Hobbing clamp

Abstract

The utility model discloses a hobbing clamp which comprises a mounting seat, a butt joint seat is fixedly connected to the top of the mounting seat, a rectangular cavity is formed between the mounting seat and the butt joint seat, a through hole is formed in the top of the butt joint seat, a driving rod is rotationally connected to the interior of the through hole, a threaded hole is formed in the bottom of the driving rod, and a clamping groove is formed in the bottom of the threaded hole. The inner wall of the threaded hole is in threaded connection with a lead screw, and the bottom of the lead screw is fixedly connected with the inner wall of the rectangular cavity. The synchronous radial expansion structure of the multiple expansion blocks is adopted, uniform stress clamping of the inner wall of a workpiece is achieved, the problem of stress concentration caused by traditional single-point clamping is effectively solved, the clamping stability is remarkably improved, the vibration influence in the machining process is greatly reduced through the damping effect of compressed gas, and the machining quality is improved. The machining surface quality is obviously improved, the clamp has excellent adaptability due to the modular expansion block design, the machining requirements of workpieces of different sizes and shapes can be met, and the application range is wider.

Description

Technical Field

[0001] This utility model relates to the field of gear hobbing technology, and in particular to a gear hobbing fixture. Background Technology

[0002] Gear hobbing is a gear machining method based on the generating method. It uses a hob to machine gears, similar to the meshing of helical cylindrical gear pairs. During gear hobbing, the hob and gear blank are forced to mesh according to the gear and rack transmission ratio. The continuous transmission of the hob forms the involute tooth profile of the workpiece. Since the gear needs to be fixed in position during machining, a gear hobbing fixture is required.

[0003] In the existing technology, traditional clamping fixtures use a single clamping point, which leads to uneven clamping, lack of multi-point synchronous expansion mechanism, insufficient clamping stability, poor adaptability to irregular inner holes, and the vibration of the workpiece during processing directly affects the surface quality. Therefore, we propose a gear hobbing fixture to solve the above problems. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a gear hobbing fixture.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A gear hobbing clamp includes a mounting base, a mating seat fixedly connected to the top of the mounting base, a rectangular cavity formed between the mounting base and the mating seat, a through hole formed at the top of the mating seat, a drive rod rotatably connected inside the through hole, a threaded hole formed at the bottom of the drive rod, a lead screw threadedly connected to the inner wall of the threaded hole, the bottom of the lead screw fixedly connected to the inner wall of the rectangular cavity, a worm gear fixedly sleeved on the outer wall of the drive rod, a worm rotatably connected to the inner wall of the rectangular cavity, the worm and the worm gear meshing with each other, a rectangular piston fixedly sleeved on the outer wall of the drive rod, an air cavity formed on the outer wall of the mounting base, an air inlet connector fixedly connected to the inner wall of the air cavity, and a clamping assembly provided on the outer wall of the drive rod.

[0007] Preferably, the clamping assembly includes multiple expansion blocks, and two conical push blocks are fixedly sleeved on the outer wall of the drive rod. The outer walls of the two conical push blocks are slidably connected to the outer walls of the multiple expansion blocks respectively. The multiple expansion blocks are fixedly connected to rubber blocks in pairs. By setting the rubber blocks, the multiple expansion blocks can have the ability to reset, and the rubber blocks themselves have the ability to deform elastically.

[0008] Preferably, a bearing is fixedly sleeved on the outer wall of the worm gear, and the outer ring of the bearing is fixedly connected to the inner wall of the rectangular cavity. The bearing assists the worm gear to rotate stably.

[0009] Preferably, one end of the worm gear has a diamond-shaped groove, and one end of the air inlet connector is fixedly connected to an air pump.

[0010] Preferably, the outer wall of the mounting base has a through hole, the inner wall of the through hole is rotatably connected to the outer wall of the worm gear, and a sealing design is provided between the through hole and the worm gear.

[0011] Preferably, a U-shaped sealing ring is fixedly sleeved on the outer wall of the rectangular piston, and the outer wall of the U-shaped sealing ring is slidably connected to the inner wall of the rectangular cavity. The sealing performance between the rectangular piston and the rectangular cavity is increased by setting the U-shaped sealing ring.

[0012] Preferably, the top of the drive rod is provided with a docking hole, and the inner wall of the docking hole is threaded with a top cover. The top cover is used to assist the movement of multiple expansion blocks and to limit them on two conical push blocks.

[0013] Compared with the prior art, the advantages of this utility model are:

[0014] This solution employs a synchronous radial expansion structure with multiple expansion blocks, achieving uniform force clamping on the inner wall of the workpiece. This effectively solves the stress concentration problem caused by traditional single-point clamping, significantly improving clamping stability. Through the damping effect of compressed gas, the vibration impact during processing is greatly reduced, resulting in a significant improvement in the surface quality of the machined parts. The modular expansion block design gives the fixture excellent adaptability, meeting the processing needs of workpieces of different sizes and shapes, and thus having a wider range of applications. Attached Figure Description

[0015] To more clearly illustrate the technical solution of this utility model, the drawings used in the description of the specific embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a three-dimensional structural diagram of a gear hobbing clamp proposed in this utility model;

[0017] Figure 2 This is a cross-sectional structural diagram of a gear hobbing fixture proposed in this utility model;

[0018] Figure 3 This utility model proposes a gear hobbing clamp. Figure 2 A magnified structural diagram of part A in the diagram;

[0019] Figure 4 This is a partial three-dimensional structural diagram of a gear hobbing fixture proposed in this utility model.

[0020] In the diagram: 1. Mounting base; 2. Connecting base; 3. Drive rod; 4. Lead screw; 5. Worm gear; 6. Worm wheel; 7. Rectangular piston; 8. U-shaped sealing ring; 9. Air chamber; 10. Air inlet connector; 11. Diamond groove; 12. Conical push block; 13. Expansion block; 14. Rubber block; 15. Top cover. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0022] Depend on Figures 1-4 As shown, a gear hobbing fixture is disclosed, including a mounting base 1, a mating seat 2 fixedly connected to the top of the mounting base 1, the mounting base 1 and the mating seat 2 being fixed in position by existing multiple bolts, a rectangular cavity being formed between the mounting base 1 and the mating seat 2, a through hole being formed at the top of the mating seat 2, a drive rod 3 being rotatably connected inside the through hole, a threaded hole being formed at the bottom of the drive rod 3, a lead screw 4 being threadedly connected to the inner wall of the threaded hole, the bottom of the lead screw 4 being fixedly connected to the inner wall of the rectangular cavity, the drive rod 3 moving up and down through the lead screw 4, and the drive rod 3 moving up and down within the rectangular cavity through a rectangular piston 7.

[0023] A worm gear 6 is fixedly sleeved on the outer wall of the drive rod 3. A worm 5 is rotatably connected to the inner wall of the rectangular cavity. A through hole is opened on the outer wall of the mounting base 1. The inner wall of the through hole is rotatably connected to the outer wall of the worm 5. A bearing is fixedly sleeved on the outer wall of the worm 5. The outer ring of the bearing is fixedly connected to the inner wall of the rectangular cavity. The worm 5 and the worm gear 6 are meshed. The rotation of the worm gear 6 causes the drive rod 3 to rotate through the lead screw 4. The movement of the drive rod 3 drives the two conical push blocks 12 to move up and down.

[0024] A rectangular piston 7 is fixedly sleeved on the outer wall of the drive rod 3. A U-shaped sealing ring 8 is fixedly sleeved on the outer wall of the rectangular piston 7. The outer wall of the U-shaped sealing ring 8 is slidably connected to the inner wall of the rectangular cavity. The U-shaped sealing ring 8 increases the sealing between the rectangular piston 7 and the rectangular cavity. An air chamber 9 is opened on the outer wall of the mounting base 1. An air inlet connector 10 is fixedly connected to the inner wall of the air chamber 9. A diamond-shaped groove 11 is opened at one end of the worm gear 5. An air pump is fixedly connected to one end of the air inlet connector 10. An existing exhaust valve is installed at the output end of the air pump for exhaust operation of the rectangular cavity.

[0025] The outer wall of the drive rod 3 is provided with a clamping assembly, which includes multiple expansion blocks 13. Two conical push blocks 12 are fixedly sleeved on the outer wall of the drive rod 3. After the two conical push blocks 12 press against the outer wall of the multiple expansion blocks 13, they move outward. The contact surfaces of the multiple expansion blocks 13 and the two conical push blocks 12 are conical. The outer walls of the two conical push blocks 12 are slidably connected to the outer walls of the multiple expansion blocks 13 respectively. The multiple expansion blocks 13 are fixedly connected to rubber blocks 14 in pairs. The top of the drive rod 3 is provided with a docking hole, and the inner wall of the docking hole is threaded with a top cover 15.

[0026] Working principle: In use, the mounting base 1 is fixed on the existing gear hobbing machine. When clamping the workpiece, the workpiece is fitted onto the outer wall of multiple expansion blocks 13. The right side of the existing hex wrench is inserted into the diamond-shaped slot 11. Rotating the worm gear 5 drives the worm wheel 6 to rotate. The rotation of the worm wheel 6 causes the drive rod 3 to rotate through the lead screw 4. The drive rod 3 moves upward, driving the two conical push blocks 12 to move upward. The upward movement of the two conical push blocks 12 causes the multiple expansion blocks 13 to expand outward. After the multiple expansion blocks 13 expand, they are pressed against the inner wall of the workpiece to fix its position. The compressed gas can be introduced into the rectangular cavity through the air inlet connector 10 and the air chamber 9 by the operation of the air pump. The rectangular cavity is filled with compressed gas, so that the bottom of the rectangular piston 7 bears the upward pressure, which plays a stabilizing role. In addition, the compressed gas in the rectangular cavity plays a vibration damping role. The main gas has viscous resistance when flowing in the rectangular cavity, which has a suppressive effect on high-frequency micro vibrations.

[0027] All standard parts used in this utility model can be purchased from the market. Irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. In addition, the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. Furthermore, the structure and principle of the components known to those skilled in the art can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0028] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A gear hobbing fixture, comprising a mounting base (1), characterized in that, The top of the mounting base (1) is fixedly connected to a docking seat (2). A rectangular cavity is provided between the mounting base (1) and the docking seat (2). A through hole is provided at the top of the docking seat (2). A drive rod (3) is rotatably connected inside the through hole. A threaded hole is provided at the bottom of the drive rod (3). A lead screw (4) is threadedly connected to the inner wall of the threaded hole. The bottom of the lead screw (4) is fixedly connected to the inner wall of the rectangular cavity. A worm gear (6) is fixedly sleeved on the outer wall of the drive rod (3). A worm (5) is rotatably connected to the inner wall of the rectangular cavity. The worm (5) and the worm gear (6) are meshed together. A rectangular piston (7) is fixedly sleeved on the outer wall of the drive rod (3). An air chamber (9) is provided on the outer wall of the mounting base (1). An air inlet connector (10) is fixedly connected to the inner wall of the air chamber (9). A clamping assembly is provided on the outer wall of the drive rod (3).

2. The gear hobbing fixture according to claim 1, characterized in that, The clamping assembly includes multiple expansion blocks (13), and two conical push blocks (12) are fixedly sleeved on the outer wall of the drive rod (3). The outer walls of the two conical push blocks (12) are slidably connected to the outer walls of the multiple expansion blocks (13), and the multiple expansion blocks (13) are fixedly connected to rubber blocks (14) in pairs.

3. A gear hobbing fixture according to claim 1, characterized in that, The outer wall of the worm (5) is fixedly fitted with a bearing, and the outer ring of the bearing is fixedly connected to the inner wall of the rectangular cavity.

4. A gear hobbing fixture according to claim 1, characterized in that, One end of the worm gear (5) is provided with a diamond-shaped slot (11), and one end of the air inlet connector (10) is fixedly connected to an air pump.

5. A gear hobbing fixture according to claim 1, characterized in that, The outer wall of the mounting base (1) is provided with a through hole, and the inner wall of the through hole is rotatably connected to the outer wall of the worm (5).

6. A gear hobbing fixture according to claim 1, characterized in that, The outer wall of the rectangular piston (7) is fixedly fitted with a spiral-shaped sealing ring (8), and the outer wall of the spiral-shaped sealing ring (8) is slidably connected to the inner wall of the rectangular cavity.

7. A gear hobbing fixture according to claim 1, characterized in that, The top of the drive rod (3) is provided with a docking hole, and the inner wall of the docking hole is threaded with a top cover (15).

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