Riveting die for cylindrical roller bearing assembly cage

Abstract

The utility model relates to a riveting mould for cylindrical roller bearing combination retainer, including positioning seat, lower mould and upper mould, its technical key point is: the upper mould and lower mould between being equipped with guide structure, the lower mould upper surface is equipped with bearing inner ring positioning ring groove, the lower mould upper surface edge is equipped with the annular riveting avoidance groove with bearing inner ring positioning ring groove concentric, the upper mould lower surface is equipped with the avoidance recess of corresponding bearing inner ring, the upper mould lower surface forms the annular riveting work surface in the avoidance recess periphery, the annular riveting work surface is located the just above of annular riveting avoidance groove, the annular riveting work surface is evenly equipped with a plurality of pre -pressing structure, the positioning seat upper part is equipped with the annular enclosure around the lower mould arrangement, the upper end surface of annular enclosure is higher than the upper surface of lower mould, the inner side wall of annular enclosure is equipped with the accommodation groove consistent with the number of cylindrical roller. The utility model has solved the problem that the flat baffle and each pillar riveting consistency is poor, and has improved riveting quality.

Description

Technical Field

[0001] This utility model relates to the field of cylindrical roller bearing assembly mold technology, specifically to a riveting mold for a cylindrical roller bearing assembly cage. Background Technology

[0002] The combined cage of a cylindrical roller bearing consists of two SPCC flat retaining rings and a set of 20# steel supports. When bearing manufacturers purchase combined cages, one flat retaining ring and each support are usually already riveted together as a single assembly by the supplier. The bearing manufacturer then assembles this assembly with the cylindrical rollers and finally rivets the other flat retaining ring to the supports. However, existing riveting fixtures cannot guarantee consistent riveting. Utility Model Content

[0003] The purpose of this invention is to provide a riveting mold for cylindrical roller bearing assembly cages that has a reasonable structure and reliable use, thereby solving the problem of poor riveting consistency between the flat retaining ring and each support column and improving the riveting quality.

[0004] The technical solution of this utility model is: A riveting die for a cylindrical roller bearing cage assembly includes a positioning seat, a lower die mounted on the positioning seat, and an upper die positioned above the lower die. The key technical features are: a guide structure is provided between the upper and lower dies; the upper surface of the lower die has a bearing inner ring positioning groove; the edge of the upper surface of the lower die has an annular riveting clearance groove concentric with the bearing inner ring positioning groove; the lower surface of the upper die has a clearance groove corresponding to the bearing inner ring; the lower surface of the upper die forms an annular riveting working surface around the clearance groove; the annular riveting working surface is located directly above the annular riveting clearance groove; multiple pre-tightening structures are evenly distributed on the annular riveting working surface; an annular barrier is provided on the upper part of the positioning seat, surrounding the lower die; the upper end face of the annular barrier is higher than the upper surface of the lower die; and the inner sidewall of the annular barrier has clearance grooves consistent with the number of cylindrical rollers.

[0005] The aforementioned riveting die for a cylindrical roller bearing assembly cage includes a pre-tightening structure comprising a longitudinal stepped hole at the edge of the upper die, a slotted flat-end set screw screwed into the upper wide diameter section of the longitudinal stepped hole, a pressure pin with the nut located in the upper wide diameter section and the screw extending through the lower narrow diameter section, and a compression spring located between the end of the slotted flat-end set screw and the nut of the pressure pin. The nut of the pressure pin is in contact with the inner shoulder of the longitudinal stepped hole under the action of the compression spring. The riveting mold for the cylindrical roller bearing assembly cage described above has five pre-clamping structures, and the phase angle between two adjacent pre-clamping structures is 72°.

[0006] The aforementioned riveting mold for a cylindrical roller bearing assembly cage has a positioning boss on the lower surface of the lower mold, a receiving groove corresponding to the lower mold on the upper surface of the positioning seat, a positioning hole that mates with the positioning boss on the bottom surface of the receiving groove, and the lower mold and the bottom surface of the receiving groove are connected and fixed by a plurality of internal hexagonal head screws.

[0007] The aforementioned riveting die for a cylindrical roller bearing cage assembly includes a guide structure comprising a guide hole at the center of the lower die and a guide post at the center of the upper die corresponding to the guide hole. The guide post has a trapezoidal cross-section, and the upper edge of the guide hole and the lower edge of the guide post are chamfered. The upper and lower dies are circumferentially positioned via the guide post and guide hole, while the trapezoidal guide post ensures that the positions of the upper and lower dies are fixed and that they will not be inserted in reverse.

[0008] The aforementioned riveting die for a cylindrical roller bearing assembly cage has a textured surface on its annular riveting working surface to reduce the contact area between the working surface and the support head, increase pressure, and make the support head more easily deformable, thus facilitating riveting.

[0009] The beneficial effects of this utility model are: 1. During use, the annular riveting clearance groove on the edge of the lower die is used to allow the riveted lower rivet joint of the support column to be properly positioned, so that the upper surface (working surface) of the lower die is in direct contact with the flat retaining ring of the cage and can withstand the pressure when the upper rivet joint of the support column is riveted.

[0010] 2. In use, the bearing inner ring is positioned using the bearing inner ring positioning groove, and each cylindrical roller of the bearing is positioned using the relief groove of the positioning seat and the bearing inner ring. The flat retaining ring to be riveted is placed on the upper end of each support of the cage. The upper riveting joint of each support passes through the flat retaining ring. During the riveting operation, the upper die moves downward, and each pre-clamping structure first clamps and positions the flat retaining ring. Then, the annular riveting working surface of the upper die presses down on the upper riveting joint of each support until it is compacted, thus completing the riveting operation.

[0011] This invention solves the problem of poor riveting consistency between the flat retaining ring and each support column through the above methods, and significantly improves the riveting quality. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the combination of the lower mold and the positioning seat of this utility model.

[0013] In the diagram: 1. Upper mold, 2. Guide post, 3. Slotted flat-end set screw, 4. Compression spring, 5. Pressure nail, 6. Socket head cap screw, 7. Annular riveting clearance groove, 8. Lower mold, 9. Positioning seat, 10. Annular riveting working surface, 11. Flat retaining ring, 12. Support column, 13. Riveted joint, 14. Bearing inner ring, 15. Positioning boss, 16. Clearance groove, 17. Bearing inner ring positioning ring groove, 18. Cylindrical roller, 19. Guide hole, 20. Clearance groove, 21. Upper riveting joint. Detailed Implementation

[0014] The present invention will be described in detail with reference to the accompanying drawings.

[0015] like Figure 1 , Figure 2 As shown, the riveting mold for a cylindrical roller bearing assembly cage includes a positioning seat 9, a lower mold 8 mounted on the positioning seat 9, and an upper mold 1 located above the lower mold 8. The lower mold 8 has a positioning boss 15 on its lower surface, and the positioning seat 9 has a corresponding receiving groove on its upper surface. The bottom surface of the receiving groove has a positioning hole that mates with the positioning boss 15. The lower mold 8 is connected and fixed to the bottom surface of the receiving groove using multiple hexagonal head screws 6.

[0016] A guide structure is provided between the upper mold 1 and the lower mold 8. In this embodiment, the guide structure includes a guide hole 19 located at the center of the lower mold 8 and a guide post 2 located at the center of the upper mold 1 and corresponding to the guide hole 19. The guide post 2 has a trapezoidal cross-section, and the upper edge of the guide hole 19 and the lower edge of the guide post 2 are respectively chamfered. The upper mold 1 and the lower mold 8 are circumferentially positioned through the guide post 2 and the guide hole 19, while the trapezoidal guide post 2 ensures that the positions of the upper and lower molds are fixed and that they will not be inserted in reverse.

[0017] The upper surface of the lower mold 8 is provided with a bearing inner ring positioning groove 17, and the edge of the upper surface of the lower mold 8 is provided with an annular riveting clearance groove 7 concentric with the bearing inner ring positioning groove 17.

[0018] The lower surface of the upper mold 1 is provided with a relief groove 16 corresponding to the inner ring 14 of the bearing. An annular riveting working surface 10 is formed around the relief groove 16 on the lower surface of the upper mold 1. The annular riveting working surface 10 is located directly above the annular riveting relief groove 7. Multiple pre-tightening structures are evenly distributed on the annular riveting working surface 10. In this embodiment, the pre-tightening structure includes a longitudinal stepped hole at the edge of the upper mold 1, a slotted flat-end set screw 3 screwed into the upper wide-diameter section of the longitudinal stepped hole, a pressure pin 5 with its nut located in the upper wide-diameter section and its screw extending through the lower narrow-diameter section, and a compression spring 4 located between the end of the slotted flat-end set screw 3 and the nut of the pressure pin 5. The nut of the pressure pin 5 is in contact with the inner shoulder of the longitudinal stepped hole under the action of the compression spring 4. The number of pre-tightening structures is 5, and the phase angle between two adjacent pre-tightening structures is 72°. See [reference needed]. Figure 2 The annular riveting working surface 10 is provided with a 0.7mm x 0.7mm mesh pattern to reduce the contact area between the working surface and the upper riveting joint 21 of the support column 12, increase the pressure, and make the upper riveting joint 21 of the support column 12 more easily deformed, thus facilitating riveting.

[0019] The positioning seat 9 is provided with an annular barrier arranged around the lower mold 8. The upper end surface of the annular barrier is higher than the upper surface of the lower mold 8. The inner side wall of the annular barrier is provided with clearance grooves 20, which are the same number as the cylindrical rollers 18.

[0020] Working principle: 1. When not in operation, the end of the pressure nail 5 extends more than 3.5mm above the working surface of the upper mold 1. Its length must be greater than the height of the upper riveting joint 21 of the support column protruding from the flat retaining ring 11. Its function is to ensure that the flat retaining ring 11 is compacted before the working surface of the upper mold 1 contacts the upper riveting joint 21 of the support column. This prevents gaps from forming between the flat retaining ring 11 of the retainer and the support column 12 during the riveting process, which would result in insufficient deformable length of the upper riveting joint 21 of the support column. This ensures that the retainer is riveted securely, meets the quality requirements of riveting, and has good consistency.

[0021] 2. Place the single-sided riveted retainer assembly above the annular riveting clearance groove 7. The riveted joint 13 at the lower part of the support column is located in the annular riveting clearance groove 7. The flat retaining ring at the lower end of the support column 12 is supported on the upper surface of the lower mold 8.

[0022] 3. Place the bearing inner ring 14 and cylindrical roller 18 assembly above the lower mold 8. The bearing inner ring 14 is positioned by the bearing inner ring positioning groove 17. Each cylindrical roller 18 is limited by the relief groove 20 of the positioning seat 9, the support column 12 of the cage and the bearing inner ring 14. Take the flat retaining ring 11 to be riveted and place it on the upper end of each support column 12 of the cage. The upper riveting joint 21 of each support column passes through the flat retaining ring 11. The ends of the pressure pins 5 of each pre-tightening structure point directly above the flat retaining ring 11.

[0023] 4. During the riveting operation, the upper die 1 is connected to the press and moves downward under the action of the press. The ends of the pressure nails 5 of each pre-tightened structure are first pressed and positioned against the flat retaining ring 11 to ensure that the pressure nails 5 are pressed at the center of the cylindrical roller 18, avoiding the upper riveting joint 21 of the retainer support. Then, the annular riveting working surface 10 of the upper die 1 is used to press down on the upper riveting joint 21 of each support until it is compacted, thus completing the riveting operation.

[0024] The embodiments of this utility model have been described in detail above, but the content described is only a preferred embodiment of this utility model and should not be considered as limiting the scope of implementation of this utility model. All equivalent changes and improvements made within the scope of this utility model should still fall within the scope of this utility model.

Claims

1. A riveting die for a cylindrical roller bearing assembly cage, comprising a positioning seat, a lower die disposed on the positioning seat, and an upper die located above the lower die, characterized in that: A guide structure is provided between the upper and lower dies. The upper surface of the lower die is provided with a bearing inner ring positioning groove. The edge of the upper surface of the lower die is provided with an annular riveting clearance groove concentric with the bearing inner ring positioning groove. The lower surface of the upper die is provided with a clearance groove corresponding to the bearing inner ring. The lower surface of the upper die forms an annular riveting working surface around the clearance groove. The annular riveting working surface is located directly above the annular riveting clearance groove. Multiple pre-pressing structures are evenly provided on the annular riveting working surface. The upper part of the positioning seat is provided with an annular barrier arranged around the lower die. The upper end face of the annular barrier is higher than the upper surface of the lower die. The inner sidewall of the annular barrier is provided with clearance grooves consistent with the number of cylindrical rollers.

2. The riveting die for a cylindrical roller bearing assembly cage according to claim 1, characterized in that: The pre-tightening structure includes a longitudinal stepped hole on the edge of the upper mold, a slotted flat-end set screw screwed into the upper wide diameter section of the longitudinal stepped hole, a pressure pin with the nut located in the upper wide diameter section and the screw rod extending through the lower narrow diameter section, and a compression spring located between the end of the slotted flat-end set screw and the nut of the pressure pin. The nut of the pressure pin is in contact with the inner shoulder of the longitudinal stepped hole under the action of the compression spring.

3. The riveting die for a cylindrical roller bearing assembly cage according to claim 2, characterized in that: The number of pre-compression structures is 5, and the phase angle between two adjacent pre-compression structures is 72°.

4. The riveting die for a cylindrical roller bearing assembly cage according to claim 1, characterized in that: The lower surface of the lower mold is provided with a positioning boss, the upper surface of the positioning seat is provided with a receiving groove corresponding to the lower mold, the bottom surface of the receiving groove is provided with a positioning hole that mates with the positioning boss, and the lower mold and the bottom surface of the receiving groove are connected and fixed by a plurality of internal hexagonal head screws.

5. The riveting die for a cylindrical roller bearing assembly cage according to claim 1, characterized in that: The guiding structure includes a guide hole located at the center of the lower mold and a guide post located at the center of the upper mold and corresponding to the guide hole. The cross-section of the guide post is trapezoidal, and the upper edge of the guide hole and the lower edge of the guide post are respectively provided with chamfers.

6. The riveting die for a cylindrical roller bearing assembly cage according to claim 1, characterized in that: The annular riveting working surface is provided with a mesh pattern.

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