A chuck and chucking device for hobbing a gear shaft

Abstract

This invention discloses a chuck for hobbing gear shafts. The chuck includes a slider; a contour tooth is fixed to the upper surface of one end of the slider; one end of the contour tooth is an arc-shaped portion, which corresponds to the circumferential side of the optical axis of the gear shaft being machined, allowing the arc-shaped portion to fit against the outer side of the optical axis; the other end of the contour tooth away from the arc-shaped portion is a toothed portion, which corresponds to the toothed portion of the gear portion in the middle of the gear shaft being machined, preventing interference between the contour tooth and the hob when the gear portion is hobbed. Through the contour tooth design, this invention ensures that, on the one hand, the contour tooth of the chuck has sufficient thickness, resulting in high structural load-bearing capacity and a sufficiently firm grip on the optical axis; on the other hand, the toothed portion of the chuck corresponds to the gear shaft, preventing it from being cut by the hob, thus avoiding interference between the chuck and the hob. This eliminates the need to extend the optical axis, thereby avoiding subsequent optical axis cutting steps, saving materials, reducing costs, and improving efficiency.

Description

Technical Field

[0001] This invention belongs to the field of machining technology, specifically relating to a chuck and chuck device for hobbing gear shafts. Background Technology

[0002] A gear shaft is a shaft-type part with a gear section in the middle and smooth shafts at both ends. Currently, the common method for machining gear shafts using a hob is to clamp one end of the smooth shaft (the toothless part) of the gear shaft in a standard chuck and then perform gear hobbing. However, for parts with short smooth shafts, the shaft must be lengthened to avoid interference between the hob and the standard chuck jaws, and the excess material is removed after gear shaping. This machining method increases the production cycle of gear shafts, wastes material, and is costly and inefficient. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the existing defects and provide a chuck and jaw device for hobbing gear shafts. The primary purpose is to ensure that the optical shaft of the gear shaft is held reliably to avoid the gear shaft from shaking during the machining process and to ensure machining accuracy. On this basis, the gear shaft can be formed in one step without lengthening it, thus avoiding cutting and improving the efficiency of gear shaft machining and reducing machining costs.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a chuck for hobbing a gear shaft, comprising a slider; a contour tooth is fixedly provided on the upper surface of one end of the slider; one end of the contour tooth is an arc-shaped portion, which corresponds to the circumferential side of the optical axis on one side of the gear shaft being machined, so that the arc-shaped portion can fit against the outer side of the optical axis; the other end of the contour tooth away from the arc-shaped portion is provided as a toothed portion, which corresponds to the toothed portion of the gear portion in the middle of the gear shaft being machined, so as to avoid interference between the contour tooth and the hob when the gear portion is hobbed.

[0005] As a further optimization, the gear section is an involute gear.

[0006] The present invention also provides a chuck for hobbing gear shafts, comprising a plurality of jaws; the plurality of jaws are radially distributed with the center of the chuck as a reference center, and each of them can be radially slidably mounted on the chuck; each of the arc-shaped portions is disposed close to the center, and is used to clamp the optical shaft through the arc-shaped portion when the plurality of jaws move toward the center; each of the toothed portions corresponds to one of the toothed portions of the gear portion.

[0007] As a further optimization, the number of grippers is three.

[0008] As a further optimization, the included angle between two adjacent claws is degrees.

[0009] As a further optimization, the outer contour of the chuck corresponds to the standard chuck on the machine tool, so that the chuck can be clamped onto the standard chuck.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows: By setting the contour teeth, the present invention has, on the one hand, sufficient thickness of the contour teeth of the gripper, large structural load-bearing capacity, and sufficient firmness in clamping the optical axis; on the other hand, the tooth shape of the gripper corresponds to the gear shaft, which can avoid being cut by the hob, avoid interference between the gripper and the hob, thus eliminating the need to extend the optical axis, thereby avoiding the subsequent optical axis cutting step, saving materials, reducing costs, and improving efficiency. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the planar structure of an embodiment of the present invention;

[0012] Figure 2 This is a three-dimensional structural diagram of an embodiment of the present invention;

[0013] Figure 3 This is a three-dimensional structural diagram of the chuck in an embodiment of the present invention.

[0014] The correspondence between the technical features in the figure and the reference numerals is as follows: 1. Top; 2. Gear shaft; 3. Jaw; 31. Slider; 32. Contouring tooth; 33. Arc-shaped part; 34. Toothed part; 4. Chuck; 5. Standard jaw; 6. T-bolt; 7. Shoulder nut; 8. Pressure plate; 9. Standard chuck; 10. Worktable. Detailed Implementation

[0015] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0016] Please see Figure 1-3 This invention provides a technical solution: a device and method for machining gear shafts using involute toothed jaws. The device comprises a center 1, a gear shaft 2 to be machined, involute toothed jaws 3, a chuck 4, standard jaws 5, T-bolts 6, shoulder nuts 7, a pressure plate 8, a standard chuck 9, and a worktable 10. The standard chuck 9 is fixed to the worktable 10 by the T-bolts 6, shoulder nuts 7, and pressure plate 8, and coincides with the rotation center of the worktable 10. The chuck 4 is fixed by the standard jaws 5, and coincides with the center of the standard chuck 9. The gear shaft 2 to be machined is positioned and clamped by the chuck 4 and the involute toothed jaws 3, and cooperates with the center 1 to machine the gear shaft 2.

[0017] The chuck 3 includes a slider 31; a contour tooth 32 is fixed on the upper surface of one end of the slider 31; one end of the contour tooth 32 is an arc-shaped portion 33, which corresponds to the circumferential side of the optical axis on one side of the gear shaft 2 being machined, so that the arc-shaped portion 33 can fit against the outside of the optical axis; the other end of the contour tooth 32 away from the arc-shaped portion 33 is a toothed portion 34, which corresponds to the toothed portion of the gear portion in the middle of the gear shaft 2 being machined, so as to avoid interference between the contour tooth 32 and the hob when the gear portion is machined by a hob.

[0018] The chuck for hobbing gear shafts includes multiple jaws 3 as described above; the multiple jaws 3 are radially distributed with the center of the chuck 4 as a reference center, and can all be radially slidably mounted on the chuck 4; each arcuate portion 33 is disposed close to the center, and is used to clamp the optical shaft through the arcuate portion 33 when the multiple jaws 3 move toward the center; each toothed portion 34 corresponds to one of the toothed portions of the gear portion.

[0019] For example, the number of the claws 3 is three. The included angle between two adjacent claws 3 is 120 degrees.

[0020] It should be noted that the connection between the jaw 3 and the chuck 4 is existing technology, and the center 1 is a component integrated into the machine tool, also existing technology. The chuck 4 is installed on the standard chuck 9 for easy replacement. By changing different chucks 4, gear shafts of different sizes can be machined, making installation and removal convenient and efficient. The T-bolt 6, shoulder nut 7, and pressure plate 8 are designed for installation on the rotatable worktable 10 of the machine tool without interfering with the detachability of the standard chuck 9, ensuring the machine tool's machining adaptability.

[0021] The method for using it is as follows:

[0022] S1: First, pre-tighten the standard chuck 9 onto the worktable 10 using the T-bolt 6, shoulder nut 7 and pressure plate 8;

[0023] S2: Align the center of the standard chuck 9 with the center of the worktable 10;

[0024] S3: Tighten the shoulder nut 7 to fix the standard chuck 9 onto the worktable 10;

[0025] S4: The chuck 4 is fixed to the standard chuck 9 by the standard jaws 5 of the standard chuck 9;

[0026] S5: Tool setting is performed using involute toothed jaw 3;

[0027] S6: The gear shaft 2 to be processed is positioned and clamped by the chuck 4 and the involute toothed jaw 3;

[0028] S7: Place the center point 1 on the center of the end of the gear shaft 2 to be processed;

[0029] S8: Machining of the gear shaft 2 to be machined;

[0030] S9: After the gear shaft 2 is machined, loosen the center 1 and the involute tooth chuck 3, and remove the gear shaft 2.

[0031] Of these steps, the tool setting step in S5 is only required for the first gear shaft 2. When installing the gear shaft 2 to be machined later, the contour gear 32 serves a positioning function.

[0032] Therefore, this invention can also be applied to other tooth profiles; the involute tooth profile described is merely an example. By setting the contour teeth 32, on the one hand, the contour teeth 32 of the gripper 3 have sufficient thickness, resulting in high structural load-bearing capacity and a sufficiently firm grip on the optical axis; on the other hand, the tooth profile of the gripper 3 corresponds to the gear shaft 2, preventing it from being cut by the hob and avoiding interference between the gripper 3 and the hob. This eliminates the need to extend the optical axis, thereby avoiding subsequent optical axis cutting steps, saving materials, reducing costs, and improving efficiency.

[0033] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A chuck for hobbing gear shafts, characterized in that: It includes multiple jaws (3) for hobbing gear shafts; each jaw (3) includes a slider (31); a contour tooth (32) is fixed on the upper surface of one end of the slider (31); one end of the contour tooth (32) is an arc-shaped surface (33), which corresponds to the circumferential side of the optical axis on one side of the gear shaft (2) being machined, so that the arc-shaped surface (33) can fit against the outside of the optical axis; The other end of the contour tooth (32) away from the arc surface (33) is provided as a toothed part (34). The toothed part (34) corresponds to the toothed part of the gear part in the middle of the gear shaft (2) being machined. When the gear part is machined by a hob, the contour tooth (32) is prevented from interfering with the hob. Multiple jaws (3) are radially distributed around the center of the chuck (4) and can all be radially slidably mounted on the chuck (4); each arc-shaped portion (33) is located close to the center and is used to clamp the optical axis through the arc-shaped portion (33) when the multiple jaws (3) move toward the center; each toothed portion (34) corresponds to one of the teeth of the gear portion; The outer contour of the chuck (4) corresponds to the standard chuck (9) on the machine tool, so that the chuck (4) can be clamped onto the standard chuck (9).

2. The chuck for hobbing gear shafts according to claim 1, characterized in that: The gear section is an involute gear.

3. A chuck for hobbing gear shafts according to claim 1, characterized in that: The number of the claws (3) is three.

4. A chuck for hobbing gear shafts according to claim 3, characterized in that: The included angle between two adjacent claws (3) is 120 degrees.

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