Numerical control machine tool for machining bearing outer rings

Abstract

The application discloses a numerical control machine tool for machining bearing outer rings, which comprises a rack, a rectangular slot-shaped machining slot arranged on the rack, a bearing outer ring conveying device, a horizontal stepping conveying device, a bearing outer ring clamping and rotating device and a turning tool device. The bearing outer ring clamping and rotating device comprises an outer cylindrical surface clamping mechanism and an inner cylindrical surface clamping mechanism. The outer cylindrical surface clamping mechanism clamps the bearing outer ring by clamping the outer cylindrical surface of the bearing outer ring. The inner cylindrical surface clamping mechanism clamps the bearing outer ring by clamping the inner cylindrical surface of the bearing outer ring. The bearing outer ring conveying device is used for feeding the bearing outer ring into and out of the numerical control machine tool. The horizontal stepping conveying device is used for conveying the bearing outer ring between the bearing outer ring conveying device, the outer cylindrical surface clamping mechanism and the inner cylindrical surface clamping mechanism. The turning tool device is used for turning the bearing outer rings on the outer cylindrical surface clamping mechanism and the inner cylindrical surface clamping mechanism. The outer diameter of the bearing outer ring is machined at one time, which is beneficial to improving the machining efficiency.

Description

Technical Field

[0001] This application relates to the field of CNC machine tools, and more particularly to a CNC machine tool for machining the outer ring of a bearing. Background Technology

[0002] Bearings are an important component in modern mechanical equipment. Their main function is to support rotating parts of the machine, reduce the coefficient of friction during movement, and ensure rotational accuracy. A bearing consists of an outer ring, an inner ring, rolling elements, and a cage.

[0003] In the machining process of bearing outer rings, turning accounts for about one-third of the total machining. Both the inner and outer cylindrical surfaces of the bearing outer ring need to be turned. After turning, the bearing outer ring must not only meet the forming requirements, but also create conditions for subsequent machining. The quality of turning directly affects the quality, efficiency, and economic benefits of grinding.

[0004] When machining the outer ring of a bearing, the inner diameter of the outer ring is machined first, followed by the outer diameter. Generally, turning is performed on a CNC machine tool. During machining, a three-jaw chuck holds the bearing outer ring blank for machining. This allows the inner diameter of the outer ring to be machined in one pass. However, because the jaws of the three-jaw chuck abut against the outer cylindrical surface of the bearing outer ring blank, the outer diameter cannot be machined in one pass, resulting in low machining efficiency. Summary of the Invention

[0005] To address the issue of improving machining efficiency, this application provides a CNC machine tool for machining the outer ring of bearings.

[0006] The CNC machine tool for machining bearing outer rings provided in this application adopts the following technical solution:

[0007] A CNC machine tool for machining bearing outer rings includes a frame; the frame is provided with a rectangular machining groove; it includes a bearing outer ring conveying device, a horizontal stepping conveying device, a bearing outer ring clamping and rotating device, and a turning tool device; the bearing outer ring clamping and rotating device includes an outer cylindrical surface clamping mechanism and an inner cylindrical surface clamping mechanism; the outer cylindrical surface clamping mechanism clamps the bearing outer ring through its outer cylindrical surface; the inner cylindrical surface clamping mechanism clamps the bearing outer ring through its inner cylindrical surface; the bearing outer ring conveying device is used for the bearing outer ring to enter and exit the CNC machine tool; the horizontal stepping conveying device is used to drive the bearing outer ring to be conveyed between the bearing outer ring conveying device, the outer cylindrical surface clamping mechanism, and the inner cylindrical surface clamping mechanism; the turning tool device is used to turn the bearing outer ring on the outer cylindrical surface clamping mechanism and the inner cylindrical surface clamping mechanism.

[0008] By adopting the above technical solution, when the outer cylindrical surface clamping mechanism clamps the outer ring of the bearing, the turning tool device processes the inner diameter of the outer ring of the bearing; when the inner cylindrical surface clamps the outer ring of the bearing, the turning tool device processes the outer diameter of the outer ring of the bearing. This is beneficial to improving processing efficiency, and at the same time, the outer diameter processing is based on the completed inner diameter processing, which is beneficial to improving processing accuracy.

[0009] Optionally, the outer cylindrical surface clamping mechanism includes an outer cylindrical surface three-jaw chuck; the inner cylindrical surface clamping mechanism includes an inner cylindrical surface three-jaw chuck; the outer cylindrical surface three-jaw chuck is rotatably connected to one vertical sidewall of the machining groove and the three jaws abut against the outer cylindrical surface of the bearing outer ring; the inner cylindrical surface three-jaw chuck is rotatably connected to another vertical sidewall of the machining groove and the three jaws abut against the inner cylindrical surface of the bearing outer ring; the axes of the outer cylindrical surface three-jaw chuck and the inner cylindrical surface three-jaw chuck are coaxial.

[0010] By adopting the above technical solutions, the outer cylindrical three-jaw chuck and the inner cylindrical three-jaw chuck can be used as existing three-jaw chucks, so the structure is relatively simple and the cost is low.

[0011] Optionally, the turning tool device includes a turning support base, a pair of turning tool mechanisms horizontally movable on the turning support base, and a turning drive mechanism for driving the pair of turning tool mechanisms to move synchronously away from or towards each other; the turning tool mechanism includes a turning support seat, a tool holder horizontally movable on the upper surface of the turning support seat, a turning feed assembly for driving the tool holder to move horizontally, and a plurality of turning tools fixed on the tool holder; the turning tools are used to turn the inner or outer diameter of the bearing outer ring.

[0012] By adopting the above technical solution, after the turning feed assembly drives the tool holder to move horizontally a certain distance, the turning drive mechanism is used to drive a pair of turning tool mechanisms to move away or closer simultaneously, so that the inner diameter and outer diameter of the bearing outer ring can be turned at the same time, which is beneficial to improving turning efficiency.

[0013] Optionally, the bearing outer ring clamping and rotating device further includes a clamping seat rotatably connected to the machining groove; the outer cylindrical surface clamping mechanism includes three radially movable outer jaws evenly distributed around the circumference on the clamping seat and an outer jaw drive assembly for driving the three outer jaws to move radially synchronously; the inner cylindrical surface clamping mechanism includes three radially movable inner jaw seats evenly distributed around the circumference on the clamping seat, an inner jaw seat drive assembly for driving the three inner jaw seats to move radially synchronously, three inner jaws telescopically disposed on the inner jaw seats, and an inner jaw telescopic mechanism assembly for driving the inner jaws to telescopically extend and retract; the inner jaws correspond one-to-one with the inner jaw seats.

[0014] By adopting the above technical solution, the outer cylindrical surface clamping mechanism and the inner cylindrical surface clamping mechanism are located in the same process. In this way, when machining the inner and outer cylindrical surfaces of the bearing outer ring, the bearing outer ring does not need to be moved, thus reducing errors and improving machining accuracy.

[0015] Optionally, the turning tool device includes a turning support base, a turning tool mechanism horizontally movably disposed on the turning support base, and a turning drive mechanism for driving the turning tool mechanism to move horizontally; the turning tool mechanism includes a turning support seat, a tool holder horizontally movably disposed on the upper end surface of the turning support seat, a turning feed assembly for driving the tool holder to move horizontally, and a plurality of turning tools fixed on the tool holder; the turning tools are used to turn the inner or outer diameter of the bearing outer ring.

[0016] By adopting the above technical solution, only one tool holder is required, thereby reducing equipment costs.

[0017] Optionally, the horizontal stepping conveyor includes a horizontal support plate disposed in the processing groove, a hollow square seat-shaped central support base horizontally rotatably connected to the lower end face of the horizontal support plate at a 90-degree angle, a horizontal rotation mechanism for driving the central support base, four gripping seats horizontally telescopically disposed on the central support base, and a horizontal telescopic drive mechanism for driving the four gripping seats to synchronously telescopically extend and retract horizontally; the four gripping seats correspond one-to-one with the four vertical end faces of the central support base; each gripping seat includes an adsorption plate located outside the central support base; the end face of the adsorption plate away from the central support base is formed with a cylindrical groove-shaped adsorption slot for horizontal insertion of one end of the bearing outer ring; the inner cylindrical surface of the adsorption slot is formed with a plurality of circumferentially uniform negative pressure holes; the negative pressure holes are connected to an external air extraction device.

[0018] By adopting the above technical solution, when the adsorption plate approaches the central support, the horizontal rotation mechanism drives the central support to rotate on the horizontal surface, thus preventing interference; when the outer ring of the bearing enters the adsorption slot, the external air extraction device is activated to generate suction at the negative pressure hole, thereby adsorbing the outer ring of the bearing, thus making the structure simple.

[0019] Optionally, the horizontal support plate is vertically raised and lowered within the processing groove; the top of the frame is provided with a lifting drive mechanism for driving the horizontal support plate to rise and fall vertically.

[0020] By adopting the above technical solution, when the lifting drive mechanism drives the horizontal support plate to rise, the turning tool device will not interfere with the horizontal stepping conveyor during subsequent turning, thereby improving the service life of the product.

[0021] Optionally, the bearing outer ring conveying device includes a bearing outer ring conveying guide rail, a limiting mechanism, and a horizontal pushing mechanism fixed on the side wall of the processing groove away from the opening; the limiting mechanism is disposed in the middle of the bearing outer ring conveying guide rail and is used to limit the bearing outer ring; the horizontal pushing mechanism is used to push the bearing outer ring limited by the limiting mechanism into the adsorption slot of the gripping seat on the corresponding side or to bring the bearing outer ring in the adsorption slot of the gripping seat on the corresponding side back to the bearing outer ring conveying guide rail.

[0022] By adopting the above technical solution, the gripper seat can be used in conjunction with the horizontal pushing mechanism to complete the loading and unloading of the gripper seat, which is beneficial for the transmission of the bearing outer ring.

[0023] Optionally, the horizontal pushing mechanism includes a cylindrical intermediate post that is horizontally inserted into the side wall of the machining groove away from the opening and matches the inner diameter of the outer ring of the bearing, an intermediate driving assembly for driving the intermediate post to move horizontally, an annular outer ring that is coaxially and horizontally sleeved on the intermediate post, and an outer driving assembly for driving the outer ring to move horizontally.

[0024] By adopting the above technical solution, the intermediate insert is used to insert into the outer ring of the bearing, and the outer ring is used to remove the outer ring of the bearing from the intermediate insert, which is beneficial for loading and unloading the outer ring of the bearing.

[0025] Optionally, the inner end of the intermediate insert is equipped with several circumferentially evenly distributed spring plungers.

[0026] By adopting the above technical solution, the presence of the spring plunger makes the bearing outer ring more stable when it is fitted onto the intermediate insert, reducing the possibility of the bearing outer ring accidentally falling off and facilitating the transmission of the bearing outer ring.

[0027] In summary, the beneficial effects of this application are as follows:

[0028] 1. The outer diameter of the bearing outer ring is machined in one go, which helps to improve machining efficiency. At the same time, the machining of the outer diameter is based on the completed inner diameter machining, which helps to improve machining accuracy.

[0029] 2. Simultaneously machining the inner and outer diameters of the bearing outer ring helps improve machining efficiency. Attached Figure Description

[0030] Figure 1 This is a partial cross-sectional structural schematic diagram of Embodiment 1 of this application.

[0031] Figure 2 This is a cross-sectional structural diagram of the bearing outer ring conveying device 20 and the frame 10 of this application.

[0032] Figure 3 This is a cross-sectional structural diagram of the horizontal pushing mechanism of this application.

[0033] Figure 4 This is a cross-sectional structural schematic diagram of the horizontal stepping conveyor 30 of this application.

[0034] Figure 5 This application is Figure 4 A schematic diagram of the cross-section of AA.

[0035] Figure 6 This is a partial cross-sectional structural diagram of Embodiment 2 of this application.

[0036] Figure 7 This is a front view structural schematic diagram of the bearing outer ring clamping and rotating device 60 of Embodiment 2 of this application.

[0037] Figure 8 This application is Figure 7 A schematic diagram of the cross-section of BB.

[0038] Explanation of reference numerals in the attached figures:

[0039] 10. Frame; 100. Machining slot; 11. Electric cylinder fixing plate; 12. Horizontal support rod; 13. Vertical support plate;

[0040] 20. Bearing outer ring conveying device; 21. Bearing outer ring conveying guide rail; 211. Upper inclined guide rail; 212. Vertical guide rail; 213. Lower inclined guide rail; 22. Upper limit electric cylinder; 23. Upper limit insert plate; 24. Lower limit electric cylinder; 25. Lower limit insert plate; 26. Intermediate insert post; 261. Intermediate drive electric cylinder; 262. Spring plunger; 27. Outer ring; 271. Outer drive electric cylinder;

[0041] 30. Horizontal stepping conveyor; 31. Lifting drive cylinder; 32. Horizontal support plate; 33. Horizontal rotary motor; 34. Central support seat; 341. Guide plate; 35. Horizontal telescopic drive motor; 36. Horizontal telescopic drive cam; 37. Gripping seat; 371. Gripping inner guide rod; 372. Gripping connecting rod; 373. Adsorption plate; 3730. Adsorption slot; 3731. Negative pressure hole; 38. Abutment spring;

[0042] 40. Three-jaw chuck with an outer cylindrical surface;

[0043] 50. Turning tool assembly; 51. Turning support base; 510. First moving slot; 52. Turning drive motor; 53. Turning drive screw; 54. Turning support seat; 540. Second moving slot; 55. Turning feed screw; 56. Tool holder; 57. Turning tool;

[0044] 60. Bearing outer ring clamping and rotating device; 61. Clamping center column; 62. Clamping drive support plate; 63. Clamping main seat; 630. Outer jaw moving guide groove; 631. Inner jaw seat moving guide groove; 64. Outer jaw; 641. Outer jaw drive screw; 642. Outer jaw driven bevel gear; 65. Inner jaw seat; 650. Vertical telescopic groove; 651. Inner jaw seat drive screw; 652. Inner jaw seat drive bevel gear; 653. 654. Inner chuck; 66. Inner chuck telescopic electric cylinder; 67. Outer chuck drive ring; 68. Outer chuck drive bevel gear; 69. Outer chuck drive motor; 60. Outer chuck drive gear; 61. Inner chuck seat drive ring; 62. Inner chuck seat drive bevel gear; 63. Inner chuck seat connecting sleeve; 64. Inner chuck seat drive gear ring; 65. Inner chuck seat drive motor; 66. Inner chuck seat drive gear.

[0045] 70. Three-jaw chuck with inner cylindrical surface. Detailed Implementation

[0046] The following is in conjunction with the appendix Figures 1-8 This application will be described in further detail.

[0047] Embodiment 1 discloses a CNC machine tool for machining the outer ring of a bearing, with reference to... Figure 1 The machine tool includes a frame 10, a bearing outer ring conveying device 20, a horizontal stepping conveyor 30, a bearing outer ring clamping and rotating device 60, and a turning tool device 50. The frame 10 is provided with a rectangular groove-shaped machining slot 100. The bearing outer ring clamping and rotating device 60 includes an outer cylindrical surface clamping mechanism and an inner cylindrical surface clamping mechanism. The outer cylindrical surface clamping mechanism clamps the bearing outer ring through the outer cylindrical surface of the bearing outer ring. The inner cylindrical surface clamping mechanism clamps the bearing outer ring through the inner cylindrical surface of the bearing outer ring. The bearing outer ring conveying device 20 is used for the bearing outer ring to enter and exit the CNC machine tool. The horizontal stepping conveyor 30 is used to drive the bearing outer ring to be conveyed between the bearing outer ring conveying device 20, the outer cylindrical surface clamping mechanism, and the inner cylindrical surface clamping mechanism. The turning tool device 50 is used to turn the bearing outer ring on the outer cylindrical surface clamping mechanism and the inner cylindrical surface clamping mechanism.

[0048] refer to Figure 1 and Figure 2The bearing outer ring conveying device 20 includes a bearing outer ring conveying guide rail 21 fixed on the side wall of the processing groove 100 away from the opening, a limiting mechanism, and a horizontal pushing mechanism; the cross-section of the bearing outer ring conveying guide rail 21 is a rectangle with an inverted T-shaped opening formed on the end face near the opening of the processing groove 100; the bearing outer ring conveying guide rail 21 includes an upper inclined guide rail 211, a vertical guide rail 212, and a lower inclined guide rail 213; the upper inclined guide rail 211 and the lower inclined guide rail 213 are respectively inclined and their inclination directions are parallel; the upper end of the vertical guide rail 212 is connected to the lower end of the upper inclined guide rail 211, and the lower end is connected to the upper end of the lower inclined guide rail 213.

[0049] refer to Figure 1 and Figure 2 The limiting mechanism includes an upper limit assembly and a lower limit assembly. The upper limit assembly includes an upper limit electric cylinder 22 and an upper limit insert plate 23 fixed on the piston rod of the upper limit electric cylinder 22. The upper limit insert plate 23 is vertically inserted through the lower part of the upper inclined guide rail 211, and the direction of the piston rod of the upper limit electric cylinder 22 is perpendicular to the direction of the upper inclined guide rail 211. The lower limit assembly includes a lower limit electric cylinder 24 and a lower limit insert plate 25 fixed on the piston rod of the lower limit electric cylinder 24. The lower limit insert plate 25 is vertically inserted through the lower limit electric cylinder 24. The piston rod of the lower limit electric cylinder 24 is set perpendicular to the direction of the vertical guide rail 212 at the upper part of the vertical guide rail 212. During operation, the outer ring of the bearing between the upper limit insert plate 23 and the lower limit insert plate 25 is tangent to the upper limit insert plate 23 and the lower limit insert plate 25, respectively. A pair of electric cylinder fixing plates 11 are formed on the side wall of the machining groove 100 away from the opening. The upper limit electric cylinder 22 is fixed on one of the electric cylinder fixing plates 11. The lower limit electric cylinder 24 is fixed on the other electric cylinder fixing plate 11.

[0050] refer to Figure 2 and Figure 3 The horizontal pushing mechanism includes a cylindrical intermediate post 26 that is horizontally inserted on the side wall of the machining groove 100 away from the opening and matches the inner diameter of the outer ring of the bearing; an intermediate drive assembly for driving the intermediate post 26 to move horizontally; an annular outer ring 27 that is coaxially and horizontally sleeved on the intermediate post 26; and an outer drive assembly for driving the outer ring 27 to move horizontally. The outer ring conveying guide rail 21 of the bearing has a clearance hole formed on the side wall away from the opening of the machining groove 100 for the intermediate post 26 and the outer ring 27 to pass horizontally. The outer ring 27 and the intermediate post 26 are located between the upper limit plate 23 and the lower limit plate 25.

[0051] refer to Figure 2 and Figure 3Four rectangular horizontal support rods 12 are vertically fixed on the back of the frame 10; a vertical support plate 13 is formed at the end of the four horizontal support rods 12 away from the frame 10; the intermediate drive assembly includes an intermediate drive electric cylinder 261 fixed on the vertical support plate 13; and an intermediate insert 26 is coaxially fixed on the piston rod of the intermediate drive electric cylinder 261.

[0052] refer to Figure 2 and Figure 3 The external drive assembly includes a pair of external drive electric cylinders 271 that are fixed to the back of the frame 10 and are distributed vertically; an outer ring 27 is fixed to the piston rod of one of the external drive electric cylinders 271.

[0053] To increase the stability of the bearing outer ring fitted on the intermediate insert 26, refer to Figure 3 Several circumferentially evenly distributed spring plungers 262 are installed on the inner end of the middle insert 26.

[0054] refer to Figure 1 , Figure 4 and Figure 5 The horizontal stepping conveyor 30 includes a horizontal support plate 32 vertically lifted and lowered in the processing groove 100, a lifting drive mechanism for driving the horizontal support plate 32 to rise and fall vertically, a hollow square seat-shaped central support base 34 horizontally rotatably connected to the lower end face of the horizontal support plate 32 at a 90-degree angle, a horizontal rotation mechanism for driving the central support base 34, four gripping seats 37 horizontally telescopically mounted on the central support base 34, and a horizontal telescopic drive mechanism for driving the four gripping seats 37 to synchronously telescopically extend and retract horizontally; the four gripping seats 37 correspond one-to-one with the four vertical end faces of the central support base 34.

[0055] refer to Figure 1 , Figure 4 and Figure 5 The lifting drive mechanism includes a pair of lifting drive electric cylinders 31 fixed to the top of the frame 10; a horizontal support plate 32 is fixed to the lower end of the piston rod of the pair of lifting drive electric cylinders 31.

[0056] refer to Figure 1 , Figure 4 and Figure 5The gripping seat 37 includes a vertically arranged cylindrical inner gripping guide rod 371, a gripping connecting rod 372 vertically formed on the inner gripping guide rod 371, and a cylindrical suction plate 373 formed on the end of the gripping connecting rod 372 away from the inner gripping guide rod 371. The upper and lower side walls of the central support seat 34 are respectively formed with four sets of guide groups. The guide group includes a pair of parallel guide plates 341. The upper end of the inner gripping guide rod 371 is located between the pair of guide plates 341 of the upper guide group, and the lower end is located between the pair of guide plates of the lower guide group. Between 341; the gripping connecting rod 372 passes horizontally through the side wall of the corresponding side of the central support 34; the adsorption plate 373 is located on the outside of the central support 34; a cylindrical groove-shaped adsorption slot 3730 is formed on the end face of the adsorption plate 373 away from the central support 34 for horizontal insertion of one end of the bearing outer ring; several circumferentially uniform negative pressure holes 3731 are formed on the inner cylindrical surface of the adsorption slot 3730; the negative pressure holes 3731 are connected to the external air extraction device; the axial depth of the adsorption slot 3730 is less than the axial length of the bearing outer ring.

[0057] refer to Figure 4 and Figure 5 The horizontal telescopic drive mechanism includes a horizontal telescopic drive motor 35 fixed on the lower end surface of the central support 34, a horizontal telescopic drive cam 36 coaxially fixed on the output shaft of the horizontal telescopic drive motor 35, and four abutment springs 38. The horizontal telescopic drive cam 36 is located inside the central support 34, and four gripping inner guide rods 371 abut against the side surface of the horizontal telescopic drive cam 36. The abutment springs 38 correspond one-to-one with the gripping connecting rods 372. The abutment springs 38 are sleeved on the corresponding gripping connecting rods 372. The inner end of the abutment spring 38 abuts against the gripping inner guide rod 371, and the outer end abuts against the side wall of the corresponding side of the central support 34. The horizontal telescopic drive motor 35 is a servo motor.

[0058] refer to Figure 4 The horizontal rotation mechanism includes a horizontal rotation motor 33 fixed on the upper surface of the horizontal support plate 32; the horizontal rotation motor 33 is set to rotate intermittently at equal angles of ninety degrees; and the central support seat 34 is fixed on the lower end of the output shaft of the horizontal rotation motor 33.

[0059] refer to Figure 1The outer cylindrical surface clamping mechanism includes an outer cylindrical surface three-jaw chuck 40; the outer cylindrical surface three-jaw chuck 40 is located near the upper end of the bearing outer ring conveying guide rail 21; the inner cylindrical surface clamping mechanism includes an inner cylindrical surface three-jaw chuck 70; the inner cylindrical surface three-jaw chuck 70 is located near the lower end of the bearing outer ring conveying guide rail 21; the structures of the inner cylindrical surface three-jaw chuck 70 and the outer cylindrical surface three-jaw chuck 40 are the same as those of existing three-jaw chucks, and their rotation is driven by a motor; the outer cylindrical surface three-jaw chuck 40 is rotatably connected to one vertical side wall of the machining groove 100, and the three jaws abut against the outer cylindrical surface of the bearing outer ring; the inner cylindrical surface three-jaw chuck 70 is rotatably connected to another vertical side wall of the machining groove 100, and the three jaws abut against the inner cylindrical surface of the bearing outer ring; the axes of the outer cylindrical surface three-jaw chuck 40 and the inner cylindrical surface three-jaw chuck 70 are coaxially arranged.

[0060] refer to Figure 1 The turning tool device 50 includes a turning support base 51, a pair of turning tool mechanisms horizontally movable on the turning support base 51, and a turning drive mechanism for driving the pair of turning tool mechanisms to move away from or towards each other synchronously; the turning tool mechanism includes a turning support 54, a tool holder 56 horizontally movable on the upper end face of the turning support 54, a turning feed assembly for driving the tool holder 56 to move horizontally, and a plurality of turning tools 57 fixed on the tool holder 56; the turning tools 57 are used to turn the inner or outer diameter of the outer ring of the bearing.

[0061] refer to Figure 1 The upper surface of the turning support base 51 is formed with a first moving groove 510 for a pair of turning support seats 54 to move horizontally; the turning drive mechanism includes a turning drive screw 53 rotatably connected between a pair of vertical parts of the first moving groove 510 and a turning drive motor 52 fixed on the turning support base 51; the turning drive motor 52 is a servo motor; the turning drive screw 53 is coaxially fixedly connected to the output shaft of the turning drive motor 52; the two ends of the turning drive screw 53 are formed with external threads with opposite directions; the bottom surfaces of the pair of turning support seats 54 are slidably disposed on the bottom surface of the first moving groove 510 and are respectively screwed onto different external thread portions of the turning drive screw 53.

[0062] refer to Figure 1 The upper surface of the turning support 54 is formed with a second moving groove 540; the bottom of the tool holder 56 is formed with a tool holder drive block that mates with the second moving groove 540; the turning feed assembly includes a turning feed screw 55 rotatably connected between a pair of opposing side walls of the second moving groove 540 and a turning feed motor fixed on the turning support 54; the turning feed motor is a servo motor; the turning feed screw 55 is coaxially and fixedly connected to the output shaft of the turning feed motor; the tool holder drive block is screwed onto the turning feed screw 55.

[0063] The working principle of a CNC machine tool for machining bearing outer rings, as described in Example 1:

[0064] The outer ring of the bearing slides down the upper inclined guide rail 211 onto the lower limit plate 25; then the four gripping seats 37 extend synchronously, and the intermediate drive cylinder 261 drives the intermediate insert 26 to extend and insert into the adsorption slot 3730 of the corresponding gripping seat 37. During this process, the intermediate insert 26 passes through the outer ring of the bearing. Then, a pair of external drive cylinders 271 drive the outer ring 27 to extend, so that the end of the outer ring of the bearing is inserted into the adsorption slot 3730. At this time, the external air extraction device works, so that the negative pressure hole 3731 generates suction to hold the outer ring of the bearing. Then, the horizontal rotation motor 33 drives the central support seat 34 to rotate 90 degrees, so that the outer ring of the bearing faces the external cylindrical three-jaw chuck 40. Then, the four gripping seats 37 extend synchronously, and then the three jaws of the external cylindrical three-jaw chuck 40 grasp the outer ring of the bearing. Then, the turning tool device 50 turns the bearing. The inner diameter of the bearing outer ring is then determined. Following the above principle, the bearing outer ring is transferred to the inner cylindrical three-jaw chuck 70, and the outer diameter of the bearing outer ring is machined by the turning tool device 50. During this process, the turning tool device 50 also simultaneously machines the inner diameter of another bearing outer ring. Next, according to the above principle, the bearing outer ring returns to face the intermediate insert 26. Then, the intermediate drive cylinder 261 drives the intermediate insert 26 to extend and insert into the suction slot 3730 of the opposite gripping seat 37. During this process, the intermediate insert 26 passes through the bearing outer ring and is held by the spring plunger 262 at the end of the intermediate insert 26. Then, the intermediate insert 26 returns to its original position, driving the bearing outer ring to return as well. During this process, the bearing outer ring contacts the outer ring 27 and disengages from the intermediate insert 26. Finally, the bearing outer ring rolls out along the vertical guide rail 212 and the downward inclined guide rail 213.

[0065] Example 2: The difference between Example 2 and Example 1 is as follows: (Refer to...) Figures 6-8 The outer cylindrical surface clamping mechanism and the inner cylindrical surface clamping mechanism of the bearing outer ring clamping and rotating device 60 are on the same side and are different; there is only one turning tool mechanism and the external threads of the turning drive screw 53 that drives the turning tool mechanism to move horizontally are all in the same helical direction.

[0066] refer to Figure 7 and Figure 8The outer ring clamping and rotating device 60 of the reference bearing is also rotatably connected to a clamping seat on the vertical side wall of the machining groove 100; the clamping seat is close to the upper inclined guide rail 211; the clamping seat includes a clamping center column 61 rotatably connected to the side wall of the machining groove 100, a clamping main seat 63 coaxially fixed to the end of the clamping center column 61, and an annular clamping drive support plate 62 coaxially fixed to the clamping center column 61; the rotation of the clamping center column 61 is driven by a motor; the outer cylindrical surface clamping mechanism includes three circumferentially distributed radial... The outer jaws 64 are movably mounted on the clamping seat, and an outer jaw drive assembly is used to drive the three outer jaws 64 to move radially in sync. The inner cylindrical clamping mechanism includes three radially movable inner jaw seats 65 evenly distributed around the circumference on the clamping seat, an inner jaw seat drive assembly for driving the three inner jaw seats 65 to move radially in sync, three telescopically mounted inner jaws 653 on the inner jaw seats 65, and an inner jaw telescopic mechanism assembly for driving the inner jaws 653 to telescopically extend and retract. The inner jaws 653 correspond one-to-one with the inner jaw seats 65.

[0067] refer to Figure 7 and Figure 8 The end face of the clamping main seat 63 away from the clamping center column 61 is formed with three circumferentially evenly distributed outer jaw moving guide grooves 630 for the outer jaw 64 to move radially, and three circumferentially evenly distributed inner jaw seat moving guide grooves 631 for the inner jaw seat 65 to move radially.

[0068] refer to Figure 7 and Figure 8 The external claw drive assembly includes three external claw drive screws 641, three external claw driven bevel gears 642, an external claw drive ring 66 coaxially rotatably connected to the clamping center column 61, an external claw drive bevel gear 661 coaxially fixed to the external claw drive ring 66, an external claw drive gear ring 662 coaxially fixed to the external claw drive ring 66, an external claw drive motor 67 fixed to the clamping drive support plate 62, and an external claw drive gear 671 coaxially fixed to the output shaft of the external claw drive motor 67. The external chuck drive motor 67 is a servo motor; the chuck drive gear 671 meshes with the external chuck drive gear ring 662; the external chuck driven bevel gear 642 corresponds one-to-one with the external chuck drive screw 641 and is coaxially fixed on the corresponding side of the external chuck drive screw 641; the external chuck drive screw 641 corresponds one-to-one with the external chuck moving guide groove 630 and is rotatably connected between a pair of side walls of the corresponding side of the external chuck moving guide groove 630; the three external chuck driven bevel gears 642 respectively mesh with the external chuck drive bevel gear 661.

[0069] refer to Figure 7 and Figure 8The inner chuck seat drive assembly includes three inner chuck seat drive screws 651, three inner chuck seat drive bevel gears 652, an inner chuck seat drive ring 68 coaxially rotatably connected to the clamping center column 61, an inner chuck seat drive bevel gear 681 coaxially fixed to the inner chuck seat drive ring 68, a cylindrical inner chuck seat connecting sleeve 682 coaxially fixed to the inner chuck seat drive ring 68, an inner chuck seat drive gear ring 683 coaxially fixed to the inner chuck seat connecting sleeve 682, an inner chuck seat drive motor 69 fixed to the clamping drive support plate 62, and a coaxially fixed... An inner chuck seat drive gear 691 is fixed on the output shaft of the inner chuck seat drive motor 69; the inner chuck seat drive motor 69 is a servo motor; the inner chuck seat drive gear 691 meshes with the inner chuck seat drive gear ring 683; the outer chuck drive ring 66 is coaxially sleeved on the inner chuck seat connecting sleeve 682; the inner chuck seat drive screw 651 corresponds one-to-one with the inner chuck seat moving guide groove 631 and is rotatably connected between a pair of side walls of the corresponding inner chuck seat moving guide groove 631; the three inner chuck seat drive bevel gears 652 respectively mesh with the inner chuck seat drive bevel gear 681.

[0070] refer to Figure 7 and Figure 8 The inner claw seat 65 has a vertical telescopic groove 650 formed on the end face away from the clamping center post 61 for the inner claw 653 to extend and retract; the inner claw telescopic mechanism assembly includes three inner claw telescopic electric cylinders 654; the inner claw telescopic electric cylinders 654 correspond one-to-one with the inner claws 653; the cylinder body of the inner claw telescopic electric cylinder 654 is inserted and fixed in the corresponding inner claw 653; the piston rod of the inner claw telescopic electric cylinder 654 is fixedly connected to the bottom surface of the vertical telescopic groove 650 on the corresponding side.

[0071] The working principle of the bearing outer ring clamping and rotating device 60 is as follows:

[0072] When machining the inner cylindrical surface of the outer ring of the bearing, the inner jaw 653 is completely retracted in the inner jaw seat 65; at this time, the outer jaw drive motor 67 drives the jaw drive gear 671 to mesh, and the outer jaw drive gear ring 662 meshing with the jaw drive gear 671 drives the outer jaw drive ring 66 and the outer jaw drive bevel gear 661 to rotate. The three outer jaw driven bevel gears 642 meshing with the outer jaw drive bevel gear 661 respectively drive the three outer jaw drive screws 641 to rotate synchronously, thereby driving the three outer jaws 64 to move radially synchronously and abut against the outer cylindrical surface of the outer ring of the bearing.

[0073] When machining the outer cylindrical surface of the bearing outer ring, the inner jaws 653 extend out and are located inside the bearing outer ring; through a similar principle, the three inner jaws 653 are driven to move radially outward and abut against the inner cylindrical surface of the bearing outer ring; then, according to the above principle, the three outer jaws 64 are driven to move radially outward, so that the turning tool 57 can be located in the gap between the outer jaws 64 and the outer cylindrical surface of the bearing outer ring, so that the turning tool 57 cooperates with the rotating bearing outer ring to machine the outer cylindrical surface of the bearing outer ring.

[0074] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A CNC machine tool for machining the outer ring of a bearing, comprising a frame (10); the frame (10) is provided with a rectangular groove-shaped machining slot (100); characterized in that: The system includes a bearing outer ring conveying device (20), a horizontal stepping conveying device (30), a bearing outer ring clamping and rotating device (60), and a turning tool device (50). The bearing outer ring clamping and rotating device (60) includes an outer cylindrical surface clamping mechanism and an inner cylindrical surface clamping mechanism. The outer cylindrical surface clamping mechanism clamps the bearing outer ring through the outer cylindrical surface of the bearing outer ring. The inner cylindrical surface clamping mechanism clamps the bearing outer ring through the inner cylindrical surface of the bearing outer ring. The bearing outer ring conveying device (20) is used for the bearing outer ring to enter and exit the CNC machine tool. The horizontal stepping conveying device (30) is used to drive the bearing outer ring to be conveyed between the bearing outer ring conveying device (20), the outer cylindrical surface clamping mechanism, and the inner cylindrical surface clamping mechanism. The turning tool device (50) is used to turn the bearing outer ring on the outer cylindrical surface clamping mechanism and the inner cylindrical surface clamping mechanism. The outer cylindrical surface clamping mechanism includes an outer cylindrical surface three-jaw chuck (40); the inner cylindrical surface clamping mechanism includes an inner cylindrical surface three-jaw chuck (70); the outer cylindrical surface three-jaw chuck (40) is rotatably connected to one vertical side wall of the machining groove (100) and the three jaws abut against the outer cylindrical surface of the bearing outer ring; the inner cylindrical surface three-jaw chuck (70) is rotatably connected to another vertical side wall of the machining groove (100) and the three jaws abut against the inner cylindrical surface of the bearing outer ring; the axes of the outer cylindrical surface three-jaw chuck (40) and the inner cylindrical surface three-jaw chuck (70) are coaxially arranged; The horizontal stepping conveyor (30) includes a horizontal support plate (32) disposed in the processing groove (100), a hollow square seat-shaped central support base (34) that is horizontally rotatably connected to the lower end face of the horizontal support plate (32) at a 90-degree equal angle, a horizontal rotation mechanism for driving the central support base (34), four gripping seats (37) horizontally telescopically disposed on the central support base (34), and a horizontal telescopic drive mechanism for driving the four gripping seats (37) to synchronously telescopically extend and retract horizontally; the four gripping seats (37) Corresponds one-to-one with the four vertical end faces of the central support base (34); the gripping base (37) includes an adsorption plate (373) located outside the central support base (34); the adsorption plate (373) has a cylindrical groove-shaped adsorption slot (3730) formed on the end face away from the central support base (34) for horizontal insertion of one end of the bearing outer ring; a plurality of circumferentially uniform negative pressure holes (3731) are formed on the inner cylindrical surface of the adsorption slot (3730); the negative pressure holes (3731) are connected to an external air extraction device; The bearing outer ring conveying device (20) includes a bearing outer ring conveying guide rail (21) fixed on the side wall of the processing groove (100) away from the opening, a limiting mechanism, and a horizontal pushing mechanism; the limiting mechanism is located in the middle of the bearing outer ring conveying guide rail (21) and is used to limit the bearing outer ring; the horizontal pushing mechanism is used to push the bearing outer ring limited by the limiting mechanism into the adsorption slot (3730) of the gripping seat (37) on the corresponding side or to bring the bearing outer ring in the adsorption slot (3730) of the gripping seat (37) on the corresponding side back to the bearing outer ring conveying guide rail (21). The horizontal pushing mechanism includes a cylindrical intermediate post (26) that is horizontally inserted on the side wall of the machining groove (100) away from the opening and matches the inner diameter of the outer ring of the bearing, an intermediate drive assembly for driving the intermediate post (26) to move horizontally, an annular outer ring (27) that is coaxially and horizontally sleeved on the intermediate post (26), and an outer drive assembly for driving the outer ring (27) to move horizontally.

2. A CNC machine tool for machining bearing outer rings according to claim 1, characterized in that: The turning tool device (50) includes a turning support base (51), a pair of turning tool mechanisms that are horizontally movable on the turning support base (51), and a turning drive mechanism for driving the pair of turning tool mechanisms to move away from or towards each other synchronously; the turning tool mechanism includes a turning support seat (54), a tool holder (56) that is horizontally movable on the upper end face of the turning support seat (54), a turning feed assembly for driving the tool holder (56) to move horizontally, and a plurality of turning tools (57) fixed on the tool holder (56); the turning tools (57) are used to turn the inner or outer diameter of the outer ring of the bearing.

3. A CNC machine tool for machining bearing outer rings according to claim 1, characterized in that: The bearing outer ring clamping and rotating device (60) further includes a clamping seat rotatably connected to the machining groove (100); the outer cylindrical surface clamping mechanism includes three radially movable outer jaws (64) evenly distributed around the circumference and an outer jaw drive assembly for driving the three outer jaws (64) to move radially synchronously; the inner cylindrical surface clamping mechanism includes three radially movable inner jaw seats (65) evenly distributed around the circumference and an inner jaw seat drive assembly for driving the three inner jaw seats (65) to move radially synchronously, three inner jaws (653) telescopically disposed on the inner jaw seats (65) and an inner jaw telescopic mechanism assembly for driving the inner jaws (653) to telescopically extend and retract; the inner jaws (653) correspond one-to-one with the inner jaw seats (65).

4. A CNC machine tool for machining bearing outer rings according to claim 3, characterized in that: The turning tool device (50) includes a turning support base (51), a turning tool mechanism horizontally movably disposed on the turning support base (51), and a turning drive mechanism for driving the turning tool mechanism to move horizontally; the turning tool mechanism includes a turning support seat (54), a tool holder (56) horizontally movably disposed on the upper end face of the turning support seat (54), a turning feed assembly for driving the tool holder (56) to move horizontally, and a plurality of turning tools (57) fixed on the tool holder (56); the turning tools (57) are used to turn the inner or outer diameter of the bearing outer ring.

5. A CNC machine tool for machining bearing outer rings according to claim 1, characterized in that: The horizontal support plate (32) is vertically raised and lowered within the processing groove (100); the top of the frame (10) is provided with a lifting drive mechanism for driving the horizontal support plate (32) to rise and fall vertically.

6. A CNC machine tool for machining bearing outer rings according to claim 1, characterized in that: The inner end of the intermediate insert (26) is equipped with several circumferentially evenly distributed spring plungers (262).

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