A machining apparatus and method for high-precision internal splines on motor shafts

Abstract

This invention discloses a high-precision internal spline machining device and method for motor shafts, comprising a machine tool assembly, which includes a laterally movable tool assembly and a longitudinally movable positioning assembly. The tool assembly includes a horizontally positioned support plate, which in turn includes a horizontally positioned support main plate. The bottom of the support main plate has a strip-shaped support protrusion, and the upper surface of the support main plate has a mounting groove in the center, containing several receiving cavities. The upper surface of the support plate has a detachable multi-hole tool holder. This high-precision internal spline machining device for motor shafts can quickly and efficiently machine splines of different models and parameters, improving spline machining accuracy, thereby reducing costs and labor intensity, facilitating better product quality control, improving product quality stability, and increasing production efficiency.

Description

Technical Field

[0001] This invention relates to a shaft machining equipment, and more specifically, to a high-precision internal spline machining device for motor shafts. Background Technology

[0002] The motor shaft is a crucial component of the motor in an automotive transmission system, driving the rotor within the motor. The mechanical connection of the motor-driven actuator typically employs an internal spline structure. The internal spline serves to transmit torque and bear loads, thus requiring extremely stringent machining quality. Traditional internal spline machining methods struggle to meet customer requirements for tooth surface hardness and machining accuracy, resulting in low production efficiency. Therefore, there is an urgent need to develop a high-precision, automated machining device for motor shaft internal splines.

[0003] The existing internal spline motor shaft adopts an integrated structure of motor shaft body and internal spline. Therefore, the internal spline of the motor shaft is designed as a blind hole structure. The blind hole structure of the internal spline not only has high processing cost and low precision, but also has low tooth surface hardness, low load-bearing capacity and poor wear resistance. This causes early failure and complete tooth damage when customers test under low load. It needs to be improved. Summary of the Invention

[0004] Therefore, it is necessary to provide a machining device for high-precision internal splines of motor shafts to address the aforementioned technical problems.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A high-precision internal spline machining device for motor shafts is characterized in that the device comprises a machine tool assembly, wherein the machine tool assembly is provided with a laterally movable tool assembly and a longitudinally movable positioning assembly.

[0007] The machine tool assembly includes a worktable with a pair of parallel linear guides. Each linear guide has a pair of sliders, and each end of the linear guide has a guide end limit block. A servo motor system is located on one side of each linear guide, and a table servo motor is located at the bottom of the worktable. A cylindrical lifting head is located on the pivot of the table servo motor.

[0008] The cutting tool assembly includes a horizontally arranged support plate, which in turn includes a horizontally arranged support main plate. The bottom of the support main plate has a strip-shaped support ridge. A mounting slot is located in the center of the upper surface of the support main plate, containing several receiving cavities. A pair of main plate screw holes are located on the side wall of the support main plate. A long strip-shaped support bar is located at the bottom of the mounting slot. A detachable multi-hole cutting tool holder is located on the upper surface of the support plate, positioned above the support bar. Both sides of the support plate have longitudinally arranged vertical side plates, each with a vertical slide rail. Each vertical slide rail has a longitudinally sliding support frame. One support frame has a longitudinally arranged tubular feed rack, and the other support frame has a longitudinally arranged tubular take-up rack.

[0009] The positioning component includes four longitudinally arranged guide columns and a pair of longitudinally arranged limiting columns. The top of the guide columns is provided with a horizontally arranged top plate, and the lower surface of the top plate is provided with a detachable workpiece positioning plate. The center of the workpiece positioning plate is provided with an expansion chuck.

[0010] In a preferred embodiment of the present invention, the workbench surface has a through main hole at its center, and four through column fixing holes and a pair of through limit column fixing holes are provided around the circumference of the main hole. A pair of cylindrical support blocks are provided on the upper surface of the workbench surface, and the support blocks are symmetrically distributed around the circumference of the main hole. The guide column cooperates with the column fixing hole, and the limit column cooperates with the limit column fixing hole. The lifting column head penetrates the main hole, and the outer diameter of the lifting column head is adapted to the inner diameter of the main hole.

[0011] In a preferred embodiment of the present invention, the servo motor system includes a pair of screw seats, a drive screw is provided between the screw seats, a drive seat is provided on the drive screw, a plurality of drive seat screw holes are provided on the side wall of the drive seat, the main board screw hole and the drive seat screw hole are connected by screws, and a lead screw servo motor is provided at the end of the drive screw.

[0012] In a preferred embodiment of the present invention, a pair of lateral mounting holes are provided on the side walls at both ends of the supporting protrusion.

[0013] In a preferred embodiment of the present invention, the multi-hole tool holder includes a long strip-shaped holder body. The holder body has several longitudinally arranged tool placement holes and several transversely arranged tool locking square holes. Each side of the tool locking square hole has a locking screw hole. Each tool placement hole has a detachable pusher. Each tool locking square hole has a detachable locking block. The locking block locks the pusher in the tool locking square hole. The side wall of the pusher has a locking groove. The size of the locking groove is adapted to the locking block. The upper surface of the support main board has four positioning protrusions. The bottom of the holder body has four positioning circular grooves. The positioning circular grooves cooperate with the positioning protrusions.

[0014] In a preferred embodiment of the present invention, a top plate hole is provided at each of the four corners of the top plate, and a pad is provided in each of the top plate holes. The guide column passes through the pad, and a detachable workpiece protective sleeve is provided on the lower surface of the workpiece positioning plate.

[0015] A method for machining high-precision internal splines on a motor shaft, comprising the machining apparatus for high-precision internal splines on a motor shaft as described above, and including the following steps:

[0016] S1. Gently place the workpiece into the feed rack and press the start button on the machine tool;

[0017] S2. The lead screw servo motor is working, and the tool assembly moves to the left along the linear guide to the designated position. At this time, the workpiece is located directly below the workpiece positioning plate.

[0018] S3. When the table servo motor is working, the lifting column head passes through the main through hole and presses against the bottom of the support frame of the feeding rack. The workpiece moves upward along the vertical slide rail in the feeding rack to the designated position. At this time, the expansion core chuck of the workpiece positioning plate clamps the workpiece, and the feeding rack moves downward along the vertical slide rail to the original position.

[0019] S4. The lead screw servo motor starts working, and the tool assembly moves to the right along the linear guide to the designated position. At this time, the rightmost first pusher reaches directly below the workpiece.

[0020] S5. The machine tool hydraulic system works, and the workpiece positioning plate moves up and down along the guide column to the preset position to complete one tooth pushing operation. This is repeated until the last tooth pushing operation on the far left is completed, and one cycle is completed. The workpiece positioning plate is then reset.

[0021] S6. The table servo motor works, the lifting column head passes through the main through hole and presses against the bottom of the support frame of the picking rack. The picking rack moves upward along the vertical slide rail to the designated position, the expansion chuck releases the workpiece, the workpiece falls onto the picking rack, and the picking rack moves downward along the vertical slide rail to the original position.

[0022] S7. Remove the processed workpiece;

[0023] S8. Repeat steps S1 to S7 above.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] This invention provides a high-precision internal spline machining device for motor shafts. This high-precision internal spline machining device can quickly and efficiently machine splines of different models and parameters, improve spline machining accuracy, thereby reducing costs and labor intensity, so as to better control product quality, improve product quality stability, and increase production efficiency. Attached Figure Description

[0026] To more clearly illustrate the solutions in this invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a three-dimensional structural schematic diagram of the machining device for high-precision internal splines of the motor shaft according to the present invention;

[0028] Figure 2 for Figure 1 An exploded three-dimensional structural diagram of the machine tool assembly for machining high-precision internal splines on the motor shaft.

[0029] Figure 3 for Figure 1 An exploded three-dimensional structural diagram of the tool assembly of the high-precision internal spline machining device for the motor shaft.

[0030] Figure 4 for Figure 3 A detailed magnified view of region A in the diagram;

[0031] Figure 5 for Figure 3 An exploded three-dimensional structural diagram of the support plate for the tool assembly;

[0032] Figure 6 for Figure 5 An exploded view of the three-dimensional structure of the support plate, presented from another perspective;

[0033] Figure 7 for Figure 6 A cross-sectional view of the support plate along line BB in the middle;

[0034] Figure 8 for Figure 3An exploded three-dimensional structural diagram of the multi-hole tool holder in the tool assembly;

[0035] Figure 9 for Figure 1 An exploded three-dimensional structural diagram of the positioning component of the high-precision internal spline machining device for the motor shaft.

[0036] Figure 10 This is a schematic diagram of the operation of the high-precision internal spline machining device for the motor shaft of the present invention, showing step S1 at this time;

[0037] Figure 11 This is a schematic diagram of the operation of the high-precision internal spline machining device for the motor shaft of the present invention, showing step S2 at this time;

[0038] Figure 12 This is a schematic diagram of the operation of the high-precision internal spline machining device for the motor shaft of the present invention, showing step S3 at this time;

[0039] Figure 13 This is a schematic diagram of the operation of the high-precision internal spline machining device for the motor shaft of the present invention, showing step S4 at this time;

[0040] Figure 14 This is a schematic diagram of the operation of the high-precision internal spline machining device for the motor shaft of the present invention, showing step S5 at this time;

[0041] Figure 15 This is a schematic diagram of the operation of the high-precision internal spline machining device for the motor shaft of the present invention, showing step S6 at this time. Detailed Implementation

[0042] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0043] like Figure 1 As shown, the high-precision internal spline machining device for the motor shaft includes a machine tool assembly 1, which is equipped with a detachable tool assembly 2 and a detachable positioning assembly 3.

[0044] like Figure 2As shown, the machine tool assembly 1 includes a worktable 11, on which a pair of parallel linear guides 12 are provided. Each linear guide 12 is provided with a pair of sliders 14. Each end of the linear guide 12 is provided with a guide rail end limit block 13. A servo motor system 15 is provided on one side of the linear guide 12. The servo motor system 15 includes a pair of screw seats 151. A drive screw 152 is provided between the screw seats 151. A drive seat 153 is provided on the drive screw 152. Four drive seat screw holes 1531 are provided on the side wall of the drive seat 153. A lead screw servo motor 154 is provided at the end of the drive screw 152.

[0045] The workbench surface 11 has a through main hole 110 at its center. Around the circumference of the main hole 110 are four through column fixing holes 111 and a pair of through limiting column fixing holes 112. On the upper surface of the workbench surface 11 are a pair of cylindrical support blocks 113, which are symmetrically distributed around the circumference of the main hole 110.

[0046] The bottom of the worktable 11 is provided with a table servo motor 16. A cylindrical lifting head 161 is provided on the pivot of the table servo motor 16. The lifting head 161 passes through the main through hole 110, and the outer diameter of the lifting head 161 is adapted to the inner diameter of the main through hole 110.

[0047] like Figures 3 to 8 As shown, the tool assembly 2 includes a horizontally arranged support plate 21, which includes a horizontally arranged support main plate 211. The bottom of the support main plate 211 has a strip-shaped support protrusion 212. Each end of the support protrusion 212 has a pair of lateral mounting holes 2121. The upper surface of the support main plate 211 has a mounting groove 213 in the middle, which contains several receiving cavities 215. The upper surface of the support main plate 211 has four positioning protrusions 214. The sidewall of the support main plate 211 has a pair of main plate screw holes 2111. 111 is connected to the drive seat screw hole 1531 by a long rod screw 1532. The bottom of the mounting slot 213 is provided with a long strip support bar 22. The upper surface of the support plate 21 is provided with a separable multi-hole tool fixing seat 23. The multi-hole tool fixing seat 23 is located above the support bar 22. The multi-hole tool fixing seat 23 includes a long strip fixing seat body 230. The fixing seat body 230 is provided with a number of longitudinally arranged tool placement holes 231 and a number of transversely arranged tool locking square holes 232. A locking screw hole 2321 is provided on both sides of the tool locking square hole 232.

[0048] Each tool placement hole 231 is equipped with a detachable pusher 25, and each tool locking square hole 232 is equipped with a detachable locking block 24. The locking block 24 locks the pusher 25 in the tool locking square hole 232. The side wall of the pusher 25 is equipped with a locking groove 251, the size of which is adapted to the locking block 24. The bottom of the fixing base body 230 is equipped with four positioning circular grooves 233, which cooperate with the positioning protrusions 214. Each side of the support plate 21 is equipped with a longitudinally arranged vertical side plate 26, which is fixedly connected to the support plate 21 through the lateral mounting hole 2121. Each vertical side plate 26 is equipped with a vertical slide rail 27, and each vertical slide rail 27 is equipped with a longitudinally sliding support frame 28. One of the support frames 28 is provided with a longitudinally arranged tubular feeding frame 29, and the other support frame 28 is provided with a longitudinally arranged tubular picking frame 30.

[0049] It should be noted that the feed rack 29 and the support frame 28 can be machined as a single piece, or the feed rack 29 can be detachably connected to the support frame 28 via a threaded connection. Similarly, the material handling rack 30 is also made in this manner.

[0050] like Figure 9 As shown, the positioning assembly 3 includes four longitudinally arranged guide columns 31 and a pair of longitudinally arranged limiting columns 33. The guide columns 31 cooperate with the column fixing holes 111, and the limiting columns 33 cooperate with the limiting column fixing holes 112. The top of the guide columns 31 is provided with a horizontally arranged top plate 34. Each of the four corners of the top plate 34 is provided with a top plate hole 341. A pad 32 is provided in each of the top plate holes 341. The guide columns 31 pass through the pad 32. A detachable workpiece positioning plate 35 is provided on the lower surface of the top plate 34. An expansion chuck 351 is provided at the center of the workpiece positioning plate 35. A detachable workpiece protective sleeve 36 is provided on the lower surface of the workpiece positioning plate 35.

[0051] The following describes the working method of the high-precision internal spline machining device for the motor shaft, including the steps:

[0052] S1, such as Figure 10 As shown, gently place workpiece 4 into the designated feed rack 29 and press the start button on the machine tool;

[0053] S2, such as Figure 11 As shown, the lead screw servo motor 154 is working, and the tool assembly 2 moves to the left along the linear guide rail 12 to the designated position. At this time, the workpiece 4 is located directly below the workpiece positioning plate 35.

[0054] S3, the table servo motor 16 operates, the lifting column head 161 penetrates the main through hole 110 and abuts against the bottom of the support frame 28 of the feed rack 29, the workpiece 4 moves upward along the vertical slide rail 27 in the feed rack 29 to the designated position, such as Figure 12 As shown, at this time, the expansion chuck 351 of the workpiece positioning plate 35 clamps the workpiece 4, and the feed rack 29 moves down to the original position along the vertical slide rail 27.

[0055] S4, such as Figure 13 As shown, the lead screw servo motor 154 starts working, and the tool assembly 2 moves to the right along the linear guide rail 12 to the designated position. At this time, the rightmost first pusher 25 reaches directly below the workpiece 4.

[0056] S5. The machine tool hydraulic system operates, and the workpiece positioning plate 35 moves up and down along the guide column 31 to the preset position, completing one tooth-pushing operation. This process is repeated until the last tooth 25 on the far left is completed, completing one cycle. The workpiece positioning plate 35 returns to its original position. Figure 14 As shown;

[0057] S6. The table servo motor 16 operates, the lifting column head 161 penetrates the main through hole 110 and presses against the bottom of the support frame 28 of the picking rack 30. The picking rack 30 moves upward along the vertical slide rail 27 to the designated position. The expansion chuck 351 releases the workpiece 4, and the workpiece 4 falls onto the picking rack 30. Then, the picking rack 30 moves downward along the vertical slide rail 27 back to its original position. Figure 15 ;

[0058] S7. Remove the processed workpiece 4;

[0059] S8. Repeat the above steps to finally achieve the continuous machining process of high-precision internal splines on the motor shaft.

[0060] This high-precision internal spline machining device for motor shafts can quickly and efficiently machine splines of different models and parameters, improving spline machining accuracy, thereby reducing costs and labor intensity, enabling better product quality control, enhancing product quality stability, and increasing production efficiency.

[0061] The machining device for high-precision internal splines on motor shafts is significantly superior to traditional extrusion or gear shaping methods. The motor shaft is easy to clamp and disassemble, meets machining requirements, and ensures the machining needs of high-precision internal splines.

[0062] Not limited to this, any variations or substitutions conceived without inventive effort should be included within the scope of protection of this invention. Therefore, the scope of protection of this invention should be determined by the scope defined in the claims.

Claims

1. A method for machining high-precision internal splines on a motor shaft, comprising a machining apparatus for high-precision internal splines on a motor shaft, and including the following steps: S1. Gently place the workpiece (4) into the feed rack (29) and press the start button on the machine tool; S2, the lead screw servo motor (154) works, the tool assembly (2) moves to the left along the linear guide (12) to the designated position, at which time the workpiece (4) is located directly below the workpiece positioning plate (35); S3, the table servo motor (16) works, the lifting column head (161) passes through the main through hole (110) and presses against the bottom of the support frame (28) of the feed rack (29), the workpiece (4) moves upward along the vertical slide rail (27) in the feed rack (29) to the designated position, at this time, the expansion core chuck (351) of the workpiece positioning plate (35) clamps the workpiece (4), and the feed rack (29) moves downward along the vertical slide rail (27) to the original position; S4, the lead screw servo motor (154) starts working, and the tool assembly (2) moves to the right along the linear guide (12) to the designated position. At this time, the rightmost first pusher (25) reaches directly below the workpiece (4). S5. The machine tool hydraulic system is working. The workpiece positioning plate (35) moves up and down along the guide column (31) to the preset position to complete one tooth pushing operation. This is repeated until the last pusher (25) on the far left is completed. One cycle of operation is completed and the workpiece positioning plate (35) is reset. S6, the table servo motor (16) works, the lifting column head (161) passes through the main through hole (110) and presses against the bottom of the support frame (28) of the picking rack (30), the picking rack (30) moves upward along the vertical slide rail (27) to the designated position, the expansion core chuck (351) releases the workpiece (4), the workpiece (4) falls into the picking rack (30), and the picking rack (30) moves downward along the vertical slide rail (27) to the original position; S7. Take out the processed workpiece (4); S8. Repeat steps S1 to S7 above; in, The high-precision internal spline machining device for the motor shaft includes a machine tool assembly (1), on which a tool assembly (2) that can move laterally and a positioning assembly (3) that can move longitudinally are provided. The machine tool assembly (1) includes a worktable (11), on which a pair of parallel linear guides (12) are provided. Each of the linear guides (12) is provided with a pair of sliders (14). Each of the two ends of the linear guides (12) is provided with a guide rail end limit block (13). A servo motor system (15) is provided on one side of the linear guides (12). A table servo motor (16) is provided at the bottom of the worktable (11). A cylindrical lifting head (161) is provided on the pivot of the table servo motor (16). The tool assembly (2) includes a horizontally arranged support plate (21), the support plate (21) includes a horizontally arranged support main plate (211), the bottom of the support main plate (211) is provided with a strip-shaped support protrusion (212), the middle of the upper surface of the support main plate (211) is provided with a mounting slot (213), the mounting slot (213) is provided with a plurality of receiving cavities (215), the side wall of the support main plate (211) is provided with a pair of main plate screw holes (2111), the bottom of the mounting slot (213) is provided with a long strip-shaped support bar (22), the support plate (21) has a separable multi-hole tool holder (23) on its upper surface. The multi-hole tool holder (23) is located above the support bar (22). Both sides of the support plate (21) have a longitudinally arranged vertical side plate (26). Each vertical side plate (26) has a vertical slide rail (27). Each vertical slide rail (27) has a longitudinally sliding support frame (28). One of the support frames (28) has a longitudinally arranged tubular feed rack (29), and the other support frame (28) has a longitudinally arranged tubular take-up rack (30). The positioning component (3) includes four longitudinally arranged guide columns (31) and a pair of longitudinally arranged limiting columns (33). The top of the guide columns (31) is provided with a horizontally arranged top plate (34). The lower surface of the top plate (34) is provided with a detachable workpiece positioning plate (35). The center of the workpiece positioning plate (35) is provided with an expansion chuck (351). The center of the worktable (11) is provided with a through main hole (110). The circumference of the main hole (110) is provided with four through column fixing holes (111) and a pair of through limiting column fixing holes (112). The upper surface of the worktable (11) is provided with a pair of cylindrical support blocks (113). Support blocks (113) are symmetrically distributed around the main through hole (110). The guide column (31) is matched with the column fixing hole (111). The limiting column (33) is matched with the limiting column fixing hole (112). The lifting column head (161) penetrates the main through hole (110), and the outer diameter of the lifting column head (161) is adapted to the inner diameter of the main through hole (110). The servo motor system (15) includes a pair of screw seats (151). A drive screw (152) is provided between the screw seats (151). A drive seat (153) is provided on the drive screw (152). Several drive seat screw holes are provided on the side wall of the drive seat (153). (1531), the main board screw hole (2111) and the drive seat screw hole (1531) are connected by screws. The end of the drive screw (152) is provided with a screw servo motor (154). Both ends of the support convex strip (212) are provided with a pair of lateral mounting holes (2121). The multi-hole tool holder (23) includes a long strip-shaped holder body (230). The holder body (230) is provided with a number of longitudinally arranged tool placement holes (231) and a number of transversely arranged tool locking square holes (232). Both sides of the tool locking square hole (232) are provided with a locking screw hole (2321). Each tool placement hole (231) is provided with a detachable screw. The pusher (25) is provided with a detachable locking block (24) in the tool locking square hole (232). The locking block (24) locks the pusher (25) in the tool locking square hole (232). The pusher (25) has a locking groove (251) on its side wall. The size of the locking groove (251) is adapted to the locking block (24). The upper surface of the support main board (211) has four positioning protrusions (214). The bottom of the fixed base body (230) has four positioning circular grooves (233). The positioning circular grooves (233) cooperate with the positioning protrusions (214). The top plate (34) has a top plate hole (341) at each of its four corners.Each of the top plate holes (341) is provided with a gasket (32), the guide column (31) passes through the gasket (32), and the lower surface of the workpiece positioning plate (35) is provided with a removable workpiece protective sleeve (36).

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