Special alignment tool and method for machining of worm gear hobbing machine

Abstract

The invention provides a special alignment tool and method for worm gear hobbing machine machining, the special alignment tool comprises a pressing plate, the pressing plate is used for being installed in a T-shaped groove of a gear hobbing machine table top, and a pressing plate threaded hole is machined in the pressing plate; a top plate is further included, a positioning boss used for being matched with the T-shaped groove is machined on the bottom end face of the top plate, a lug plate is arranged on one side of the top plate, an adjusting threaded hole is machined in the position where the lug plate is located, an adjusting bolt is installed in the position where the adjusting threaded hole is located in a threaded fit mode, and a penetrating through hole is machined in the top plate. The pressing plate and the top plate are fixedly connected through locking bolts penetrating through the through holes and the threaded holes of the pressing plate. A special tool is utilized, a traditional alignment method is improved, the reference of the worm gear is accurately aligned to be coaxial with the axis of the workbench by 0.005 mm, the manual alignment efficiency is improved, and the machining precision is controlled.

Description

Technical Field

[0001] This invention relates to the field of gear processing equipment technology, specifically to a special alignment fixture and method for worm gear hobbing. Background Technology

[0002] Current Situation and Problem Description: The Y546 worm gear hobbing machine is our company's largest and most critical piece of equipment, a machine tool for processing indexing worm gears. When processing large indexing worm gears, the total tonnage of the machining fixture and the workpiece can reach nearly 10 tons. Previously, the traditional method of aligning the workpiece with the rotation center of the worktable was used: directly striking the outer circumference of the workpiece with a large copper rod based on experience and perceived force, forcing the fixture and workpiece to move until they were nearly coaxial with the worktable axis. This method has the following problems: ① It is difficult to control the magnitude of the impact force and the desired direction of workpiece movement; too much or too little force will not work, and the impact point must be correct; ② The vibration during impact can cause errors or damage to the dial indicator or micrometer used to detect displacement, prolonging the alignment time; ③ Alignment requires two people to assist, one to hold the copper rod steady and the other to strike it, consuming manpower; ④ It is extremely unfriendly to the precision machining and standardized operation of core components. Summary of the Invention

[0003] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a special alignment fixture and method for worm gear hobbing. By using the special fixture, the traditional alignment method is improved, and the worm gear reference is accurately aligned to be coaxial with the worktable axis by 0.005mm, thereby improving the efficiency of manual alignment and controlling the machining accuracy.

[0004] To achieve the above-mentioned technical features, the purpose of this invention is as follows: a special alignment fixture for worm gear hobbing machine processing, including a pressure plate, the pressure plate being installed in a T-slot on the table of the hobbing machine, and the pressure plate having a pressure plate threaded hole. It also includes a top plate, the bottom end face of which is machined with a positioning boss for cooperating with a T-slot, one side of which is provided with an ear plate, and an adjustment threaded hole is machined at the location of the ear plate. An adjustment bolt is installed at the location of the adjustment threaded hole through the thread. A through hole is machined on the top plate. The pressure plate and the top plate are fixedly connected by locking bolts that pass through the through hole and the threaded hole of the pressure plate.

[0005] Preferably, the size of the pressure plate is smaller than the size of the bottom groove of the T-slot.

[0006] Preferably, the pressure plate and top plate are arranged in four groups and are evenly distributed in a circular pattern on the T-slot of the gear hobbing machine table.

[0007] Preferably, a washer is provided at the part where the locking bolt mates with the top plate.

[0008] Preferably, the adjusting bolt is machined with standard fine thread.

[0009] Preferably, the head end face of the adjusting bolt is used to press against the outer wall of the fixture.

[0010] Preferably, a steel ball is movably mounted on the end of the adjusting bolt.

[0011] Another aspect of the present invention provides a dedicated alignment method for worm gear hobbing, the method being implemented using the dedicated alignment fixture and comprising the following steps: Step 1, Installation of the pressure plate: Install the pressure plate into the T-slot on the gear hobbing machine table; Step 2, Installation of the top plate: Place the top plate in the T-slot, aligning the through hole in the middle of the top plate with the threaded hole of the pressure plate. Insert the locking bolt into the through hole and the threaded hole of the pressure plate and connect them through the thread, without locking. Step 3, Adjusting the position of the top plate: Move the top plate and pressure plate until they are close to the jig, then lock the pressure plate. Step 4, Installing the adjusting bolts: Screw the adjusting bolt into the adjusting threaded hole on the side of the top plate; Step 5, Adjusting the position of the fixture: The gear hobbing machine's worktable rotates, and the worm gear's inner hole is aligned using a dial indicator. Based on the dial indicator results, the adjusting bolts are finely adjusted until the worm gear reference and the worktable's axis of rotation runout is within 0.005mm, thus meeting the alignment requirements. The fixture is then locked to prepare for the precision hobbing of the worm gear teeth.

[0012] The present invention has the following beneficial effects: 1. The purpose of this invention is to replace the traditional method of aligning workpieces by hammering with a special alignment fixture, thereby avoiding damage to the workpieces and testing instruments caused by hammering vibration. The fine-thread screw adjustment can easily control the movement distance and direction of the workpiece, standardize the precision machining and operation of core parts, reduce the difficulty of alignment, and improve the alignment efficiency.

[0013] 2. With the use of a dedicated alignment fixture, the distance and direction of the workpiece's radial movement can be precisely controlled, significantly improving the workpiece alignment efficiency and greatly reducing labor intensity.

[0014] 3. By adopting the above-mentioned dimensional matching, it is ensured that the pressure plate can be smoothly installed into the bottom slide of the T-slot.

[0015] 4. By adopting a four-group structure, the fixture can be adjusted in four directions.

[0016] 5. The use of shims ensures the reliability and stability of the connection between the locking bolts and the pressure plate.

[0017] 6. By using standard fine-pitch threads to adjust the displacement of the fixture and the workpiece, it transforms the radial rotational motion around the screw's central axis into axial linear motion, directly pushing the workpiece to move radially or achieving positioning.

[0018] 7. Its small helix angle allows for easy and effortless jacking of the positioning fixture and workpiece to achieve controllable radial displacement in a preset direction. This is beneficial for achieving the minute, controllable movements required for fine alignment.

[0019] 8. The use of steel balls ensures that the subsequent adjusting bolts can rotate smoothly, thereby providing radial thrust and enabling the movement of the jig. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a three-dimensional structural diagram of the top plate of the present invention.

[0022] Figure 2 This is a three-dimensional structural diagram of the pressure plate of the present invention.

[0023] Figure 3 This is a three-dimensional diagram of the overall structure of the device of the present invention.

[0024] Figure 4 This is a partial three-dimensional diagram illustrating the specific working process of this invention.

[0025] Figure 5 This is a top view showing the specific working process of this invention.

[0026] In the diagram: Ear plate 1, Adjusting bolt 2, Adjusting threaded hole 3, Standard fine thread 4, Positioning boss 5, Top plate 6, Through hole 7, Pressure plate 8, Pressure plate threaded hole 9, T-slot 10, Gear hobbing machine table 11, Shim 12, Locking bolt 13, Fixture 14, Steel ball 15. Detailed Implementation

[0027] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0028] Example 1: See Figure 1-5A specialized alignment fixture for worm gear hobbing machines includes a pressure plate 8, which is installed in a T-slot 10 on the hobbing machine table 11. The pressure plate 8 has threaded holes 9 machined into it. It also includes a top plate 6, with a positioning boss 5 machined on its bottom surface to mate with the T-slot 10. An ear plate 1 is provided on one side of the top plate 6, with an adjusting threaded hole 3 machined at its location. An adjusting bolt 2 is threadedly installed at the location of the adjusting threaded hole 3. A through hole 7 is machined on the top plate 6. The pressure plate 8 and the top plate 6 are fixedly connected by a locking bolt 13 passing through the through hole 7 and the threaded hole 9. This alignment fixture allows for precise control of the radial movement distance and direction of the workpiece, avoiding safety hazards caused by the operator standing on a high platform and forcefully impacting the workpiece. Although the T-slot width varies among worm gear hobbing machines, this design concept is applicable to other indexing worm gear hobbing machines using disc-type fixtures. This solution significantly improves workpiece alignment efficiency, greatly reduces labor intensity, simplifies processing, ensures stable and precise assembly positioning, and enhances production efficiency.

[0029] Furthermore, the size of the pressure plate 8 is smaller than the size of the bottom groove of the T-slot 10. By adopting the above-mentioned dimensional matching, it is ensured that the pressure plate 8 can be smoothly installed into the bottom groove of the T-slot 10.

[0030] Furthermore, the pressure plate 8 and the top plate 6 are arranged in four sets, evenly distributed in a circular pattern on the T-slot 10 of the gear hobbing machine table 11. By adopting a four-set structure, it is ensured that the fixture 14 can be adjusted in four directions.

[0031] Furthermore, a washer 12 is provided at the part where the locking bolt 13 mates with the top plate 6. The washer 12 ensures the reliability and stability of the connection between the locking bolt 13 and the pressure plate 8.

[0032] Furthermore, the adjusting bolt 2 is machined with a standard fine thread 4. By using the standard fine thread 4 to adjust the displacement of the fixture and the workpiece, it transforms the radial rotational motion around the central axis of the screw into axial linear motion, directly pushing the workpiece to move radially or achieving positioning.

[0033] Furthermore, the head end face of the adjusting bolt 2 is used to press against the outer wall of the fixture 14. This engagement ensures that the position of the fixture 14 can be adjusted subsequently using the adjusting bolt 2. Its small helix angle allows for easy and effortless movement of the positioning fixture and workpiece towards a predetermined direction, achieving controllable radial displacement. This facilitates the precise, controllable movement required for fine alignment.

[0034] Furthermore, a steel ball 15 is movably installed at the end of the adjusting bolt 2. The use of the steel ball 15 ensures that the adjusting bolt 2 can rotate smoothly, thereby providing radial thrust and realizing the movement of the fixture.

[0035] Example 2: A dedicated alignment method for worm gear hobbing, the method employing the aforementioned dedicated alignment fixture, includes the following steps: Step 1, Installation of pressure plate 8: Install the pressure plate 8 into the T-slot 10 of the gear hobbing machine table 11; Step 2, Installation of Top Plate 6: Place the top plate 6 in the T-slot 10, align the through hole 7 in the middle of the top plate 6 with the threaded hole 9 of the pressure plate 8, insert the locking bolt 13 into the through hole 7 and the threaded hole 9 of the pressure plate 8 and connect them by thread, without locking. Step 3, Adjusting the position of top plate 6: Move the top plate 6 and the pressure plate 8 until they are close to the jig 14, then lock the pressure plate. Step 4, Installation of adjusting bolt 2: Screw the adjusting bolt 2 into the adjusting threaded hole 3 on the side of the top plate 6; Step 5, position adjustment of fixture 14: The gear hobbing machine's worktable rotates, and the worm gear's inner hole is aligned using a dial indicator. Based on the dial indicator results, the adjusting bolt 2 is finely adjusted until the worm gear reference and the worktable's axis of rotation run out within 0.005mm, thus meeting the alignment requirements. The fixture is then locked to prepare for the precision hobbing of the worm gear teeth.

[0036] The specific working process and principle of this invention are as follows: 1. Install the pressure plate 8 into the T-slot 10 of the gear hobbing machine table 11; 2. Place the top plate 6 in the T-slot 10, align the through hole 7 in the middle of the top plate 6 with the threaded hole 9 of the pressure plate 8, insert the locking bolt 13 into the through hole 7 and the threaded hole 9 of the pressure plate 8 and connect them by thread, without locking. 3. Move the top plate 6 and the pressure plate 8 until they are close to the jig 14 and then lock the pressure plate. At the same time, screw the adjusting bolt 2 into the adjusting threaded hole 3 on the side of the top plate 6. 4. The gear hobbing machine's worktable rotates, and the worm gear's inner hole is aligned using a dial indicator. Based on the dial indicator results, the adjusting bolt 2 is finely adjusted until the worm gear reference and the worktable's axis of rotation runout is within 0.005mm, thus meeting the alignment requirements. The fixture is then locked to prepare for the precision hobbing of the worm gear teeth.

[0037] Advantages of this invention: Its advantages are as follows: ① The main motion control component of this fixture uses M16X1.5 standard fine-pitch hexagonal socket screws, which have a small helix angle, allowing for easy and effortless jacking of the positioning fixture and workpiece to achieve controllable radial displacement in a preset direction. This is beneficial for achieving the micro-controllable movement required for fine alignment. ② Since the displacement of the fixture and workpiece is adjusted by rotating the M16X1.5 standard fine-pitch hexagonal socket screws, it transforms the radial rotational motion around the screw's central axis into axial linear motion, directly pushing the workpiece to move radially or achieve positioning. Therefore, it avoids the impact vibration caused by the direct impact of the copper rod on the workpiece. Consequently, it will not affect precision measuring instruments that detect movement, such as dial indicators or micrometers, causing vibration that could lead to indication errors and damage. ③ The fixture has a low design height, allowing the M16X1.5 standard fine-pitch hexagonal socket screws to directly abut against the 40mm high outer circle of the fixture's lower end face, avoiding interference from the high-positioned inclined ribs of the fixture. In addition, the point of action of the M16X1.5 standard fine-thread internal hexagon screw is also designed to be offset from the symmetrical central axis of the tooling's own positioning boss. When the tooling's positioning boss and the fixture's U-shaped fastening groove share a T-slot on the worktable, they will not interfere with each other.

Claims

1. A special alignment fixture for worm gear hobbing, characterized in that, Includes a pressure plate (8), which is used to install in the T-slot (10) of the gear hobbing machine table (11), and the pressure plate (8) has a pressure plate thread hole (9). It also includes a top plate (6), the bottom end face of the top plate (6) is machined with a positioning boss (5) for cooperating with the T-slot (10), one side of the top plate (6) is provided with an ear plate (1), an adjustment thread hole (3) is machined at the location of the ear plate (1), an adjustment bolt (2) is installed at the location of the adjustment thread hole (3) by thread engagement, and a through hole (7) is machined on the top plate (6); The pressure plate (8) and the top plate (6) are fixedly connected by locking bolts (13) passing through the through hole (7) and the threaded hole (9) of the pressure plate.

2. The special alignment fixture for worm gear hobbing as described in claim 1, characterized in that: The size of the pressure plate (8) is smaller than the size of the bottom groove of the T-slot (10).

3. The special alignment fixture for worm gear hobbing as described in claim 1, characterized in that: The pressure plate (8) and the top plate (6) are arranged in four groups and are evenly distributed in a circle on the T-slot (10) of the gear hobbing machine table (11).

4. The special alignment fixture for worm gear hobbing as described in claim 1, characterized in that: A washer (12) is provided at the part where the locking bolt (13) mates with the top plate (6).

5. The special alignment fixture for worm gear hobbing as described in claim 1, characterized in that: The adjusting bolt (2) is machined with a standard fine thread (4).

6. The special alignment fixture for worm gear hobbing as described in claim 1, characterized in that: The head end face of the adjusting bolt (2) is used to tighten the outer wall of the fixture (14).

7. The special alignment fixture for worm gear hobbing as described in claim 1, characterized in that: A steel ball (15) is movably installed at the end of the adjusting bolt (2).

8. A dedicated alignment method for worm gear hobbing, characterized in that, The method is implemented using the dedicated alignment fixture described in any one of claims 1-7, and includes the following steps: Step 1, Installation of pressure plate (8): Install the pressure plate (8) into the T-slot (10) of the gear hobbing machine table (11); Step 2, Installation of the top plate (6): Place the top plate (6) in the T-slot (10), align the through hole (7) in the middle of the top plate (6) with the threaded hole (9) of the pressure plate (8), insert the locking bolt (13) into the through hole (7) and the threaded hole (9) of the pressure plate (8) and connect them by thread without locking; Step 3, Adjusting the position of the top plate (6): Move the top plate (6) and the pressure plate (8) until they are close to the jig (14), then lock the pressure plate. Step 4, Installation of adjusting bolt (2): Screw in the adjusting bolt (2) inside the adjusting threaded hole (3) on the side of the top plate (6); Step 5, position adjustment of the fixture (14): The hobbing machine table rotates, the inner hole of the worm gear is aligned using a dial indicator, and the adjusting bolt (2) is finely adjusted according to the dial indicator result until the worm gear reference and the axis of the worktable runout is within 0.005mm, thus meeting the alignment requirements. The fixture is then locked to prepare for precision hobbing of the worm gear teeth.

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