Milling machine tool for planet carrier and planet gear mounting surface and process method thereof

Abstract

The present invention discloses a milling machine tool for the mounting surface of a planetary carrier and a planetary gear and a process method thereof, which belongs to the technical field of engineering machinery. It solves the defects of low processing efficiency, fast tool wear and poor processing accuracy of traditional milling machine tools in the prior art. Its main structure includes a base, a mounting seat and a chip removal cooling device are provided on the base, a milling head structure, a spindle drive device, a feeding device, a clamping and rotating device and a lubrication device are provided on the mounting seat, and the spindle drive device is connected to the feeding device and the milling head structure respectively. The present invention is mainly used for processing the mounting surface of a planetary carrier and a planetary gear.

Description

Technical fields:

[0001] This invention belongs to the field of engineering machinery technology, and more specifically, it relates to a milling machine tool for the planetary carrier planetary gear mounting surface and its processing method. Background technology:

[0002] Planetary gearboxes, reducers, and other similar products are designed with planetary carriers, which can be equipped with several planetary gears. These planetary gears function to reduce speed and increase torque within the reducer. The machining accuracy of the mounting surfaces inside the planetary carrier that are used to mount the planetary gears directly affects the mounting accuracy of the planetary gears, which in turn affects the gear meshing accuracy. This is a crucial factor affecting the performance and reliability of the reducer.

[0003] The following are some of the existing processing methods for the planetary carrier planetary gear mounting surfaces.

[0004] 1. On a conventional horizontal milling machine, the planetary carrier part is positioned and clamped using a special fixture. One end of a special tool holder is mounted on the spindle, and the other end passes through the planetary carrier pin hole and is inserted into the tooling hole as a support. A high-speed steel tool bar is mounted on the tool holder, and the two mounting surfaces are machined using forward and reverse countersinking. 2. Roughing is performed on a horizontal milling machine using a multi-flute end mill to side-mill the mounting surface, and finishing is performed on a vertical milling machine using forward and reverse countersinking. 3. On a CNC lathe, roughing is performed using a lathe fixture, a special tool holder, and replaceable coated inserts. On a vertical machining center, a special tool holder and replaceable coated inserts are used to machine the upper and lower mounting surfaces. 4. On a milling machine, two three-sided end mills are used to mill the upper and lower mounting surfaces radially from the outside to the inside of the planetary carrier, as in the patent application number 201220012009.0.

[0005] However, the above methods have the following drawbacks:

[0006] 1. On a milling machine, lathe, or machining center, a tool holder is passed through the pin hole, and two mounting surfaces are machined using a high-speed steel tool or coated insert. This method is limited by the size of the pin hole, has poor tool rigidity, and the surface is prone to concavity or convexity. Single-edge cutting is used, resulting in low machining efficiency and poor surface roughness. 2. On a milling machine or machining center, an end mill is used to mill the two mounting surfaces using its side edge. This method involves multi-layer milling, resulting in low machining efficiency, rapid tool wear, poor machining accuracy, and poor surface roughness. It is generally used for roughing. 3. On a milling machine, a three-sided milling cutter is used to mill along the radial direction of the planetary carrier. This requires the mounting surfaces to be close to the radial outer edge, and the planetary carrier opening size to be sufficiently large; otherwise, the cutter head or tool holder will interfere with the workpiece. This method has a narrower application range. Summary of the Invention:

[0007] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a milling machine tool and process method for machining the planetary carrier and planetary gear mounting surface, which has good machining accuracy, high efficiency, low machining cost and high degree of automation.

[0008] To achieve the above objectives, the present invention employs the following technical solution:

[0009] A milling machine tool for planetary carrier planetary gear mounting surface includes a base, on which a mounting seat and a chip removal and cooling device are provided. The mounting seat is provided with a milling head structure, a spindle drive device, a feed device, a clamping and rotating device and a lubrication device. The spindle drive device is connected to the feed device and the milling head structure respectively.

[0010] Preferably, the milling head structure includes an input gear, an intermediate gear, and an output gear. The input gear is mounted on an input shaft and is connected to the output gear through the intermediate gear. Each end of the output gear is provided with a three-sided milling cutter.

[0011] Preferably, the output gear is provided with an output shaft, and the two ends of the output shaft are provided with threads of opposite directions. The three-sided milling cutter is connected to the output shaft by the threads. The output shaft is also provided with an adjusting shim, a bearing and a pressure cap. The adjusting shim is installed between the three-sided milling cutter and the bearing.

[0012] Preferably, the spindle drive device includes a milling head and a spindle motor. The milling head structure is installed inside the milling head, and two three-sided milling cutters are installed on the outside of the milling head. The spindle motor is connected to the input shaft through a transmission mechanism.

[0013] Preferably, the feeding device includes a servo motor, a motor base, a ball screw, a guide rail, a slider, and a slide table. The servo motor is mounted on the motor base, and both the motor base and the guide rail are mounted on a mounting base. The output end of the servo motor is connected to the ball screw, and a ball screw nut is provided on the ball screw. The ball screw nut is connected to the slide table, the slider is mounted on the guide rail, and both ends of the slide table are slidably connected to the slider. The milling head is mounted on the slide table.

[0014] Preferably, the clamping and rotating device includes a dovetail slide, a hydraulic cylinder, a CNC rotary table, and a hydraulic chuck. The dovetail slide is mounted on a base, the CNC rotary table is mounted on the dovetail slide via a pressure plate, the hydraulic chuck is mounted on the CNC rotary table, and the hydraulic cylinder is connected to the hydraulic chuck via a hollow shaft and a connecting rod passing through the center hole of the CNC rotary table. A handwheel is also provided on one side of the dovetail slide.

[0015] Preferably, the chip removal and cooling device includes a chip conveyor, a cutting fluid pump, a cutting fluid tank, and a collection tank. The collection tank is connected to the chip conveyor through the cutting fluid tank. A chip box is provided at the lower end of the outlet of the chip conveyor. The cutting fluid pump is connected to a nozzle through a cutting fluid pipeline. The nozzle is located on the side of the three-sided milling cutter.

[0016] Preferably, the lubrication device includes a lubrication pump and an oil distributor. The lubrication pump is connected to the oil distributor through a lubrication oil pipe, and the oil distributor is connected to the lubrication nozzles on the milling head, the ball screw nut, and the slider through branch oil pipes.

[0017] Preferably, the milling head structure, spindle drive device, and feed device are each provided in two sets, and are arranged symmetrically on the left and right.

[0018] A process method using a milling machine tool for planetary carrier and planetary gear mounting surfaces as described above specifically includes: the operator installing the planetary carrier part between the jaws of a hydraulic chuck, with the end face of the planetary carrier part pressed against the positioning end face of the hydraulic chuck; the operator pressing the start button, activating the hydraulic cylinder, which in turn moves the jaws of the hydraulic chuck to clamp the planetary carrier part; subsequently, the spindle motor starts, driving the input gear on the milling head through a transmission mechanism, and through the meshing of multiple intermediate gears, the three-sided milling cutter rotates at a given speed; two servo motors start, driving the ball screw to rotate, the ball screw nut to perform linear motion, and driving the slide, milling head, and spindle motor to perform infeed on the guide rail. The process begins with the three-sided milling cutter reaching the milled surface. The coolant pump activates, spraying coolant from the nozzle. The feed rate switches from rapid motion to cutting feed, initiating the machining of the mounting surface. Once the three-sided milling cutter reaches the designated position, one set of surfaces is machined. The servo motor reverses, and the milling head returns to the starting position at rapid motion. The CNC rotary table rotates 90 degrees, and the other set of surfaces on the planetary carrier part reaches the machining position. The servo motor starts again, repeating the previous action to complete the machining of the other set of surfaces. After all machining is complete, the milling head returns to the safe position, the spindle motor stops, the coolant is shut off, the hydraulic chuck releases, and the operator removes the planetary carrier part to begin the next cycle.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. The milling head structure avoids interference between the milling head, cutting tool and planetary carrier parts. The three-sided milling cutter extends from the side between the upper and lower mounting surfaces of the planetary carrier for machining. The three-sided milling cutter uses replaceable coated inserts, which are easy to replace and maintain. Each cutter head has eight cutting edges, resulting in high machining efficiency. The distance between the tips of the upper and lower three-sided milling cutters is designed to match the distance between the upper and lower mounting surfaces of the planetary carrier. The distance and parallelism of the upper and lower mounting surfaces are determined by the installation accuracy of the two cutter heads. The milling head structure has good rigidity, and the cutting force has little effect on tool deformation, which can achieve very good machining accuracy and surface roughness.

[0021] 2. One milling head can be equipped with two cutter heads, and the upper and lower surfaces can be machined simultaneously. The machining is completed in one pass, and with two milling heads, two opposite sets of surfaces can be machined at the same time. The machining efficiency is several times that of traditional methods.

[0022] 3. This invention has good processing accuracy and stability. It adopts fully automatic processing, does not rely on the operator's technical experience, and ensures process stability.

[0023] 4. This invention enables automated processing, eliminating the need for manual measurement and repeated clamping during the process. One person can operate multiple machine tools, effectively reducing production costs. Furthermore, the spindle drive device and feed device are symmetrically arranged on both sides, allowing simultaneous processing of the mounting surfaces on both sides, significantly improving efficiency.

[0024] 5. The planetary carrier clamping and rotating device is installed on the slide table, which can adjust the axial machining position to realize the machining of different types of planetary carriers;

[0025] In summary, the present invention achieves high precision, high efficiency, low processing cost, and high degree of automation in machining the planetary carrier and planetary gear mounting surfaces. Attached image description:

[0026] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ;

[0027] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 ;

[0028] Figure 3 This is a schematic diagram of the milling head structure in this invention;

[0029] Figure 4 This is an exploded view of the milling head structure in this invention;

[0030] Figure 5 This is a schematic diagram of the clamping and rotating device in this invention;

[0031] Figure 6 This is a schematic diagram of the feeding device in this invention;

[0032] Figure 7 This is a schematic diagram of the spindle drive device in this invention;

[0033] Figure 8 This is a schematic diagram of the chip removal and cooling device in this invention;

[0034] Figure 9 This is a schematic diagram of the lubrication device in this invention;

[0035] Figure 10 This is a schematic diagram of the structure of Embodiment 3 of the present invention.

[0036] In the diagram: 1. Chip box; 2. Input gear; 3. Intermediate gear; 4. Output gear; 5. Pressure plate; 6. Input shaft; 7. Three-sided end mill; 8. Base; 9. Mounting base; 10. Servo motor; 11. Motor mount; 12. Ball screw; 13. Guide rail; 14. Slider; 15. Slide table; 16. Milling head; 17. Synchronous pulley; 18. Synchronous belt; 19. Spindle motor; 20. Dovetail slide table; 21. Pressure plate; 22. Hydraulic cylinder; 23. CNC rotary table; 24. Hydraulic chuck; 25. Hydraulic station; 26. Chip conveyor; 27. Cutting fluid pump; 28. Cutting fluid tank; 29. ​​Control panel; 30. Control cabinet; 31. Cutting fluid pipeline; 32. Nozzle; 33. Collection tank; 34. Lubrication pump; 35. Lubricating oil pipeline; 36. Oil distributor; 37. Ball screw nut; 38. Branch oil pipeline; 39. Handwheel; 40. Output shaft; 41. Adjusting shim; 42. Bearing. Detailed implementation method:

[0037] The present invention will be further described below through specific embodiments and in conjunction with the accompanying drawings.

[0038] Example 1:

[0039] like Figure 1-2 As shown, a milling machine tool for planetary carrier planetary gear mounting surface includes a base 8, characterized in that: the base 8 is provided with a mounting seat 9 and a chip removal and cooling device, the mounting seat 9 is provided with a milling head structure, a spindle drive device, a feed device, a clamping and rotating device and a lubrication device, and the spindle drive device is connected to the feed device and the milling head structure respectively.

[0040] Example 2:

[0041] like Figure 3-4 As shown, a milling machine tool for the planetary carrier planetary gear mounting surface is disclosed. The milling head structure includes an input gear 2, an intermediate gear 3 and an output gear 4. The input gear 2 is mounted on an input shaft 6 and is connected to the output gear 4 through the intermediate gear 3. Each end of the output gear 4 is provided with a three-sided milling cutter 7. The distance between the tips of the two three-sided milling cutters 7 is the same as the distance between the upper and lower mounting surfaces of the planetary carrier.

[0042] The output gear 4 is provided with an output shaft 40. The two ends of the output shaft 40 are provided with threads of opposite directions. One side is a right-hand external thread and the other side is a left-hand external thread. The two three-sided milling cutters 7 are respectively a right-hand internal thread on one side and a left-hand internal thread on the other side. The three-sided milling cutters 7 are connected to the output shaft 40 by threads. The output shaft 40 is also provided with an adjusting shim 41, a bearing 42 and a pressure cap 5. The adjusting shim 41 is installed between the three-sided milling cutter 7 and the bearing 42.

[0043] The power of the spindle motor 19 is transmitted to two three-sided milling cutters 7 by using multi-stage gears. The power input shaft 16 of the milling head 16 is not coaxial with the output shaft 40. The cutting diameter of the three-sided milling cutter 7 is slightly larger than the diameter of the planetary gear mounting surface. With this structure, the two three-sided milling cutters 7 can be inserted between the two mounting surfaces for machining, avoiding interference with the planetary carrier parts.

[0044] The pressure cap 5 is equipped with an O-ring, and there is an adjusting shim 41 between the three-sided milling cutter 7 and the bearing 42. By selecting adjusting shims 41 of different thicknesses, the distance between the tips of the upper and lower milling cutter discs can be adjusted to meet the distance requirements of the upper and lower mounting surfaces of different planetary carriers. During machining, the milling head 16 feeds along the radial direction of the planetary carrier and mills the upper and lower mounting surfaces at the same time.

[0045] The three-sided end mill 7 uses replaceable coated inserts, which are easy to replace and maintain. Each cutter head has 8 cutting edges, resulting in high machining efficiency. The distance between the tips of the upper and lower three-sided end mill 7 is designed to be the distance between the upper and lower mounting surfaces of the planetary carrier, completing the machining in one pass and achieving excellent machining accuracy and surface roughness.

[0046] like Figure 7 As shown, the spindle drive device includes a milling head 16 and a spindle motor 19. The milling head structure is installed inside the milling head 16, and two three-sided milling cutters 7 are installed on the outside of the milling head 16. The spindle motor 19 is connected to the input shaft 6 through a transmission mechanism, which includes a synchronous pulley 17 and a synchronous belt 18. The output end of the spindle motor 19 drives the input gear 2 in the milling head 16 to rotate through the synchronous pulley 17 and the synchronous belt 18, thus inputting power to the milling head 16. There are two sets of spindle drive devices, arranged symmetrically on the left and right sides.

[0047] like Figure 6 As shown, the feeding device includes a servo motor 10, a motor base 11, a ball screw 12, a guide rail 13, a slider 14, and a slide table 15. The servo motor 10 is mounted on the motor base 11, and both the motor base 11 and the guide rail 13 are mounted on the mounting base 9. The output end of the servo motor 10 is connected to the ball screw 12 through a coupling. The ball screw 12 is provided with a ball screw nut 37, which is connected to the slide table 15 by bolts. The slider 14 is mounted on the guide rail 13, and both ends of the slide table 15 are slidably connected to the slider 14. The milling head 16 is mounted on the slide table 15, and the slide table 15 is fixed to the slider 14 by bolts. The slide table 15 and the slider 14 can slide on the guide rail 13. The milling head 16 is driven by a feed device consisting of a servo motor 10 and a ball screw 12, which realizes radial feed motion along the planetary carrier. The slide table 15 can be driven by the servo motor 10 through the ball screw 12 to make linear motion on the guide rail 13. There are two sets of feed devices, which are arranged symmetrically on the left and right.

[0048] like Figure 5As shown, the clamping and rotating device includes a dovetail slide 20, a hydraulic cylinder 22, a CNC rotary table 23, and a hydraulic chuck 24. The dovetail slide 20 is bolted to the base 8, the CNC rotary table 23 is mounted on the dovetail slide 20 via a pressure plate 21, and the hydraulic chuck 24 is bolted to the CNC rotary table 23. The hydraulic cylinder 22 is connected to the hydraulic chuck 24 via a hollow shaft and a connecting rod passing through the center hole of the CNC rotary table 23. The planetary carrier is clamped by the hydraulic chuck 24, and the CNC rotary table 23 can automatically rotate. The feed device and milling head 16 are arranged on both sides, enabling simultaneous processing of the mounting surfaces on both sides, greatly improving processing efficiency.

[0049] The hydraulic cylinder 22 is connected to the hydraulic station 25 by a hydraulic pipeline. The solenoid valve on the hydraulic station can control the hydraulic cylinder 22 and thus control the clamping and loosening of the hydraulic chuck 24. The CNC rotary table 23 has a servo motor inside, which can precisely control the rotation of the planetary carrier parts. The dovetail slide 20 is also equipped with a handwheel 39 on one side, which can adjust the processing position of the planetary carrier parts back and forth to adapt to the processing of different types of planetary carriers.

[0050] like Figure 8 As shown, the chip removal and cooling device includes a chip conveyor 26, a cutting fluid pump 27, a cutting fluid tank 28, and a collection tank 33. The collection tank 33 is connected to the chip conveyor 26 via the cutting fluid tank 28. A chip box 1 is provided at the lower end of the outlet of the chip conveyor 26. The cutting fluid pump 27 is connected to a nozzle 32 via a cutting fluid pipeline 31. The nozzle 32 is located on the side of the three-sided end mill 7. During machining, the cutting fluid is pumped out by the cutting fluid pump 27 and sprayed out from the nozzle 32 at the end of the cutting fluid pipeline 31. The two nozzles 32 are respectively aimed at the three-sided end mills on both sides to cool the cutting tools and flush out the chips. The cutting fluid carrying the chips is collected by the collection tank 33 and flows into the cutting fluid tank 28. In the cutting fluid tank 28, solid chips are separated by the chip conveyor 26 and conveyed upwards, finally falling into the chip box 1. When the machine tool is started, the chip removal and cooling device works automatically to achieve automatic cooling and chip removal.

[0051] like Figure 9 As shown, the lubrication device includes a lubrication pump 34 and an oil distributor 36. The lubrication pump 34 is connected to the oil distributor 36 through a lubrication oil pipe 35. The oil distributor 36 is connected to the lubrication nozzles on the milling head 16, the ball screw nut 37 and the slider 14 through branch oil pipes 38 respectively.

[0052] The lubrication pump 34 has an oil tank to store lubricating oil. During the operation of the machine tool, it pumps oil into the lubrication oil pipe 35 at regular intervals and in a measured amount. The lubricating oil flows into the oil distributor 36 through the lubrication oil pipe 35. The lubricating oil is divided into multiple paths by the oil distributor 36 and flows into the lubrication nozzles of the milling head 16, the ball screw nut 37, and the slider 14 through the branch oil pipes 38, respectively, to automatically lubricate the above components.

[0053] The control system consists of an operation panel 29 and a control cabinet 30, which are connected by control lines. The control cabinet 30 is also connected to each servo motor, pump, and solenoid valve by control lines, controlling the coordinated operation of each device to form a fully automatic machine tool. Other parts are the same as in Embodiment 1.

[0054] Example 3:

[0055] In the above embodiments, the mounting surfaces of the slide table 15 and the milling head 16, and the positioning end face of the hydraulic chuck 24 are perpendicular to the horizontal plane. However, another embodiment is that they are arranged parallel to the horizontal plane. Figure 10 The figure shows a schematic diagram of a machine tool structure with a horizontally arranged slide table.

[0056] Example 4:

[0057] In one process, the operator mounts a planetary carrier part between the jaws of a hydraulic chuck 24, with the end face of the part pressed against the positioning end face of the hydraulic chuck 24. The operator presses the start button on the control panel 29, activating the hydraulic cylinder 22, which in turn moves the jaws of the hydraulic chuck 24 to clamp the part. Subsequently, the spindle motor 19 starts, driving the input gear 2 on the milling head 16 via the synchronous pulley 17 and synchronous belt 18 of the transmission mechanism. Through the meshing transmission of the multi-stage intermediate gears 3, the three-sided milling cutter 7 rotates at a given speed. Two servo motors 10 start, driving the ball screw 12 to rotate. The ball screw nut 37 performs linear motion, which in turn drives the slide 15, the milling head 16, and the spindle motor 19 to perform feed motion on the guide rail 13. When the three-sided milling cutter 7 is about to reach the milled surface, the cutting fluid pump 27 is turned on, and the cutting fluid is sprayed out from the nozzle 32. The feed speed is switched from rapid motion to cutting feed, and the machining of the mounting surface begins. When the three-sided milling cutter 7 feeds to the designated position, one set of surfaces is machined. The servo motor 10 reverses, and the milling head 16 returns to the starting position at a rapid motion speed. The CNC rotary table 23 rotates 90 degrees, and the other set of surfaces of the planetary carrier part reaches the machining position. The servo motor 10 starts and repeats the previous action to complete the machining of the other set of surfaces. After all machining is completed, the milling head 16 returns to the safe position, the spindle motor 19 stops, the cutting fluid is turned off, the hydraulic chuck 24 is released, and the operator removes the planetary carrier part to start the next cycle.

Claims

1. A process method for a milling machine tool for a planetary carrier and planetary gear mounting surface, wherein the milling machine tool for a planetary carrier and planetary gear mounting surface comprises a base (8), the base (8) is provided with a mounting seat (9) and a chip removal and cooling device, the mounting seat (9) is provided with a milling head structure, a spindle drive device, a feeding device, a clamping and rotating device and a lubrication device, the spindle drive device is respectively connected to the feeding device and the milling head structure; The milling head structure comprises an input gear (2), an intermediate gear (3) and an output gear (4); the input gear (2) is mounted on an input shaft (6); the input gear (2) is meshed and transmission-connected with the output gear (4) via the intermediate gear (3); and a three-face milling cutter (7) is provided at each end of the output gear (4); The spindle drive device comprises a milling head (16) and a spindle motor (19), the milling head structure is installed in the milling head (16), and two three-face milling cutters (7) are installed outside the milling head (16), and the spindle motor (19) is connected to the input shaft (6) through a transmission mechanism; The feeding device comprises a servo motor (10), a motor seat (11), a ball screw (12), a guide rail (13), a slider (14) and a slide table (15), the servo motor (10) being mounted on the motor seat (11), the motor seat (11) and the guide rail (13) being mounted on the mounting seat (9), the output end of the servo motor (10) being connected to the ball screw (12), the ball screw (12) being provided with a ball screw nut (37), the ball screw nut (37) being connected to the slide table (15), the slider (14) being mounted on the guide rail (13), and both ends of the slide table (15) being slidably connected to the slider (14), and the milling head (16) being mounted on the slide table (15); The clamping and rotating device comprises a dovetail slide (20), a hydraulic cylinder (22), a numerically controlled rotary table (23) and a hydraulic chuck (24); the dovetail slide (20) is mounted on a base (8); the numerically controlled rotary table (23) is mounted on the dovetail slide (20) via a pressure plate (21); the hydraulic chuck (24) is mounted on the numerically controlled rotary table (23); the hydraulic cylinder (22) is connected to the hydraulic chuck (24) via a hollow shaft and a connecting rod passing through a center hole of the numerically controlled rotary table (23); and a hand wheel (39) is further provided on one side of the dovetail slide (20); The chip removal and cooling device comprises a chip conveyor (26), a cutting fluid pump (27), a cutting fluid tank (28) and a fluid collecting tank (33); the fluid collecting tank (33) is connected to the chip conveyor (26) via the cutting fluid tank (28); a chip box (1) is provided at the lower end of the outlet of the chip conveyor (26); the cutting fluid pump (27) is connected to a nozzle (32) via a cutting fluid pipeline (31); and the nozzle (32) is provided on the side of the face and surface milling cutter (7); the device is characterized in that: Specifically include: The operator installs the planetary carrier part between the claws of the hydraulic chuck (24), and the end face of the planetary carrier part is tightly attached to the positioning end face of the hydraulic chuck (24). The operator presses the start button, and the hydraulic cylinder (22) is actuated, driving the claws of the hydraulic chuck (24) to move and clamp the planetary carrier part. Then the spindle motor (19) is started, and the input gear (2) on the milling head (16) is driven through the transmission mechanism, and the three-sided milling cutter (7) is rotated at a given speed through the meshing transmission of the multi-stage intermediate gear (3). The two servo motors (10) are started, driving the ball screw (12) to rotate, and the ball screw nut (37) performs linear motion, and drives the slide (15), the milling head (16) and the spindle motor (19) to perform feed motion on the guide rail (13); when the three-sided milling cutter (7) is rotated at a given speed, the two servo motors (10) are started, driving the ball screw (12) to rotate, and the ball screw nut (37) performs linear motion, and drives the slide (15), the milling head (16) and the spindle motor (19) to perform feed motion on the guide rail (13); when the three-sided milling cutter (7) is rotated at a given speed, the three-sided milling cutter (7) is rotated at a given speed. When the milling cutter (7) is about to reach the milled surface, the cutting fluid pump (27) is turned on, the cutting fluid is sprayed from the nozzle (32), the feed speed is switched from rapid motion to cutting feed, and the mounting surface is processed. When the three-edge milling cutter (7) is fed to the specified position and one set of surfaces is processed, the servo motor (10) is reversed, the milling head (16) returns to the starting position at a rapid motion speed, the CNC rotary table (23) rotates 90 degrees, and another set of surfaces of the planetary carrier part reaches the processing position. The servo motor (10) is started and the previous action is repeated to complete the processing of another set of surfaces. After all the processing is completed, the milling head (16) returns to the safe position, the spindle motor (19) is stopped, the cutting fluid is turned off, the hydraulic chuck (24) is released, and the operator removes the planetary carrier part to start the next cycle.

2. The process method for milling the mounting surface of a planetary carrier and planetary gear according to claim 1, characterized in that: The output gear (4) is provided with an output shaft (40), and both ends of the output shaft (40) are provided with threads of opposite rotation directions. The three-edge milling cutter (7) and the output shaft (40) are connected to each other through threads. The output shaft (40) is also provided with an adjustment pad (41), a bearing (42) and a pressure cover (5), and the adjustment pad (41) is installed between the three-edge milling cutter (7) and the bearing (42).

3. The process method for milling the mounting surface of a planetary carrier and planetary gear according to claim 2, characterized in that: The lubrication device comprises a lubrication pump (34) and an oil separator (36); the lubrication pump (34) is connected to the oil separator (36) via a lubrication oil pipe (35); and the oil separator (36) is respectively connected to lubrication oil nozzles on the milling head (16), the ball screw nut (37) and the slide block (14) via a branch oil pipe (38).

4. The process method for milling the mounting surface of a planetary carrier and planetary gear according to claim 3, characterized in that: The milling head structure, the spindle driving device and the feeding device are each provided with two sets, and are arranged symmetrically on the left and right.

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