A hobbing fixture for gear machining

Abstract

The utility model relates to gear machining technical field, concretely relates to a gear machining frock is used hobbing fixture, and servo motor provides accurate controllable rotation power source, and the clamping plate directly contacts and fixes the gear inner hole surface through radial displacement, and the limiting plate restrains the maximum expansion stroke of the clamping plate and prevents overload damage, and the movable groove provides stable axial movement track for the taper buckle, rotates through servo motor drive screw, drives the taper buckle axial movement and pushes movable block radial expansion, makes the antiskid layer of clamping plate end even pressure gear inner hole, and the protection board effectively isolates processing pollution, and this closed loop control system has improved the repeat positioning accuracy and processing stability of gear clamping significantly, and the limiting rod of clamping plate inboard restricts its movement along the set trajectory only, avoids the clamping deviation caused by deflection, and the fastening bolt can adjust the antiskid layer pressure flexibly to different hole diameter gear.

Description

Technical Field

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

[0002] As a core component of mechanical transmission, gears have undergone a long period of development and have formed a complete system of processing technology. Common processing methods include gear hobbing, which cuts involute tooth profiles by continuous meshing motion between the tool and the workpiece; gear shaping, which uses a tool with reciprocating motion to process precise tooth profiles on the workpiece; gear milling, which uses a forming milling cutter to cut tooth by tooth and is suitable for single-piece and small-batch production; gear grinding, which improves the surface quality and accuracy of gears through grinding wheel finishing; and finishing processes such as shaving and honing, which are used to improve the surface roughness of the gears. Each processing method has specific technical requirements for the positioning and clamping of the workpiece.

[0003] Among the many gear processing equipment, the gear hobbing fixture is a key supporting device for gear hobbing machines. Its performance directly affects the gear processing accuracy and production efficiency. Modern gear hobbing fixtures adopt a modular design concept and achieve rapid workpiece positioning through precision transmission mechanisms and adaptive clamping elements. Compared with traditional fixtures, they have better process adaptability and automation, and are particularly suitable for the production needs of large-volume gear processing.

[0004] Traditional gear clamps generally use a center bolt fixing method, where tightening the bolt presses the clamping surface against the gear's inner hole. While this method is simple in structure, it has obvious limitations. When machining gears with different hole diameters, the entire clamping set needs to be replaced or an intermediate sleeve needs to be added. Frequent disassembly and assembly operations severely affect production efficiency. At the same time, uneven distribution of bolt clamping force can easily lead to gear deformation, making it difficult to meet the machining requirements of high-precision gears. This rigid clamping method has become a bottleneck problem restricting the flexible production of gear machining. Utility Model Content

[0005] The purpose of this utility model is to provide a gear hobbing fixture for gear machining, which solves the problem that traditional gear fixtures cannot be adapted to gears with various bore diameters.

[0006] To achieve the above objectives, this utility model provides a gear hobbing fixture for gear machining, including a guide rod, a sleeve rod fixedly mounted on the right end of the guide rod, a protective plate fixedly mounted on the right side of the sleeve rod, a servo motor fixedly mounted on the right side of the protective plate, clamping plates movably mounted at the upper and lower ends of the sleeve rod, a limit plate fixedly mounted on the inner side of the clamping plate, and a movable groove opened inside the sleeve rod. The guide rod serves as an initial positioning reference to ensure that the gear element enters the clamping area along a straight path. The sleeve rod serves as a core load-bearing frame, integrating the drive mechanism and clamping components to form a rigid support system. The protective plate isolates machining debris and protects the internal precision transmission components. The servo motor provides a precise and controllable rotational power source. The clamping plate directly contacts and fixes the inner surface of the gear hole through radial displacement. The limit plate constrains the maximum expansion stroke of the clamping plate to prevent overload damage. The movable groove provides a stable axial movement track for the tapered buckle.

[0007] The sleeve rod is internally equipped with a tapered buckle, and the tapered buckle has a through hole inside. The tapered buckle converts the rotational motion of the screw into its own linear displacement, and the through hole forms a precise fit channel between the screw and the tapered buckle.

[0008] The through hole is fixedly provided with an internal thread, and the upper and lower ends of the tapered buckle are movably provided with movable blocks. The internal thread realizes the conversion and transmission of rotational motion and linear motion, and the movable blocks convert the axial thrust of the tapered buckle into radial expansion force.

[0009] A limit rod is fixedly installed between the movable block and the clamping plate, and a damper is fixedly installed between the movable block and the clamping plate. The limit rod ensures that the clamping plate moves in a straight line along a set trajectory without deflection, and the damper provides a buffering and shock absorption function and maintains a constant clamping force during the clamping process.

[0010] The clamping plate is fixedly provided with an anti-slip layer at the end away from the movable block. The upper end of the anti-slip layer has a groove, and a fastening bolt is fixedly provided inside the groove. The anti-slip layer increases the friction between the anti-slip layer and the workpiece contact surface through its surface texture. The groove serves as an adjustment interface, allowing the fastening bolt to change the clamping pressure. The effective clamping range of the anti-slip layer can be adjusted by the depth of the thread screwing into the fastening bolt.

[0011] A screw rod is installed through the through hole. The screw rod is connected to the output shaft of the servo motor through a coupling. The screw rod, as the core transmission component, converts the motor torque into linear traction force. The coupling compensates for installation errors and ensures the coaxial accuracy of power transmission.

[0012] A servo motor drives the screw to rotate, causing the tapered buckle to move axially and pushing the movable block to expand radially. This ensures that the anti-slip layer at the end of the clamping plate evenly presses against the inner hole of the gear. The entire process requires no manual intervention. The guide rod ensures the straightness of the gear's initial positioning, the limit plate precisely controls the expansion stroke of the clamping plate, the damper continuously provides stable clamping force and absorbs vibration, the coupling ensures the coaxiality of power transmission, and the protective plate effectively isolates processing contaminants. This closed-loop control system significantly improves the repeatability and stability of gear clamping. The limit rod on the inner side of the clamping plate constrains its movement only along the set trajectory, avoiding clamping deviations caused by deflection. The fastening bolts can flexibly adjust the pressure of the anti-slip layer for gears with different hole diameters. The precision thread fit between the through hole and the screw eliminates transmission clearance, and the movable groove provides a stable guiding reference for the tapered buckle. When processing abnormalities occur, the damper can buffer sudden impact forces, and the grooves on the surface of the anti-slip layer enhance friction while dispersing stress. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0014] Figure 1 This is a schematic diagram of the overall structure of the gear hobbing fixture for gear machining according to an embodiment of this utility model.

[0015] Figure 2 This is a cross-sectional structural diagram of a gear hobbing fixture for gear machining according to an embodiment of this utility model.

[0016] Figure 3 This is an embodiment of the present utility model. Figure 1 A magnified view of A in the middle.

[0017] Figure 4 This is an embodiment of the present utility model. Figure 2 A magnified view of B in the middle.

[0018] 1. Guide rod, 2. Sleeve rod, 3. Protective plate, 4. Servo motor, 5. Clamping plate, 6. Limiting plate, 7. Movable groove, 8. Tapered buckle, 9. Through hole, 10. Internal thread, 11. Movable block, 12. Limiting rod, 13. Damper, 14. Anti-slip layer, 15. Groove, 16. Fastening bolt, 17. Screw, 18. Coupling. Detailed Implementation

[0019] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0020] Please see Figures 1-4A gear hobbing fixture for gear machining includes a guide rod 1, a sleeve rod 2 fixedly mounted on the right end of the guide rod 1, a protective plate 3 fixedly mounted on the right side of the sleeve rod 2, a servo motor 4 fixedly mounted on the right side of the protective plate 3, clamping plates 5 movably mounted at the upper and lower ends of the sleeve rod 2, a limit plate 6 fixedly mounted on the inner side of the clamping plate 5, and a movable groove 7 machined inside the sleeve rod 2. The guide rod 1 serves as the initial guiding component for the gear workpiece, ensuring that the workpiece smoothly enters the center of the fixture along a straight path. The sleeve rod 2 constitutes the main frame of the fixture, providing an installation reference and support structure for all moving parts. The protective plate 3, installed at the power end, effectively blocks cutting fluid and metal chips from entering the motor. The servo motor 4, as the core power source, achieves intelligent adjustment of clamping force through precise speed control. The clamping plate 5, as the direct clamping component, achieves adaptive clamping for gear inner holes of different sizes through radial movement. The limit plate 6, fixed inside the clamping plate, limits its maximum expansion range to prevent overload damage. The movable groove 7, machined inside the sleeve rod, provides precise guidance for the axial movement of the tapered buckle.

[0021] The sleeve rod 2 has a tapered buckle 8 inside, and a through hole 9 inside the tapered buckle 8. An internal thread 10 is fixed inside the through hole 9. Movable blocks 11 are movably arranged at the upper and lower ends of the tapered buckle 8. A limit rod 12 is fixed between the movable block 11 and the clamping plate 5. A damper 13 is fixed between the movable block 11 and the clamping plate 5. The tapered buckle 8 converts axial movement into radial thrust through its internal tapered surface to drive the clamping mechanism. The through hole 9 passes through the center of the tapered buckle to provide a smooth passage for the screw. The internal thread 10 is machined in the through hole to form a precision helical pair with the screw to realize motion conversion. The movable block 11 acts as a force transmission medium to evenly distribute the thrust of the tapered buckle to the clamping plates on both sides. The limit rod 12 connects the movable block and the clamping plate to ensure that the clamping movement is along a straight trajectory. The damper 13 provides a buffering effect during clamping and maintains a constant clamping force during processing.

[0022] An anti-slip layer 14 is fixedly installed at the end of the clamping plate 5 away from the movable block 11. A groove 15 is opened at the upper end of the anti-slip layer 14. A fastening bolt 16 is fixedly installed inside the groove 15. A screw 17 is installed through the through hole 9. The screw 17 is connected to the output shaft end of the servo motor 4 through the coupling 18. The anti-slip layer 14 is made of a high friction coefficient material to enhance clamping stability and prevent the workpiece from slipping. The groove 15 is machined on the surface of the anti-slip layer to provide an installation position for the fastening bolt. The fastening bolt 16 can change the effective clamping range of the anti-slip layer by adjusting the screwing depth. The screw 17, as the core transmission component, converts the rotational motion of the motor into linear traction force. The coupling 18 connects the motor output shaft and the screw to compensate for installation errors and ensure the coaxial accuracy of power transmission.

[0023] Working principle: When this gear hobbing fixture is working, the gear component to be processed is first inserted axially along the guide rod 1. The guide rod 1 ensures that the gear component is accurately guided into the clamping plate 5 in the sleeve rod 2 area. At this time, the servo motor 4 drives the screw 17 to rotate through the coupling 18 under the cooperation of the internal thread 10, causing the tapered buckle 8 to move axially to the left along the movable groove 7. The tapered surface of the tapered buckle 8 pushes the movable block 11 to move radially outward. The movable block 11 drives the clamping plate 5 to expand outward synchronously through the limit rod 12. The anti-slip layer 14 at the end of the clamping plate 5 gradually presses against the inner wall of the gear component. During this process, the damper 13 continuously provides radial clamping force and absorbs vibration. The limit plate 6 constrains the clamping plate. The maximum expansion displacement of plate 5 is to prevent overload. The clamping pressure of anti-slip layer 14 can be adjusted by the fastening bolt 16 through the slot 15. After the gear component is completely fixed, the protective plate 3 effectively isolates the debris generated during processing from entering the servo motor 4. After the gear hobbing is completed, the servo motor 4 rotates in reverse to move the tapered buckle 8 to the right. The movable block 11 drives the clamping plate 5 to retract under the elastic reset action of the damper 13, so that the finished gear can be safely taken out. During the whole process, the limit rod 12 ensures that the clamping plate 5 moves along a straight trajectory. The precise fit between the through hole 9 and the screw 17 achieves zero backlash in the transmission. The sleeve rod 2, as the core load-bearing structure, integrates all functional components to form a rigid support system.

[0024] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A gear hobbing fixture for gear machining, comprising a guide rod (1), characterized in that, A sleeve rod (2) is fixedly installed at the right end of the guide rod (1), a protective plate (3) is fixedly installed on the right side of the sleeve rod (2), a servo motor (4) is fixedly installed on the right side of the protective plate (3), clamping plates (5) are movably installed at the upper and lower ends of the sleeve rod (2), a limit plate (6) is fixedly installed on the inner side of the clamping plate (5), and a movable groove (7) is opened inside the sleeve rod (2).

2. The gear hobbing fixture for gear machining as described in claim 1, characterized in that, The sleeve (2) is provided with a tapered buckle (8) inside, and the tapered buckle (8) has a through hole (9) inside.

3. The gear hobbing fixture for gear machining as described in claim 2, characterized in that, The through hole (9) is fixedly provided with an internal thread (10), and the upper and lower ends of the tapered buckle (8) are movably provided with movable blocks (11).

4. The gear hobbing fixture for gear machining as described in claim 3, characterized in that, A limit rod (12) is fixedly provided between the movable block (11) and the clamping plate (5), and a damper (13) is fixedly provided between the movable block (11) and the clamping plate (5).

5. The gear hobbing fixture for gear machining as described in claim 3, characterized in that, An anti-slip layer (14) is fixedly provided at the end of the clamp (5) away from the movable block (11). A groove (15) is provided at the upper end of the anti-slip layer (14), and a fastening bolt (16) is fixedly provided inside the groove (15).

6. The gear hobbing fixture for gear machining as described in claim 2, characterized in that, A screw (17) is installed through the inside of the through hole (9), and the screw (17) is connected to the output shaft end of the servo motor (4) through a coupling (18).

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