Clamping jaw and chuck device for hob machining gear shaft

Abstract

The invention discloses a clamping jaw for hob machining of a gear shaft. The clamping jaw comprises a sliding block. Profiling teeth are fixedly arranged on the upper surface of one end of the sliding block. One end of the profiling tooth is a cambered surface part, and the cambered surface part corresponds to the circumferential side of an optical axis on one side of a machined gear shaft, so that the cambered surface part can be attached to the outer side of the optical axis; the other end, away from the cambered surface portion, of the profiling tooth is provided with a tooth-shaped portion, the tooth-shaped portion corresponds to the tooth shape of a gear portion in the middle of a machined gear shaft, and the tooth-shaped portion is used for avoiding interference between the profiling tooth and a hob when the hob is used for machining the gear portion. Through the arrangement of the profiling teeth, on one hand, the profiling teeth of the clamping jaws have enough thickness, the structural bearing capacity is large, and the clamping optical axis is firm enough; on the other hand, the tooth shape of the clamping jaw corresponds to the gear shaft, cutting by a hob can be avoided, interference between the clamping jaw and the hob is avoided, the optical axis does not need to be prolonged, the subsequent optical axis cutting step is avoided, materials are saved, cost is reduced, and efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical processing, and in particular relates to a clamping claw and a chuck device used for hobbing a gear shaft. Background Art

[0002] The gear shaft is a shaft part with a gear in the middle and smooth shafts at both ends. At present, the usual method of hobbing the gear shaft is to use a standard chuck to clamp the smooth shaft end of the gear shaft without teeth, and then perform hobbing. However, for parts with shorter smooth shafts, the smooth shaft must be lengthened to avoid interference between the hob and the standard claws, and the excess part is removed after the tooth shape is processed. This processing method increases the production cycle of the gear shaft, wastes the material of the gear shaft, is costly, and has low efficiency. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the existing defects and provide a clamping claw and chuck device for hobbing gear shafts. The primary purpose is to clamp the optical axis of the gear shaft reliably enough to avoid shaking of the gear shaft during processing and ensure processing accuracy. On this basis, the processing is performed in one go, and the optical axis does not need to be lengthened to avoid cutting, thereby improving the efficiency of processing the gear shaft and reducing processing costs.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a clamping claw for hobbing a gear shaft, comprising a slider; a profiling tooth is fixedly arranged on the upper surface of one end of the slider; one end of the profiling tooth is an arc surface portion, the arc surface portion corresponds to the circumferential side of the optical axis on one side of the gear shaft to be processed, and the arc surface portion can be fitted on the outer side of the optical axis; the other end of the profiling tooth away from the arc surface portion is set as a tooth-shaped portion, the tooth-shaped portion corresponds to the tooth shape of the gear portion in the middle of the gear shaft to be processed, and is used to avoid interference between the profiling tooth and the hob when the gear portion is processed by the hob.

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

[0006] The present invention also provides a chuck for hobbing gear shafts, comprising a plurality of jaws as described in the claim; the plurality of jaws are radially distributed with the center of the chuck as a reference center, and can be radially slidably installed on the chuck; each of the arc surface portions is arranged close to the center, and is used to clamp the optical axis through the arc surface portion when the plurality of jaws approach the center; each of the tooth-shaped portions corresponds to one of the tooth shapes of the gear portion.

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

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

[0009] As a further optimization, the outer contour of the chuck corresponds to a standard chuck on a 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: through the setting of the profiling teeth, on the one hand, the profiling teeth of the clamping jaws have sufficient thickness, large structural bearing capacity, and can clamp the optical axis firmly enough; on the other hand, the tooth shape of the clamping jaws corresponds to the gear shaft, which can avoid being cut by the hob and avoid interference between the clamping jaws and the hob, so that there is no need to extend the optical axis, thereby avoiding the subsequent step of cutting the optical axis, saving materials, reducing costs, and improving efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0012] Figure 2 It is a schematic diagram of the three-dimensional structure of an embodiment of the present invention;

[0013] Figure 3 It is a schematic diagram of the three-dimensional structure of the clamping claw in an embodiment of the present invention.

[0014] The correspondence between the technical features and the reference numerals in the figure is: top 1; gear shaft 2; claw 3; slider 31; contoured tooth 32; arc portion 33; toothed portion 34; chuck 4; standard claw 5; T-shaped bolt 6; shoulder nut 7; pressure plate 8; standard chuck 9; workbench 10. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0016] See also Figure 1-3 The present invention provides a technical solution: a device for machining a gear shaft with an involute toothed jaw and a method for using the device, the device comprising a center 1, a gear shaft 2 to be machined, an involute toothed jaw 3, a chuck 4, a standard jaw 5, a T-bolt 6, a shoulder nut 7, a pressure plate 8, a standard chuck 9 and a workbench 10; the standard chuck 9 is fixed to the workbench 10 by the T-bolt 6, the shoulder nut 7 and the pressure plate 8, and coincides with the rotation center of the workbench 10. The chuck 4 is fixed by the standard jaw 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 jaw 3, and cooperates with the center 1 to perform tooth machining on the gear shaft 2 to be machined.

[0017] Among them, the clamping claw 3 includes a slider 31; a profiling tooth 32 is fixedly arranged on the upper surface of one end of the slider 31; one end of the profiling tooth 32 is an arc surface 33, and the arc surface 33 corresponds to the circumferential side of the optical axis on one side of the gear shaft 2 being processed, so that the arc surface 33 can be attached to the outer side of the optical axis; the other end of the profiling tooth 32 away from the arc surface 33 is set as a tooth-shaped portion 34, and the tooth-shaped portion 34 corresponds to the tooth shape of the gear part in the middle of the gear shaft 2 being processed, so as to avoid interference between the profiling tooth 32 and the hob when the hob is processing the gear part.

[0018] The chuck used for hobbing gear shaft includes multiple claws 3 as described above; multiple claws 3 are radially distributed with the center of the chuck 4 as the reference center, and can be radially slidably installed on the chuck 4; each arc surface 33 is arranged close to the center, and is used to clamp the optical axis through the arc surface 33 when the multiple claws 3 move toward the center; each tooth-shaped portion 34 corresponds to one of the tooth shapes of the gear portion.

[0019] Exemplarily, the number of the clamping claws 3 is three, and the angle between two adjacent clamping claws 3 is 120 degrees.

[0020] It should be noted that the connection and cooperation between the claw 3 and the chuck 4 is a prior art, and the center 1 is a component of the machine tool, which is also a prior art. The chuck 4 is installed on the standard chuck 9 for easy replacement. By replacing different chucks 4, the processing of gear shafts of different sizes can be completed, and the loading and unloading is convenient and efficient. The setting of the T-bolt 6, the shoulder nut 7, and the pressure plate 8 is for installation on the rotatable workbench 10 on the machine tool, and does not prevent the standard chuck 9 from being detachable, ensuring the processing adaptability of the machine tool.

[0021] The method of use can be as follows.

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

[0023] S2: Adjust the center of the standard chuck 9 and the center of the workbench 10 to coincide with each other;

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

[0025] S4: Fixing the chuck 4 to the standard chuck 9 by means of the standard jaws 5 of the standard chuck 9;

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

[0027] S6: Positioning and pressing the gear shaft 2 to be processed by the chuck 4 and the involute toothed jaws 3;

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

[0029] S8: Processing the gear shaft 2 to be processed;

[0030] S9: After the processing of the gear shaft 2 is completed, loosen the center 1 and the involute toothed claw 3, and remove the gear shaft 2.

[0031] Among them, the tool setting step of step S5 is only required for the first gear shaft 2. When the gear shaft 2 to be processed is subsequently installed, the contour teeth 32 play a role in positioning.

[0032] It can be seen that the present invention can also be applied to other tooth shapes, and the involute tooth shape is only an example. Through the setting of the profiling tooth 32, on the one hand, the profiling tooth 32 of the clamping jaw 3 has a sufficient thickness, a large structural bearing capacity, and a sufficiently firm clamping optical axis; on the other hand, the tooth shape of the clamping jaw 3 corresponds to the gear shaft 2, which can avoid being cut by the hob and avoid interference between the clamping jaw 3 and the hob, so that there is no need to extend the optical axis, thereby avoiding the subsequent step of cutting the optical axis, saving materials, reducing costs, and improving efficiency.

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

Claims

1. A claw for hobbing a gear shaft, comprising a slider (31); characterized in that: A profiling tooth (32) is fixedly arranged on the upper surface of one end of the slider (31); one end of the profiling tooth (32) is an arcuate portion (33), and the arcuate portion (33) corresponds to the circumferential side of the optical axis on one side of the processed gear shaft (2), so that the arcuate portion (33) can be attached to the outer side of the optical axis; The other end of the profiling tooth (32) away from the arc surface (33) is set as a tooth-shaped portion (34), and the tooth-shaped portion (34) corresponds to the tooth shape of the gear portion in the middle of the gear shaft (2) to be processed, and is used to avoid interference between the profiling tooth (32) and the hob when the gear portion is processed by the hob.

2. The claw for hobbing a gear shaft according to claim 1, characterized in that: The gear portion is an involute gear.

3. A chuck for hobbing a gear shaft, characterized in that: It comprises a plurality of claws (3) as claimed in claim 1; the plurality of claws (3) are radially distributed with the center of the chuck (4) as the reference center, and can be radially slidably installed on the chuck (4); each of the arc surface parts (33) is arranged close to the center, and is used for clamping the optical axis through the arc surface part (33) when the plurality of claws (3) are close to the center; each of the tooth-shaped parts (34) corresponds to one of the tooth shapes of the gear part.

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

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

6. A chuck for hobbing a gear shaft according to claim 3, characterized in that: The outer contour of the chuck (4) corresponds to a standard chuck (9) on a machine tool, so that the chuck (4) can be clamped onto the standard chuck (9).

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