 is a hexagon socket bolt.

[0046] See also Figure 1 As shown, the first locking member 6 and the second locking member 7 are preferably configured as hexagon socket bolts. By screwing the hexagon socket bolts into the connecting holes, the first locking member 6 can realize the connection between the pressure plate 3 and the positioning spindle 1, and the second locking member 7 can realize the connection between the positioning spindle 1 and the base 2.

[0047] Furthermore, a fourth connecting hole 32 vertically penetrates the central axis of the pressure plate 3, a second connecting hole 13 opposite to the fourth connecting hole 32 is provided on the top of the positioning core shaft 1, and the first locking piece 6 is suitable for being threadedly connected in the fourth connecting hole 32 and the second connecting hole 13.

[0048] See also Figure 1 As shown, the fourth connecting hole 32 and the second connecting hole 13 are coaxially arranged vertically opposite to each other, so that the first locking member 6 can connect the pressing plate 3 with the positioning core shaft 1.

[0049] Furthermore, the positioning core shaft 1 is provided with a plurality of first connecting holes 12 evenly distributed around the central axis, and the first connecting hole 12 includes a first countersunk hole 121 and a first screw hole 122 connected in sequence, and the first screw hole 122 extends to a certain depth on the base 2, and the second locking piece 7 is suitable for being threadedly connected in the first countersunk hole 121 and the first screw hole 122.

[0050] The hexagon socket bolt has a nut and a screw part, so a first countersunk hole 121 and a first screw hole 122 with a certain depth are opened on the positioning core shaft 1. When the screw part is screwed downward into the first screw hole 122, the nut of the hexagon socket bolt gradually abuts against the end surface of the first countersunk hole 121. When the first screw hole 122 is subjected to internal radial compression, it expands and deforms, so that the inner wall of the thin-walled flexible wheel 5 is tightly attached to the positioning core shaft 1, and then uniform expansion and deformation occurs.

[0051] Specifically, the base 2 is provided with a plurality of evenly distributed and vertically penetrating third connection holes 23 around the central axis, the third connection hole 23 comprises a second countersunk hole 231 and a second screw hole 232 coaxially connected in sequence, and the second screw hole 232 extends downward to the workbench of the gear hobbing machine.

[0052] See also Figure 1 As shown, in a specific embodiment of the utility model, the base 2 needs to be fixedly connected to the workbench of the gear hobbing machine. For this purpose, the third connecting holes 23 are evenly arranged in the circumferential direction of the upper end surface of the base 2, and the third connecting holes 23 extend downward to the workbench of the gear hobbing machine to facilitate the fixed connection between the two.

[0053] In addition, it should be noted that in this embodiment, a second inner stop 22 is provided on the side of the base 2 close to the workbench of the gear hobbing machine, and the second inner stop 22 can be conveniently positioned and assembled with the working boss of the gear hobbing machine to further improve the positioning accuracy.

[0054] Furthermore, the third connection hole 23 is internally threadedly connected with a third locking member 8 , and the third locking member 8 is a hexagon socket bolt, which is suitable for being connected to the second countersunk hole 231 and the second screw hole 232 .

[0055] See also Figure 1 As shown, in the specific embodiment of the present utility model, considering that the third locking member 8 is also selected as a hexagon socket bolt, since it is necessary to apply downward pressing pressure through the hexagon socket bolt, the hexagon socket bolt has a nut, and for this purpose, a second countersunk hole 231 is opened on the base 2, and the nut of the hexagon socket bolt is screwed into the bottom of the second countersunk hole 231, and the pressing is in place.

[0056] For details, please refer to Figure 1 As shown, in the specific embodiment of the present utility model, the outer diameter of the positioning mandrel 1 is 119-121 mm.

[0057] In this embodiment, the inner hole diameter of the thin-walled flexible wheel 5 can reach 120 mm, and the corresponding preferred diameter of the positioning mandrel 1 is 119-121 mm, so that the positioning mandrel 1 and the inner hole of the thin-walled flexible wheel 5 are transitionally matched.

[0058] Therefore, the outer diameter of the positioning mandrel 1 and the inner diameter of the thin-walled flexible wheel 5 adopt a js transition fit to ensure that the tooth top circle runout of the thin-walled flexible wheel 5 is less than 0.005mm, the outer circle depth of the positioning mandrel 1 is 0.5mm lower than the inner hole depth of the thin-walled flexible wheel 5, the lower end face of the thin-walled flexible wheel 5 is axially positioned with the upper end face of the discharge ring 4, and the upper end face of the thin-walled flexible wheel 5 is locked with a pressing plate 3 to position the axial movement of the thin-walled flexible wheel 5. The tooling does not require a tension mechanism to tighten, avoiding the occurrence of the thin-walled flexible wheel 5 being clamped and deformed.

[0059] The specific use process of the flexible gear hobbing tool provided in the embodiment of the utility model is as follows:

[0060] The base 2 is mounted on the working table of the gear hobbing machine, and the base 2 is fixed on the working table of the gear hobbing machine by a first locking member 6;

[0061] Then, the first inner stop 11 of the positioning mandrel 1 is placed into the first outer stop 21 of the base 2 and is locked and fixed by the second locking member 7;

[0062] Put the discharge ring 4 on the bottom of the positioning mandrel 1;

[0063] After the workpiece (thin-walled flexible wheel 5) is installed, the pressure plate 3 is locked on the top of the workpiece (thin-walled flexible wheel 5) through the third locking piece 8. The runout of the workpiece (thin-walled flexible wheel 5) is detected using a micrometer. When the tooth position runout of the workpiece (thin-walled flexible wheel 5) is corrected to be within 0.005 mm, the external teeth can be processed.

[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 flexible gear hobbing tool, characterized in that: include: A base is fixedly connected to the workbench of the gear hobbing machine, and a first outer stop is provided on the top of the base; A positioning mandrel is inserted into the inner hole of the thin-walled flexible wheel, and a first inner stop is provided at the bottom of the positioning mandrel, and the first inner stop of the positioning mandrel is suitable for being inserted into the first outer stop of the base; A pressure plate is pressed on the top of the thin-walled flexible wheel, and the pressure plate and the thin-walled flexible wheel are fixedly connected through a first locking member.

2. The flexspline gear hobbing tool as claimed in claim 1, characterized in that: It also includes a discharge ring, which is sleeved on the bottom end surfaces of the positioning mandrel and the thin-walled flexible wheel.

3. The flexspline gear hobbing tool as claimed in claim 1, characterized in that: It also includes a second locking member fixedly connected between the positioning core shaft and the base, and a plurality of the second locking members are evenly distributed on the positioning core shaft along the central axis.

4. The flexspline gear hobbing tool as claimed in any one of claims 1 to 3, characterized in that: A second outer stop is provided at the bottom center of the pressure plate, and a base is provided at the top center of the thin-walled flexible wheel. The base is suitable for being sleeved on the second outer stop of the pressure plate.

5. The flexspline gear hobbing tool as claimed in claim 3, characterized in that: The first locking member is a hexagon socket bolt, and the second locking member is a hexagon socket bolt.

6. The flexspline gear hobbing tool as claimed in claim 4, characterized in that: A fourth connecting hole vertically passing through the central axis of the pressure plate is provided, a second connecting hole directly opposite to the fourth connecting hole is provided on the top of the positioning core shaft, and the first locking member is suitable for being threadedly connected in the fourth connecting hole and the second connecting hole.

7. The flexspline gear hobbing tool as claimed in claim 5, characterized in that: The positioning core shaft is provided with a plurality of first connecting holes evenly distributed around the central axis, and the first connecting hole includes a first countersunk hole and a first screw hole connected in sequence, and the first screw hole extends to a certain depth on the base, and the second locking piece is suitable for being threadedly connected in the first countersunk hole and the first screw hole.

8. The flexspline gear hobbing tool as claimed in claim 7, characterized in that: The base is provided with a plurality of third connecting holes evenly distributed and vertically penetrating around the central axis, the third connecting holes include a second countersunk hole and a second screw hole coaxially connected in sequence, and the second screw hole extends downward to the working table of the gear hobbing machine.

9. The flexspline gear hobbing tool as claimed in claim 8, characterized in that: The third connecting hole is internally threadedly connected with a third locking member, and the third locking member is a hexagon socket bolt, and the hexagon socket bolt is suitable for being connected to the second countersunk hole and the second screw hole.

10. The flexspline gear hobbing tool as claimed in claim 9, characterized in that: The outer diameter of the positioning mandrel is 119-121 mm.

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