An aluminum alloy aviation framework forging precision machining production line and a machining method thereof

Abstract

This invention relates to the field of precision machining technology for aerospace components, specifically a production line and method for precision machining of aluminum alloy aerospace frame forgings. The production line includes: a forming process, a trimming process, a surface treatment process, and a quality inspection process. The surface treatment process includes an anodizing line and a polishing and cleaning line. The polishing and cleaning line includes a polishing station, on which a placement plate and a translation drive module are provided. The translation drive module drives the placement plate to reciprocate along the polishing path. A floating grinding component is provided on the placement plate; the floating grinding component ensures that the grinding wheel adheres to the workpiece surface with a constant clamping force. A spray gun on the placement plate is connected to a fluid supply unit via a switching component. The switching component can drive the spray gun to switch positions so that the spraying direction of the spray gun is always opposite to the cutting direction of the grinding wheel, allowing the cutting fluid to enter the gap of the grinding wheel, thereby improving the cooling effect.

Description

Technical Field

[0001] This invention relates to the field of precision machining technology for aerospace components, specifically a production line and processing method for precision machining of aluminum alloy aerospace frame forgings. Background Technology

[0002] Aluminum alloy aerospace frame forgings are the main load-bearing components of aircraft structures. To meet the high standards of weight reduction and high strength required by aircraft, these parts are generally designed as thin-walled cavity structures. After forging, the surface of the parts needs to undergo high-precision polishing to eliminate forging marks, improve surface stress distribution, and provide a high-quality base for subsequent anodizing.

[0003] Currently, traditional polishing equipment mostly uses rigid connections to drive the grinding wheel, lacking an effective flexible compensation mechanism. When there are micro-undulations on the workpiece surface, the clamping force of the grinding wheel on the workpiece will change. Especially when grinding thin-walled, easily deformable workpieces such as aluminum alloy aerospace frames, if the clamping force is too large, it can easily cause elastic deflection or plastic indentation in the thin-walled web; if the clamping force is too small, it will lead to weak grinding or the generation of chatter marks. This instability of the clamping force directly leads to uneven material removal rate, difficulty in controlling the accuracy of machining allowance, and may even cause workpiece deformation under stress, resulting in machining errors and seriously affecting the consistency of dimensional accuracy.

[0004] Furthermore, existing equipment often employs unidirectional feed grinding during the polishing process. During the removal of excess material, the unidirectional cutting force subjects the thin-walled frame beam structure to continuous unilateral shear stress and bending moment. Due to the low elastic modulus of aluminum alloy, this asymmetrical stress state easily induces springback deformation or lateral bending in the workpiece, leading to out-of-tolerance workpiece profiles. In severe cases, it can even result in the entire part being scrapped, making it difficult to meet the geometric tolerance requirements of aerospace-grade precision components. Summary of the Invention

[0005] The purpose of this invention is to provide a production line and processing method for precision machining of aluminum alloy aerospace frame forgings, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A production line for precision machining of aluminum alloy aerospace frame forgings includes: forming process, trimming process, surface treatment process, and quality inspection process. The surface treatment process is equipped with an anodizing line and a polishing and cleaning line. The polishing and cleaning line includes a polishing station for placing workpieces. The polishing station is provided with a placement plate and a translation drive module. The translation drive module is connected to the placement plate and can drive the placement plate to reciprocate along the length direction of the polishing station. A floating polishing component is provided on the placement plate.

[0008] The floating grinding assembly is detachably connected to a grinding wheel, which allows the grinding wheel to adhere to the workpiece surface with a constant clamping force.

[0009] The mounting plate is also equipped with a spray gun. The spray gun is connected to a liquid supply device on the mounting plate via a switching component. The switching component can drive the spray gun to switch positions so that the spraying direction of the spray gun is always opposite to the cutting rotation direction of the abrasive wheel.

[0010] The production line for precision machining of aluminum alloy aerospace frame forgings as described above: The translation drive module includes mounting plates symmetrically arranged along the length direction of the polishing station. The mounting plates are connected to cylinders arranged on the polishing station. Each set of mounting plates is provided with a longitudinal drive shaft. A transverse drive shaft is provided between the two sets of longitudinal drive shafts. The transverse drive shaft is connected to the placement plate and can drive the placement plate to move along the length direction of the polishing station.

[0011] The production line for precision machining of aluminum alloy aerospace frame forgings as described above: the floating grinding assembly includes a mounting box set on the placement plate, a rotating cylinder rotatably mounted inside the mounting box, the rotating cylinder being coaxially connected to the output shaft of a servo motor set on the mounting box, and a lifting component elastically arranged inside the rotating cylinder.

[0012] The production line for precision machining of aluminum alloy aerospace frame forgings as described above: the lifting component includes a telescopic cylinder inserted into the rotating cylinder, and a slider is provided on the inner wall of the telescopic cylinder, the slider being slidably disposed in a groove opened in the rotating cylinder.

[0013] The production line for precision machining of aluminum alloy aerospace frame forgings as described above: the spray gun is connected to the sleeve ring fitted on the telescopic cylinder, and the spray gun is slidably arranged in the arc-shaped track connected to the mounting box.

[0014] The production line for precision machining of aluminum alloy aerospace frame forgings as described above: the liquid supply component includes a liquid supply pipe installed on the mounting box, a ball core is installed at the end of the liquid supply pipe, the ball core has a left discharge hole and a right discharge hole, and the ball core is coaxial with the rotating cylinder.

[0015] The production line for precision machining of aluminum alloy aerospace frame forgings as described above: the switching component includes a conductor, a drive component, and a rotating component. The conductor includes a spherical seat, on which a connecting pipe is installed. The spray gun is inserted into the connecting pipe, and the ball core is placed inside the spherical seat.

[0016] The production line for precision machining of aluminum alloy aerospace frame forgings as described above: the rotating component includes a drive cylinder, which is disposed on the spherical seat and coaxial with the rotating cylinder, and the inner wall of the drive cylinder is provided with a threaded groove.

[0017] The production line for precision machining of aluminum alloy aerospace frame forgings as described above: the driving component includes an electric push rod disposed on the placement plate, the outer wall of the telescopic end of the electric push rod is provided with a protrusion, and the protrusion is slidably embedded in the threaded groove.

[0018] A machining method for precision machining of aluminum alloy aerospace frame forgings is also proposed, which uses the production line for precision machining of aluminum alloy aerospace frame forgings as described above, and includes the following steps:

[0019] Step 1: Place the workpiece to be polished on the polishing station table, use the cylinder to pull the mounting plate down to a certain height so that the grinding wheel contacts the surface of the workpiece, then start the servo motor to drive the rotating cylinder, telescopic cylinder and grinding wheel to rotate in the forward direction. At this time, the spray gun is located on one side of the movement direction of the subsequent placement plate and sprays cutting fluid against the rotation direction of the grinding wheel.

[0020] Step 2: When the horizontal drive shaft drives the shelf to the end of its stroke, the electric push rod enters the working state, drives the protrusion to move vertically, and cooperates with the threaded groove to drive the drive cylinder to rotate until the protrusion moves to the preset position. Then the drive cylinder drives the ball seat and the spray gun to rotate to the other side.

[0021] Step 3: Next, the cylinder pulls the mounting plate down a certain height, so that the pressure of the grinding wheel on the workpiece is the same as the previous pressure. Then, the servo motor reverses, and the horizontal drive shaft drives the placement plate to move in the opposite direction to perform secondary grinding on the workpiece until the placement plate returns to the initial position, and the polishing is completed.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] By setting up a floating grinding mechanism, the grinding wheel can be pressed against the workpiece surface with constant pressure through the cooperation between the rotating cylinder, the telescopic cylinder and the spring that is always in a compressed state. This reduces the processing error when processing thin-walled and easily deformable workpieces such as aluminum alloy aerospace frame forgings, and ensures that the material removal rate remains constant throughout the grinding process, thereby improving the consistency of surface treatment and dimensional accuracy.

[0024] By setting a switching component, the position of the spray gun is adjusted when the grinding wheel changes direction, so that the spray gun can always spray cutting fluid against the direction of grinding wheel rotation and aim at the biting point. This reverse spraying method can break through the air barrier formed by the high-speed rotation of the grinding wheel, allowing the cutting fluid to effectively enter the grinding wheel pores and reach the cutting interface, thereby improving cooling and lubrication efficiency. Combined with low-temperature micro-lubrication technology, it can effectively prevent aluminum alloy from tempering softening or orange peel phenomenon due to overheating, and improve the bonding quality of subsequent anodized film.

[0025] During grinding, the grinding wheel is controlled to rotate forward and backward by a servo motor, and in conjunction with the reciprocating movement of the transverse drive shaft, it can first grind 50% of the workpiece in the forward direction, and then grind the remaining 50% in the reverse direction. This bidirectional symmetrical cutting method can offset the problem of uneven force on one side caused by unidirectional cutting, and reduce the risk of bending deformation of aluminum alloy aerospace skeleton forgings with thin-walled frame beam structure during processing. Attached Figure Description

[0026] Figure 1 A schematic diagram of the polishing station in a production line for precision machining of aluminum alloy aerospace frame forgings;

[0027] Figure 2 A schematic diagram of the negative pressure pump inside the polishing station in a production line for precision machining of aluminum alloy aerospace frame forgings.

[0028] Figure 3 A schematic diagram of the translation drive module in a production line for precision machining of aluminum alloy aerospace frame forgings;

[0029] Figure 4 A schematic diagram of the structure on the shelf in a production line for precision machining of aluminum alloy aerospace frame forgings;

[0030] Figure 5 A schematic diagram of the liquid supply component and the conductive component in a production line for precision machining of aluminum alloy aerospace frame forgings;

[0031] Figure 6 A schematic diagram of the drive components and conductors in a production line for precision machining of aluminum alloy aerospace frame forgings;

[0032] Figure 7 A schematic diagram of the connection between the conductive component and the liquid supply component in a production line for precision machining of aluminum alloy aerospace frame forgings;

[0033] Figure 8 A schematic diagram of the drive component in a production line for precision machining of aluminum alloy aerospace frame forgings;

[0034] Figure 9 A schematic diagram of the connection between the spray gun and the mounting box in a production line for precision machining of aluminum alloy aerospace frame forgings;

[0035] Figure 10 A schematic diagram of the floating grinding assembly in a production line for precision machining of aluminum alloy aerospace frame forgings.

[0036] In the diagram: 1. Polishing station; 2. Fixture; 3. Mounting plate; 4. Longitudinal drive shaft; 5. Transverse drive shaft; 6. Bottom support plate; 7. Lateral suction plate; 8. Negative pressure pump; 9. Cylinder; 10. Shelf; 11. Grinding wheel; 12. Mounting box; 13. Arc track; 14. Spray gun; 15. Connecting pipe; 16. Spherical seat; 17. Liquid supply pipe; 18. Ball core; 1801. Left discharge hole; 1802. Right discharge hole; 19. Electric push rod; 1901. Protrusion; 20. Drive cylinder; 2001. Threaded groove; 21. Servo motor; 22. Collar ring; 23. Telescopic cylinder; 2301. Slider; 24. Rotating cylinder; 2401. Slide groove; 25. Spring. Detailed Implementation

[0037] Various exemplary embodiments, features, and aspects of this application will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0038] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0039] Furthermore, to better illustrate this application, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that this application can be implemented without certain specific details. In some instances, methods, means, and elements well-known to those skilled in the art have not been described in detail, in order to highlight the main points of this application.

[0040] Please see Figures 1-10 In this embodiment of the invention, a production line for precision machining of aluminum alloy aerospace frame forgings includes:

[0041] The process includes forming, trimming, surface treatment, and quality inspection. The surface treatment process includes an anodizing line and a polishing and cleaning line. The polishing and cleaning line includes a polishing station 1 for placing workpieces. The polishing station 1 is equipped with a placement plate 10 and a translation drive module. The translation drive module is connected to the placement plate 10 and can drive the placement plate 10 to reciprocate along the length of the polishing station 1. A floating polishing component is provided on the placement plate 10.

[0042] Specifically, please refer to Figure 1 , Figure 2 The polishing station 1 is also equipped with multiple sets of clamps 2, which can hold the workpiece and prevent the workpiece from shifting during the polishing process.

[0043] Please see Figure 1 , Figure 2 , Figure 3 The translation drive module includes mounting plates 3 symmetrically arranged along the length direction of the polishing station 1. The mounting plates 3 are connected to cylinders 9 arranged on the polishing station 1. Each set of mounting plates 3 is provided with a longitudinal drive shaft 4. A transverse drive shaft 5 is arranged between two sets of longitudinal drive shafts 4. The transverse drive shaft 5 is connected to the placement plate 10 and can drive the placement plate 10 to move along the length direction of the polishing station 1.

[0044] With the cooperation of the cylinder 9, the longitudinal drive shaft 4 and the transverse drive shaft 5, the position of the placement plate 10 can be freely adjusted according to the specifications of the workpiece to be polished, so that the floating grinding component set on the placement plate 10 can grind the workpiece.

[0045] Specifically, the bottom support plate 6 and the side adsorption plate 7 of the polishing station 1 are provided with dense holes, and the bottom support plate 6 and the side adsorption plate 7 are connected to the negative pressure pump 8 installed in the polishing station 1. When the floating grinding component is working, the negative pressure pump 8 enters the working state and can adsorb the residue after cutting through the bottom support plate 6 and the side adsorption plate 7, thereby reducing the splashing of residue during the grinding process.

[0046] Please see Figure 4 , Figure 9 , Figure 10 The floating grinding assembly is detachably connected to a grinding wheel 11, which enables the grinding wheel 11 to adhere to the workpiece surface with a constant clamping force.

[0047] In detail, the floating polishing assembly includes a mounting box 12 disposed on the placement plate 10, a rotating cylinder 24 is rotatably mounted inside the mounting box 12, the rotating cylinder 24 is coaxially connected to the output shaft of the servo motor 21 disposed on the mounting box 12, and a lifting component is elastically disposed inside the rotating cylinder 24;

[0048] The lifting component includes a telescopic cylinder 23 inserted into the rotating cylinder 24. The inner wall of the telescopic cylinder 23 is provided with a slider 2301. The slider 2301 is slidably disposed in the groove 2401 opened in the rotating cylinder 24. With the cooperation of the slider 2301 and the groove 2401, the telescopic cylinder 23 can only slide relative to the rotating cylinder 24. Therefore, when the servo motor 21 is working, it can drive the grinding wheel 11 to rotate at high speed through the rotating cylinder 24 and the telescopic cylinder 23, thereby polishing the surface of the workpiece.

[0049] For details, please refer to Figure 10 A spring 25 is provided inside the rotating cylinder 24. One end of the spring 25 abuts against the inner wall of the rotating cylinder 24, and the other end abuts against the telescopic cylinder 23. The spring 25 is always in a compressed state, which pushes the telescopic cylinder 23 to move away from the mounting box 12.

[0050] When the cylinder 9 drives the mounting plate 3 to descend, the grinding wheel 11 will gradually come into contact with the workpiece, and the spring 25 will be further compressed. During the compression process, the pressure sensor installed inside the telescopic cylinder 23 will monitor the elastic potential energy of the spring 25 in real time. When the preset value is reached, the pressure sensor sends a stop signal to the cylinder 9, so that the mounting plate 3 is maintained at the specified height. Subsequently, when the grinding wheel 11 moves along the workpiece, the spring 25 can always keep the grinding wheel 11 pressing on the workpiece with the same force, so that the material removal rate remains constant throughout the grinding process.

[0051] Further, please refer to Figures 1-10 The shelf 10 is also provided with a spray gun 14. The spray gun 14 is connected to the liquid supply component provided on the shelf 10 through a switching component provided on the shelf 10. The switching component can drive the spray gun 14 to switch positions so that the spraying direction of the spray gun 14 is always opposite to the cutting rotation direction of the abrasive wheel 11.

[0052] The liquid supply component includes a liquid supply pipe 17 installed on the mounting box 12. A ball core 18 is installed at the end of the liquid supply pipe 17. The ball core 18 has a left discharge hole 1801 and a right discharge hole 1802. The ball core 18 is coaxial with the rotating cylinder 24.

[0053] In detail, the aforementioned liquid supply pipe 17 is connected to a pumping structure (not shown in the figure) installed on the polishing station 1. The pumping structure can continuously and stably supply cutting fluid to the liquid supply pipe 17 according to the polishing situation. The cutting fluid can be sprayed using low-temperature micro-lubrication, using atomized vegetable oil and compressed air in combination to replace large-flow coolant (not limited to the above method), thereby achieving the purpose of cooling, lubricating and chip removal of the workpiece during polishing. At the same time, combined with the negative pressure suction of the negative pressure pump 8, the splashing of residual chips can be further reduced.

[0054] Please see Figures 4-9 The switching component includes a conductor, a drive component, and a rotating component. The conductor includes a ball seat 16, on which a connecting pipe 15 is mounted. The spray gun 14 is inserted into the connecting pipe 15, and the ball core 18 is placed inside the ball seat 16.

[0055] Specifically, the spray gun 14 is connected to the sleeve ring 22 fitted on the telescopic cylinder 23, and the spray gun 14 is slidably disposed within the arc-shaped track 13 connected to the mounting box 12. Due to the constraint of the arc-shaped track 13, the spray gun 14 will not shift outwards when it is rotated and repositioned. It should be particularly noted that, referring to... Figure 4 The spray gun 14 is deflected along the thickness direction of the mounting plate 10 so that there is a certain angle between the spray gun 14 and the horizontal plane, thereby meeting the abrasive wheel 11 to spray cutting fluid. With the setting of the connecting ring 22, the relative height of the spray gun 14 and the abrasive wheel 11 in the vertical direction will not change.

[0056] The rotating component includes a drive cylinder 20, which is disposed on the spherical seat 16 and coaxial with the rotating cylinder 24. The inner wall of the drive cylinder 20 is provided with a threaded groove 2001.

[0057] The driving component includes an electric push rod 19 disposed on the shelf 10. The outer wall of the telescopic end of the electric push rod 19 is provided with a protrusion 1901, and the protrusion 1901 is slidably embedded in the threaded groove 2001.

[0058] In the initial state, the placement plate 10 is located at the left end of the travel of the transverse drive shaft 5. At this time, the spray gun 14 is located on the right side of the abrasive wheel 11. When the mounting plate 3 descends to the preset height, the servo motor 21 is started. At this time, the servo motor 21 drives the abrasive wheel 11 to rotate clockwise. The spray gun 14 sprays against the rotation direction of the abrasive wheel 11 and the biting point between the abrasive wheel 11 and the workpiece.

[0059] When the placement plate 10 moves to the right end of the travel distance of the transverse drive shaft 5 (the moving distance is much greater than the distance of the workpiece to prevent the workpiece edge from not being polished properly), the servo motor 21 pauses intermittently, the grinding wheel 11 is reset under the action of the elastic potential energy released by the spring 25, the cylinder 9 controls the mounting plate 3 to reset, and after the transverse drive shaft 5 drives the placement plate 10 to move above the workpiece, the cylinder 9 descends and stops after descending a certain height with the cooperation of the pressure sensor.

[0060] Furthermore, during the shutdown of the servo motor 21, the electric push rod 19 moves, driving the protrusion 1901 to descend, so that the drive cylinder 20 can drive the ball seat 16 to rotate clockwise. When the electric push rod 19 stops moving, the protrusion 1901 moves to the end of the stroke of the thread groove 2001, forcing the drive cylinder 20 and the ball seat 16 to rotate at a certain angle, and making the connecting pipe 15 connected to the left discharge hole 1801. At this time, the spray gun 14 is located on the left side of the grinding wheel 11. When the servo motor 21 drives the grinding wheel 11 to rotate counterclockwise in the opposite direction, the spray gun 14 can still spray against the rotation direction of the grinding wheel 11 to the biting point between the grinding wheel 11 and the workpiece.

[0061] This reverse injection method allows the cutting fluid to break through the air barrier formed on the surface of the grinding wheel 11 when it rotates at high speed and enter the pores of the grinding wheel 11, thereby improving the cooling efficiency, reducing the surface temperature of the workpiece, preventing the aluminum alloy from tempering and softening or orange peel phenomenon due to overheating, and helping the subsequent bonding of the anodized film.

[0062] Furthermore, the reciprocating cutting and the forward and reverse rotation of the grinding wheel 11 can first grind 50% of the allowance in the forward direction, and then grind the remaining 50% in the reverse direction, reducing the bending deformation of aluminum alloy aerospace skeleton forgings with thin-walled frame beam structures due to uneven force on one side.

[0063] A machining method for precision machining of aluminum alloy aerospace frame forgings is also proposed, which uses the production line for precision machining of aluminum alloy aerospace frame forgings as described above, and includes the following steps:

[0064] Step 1: Place the workpiece to be polished on the polishing station 1, and use the cylinder 9 to pull the mounting plate 3 down to a certain height so that the grinding wheel 11 contacts the surface of the workpiece. Then start the servo motor 21 to drive the rotating cylinder 24, the telescopic cylinder 23 and the grinding wheel 11 to rotate in the forward direction. At this time, the spray gun 14 is located on one side of the moving direction of the subsequent placement plate 10 and sprays cutting fluid in the opposite direction of the rotation of the grinding wheel 11.

[0065] Step 2: When the transverse drive shaft 5 drives the shelf 10 to the end of its stroke, the electric push rod 19 enters the working state, drives the protrusion 1901 to move in the vertical direction, and cooperates with the threaded groove 2001 to drive the drive cylinder 20 to rotate until the protrusion 1901 moves to the preset position, the drive cylinder 20 drives the ball seat 16 and the spray gun 14 to rotate to the other side.

[0066] Step 3: Next, cylinder 9 pulls the mounting plate 3 down to a certain height, so that the pressure of the grinding wheel 11 on the workpiece is the same as the previous pressure. Then, servo motor 21 reverses, and horizontal drive shaft 5 drives the placement plate 10 to move in the opposite direction to perform secondary grinding on the workpiece until the placement plate 10 returns to the initial position, and polishing is completed.

[0067] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0068] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A production line for precision machining of aluminum alloy aerospace frame forgings, comprising: The process includes forming, trimming, surface treatment, and quality inspection. The surface treatment process includes an anodizing line and a polishing and cleaning line. Its characteristics are: The polishing and cleaning line includes a polishing station (1) for placing workpieces. The polishing station (1) is provided with a placement plate (10) and a translation drive module. The translation drive module is connected to the placement plate (10) and can drive the placement plate (10) to reciprocate along the length of the polishing station (1). The placement plate (10) is provided with a floating polishing component. The floating grinding assembly is detachably connected to a grinding wheel (11), which enables the grinding wheel (11) to adhere to the workpiece surface with a constant clamping force; The shelf (10) is also provided with a spray gun (14). The spray gun (14) is connected to the liquid supply component on the shelf (10) through a switching component on the shelf (10). The switching component can drive the spray gun (14) to switch positions so that the spraying direction of the spray gun (14) is always opposite to the cutting rotation direction of the abrasive wheel (11).

2. The production line for precision machining of aluminum alloy aerospace frame forgings according to claim 1, characterized in that, The translation drive module includes mounting plates (3) symmetrically arranged along the length direction of the polishing station (1). The mounting plates (3) are connected to cylinders (9) arranged on the polishing station (1). Each set of mounting plates (3) is provided with a longitudinal drive shaft (4). A transverse drive shaft (5) is provided between the two sets of longitudinal drive shafts (4). The transverse drive shaft (5) is connected to the placement plate (10) and can drive the placement plate (10) to move along the length direction of the polishing station (1).

3. The production line for precision machining of aluminum alloy aerospace frame forgings according to claim 2, characterized in that, The floating polishing assembly includes a mounting box (12) disposed on the placement plate (10), a rotating cylinder (24) is rotatably mounted inside the mounting box (12), the rotating cylinder (24) is coaxially connected to the output shaft of a servo motor (21) disposed on the mounting box (12), and a lifting component is elastically disposed inside the rotating cylinder (24).

4. The production line for precision machining of aluminum alloy aerospace frame forgings according to claim 3, characterized in that, The lifting component includes a telescopic cylinder (23) inserted into the rotating cylinder (24). The inner wall of the telescopic cylinder (23) is provided with a slider (2301), which is slidably disposed in a groove (2401) opened in the rotating cylinder (24).

5. The production line for precision machining of aluminum alloy aerospace frame forgings according to claim 4, characterized in that, The spray gun (14) is connected to the sleeve ring (22) sleeved on the telescopic cylinder (23), and the spray gun (14) is slidably disposed in the arc track (13) connected to the mounting box (12).

6. The production line for precision machining of aluminum alloy aerospace frame forgings according to claim 3, characterized in that, The liquid supply component includes a liquid supply pipe (17) installed on the mounting box (12). A ball core (18) is installed at the end of the liquid supply pipe (17). The ball core (18) has a left discharge hole (1801) and a right discharge hole (1802). The ball core (18) is coaxial with the rotating cylinder (24).

7. The production line for precision machining of aluminum alloy aerospace frame forgings according to claim 6, characterized in that, The switching assembly includes a conductor, a drive, and a rotating component. The conductor includes a ball seat (16), on which a connecting tube (15) is mounted. The spray gun (14) is inserted into the connecting tube (15), and the ball core (18) is placed inside the ball seat (16).

8. The production line for precision machining of aluminum alloy aerospace frame forgings according to claim 7, characterized in that, The rotating component includes a drive cylinder (20), which is disposed on the spherical seat (16) and coaxial with the rotating cylinder (24), and the inner wall of the drive cylinder (20) is provided with a threaded groove (2001).

9. The production line for precision machining of aluminum alloy aerospace frame forgings according to claim 8, characterized in that, The driving component includes an electric push rod (19) disposed on the shelf (10). The outer wall of the telescopic end of the electric push rod (19) is provided with a protrusion (1901), which is slidably embedded in the threaded groove (2001).

10. A method for precision machining of aluminum alloy aerospace frame forgings, characterized in that, The production line for precision machining of aluminum alloy aerospace frame forgings as described in claim 1 includes the following steps: Step 1: Place the workpiece to be polished on the polishing station (1), use the cylinder (9) to pull the mounting plate (3) down to a certain height so that the grinding wheel (11) contacts the surface of the workpiece, then start the servo motor (21) to drive the rotating cylinder (24), the telescopic cylinder (23) and the grinding wheel (11) to rotate in the forward direction. At this time, the spray gun (14) is located on one side of the moving direction of the subsequent placement plate (10), and sprays cutting fluid against the rotation direction of the grinding wheel (11). Step 2: When the transverse drive shaft (5) drives the shelf (10) to the end of its stroke, the electric push rod (19) enters the working state, drives the protrusion (1901) to move in the vertical direction, and cooperates with the threaded groove (2001) to drive the drive cylinder (20) to rotate until the protrusion (1901) moves to the preset position, the drive cylinder (20) drives the ball seat (16) and the spray gun (14) to rotate to the other side; Step 3: Next, the cylinder (9) pulls the mounting plate (3) down to a certain height so that the pressure of the grinding wheel (11) on the workpiece is the same as the previous pressure. Then the servo motor (21) reverses and the horizontal drive shaft (5) drives the placement plate (10) to move in the opposite direction to perform secondary grinding on the workpiece until the placement plate (10) returns to the initial position, and the polishing is completed.

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