Fine-tuning high-precision gear shaping clamp

Abstract

The utility model discloses a fine-adjustment high-precision gear shaping clamp, and belongs to the field of machining equipment. The device is installed on a gear shaping machine tool and comprises a base, a pull rod, a chuck, an upper base and an installation adjusting assembly. The upper seat is detachably fixed on the base through a mounting adjusting assembly, a mounting hole is formed in the top of the upper seat, the chuck is arranged in the mounting hole, and an inner hole is formed in the top end of the chuck and used for clamping a workpiece; the base is connected with a gear shaping machine tool flange, a through inner hole is machined in the base, the pull rod is arranged in the inner hole in a penetrating mode and connected with the driving end of the gear shaping machine tool, and the tail of the chuck is in threaded connection with the shaft end of the pull rod. The special precise fixture for the slotting machine is used for solving the problems of long manufacturing period, high cost and tedious replacement, adjustment and correction, the cost is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of processing equipment, and in particular to a fine-tuning high-precision gear hobbing fixture. Background Technology

[0002] In the field of machining, CNC gear shaper machines are key equipment used to process gears and other toothed parts. As the manufacturing industry's requirements for gear precision continue to increase, more stringent standards are being placed on the fixture precision of gear shaper machines. Tooth radial runout is one of the important indicators for measuring gear precision. For workpieces with high requirements for tooth radial runout, high-precision fixtures are needed to ensure machining quality.

[0003] Currently, the precision fixtures commonly used in CNC vertical gear hobbing machines are mostly integral structures, with the base and upper seat being a fixed integrated design. These fixtures typically achieve high-precision coaxiality through integral machining, but still have many shortcomings.

[0004] 1. Long production cycle and high cost: The integral fixture needs to achieve coaxiality requirements through high-precision integral machining. The machining process is complex, resulting in a long production cycle and an inability to quickly respond to market demands. In addition, the material cost is high, and the machining and assembly process requires high-precision equipment and skilled technicians, which further increases the manufacturing cost.

[0005] 2. Cumbersome adjustment and calibration, resulting in low production efficiency: When processing workpieces of different specifications, the integral fixture is difficult to adapt to different coaxiality requirements through adjustment. When it is necessary to change to workpieces of different specifications for processing, it is necessary to disassemble and recalibrate, which is not only time-consuming and labor-intensive, but also leads to low production efficiency.

[0006] 3. Poor accuracy retention: The overall fixture may affect the machining accuracy due to improper adjustment.

[0007] Therefore, designing a new type of gear hobbing fixture to solve the above problems is of great significance for improving the processing efficiency and product quality of CNC gear hobbing machine tools. Utility Model Content

[0008] This invention provides a fine-tuning high-precision gear-shaping fixture, which can solve the problems of long manufacturing cycle, high cost, and cumbersome replacement, adjustment and calibration of special precision fixtures for slotting machines in the prior art, thereby reducing costs and improving production efficiency.

[0009] A fine-tuning high-precision gear hobbing fixture, installed on a gear hobbing machine tool, includes a base, a pull rod, a chuck, an upper seat, and mounting and adjusting components;

[0010] The upper seat is detachably fixed to the base by means of an adjustment assembly. The upper seat has a mounting hole at the top and the chuck is located in the mounting hole. The top of the chuck has an inner hole for clamping the workpiece.

[0011] The base is connected to the flange of the gear shaping machine tool. The base has a through inner hole. The pull rod passes through the inner hole and is connected to the drive end of the gear shaping machine tool. The tail of the chuck is threaded to the end of the pull rod shaft.

[0012] Furthermore, the base has a stepped hole at the top, and the upper seat has a boss structure at the bottom that fits with the stepped hole.

[0013] Furthermore, the fitting clearance between the outer circle of the bottom boss of the upper seat and the stepped hole of the base is 0.05mm.

[0014] Furthermore, the installation adjustment assembly includes adjusting screws and locking bolts. Multiple adjusting screws are provided and arranged circumferentially around the stepped hole at the top of the base. The locking bolt is located between the base and the upper seat.

[0015] Furthermore, the adjusting screws are evenly distributed around the stepped hole at the top of the base, and the number is no less than three.

[0016] Furthermore, the upper seat is a detachable split structure, the top of the mounting hole is an inner conical hole, the outer surface of the chuck is provided with an outer conical surface, and the taper of the inner conical hole is adapted to the outer conical surface of different models of chucks.

[0017] Furthermore, it also includes an end cap, which is fixed to the end face of the upper seat by bolts.

[0018] Furthermore, it also includes a center point, the tail of which is provided with a center point mounting hole, and the center point is fixed in the center point mounting hole by threads and located at the bottom of the workpiece.

[0019] Furthermore, the tip front end is provided with a 60° conical positioning surface.

[0020] Furthermore, the inner hole at the upper end of the chuck is clearance-fitted with the workpiece clamping surface, and the clearance is 0.01-0.03mm.

[0021] The beneficial effects of this utility model are:

[0022] 1. This utility model provides a fine-tuning high-precision gear hobbing fixture. The upper seat is detachably connected to the base via an adjustment component. When machining workpieces of different specifications, the chuck and the inner hole of the upper seat allow for quick changes in clamping mechanisms of different specifications, significantly shortening product changeover time, facilitating operation, and improving production efficiency. Furthermore, compared to integral fixtures, the upper seat, chuck, and other components of this fixture can be machined independently, simplifying high-precision machining processes, reducing production costs, and facilitating later maintenance and component replacement.

[0023] 2. In this utility model, the installation of the adjustment component can achieve precise adjustment of the coaxiality between the inner hole of the upper seat and the machine tool flange by adjusting the fitting clearance between the upper seat and the base, thus ensuring strict alignment between the workpiece clamping reference and the machining axis.

[0024] 3. In this utility model, the tail of the chuck is threaded to the end of the pull rod shaft. The pull rod is driven to move axially through the machine tool drive end, which can accurately control the clamping and loosening of the chuck. The transmission structure is stable and the clamping force is uniform and reliable. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of a fine-tuning high-precision gear-shaping fixture structure provided in Example 1;

[0026] Figure 2 This is a partial structural diagram of a fine-tuning high-precision gear-shaping fixture provided in Example 2.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Machine tool flange; 2. Base; 3. Upper seat; 4. Tie rod; 5. Chuck; 6. End cover; 7. Locking bolt; 8. Adjusting screw; 9. Center; 10. Gear shaft; 11. Double gear. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] like Figure 1 As shown in the figure, the present invention provides a fine-tuning high-precision gear hobbing fixture, which is installed on a gear hobbing machine tool and includes a base 2, a pull rod 4, a chuck 5, an upper seat 3, a mounting and adjustment component, an end cover 6, and a center 9.

[0031] The base 2 is connected to the flange 1 of the gear hobbing machine via a stop structure and is fixed with bolts. A through-hole is machined in the center of the base 2, through which the tie rod 4 passes and connects to the drive end of the machine tool's hydraulic cylinder. The chuck 5 has an external thread at its tail, which connects to the internal thread at the shaft end of the tie rod 4, enabling axial movement of the chuck 5. A stepped hole is machined at the top of the base 2, and a boss structure with a clearance fit to the stepped hole is provided at the bottom of the upper seat 3. The clearance between the outer circle of the boss at the bottom of the upper seat 3 and the stepped hole of the base 2 is 0.05mm. The installation adjustment assembly enables the upper seat 33 to be detachably fixed on the base 21 and allows for fine-tuning of its coaxiality.

[0032] The upper seat 3 has a mounting hole at its top, and the chuck 5 is housed within the mounting hole. The upper seat 3 is a detachable, split structure. The top of the mounting hole is an inner conical hole, and the outer surface of the chuck 5 has an outer conical surface. The taper of the inner conical hole is adapted to the outer conical surface of different models of chuck 5. By changing the upper seat 3 with different inner conical hole tapers, different models of chuck 5 can be adapted to their outer conical surfaces, enabling rapid switching between various workpiece specifications. The top of the chuck 5 has an inner hole for clamping the workpiece, and the inner hole at the top of the chuck 5 has a clearance fit with the workpiece clamping surface, with a clearance of 0.01-0.03mm to ensure radial positioning accuracy of the workpiece. The tail of the chuck 5 has a mounting hole for a center point 9, which is fixed in place by threads within the mounting hole and located at the bottom of the workpiece. Its front end has a 60° conical locating surface for axial positioning of the workpiece.

[0033] The end cap 6 is fixed to the top end face of the upper seat 3 by bolts, covering the exposed part of the chuck 5 and preventing machining debris from entering the conical mating area.

[0034] Specifically, such as Figure 1 As shown, the installation adjustment assembly includes adjusting screws 8 and locking bolts 7. The locking bolts 7 are located between the base 2 and the upper seat 3 to fasten the upper seat 3 and the base 2. The number of adjusting screws 8 is not less than three, preferably six. In this embodiment, the six adjusting screws 8 are evenly arranged circumferentially around the stepped hole at the top of the base 2, which can achieve radial fine adjustment of the workpiece to a higher radial runout requirement. By turning the adjusting screws 8, the bottom boss of the upper seat 3 can be pushed to move slightly within the stepped hole, realizing the coaxiality adjustment between the inner tapered hole of the upper seat 3 and the machine tool flange 1. After the adjustment is completed, the adjusting screws 8 are locked with nuts to prevent loosening.

[0035] Taking the machining of gear shaft 10 and double gear 11 as an example, such as Figure 1 and Figure 2 As shown, the operating principle of this embodiment is as follows.

[0036] 1. Fixture installation and initial positioning: Install the fixture base 2 on the machine tool flange 1 of the gear hobbing machine through the stop positioning, and ensure that the coaxiality between the top step hole of the base 2 and the machine tool flange 1 is less than 0.005mm. Then fix the base 2 with bolts.

[0037] 2. Precision adjustment of the coaxiality of the upper seat 3: Insert the bottom boss of the upper seat 3 into the stepped hole of the base 2. First, moderately tighten the locking bolt 7 to maintain a moderate preload. Then, by turning the adjusting screw 8, push the bottom boss of the upper seat 3 to move slightly within a gap range of 0.05mm. Use a dial indicator to check the coaxiality between the inner tapered hole of the upper seat 3 and the machine tool flange 1 until the coaxiality error is less than 0.005mm. Finally, fully tighten the locking bolt 7 and tighten the adjusting screw 8 with the nut to eliminate the risk of loosening of the adjustment mechanism.

[0038] 3. Assembly of collet 5 and center point 9: Screw center point 9 into the mounting hole at the tail of collet 5, ensuring that the 60° cone angle positioning surface of center point 9 faces upward. Insert collet 5 into the center hole of base 2, so that its external thread at the tail connects with the internal thread of pull rod 4. Then install end cap 6 to cover the mating area between the outer cone surface of collet 5 and the inner cone hole of upper seat 3.

[0039] 4. Workpiece clamping and machining: Insert the gear shaft 10 into the inner hole of the chuck 5 until the bottom of the gear shaft 10 contacts the conical surface of the center 9 for positioning. Start the machine tool hydraulic cylinder to drive the pull rod 4 downward, causing the chuck 5 to press down and retract along the inner conical hole of the upper seat 3. The gear shaft 10 is radially clamped through the conical surface fit. At this time, the 0.01-0.03mm clearance fit between the inner hole of the chuck 5 and the gear shaft 10 ensures radial positioning accuracy, and the radial runout can be controlled within 0.015mm.

[0040] 5. Quick Changeover Processing: When switching to machining a double gear 11, remove the end cover 6 and locking bolts 7, and replace them with upper seat 3 and chuck 5 that are compatible with the double gear 11 specifications. Repeat the coaxiality adjustment process in step 2, and after re-locking, the double gear 11 can be machined without replacing the entire fixture, greatly improving efficiency.

[0041] The embodiments of this utility model have been described in detail above, but the content described is only a preferred embodiment of this utility model and should not be considered as limiting the scope of implementation of this utility model. All equivalent changes and improvements made in accordance with the claims of this utility model should still fall within the patent coverage of this utility model.

Claims

1. A fine-tuning high-precision gear hobbing fixture, mounted on a gear hobbing machine tool, characterized in that, Includes a base (2), a pull rod (4), a clamp (5), an upper seat (3), and a mounting and adjustment assembly; The upper seat (3) is detachably fixed to the base (2) by means of an installation adjustment component. The upper seat (3) has an installation hole at the top and the chuck (5) is located in the installation hole. The top of the chuck (5) has an inner hole for clamping the workpiece. The base (2) is connected to the flange (1) of the gear shaping machine tool. The base (2) has a through inner hole. The pull rod (4) passes through the inner hole and is connected to the drive end of the gear shaping machine tool. The tail of the chuck (5) is threaded to the shaft end of the pull rod (4).

2. The fine-tuning high-precision gear-shaping fixture as described in claim 1, characterized in that, The base (2) has a stepped hole at the top, and the upper seat (3) has a boss structure at the bottom that fits with the stepped hole.

3. A fine-tuning high-precision gear-shaping fixture as described in claim 2, characterized in that, The clearance between the outer circle of the bottom boss of the upper seat (3) and the stepped hole of the base (2) is 0.05mm.

4. A fine-tuning high-precision gear-shaping fixture as described in claim 2 or 3, characterized in that, The installation adjustment assembly includes adjusting screws (8) and locking bolts (7). There are multiple adjusting screws (8), which are arranged circumferentially around the stepped hole at the top of the base (2). The locking bolts (7) are located between the base (2) and the upper seat (3).

5. A fine-tuning high-precision gear-shaping fixture as described in claim 4, characterized in that, The adjusting screws (8) are evenly distributed around the stepped hole at the top of the base (2) and there are no fewer than 3 of them.

6. A fine-tuning high-precision gear-shaping fixture as described in claim 1, characterized in that, The upper seat (3) is a detachable split structure. The top of the mounting hole is an inner conical hole. The outer surface of the chuck (5) is provided with an outer conical surface. The taper of the inner conical hole is adapted to the outer conical surface of different models of chucks (5).

7. A fine-tuning high-precision gear-shaping fixture as described in claim 1, characterized in that, It also includes an end cap (6), which is fixed to the end face of the upper seat (3) by bolts.

8. A fine-tuning high-precision gear-shaping fixture as described in claim 1, characterized in that, It also includes a tip (9), and the tail of the chuck (5) is provided with a tip (9) mounting hole. The tip (9) is fixed in the tip (9) mounting hole by threads and is located at the bottom of the workpiece.

9. A fine-tuning high-precision gear-shaping fixture as described in claim 8, characterized in that, The tip (9) has a 60° cone-shaped positioning surface at its front end.

10. A fine-tuning high-precision gear-shaping fixture as described in claim 1, characterized in that, The upper inner hole of the chuck (5) is clearance-fitted with the workpiece clamping surface, with a clearance of 0.01-0.03 mm.

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