Automatic riveting device and riveting method for large deep groove ball bearing cage

Abstract

The present invention belongs to the field of mechanical processing technology, and relates to an automatic riveting device and a riveting method for a large deep groove ball bearing retainer, wherein the automatic riveting device has a riveting lower die; the riveting lower die is a step-shaped structure, and a riveting lower pressure ring is provided on the outer cylindrical surface of the riveting lower die; the riveting lower pressure ring is a ring with notches on both sides; auxiliary lifting blocks are respectively provided on both sides of the riveting lower die; the auxiliary lifting block has a protruding block protruding upward on one side close to the riveting lower die; the protrusion is movably embedded in the notches on both sides of the riveting lower pressure ring; the auxiliary lifting block makes the upper retainer and the lower retainer suspended under the action of the auxiliary lifting mechanism; the rivet has a large end at the top and a small end at the bottom, and penetrates the upper retainer and the lower retainer by gravity; the automatic riveting device is also provided with a riveting upper die. The present invention adopts a fully automatic cold riveting process to rivet deep groove ball bearings with a diameter of 300-420 mm, replacing the traditional hot riveting process, thereby improving the riveting quality and riveting efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical processing, and specifically relates to an automatic riveting device and a riveting method for a large deep groove ball bearing retainer. The invention is suitable for deep groove ball bearings with a diameter of 300-420 mm and a height of 55-80 mm. Background Art

[0002] The bearing generally includes an outer ring, an inner ring, a cage and rolling elements. The cage generally includes an upper cage and a lower cage. The operator generally divides the balls in the bearing assembly with the balls installed, and then installs the upper cage and the lower cage on the top and bottom of the bearing assembly respectively, so that the rolling elements are located in the accommodating cavity formed by the cooperation of the upper cage and the lower cage, wherein the upper cage and the lower cage are fixed together by rivets; the cage of the deep groove ball bearing generally adopts a steel plate stamping cage or a brass solid cage; the steel cage generally adopts the cold riveting process; the copper cage with a diameter less than 300mm generally adopts the cold riveting process; the copper cage with a diameter greater than 300mm generally adopts the hot riveting process, and the large end of the rivet is at the bottom and the small end is at the top during installation, and the rivet is fixed on the rivet. Apply lubricating oil (during manual hot riveting, the lubricating oil plays a viscous role to prevent the rivets from falling off during the riveting process, but when the temperature is high, the viscosity of the lubricating oil is poor), and manually control the riveting one by one. During riveting, the lower riveting head holds the large end of the rivet, and the upper riveting head holds the small end of the rivet. A large current is applied to heat the rivet to hundreds or even thousands of degrees Celsius. The upper riveting head applies pressure to rivet the small end into a pier head to fix the retaining frame; when hot riveting is performed manually, each riveting point needs to be handled separately, the operation speed is slow and the efficiency is low; the riveting quality is easily affected by human factors; the labor intensity of workers is high, especially for larger bearing components, sometimes even multiple people are required to cooperate in riveting; hot riveting requires the use of electric heating equipment for riveting, the equipment has high power, high energy consumption, and is not environmentally friendly. Summary of the invention

[0003] The purpose of the present invention is to provide an automatic riveting device and riveting method for large deep groove ball bearing cages, which can be compatible with large iron cages and copper cages, adopt a fully automatic cold riveting process for riveting, and have the characteristics of high yield and simple operation.

[0004] The present invention adopts the following technical solutions to achieve the above-mentioned purpose:

[0005] An automatic riveting device for a large deep groove ball bearing cage, wherein the bearing cage is located between the inner ring and the outer ring of the bearing and is a two-half structure consisting of an upper cage and a lower cage;

[0006] The automatic riveting device has a riveting lower die for supporting a large deep groove ball bearing assembly; the riveting lower die is a step-shaped structure, that is, the center of the riveting lower die has a boss protruding upward, and the boss is in clearance with the inner ring of the bearing; a riveting lower pressing ring is provided on the outer circumferential surface of the riveting lower die; the riveting lower pressing ring is a ring with notches on both sides; auxiliary lifting blocks are respectively provided on both sides of the riveting lower die; the auxiliary lifting blocks are two blocks corresponding to the first rivet position directly in front of the bearing retainer of the large deep groove ball bearing assembly; the auxiliary lifting blocks have a side close to the riveting lower die. There are upwardly protruding bumps; the bumps of the two auxiliary lifting blocks are movably embedded in the notches on both sides of the riveting lower pressure ring, and the bumps can move up and down relative to the riveting lower pressure ring; the height of the bumps is higher than the bottom surface of the riveting lower die, and the bumps of the two auxiliary lifting blocks together constitute a structure for supporting the upper retainer and the lower retainer, so that the upper retainer and the lower retainer are always in a fitted state to prevent gaps from appearing between the upper and lower retainers during the riveting process; the auxiliary lifting blocks and the riveting lower pressure ring together constitute a structure for supporting the bearing retainer of the large deep groove ball bearing assembly after riveting. The structure of the support; an auxiliary lifting mechanism is provided for driving the auxiliary lifting block to rise and fall, and the auxiliary lifting block rises when the automatic riveting device is working so that the upper retainer and the lower retainer are suspended, even if there is a gap between the upper retainer, the lower retainer and the rivets passing through the upper retainer and the lower retainer and the riveting lower pressing ring; the rivet has a large end at the top and a small end at the bottom, and relies on gravity to penetrate the upper retainer and the lower retainer; the automatic riveting device is also provided with a riveting upper die; the riveting upper die is a circular disc; the lower end surface of the outer circle of the riveting upper die has an annular protrusion, and the The thickness of the annular protrusion matches the thickness of the bearing retainer; a driving mechanism for driving the lifting and lowering of the corresponding riveting upper die is provided; when the large deep groove ball bearing assembly is placed on the riveting lower die in the initial state, it is in close contact with the riveting lower pressure ring. As the auxiliary lifting block rises, the lower retainer is supported, driving the large deep groove ball bearing assembly to rise as a whole, and the large deep groove ball bearing assembly is separated from the riveting lower pressure ring, resulting in a gap; as the riveting upper die descends, the large deep groove ball bearing assembly is driven to descend, the small end of the rivet first contacts the riveting lower pressure ring, and as the riveting upper die descends, the small end is riveted into a pier head.

[0007] Corresponding to the riveting lower die, a conveying mechanism for driving its horizontal movement is provided, and the conveying mechanism is used to convey the riveting lower die on which a large deep groove ball bearing assembly is placed to just below the riveting upper die; the conveying mechanism is composed of a moving slide, a linear guide rail, a moving slide plate translation cylinder, and an upper guide rail base, and the riveting lower die is fixedly connected to the moving slide; the moving slide moves between the material taking and discharging position and the riveting position along the linear guide rail under the drive of the moving slide plate translation cylinder; the upper guide rail base is supported on the lower guide rail base by a lifting linear bearing and an upper guide rail base lifting cylinder, and can drive the conveying mechanism to rise and fall relative to the lower guide rail base; the auxiliary lifting block is located on the moving slide, and can be lifted and lowered relative to the moving slide under the action of the auxiliary lifting mechanism; the auxiliary lifting mechanism is fixed on the lower guide rail base.

[0008] The riveting pressing ring is a separate structure connected to the riveting lower die by screws, or is a structure integrally formed with the riveting lower die.

[0009] The top of the protrusion of the auxiliary lifting block is coated with polyurethane.

[0010] The center of the bottom surface of the riveting upper die is provided with a limiting guide shaft, and the center of the boss of the riveting lower die is provided with a limiting guide groove cooperating with the limiting guide shaft, and a riveting adjustment pad is arranged in the limiting guide groove, and riveting adjustment pads of different heights are used to limit the riveting end position.

[0011] The angle difference between the center position of the protrusion of the auxiliary lifting block and the reference position is calculated as follows:

[0012] .

[0013] N---Number of steel balls or rivets;

[0014] The protrusion width of the auxiliary lifting block is calculated as follows:

[0015] When (w-3)>=54, W=50;

[0016] When (w-3)<54, W=[w-7].

[0017] w---Minimum spacing between adjacent rivets, unit: mm.

[0018] The specific steps of the method for riveting using the automatic riveting device for large deep groove ball bearing cage are as follows:

[0019] 1) Install multiple rivets on the upper and lower cages, with the large ends of the rivets at the top. Due to their own weight, they are not easy to fall off during movement;

[0020] 2) The robot gripper grabs the large deep groove ball bearing assembly and places the large deep groove ball bearing assembly on the riveting lower die at the material loading and unloading position. The riveting lower die moves to the riveting station under the action of the conveying mechanism, that is, the riveting lower die with the large deep groove ball bearing assembly is conveyed to the bottom of the riveting upper die; the auxiliary lifting mechanism under the riveting lower die drives the auxiliary lifting block to rise, so that the convex block on the inner side of the auxiliary lifting block presses the upper cage and the lower cage upward to prevent the upper cage and the lower cage from having a gap. The other parts of the auxiliary lifting block are located below the outer ring of the bearing to prevent the large deep groove ball bearing assembly from tilting;

[0021] 3) The driving mechanism drives the riveting upper die to descend, exerts a force on the large deep groove ball bearing assembly, and causes the large deep groove ball bearing assembly to continuously descend. During this process, the auxiliary lifting block always presses the bearing retainer to prevent a gap from appearing between the upper retainer and the lower retainer. When the small end of the rivet located below the bearing retainer contacts the riveting lower pressing ring on the riveting lower die, the small end of the rivet begins to deform, and the driving mechanism drives the riveting upper die to continue to press downward until the limit guide shaft of the riveting upper die contacts the riveting adjustment pad in the upper limit guide groove of the riveting lower die, and the small end of the rivet is riveted into a pier head, and the riveting is completed.

[0022] 4) After the riveting is completed, the conveying mechanism transports the riveted large deep groove ball bearing assembly from the riveting station to the loading and unloading position.

[0023] The invention proposes an automatic riveting device and a riveting method for a large deep groove ball bearing retainer. The rivet is inverted so that the large end is on the top and the small end is on the bottom. The rivet penetrates the upper retainer and the lower retainer under the action of gravity to prevent the rivet from falling off. When the full-automatic cold riveting process is adopted for riveting, the auxiliary lifting block supports the lower retainer upward under the action of the auxiliary lifting mechanism to ensure that the upper retainer and the lower retainer are always in contact with each other, and the rivet is prevented from being deformed in the gap between the upper retainer and the lower retainer during the riveting process, thereby improving the qualified rate of finished products. During the whole riveting process, the small end of the rivet first contacts the riveting lower pressure ring, and then as the riveting upper die descends, the small end is riveted into a pier head. The invention adopts the full-automatic cold riveting process to rivet deep groove ball bearings with a diameter of 300-420 mm, replacing the traditional hot riveting process, thereby improving the riveting quality and the riveting efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the present invention.

[0025] Figure 2 It is an assembly diagram of the riveting upper die and the riveting lower die of the present invention.

[0026] Figure 3 for Figure 2 Schematic diagram of the assembled structure.

[0027] Figure 4 It is a structural schematic diagram of the conveying mechanism of the present invention.

[0028] In the figure: 1. booster cylinder, 2. upper guide shaft, 3. riveting upper die, 4. riveting lower die, 5. auxiliary lifting block, 5-1. bump, 6. conveying mechanism, 6-1. movable slide, 6-2. linear guide, 6-3. movable slide translation cylinder, 6-4. upper guide base, 7. lower load-bearing base, 8. lifting linear bearing, 9. auxiliary lifting cylinder, 10. frame, 11. large deep groove ball bearing assembly, 11-1. bearing inner ring, 11-2. bearing retainer, 11-3. bearing outer ring, 12. riveting lower pressure ring, 13. rivet, 14. limiting guide shaft, 15. limiting guide groove, 16. riveting adjustment pad, 17. upper guide base lifting cylinder, 18. lower guide base. DETAILED DESCRIPTION

[0029] The present invention is described in detail with reference to the accompanying drawings and specific embodiments:

[0030] like Figure 1 As shown, combined with Figure 2 , Figure 3 , an automatic riveting device for a large deep groove ball bearing cage, wherein the bearing cage 11-2 is located between the bearing inner ring 11-1 and the bearing outer ring 11-3, and is a two-half structure consisting of an upper cage and a lower cage;

[0031] The automatic riveting device has a riveting lower die 4 for supporting a large deep groove ball bearing assembly 11; the riveting lower die 4 is a step-shaped structure, that is, the center of the riveting lower die 4 has a boss protruding upward, and the boss is gap-matched with the inner ring 11-1 of the bearing; a riveting lower pressing ring 12 is provided on the outer circumferential surface of the riveting lower die 4; the riveting lower pressing ring 12 is a ring with notches on both sides; auxiliary lifting blocks 5 are respectively provided on both sides of the riveting lower die 4; the auxiliary lifting blocks 5 are two blocks corresponding to the first rivet position directly in front of the bearing retainer 11-2 of the large deep groove ball bearing assembly 11; the auxiliary lifting blocks 5 are close to one of the riveting lower die 4 The side has a protruding block 5-1 protruding upward; the protruding blocks 5-1 of the two auxiliary lifting blocks 5 are movably embedded in the notches on both sides of the riveting lower pressure ring 12, and the protruding blocks 5-1 can move up and down relative to the riveting lower pressure ring 12; the height of the protruding blocks 5-1 is higher than the bottom surface of the riveting lower die 4, and the protruding blocks 5-1 of the two auxiliary lifting blocks 5 together constitute a structure for supporting the upper retainer and the lower retainer, so that the upper retainer and the lower retainer are always in a fitted state to prevent the upper and lower retainers from having gaps during the riveting process; the auxiliary lifting blocks 5 and the riveting lower pressure ring 12 together constitute a bearing for the large deep groove ball bearing assembly 11 after riveting. The structure is supported by the retainer 11-2; an auxiliary lifting mechanism is provided for driving the auxiliary lifting block 5 to rise and fall, and the auxiliary lifting mechanism rises when the automatic riveting device is working so that the upper retainer and the lower retainer are suspended, even if there is a gap between the upper retainer, the lower retainer and the rivet 13 passing through the upper retainer and the lower retainer and the riveting lower pressing ring 12; the rivet 13 has a large end at the top and a small end at the bottom, and relies on gravity to penetrate the upper retainer and the lower retainer; the automatic riveting device is also provided with a riveting upper die 3; the riveting upper die 3 is a circular disc; the lower end surface of the outer circle of the riveting upper die 3 has an annular protrusion, and the annular The thickness of the protrusion matches the thickness of the bearing retainer 11-2; a driving mechanism for driving the lifting and lowering of the corresponding riveting upper die 3 is provided; when the large deep groove ball bearing assembly 11 is initially placed on the riveting lower die 4, it is in close contact with the riveting lower pressure ring 12. As the auxiliary lifting block 5 rises, the lower retainer is supported, driving the large deep groove ball bearing assembly 11 to rise as a whole, and the large deep groove ball bearing assembly 11 is separated from the riveting lower pressure ring 12 to create a gap; as the riveting upper die 3 descends, the large deep groove ball bearing assembly 11 is driven to descend, and the small end of the rivet 13 first contacts the riveting lower pressure ring 12, and as the riveting upper die 3 descends, the small end is riveted into a pier head.

[0032] Corresponding to the riveting lower die 4 , a conveying mechanism 6 is provided for driving the horizontal movement thereof. The conveying mechanism 6 is used for conveying the riveting lower die 4 with the large deep groove ball bearing assembly 11 placed thereon to the bottom of the riveting upper die 3 .

[0033] Combination Figure 4 The conveying mechanism 6 is composed of a moving slide 6-1, a linear guide 6-2, a moving slide translation cylinder 6-3, and an upper guide base 6-4. The riveting lower die 4 is fixedly connected to the moving slide 6-1; the moving slide 6-1 moves between the material taking and unloading position and the riveting position along the linear guide 6-2 under the drive of the moving slide translation cylinder 6-3; the auxiliary lifting block 5 is located on the moving slide 6-1, and can be lifted and lowered relative to the moving slide 6-1 under the action of the auxiliary lifting mechanism; the auxiliary lifting mechanism is fixed on the lower guide base 18; the upper guide base 6-4 is supported on the lower guide base 18 by a lifting linear bearing 8 and an upper guide base lifting cylinder 17, and can drive the conveying mechanism 6 to lift and lower relative to the lower guide base 18; the moving slide After the plate 6-1 drives the riveting lower die 4 to reach the riveting station, the upper guide rail base 6-4 drives the moving slide 6-1 and the riveting lower die 4, the riveting lower pressing ring 12, the riveting adjustment pad 16, and the auxiliary lifting block 5 to descend relative to the lower guide rail base 18 under the action of the lifting linear bearing 8, so that the bottom of the riveting lower die 4 is in close contact with the force-bearing pad on the lower load-bearing base 7 to bear the pressure during riveting; the lifting linear bearing 8 fixed on the lower guide rail base 18 and the upper guide rail base lifting cylinder 17 control the upper guide rail base 6-4 to drive the moving slide 6-1 to rise as a whole; after the riveting is completed, the upper guide rail base 6-4 drives the moving slide 6-1 to rise as a whole, and after separating from the force-bearing pad, the large deep groove ball bearing assembly 11 placed on the riveting lower die 4 is moved to the material picking and unloading position under the control of the conveying mechanism 6.

[0034] The auxiliary lifting mechanism is driven by an auxiliary lifting cylinder 9.

[0035] The riveting pressing ring 12 is a separate structure connected to the riveting lower die 4 by screws, or is a structure integrally formed with the riveting lower die 4.

[0036] The top of the protrusion 5 - 1 of the auxiliary lifting block 5 is coated with polyurethane.

[0037] The center of the bottom surface of the riveting upper die 3 has a limiting guide shaft 14, and the center of the boss of the riveting lower die 4 has a limiting guide groove 15 that cooperates with the limiting guide shaft 14. A riveting adjustment pad 16 is arranged in the limiting guide groove 15, and riveting adjustment pads of different heights are used to limit the riveting end position.

[0038] The driving mechanism comprises a booster cylinder 1 and an upper guide shaft 2; the output end of the booster cylinder 1 is connected to a riveting upper die 3.

[0039] The angle difference between the center position of the protrusion 5-1 of the auxiliary lifting block 5 and the reference position needs to be precisely calculated and matched with the model of the bearing retainer 11-2; the angle difference between the center position of the protrusion of the auxiliary lifting block 5 and the reference position is calculated as follows:

[0040]

[0041] N---Number of steel balls or rivets;

[0042] The protrusion width of the protrusion 5-1 of the auxiliary lifting block 5 is calculated as follows:

[0043] When (w-3)>=54, W=50;

[0044] When (w-3)<54, W=[w-7].

[0045] w---Minimum spacing between adjacent rivets, unit: mm.

[0046] The reference position is the first rivet position directly in front of the bearing cage.

[0047] The specific steps of the method for riveting using the automatic riveting device for large deep groove ball bearing cage are as follows:

[0048] 1) Install multiple rivets 13 on the upper and lower retainers, with the large ends of the rivets 13 at the top, so that they are not easy to fall off during the movement due to their own weight;

[0049] 2) The robot gripper grabs the large deep groove ball bearing assembly 11, and places the large deep groove ball bearing assembly 11 on the riveting lower die 4 at the material loading and unloading position. The riveting lower die 4 moves to the riveting station under the action of the conveying mechanism 6, that is, the riveting lower die 4 with the large deep groove ball bearing assembly 11 is conveyed to the bottom of the riveting upper die 3; the auxiliary lifting mechanism under the riveting lower die 4 drives the auxiliary lifting block 5 to rise, so that the convex block 5-1 on the inner side of the auxiliary lifting block 5 presses the upper retainer and the lower retainer upward to prevent a gap from appearing between the upper retainer and the lower retainer. The other parts of the auxiliary lifting block 5 are located below the bearing outer ring 11-3 to prevent the large deep groove ball bearing assembly 11 from tilting;

[0050] 3) The driving mechanism drives the riveting upper die 3 to descend, exerts a force on the large deep groove ball bearing assembly 11, and causes the large deep groove ball bearing assembly 11 to continuously descend. During this process, the auxiliary lifting block 5 always presses the bearing retainer 11-2 to prevent a gap from appearing between the upper retainer and the lower retainer. When the small end of the rivet 13 located below the bearing retainer 11-2 contacts the riveting lower pressing ring 12 on the riveting lower die 4, the small end of the rivet 13 begins to deform, and the driving mechanism drives the riveting upper die 3 to continue to press down until the limiting guide shaft 14 of the riveting upper die 3 contacts the riveting adjustment pad 16 in the upper limiting guide groove 15 of the riveting lower die, and the small end of the rivet 13 is riveted into a pier head, and the riveting is completed.

[0051] 4) After the riveting is completed, the conveying mechanism 6 transports the large deep groove ball bearing assembly that has been riveted from the riveting station to the loading and unloading position.

Claims

1. An automatic riveting device for a large deep groove ball bearing cage, wherein the bearing cage is located between the inner ring and the outer ring of the bearing and is a two-half structure consisting of an upper cage and a lower cage; the characteristics are: The automatic riveting device has a riveting lower die for supporting a large deep groove ball bearing assembly; the riveting lower die is a step-shaped structure, that is, the center of the riveting lower die has a boss protruding upward, and the boss is in clearance with the inner ring of the bearing; the outer circumferential surface of the riveting lower die is provided with a riveting lower pressure ring; the riveting lower pressure ring is a ring with notches on both sides; auxiliary lifting blocks are respectively arranged on both sides of the riveting lower die; the auxiliary lifting blocks are two corresponding to the first rivet position directly in front of the bearing retainer of the large deep groove ball bearing assembly The auxiliary lifting block has a protruding block protruding upward on one side close to the riveting lower die; the protruding blocks of the two auxiliary lifting blocks are movably embedded in the notches on both sides of the riveting lower pressing ring, and the protruding blocks can move up and down relative to the riveting lower pressing ring; the height of the protruding blocks is higher than the bottom surface of the riveting lower die, and the protruding blocks of the two auxiliary lifting blocks together constitute a structure for supporting the upper retainer and the lower retainer, so that the upper retainer and the lower retainer are always in a fitted state, preventing a gap from appearing between the upper and lower retainers during the riveting process; The auxiliary lifting block and the riveting pressing ring together constitute a structure for supporting the bearing cage of the large deep groove ball bearing assembly after riveting; an auxiliary lifting mechanism is provided for driving the auxiliary lifting block to rise and fall, and the auxiliary lifting block rises when the automatic riveting device is working so that the upper cage and the lower cage are suspended, even if there is a gap between the upper cage, the lower cage and the rivets passing through the upper cage and the lower cage and the riveting pressing ring; the rivet has a large end at the top and a small end at the bottom, and passes through the upper cage and the lower cage by gravity; the automatic riveting device is also provided with a riveting upper die; the riveting upper die is a circular disc; The lower end surface of the outer circle of the riveting upper die has an annular protrusion, and the thickness of the annular protrusion matches the thickness of the bearing retainer; a driving mechanism for driving the lifting and lowering of the riveting upper die is provided corresponding to the riveting upper die; when the large deep groove ball bearing assembly is placed on the riveting lower die in the initial state, it is in close contact with the riveting lower pressure ring. As the auxiliary lifting block rises, the lower retainer is supported, driving the large deep groove ball bearing assembly to rise as a whole, and the large deep groove ball bearing assembly is separated from the riveting lower pressure ring to produce a gap; as the riveting upper die descends, the large deep groove ball bearing assembly is driven to descend, the small end of the rivet first contacts the riveting lower pressure ring, and as the riveting upper die descends, the small end is riveted into a pier head.

2. The automatic riveting device for a large deep groove ball bearing cage according to claim 1, characterized in that: Corresponding to the riveting lower die, a conveying mechanism for driving its horizontal movement is provided, and the conveying mechanism is used to convey the riveting lower die on which a large deep groove ball bearing assembly is placed to just below the riveting upper die; the conveying mechanism is composed of a moving slide, a linear guide rail, a moving slide plate translation cylinder, and an upper guide rail base, and the riveting lower die is fixedly connected to the moving slide; the moving slide moves between the material taking and discharging position and the riveting position along the linear guide rail under the drive of the moving slide plate translation cylinder; the upper guide rail base is supported on the lower guide rail base by a lifting linear bearing and an upper guide rail base lifting cylinder, and can drive the conveying mechanism to rise and fall relative to the lower guide rail base; the auxiliary lifting block is located on the moving slide, and can be lifted and lowered relative to the moving slide under the action of the auxiliary lifting mechanism; the auxiliary lifting mechanism is fixed on the lower guide rail base.

3. The automatic riveting device for large deep groove ball bearing cage according to claim 1, characterized in that: The riveting pressing ring is a separate structure connected to the riveting lower die by screws, or is a structure integrally formed with the riveting lower die.

4. The automatic riveting device for a large deep groove ball bearing cage according to claim 1, characterized in that: The center of the bottom surface of the riveting upper die is provided with a limiting guide shaft, and the center of the boss of the riveting lower die is provided with a limiting guide groove cooperating with the limiting guide shaft, and a riveting adjustment pad is arranged in the limiting guide groove, and riveting adjustment pads of different heights are used to limit the riveting end position.

5. The automatic riveting device for large deep groove ball bearing cage according to claim 1, characterized in that: The angle difference between the center position of the protrusion of the auxiliary lifting block and the reference position is calculated as follows: ； N---Number of steel balls or rivets; The protrusion width of the auxiliary lifting block is calculated as follows: When (w-3)>=54, W=50; When (w-3)<54, W=[w-7]; w---Minimum spacing between adjacent rivets, unit: mm.

6. A method for riveting using the automatic riveting device for large deep groove ball bearing cages according to any one of claims 1 to 5, characterized in that: The specific steps are as follows: 1) Install multiple rivets on the upper and lower cages, with the large ends of the rivets at the top. Due to their own weight, they are not easy to fall off during movement; 2) The robot gripper grabs the large deep groove ball bearing assembly and places the large deep groove ball bearing assembly on the riveting lower die at the material loading and unloading position. The riveting lower die moves to the riveting station under the action of the conveying mechanism, that is, the riveting lower die with the large deep groove ball bearing assembly is conveyed to the bottom of the riveting upper die; the auxiliary lifting mechanism under the riveting lower die drives the auxiliary lifting block to rise, so that the convex block on the inner side of the auxiliary lifting block presses the upper cage and the lower cage upward to prevent the upper cage and the lower cage from having a gap. The other parts of the auxiliary lifting block are located below the outer ring of the bearing to prevent the large deep groove ball bearing assembly from tilting; 3) The driving mechanism drives the riveting upper die to descend, exerts force on the large deep groove ball bearing assembly, and causes the large deep groove ball bearing assembly to continuously descend. During this process, the auxiliary lifting block always presses the bearing cage to prevent a gap from appearing between the upper cage and the lower cage; When the small end of the rivet located below the bearing retainer contacts the riveting pressing ring on the riveting lower die, the small end of the rivet begins to deform, and the driving mechanism drives the riveting upper die to continue pressing down until the limit guide shaft of the riveting upper die contacts the riveting adjustment pad in the upper limit guide groove of the riveting lower die, and the small end of the rivet is riveted into a pier head, and the riveting is completed; 4) After the riveting is completed, the conveying mechanism transports the riveted large deep groove ball bearing assembly from the riveting station to the loading and unloading position.

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