A tool spindle tailstock for a gear hobbing machine and the gear hobbing machine itself.

Abstract

This utility model discloses a tailstock for a gear hobbing machine and a gear hobbing machine, relating to the field of machining equipment technology. The tailstock includes: a tailstock base, which can be mounted on a machine tool machining table; and a positioning shaft, mounted within the tailstock base and rotatable along its own axis, with a positioning conical hole at its upper end. The positioning conical hole accommodates a clamping conical section of the machining cutter shaft, and the positioning conical hole is coaxial with the positioning shaft. When the clamping conical section is clamped within the positioning conical hole, the machining cutter shaft is coaxial with the positioning shaft. This avoids offset of the lower tailstock support point, thereby eliminating the accuracy deviation problem caused by datum variation, significantly improving the gear hobbing machining accuracy, meeting the requirements of high-precision gear machining, without requiring replacement of the main machining equipment, resulting in low equipment cost. The gear hobbing machine includes the aforementioned tailstock.

Description

Technical Field

[0001] This utility model relates to the field of mechanical processing equipment technology, specifically to a tool shaft tailstock for a gear hobbing machine and a gear hobbing machine. Background Technology

[0002] Older CNC gear hobbing machines (such as the YKJ3610) were designed and manufactured too early, resulting in lower technological reserves compared to modern machine tools and lower machining accuracy. Furthermore, if current gear hobbing inspection accuracy requirements are applied to the products processed by these machines, it is easy to find instances of machining accuracy exceeding tolerances. However, these types of machine tools are the main equipment for traditional gear hobbing; replacing them with large quantities of newer machines would significantly increase gear production costs.

[0003] In a CNC gear hobbing machine, the cutter shaft is supported by two points: the upper motor shaft and the lower cutter shaft tailstock. The inventors discovered that the upper motor shaft cannot be disassembled; simply adjusting the machine tool parameters according to the machining process allows for the fixation of this support point. However, the lower cutter shaft tailstock is disassembled for use during hob assembly, thus allowing for movement of the support point. Furthermore, the lower cutter shaft tailstock uses a circular hole bushing to position the lower support point. During clamping, the cutter shaft is inserted into the circular hole, and positioning is achieved using the outer diameter of the cutter shaft and the inner diameter of the circular hole. Since most gear machining requires a precision of 0.01mm, even reducing the positioning clearance to 0.03mm using this positioning method will result in a misalignment of the positioning datum, ultimately leading to machining accuracy deviations. Utility Model Content

[0004] To address the technical problem of positioning reference misalignment in existing gear hobbing machine tool shafts, this invention provides a tool shaft tailstock and gear hobbing machine tool that can prevent the lower tool shaft tailstock support point from shifting, thereby eliminating the accuracy deviation problem caused by reference variation, significantly improving the gear hobbing machining accuracy, meeting the requirements of high-precision gear machining, without the need to replace the main machining equipment, and thus reducing equipment costs.

[0005] This utility model is achieved through the following technical solution:

[0006] In a first aspect, this utility model provides a tailstock bed for a gear hobbing machine, comprising: a tailstock seat, which can be mounted on a machine tool machining table; a positioning shaft, which is mounted in the tailstock seat and can rotate along its own axis, and has a positioning cone hole at its upper end, the positioning cone hole being used to accommodate a clamping cone section of the machining tool shaft, and the positioning cone hole being coaxial with the positioning shaft; wherein, when the clamping cone section is clamped in the positioning cone hole, the machining tool shaft is coaxial with the positioning shaft.

[0007] The tool shaft tailstock for a gear hobbing machine tool provided by this utility model includes a tailstock seat and a positioning shaft. The positioning shaft is installed in the tailstock seat and can rotate along its own axis. At the same time, a positioning cone hole is provided at the upper end of the positioning shaft. The positioning cone hole is coaxial with the positioning shaft. In use, the clamping cone section of the machining tool shaft is inserted into the positioning cone hole so that the machining tool shaft is coaxial with the positioning shaft, ensuring that the machining tool shaft can rotate stably along its own axis during machining. Then, the tailstock seat is fixed on the worktable of the machine tool to fix and support the machining tool shaft.

[0008] Therefore, the tool shaft tailstock for gear hobbing machine tools provided by this utility model can fix and support the machining tool shaft, avoid the offset of the lower tool shaft tailstock support point, thereby eliminating the problem of accuracy deviation caused by the change of reference, greatly improving the accuracy of gear hobbing, meeting the requirements of high-precision gear machining, without the need to replace the main machining equipment, and the equipment cost is low.

[0009] In an optional embodiment of this application, a mounting hole is provided in the middle of the tailstock seat; a bearing assembly is sleeved on the positioning shaft, and the bearing assembly is installed in the mounting hole to ensure that the positioning shaft can rotate stably around its own axis after being installed on the tailstock seat.

[0010] In an optional embodiment of this application, the tailstock seat is provided with an upper end cover and a lower end cover at both ends. The bearing assembly is confined within the mounting hole by the cooperation of the upper end cover and the lower end cover, so as to install the bearing assembly in the tailstock seat.

[0011] In an optional embodiment of this application, the bearing assembly includes a support bearing, which is a needle roller bearing, to ensure that the bearing has sufficient rotational accuracy.

[0012] In an optional embodiment of this application, two support bearings are provided, and the two support bearings are spaced apart along the axial direction of the mounting hole; the bearing assembly further includes an outer bushing and an inner bushing, the outer bushing abutting between the outer rings of the two support bearings, and the inner bushing abutting between the outer rings of the two support bearings, so as to support the positioning shaft through the two support bearings and ensure that the positioning shaft has sufficient rotational accuracy.

[0013] In an optional embodiment of this application, both the upper end cover and the lower end cover are mounted on the tailstock seat by fixing bolts to facilitate the installation of the bearing assembly.

[0014] In an optional embodiment of this application, multiple fixing bolts are provided, and the multiple fixing bolts that are adapted to the upper end cover and the lower end cover are evenly distributed along the circumference of the tailstock seat to ensure the stability of the bearing assembly installation.

[0015] In an optional embodiment of this application, the upper end cover and the lower end cover respectively abut against the outer ring end face of the corresponding support bearing to ensure that the outer ring of the support bearing is relatively fixed to the tailstock seat.

[0016] In an optional embodiment of this application, one end of the positioning shaft is provided with a limiting step and the other end is an external thread structure; the threaded section of the positioning shaft is adapted to a locking nut, and when the locking nut is connected to the positioning shaft, the outer ring end of the support bearing abuts against the inner wall of the corresponding locking nut and the step surface of the limiting step, so that the positioning shaft and the inner cavity of the support bearing are relatively fixed.

[0017] Secondly, this utility model provides a gear hobbing machine tool, including a tailstock for the gear hobbing machine tool and a machining cutter shaft, wherein the clamping tapered section of the machining cutter shaft is clamped in the positioning tapered hole.

[0018] The gear hobbing machine tool provided by this utility model has a clamping cone section of the machining cutter shaft clamped in the positioning cone hole of the cutter shaft tailstock, which can fix and support the machining cutter shaft, avoid the offset of the support point of the lower cutter shaft tailstock, thereby eliminating the problem of accuracy deviation caused by the change of the reference, greatly improving the accuracy of gear hobbing, meeting the needs of high-precision gear machining, without the need to replace the main machining equipment, and the equipment cost is low.

[0019] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0020] 1. The tool shaft tailstock for a gear hobbing machine tool provided by this utility model includes a tailstock seat and a positioning shaft. The positioning shaft is installed in the tailstock seat and can rotate along its own axis. At the same time, a positioning cone hole is provided at the upper end of the positioning shaft. The positioning cone hole is coaxial with the positioning shaft. In use, the clamping cone section of the machining tool shaft is inserted into the positioning cone hole so that the machining tool shaft is coaxial with the positioning shaft. This ensures that the machining tool shaft can rotate stably along its own axis during machining. Then, the tailstock seat is fixed on the worktable of the machine tool to fix and support the machining tool shaft, thereby preventing the tailstock support point of the lower tool shaft from shifting. This eliminates the problem of accuracy deviation caused by the change of reference, greatly improves the machining accuracy of gear hobbing, meets the requirements of high-precision gear machining, and does not require replacement of the main machining equipment, resulting in low equipment cost.

[0021] 2. The tool shaft tailstock for gear hobbing machine tool provided by this utility model has the clamping cone section of the machining tool shaft clamped in the positioning cone hole of the tool shaft tailstock, which can fix and support the machining tool shaft, avoid the offset of the support point of the lower tool shaft tailstock, thereby eliminating the problem of accuracy deviation caused by the change of the reference, greatly improving the machining accuracy of gear hobbing, meeting the requirements of high-precision gear machining, without the need to replace the main machining equipment, and the equipment cost is low. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] In the attached diagram:

[0024] Figure 1 A cross-sectional view of the tool shaft tailstock for a gear hobbing machine provided in an embodiment of this utility model.

[0025] Figure 2 This is a side view of the tailstock of a gear hobbing machine provided in an embodiment of the present invention.

[0026] The attached diagram shows the markings and corresponding component names:

[0027] 1-Tailstock base, 2-Positioning shaft, 3-Machining cutter shaft, 4-Support bearing, 5-Upper end cover, 6-Lower end cover, 7-Outer bushing, 8-Inner bushing, 9-Fixing bolt, 10-Locking nut. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0030] It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0031] In the description of the embodiments of this application, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of this application is usually placed in when in use, or the orientation or positional relationship that is commonly understood by those skilled in the art. It is only for the convenience of describing this application and simplifying the description, and is not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0032] In the description of this application, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] Example 1

[0034] Combination Figure 1 This embodiment provides a tailstock for a gear hobbing machine tool, comprising: a tailstock seat 1, which can be mounted on a machine tool machining table; and a positioning shaft 2, which is mounted in the tailstock seat 1 and can rotate along its own axis, with a positioning cone hole at its upper end, the positioning cone hole being used to accommodate the clamping cone section of the machining tool shaft 3, and the positioning cone hole being coaxial with the positioning shaft 2; wherein, when the clamping cone section is clamped in the positioning cone hole, the machining tool shaft 3 is coaxial with the positioning shaft 2.

[0035] It is understood that the tailstock seat 1 has a mounting hole in the middle; the positioning shaft 2 is fitted with a bearing assembly, which is installed in the mounting hole to ensure that the positioning shaft 2 can rotate stably around its own axis after being installed on the tailstock seat 1.

[0036] Combined again Figure 1 The tailstock 1 has an upper end cover 5 and a lower end cover 6 at both ends. The upper end cover 5 and the lower end cover 6 cooperate to confine the bearing assembly in the mounting hole so as to install the bearing assembly in the tailstock 1.

[0037] Specifically, the bearing assembly includes a support bearing 4, which is a needle roller bearing, to ensure that the bearing has sufficient rotational accuracy.

[0038] In this embodiment, two support bearings 4 are provided, and the two support bearings 4 are spaced apart along the axial direction of the mounting hole; the bearing assembly also includes an outer bushing 7 and an inner bushing 8, the outer bushing 7 abuts between the outer rings of the two support bearings 4, and the inner bushing 8 abuts between the outer rings of the two support bearings 4, so as to support the positioning shaft 2 through the two support bearings 4 and ensure that the positioning shaft 2 has sufficient rotational accuracy.

[0039] It should be understood that both the upper end cover 5 and the lower end cover 6 are mounted on the tailstock seat 1 by fixing bolts 9 to facilitate the installation of the bearing assembly.

[0040] Combination Figure 2 Multiple fixing bolts 9 are provided, and the multiple fixing bolts 9 that are adapted to the upper end cover 5 and the lower end cover 6 are evenly distributed along the circumference of the tailstock seat 1 to ensure the stability of the bearing assembly installation.

[0041] It is known that the upper end cover 5 and the lower end cover 6 respectively abut against the outer ring end face of the support bearing 4 to ensure that the outer ring of the support bearing 4 is relatively fixed to the tailstock seat 1.

[0042] Based on this, one end of the positioning shaft 2 is provided with a limiting step (stepped shaft shape), and the other end is an external thread structure; the threaded section of the positioning shaft 2 is adapted to a locking nut 10. When the locking nut 10 is connected to the positioning shaft 2, the outer ring end of the support bearing 4 abuts against the inner wall of the corresponding locking nut 10 and the step surface of the limiting step, so that the positioning shaft 2 and the inner cavity of the support bearing 4 are relatively fixed.

[0043] Generally, the gap between the side of the positioning hole and the outer wall of the outer bushing 7 should be less than 0.01 mm, and the gap between the inner wall of the inner bushing 8 and the outer wall of the small-diameter section of the positioning shaft 2 should also be less than 0.01 mm to ensure the rotational accuracy of the positioning shaft 2. At the same time, the difference between the taper of the positioning cone hole of the positioning shaft 2 and the taper of the clamping cone section of the machining tool shaft 3 should be less than 0.01° to ensure that the coaxiality between the machining tool shaft 3 and the positioning shaft 2 is within the set range.

[0044] The tailstock for a gear hobbing machine provided in this embodiment is used by placing the upper support bearing 4 into the mounting hole of the tailstock seat 1, then connecting the upper end cover 5 to the tailstock seat 1 with fixing bolts 9. At the same time, the inner bushing 8 is placed into the hole of the outer bushing 7, the outer bushing 7 is placed into the mounting hole of the tailstock seat 1, and the lower support bearing 4 is placed into the mounting hole of the tailstock seat 1. Then, the positioning shaft 2 is placed into the inner hole of the inner bushing 8, and the tail end thread of the positioning shaft 2 is locked with a locking nut 10. Finally, the lower end cover 6 is connected to the tailstock seat 1 with fixing bolts 9.

[0045] During machining, first, the tailstock of the tool shaft is installed into the T-groove of the tool shaft of the corresponding model of gear hobbing machine (such as YKJ3610). Then, the machining tool shaft 3 is installed into the positioning tapered hole of the custom shaft. Then, it is pushed upward to make the positioning tapered hole and the clamping tapered section of the machining tool shaft 3 fit tightly, so that the machining tool shaft 3 is coaxial with the positioning shaft 2. This ensures that the machining tool shaft 3 can rotate stably along its own axis during machining. Finally, the tailstock of the tool shaft is locked to complete the tool assembly, thereby fixing and supporting the machining tool shaft 3, ready for machining.

[0046] In summary, the tailstock for the gear hobbing machine tool provided in this embodiment can fix and support the machining tailstock 3, avoid the offset of the lower tailstock support point, thereby eliminating the problem of accuracy deviation caused by the change of reference, greatly improving the gear hobbing machining accuracy, meeting the requirements of high-precision gear machining, without the need to replace the main machining equipment, and the equipment cost is low.

[0047] Example 2

[0048] Combination Figure 1 This embodiment provides a gear hobbing machine tool, including a tailstock and a machining cutter 3. The clamping tapered section of the machining cutter 3 is clamped in the positioning tapered hole, thereby fixing and supporting the machining cutter 3, preventing the support point of the tailstock from shifting, thus eliminating the problem of accuracy deviation caused by the change of reference, greatly improving the gear hobbing accuracy, meeting the requirements of high-precision gear machining, without the need to replace the main machining equipment, and with low equipment cost.

[0049] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A tool spindle tailstock for a gear hobbing machine, characterized in that, include: Tailstock base (1) can be mounted on a machine tool processing table; The positioning shaft (2) is installed in the tailstock seat (1) and can rotate along its own axis. The upper end is provided with a positioning cone hole. The positioning cone hole is used to accommodate the clamping cone section of the machining tool shaft (3). The positioning cone hole is coaxial with the positioning shaft (2). When the clamping cone section is clamped in the positioning cone hole, the machining tool shaft (3) is coaxial with the positioning shaft (2).

2. The tool shaft tailstock for a gear hobbing machine according to claim 1, characterized in that, The tailstock seat (1) has a mounting hole in the middle; The positioning shaft (2) is fitted with a bearing assembly, which is installed in the mounting hole.

3. The tool shaft tailstock for a gear hobbing machine according to claim 2, characterized in that, The tailstock seat (1) has an upper end cover (5) and a lower end cover (6) at both ends. The bearing assembly is confined within the mounting hole by the cooperation of the upper end cover (5) and the lower end cover (6).

4. The tool shaft tailstock for a gear hobbing machine according to claim 3, characterized in that, The bearing assembly includes a support bearing (4), which is a needle roller bearing.

5. The tool shaft tailstock for a gear hobbing machine according to claim 4, characterized in that, Two support bearings (4) are provided, and the two support bearings (4) are spaced apart along the axial direction of the mounting hole; The bearing assembly further includes an outer bushing (7) and an inner bushing (8), the outer bushing (7) abutting between the outer rings of the two support bearings (4), and the inner bushing (8) abutting between the outer rings of the two support bearings (4).

6. The tool shaft tailstock for a gear hobbing machine according to claim 5, characterized in that, The upper end cover (5) and the lower end cover (6) are both installed on the tailstock seat (1) by fixing bolts (9).

7. The tool shaft tailstock for a gear hobbing machine according to claim 6, characterized in that, Multiple fixing bolts (9) are provided, and the multiple fixing bolts (9) that are adapted to the upper end cover (5) and the lower end cover (6) are evenly distributed along the circumference of the tailstock seat (1).

8. The tool shaft tailstock for a gear hobbing machine according to claim 4, characterized in that, The upper end cap (5) and the lower end cap (6) respectively abut against the outer ring end face of the support bearing (4).

9. The tool shaft tailstock for a gear hobbing machine according to claim 4, characterized in that, The positioning shaft (2) has a limit step at one end and an external thread structure at the other end; The threaded section of the positioning shaft (2) is fitted with a locking nut (10). When the locking nut (10) is connected to the positioning shaft (2), the outer ring end of the support bearing (4) abuts against the inner wall of the corresponding locking nut (10) and the step surface of the limiting step.

10. A gear hobbing machine tool, characterized in that, Includes the tailstock and machining cutter shaft (3) for a gear hobbing machine tool as described in any one of claims 1 to 9, wherein the clamping tapered section of the machining cutter shaft (3) is clamped in the positioning tapered hole.

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