Manufacturing method of conical bearing retainer

Abstract

The invention discloses a conical bearing retainer manufacturing method. The conical bearing retainer manufacturing method comprises the steps that S1, a long-strip rectangular plane fabric belt is designed; s2, the first long edge of the flat fabric belt is bent in the direction perpendicular to the flat fabric belt to form a turned edge; s3, bending the flat fabric belt from the end part to form a bending area; s4, a plurality of window holes formed at intervals are formed in the circumferential direction of the bending area, and window beams are formed on the two sides of the window holes; s5, slope pressing treatment is conducted on the window beam, and a slope surface is formed; s6, according to the circumferential size of the preset conical bearing retainer, the end of the bending area is curled, and part of the bending area is curled into an annular structural body with taper; s7, the annular structural body is cut and separated from the flat fabric belt; and S8, the two ends of the annular structural body are welded, and the conical bearing retainer is obtained. According to the method, the material utilization rate can be increased, the machining cost is reduced, the technological process is simplified, the machining time is shortened, the yield is increased, and the production and machining efficiency is effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of bearing retainer manufacturing, and in particular to a method for manufacturing a tapered bearing retainer. Background Art

[0002] The bearing cage is an important component of the bearing, which partially wraps all the rolling elements to isolate the rolling elements, guide the rolling elements to roll and keep them between the inner ring and the outer ring of the bearing. There are many types and structures of bearing cages, among which the tapered bearing cage is the most common type of bearing cage, which is applied to tapered roller bearings. The tapered bearing cage includes a large diameter ring frame and a small diameter ring frame, which are connected by multiple window beams, and a window hole for installing a truncated cone-shaped rolling element is formed between two adjacent window beams.

[0003] At present, the most commonly used manufacturing process for tapered bearing cages is: a number of circular plates are punched out on a steel plate by stamping, and then the punched circular plates are formed and pressed to form a bowl-shaped structure with a conical surface and a bottom surface, and then the bottom surface of the bowl-shaped structure is cut off, the conical surface is retained, and window holes and window beams are processed on the conical surface, and then the window beams are sloped to obtain a basically formed tapered bearing cage.

[0004] The manufacturing method of the above-mentioned tapered bearing retainer has some defects: in addition to a small amount of waste scraps formed by processing the window holes, a large amount of waste scraps will be formed after the bottom surface of the bowl-shaped structure is cut off, resulting in serious material waste and low raw material utilization rate; the bottom surface is cut off by cutting, which has a complicated process, low production efficiency and high manufacturing cost; the process of processing window holes, window beams and slope pressing the window beams on the conical surface has relatively high requirements on processing equipment and slope pressing equipment, and the conical surface needs to be positioned through a relatively complicated structure before the window hole processing and window beam slope pressing can be carried out. Moreover, after processing a window hole, the conical surface needs to be rotated before the next window hole can be processed. Similarly, after slope pressing the window beams on both sides of a window hole, the conical surface needs to be rotated before the window beams on both sides of the next window hole can be sloped. Therefore, the conical surface needs to be repeatedly positioned and released, which greatly increases the difficulty of processing the tapered bearing retainer. In addition, processing window holes and window beam slopes on the conical surface can easily cause excessive deformation or even damage to the conical surface due to insufficient control accuracy of the operating force of the processing equipment, thereby rendering the semi-finished tapered bearing retainer scrapped. Summary of the invention

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

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

[0007] A method for manufacturing a tapered bearing retainer, the tapered bearing retainer comprising a large-diameter ring frame and a small-diameter ring frame, the large-diameter ring frame and the small-diameter ring frame being connected by a plurality of window beams, a window hole for mounting a rolling body being formed between two adjacent window beams, a slope being provided on a side of the window beam, the small-diameter ring frame being bent inwardly at one end facing away from the window beam to form a circular ring reinforcement portion, the circular ring reinforcement portion being arranged along a radial extension of the small-diameter ring frame; the manufacturing method comprising: S1, designing a long rectangular planar material strip, so that the two sides of the planar material strip are respectively a first long side and a second long side extending in a length direction, and a preset length of the planar material strip is greater than a circumferential dimension of the large-diameter ring frame; S2, the first long side of the planar material strip is bent in a direction perpendicular to the planar material strip to form a flange, wherein the flange corresponds to the Circular ring reinforcement portion; S3, bend the flat material strip from the end to form a bending zone, wherein the bending zone 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 a plurality of spaced window holes along the circumference of the bending zone, and form window beams on both sides of the window holes; S5, perform slope treatment on the end of the window beam close to the flange to form a slope surface; S6, according to the preset circumferential size of the tapered bearing retainer, curl from the end of the bending zone, so that part of the bending zone is curled into a tapered annular 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 the circular ring reinforcement portion, and the second long side is used to form a large-diameter ring frame; S7, cut and separate the annular structure from the flat material strip; S8, weld the two ends of the annular structure to obtain a tapered bearing retainer.

[0008] Furthermore, the manufacturing method also includes designing a first curling member and a second curling member, wherein the first curling member has a first conical surface, the second curling member 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 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: controlling the first curling member and the second curling member to rotate in opposite directions, operating 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 drive of the first conical surface and the second 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 is provided with a concave cavity with a fan-shaped cross-section, the upper mold is provided with a pressure surface adapted to the concave cavity, and the upper mold can be moved up and down by the drive of a hydraulic mechanism; the specific operation of bending one end of the planar strip to form a bending zone in S3 is: placing the planar strip on the lower mold, the upper mold moves toward the lower mold through the hydraulic mechanism, and the planar strip is squeezed and bent into the concave cavity through the pressure surface to obtain a bending zone.

[0010] Furthermore, the specific operation of designing the long rectangular flat material strip in S1 is: unwinding and leveling the rolled material strip, and then obtaining the long rectangular flat material strip by unwinding and leveling; and curling the bending area in S6 toward the curling direction of the rolled material 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 a flat material strip, the placement platform is provided with a protrusion, and both sides of the protrusion are provided with inclined surfaces, and a plurality of the protrusions are distributed along an arc to adapt to a plurality of window holes on the bending area; the specific operation of performing slope pressing on the end of the window beam close to the flange in S5 is: fixing the flat material strip on the placement platform, a plurality of protrusions and window holes correspond one to one, the inclined surfaces on both sides of the protrusion abut against the window beams located on both sides, and controlling the upper slope pressing mold to press the bending area downward, so that the inclined surfaces on both sides of the protrusion press the end of the window beam close to the flange into a sloped surface.

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

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

[0014] Furthermore, the S8 is specifically as follows: using medium frequency inverter resistance welding to weld the two ends of the annular structure, leveling the welding slag at the weld, and obtaining a tapered bearing retainer.

[0015] Furthermore, the manufacturing method further comprises the step of flattening the welding slag to obtain a tapered bearing retainer and then expanding the radial dimension of the tapered bearing retainer through an expansion die.

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

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

[0018] 1. The window holes and window beams are formed on the bending area of ​​the fan ring structure, and the forming step is before the bending area is curled. Therefore, the processing and forming steps of the window holes and window beams are implemented on the fan ring structure where the bending area is still flat. Compared with the method of processing window holes and window beams on a conical surface, processing window holes and window beams on a flat fan ring structure has relatively low requirements for processing equipment and slope pressing equipment. The flat fan ring structure is easier to position and release, and only a simple positioning structure is required. Moreover, when processing different window holes and window beams with different slopes, there is no need to rotate the bending area. A simple translation can switch the processing position. The operation is easy and the processing process is relatively simple. The operating force of the processing equipment is easier to control accurately, and it is not easy to cause unreasonable deformation of the bending area, which helps to improve the yield rate and reduce the scrap rate.

[0019] 2. This method will inevitably form a certain amount of scraps when processing the window holes, but the amount of waste scraps is very small. By directly curling the bending area to form a tapered annular structure, the annular structure becomes the basic prototype of the tapered bearing retainer. Therefore, the step of cutting off the bottom surface of the bowl-shaped structure in the existing manufacturing method is avoided, and excessive waste scraps will not be generated, which improves material utilization, thereby helping 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 and processing efficiency.

[0020] 3. This method first bends the flat material strip from the end to form a bending zone, and then processes the window hole and the window beam. In other words, the bending process is placed before the window hole processing process. Compared with placing the bending process after the window hole processing process, the bending process is avoided from being affected by the structure and strength of the flat material strip after the window hole processing and forming, especially avoiding the bending process causing irreversible and abnormal excessive deformation of the window hole and the window beam, thereby further improving the yield rate.

[0021] 4. The processed tapered bearing cage has a circular reinforcement part. While avoiding interference with the operation of the bearing, the circular reinforcement part effectively enhances the structural strength of the small-diameter ring frame, thereby effectively improving the vibration and impact resistance of the tapered bearing cage and prolonging its service life. Moreover, compared with the process of first curling the bending area into a ring structure and then forming the circular reinforcement part, the process steps are simpler and the operation is more convenient by pre-bending the flange on the flat material strip and then curling the flange to become the circular reinforcement part. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0023] Figure 1 A schematic diagram of the structure of a tapered bearing retainer provided in an embodiment of the present application;

[0024] Figure 2 Schematic diagram of the structure of the planar material strip provided in the embodiment of the present application Figure 1 ;

[0025] Figure 3 Schematic diagram of the structure of the planar material strip provided in the embodiment of the present application Figure 2 , which shows that the first long side of the planar material strip is bent in a direction perpendicular to the planar material strip to form a flange;

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

[0027] Figure 5 Schematic diagram of the structure of the planar material strip provided in the embodiment of the present application Figure 3 , which shows that the end of the flat strip is bent to form a bending area;

[0028] Figure 6 Schematic diagram of the structure of the planar material strip provided in the embodiment of the present application Figure 4 , which shows that the bending area is provided with a window hole and a window beam;

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

[0030] Figure 8 Schematic diagram of the structure of the planar material strip provided in the embodiment of the present application Figure 5 , which shows that the bending zone is curled to form a ring-shaped structure;

[0031] Fig. 9 for Figure 8 Enlarged view of middle C;

[0032] Fig.10 A schematic diagram of the structure of the annular structure provided in an embodiment of the present application;

[0033] Fig.11 A schematic diagram of the structure of a first curling member and a second curling member provided in an embodiment of the present application, wherein the arrows shown therein represent the rotation directions of the first curling member and the second curling member;

[0034] Fig.12 A schematic diagram of the structure of the upper mold and the lower mold provided in the embodiment of the present application;

[0035] Fig.13 A schematic diagram of a state in which a flat material strip provided in an embodiment of the present application is placed on a lower mold and is not bent downward by an upper mold;

[0036] Fig.14 A schematic diagram of a state in which a flat material strip provided in an embodiment of the present application is placed on a lower mold and is bent downward by an upper mold to form a bending area;

[0037] Fig.15 A schematic diagram of the structure of a slope pressing device provided in an embodiment of the present application;

[0038] Fig.16 A schematic diagram of the structure of a protrusion of a downward slope pressing mold provided in an embodiment of the present application;

[0039] Fig.17 A top view of the downward slope mold provided in an embodiment of the present application.

[0040] List of parts and reference numerals:

[0041] 11 large diameter ring frame, 12 small diameter ring frame, 121 circular ring reinforcement, 13 window beam, 131 slope, 14 window hole;

[0042] 2 plane material strip, 21 first long side, 22 second long side, 23 flange, 24 bending area, 25 annular structure;

[0043] 3 first curling member, 31 first conical surface;

[0044] 4 a second curling member, 41 a second conical surface;

[0045] 5 upper die, 51 pressing surface;

[0046] 6 lower mold, 61 cavity;

[0047] 7. Slope pressing mold;

[0048] 8 is a downward slope pressing mold, 81 is a placing platform, 82 is a convex block, and 821 is an inclined surface. DETAILED DESCRIPTION

[0049] In order to more clearly illustrate the overall concept of the present application, a detailed description is given below in an illustrative manner in conjunction with the accompanying drawings.

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

[0051] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0052] The present application provides a method for manufacturing a tapered bearing cage. For ease of description and understanding, the following contents provided in the present application are as follows: Figure 1 To Attachment Fig.17 Of course, those skilled in the art will appreciate that the above structure is only used as a specific example and schematic illustration, and cannot 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 retainer 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 a rolling body is formed between two adjacent window beams 13, a slope 131 is provided on the side of the window beam 13, and the small diameter ring frame 12 is bent inwardly at one end facing away from the window beam 13 to form a circular ring reinforcement portion 121, and the circular ring reinforcement portion 121 is arranged to extend radially along the small diameter ring frame 12;

[0054] The manufacturing method comprises:

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

[0056] S2, the first long side 21 of the planar material strip 2 is bent in a direction perpendicular to the planar material strip 2 to form a flange 23, wherein the flange 23 corresponds to the annular reinforcement portion 121 of the tapered bearing retainer; specifically, as Figure 3 and Figure 4 The figure shows the state after the first long side 21 of the flat material strip 2 is bent into the flange 23. The bending height dimension of the flange 23 is set according to the radial extension dimension of the circular ring reinforcement portion 121 of the preset tapered bearing retainer.

[0057] S3, bend the flat material strip 2 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; Figure 5 The figure shows a state where the end area of ​​the flat material strip 2 is bent to form a bending area 24. To ensure that the bending area 24 can be curled into at least one preset tapered bearing cage in 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, a plurality of window holes 14 are arranged at intervals along the circumference of the bending area 24, and window beams 13 are formed on both sides of the window holes 14; Figure 6 and Figure 7 The figure shows the state where the bending area 24 forms a plurality of window holes 14 and a window beam 13;

[0059] S5, the window beam 13 is subjected to a slope pressing process to form a slope surface 131; Figure 7 As shown, the window beams 13 on both sides of the same window hole 14 are formed with slopes 131, and the slopes 131 are used to contact with the outer cylindrical surface of the roller of the tapered roller bearing to limit the position and rotation guide the roller;

[0060] S6, according to the preset circumferential size of the tapered bearing retainer, the end of the bending area 24 is curled to make part of the bending area 24 curled into a tapered annular structure 25, so that the bottom arc of the fan ring structure is used to form a small diameter ring frame 12, the flange 23 is used to form a ring reinforcement portion 121, and the second long side 22 is used to form a large diameter ring frame 11; Figure 8 and Fig. 9 As shown, a partial area of ​​the bending area 24 is curled into a tapered annular structure 25;

[0061] S7, cutting and separating the annular structure 25 from the planar material strip 2; Fig.10 As shown, the state of the annular structure 25 being cut from the flat material strip 2, at this time, both ends of the annular structure 25 are still in a free state, and the annular structure 25 does not form a closed loop;

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

[0063] In the present method, the window hole 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 hole 14 and the window beam 13 are implemented on the fan ring structure where the bending area 24 is still a plane. Compared with the method of processing the window hole and the window beam on the conical surface, the processing of the window hole 14 and the window beam 13 on the plane fan ring structure has relatively low requirements for processing equipment and slope pressing equipment. The plane fan ring structure is easier to position and release, and only a simple positioning structure is required. Moreover, when processing different window holes 14 and window beams 13 with different slopes, there is no need to rotate the bending area 24. A simple translation can switch the processing position. The operation is easy and the processing process is relatively simple. It is not easy to cause unreasonable deformation of the bending area 24, which helps to improve the yield rate.

[0064] This method will inevitably generate a certain amount of waste scraps when processing the window hole 14, but the amount of waste scraps is very small. By directly curling the bending area 24 to form a tapered annular structure 25, the annular structure 25 becomes the basic prototype of the tapered bearing retainer. Therefore, the step of cutting off the bottom surface of the bowl-shaped structure in the existing manufacturing method is avoided, and excessive waste scraps will not be generated, thereby improving material utilization, which 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 and processing efficiency.

[0065] In the method, the flat material strip 2 is first bent from the end to form a bending area 24, and then the window hole 14 and the window beam 13 are processed. In other words, the bending process is placed before the processing process of the window hole 14. Compared with placing the bending process after the processing process of the window hole 14, the bending process is avoided from being affected by the structure and strength of the flat material strip 2 after the window hole 14 is processed and formed, and in particular, the bending process is avoided from causing irreversible and abnormal excessive deformation of the window hole 14 and the window beam 13, thereby further improving the yield rate.

[0066] The tapered bearing retainer processed by this method has a circular reinforcement portion 121. In the case of avoiding interference with the operation of the bearing, the structural strength of the small-diameter ring frame 12 is effectively enhanced by the circular reinforcement portion 121, thereby effectively improving the vibration and impact resistance of the tapered bearing retainer and improving the service life. Moreover, compared with the process of curling the bending area 24 into a ring structure and then forming the circular reinforcement portion 121, the process steps are simpler and the operation is more convenient by pre-bending the flange 23 on the flat material strip 2 and then curling the flange 23 to form the circular reinforcement portion 121.

[0067] As a preferred embodiment of the present application, the manufacturing method further includes designing a first curling member 3 and a second curling member 4, wherein: Fig.11 As shown, the first curling member 3 has a first conical surface 31, and the second curling member 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 in parallel. 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 curling gap is formed between the first conical surface 31 and the second conical surface 41. The specific operation of curling the bending area 24 into a tapered annular structure 25 in S6 is: controlling the first curling member 3 and the second curling member 4 to rotate in opposite directions to each other, Fig.11 The arrows in the diagram schematically represent the rotation direction of the first curling member 3 and the second curling member 4. The end of the bending zone 24 is operated to enter the curling gap. The bending zone 24 is curled and wound on the first conical surface 31 and the second conical surface 41 to obtain the annular structure 25. The annular structure 25 is removed from the first conical surface 31. In specific implementation, the first curling member 3 and the second curling member 4 can be supported at both ends by a supporting structure, and the supporting structure is rotatably connected to the first curling member 3 and the second curling member 4 through bearings, and the first curling member 3 and the second curling member 4 are each driven to rotate by at least one motor. The width of the curling gap formed between the first conical surface 31 and the second conical surface 41 is not greater than the thickness of the flat material strip 2. In addition, in order to ensure that the bending zone 24 is curled and wound on the first conical surface 31 and the second conical surface 41, the rotation speed of the first curling member 3 can be slightly greater than the rotation speed of the second curling member 4. Preferably, when the bending zone 24 is delivered into the curling gap, the flange 23 can be kept away from the curling gap to prevent the flange 23 from being pressed and deformed in the curling gap. The flange 23 will be curled synchronously during the curling of other areas of the bending zone 24.

[0068] As a preferred embodiment of the present application, the manufacturing method further includes designing an upper mold 5 and a lower mold 6, wherein Fig.12 As shown, the lower mold 6 is provided with a concave cavity 61 with a fan-shaped cross section, and the upper mold 5 is provided with a pressing surface 51 adapted to the concave cavity 61. The upper mold 5 can be driven by a hydraulic mechanism to move up and down; the specific operation of bending one end of the flat material strip 2 to form the bending area 24 in S3 is: the flat material strip 2 is placed on the lower mold 6, the upper mold 5 moves toward the lower mold 6 through the hydraulic mechanism, and the flat material strip 2 is squeezed and bent into the concave cavity 61 through the pressing surface 51 to obtain the bending area 24. Specifically, as Fig.13 The flat strip 2 is shown as being placed on the lower mold 6 without being bent. Fig.14The figure shows a state where the end of the planar strip 2 is squeezed by the upper die 5 and bent into the cavity 61. Those skilled in the art can understand that, since the thickness of the planar strip 2 is generally 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 planar strips 2 can be put together, and then the multiple planar strips 2 can be placed together on the lower die 6 to withstand the squeezing of the upper die 5.

[0069] As a preferred embodiment of the present application, the specific operation of designing the long rectangular flat material strip 2 in the S1 is: unwind and level the coiled material strip, and then unwind and level it to obtain the long rectangular flat material strip 2. For example, the coiled material strip can be a cold-rolled coil, and the existing unwinding and leveling machine can be used for unwinding and leveling. In addition, it can be understood by those skilled in the art that after the coiled material strip is unwinded and flattened, there is a certain tendency to recover the curling. Therefore, in the present method, the direction of curling the bending zone 24 in the S6 is toward the curling direction of the coiled material strip. In other words, the bending zone 24 is curled along the tendency of the coiled material strip to recover the curling. Therefore, the tendency of the coiled material strip to recover the curling can provide a certain boost to the curling of the bending zone 24, making the curling process smoother and reducing the risk of fracture of the bending zone 24.

[0070] As a preferred embodiment of the present application, the manufacturing method further includes designing a slope pressing device, wherein: 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 a protrusion 82, and the two sides of the protrusion 82 are provided with inclined surfaces 821, and a plurality of the protrusions 82 are distributed along an arc to adapt to the plurality of window holes 14 on the bending area 24; the specific operation of performing the slope pressing treatment on the end of the window beam 13 close to the flange 23 in S5 is: fixing the flat material strip 2 on the placement platform 81, The plurality of protrusions 82 correspond to the window holes 14 one by one, and the inclined surfaces 821 on both sides of the protrusions 82 abut against the window beams 13 on both sides. The upper slope pressing mold 7 is controlled to press the bending area 24 downward, so that the inclined surfaces 821 on both sides of the protrusions 82 press the end of the window beam 13 close to the flange 23 into a slope surface 131. Specifically, the protrusions 82 can correspond to different window holes 14 by adjusting the fixed position of the flat material strip 2 on the placement platform 81, until the upper slope pressing mold 7 presses all the window beams 13 with slope surfaces 131. It can be understood by those skilled in the art that, on the basis of the flat structure of the bending area 24 of the fan ring structure, the plurality of protrusions 82 arranged at the same height on the placement platform 81 can correspond to the plurality of window holes 14 together, so that the upper slope pressing mold 7 can press the bending area 24 downward each time, and the plurality of protrusions 82 can be used to simultaneously press the window beams 13 on both sides of the plurality of window holes 14, thereby greatly improving the slope pressing efficiency.

[0071] Regarding the formation method of the window hole 14, as a preferred embodiment of the present application, the specific operation of setting the window hole 14 in S4 is: forming the window hole 14 by punching a punching machine. In the specific operation, the flat material strip 2 is clamped by the clamp on the punching machine, and then the window hole 14 is punched on the bending area 24 by the punching die of the punching machine. As another preferred embodiment of the present application, the specific operation of setting the window hole 14 in S4 is: forming the window hole 14 by cutting a laser cutting machine. Specifically, the laser cutting machine can transport the flat material strip 2 to the laser cutting head through the clamp, and after inputting the adapted 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] As a preferred embodiment of the present application, the S8 is specifically as follows: medium frequency inverter resistance welding is used at both ends of the annular structure 25, the welding slag at the weld is leveled, the welding slag generated at the weld is reduced, and a tapered bearing retainer is obtained. Medium frequency inverter resistance welding adopts medium frequency inverter technology, the welding current is stable, the heat input is uniform, it can effectively avoid welding defects such as spatter and cracks, improve welding quality, and can also achieve fast welding and improve production efficiency. At the same time, due to its stable heat input characteristics, the welding time can be appropriately reduced, and production efficiency can be further improved. Medium frequency inverter resistance welding adopts digital control, which is easy to operate and can realize remote monitoring and control, which greatly reduces the difficulty of operation for workers and improves work efficiency. In addition, in terms of energy saving and environmental protection, medium frequency inverter resistance welding can reduce heat loss and equipment volume, and is more energy-saving and environmentally friendly.

[0073] Furthermore, after the welding slag at the weld is leveled, the tapered bearing retainer can be radially expanded through the expansion die. Specifically, in a preferred embodiment, the expansion die is provided with a conical surface corresponding to the size required by the preset tapered bearing retainer, and after the tapered bearing retainer is sleeved on the conical surface, the expansion die is used to radially expand the inner diameter of the tapered bearing retainer.

[0074] Furthermore, after the tapered bearing retainer is radially expanded, it can be further shot peened to remove burrs and sharp corners, 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 referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0076] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A method for manufacturing a tapered bearing cage, characterized in that: The tapered bearing retainer comprises a large diameter ring frame and a small diameter ring frame, wherein the large diameter ring frame and the small diameter ring frame are connected by a plurality of window beams, a window hole for installing a rolling body is formed between two adjacent window beams, a slope is provided on the side of the window beam, and an end of the small diameter ring frame facing away from the window beam is bent inward to form a circular ring reinforcement portion, and the circular ring reinforcement portion is arranged along the radial extension of the small diameter ring frame; The manufacturing method comprises: S1. Design a long rectangular planar material strip, so that two sides of the planar material strip are respectively a first long side and a second long side extending in the length direction, and a preset length of the planar material strip is greater than the circumference of the large-diameter ring frame; S2, the first long side of the planar material strip is bent in a direction perpendicular to the planar material strip to form a flange, wherein the flange corresponds to the annular reinforcement portion of the tapered bearing retainer; S3, bending the planar material strip from the end to form a bending zone, wherein the bending zone is a fan ring structure, the first long side is a bottom arc of the fan ring structure, and the second long side is a top arc of the fan ring structure; S4, a plurality of window holes are arranged at intervals along the circumference of the bending zone, and window beams are formed on both sides of the window holes; S5, performing slope pressing treatment on the window beam to form a slope surface; S6. According to the preset circumferential size of the tapered bearing retainer, the end of the bending area is curled to curl part of the bending area into a tapered annular 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 a ring reinforcement portion, and the second long side is used to form a large-diameter ring frame; S7, cutting and separating the annular structure from the flat material strip; S8. Weld the two ends of the annular structure to obtain a tapered bearing retainer.

2. The method for manufacturing a tapered bearing cage according to claim 1, characterized in that: The manufacturing method further includes designing a first curling member and a second curling member, wherein the first curling member has a first conical surface, the second curling member 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 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: controlling the first curling member and the second curling member to rotate in opposite directions, operating the end of the bending area to enter the curling gap, and the bending area is curled and wrapped around the first conical surface under the drive of the first conical surface and the second conical surface to obtain an annular structure, and removing the annular 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 is provided with a concave cavity with a fan-shaped cross section, the upper mold is provided with a pressing surface adapted to the concave cavity, and the upper mold can be driven by a hydraulic mechanism to achieve up and down movement; The specific operation of bending one end of the planar material strip to form a bending zone in S3 is: placing the planar material strip on the lower mold, moving the upper mold toward the lower mold through a hydraulic mechanism, and squeezing and bending the planar material strip into the concave cavity through the pressing surface to obtain the bending zone.

4. The method for manufacturing a tapered bearing cage according to claim 1, characterized in that: The specific operation of designing the long rectangular flat material strip in S1 is: unwinding and leveling the rolled material strip, and then unwinding and leveling it to obtain the long rectangular flat material strip; In the S6, the direction in which the bending area is curled is toward the curling direction of the rolled material 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 planar material strip, the placement platform is provided with a convex block, both sides of the convex block are provided with inclined surfaces, and a plurality of the convex blocks are distributed along an arc to adapt to a plurality of window holes on the bending area; The specific operation of performing the slope pressing treatment on the end of the window beam close to the flange in S5 is: fixing the flat material strip on the placement platform, a plurality of protrusions and window holes correspond one to one, the inclined surfaces on both sides of the protrusions abut against the window beams on both sides, and controlling the upper slope pressing mold to press the bending area downward, so that the inclined surfaces on both sides of the protrusions press the end of the window beam close to the flange into a slope surface.

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: forming the window hole by punching with a punching 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: cutting the window hole by a laser cutting machine.

8. The method for manufacturing a tapered bearing cage according to claim 1, characterized in that: The S8 is specifically as follows: using medium frequency inverter resistance welding to weld the two ends of the annular structure, leveling the welding slag at the weld, and obtaining a tapered bearing retainer.

9. The method for manufacturing a tapered bearing cage according to claim 8, characterized in that: The manufacturing method further comprises the step of flattening the welding slag to obtain a tapered bearing retainer and then expanding the radial dimension of the tapered bearing retainer through an expansion die.

10. The method for manufacturing a tapered bearing cage according to claim 9, characterized in that: The manufacturing method further comprises shot peening the tapered bearing retainer after radial dimension expansion.

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