A method for manufacturing a tapered bearing cage

Abstract

This application discloses a method for manufacturing a tapered bearing cage, comprising: S1, designing a long rectangular planar strip; S2, bending the first long side of the planar strip in a direction perpendicular to the planar strip to form a flange; S3, bending the planar strip from its end to form a bending area; S4, setting multiple spaced windows along the circumference of the bending area, with window beams forming on both sides of the windows; S5, slope the window beams to form a slope; S6, curling the portion of the bending area from its end according to the preset circumferential dimensions of the tapered bearing cage, so that part of the bending area is curled into a tapered annular structure; S7, cutting and separating the annular structure from the planar strip; S8, welding the two ends of the annular structure to obtain the tapered bearing cage. This method can improve material utilization, reduce processing costs, simplify the process flow, reduce processing time, increase yield, and effectively improve production efficiency.

Description

Technical Field

[0001] This application relates to the field of bearing cage manufacturing technology, and specifically to a method for manufacturing a tapered bearing cage. Background Technology

[0002] The bearing cage is an important component of a bearing, partially enclosing all the rolling elements to isolate them, guide their rotation, and hold them between the inner and outer rings of the bearing. Bearing cages come in many types and structures, with the tapered roller bearing cage being the most common, used in tapered roller bearings. The tapered roller bearing cage includes a major diameter ring and a minor diameter ring, connected by multiple window beams. Between adjacent window beams are openings for mounting the frustum-shaped rolling elements.

[0003] The most common manufacturing process for tapered bearing cages is as follows: several circular plates are stamped out of a steel plate, and then the stamped circular plates are shaped and pressed to form a bowl-shaped structure with a conical surface and a bottom surface. Then the bottom surface of the bowl-shaped structure is cut off, the conical surface is retained, and window holes and window beams are machined on the conical surface. Finally, the window beams are sloped to obtain a basically formed tapered bearing cage.

[0004] The manufacturing method of the tapered bearing cage described above has some drawbacks: in addition to a small amount of waste scrap generated from machining the window holes, a large amount of waste scrap is generated after the bottom surface of the bowl-shaped structure is removed, resulting in serious material waste and low raw material utilization; the bottom surface is removed by cutting, which is a complex process with low production efficiency and high manufacturing cost; the process of machining window holes and window beams on the tapered surface, as well as the process of sloping the window beams, places high demands on the machining equipment and sloping equipment. The tapered surface needs to be positioned using a relatively complex structure before the window holes can be machined and the window beams can be sloped. Moreover, after machining one window hole, the tapered surface needs to be rotated before machining the next window hole. Similarly, after sloping the window beams on both sides of one window hole, the tapered surface needs to be rotated before sloping the window beams on both sides of the next window hole can be sloped. Therefore, the tapered surface needs to be positioned and depositioned repeatedly, which greatly increases the machining difficulty of the tapered bearing cage. In addition, machining window holes and pressing window beams on the conical surface can easily cause excessive deformation or even damage to the conical surface due to insufficient control of the operating force of the machining equipment, which in turn makes the semi-finished tapered bearing cage scrapped. Summary of the Invention

[0005] This application provides a method for manufacturing a tapered bearing cage to solve the problems existing in the prior art.

[0006] The technical solution adopted in this application is as follows:

[0007] A method for manufacturing a tapered roller bearing cage, the tapered roller bearing cage comprising a major diameter ring frame and a minor diameter ring frame, the major diameter ring frame and the minor diameter ring frame being connected by multiple window beams, a window hole for mounting rolling elements being formed between two adjacent window beams, the window beams having a sloped side, and the minor diameter ring frame having an inwardly bent circular reinforcing portion at one end facing away from the window beam, the circular reinforcing portion extending radially along the minor diameter ring frame; the manufacturing method comprising: S1, designing a long rectangular planar material strip, such that the two sides of the planar material strip are respectively a first long side and a second long side extending along the length direction, the preset length of the planar material strip being greater than the circumference of the major diameter ring frame; S2, bending the first long side of the planar material strip in a direction perpendicular to the planar material strip to form a flange, wherein the flange corresponds to the tapered roller bearing cage... S3. Bend the flat strip from the end to form a bending area, wherein the bending area is a fan-ring structure, the first long side is the bottom arc of the fan-ring structure, and the second long side is the top arc of the fan-ring structure; S4. Set multiple spaced window holes along the circumference of the bending area, and form window beams on both sides of the window holes; S5. Slope the end of the window beam near the flange to form a slope; S6. According to the preset circumferential dimensions of the tapered bearing cage, curl the end of the bending area so that part of the bending area is curled into a tapered ring structure, so that the bottom arc of the fan-ring structure is used to form a small-diameter ring frame, the flange is used to form the ring reinforcement, and the second long side is used to form a large-diameter ring frame; S7. Cut and separate the ring structure from the flat strip; S8. Weld the two ends of the ring structure to obtain the tapered bearing cage.

[0008] Furthermore, the manufacturing method also includes designing a first curled part and a second curled part, wherein the first curled part has a first conical surface, the second curled part has a second conical surface, the central axis of the first conical surface and the central axis of the second conical surface are arranged parallel to each other, the small diameter end of the first conical surface is close to the large diameter end of the second conical surface and the large diameter end of the first conical surface is close to the small diameter end of the second conical surface, and a curling gap is formed between the first conical surface and the second conical surface; the specific operation of curling the bending area into a tapered annular structure in S6 is as follows: controlling the first curled part and the second curled part to rotate in opposite directions, operating the end of the bending area to enter the curling gap, the bending area curls under the action of the first conical surface and the second conical surface and wraps around the first conical surface to obtain an annular structure, and removing the annular structure from the first conical surface.

[0009] Furthermore, the manufacturing method also includes designing an upper mold and a lower mold, wherein the lower mold has a cavity with a fan-shaped cross-section, and the upper mold has a pressing surface adapted to the cavity. The upper mold can be moved up and down by being driven by a hydraulic mechanism. The specific operation of bending one end of the flat strip to form a bending area in S3 is as follows: the flat strip is placed on the lower mold, the upper mold moves toward the lower mold through the hydraulic mechanism, and the flat strip is squeezed and bent into the cavity by the pressing surface to obtain the bending area.

[0010] Furthermore, the specific operation of designing the long rectangular planar strip in S1 is as follows: after unwinding and leveling the rolled strip, the long rectangular planar strip is obtained; in S6, the bending direction of the bending area is oriented towards the bending direction of the rolled strip.

[0011] Furthermore, the manufacturing method also includes designing a slope pressing device, wherein the slope pressing device includes an upper slope pressing mold and a lower slope pressing mold. The lower slope pressing mold is provided with a placement platform for placing the flat strip of material. The placement platform is provided with protrusions, and the two sides of the protrusions are provided with inclined surfaces. Multiple protrusions are distributed along an arc to adapt to multiple window holes on the bending area. The specific operation of slope pressing the end of the window beam near the flange in S5 is as follows: the flat strip of material is fixed on the placement platform, multiple protrusions correspond one-to-one with the window holes, the inclined surfaces on both sides of the protrusions abut against the window beams located on both sides, and the upper slope pressing mold is controlled to press down against the bending area, so that the inclined surfaces on both sides of the protrusions press the end of the window beam near the flange into a slope.

[0012] Furthermore, the specific operation of setting the window hole in S4 is as follows: the window hole is formed by punching with a stamping machine.

[0013] Furthermore, the specific operation of setting the window hole in S4 is as follows: the window hole is formed by cutting with a laser cutting machine.

[0014] Further, S8 specifically involves: using medium-frequency inverter resistance welding to level the weld slag at both ends of the annular structure to obtain a tapered bearing cage.

[0015] Furthermore, the manufacturing method also includes radially expanding the tapered bearing cage obtained after leveling the welding slag using an expansion mold.

[0016] Furthermore, the manufacturing method also includes shot peening the tapered bearing cage after radial dimensional expansion.

[0017] Due to the adoption of the above technical solution, the technical effects achieved by this application include at least the following:

[0018] 1. Window openings and window beams are formed on the bending area of ​​the fan-ring structure, and the forming step occurs before the bending area curls. Therefore, the processing and forming steps of window openings and window beams are achieved on the fan-ring structure where the bending area is still flat. Compared with processing window openings and window beams on a conical surface, processing window openings and window beams on a flat fan-ring structure requires less stringent processing and beveling equipment. The flat fan-ring structure is easier to position and release, requiring only a simple positioning structure. Moreover, when processing different window openings and beveling different window beams, there is no need to rotate the bending area; simple translation is sufficient to switch processing locations. The operation is less difficult, the processing technology is simpler, and the operating force of the processing equipment is easier to control precisely, making it less likely to cause unreasonable deformation in the bending area. This helps to improve the yield rate and reduce the scrap rate.

[0019] 2. This method inevitably generates a certain amount of scrap material during the processing of window holes, but the amount of waste scrap material is very small. By directly rolling the bending area to form a tapered annular structure, which becomes the basic prototype of the tapered bearing cage, the step of cutting off the bottom surface of the bowl-shaped structure required in the existing manufacturing method is avoided. This reduces the amount of waste scrap material, improves material utilization, and helps to save raw materials and reduce processing costs. Moreover, it avoids the complex cutting process used for cutting off the bottom surface of the bowl-shaped structure, simplifies the process flow, helps to reduce processing time, and thus effectively improves production efficiency.

[0020] 3. This method involves first bending the flat strip from the end to form a bending zone, and then processing the window opening and window beam. In other words, the bending process is placed before the window opening processing. Compared with placing the bending process after the window opening processing, this avoids the impact of the bending process on the structure and strength of the flat strip after the window opening is formed. In particular, it avoids the window opening and window beam from undergoing irreversible and abnormal excessive deformation caused by the bending process, thus further improving the yield rate.

[0021] 4. The machined tapered bearing cage features a circular reinforcing section. This section effectively enhances the structural strength of the small-diameter ring frame without interfering with bearing operation, thereby improving the cage's resistance to vibration and impact, and extending its service life. Furthermore, compared to the process of first rolling the bending area into a ring structure and then forming the circular reinforcing section, pre-bending the flange on the flat strip and then rolling it to form the ring reinforcing section simplifies the process and makes operation more convenient. Attached Figure Description

[0022] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0023] Figure 1 This is a schematic diagram of the structure of the tapered bearing cage provided in the embodiments of this application;

[0024] Figure 2 This is a schematic diagram of the structure of the planar strip provided in the embodiments of this application. Figure 1 ;

[0025] Figure 3 This is a schematic diagram of the structure of the planar strip provided in the embodiments of this application. Figure 2 It shows that the first long side of the flat strip is bent in a direction perpendicular to the flat strip to form a flange;

[0026] Figure 4 for Figure 3 Enlarged view of section A in the middle;

[0027] Figure 5 This is a schematic diagram of the structure of the planar strip provided in the embodiments of this application. Figure 3 It shows the bending zone formed by bending the end of the flat strip;

[0028] Figure 6 This is a schematic diagram of the structure of the planar strip provided in the embodiments of this application. Figure 4 It shows that the bending area is provided with window openings and window beams;

[0029] Figure 7 for Figure 6 Enlarged view of section B;

[0030] Figure 8 This is a schematic diagram of the structure of the planar strip provided in the embodiments of this application. Figure 5 It shows that the bending area curls to form a ring structure;

[0031] Figure 9 for Figure 8 Enlarged view of section C;

[0032] Figure 10 This is a schematic diagram of the ring structure provided in the embodiments of this application;

[0033] Figure 11 The diagram shows the structure of the first and second curling components provided in the embodiments of this application, with the arrows indicating the rotation directions of the first and second curling components.

[0034] Figure 12 This is a schematic diagram of the upper and lower molds provided in the embodiments of this application;

[0035] Figure 13 This is a schematic diagram showing the flat strip of material provided in this application, placed on the lower mold and not bent downwards by the upper mold;

[0036] Figure 14 A schematic diagram showing the state in which the flat strip provided in this application is placed on the lower mold and bent downward by the upper mold to form a bending area;

[0037] Figure 15 This is a schematic diagram of the slope-stabilizing device provided in the embodiments of this application;

[0038] Figure 16 This is a schematic diagram of the structure of the protrusion of the downward pressure slope mold provided in the embodiment of this application;

[0039] Figure 17 This is a top view of the downward pressure slope mold provided in the embodiment of this application.

[0040] List of components and reference numerals:

[0041] 11 Large diameter ring frame, 12 Small diameter ring frame, 121 Circular ring reinforcement, 13 Window beam, 131 Sloping surface, 14 Window opening;

[0042] 2. Flat strip, 21. First long side, 22. Second long side, 23. Flanged edge, 24. Bending area, 25. Annular structure;

[0043] 3. First coiled component; 31. First conical surface;

[0044] 4. Second coiled part; 41. Second conical surface;

[0045] 5. Upper mold, 51. Pressing surface;

[0046] 6 lower molds, 61 cavities;

[0047] 7. Upper slope mold;

[0048] 8. Downward-pressing slope mold, 81. Placement platform, 82. Protrusion, 821. Inclined surface. Detailed Implementation

[0049] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0050] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0051] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0052] This application provides a method for manufacturing a tapered roller bearing cage. For ease of explanation and understanding, the following content provided in this application is attached. Figure 1 To be continued Figure 17 The structure shown is used as a basis for explanation. Of course, those skilled in the art will understand that the above structure is only a specific example and illustrative illustration, and does not constitute a specific limitation on the technical solution provided in this application.

[0053] The present application provides a method for manufacturing a tapered bearing cage, specifically, as follows: Figure 1 As shown, the tapered bearing cage includes a large-diameter ring frame 11 and a small-diameter ring frame 12. The large-diameter ring frame 11 and the small-diameter ring frame 12 are connected by a plurality of window beams 13. A window hole 14 for mounting rolling elements is formed between two adjacent window beams 13. The side of the window beam 13 is provided with a slope 131. The end of the small-diameter ring frame 12 facing away from the window beam 13 is bent inward to form a circular reinforcing part 121. The circular reinforcing part 121 extends radially along the small-diameter ring frame 12.

[0054] The manufacturing method includes:

[0055] S1. Design a long rectangular planar strip 2, such that the two sides of the planar strip 2 are a first long side 21 and a second long side 22 extending along the length direction, respectively. The preset length of the planar strip 2 is greater than the circumference of the large-diameter ring frame 11; specifically, the planar strip 2 is selected as follows: Figure 2 The structure shown;

[0056] S2, the first long side 21 of the flat strip 2 is bent in a direction perpendicular to the flat strip 2 to form a flange 23, wherein the flange 23 corresponds to the annular reinforcing part 121 of the tapered bearing cage; specifically, as shown in Figure 3 and Figure 4 The image shows the state after the first long side 21 of the flat strip 2 is bent into a flange 23. The bending height of the flange 23 is set according to the radial extension dimension of the annular reinforcement 121 of the tapered bearing cage.

[0057] S3. The flat strip 2 is bent from the end to form a bending area 24, wherein the bending area 24 is a fan-ring structure, the first long side 21 is the bottom arc of the fan-ring structure, and the second long side 22 is the top arc of the fan-ring structure; as shown Figure 5 The diagram shows the state in which the end area of ​​the flat strip 2 is bent to form a bending area 24. To ensure that the bending area 24 can be rolled into at least one preset tapered bearing cage through subsequent steps, the arc segment size of the second long side 22 corresponding to the bending area 24 should be at least larger than the circumferential size of the large diameter ring frame 11 of the preset tapered bearing cage.

[0058] S4. Multiple spaced window openings 14 are provided along the circumference of the bending area 24, and window beams 13 are formed on both sides of the window openings 14; such as Figure 6 and Figure 7 The diagram shows the state in which the bending zone 24 forms multiple window openings 14 and window beams 13;

[0059] S5. Slope the window beam 13 to form a slope surface 131; such as Figure 7 As shown, the window beams 13 on both sides of the same window opening 14 form a slope 131. The slope 131 is used to contact the outer cylindrical surface of the roller of the tapered roller bearing to limit the roller and guide its rotation.

[0060] S6. According to the preset circumferential dimensions of the tapered bearing cage, the portion of the bending area 24 is rolled from the end to form a tapered annular structure 25. This allows the bottom arc of the fan-shaped ring structure to form the small-diameter ring frame 12, the flange 23 to form the annular reinforcement 121, and the second long side 22 to form the large-diameter ring frame 11. Figure 8 and Figure 9 As shown, a portion of the bending zone 24 is curled into a tapered annular structure 25.

[0061] S7. Cut and separate the annular structure 25 from the planar strip 2; as shown Figure 10 As shown, the annular structure 25 is cut from the planar strip 2. At this time, the two ends of the annular structure 25 are still free, and the annular structure 25 has not formed a closed loop.

[0062] S8. Weld the two ends of the annular structure 25 to obtain the tapered bearing cage.

[0063] In this method, the window opening 14 and the window beam 13 are formed on the bending area 24 of the fan ring structure, and the forming step is located before the bending area 24 is curled. Therefore, the processing and forming steps of the window opening 14 and the window beam 13 are realized on the fan ring structure where the bending area 24 is still flat. Compared with the method of processing the window opening and the window beam on the conical surface, processing the window opening 14 and the window beam 13 on the flat fan ring structure has lower requirements for processing equipment and beveling equipment. The flat fan ring structure is easier to position and release, and only a simple positioning structure is needed. Moreover, when processing different window openings 14 and window beams 13 with different beveling, there is no need to rotate the bending area 24. Simple translation can switch the processing parts. The operation is less difficult, the processing technology is also simpler, and it is less likely to cause unreasonable deformation of the bending area 24, which helps to improve the yield rate.

[0064] This method inevitably generates a certain amount of waste scrap when processing the window hole 14, but the amount of waste scrap is very small. By directly rolling the bending area 24 to form a tapered annular structure 25, the annular structure 25 becomes the basic prototype of the tapered bearing cage. Therefore, the step of cutting off the bottom surface of the bowl-shaped structure required in the existing manufacturing method is avoided, and excessive waste scrap is not generated, which improves the material utilization rate and helps to save raw materials and reduce processing costs. Moreover, it avoids the complex cutting process used for cutting off the bottom surface of the bowl-shaped structure, simplifies the process flow, helps to reduce processing time, and thus effectively improves production efficiency.

[0065] This method involves first bending the flat strip 2 from the end to form the bending area 24, and then processing the window hole 14 and window beam 13. In other words, the bending process is performed before the window hole 14 processing process. Compared with placing the bending process after the window hole 14 processing process, this avoids the impact on the bending process caused by the changes in the structure and strength of the flat strip 2 after the window hole 14 is formed. In particular, it avoids the window hole 14 and window beam 13 from undergoing irreversible and abnormal excessive deformation caused by the bending process, thereby further improving the yield rate.

[0066] The tapered bearing cage produced by this method features a circular reinforcing section 121. While avoiding interference with bearing operation, the circular reinforcing section 121 effectively enhances the structural strength of the small-diameter ring frame 12, thereby significantly improving the tapered bearing cage's resistance to vibration and impact, and extending its service life. Furthermore, compared to the process of rolling the bending area 24 into a ring structure before forming the circular reinforcing section 121, pre-bending the flange 23 on the flat strip 2 and then rolling it to form the circular reinforcing section 121 simplifies the process and makes operation more convenient.

[0067] In a preferred embodiment of this application, the manufacturing method further includes designing a first curling component 3 and a second curling component 4, wherein, as... Figure 11 As shown, the first coiled component 3 has a first conical surface 31, and the second coiled component 4 has a second conical surface 41. The central axis of the first conical surface 31 and the central axis of the second conical surface 41 are arranged parallel to each other. The small diameter end of the first conical surface 31 is close to the large diameter end of the second conical surface 41, and the large diameter end of the first conical surface 31 is close to the small diameter end of the second conical surface 41. A coiling gap is formed between the first conical surface 31 and the second conical surface 41. The specific operation of coiling the bending area 24 into a tapered annular structure 25 in S6 is as follows: controlling the first coiled component 3 and the second coiled component 4 to rotate in opposite directions. Figure 11 The arrows in the diagram schematically represent the rotation directions of the first coiled part 3 and the second coiled part 4. The end of the bending zone 24 enters the coiling gap, and the bending zone 24, driven by the first conical surface 31 and the second conical surface 41, coils and wraps around the first conical surface 31, forming an annular structure 25. The annular structure 25 is then removed from the first conical surface 31. In specific implementation, the two ends of the first coiled part 3 and the second coiled part 4 can be supported by a support structure, and the support structure is rotatably connected to the first coiled part 3 and the second coiled part 4 via bearings. Each of the first coiled part 3 and the second coiled part 4 is driven to rotate by at least one motor. The width of the coiling gap formed between the first conical surface 31 and the second conical surface 41 is not greater than the thickness of the flat strip 2. Furthermore, to ensure that the bending zone 24 coils and wraps around the first conical surface 31 under the drive of the first conical surface 31 and the second conical surface 41, the rotational speed of the first coiled part 3 can be slightly greater than the rotational speed of the second coiled part 4. Preferably, when the bending area 24 is fed into the curling gap, the flange 23 can be avoided from the curling gap to prevent the flange 23 from being pressed and deformed in the curling gap. During the curling process of other areas of the bending area 24, the flange 23 will be curled simultaneously.

[0068] In a preferred embodiment of this application, the manufacturing method further includes designing an upper mold 5 and a lower mold 6, wherein, as... Figure 12 As shown, the lower mold 6 has a fan-shaped cavity 61, and the upper mold 5 has a pressing surface 51 adapted to the cavity 61. The upper mold 5 can move up and down by being driven by a hydraulic mechanism. The specific operation of bending one end of the flat strip 2 to form the bending area 24 in S3 is as follows: the flat strip 2 is placed on the lower mold 6, the upper mold 5 moves toward the lower mold 6 by a hydraulic mechanism, and the flat strip 2 is pressed and bent into the cavity 61 by the pressing surface 51 to obtain the bending area 24. Specifically, as shown... Figure 13 The image shows the flat strip 2 placed on the lower mold 6 without being bent, as shown. Figure 14The diagram shows the state in which the end of the flat strip 2 is pressed into the cavity 61 by the upper mold 5. Those skilled in the art will understand that, since the thickness of the flat strip 2 is generally relatively thin, in order to reduce the risk of the bending area 24 deforming in directions other than the bending direction during the bending process, multiple flat strips 2 can be put together, and then the multiple flat strips 2 can be placed together on the lower mold 6 to bear the pressure of the upper mold 5.

[0069] In a preferred embodiment of this application, the specific operation of designing the elongated rectangular planar strip 2 in S1 is as follows: after uncoiling and leveling the rolled strip, the elongated rectangular planar strip 2 is obtained. For example, the rolled strip can be a cold-rolled coil, and an existing uncoiling and leveling machine can be used for uncoiling and leveling. Furthermore, those skilled in the art will understand that after the rolled strip is uncoiled and leveled, there is a certain tendency for it to recurve. Therefore, in this method, in S6, the bending direction of the bending area 24 is oriented towards the curling direction of the rolled strip. In other words, the bending area 24 curls along the tendency of the rolled strip to recurve. Therefore, the tendency of the rolled strip to recurve can provide some assistance to the curling of the bending area 24, making the curling process smoother and reducing the risk of breakage of the bending area 24.

[0070] In a preferred embodiment of this application, the manufacturing method further includes designing a slope-stabilizing device, wherein, as... Figures 15 to 17 As shown, the slope pressing device includes an upper slope pressing mold 7 and a lower slope pressing mold 8. The lower slope pressing mold 8 is provided with a placement platform 81 for placing the flat material strip 2. The placement platform 81 is provided with protrusions 82, and the two sides of the protrusions 82 are provided with inclined surfaces 821. Multiple protrusions 82 are distributed along an arc to adapt to multiple window holes 14 on the bending area 24. The specific operation of slope pressing the end of the window beam 13 near the flange 23 in S5 is as follows: the flat material strip 2 is fixed on the placement platform 81. Multiple protrusions 82 correspond one-to-one with window openings 14. The inclined surfaces 821 on both sides of the protrusions 82 abut against the window beams 13 located on both sides. The upper pressing mold 7 is controlled to press down on the bending area 24, so that the inclined surfaces 821 on both sides of the protrusions 82 press the end of the window beam 13 near the flange 23 into a slope 131. Specifically, the fixed position of the flat strip 2 on the placement platform 81 can be adjusted so that the protrusions 82 correspond to different window openings 14, until the upper pressing mold 7 presses all window beams 13 with slopes 131. Those skilled in the art will understand that, based on the planar structure of the bending area 24 of the fan ring structure, multiple protrusions 82 arranged at the same height on the placement platform 81 can correspond to multiple window openings 14 together. Thus, each time the upper pressing mold 7 presses down on the bending area 24, multiple protrusions 82 can simultaneously press the window beams 13 on both sides of multiple window openings 14, greatly improving the pressing efficiency.

[0071] Regarding the formation of the window hole 14, in one preferred embodiment of this application, the specific operation of setting the window hole 14 in S4 is as follows: the window hole 14 is formed by stamping with a stamping machine. Specifically, the flat strip 2 is clamped by a fixture on the stamping machine, and then the window hole 14 is punched in the bending area 24 using the stamping die of the stamping machine. In another preferred embodiment of this application, the specific operation of setting the window hole 14 in S4 is as follows: the window hole 14 is formed by cutting with a laser cutting machine. Specifically, the laser cutting machine can transport the flat strip 2 to the laser cutting head through a fixture. After inputting the appropriate data into the laser cutting machine, the laser cutting head performs laser cutting on the bending area 24 according to a predetermined program to process the window hole 14.

[0072] In a preferred embodiment of this application, step S8 specifically involves: using medium-frequency inverter resistance welding to level the weld slag at both ends of the annular structure 25, reducing the amount of weld slag generated at the weld, and obtaining a tapered bearing cage. Medium-frequency inverter resistance welding utilizes medium-frequency inverter technology, providing stable welding current and uniform heat input, effectively avoiding welding defects such as spatter and cracks, improving welding quality, and enabling rapid welding, thus increasing production efficiency. Furthermore, due to its stable heat input characteristics, welding time can be appropriately reduced, further improving production efficiency. Medium-frequency inverter resistance welding employs digital control, making operation simple and enabling remote monitoring and control, which greatly reduces the operational difficulty for workers and improves work efficiency. In addition, in terms of energy conservation and environmental protection, medium-frequency inverter resistance welding can reduce heat loss and equipment size, making it more energy-efficient and environmentally friendly.

[0073] Furthermore, after leveling the weld slag at the weld seam, the tapered bearing cage can be further expanded radially using an expansion mold. Specifically, in a preferred embodiment, the expansion mold has a tapered surface corresponding to the required size of the tapered bearing cage. After the tapered bearing cage is fitted onto the tapered surface, the inner diameter of the tapered bearing cage is radially expanded using the expansion mold.

[0074] Furthermore, after the radial dimension of the tapered bearing cage is expanded, it can be shot-peened to remove burrs and sharp angles, strengthen the surface, and enhance the structural strength.

[0075] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0076] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A method for manufacturing a tapered bearing cage, characterized in that, The tapered bearing cage includes a large-diameter ring frame and a small-diameter ring frame, which are connected by multiple window beams. A window hole for mounting rolling elements is formed between two adjacent window beams. The side of the window beam is provided with a slope. The end of the small-diameter ring frame facing away from the window beam is bent inward to form a circular reinforcing part. The circular reinforcing part extends radially along the small-diameter ring frame. The manufacturing method includes: S1. Design a long rectangular planar strip, with the two sides of the planar strip being the first long side and the second long side extending along the length direction, respectively. The preset length of the planar strip is greater than the circumference of the large diameter ring frame. S2. The first long side of the flat strip is bent in a direction perpendicular to the flat strip to form a flange, wherein the flange corresponds to the annular reinforcement of the tapered bearing cage; S3. The flat strip is bent from the end to form a bending area, wherein the bending area is a fan ring structure, the first long side is the bottom arc of the fan ring structure, and the second long side is the top arc of the fan ring structure. S4. Multiple window openings are set at intervals along the circumference of the bending area, and window beams are formed on both sides of the window openings; S5. Slope the window beams to create a slope. S6. According to the preset circumferential dimensions of the tapered bearing cage, the end of the bending area is rolled up so that part of the bending area is rolled up into a tapered ring structure, and then the bottom arc of the fan ring structure is used to form a small diameter ring frame, the flange is used to form a ring reinforcement, and the second long side is used to form a large diameter ring frame. S7. Cut and separate the ring structure from the flat strip; S8. Weld the two ends of the annular structure to obtain the tapered bearing cage.

2. The method for manufacturing a tapered bearing cage according to claim 1, characterized in that, The manufacturing method further includes designing a first coiled part and a second coiled part, wherein the first coiled part has a first conical surface, the second coiled part has a second conical surface, the central axis of the first conical surface and the central axis of the second conical surface are arranged in parallel, the small diameter end of the first conical surface is close to the large diameter end of the second conical surface and the large diameter end of the first conical surface is close to the small diameter end of the second conical surface, and a coiling gap is formed between the first conical surface and the second conical surface. The specific operation of curling the bending area into a tapered ring structure in S6 is as follows: control the first curling piece and the second curling piece to rotate in opposite directions, operate the end of the bending area to enter the curling gap, the bending area is curled and wrapped around the first conical surface under the action of the first conical surface and the second conical surface to obtain a ring structure, and remove the ring structure from the first conical surface.

3. The method for manufacturing a tapered bearing cage according to claim 1, characterized in that, The manufacturing method further includes designing an upper mold and a lower mold, wherein the lower mold has a cavity with a fan-shaped cross section, the upper mold has a pressing surface adapted to the cavity, and the upper mold can move up and down by being driven by a hydraulic mechanism. The specific operation of bending one end of the flat strip to form a bending area in S3 is as follows: the flat strip is placed on the lower mold, the upper mold moves toward the lower mold through the hydraulic mechanism, and the flat strip is squeezed and bent into the cavity by the pressing surface to obtain the bending area.

4. The method for manufacturing a tapered bearing cage according to claim 1, characterized in that, The specific operation of designing the long rectangular planar strip in S1 is as follows: after unwinding and leveling the rolled strip, a long rectangular planar strip is obtained. In step S6, the direction in which the bending area is rolled is towards the rolling direction of the rolled strip.

5. The method for manufacturing a tapered bearing cage according to claim 1, characterized in that, The manufacturing method further includes designing a slope pressing device, wherein the slope pressing device includes an upper slope pressing mold and a lower slope pressing mold, the lower slope pressing mold is provided with a placement platform for placing a flat strip of material, the placement platform is provided with protrusions, the two sides of the protrusions are provided with inclined surfaces, and a plurality of the protrusions are distributed along an arc to fit a plurality of windows on the bending area. The specific operation of pressing the slope of the end of the window beam near the flange in S5 is as follows: fix the flat strip on the placement platform, with multiple protrusions and window holes corresponding one by one, and the inclined surfaces on both sides of the protrusions abutting against the window beams on both sides. Control the upper pressing mold to press down against the bending area, so that the inclined surfaces on both sides of the protrusions press the end of the window beam near the flange into a slope.

6. The method for manufacturing a tapered bearing cage according to claim 1, characterized in that, The specific operation of setting the window hole in S4 is as follows: the window hole is formed by punching with a stamping machine.

7. The method for manufacturing a tapered bearing cage according to claim 1, characterized in that, The specific operation of setting the window hole in S4 is as follows: the window hole is formed by cutting with a laser cutting machine.

8. The method for manufacturing a tapered bearing cage according to claim 1, characterized in that, Specifically, S8 involves: using medium-frequency inverter resistance welding at both ends of the annular structure, and smoothing the weld slag at the weld seam to obtain a tapered bearing cage.

9. The method for manufacturing a tapered bearing cage according to claim 8, characterized in that, The manufacturing method further includes leveling the weld slag to obtain a tapered bearing cage and then expanding its radial dimensions using an expansion mold.

10. The method for manufacturing a tapered bearing cage according to claim 9, characterized in that, The manufacturing method also includes shot peening the tapered bearing cage after radial dimensional expansion.

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