Bevel gear chuck

Abstract

The utility model discloses a bevel gear chuck relates to bevel gear field, including the connecting flange, chuck cover, pull rod, inclined pull rod and inclined pressure plate, through the cooperation of the tooth mould support, inclined pull rod and inclined pressure plate of installation, and further clamping workpiece realizes the positioning to reach the fixed effect to workpiece, has improved the practicality of jig whole, through the tension of machine tool control pull rod, through the tension of pull rod to inclined pull rod and inclined pressure plate, and further control inclined pressure plate pressure fixed to workpiece, when the main shaft speed exceeds critical value, and the inclined pressure plate is contacted extrusion with workpiece outside, and is pressed in workpiece outside, when centrifugal force is generated, and the centrifugal force is limited to workpiece under the clamping of inclined pressure plate, and simultaneously cooperate tooth mould support conical setting and workpiece adhesion cooperation, and the centrifugal force is converted into the pressure between workpiece and tooth mould support conical contact part, and is converted into the additional pressure of workpiece.

Description

Technical Field

[0001] This utility model relates to the field of bevel gears, and in particular to a bevel gear chuck. Background Technology

[0002] When machining bevel gears, a bevel gear chuck is needed to clamp the bevel gears.

[0003] However, current bevel gear chuck technology faces three major technical bottlenecks, which severely restrict the processing efficiency and quality of high-end gears: In static clamping mode, traditional chucks that rely on manual preload have significant accuracy drift issues; When the spindle speed exceeds the critical value (usually 1200 rpm), the centrifugal force effect is significant. The moving parts in the traditional clamping mechanism will generate centrifugal force, which will cause the effective clamping force on the workpiece to decrease nonlinearly, resulting in workpiece loosening or chattering, which seriously affects the quality of the machined surface and poses safety hazards.

[0004] The wear rate of cast iron rack friction pairs is as high as 0.15 mm³ / (N·m) under dry cutting conditions, which not only shortens the life of the fixture, but also affects the consistency of product quality due to the deterioration of precision caused by wear.

[0005] Chinese patent CN222931847U discloses a centrifugal-assisted clamping mechanism belonging to the field of bevel gear processing technology. It includes a chuck with a fixing shaft on one side and a first groove on the other side. A tip for fixing a spiral bevel gear is located at the center of the bottom of the first groove. Multiple clamping components arranged in a ring are located on the side of the chuck outside the first groove. Each clamping component is connected to the chuck via a fixing component. Each clamping component includes a clamping block, the narrow part of which extends towards the center of the chuck. Racks are provided on the opposite sides of the clamping blocks. The high-speed rotation of the chuck causes the clamping blocks to generate centrifugal force to clamp the spiral bevel gear. The racks on the sides of the clamping blocks clamping the spiral bevel gear increase friction and thus increase the clamping force. Increased rotation speed leads to increased centrifugal force and a greater clamping force on the spiral bevel gear.

[0006] This solution introduces centrifugal assisted clamping, but it fails to achieve coordinated control of dynamic clamping force and positioning accuracy. Its compensation mechanism is passive and cannot be adjusted according to the actual state of the workpiece.

[0007] Therefore, we propose a bevel gear chuck to solve the above problems. Utility Model Content

[0008] The purpose of this invention is to provide a bevel gear chuck to solve the problems mentioned in the background art.

[0009] To achieve the above objectives, this utility model provides the following technical solution: a bevel gear chuck, comprising a connecting flange and a chuck cover disposed on one side of the connecting flange, a pull rod provided between the connecting flange and the chuck cover, the pull rod being inserted into the connecting flange, one end of the pull rod passing through the connecting flange and connected to the output end of the machine tool, a diagonal pull rod being inserted at the step of the pull rod, the diagonal pull rod being slidably connected to the chuck cover, one end of the diagonal pull rod passing through the chuck cover and extending outward, and a diagonal pressure plate being installed at this end; A toothed mold support is inserted into one side of the chuck cover, and the other side of the toothed mold support is used to fit the calibration piece. The outer wall of the calibration piece is fitted with the inclined end of the inclined pressure plate. The outer wall of the connecting flange is threaded with an internally threaded cylindrical pin. The cylindrical part of the internally threaded cylindrical pin is inserted into the tie rod to achieve the connection between the tie rod and the connecting flange.

[0010] Preferably, the chuck cover is fixedly connected to the connecting flange by a second hexagon head screw and a third hexagon head screw.

[0011] Preferably, the chuck cover is threaded with an anti-rotation screw, the end of which is inserted into the limiting groove of the diagonal tie rod, and the diagonal tie rod can slide along the anti-rotation screw through the limiting groove.

[0012] Preferably, a straight-through pressure injection cup is installed on the chuck cover, and the injection port of the straight-through pressure injection cup is in contact with the outer surface of the tie rod.

[0013] Preferably, the outer wall of the tooth mold support is fitted with an internal hexagonal cylindrical end set screw, one end of which penetrates the tooth mold support and is installed into the chuck cover.

[0014] Preferably, the diagonal tie rod and the diagonal pressure plate are connected by a first internal hexagon head screw.

[0015] Preferably, a standard spring washer is provided at the connection between the first internal hexagonal head screw and the inclined pressure plate.

[0016] Preferably, the mating end of the tooth mold support and the calibration component is tapered.

[0017] The technical effects and advantages of this utility model are as follows: 1. By installing the toothed mold support, diagonal tie rod and diagonal pressure plate, the workpiece is clamped and positioned, thereby fixing the workpiece. Since the diagonal pressure plate contacts and squeezes the outside of the workpiece, it can clamp workpieces with different inner diameters, improving the overall practicality of the fixture.

[0018] 2. A dynamic centrifugal force compensation mechanism was designed. The tension of the tie rod is controlled by the machine tool, and the tie rod applies tension to the inclined tie rod and the inclined pressure plate, thereby controlling the pressure of the inclined pressure plate on the workpiece. When the spindle speed exceeds the critical value, the centrifugal force effect is significant. Due to the contact and compression between the inclined pressure plate and the outside of the workpiece, the inclined pressure is on the outside of the workpiece. When centrifugal force is generated, the centrifugal force is constrained by the clamping of the inclined pressure plate. At the same time, with the conical setting of the tooth mold support fitting closely to the workpiece, the centrifugal force is converted into the pressure between the workpiece and the conical contact part of the tooth mold support, which is converted into an additional clamping force on the workpiece.

[0019] 3. By combining the inclined plane force-increasing mechanism composed of inclined tie rods and inclined pressure plates with the conical positioning of the tooth mold support, automatic centering and flexible clamping of the workpiece are achieved. This eliminates radial drift caused by uneven manual preload from a mechanistic perspective, and stably controls the initial positioning accuracy of the workpiece within 0.01mm, fundamentally solving the problem of static accuracy drift. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0021] In the diagram: 1. Connecting flange; 2. Chuck cover; 3. Anti-rotation screw; 4. Straight-through pressure injection cup; 5. Diagonal tie rod; 6. Diagonal pressure plate; 7. First socket head cap screw; 8. Standard spring washer; 9. Gear mold support; 10. Socket head cap set screw; 11. Second socket head cap screw; 12. Third socket head cap screw; 13. Tie rod; 14. Internally threaded cylindrical pin; 15. Calibration piece. Detailed Implementation

[0022] 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] This utility model provides, for example Figure 1 The bevel gear chuck shown includes a connecting flange 1 and a chuck cover 2 disposed on one side of the connecting flange 1. A tie rod 13 is provided between the connecting flange 1 and the chuck cover 2. The tie rod 13 is inserted into the connecting flange 1. A diagonal tie rod 5 is inserted into the step of the tie rod 13. The diagonal tie rod 5 is slidably connected to the chuck cover 2. One end of the diagonal tie rod 5 passes through the chuck cover 2 and extends outward, and a diagonal pressure plate 6 is installed at this end. A toothed mold support 9 is inserted into one side of the chuck cover 2, and the other side of the toothed mold support 9 is used to fit the calibration piece 15. The outer wall of the calibration piece 15 is fitted with the inclined end of the inclined pressure plate 6. The outer wall of the connecting flange 1 is threaded with an internally threaded cylindrical pin 14. The cylindrical part of the internally threaded cylindrical pin 14 is inserted into the tie rod 13 to realize the connection between the tie rod 13 and the connecting flange 1.

[0024] First, the tie rod 13 is connected to the connecting flange 1 using the internally threaded cylindrical pin 14; Secondly, the relative position and orientation between the tie rod 13 and the connecting flange 1 are ensured by the internal threaded cylindrical pin 14. Meanwhile, the threaded cylindrical pin 14 can be used as a locating pin to keep the tie rod 13 and the connecting flange 1 in accurate alignment.

[0025] Before use, the machine tool provides tension to the pull rod 13. Under the tension of the pull rod 13, the inclined pull rod 5 inserted at the step of the pull rod 13 is moved. At this time, the inclined pull rod 5 slides along the chuck cover 2, which drives the inclined pressure plate 6 to move accordingly. When the inclined pressure plate 6 moves, the inclined end of the inclined pressure plate 6 is pressed against the calibration piece 15, clamping the calibration piece 15 at the tooth mold support 9 for calibration before processing. The position of the inclined pressure plate 6 is finely adjusted to ensure the clamping accuracy.

[0026] The machine tool provides a pulling force to the tie rod 13. Under the pulling force of the tie rod 13, the inclined tie rod 5 inserted at the step of the tie rod 13 is pulled to move. At this time, the inclined tie rod 5 slides along the chuck cover 2, which drives the inclined pressure plate 6 to move accordingly. When the inclined pressure plate 6 moves, the inclined end of the inclined pressure plate 6 is squeezed against the workpiece, and the workpiece is clamped at the tooth mold support 9. When the pull rod 13 moves, it causes the diagonal pull rod 5 to move. At this time, the diagonal pull rod 5 can slide along the step of the pull rod 13. By transferring the tension to the inside of the fixture, clamping the calibration piece 15 and pressing the end face, the overall practicality and rigidity of the fixture can be improved.

[0027] The workpiece is clamped and positioned by the installation of the toothed mold support 9, the diagonal tie rod 5 and the inclined pressure plate 6, thereby fixing the workpiece. Since the inclined pressure plate 6 contacts and squeezes the outside of the workpiece, it can clamp workpieces with different inner diameters, thus improving the overall practicality of the fixture.

[0028] A dynamic centrifugal force compensation mechanism was designed. The tension of the tie rod 13 is controlled by the machine tool. The tie rod 13 applies tension to the inclined tie rod 5 and the inclined pressure plate 6, thereby controlling the pressure of the inclined pressure plate 6 on the workpiece to fix it. When the spindle speed exceeds the critical value, usually 1200 rpm, the centrifugal force effect is significant. Due to the contact and compression between the inclined pressure plate 6 and the outside of the workpiece, the inclined pressure plate 6 clamps the workpiece and restricts it. At the same time, the conical setting of the tooth mold support 9 fits and cooperates with the calibration part 15. The centrifugal force is converted into the pressure between the calibration part 15 and the conical contact part of the tooth mold support 9, which is converted into an additional clamping force on the calibration part 15.

[0029] The chuck cover 2 is fixedly connected to the connecting flange 1 by the second hexagon socket head cap screw 11 and the third hexagon socket head cap screw 12.

[0030] Example 1: The chuck cover 2 is threaded with an anti-rotation screw 3. The end of the anti-rotation screw 3 is inserted into the limiting groove of the diagonal tie rod 5. The diagonal tie rod 5 can slide along the anti-rotation screw 3 through the limiting groove. The anti-rotation screw 3 is used to limit the circumferential rotation of the diagonal tie rod 5.

[0031] A straight-through pressure oil cup 4 is installed on the chuck cover 2, and the oil inlet of the straight-through pressure oil cup 4 is in contact with the outer surface of the tie rod 5.

[0032] Oil is injected into the diagonal tie rod 5 through the straight-through pressure oil cup 4 to lubricate the diagonal tie rod 5, so that the diagonal tie rod 5 can move under the action of the tie rod 13.

[0033] Example 2: A hexagonal socket head cap screw 10 is installed on the outer wall of the tooth mold support 9. One end of the hexagonal socket head cap screw 10 passes through the tooth mold support 9 and is installed into the chuck cover 2.

[0034] By rotating the internal hexagonal set screw 10 to install it onto the chuck cover 2, the toothed mold support 9 is tightly fitted onto the chuck cover 2 by the pushing force of the internal hexagonal set screw 10 on the toothed mold support 9, thereby fixing the toothed mold support 9 to the outer wall of the chuck cover 2.

[0035] The tie rod 5 and the pressure plate 6 are connected by the first internal hexagon head screw 7.

[0036] A standard spring washer 8 is provided at the connection between the first internal hex socket head cap screw 7 and the inclined pressure plate 6. The standard spring washer 8 is used to provide elastic preload to prevent loosening.

[0037] The mating end of the tooth mold support 9 and the calibration piece 15 is set to be tapered.

[0038] The toothed mold support 9 is tapered to facilitate fitting and cooperating with the calibration piece 15, and under compression, the calibration piece 15 is centered.

[0039] By combining the inclined force-increasing mechanism consisting of the inclined tie rod 5 and the inclined pressure plate 6 with the conical positioning of the tooth mold support 9, automatic centering and flexible clamping of the workpiece are achieved. This eliminates radial drift caused by uneven manual pre-tightening force from a mechanistic perspective, and stably controls the initial positioning accuracy of the workpiece within 0.01mm, fundamentally solving the problem of static accuracy drift.

[0040] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A bevel gear chuck, characterized in that, Includes a connecting flange (1) and a chuck cover (2) disposed on one side of the connecting flange (1). A tie rod (13) is provided between the connecting flange (1) and the chuck cover (2). The tie rod (13) is inserted into the connecting flange (1). One end of the tie rod (13) passes through the connecting flange (1) and is connected to the output end of the machine tool. A diagonal tie rod (5) is inserted at the step of the tie rod (13). The diagonal tie rod (5) is slidably connected to the chuck cover (2). One end of the diagonal tie rod (5) passes through the chuck cover (2) and extends outward. A diagonal pressure plate (6) is installed at this end. A toothed mold support (9) is inserted into one side of the chuck cover (2), and the other side of the toothed mold support (9) is used to fit the calibration piece (15). The outer wall of the calibration piece (15) is fitted with the inclined end of the inclined pressure plate (6). The outer wall of the connecting flange (1) is threaded with an internal thread cylindrical pin (14), and the cylindrical pin portion of the internal thread cylindrical pin (14) is inserted into the tie rod (13) to realize the connection between the tie rod (13) and the connecting flange (1).

2. The bevel gear chuck according to claim 1, characterized in that, The chuck cover (2) is fixedly connected to the connecting flange (1) by a second hexagon socket head cap screw (11) and a third hexagon socket head cap screw (12).

3. A bevel gear chuck according to claim 1, characterized in that, The chuck cover (2) is threaded with an anti-rotation screw (3), the end of which is inserted into the limiting groove of the diagonal rod (5), and the diagonal rod (5) can slide along the anti-rotation screw (3) through the limiting groove.

4. A bevel gear chuck according to claim 1, characterized in that, A straight-through pressure injection cup (4) is installed on the chuck cover (2), and the oil injection port of the straight-through pressure injection cup (4) is in contact with the outer surface of the tie rod (5).

5. A bevel gear chuck according to claim 1, characterized in that, The outer wall of the tooth mold support (9) is fitted with an internal hexagonal cylindrical end set screw (10), one end of which passes through the tooth mold support (9) and is installed into the chuck cover (2).

6. A bevel gear chuck according to claim 1, characterized in that, The diagonal tie rod (5) and the diagonal pressure plate (6) are connected by a first internal hexagonal head screw (7).

7. A bevel gear chuck according to claim 6, characterized in that, A standard spring washer (8) is provided at the connection between the first internal hexagonal head screw (7) and the inclined pressure plate (6).

8. A bevel gear chuck according to claim 1, characterized in that, The mating end of the tooth mold support (9) and the calibration piece (15) is set to be tapered.

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