Hobbing end drive tool with pre-centering and anti-falling functions

Abstract

The utility model relates to a gear hobbing end drive tool with pre-centering and anti-falling functions and provides a gear hobbing end drive tool with pre-centering and anti-falling functions and a using method thereof in order to solve the problems that an existing gear hobbing end drive tool cannot meet the balance of a part to be machined or is complex in structure and large in operation difficulty. The bearing device comprises at least three bearing assemblies which are evenly distributed between the inner side wall of a hobbing end drive tool barrel and a floating tip. Each bearing assembly comprises a second spring connected with the base and a bearing column connected with the other end of the second spring, and the bearing columns can be matched with the second springs to do axial movement under the action of external force. According to the utility model, the to-be-machined part can be kept balanced in the whole machining process, and the upper positioning hole and the lower positioning hole of the to-be-machined part can be centered at the same time, so that the to-be-machined part does not incline or fall off, and the machining operation is facilitated.

Description

Technical Field

[0001] The utility model relates to a press-fitting tool and a use method thereof, in particular to a gear-rolling end-drive tool with pre-centering and anti-dropping functions and a use method thereof. Background Art

[0002] When performing the process of shaft gear hobbing, the operator usually uses the end drive tooling to cooperate with the upper and lower positioning method of the two ends of the shaft gear for processing. When the operator places the part to be processed on the end drive tooling, the part first contacts the floating center of the end drive tooling, and when the tail top is pressed down, the lower end surface of the part contacts the end drive tooth. Therefore, for some parts with special structures to be processed (for example, a part with a slender shaft at one end and a tooth at the other end, usually a sun gear), the existing floating center cannot meet the operator's requirements for aligning the upper and lower positioning holes of the part to be processed and keeping the part balanced and not falling when placing the part to be processed on the end drive tooling.

[0003] Chinese patent CN220028909U discloses a gear hobbing fixture, including a base and an upper center, a movable center is vertically slidably connected to the base, a first spring is arranged on the base to drive the movable center to reset, the movable center is arranged corresponding to the upper center and the tips are vertically collinear, a knife edge seat is arranged on the top wall of the base, the knife edge seat has a cutter head facing upward, the cutter head is used to penetrate into the end face of the gear hobbing workpiece, the gear hobbing workpiece is placed between the base and the upper center, the two ends of the gear hobbing workpiece are respectively abutted against the movable center and the upper center to achieve centering and positioning, and then the upper center is driven downward by the power source on the equipment to make the movable center and the gear hobbing workpiece move downward continuously until the cutter head on the knife edge seat penetrates into the end face of the gear hobbing workpiece to achieve circumferential rotation limitation, at which time the gear hobbing workpiece is well fixed and has good stability, the gear hobbing workpiece will not rotate and deviate during processing, which helps to improve the processing accuracy in the later stage.

[0004] Chinese patent CN115625385A discloses an elastic clamping self-centering gear hobbing fixture structure and its use method, which adopts a machine tool center and a fixture center, utilizes the center hole of the gear shaft, changes the traditional outer circle positioning to the center hole positioning, and quickly fixes the outer circle of the gear shaft through a clamping and fixing module, realizes rapid self-centering installation, avoids alignment before processing, and improves product changeover efficiency and processing quality.

[0005] However, the common disadvantages of the above-mentioned prior arts are: complex structure and great difficulty in operation. Utility Model Content

[0006] The purpose of the utility model is to solve the problem that the existing gear hobbing end drive tooling cannot meet the balance of the parts to be processed, or has a complex structure and is difficult to operate, and to provide a gear hobbing end drive tooling with pre-centering and anti-dropping functions and a use method thereof.

[0007] To achieve the above purpose, the technical solution provided by the utility model is:

[0008] A gear hobbing end drive tool with pre-centering and anti-dropping functions, comprising a base for rotation, a cylinder arranged at the upper end of the base, and a floating top arranged in the cylinder, the upper end of the floating top is conical, and a first spring is arranged at its lower end, and the lower end of the first spring is connected to the base, the floating top, the base and the cylinder are coaxially arranged, and at least three raised strip-shaped end drive teeth are radially evenly arranged on the end surface of the cylinder away from the base; the part to be processed is a shaft gear part, an upper positioning hole is arranged at the center of the end surface of the shaft end, and a lower positioning hole is arranged at the center of the end surface of the tooth end, and the strip-shaped end drive teeth are used to embed into the end surface of the tooth end of the part to be processed during processing and drive the part to be processed to rotate;

[0009] Its special features are:

[0010] It also includes at least three supporting components evenly distributed between the inner wall of the cylinder and the floating top;

[0011] The supporting assembly includes a second spring connected to the base at one end and a supporting column connected to the other end of the second spring, and the supporting column can cooperate with the second spring to perform axial movement under the action of external force;

[0012] The supporting column is used to support the end surface of the tooth end of the part to be processed.

[0013] Furthermore, the number of the supporting components is three.

[0014] Furthermore, the number of the supporting components is six.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. The hobbing end drive tooling with pre-centering and anti-dropping functions provided by the utility model adds at least three supporting components, which can keep the parts to be processed balanced throughout the processing, and can simultaneously center the upper positioning holes and the lower positioning holes of the parts to be processed, so that they will not tilt or fall, which is conducive to the processing operation;

[0017] 2. The gear hobbing end drive tooling with pre-centering and anti-dropping functions provided by the utility model is provided with three supporting components, which can meet the support requirements of the parts to be processed; for heavier parts to be processed, four, six or even more supporting components can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the structure of the sun gear;

[0019] Figure 2It is a cross-sectional view of an embodiment of the gear hobbing end drive tooling with pre-centering and anti-dropping functions of the utility model;

[0020] Description of reference numerals:

[0021] 1-strip end drive tooth; 2-supporting assembly, 21-second spring, 22-supporting column; 3-floating center; 4-parts to be processed; 5-tail top, 6-base, 7-cylinder, 8-first spring. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0023] A gear hobbing end drive tool with pre-centering and anti-drop function, see Figure 2 , including a cylindrical base 6 for rotation, a barrel 7 arranged at the upper end of the base 6, a floating top 3 arranged in the barrel 7, and three supporting components 2 evenly arranged between the inner wall of the barrel 7 and the floating top 3. The upper end of the floating top 3 is conical, and a first spring 8 is arranged at its lower end. The lower end of the first spring 8 is connected to the upper surface of the base 6. The floating top 3, the base 6 and the barrel 7 are coaxially arranged. Eight raised strip-shaped end drive teeth 1 are evenly arranged radially on the end surface of the barrel 7 away from the base 6. Two through holes for discharging waste are obliquely arranged on the side wall of the barrel 7 , the two through holes are symmetrically arranged, and their inclination direction is that the inner side is higher than the outer side; the part 4 to be processed is a combination of a disc and a slender shaft; one end of the slender shaft is arranged at the center of one end face of the disc, the other end face center of the slender shaft is provided with an upper positioning hole, and the other end face center of the disc is provided with a lower positioning hole, and the distance between the inner edge of the tooth root to be processed of the disc and the central axis of the positioning hole of the disc is greater than the distance between the outer edge of the strip end drive tooth 1 and the central axis of the floating center 3; the strip end drive tooth 1 is used to embed into the end face of the part 4 to be processed during processing and drive the part 4 to be processed to rotate.

[0024] The supporting assembly 2 includes a second spring 21 connected to the base 6 at one end and a supporting column 22 connected to the other end of the second spring 21. The supporting column 22 can cooperate with the second spring 21 to make axial movement under the action of external force; the supporting column 22 is used to support the end face of the tooth end of the part 4 to be processed.

[0025] A gear hobbing method, using the gear hobbing end drive tooling with pre-centering and anti-dropping functions, comprises the following steps:

[0026] Step 1, assemble the gear hobbing end drive tooling with pre-centering and anti-dropping functions, prepare the part 4 to be processed, and set the tail top 5 connected to the machine tool at a preset position;

[0027] Step 2, align the lower positioning hole of the part 4 to be processed with the vertex of the floating center 3, and make the supporting column 22 of each supporting assembly 2 contact the lower end surface of the part 4 to be processed;

[0028] Step 3, make the tail top 5 coaxial with the floating top 3 and slowly descend along the central axis of the part to be processed 4. After the tail top 5 completely enters the upper positioning hole, the second spring 21 is slowly pressed under the action of the tail top 5 until the strip end driving tooth 1 is embedded in the end surface of the part to be processed 4, completing the centering of the upper positioning hole and the lower positioning hole of the part to be processed 4 and the pressing of the part to be processed 4;

[0029] Step 4, the rotating mechanism of the machine tool starts to rotate, and drives the base 6, the cylinder 7, the floating center 3, and the workpiece 4 to be processed to rotate in sequence, while the tail top 5 is controlled by the machine tool and rotates at the same speed as the base 6;

[0030] Step 5: Perform gear machining operation on the part 4 to be machined.

[0031] In this embodiment, the processed part is a sun gear, and its structure is shown in FIG. Figure 1 .

[0032] Compared with the prior art, the embodiment of the utility model adds three supporting components 2, which can keep the part 4 to be processed balanced throughout the processing, and can center the upper positioning hole and the lower positioning hole of the part 4 to be processed at the same time to prevent it from tilting and falling, which is beneficial to the processing operation; in addition, for heavier parts 4 to be processed, four, six or even more supporting components 2 can be set.

[0033] It should be noted that the above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should be included in the protection scope of the present invention.

Claims

1. A gear hobbing end drive tool with a pre-centering and anti-dropping function, comprising a base (6) for rotation, a cylinder (7) arranged at the upper end of the base (6), and a floating top (3) arranged in the cylinder (7), the upper end of the floating top (3) is conical, and a first spring (8) is arranged at its lower end, and the lower end of the first spring (8) is connected to the base (6), the floating top (3), the base (6) and the cylinder (7) are coaxially arranged, and at least three protruding strip-shaped end drive teeth (1) are radially evenly arranged on the end surface of the cylinder (7) away from the base (6); the part to be processed (4) is a shaft gear part, the end surface center of the shaft end is provided with an upper positioning hole, and the end surface center of the tooth end is provided with a lower positioning hole, and the strip-shaped end drive teeth (1) are used to embed into the end surface of the tooth end of the part to be processed (4) during processing and drive the part to be processed (4) to rotate; Features: It also includes at least three supporting components (2) evenly distributed between the inner wall of the cylinder (7) and the floating top (3); The supporting assembly (2) comprises a second spring (21) connected to the base (6) at one end and a supporting column (22) connected to the other end of the second spring (21); the supporting column (22) can cooperate with the second spring (21) to perform axial movement under the action of external force; The supporting column (22) is used to support the end surface of the tooth end of the part (4) to be processed.

2. The gear hobbing end drive tooling with pre-centering and anti-dropping functions according to claim 1, characterized in that: The number of the supporting components (2) is three.

3. The gear hobbing end drive tooling with pre-centering and anti-dropping functions according to claim 1 is characterized in that: The number of the supporting components (2) is six.

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