Gear tooth end-milling edge clamp

Abstract

This utility model relates to the field of machining technology and discloses a gear tooth end milling fixture, comprising: an elastic expansion shaft with an expansion shaft portion and a platform portion; a sleeve bottom end placed on the top surface of the platform portion, and a gear placed on the top of the sleeve; the expansion shaft portion extending upward after passing through the inner holes of the sleeve and the gear in sequence; a gap being provided between the inner circumference of the sleeve and the expansion shaft portion; the inner hole diameter being less than 16 mm; a moving component located above the gear, having a tip pointing downwards; the moving component drives the tip of the tip to align with the center of the expansion shaft portion and move downwards, causing the expansion shaft portion to expand, and the outer end of the expansion shaft portion abutting against the inner hole wall of the gear to position the gear. This application achieves self-centering expansion, positioning, and clamping of the gear by moving the tip downwards, ensuring the machining accuracy of subsequent tooth end milling, realizing automated positioning and clamping of the gear, and significantly improving production efficiency. Simultaneously, the sleeve achieves stable positioning of the gear bottom.

Description

Technical Field

[0001] This utility model relates to the field of machining technology, specifically to a gear tooth end milling fixture. Background Technology

[0002] When performing end milling on gears with internal bores, it is generally necessary to first position the gear using a fixture. Only after the gear is securely positioned can the machining quality of subsequent end milling operations be ensured. Currently, a fixture using a tie rod tensioning mechanism can be inserted into the gear's internal bore to stably position the gear.

[0003] However, when the inner diameter of the gear is less than 16 mm, the size requirement of the corresponding tie rod tension fixture is even smaller. This not only makes it difficult to manufacture the tie rod tension fixture, but also makes the tie rod tension fixture weak, which seriously affects the stable positioning of the gear and thus seriously affects the machining quality of the subsequent tooth end milling operation. Utility Model Content

[0004] In view of this, the present invention provides a gear tooth end milling fixture to solve the problem that when using existing tie rod expansion type fixtures to position gears with inner holes less than 16 mm, the tie rod expansion type fixtures are difficult to manufacture and have insufficient strength, which seriously affects the stable positioning of the gears and thus seriously affects the processing quality of subsequent tooth end milling operations.

[0005] This utility model provides a gear tooth end milling fixture, comprising:

[0006] The elastic expansion shaft has a connecting expansion shaft part and a platform part; the platform part is fixed to the machine tool by a base.

[0007] A sleeve is placed at its bottom end on the top surface of the platform, and a gear is placed at the top end of the sleeve; the expansion shaft extends upward after passing through the inner holes of the sleeve and the gear in sequence; a gap is provided between the inner circumference of the sleeve and the expansion shaft; the diameter of the inner hole is less than 16 mm;

[0008] A movable component, located above the gear, has a downward-pointing tip. The movable component is adapted to align the tip of the tip with the center of the expanding shaft portion and move downwards, causing the expanding shaft portion to expand. The outer end of the expanding shaft portion abuts against the inner wall of the gear to position the gear. Beneficial effects: This application employs the above technical solution, which, by moving the tip downwards, causes the elastic expanding shaft located within the gear's inner hole to expand, achieving self-centering expansion positioning and clamping of the gear. This ensures the machining accuracy of subsequent tooth end milling, realizes automated positioning and clamping of the gear, and significantly improves production efficiency. Simultaneously, a sleeve achieves stable positioning of the gear's bottom.

[0009] Optionally, the moving component includes:

[0010] A pressure sleeve is fitted over the outside of the center point; the top end of the pressure sleeve is fixed to a machine tool via a connecting handle; the machine tool is adapted to drive the connecting handle to move up and down; the pressure sleeve is adapted to press against the top surface of the gear when moving downwards. Beneficial effects: This application adopts the above technical solution, further pressing the top of the gear with the pressure sleeve to achieve more stable positioning and clamping of the gear.

[0011] Optionally, the moving component further includes:

[0012] A linear bearing is disposed between the inner wall of the pressure sleeve and the center point; the bottom end of the linear bearing abuts against an annular step provided within the pressure sleeve; the top end of the linear bearing is limited by an elastic retaining ring through a hole provided within the pressure sleeve. Beneficial effects: This application adopts the above technical solution, which, by providing a linear bearing, facilitates the free up-and-down movement of the center point; and by using an annular step and an elastic retaining ring within the pressure sleeve, prevents the linear bearing from moving axially.

[0013] Optionally, the moving component further includes:

[0014] An elastic element is located within the pressure sleeve, and is disposed between the top surface of the tip and the bottom end of the connecting handle; the elastic element is adapted to provide a force that presses the tip of the tip downward against the expansion shaft. Beneficial effect: This application adopts the above technical solution, using an elastic element to provide a stable force for gear positioning.

[0015] Optionally, the moving component further includes:

[0016] An adjusting washer is located within the pressure sleeve and is positioned between the elastic element and the connecting handle. The adjusting washer is adapted to adjust the compression of the elastic element by selecting different thicknesses, thereby adjusting the force exerted by the tip of the center against the expansion shaft. Beneficial effect: This application employs the above technical solution, facilitating the adjustment of the force provided by the elastic element.

[0017] Optionally, the outer diameter of the sleeve is smaller than the outer diameter of the gear; the outer diameter of the pressure sleeve is smaller than the outer diameter of the gear. Beneficial effect: By adopting the above technical solution, the gear teeth are exposed, facilitating milling operations.

[0018] Optionally, a first countersunk hole is provided on the platform portion, and the platform portion is fixedly connected to the base after passing through the first countersunk hole with a first fastener; a first annular boss is provided at the top of the pressure sleeve, and a second annular boss is provided at the bottom of the connecting handle; a second countersunk hole is provided on the second annular boss; the connecting handle is fixedly connected to the first annular boss of the pressure sleeve after passing through the second countersunk hole with a second fastener.

[0019] Optionally, the elastic element is a disc spring assembly.

[0020] Optionally, the connecting handle is a Morse code connecting handle.

[0021] Optionally, a central hole is provided at the center of the top end of the expanding shaft portion, and the tip of the tip is adapted to move downward along the central hole. Beneficial effects: By adopting the above technical solution, the central hole facilitates the guidance of the tip, and when the expanding shaft portion expands, the force applied to the inner hole of the gear is more uniform, resulting in more stable gear positioning. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the gear tooth end milling fixture provided in the embodiment of this utility model;

[0024] Figure 2 This is a cross-sectional view of the elastic expansion shaft provided in the embodiment of this utility model.

[0025] Figure 3 This is a top view of the elastic expansion shaft provided in the embodiment of this utility model.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Elastic expansion shaft; 2. Expansion shaft part; 3. Base; 4. Sleeve; 5. Center; 6. Linear bearing; 7. Pressure sleeve; 8. Elastic retaining ring for hole; 9. Elastic element; 10. Connecting handle; 11. Platform part; 12. Gear; 13. Adjusting washer; 14. First fastener; 15. Second fastener; 16. Center hole; 17. Milling cutter. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0029] like Figures 1 to 3 One specific embodiment of the gear tooth end milling fixture shown includes: an elastic expansion shaft 1, a sleeve 4, and a moving assembly. The gear tooth end milling fixture described in this application is mounted on a machine tool, and after positioning the gear 12, the tooth end is milled using a milling cutter 17.

[0030] like Figure 1 As shown, the elastic expansion shaft 1 has a connected expansion shaft portion 2 and a platform portion 11; the platform portion 11 is fixed to the machine tool by a base 3. The bottom end of the sleeve 4 is placed on the top surface of the platform portion 11, and the gear 12 is placed on the top end of the sleeve 4; the expansion shaft portion 2 extends upward after passing through the inner holes of the sleeve 4 and the gear 12 in sequence; there is a gap between the inner circumference of the sleeve 4 and the expansion shaft portion 2; the diameter of the inner hole is less than 16 mm. The moving component is located above the gear 12, and the moving component has a tip 5 pointing downwards; the moving component is adapted to drive the tip of the tip 5 to align with the center of the expansion shaft portion 2 and move downwards, so that the expansion shaft portion 2 expands, and the outer end of the expansion shaft portion 2 abuts against the inner hole wall of the gear 12 to position the gear 12. After positioning the gear 12, the gear can be milled at the tooth end using a milling cutter 17 on the machine tool. The gear 12 can be a planetary gear with a small-diameter inner hole.

[0031] Specifically, such as Figure 1 As shown, the moving component of this application includes a pressure sleeve 7. The pressure sleeve 7 is sleeved on the outside of the tip 5; the top end of the pressure sleeve 7 is fixed to the machine tool by a connecting handle 10; the machine tool is adapted to drive the connecting handle 10 to move up and down; the pressure sleeve 7 is adapted to press against the top surface of the gear 12 when moving downward.

[0032] like Figure 1 As shown, the moving component described in this application further includes a linear bearing 6. The linear bearing 6 is disposed between the inner wall of the pressure sleeve 7 and the tip 5; the bottom end of the linear bearing 6 abuts against an annular step provided in the pressure sleeve 7; the top end of the linear bearing 6 is limited by an elastic retaining ring 8 through a hole provided in the pressure sleeve 7.

[0033] like Figure 1 As shown, the movable component of this application further includes an elastic element 9. The elastic element 9 is located within the pressure sleeve 7 and is disposed between the top surface of the tip 5 and the bottom end of the connecting handle 10; the elastic element 9 is adapted to provide a force that presses the tip of the tip 5 downward against the expansion shaft portion 2.

[0034] like Figure 1As shown, the moving component of this application further includes an adjusting washer 13. The adjusting washer 13 is located inside the pressure sleeve 7 and is disposed between the elastic member 9 and the connecting handle 10; the adjusting washer 13 is adapted to adjust the compression amount of the elastic member 9 by selecting different thicknesses, thereby adjusting the force of the tip of the tip 5 pressing against the expansion shaft portion 2.

[0035] Specifically, such as Figure 1 As shown, the outer diameter of the sleeve 4 is smaller than the outer diameter of the gear 12; the outer diameter of the pressure sleeve 7 is smaller than the outer diameter of the gear 12.

[0036] Specifically, such as Figure 1 As shown, a first countersunk hole is provided on the platform portion 11. The platform portion 11 is fixedly connected to the base 3 after passing through the first countersunk hole via a first fastener 14. A first annular boss is provided at the top of the pressure sleeve 7, and a second annular boss is provided at the bottom of the connecting handle 10. A second countersunk hole is provided on the second annular boss. The connecting handle 10 is fixedly connected to the first annular boss of the pressure sleeve 7 after passing through the second countersunk hole via a second fastener 15. The first fastener 14 and the second fastener 15 can both be screws.

[0037] Specifically, such as Figure 1 As shown, the elastic element 9 is a disc spring assembly.

[0038] Specifically, such as Figure 1 As shown, the connecting handle 10 is a Morse taper connecting handle.

[0039] Furthermore, such as Figure 2 and Figure 3 As shown, a central hole 16 is provided at the center of the top end of the expansion shaft portion 2, and the tip of the tip 5 is adapted to move downward along the central hole 16. The central hole 16 is a conical hole.

[0040] like Figure 1 and Figure 2 As shown, the gear tooth end milling fixture described in this application is used in the following way: The gear 12 is fitted into the expansion shaft part 2 of the elastic expansion shaft 1. The bottom end face of the gear 12 contacts the top end of the sleeve 4. The machine tool causes the center point 5 to press down, driving the moving assembly to move down as a whole. As the center point 5 moves down, it presses against the center hole 16 on the elastic expansion shaft 1. The expansion shaft part 2 of the elastic expansion shaft 1 expands until it abuts against the inner hole of the gear 12. During the process of the center point 5 pressing against the gear 12, the pressure sleeve 7 moves down to press against the end face of the gear 12. Then, the milling cutter 17 is used to perform milling operation on the tooth end of the gear 12.

[0041] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A gear tooth end milling fixture, characterized in that, include: The elastic expansion shaft (1) is provided with a connecting expansion shaft part (2) and a platform part (11); the platform part (11) is fixed to the machine tool by a base (3); A sleeve (4) is placed at its bottom end on the top surface of the platform (11), and a gear (12) is placed at the top end of the sleeve (4); the expansion shaft (2) extends upward after passing through the inner holes of the sleeve (4) and the gear (12) in sequence; a gap is provided between the inner circumference of the sleeve (4) and the expansion shaft (2); the diameter of the inner hole is less than 16 mm; A movable component is located above the gear (12). The movable component has a tip (5) with the tip pointing downwards. The movable component is adapted to drive the tip of the tip (5) to align with the center of the expansion shaft (2) and move downwards, so that the expansion shaft (2) expands and the outer end of the expansion shaft (2) abuts against the inner wall of the gear (12) to position the gear (12).

2. The gear tooth end milling fixture according to claim 1, characterized in that, The moving component includes: A pressure sleeve (7) is fitted over the outside of the tip (5); the top end of the pressure sleeve (7) is fixed to the machine tool by a connecting handle (10); the machine tool is adapted to drive the connecting handle (10) to move up and down; the pressure sleeve (7) is adapted to press against the top surface of the gear (12) when moving downward.

3. The gear tooth end milling fixture according to claim 2, characterized in that, The moving component also includes: A linear bearing (6) is disposed between the inner wall of the pressure sleeve (7) and the tip (5); the bottom end of the linear bearing (6) abuts against an annular step provided in the pressure sleeve (7); the top end of the linear bearing (6) is limited by an elastic retaining ring (8) through a hole provided in the pressure sleeve (7).

4. The gear tooth end milling fixture according to claim 3, characterized in that, The moving component also includes: An elastic element (9) is located inside the pressure sleeve (7) and is disposed between the top surface of the tip (5) and the bottom end of the connecting handle (10); the elastic element (9) is adapted to provide a force that presses the tip of the tip (5) downward against the expansion shaft portion (2).

5. The gear tooth end milling fixture according to claim 4, characterized in that, The moving component also includes: An adjusting washer (13) is located inside the pressure sleeve (7) and is disposed between the elastic element (9) and the connecting handle (10); the adjusting washer (13) is adapted to adjust the compression of the elastic element (9) by selecting different thicknesses, thereby adjusting the force of the tip of the tip (5) pressing against the expansion shaft (2).

6. The gear tooth end milling fixture according to any one of claims 2-5, characterized in that, The outer diameter of the sleeve (4) is smaller than that of the gear (12); the outer diameter of the pressure sleeve (7) is smaller than that of the gear (12).

7. The gear tooth end milling fixture according to any one of claims 2-5, characterized in that, A first countersunk hole is provided on the platform part (11). The platform part (11) is fixedly connected to the base (3) after passing through the first countersunk hole by the first fastener (14). A first annular boss is provided at the top of the pressure sleeve (7). A second annular boss is provided at the bottom of the connecting handle (10). A second countersunk hole is provided on the second annular boss. The connecting handle (10) is fixedly connected to the first annular boss of the pressure sleeve (7) after passing through the second countersunk hole by the second fastener (15).

8. The gear tooth end milling fixture according to claim 4 or 5, characterized in that, The elastic element (9) is a disc spring assembly.

9. The gear tooth end milling fixture according to any one of claims 2-5, characterized in that, The connecting handle (10) is a Morse code connecting handle.

10. The gear tooth end milling fixture according to any one of claims 1-5, characterized in that, A central hole (16) is provided at the top center of the expansion shaft (2), and the tip of the tip (5) is adapted to move downward along the central hole (16).

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