Generator assembly machining fixture

Abstract

The present application relates to the field of generator assembly machining positioning, in particular to a kind of generator assembly machining tool clamp.It includes machine table, the upper end of machine table top is rotationally arranged with electric turntable, the upper end of electric turntable is coaxially fixed with tray, and the upper end of tray is provided with flexible bag filled with internal magnetorheological fluid;Tray upper end is arranged with lug positioning mechanism in equiangular array along the circumferential direction, each lug positioning mechanism includes support plate, top pin fixed to the middle part of support plate and positioning pin coaxially slidingly arranged with top pin, and positioning pin and top pin are respectively sleeved with conical rubber sleeve for auxiliary positioning clamping.The present application is combined with magnetorheological fluid full-wrapping support by bidirectional lug positioning, to realize the non-magnetic aluminum alloy end cover high-precision positioning without damage, without processing interference, strong adaptability, suitable for the inner cavity batch processing procedure of generator end cover, solve the problem that the datum of existing generator end cover reverse buckle machining tool does not coincide, workpiece is easy to deform, processing interference and poor positioning stability.

Description

Technical Field

[0001] This invention relates to the field of generator assembly processing and positioning, specifically to a generator assembly processing tooling fixture. Background Technology

[0002] With the rapid iteration of generators for new energy vehicles and high-end equipment towards lightweight, high power density, and low noise, non-magnetic aluminum alloys, with their core advantages of no eddy current loss and good formability, have become the mainstream material for generator end covers. The generator end cover is a cup-shaped thin-walled rotating body structure. The machining accuracy of its internal bearing chamber, oil seal groove, and mounting holes directly determines the generator's transmission coaxiality, operational stability, and service life. Internal cavity machining, as the core process in end cover production, requires the end cover flange flat end to face upwards and the arched end downwards for inverted clamping, providing an unobstructed vertical feed path for the cutting tool. This clamping state places extremely high demands on the positioning accuracy, clamping rigidity, anti-deformation capability, and interference-free design of the tooling fixtures.

[0003] Currently, the industry mainstream tooling for machining undercut end caps is based on rigid contact structures, which suffers from several inherent and unavoidable defects. Firstly, existing machining fixtures, when facing undercut end caps, rely on the arched cast blank surface of the end cap for rigid positioning and support. This completely deviates from the design datum of the end cap flange plane and stop, resulting in an unavoidable datum misalignment error. This makes it impossible to guarantee core geometric tolerances such as coaxiality and perpendicularity between the inner cavity and the stop, leading to extremely poor consistency in batch processing. Secondly, existing clamping fixtures are prone to causing irreversible damage to the workpiece. Non-magnetic thin-walled aluminum alloy parts have weak rigidity, and the conventional three-jaw chuck radial clamping method easily causes elliptical deformation of the workpiece. After machining, the release of clamping force results in springback, causing dimensional and geometric tolerances to exceed limits. In addition, because the internal parts of the workpiece need to be machined, the axial clamping scheme of some existing fixtures will directly block the tool feed path, making it impossible to complete the full process of internal cavity machining. Moreover, rigid tooling is mostly a special customized structure, and a single set of tooling can only be adapted to a single model of end cap. When changing products, the entire set of tooling needs to be remade, which results in high changeover costs and long cycles.

[0004] To alleviate the deformation and adaptability issues of rigid contact tooling, non-rigid contact tooling using elastic components such as springs and elastic rubber has gradually emerged in the industry. However, the core problem of undercut machining remains unsolved. While elastic components can accommodate dimensional deviations in arched blanks, they cannot provide stable rigid support. During machining, cutting forces can easily cause workpiece movement, wobble, and chatter, resulting in excessive surface roughness and loss of dimensional accuracy. Furthermore, non-rigid contact tooling still fails to address the core issue of misalignment between the positioning datum and the design datum, making it impossible to guarantee the stability of geometric tolerances at their source. Moreover, elastic components are prone to fatigue failure, leading to a continuous decline in positioning accuracy over long-term use, which cannot meet the high-precision, high-stability, and mass production requirements of non-magnetic aluminum alloy generator end caps. Summary of the Invention

[0005] Therefore, it is necessary to provide a tooling fixture for processing generator components to address the existing technical problems.

[0006] To solve the problems of the prior art, the technical solution adopted by the present invention is as follows:

[0007] A machining fixture for generator components includes a machine tool for machining the workpiece, and further includes:

[0008] The electric turntable is rotated and set at the top of the machine table. A tray is fixedly connected to the upper end of the electric turntable on the same axis. A flexible bag filled with magnetorheological fluid is set at the upper end of the tray. When the workpiece is placed on the upper end of the flexible bag, the flexible bag fills the gap between the flange ribs of the workpiece through the magnetorheological fluid.

[0009] The upper end of the tray is provided with a hanging ear positioning mechanism arranged at equal angles along the circumference. Each hanging ear positioning mechanism includes a tray plate fixedly set above the tray and a top pin fixedly set in the middle of the tray plate. A positioning pin is slidably set on the top pin along the same axis. When the workpiece is placed on the upper end of the flexible bag, the hanging ear holes set in the circumference direction are correspondingly fitted outside each top pin. The positioning pin moves from top to bottom and extends into the corresponding hanging ear hole to cooperate with the top pin to perform bidirectional positioning of the workpiece.

[0010] The locating pin and the top pin are respectively fitted with tapered rubber sleeves. When the locating pin and the top pin position the workpiece, the tapered rubber sleeves are interference-fitted with the inner wall of the lug.

[0011] Furthermore, a rubber ring is coaxially fixed in the middle of the tray to support the lower end of the workpiece.

[0012] Furthermore, the flexible bag is made of a high tear-resistant polyurethane composite film, and the outline of the flexible bag is adapted to the projected outline of the flange reinforcement of the workpiece, so as to completely fill the gap of the flange reinforcement.

[0013] Furthermore, an electromagnetic generating module for generating magnetic force is provided at the upper end of the tray, and a disk is provided at the lower end of the flexible bag. The disk is magnetically connected to the magnetic field output end of the electromagnetic generating module.

[0014] Furthermore, two anchor rods are provided at the upper end of the tray, and the anchor rods correspond to the support shaft holes at the end of the workpiece. The upper end of the anchor rod is formed with a bullet head for the workpiece shaft hole to pass through.

[0015] Furthermore, each ear-mounting mechanism also includes a base frame fixedly connected to the upper end of the tray. Two guide rails are fixedly connected to the upper end of the base frame, and two electric push rods are provided on the side of the two guide rails that are close to each other. The tray is fixedly connected to the base frame.

[0016] A support plate is provided at the upper end of the base frame. The support plate is slidably connected to two guide rails. The output ends of two electric actuators are fixedly connected to the support plate. The positioning pin is slidably set on the side of the support plate away from the electric actuators.

[0017] Furthermore, each ear-mounting mechanism also includes a pneumatic actuator mounted on the upper end of the positioning pin. The fixed end of the pneumatic actuator is fixedly connected to the support plate, and the output end is fixedly connected to the positioning pin.

[0018] Furthermore, a chuck is fixedly connected to the output end of the pneumatic actuator, and a locking pin is slidably connected to the chuck along the circumferential direction. A pressure ring is provided on the side of the chuck near the positioning pin, and the pressure ring is fixedly connected to the lower end of the locking pin.

[0019] Each locking pin is fitted with a spring. One end of the spring is fixed to the pressure ring, and the other end is fixed to the chuck. The end of the locking pin away from the pressure ring is fixed with a nut to prevent the locking pin from moving downwards too much. When the positioning pin is inserted into the lug hole, the pressure ring abuts against the upper end of the lug until the spring is compressed to its limit.

[0020] Furthermore, the end of the pallet closest to the center of the tray is curved.

[0021] Furthermore, an anti-slip pad is fixed to the upper part of the pallet.

[0022] The beneficial effects of this invention compared to the prior art are:

[0023] Firstly, compared to existing technologies, this tooling fixture fundamentally solves the core defects of misalignment between the positioning datum and the design datum, as well as the easy damage and deformation of the workpiece. This solution uses the workpiece's own lug hole as the positioning datum, and uses the top pin and positioning pin for bidirectional coaxial positioning. Combined with the self-centering interference connection of the tapered rubber sleeve, it completely eliminates the positioning gap, locks the core degree of freedom of the workpiece, and ensures that the positioning datum and the workpiece design datum are completely aligned. This avoids the datum error caused by the positioning of the blank surface. At the same time, the flexible contact between the tapered rubber sleeve and the inner wall of the lug hole completely avoids the problems of scratches, deformation, and excessive springback of non-magnetic aluminum alloy thin-walled workpieces caused by rigid clamping, thus improving the dimensional consistency and geometric tolerance control accuracy of batch processing.

[0024] Secondly, this tooling fixture solves the core pain points of existing tooling, such as machining interference, insufficient support rigidity, and poor adaptability. This solution uses a flexible bag filled with magnetorheological fluid to adaptively fill the gaps in the flange ribs. After being magnetized, it instantly solidifies to form a fully enclosed rigid support, which, together with the lug positioning mechanism, forms a dual clamping system for positioning and support, solving problems such as chatter and sway during machining. Furthermore, all positioning mechanisms are arranged on the outer circumference of the workpiece, completely avoiding the machining path of the inner cavity. With the help of an electric turntable, multi-station rotary machining can be achieved without tool interference. The flexible bag can adapt to the flange rib contours of workpieces of different specifications, eliminating the need for customized rigid structures and reducing product changeover costs and cycles. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural diagram of an embodiment;

[0026] Figure 2 This is a three-dimensional structural diagram of the flexible bag and the ear loop positioning mechanism in the embodiment;

[0027] Figure 3 This is a three-dimensional structural diagram of the flexible bag and rubber ring in the embodiment;

[0028] Figure 4 This is a top view of the flexible bag and the ear loop positioning mechanism in the embodiment;

[0029] Figure 5 yes Figure 4 Enlarged view of the structure at point AA;

[0030] Figure 6 yes Figure 5 Enlarged view of the structure at point B in the middle;

[0031] Figure 7 yes Figure 5 Enlarged view of the structure at point C;

[0032] Figure 8 This is a three-dimensional structural diagram of the ear-mounted positioning mechanism in the embodiment;

[0033] Figure 9 yes Figure 8 Enlarged view of the structure at point D.

[0034] The numbers on the map are:

[0035] 1. Machine base; 2. Electric turntable; 3. Tray; 4. Rubber ring; 5. Flexible bag; 6. Disk; 7. Electromagnetic generator module; 8. Anchor bolt; 9. Bullet head; 10. Hanging ear positioning mechanism; 11. Base frame; 12. Electric actuator; 13. Guide rail; 14. Support plate; 15. Pneumatic actuator; 16. Positioning pin; 17. Conical rubber sleeve; 18. Chuck; 19. Locking pin; 20. Spring; 21. Pressure ring; 22. Nut; 23. Support plate; 24. Anti-slip pad; 25. Top pin. Detailed Implementation

[0036] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0037] The workpiece that needs to be clamped and positioned has an inverted bowl-shaped structure. One end is a flat flange face, and the other end is an arched face. The inner side of the flange face is the inner cavity to be machined. The inner cavity contains core machining parts such as bearing chamber, oil seal groove and threaded mounting hole. Its machining accuracy directly determines the operating stability and service life of the generator. During machining, the flange face should be facing up and the arched face should be facing down for clamping, so as to provide the tool with an unobstructed vertical feed path.

[0038] The workpiece has raised flange reinforcing ribs evenly distributed along the circumference on the end face of the arched end, forming irregular gaps between the ribs. The outer ring of the workpiece flange plane end is arrayed with mounting lugs with shaft holes along the circumference. The end of the workpiece is also provided with two positioning feet with support shaft holes. The lug holes and support shaft holes are the design reference parts of the workpiece, and the form and position tolerances and surface quality requirements are strict.

[0039] refer to Figures 1 to 9 A generator assembly machining fixture includes a machine base 1 for machining workpieces, and further includes:

[0040] The electric turntable 2, which is set on the upper part of the table of the machine tool 1, is rotated. The upper part of the electric turntable 2 is coaxially fixed to the tray 3. The upper part of the tray 3 is equipped with a flexible bag 5 filled with magnetorheological fluid. When the workpiece is placed on the upper part of the flexible bag 5, the flexible bag 5 fills the gap of the flange rib of the workpiece through the magnetorheological fluid.

[0041] The upper end of the tray 3 is provided with ear positioning mechanisms 10 arranged at equal angles along the circumference. Each ear positioning mechanism 10 includes a tray plate 23 fixedly installed above the tray 3 and a top pin 25 fixedly installed in the middle of the tray plate 23. A positioning pin 16 is slidably arranged on the top pin 25 along the same axis. When the workpiece is placed on the upper end of the flexible bag 5, the ear holes arranged in the circumference direction are correspondingly fitted outside each top pin 25. The positioning pin 16 moves from top to bottom and extends into the corresponding ear hole to cooperate with the top pin 25 to perform bidirectional positioning of the workpiece.

[0042] The positioning pin 16 and the top pin 25 are respectively fitted with tapered rubber sleeves 17. When the positioning pin 16 and the top pin 25 position the workpiece, the tapered rubber sleeves 17 are interference-fitted with the inner wall of the lug.

[0043] When the device is running and in the initial state of the tooling, the magnetorheological fluid in the flexible bag 5 is in a freely flowing fluid state, and the positioning pins 16 of each lug positioning mechanism 10 are all in the upward避让 position. At this time, when the operator places the generator end cover workpiece in the inverted state on the upper end of the flexible bag 5, the flange ribs facing downwards of the workpiece are in full contact with the flexible bag 5, and the fluid magnetorheological fluid adapts to the deformation along the special-shaped contour of the flange ribs, filling the gaps of all flange ribs without gaps, and simultaneously completing the preliminary support of the workpiece in the axial direction. At the same time, the lug holes in the circumferential direction of the workpiece are accurately sleeved on the upper ends of the top pins 25. Through the cooperation of the top pins 25 and the lug holes, the core degrees of freedom of the horizontal translation and circumferential rotation of the workpiece are restricted, the pre-positioning of the workpiece is completed, and a unified benchmark is provided for the subsequent accurate two-way positioning, avoiding position deviation in subsequent operations.

[0044] After the pre-positioning is completed, the positioning pins 16 of each lug positioning mechanism 10 slide synchronously from top to bottom along the same axis of the top pins 25 and accurately extend into the corresponding lug holes, forming a positioning structure with the top pins 25 fixed below in a top-to-top manner in the up and down directions. At the same time, the conical rubber sleeves 17 outside the positioning pins 16 and the top pins 25 form an interference connection with the inner wall of the lug holes during the insertion action. Both the self-centering effect of the conical structure completely eliminates the fitting clearance between the pin body and the lug holes, realizing the complete locking of the axial movement freedom of the workpiece, and the flexible contact of the elastic rubber sleeve avoids scratching and deformation of the lug holes of the non-magnetic aluminum alloy workpiece caused by rigid positioning. At the same time, the circumferential limiting effect is further strengthened, completely locking the reference position of the workpiece, ensuring that the workpiece will not displace during the subsequent curing process of the magnetorheological fluid, and providing an accurate reference premise for the formation of rigid support.

[0045] After the reference position of the workpiece is completely locked, the magnetic force mechanism (the specific structure will be described in detail later) supporting the device applies a controllable magnetic field to the flexible bag 5. The magnetorheological fluid in the flexible bag 5 changes from a fluid state to a highly rigid solid state within milliseconds, completely curing the filling form of the flange rib gaps formed in the pre-positioning stage, forming a wrapped rigid support that fits the full contour of the workpiece flange ribs, and forming a complete tooling for positioning and support with the lug two-way positioning structure, completely solving problems such as chatter and yaw of the workpiece during the processing process. During the processing process, the electric turntable 2 on the machine table 1 can drive the workpiece to rotate synchronously through the pallet 3, adapting to the processing requirements of multiple stations and multiple angles of the machine tool. After the processing is completed, the magnetic field is removed, the magnetorheological fluid instantly returns to the fluid state, and the positioning pins 16 move upward and reset, and the workpiece can be removed without hindrance, completing the entire clamping and processing cycle.

[0046] In order to facilitate the realization that the workpiece will not be subjected to excessive impact force during installation, the following features are specifically set:

[0047] Such as Figure 3As shown, a rubber ring 4 is coaxially fixed to the center of the tray 3 to support the lower end of the workpiece. During the workpiece loading and placement process, the rubber ring 4 first contacts the lower end face of the workpiece with the flexible bag 5, providing flexible buffering against the impact force of the workpiece falling, avoiding deformation of the flange ribs and damage to the flexible bag 5 caused by rigid impact of the workpiece. At the same time, the equal-height annular support of the rubber ring 4 ensures that the workpiece remains horizontal after placement, assisting in axial pre-positioning and providing a prerequisite for the subsequent precise alignment of the lug hole and the top pin 25.

[0048] To ensure that the magnetorheological fluid can completely fill the gaps between the flange ribs, the following features are specifically designed:

[0049] like Figure 3 As shown, the flexible bag 5 is made of a high tear-resistant polyurethane composite film. The outline of the flexible bag 5 is adapted to the projected outline of the flange ribs of the workpiece, and is used to completely fill the gaps of the flange ribs. When the workpiece is placed, the high tear-resistant polyurethane composite film has excellent extensibility and tear resistance, and can deform without damage to the flange rib outline. The adapted outline design can ensure that the magnetorheological fluid is accurately concentrated in the flange rib gap area, avoiding ineffective filling, and ensuring that the fluid magnetorheological fluid fills all flange rib gaps without dead corners, providing a foundation for subsequent curing to form a uniform rigid support.

[0050] To provide a sufficiently uniform magnetic force to the flexible bag 5, the following features are specifically designed:

[0051] like Figure 3 and Figure 5 As shown, an electromagnetic generating module 7 for generating magnetic force is installed at the upper end of the tray 3, and a disk 6 is installed at the lower end of the flexible bag 5. The disk 6 is magnetically connected to the magnetic field output end of the electromagnetic generating module 7. When the workpiece reference is locked, the magnetic force generated by the electromagnetic generating module 7 is evenly conducted to the entire area of ​​the flexible bag 5 through the disk 6, ensuring that the magnetorheological fluid in all parts of the flexible bag 5 is synchronously and uniformly magnetized, avoiding the problem of uneven rigidity caused by insufficient local curing, and ensuring that the cured magnetorheological fluid forms a wrap-around support with consistent overall rigidity, providing stable anti-cutting force support for the workpiece.

[0052] In order to perform reference positioning of the workpiece placed on the upper end of the flexible bag 5, the following features are specifically set:

[0053] like Figure 3 As shown, two anchor rods 8 are provided on the upper end of the tray 3. The anchor rods 8 correspond to the support shaft holes at the ends of the workpieces. The upper end of the anchor rods 8 is formed with bullet heads 9 for the workpiece shaft holes to pass through. During the workpiece loading process, the support shaft holes of the workpieces are first guided into the anchor rods 8 along the bullet heads 9 at the upper end of the anchor rods 8. The initial guiding and positioning of the workpieces is completed through the cooperation between the anchor rods 8 and the support shaft holes, reducing the difficulty of aligning the hanging ear holes and the top pins 25, avoiding positional deviations when placing the workpieces, and ensuring the accuracy of pre-positioning and loading efficiency.

[0054] To enable the locating pin 16 to move horizontally so that it can avoid the workpiece during installation and disassembly, the following features are specifically provided:

[0055] like Figure 5 , Figure 8 and Figure 9 As shown, each ear-mounting mechanism 10 also includes a base frame 11 fixedly connected to the upper end of the tray 3. Two guide rails 13 are fixedly connected to the upper end of the base frame 11. Two electric push rods 12 are provided on the side of the two guide rails 13 that are close to each other. The tray 23 is fixedly connected to the base frame 11.

[0056] A support plate 14 is provided on the upper end of the base frame 11. The support plate 14 is slidably connected to two guide rails 13. The output ends of two electric push rods 12 are fixedly connected to the support plate 14. The positioning pin 16 is slidably set on the side of the support plate 14 away from the electric push rods 12.

[0057] Before and during workpiece loading and unloading, the electric actuator 12 drives the support plate 14 to retract along the guide rail 13 away from the center of the tray 3, simultaneously retracting the positioning pin 16 to avoid interference between the positioning pin 16 and the workpiece during loading and unloading. After the workpiece is pre-positioned, the electric actuator 12 drives the support plate 14 to radially feed to the set position, ensuring that the positioning pin 16 and the corresponding top pin 25 are in a completely coaxial state, providing a precise coaxial reference for subsequent bidirectional positioning.

[0058] To ensure stable vertical movement of the locating pin 16, the following features are specifically designed:

[0059] like Figure 5 and Figure 7 As shown, each ear-mounting mechanism 10 also includes a pneumatic actuator 15 mounted on the upper end of the positioning pin 16. The fixed end of the pneumatic actuator 15 is fixedly connected to the support plate 14, and the output end is fixedly connected to the positioning pin 16. When the support plate 14 is fed to the coaxial position of the positioning pin 16 and the top pin 25, the pneumatic actuator 15 synchronously drives the corresponding positioning pin 16 to slide precisely from top to bottom in the vertical direction, ensuring the coaxiality of the positioning pin 16 and the top pin 25. At the same time, the pneumatic actuator 15 can control the insertion stroke and feed speed of the positioning pin 16 to avoid excessively fast insertion that could impact the workpiece, thereby achieving synchronous action of each ear-mounting mechanism 10, ensuring uniform force on the workpiece, and completing bidirectional top-to-top positioning with the top pin 25.

[0060] In order to apply sufficient compressive force to the upper end of the loop without causing deformation of the loop, the following features are specifically designed:

[0061] like Figure 7 and Figure 9As shown, the output end of the pneumatic actuator 15 is fixedly connected to a chuck 18, and the chuck 18 is slidably connected to a locking pin 19 along the circumferential direction. A pressure ring 21 is provided on the side of the chuck 18 near the positioning pin 16, and the pressure ring 21 is fixedly connected to the lower end of the locking pin 19.

[0062] Each locking pin 19 is fitted with a spring 20. One end of the spring 20 is fixed to the pressure ring 21, and the other end is fixed to the chuck 18. The end of the locking pin 19 away from the pressure ring 21 is fixed with a nut 22 to prevent the locking pin 19 from moving downward too much. When the positioning pin 16 is inserted into the lug hole, the pressure ring 21 abuts against the upper end of the lug until the spring 20 is compressed to its limit.

[0063] During the downward movement of the positioning pin 16 driven by the pneumatic actuator 15, the pressure ring 21 first contacts the upper end face of the positioning pin 16 and the hanging ear. As the pneumatic actuator 15 continues to move downward, the spring 20 is uniformly compressed, providing a constant axial clamping force for the hanging ear, avoiding rigid extrusion that could cause deformation of the aluminum alloy hanging ear, and further locking the axial movement freedom of the workpiece, forming a synergistic locking effect with the bidirectional positioning structure, thus improving positioning stability.

[0064] In order to avoid the guide groove on the outer wall of the workpiece, the following features are specifically designed:

[0065] like Figure 3 and Figure 9 As shown, the end of the pallet 23 near the center of the tray 3 is arc-shaped. During the placement and processing of the workpiece, the arc-shaped end of the pallet 23 matches the contour of the guide groove on the outer wall of the workpiece, avoiding rigid interference between the end of the pallet 23 and the workpiece, ensuring that the workpiece can be fully placed in place, improving the adaptability range of the tooling, and preventing the pallet 23 from scratching the outer wall of the workpiece.

[0066] To increase the friction between the workpiece and the pallet 23, the following features are specifically provided:

[0067] like Figure 9 As shown, an anti-slip pad 24 is fixedly connected to the upper end of the support plate 23. During the workpiece pre-positioning stage, the lower end face of the workpiece's hanging ear is in full contact with the anti-slip pad 24 at the upper end of the support plate 23, which greatly increases the static friction between the hanging ear and the support plate 23, preventing the workpiece from slipping during the pre-positioning process, ensuring the alignment accuracy of the hanging ear hole and the top pin 25, and at the same time buffering the impact force when the workpiece is placed, preventing the lower end face of the hanging ear from being bumped or damaged.

[0068] The detailed working principle of this device is as follows:

[0069] In the initial state of the tooling, the electromagnetic generation module 7 is in a de-energized state, and the magnetorheological fluid in the flexible bag 5 is in a free-flowing fluid state; the electric push rods 12 of each ear positioning mechanism 10 drive the support plate 14 to move backward along the guide rail 13, and the positioning pin 16 is in an upward avoidance position driven by the pneumatic push rod 15, leaving sufficient space for the loading and unloading of the workpiece.

[0070] The operator then hoists the inverted non-magnetic aluminum alloy generator end cover workpiece onto the pallet 3. The workpiece's support shaft holes are first guided into the anchor rod 8 along the bullet head 9 at the upper end of the anchor rod 8, completing the initial guiding positioning. The workpiece then falls smoothly, and the rubber ring 4 in the middle of the pallet 3 first contacts the lower end face of the workpiece to buffer the impact of the fall and ensure that the workpiece is placed horizontally. At the same time, the flange rib facing downwards of the workpiece is in full contact with the flexible bag 5. The fluid magnetorheological fluid adapts to the irregular contour of the flange rib and deforms adaptively, filling all the gaps in the flange rib without gaps, completing the initial axial support of the workpiece. At this time, the hanging ear holes in the circumferential direction of the workpiece are precisely fitted onto the upper ends of each top pin 25, and the lower end face of the hanging ear is in contact with the anti-slip pad 24 on the pallet 23, restricting the horizontal translation and rotational freedom of the workpiece, completing the coarse positioning.

[0071] After coarse positioning, the electric actuators 12 of each lug positioning mechanism 10 synchronously drive the support plate 14 to radially feed along the guide rail 13 to the set position, making the positioning pin 16 completely coaxial with the corresponding top pin 25. Subsequently, each pneumatic actuator 15 synchronously drives the positioning pin 16 to slide from top to bottom, precisely inserting it into the corresponding lug hole, forming a bidirectional top-bottom positioning with the lower top pin 25. The tapered rubber sleeve 17 on the outside of the positioning pin 16 and the top pin 25 forms an interference fit with the inner wall of the lug hole, eliminating the fit clearance and locking the axial movement freedom of the workpiece. During the downward movement of the positioning pin 16, the pressure ring 21 first contacts the upper end of the lug, and the spring 20 is compressed to provide a constant axial clamping force, preventing the lug from deforming and completing the complete locking of the workpiece reference position. After the reference is locked, the electromagnetic generation module 7 is powered on, and a uniform and controllable magnetic field is applied to the flexible bag 5 through the disk 6. The magnetorheological fluid changes from a fluid state to a high-rigidity solid state in milliseconds, completely solidifying the filling shape of the flange rib gaps to form a fully enclosed rigid support, forming a positioning-support closed loop with the lug positioning mechanism 10. During processing, the electric turntable 2 drives the workpiece to rotate synchronously through the tray 3, adapting to the multi-station processing requirements of the machine tool. All mechanisms avoid the internal cavity processing path, and there is no tool interference. After processing is completed, the electromagnetic generation module 7 is powered off to remove the magnetic field, and the magnetorheological fluid instantly returns to a fluid state. The pneumatic push rod 15 drives the positioning pin 16 to move upward and reset, and the electric push rod 12 drives the support plate 14 to move backward and avoid obstruction, so that the workpiece can be lifted and removed without obstruction, completing the entire clamping and processing cycle.

[0072] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A tooling fixture for machining generator components, comprising a machine base (1) for machining workpieces, characterized in that, Also includes: The electric turntable (2) is rotated and set on the upper part of the table of the machine tool (1). The upper part of the electric turntable (2) is coaxially fixed with a tray (3). The upper part of the tray (3) is equipped with a flexible bag (5) filled with magnetorheological fluid. When the workpiece is placed on the upper part of the flexible bag (5), the flexible bag (5) fills the gap of the flange rib of the workpiece through the magnetorheological fluid. The upper end of the tray (3) is provided with ear positioning mechanisms (10) arranged at equal angles along the circumference. Each ear positioning mechanism (10) includes a tray plate (23) fixedly set above the tray (3) and a top pin (25) fixedly set in the middle of the tray plate (23). A positioning pin (16) is slidably set above the top pin (25). When the workpiece is placed on the upper end of the flexible bag (5), its ear hole is correspondingly fitted outside each top pin (25). The positioning pin (16) moves from top to bottom and extends into the corresponding ear hole to cooperate with the top pin (25) to perform bidirectional positioning of the workpiece. The positioning pin (16) and the top pin (25) are respectively fitted with tapered rubber sleeves (17). When the positioning pin (16) and the top pin (25) position the workpiece, the tapered rubber sleeves (17) are interference-fitted with the inner wall of the lug.

2. The generator assembly machining tooling fixture according to claim 1, characterized in that, A rubber ring (4) is coaxially fixed in the middle of the tray (3) to support the lower end of the workpiece.

3. The generator assembly machining tooling fixture according to claim 1, characterized in that, The flexible bag (5) is made of a high tear-resistant polyurethane composite film. The outline of the flexible bag (5) is adapted to the projected outline of the workpiece flange rib, and is used to completely fill the flange rib gap.

4. The generator assembly machining tooling fixture according to claim 3, characterized in that, The upper end of the tray (3) is provided with an electromagnetic generating module (7) that generates magnetic force, and the lower end of the flexible bag (5) is provided with a disk (6). The disk (6) is magnetically connected to the magnetic field output end of the electromagnetic generating module (7).

5. The generator assembly machining tooling fixture according to claim 1, characterized in that, Two anchor rods (8) are provided on the upper end of the tray (3). The anchor rods (8) correspond to the support shaft holes at the end of the workpiece. The upper end of the anchor rods (8) is formed with bullet heads (9) for the workpiece shaft holes to pass through.

6. The generator assembly machining tooling fixture according to claim 1, characterized in that, Each ear-mounted positioning mechanism (10) also includes a base frame (11) fixed to the upper end of the tray (3). Two guide rails (13) are fixed to the upper end of the base frame (11). Two electric push rods (12) are provided on the side of the two guide rails (13) that are close to each other. The tray (23) is fixed to the base frame (11). The base frame (11) is provided with a support plate (14) at the upper end. The support plate (14) is slidably connected to two guide rails (13). The output ends of two electric push rods (12) are fixedly connected to the support plate (14). The positioning pin (16) is slidably set on the side of the support plate (14) away from the electric push rods (12).

7. A generator assembly machining tooling fixture according to claim 6, characterized in that, Each ear-mounted positioning mechanism (10) also includes a pneumatic rod (15) set on the upper end of the positioning pin (16). The fixed end of the pneumatic rod (15) is fixedly connected to the support plate (14), and the output end is fixedly connected to the positioning pin (16).

8. A tooling fixture for machining generator components according to claim 7, characterized in that, The output end of the pneumatic actuator (15) is fixedly connected to a chuck (18), and the chuck (18) is slidably connected to a locking pin (19) in the circumferential direction. A pressure ring (21) is provided on the side of the chuck (18) near the positioning pin (16), and the lower end of the pressure ring (21) is fixedly connected to the locking pin (19). Each locking pin (19) is fitted with a spring (20). One end of the spring (20) is fixed to the pressure ring (21), and the other end is fixed to the chuck (18). The end of the locking pin (19) away from the pressure ring (21) is fixed with a nut (22) to prevent the locking pin (19) from moving downwards too much. When the positioning pin (16) is inserted into the lug hole, the pressure ring (21) abuts against the upper end of the lug until the spring (20) is compressed to its limit.

9. A tooling fixture for machining generator components according to claim 1, characterized in that, The end of the pallet (23) near the center of the tray (3) is arc-shaped.

10. A generator assembly machining tooling fixture according to claim 9, characterized in that, An anti-slip pad (24) is fixed to the upper end of the tray (23).

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