Solid cage for cylindrical roller bearing, machining method and milling cutter for machining

Abstract

The present application relates to a solid retainer for cylindrical roller bearing, a machining method and a milling cutter for machining, the solid retainer for cylindrical roller bearing comprises an annular body provided integrally, a plurality of square pockets are formed on the annular body, each square pocket comprises two radially opposite sides and two axially opposite sides, each axially opposite side is sequentially provided with a rolling surface, a lock roller surface and a guide surface from outside to inside, which is simple in structure, safe and reliable, and can improve the service life of the bearing. The machining method of the solid retainer for cylindrical roller bearing provided by the present application is high in machining precision, convenient to operate and high in machining efficiency. The milling cutter for machining the solid retainer for cylindrical roller bearing provided by the present application can process the structure of each surface in the pocket of the solid retainer for cylindrical roller bearing by one milling cutter, which simplifies the machining process, can ensure the smooth machining of the pocket of the solid retainer for cylindrical roller bearing, and is high in machining efficiency and machining precision.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bearing cage processing, in particular to a solid cage for cylindrical roller bearing, a processing method and a milling cutter for processing. BACKGROUND

[0002] At present, the cylindrical bearing (42724QT) used in railway passenger cars is a square hole structure, and the rollers are loaded from the outer diameter of the cage. The square hole structure has four locking roller points formed at the inner diameter of the square hole during the broaching process to prevent the rollers from falling out from the inside. This square hole structure needs to be bored with three rows of pockets before processing the square hole, and the square hole is positioned by the middle hole. After the hole is broached, it needs to be finished again, which is particularly cumbersome. Moreover, four locking points are formed during broaching, and the size and position consistency is very poor, often causing unevenness, which causes the rollers to be tilted after being loaded. The broaching process also easily causes the cage to deform, and when the broach is blunt, the size of the inner diameter is smaller than that of the outer diameter. These problems will cause the bearing to clamp the roller, the roller to be stuck, and other problems during use, causing major quality accidents. In order to ensure the safety performance of the bearing during use, a new cylindrical roller bearing cage is urgently needed. SUMMARY

[0003] In view of the defects of the prior art, the purpose of the present application is to provide a solid cage for cylindrical roller bearing, which is simple in structure, safe and reliable, and can improve the service life of the bearing.

[0004] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0005] The solid cage for cylindrical roller bearing comprises an annular body provided integrally, a plurality of square pockets are formed in the annular body, each square pocket comprises two radially opposite side surfaces and two axially opposite side surfaces, wherein the two axially opposite side surfaces are matched with the outer circumferential surface of the cylindrical roller, and the two radially opposite side surfaces are matched with the end surface of the cylindrical roller. Each of the axially opposite side surfaces is sequentially provided with a rolling surface, a roller locking surface and a guide surface from outside to inside.

[0006] Further, the roller locking surface and the guide surface extend inwardly beyond the inner wall of the annular body.

[0007] Further, the rolling surface is a straight surface, and the straight surface is in line contact with the cylindrical roller.

[0008] Further, the roller locking surface is an inner concave curved surface.

[0009] Further, the inner concave curved surface is in line contact with the cylindrical roller.

[0010] Further, the radius corresponding to the inner concave curved surface is half of the distance between the two rolling surfaces in the pocket.

[0011] Further, the guide surface is an inclined surface inclined to a side away from the lock roller surface.

[0012] Further, the rolling surface, the lock roller surface and the guide surface are smoothly connected.

[0013] Further, the four corners of the square pocket hole are provided with grooves in the radial direction.

[0014] Further, a cross beam is arranged between adjacent square pocket holes, the axial side is formed on the cross beam, and the lock roller surface and the guide surface are formed on the boss on the inner diameter side of the cross beam.

[0015] Compared with the prior art, the beneficial effects of the present application are:

[0016] The cylindrical roller bearing solid retainer provided by the present application comprises an annular body, a plurality of square pocket holes are formed in the annular body, each square pocket hole comprises two radially opposite radial sides and two axially opposite axial sides, the two axial sides are matched with the outer circumferential surface of the cylindrical roller, the two radial sides are matched with the end surface of the cylindrical roller, and the axial side is sequentially provided with a rolling surface, a lock roller surface and a guide surface from the outside to the inside. It has the advantages of simple structure, safety and reliability, and can improve the service life of the bearing.

[0017] Another object of the present application is to provide a cylindrical roller bearing solid retainer machining method, which can machine the rolling surface, the lock roller surface and the guide surface on the axial side of the square pocket hole by a forming milling cutter.

[0018] Compared with the prior art, the cylindrical roller bearing solid retainer machining method has the following beneficial effects:

[0019] The thrust cylindrical roller bearing solid retainer machining method provided by the present application has high machining precision, is convenient to operate, and has high machining efficiency.

[0020] Another object of the present application is to provide a cylindrical roller bearing solid retainer machining milling cutter, which can ensure smooth machining of the cylindrical roller bearing solid retainer, has high machining efficiency and high machining precision.

[0021] In order to achieve the above object, the present application adopts the following technical solutions:

[0022] The application discloses a milling cutter for machining solid retainer of cylindrical roller bearing, which comprises a cutter bar, at least one cutting edge and a chip removal groove are arranged on the outer circumferential surface of the lower end of the cutter bar, the cutting edge comprises a rake face, a relief face and a combined cutting edge formed by the intersection of the rake face and the relief face, the blade shape curve of the combined cutting edge comprises an outer convex arc segment in the middle, a slanted segment is connected to one side of the outer convex arc segment close to the lower end surface of the cutter bar, and a straight segment is connected to the other side of the outer convex arc segment away from the lower end surface of the cutter bar.

[0023] Further, one end of the slanted segment away from the outer convex arc segment is inclined to the side away from the central axis of the cutter bar.

[0024] Further, the connection between the outer convex arc segment and the straight segment and the connection between the outer convex arc segment and the slanted segment are both smoothly transitioned.

[0025] Further, a first concave arc blade is arranged at one end of the straight segment away from the outer convex arc segment, a second concave arc blade is arranged at one end of the slanted segment away from the outer convex arc segment, and the connection between the first concave arc blade and the straight segment and the connection between the second concave arc blade and the slanted segment are both smoothly transitioned.

[0026] Further, the cutting edge is three circumferentially distributed cutting edges, and the chip removal groove is arranged between the two adjacent cutting edges.

[0027] Further, the chip removal groove is a V-shaped groove.

[0028] Further, the rake face is a side wall surface of the chip removal groove.

[0029] Further, the cutting edge is concave in the outer circumferential surface of the cutter bar.

[0030] Further, the combined cutting edge is arranged in the axial direction of the cutter bar.

[0031] Further, the outer convex arc segment is formed on a drum-shaped segment in the middle of the relief face, the straight segment is formed on a cylindrical segment on the relief face, and the slanted segment is formed on a conical segment on the relief face.

[0032] The application has the following beneficial effects compared with the prior art:

[0033] The milling cutter for machining the solid retainer for cylindrical roller bearings comprises a cutter bar, at least one cutting edge portion and a chip groove matched with the cutting edge portion are arranged on the outer circumferential surface of the lower end portion of the cutter bar, the cutting edge portion comprises a rake face, a relief face and a combined cutting edge formed by the intersection of the rake face and the relief face, the blade shape curve of the combined cutting edge comprises an outer convex arc segment in the middle, a slanted line segment is connected to one side of the outer convex arc segment close to the lower end surface of the cutter bar, and a straight line segment is connected to the other side of the outer convex arc segment away from the lower end surface of the cutter bar. The milling cutter can process the structures of various surfaces in the pocket hole of the solid retainer for cylindrical roller bearings, simplifies the processing technology, ensures the smooth processing of the pocket hole of the solid retainer for cylindrical roller bearings, and is high in processing efficiency and precision. BRIEF DESCRIPTION OF DRAWINGS

[0034] Fig. 1 It is a front view structural schematic diagram of the pocket hole of the solid retainer for cylindrical roller bearings of the embodiment of the present application.

[0035] Fig. 2 It is a left view structural schematic diagram of the pocket hole of the solid retainer for cylindrical roller bearings of the embodiment of the present application.

[0036] Fig. 3 It is a three-dimensional structural schematic diagram of the pocket hole of the solid retainer for cylindrical roller bearings of the embodiment of the present application.

[0037] Fig. 4 It is a front view structural schematic diagram of the milling cutter of the embodiment of the present application.

[0038] Fig. 5 It is a left view structural schematic diagram of the milling cutter of the embodiment of the present application.

[0039] Fig. 6 It is a three-dimensional structural schematic diagram of the milling cutter of the embodiment of the present application.

[0040] In the figure: 1, annular body, 2, square pocket hole, 3, rolling surface, 4, roller locking surface, 5, guide surface, 6, cross beam, 8, groove, 9, boss, 10, cutter bar, 11, chip groove, 12, rake face, 13, relief face, 14, outer convex arc segment, 15, straight line segment, 16, slanted line segment, 17, first inner concave arc blade, 18, second inner concave arc blade. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application.

[0042] Embodiment 1

[0043] As Figs. 1-3As shown, the cylindrical roller bearing solid retainer comprises an annular body 1 which is integrally arranged, and a plurality of square pockets 2 are arranged on the annular body 1 and are evenly distributed along the central axis of the annular body 1, each square pocket 2 comprises two oppositely arranged radial sides and two oppositely arranged axial sides, wherein the two axial sides are matched with the outer circumferential surface of the cylindrical roller, and the two radial sides are matched with the end surface of the cylindrical roller, and each axial side is sequentially provided with a rolling surface 3, a roller locking surface 4 and a guide surface 5 from outside to inside.

[0044] It should be noted that the cylindrical roller bearing solid retainer of the embodiment has simple structure and is safe and reliable, the square pocket 2 is provided with the roller locking surface 4, which can lock the roller in the rolling surface 3 to prevent the rolling body from falling from the inside, and the square pocket 2 is provided with the guide surface 5, which facilitates the installation of the cylindrical roller from the inside of the retainer, and finally improves the service life of the bearing.

[0045] Specifically, the roller locking surface 4 and the guide surface 5 of the embodiment extend inwardly to the inner wall of the annular body. The rolling surface 3 is a straight surface which is in line contact with the cylindrical roller.

[0046] The roller locking surface 4 is an inner concave arc surface which is in line contact with the cylindrical roller. It should be noted that the above structure of the rolling surface 3 and the roller locking surface 4 of the embodiment is reasonable, which is beneficial to the rolling of the cylindrical roller in the pocket and improves the stability of its operation.

[0047] Preferably, in order to ensure that the rolling body has sufficient freedom and is not stuck, the radius corresponding to the inner concave arc surface is half of the distance between the two rolling surfaces 3 in the pocket.

[0048] In order to facilitate the installation of the cylindrical roller from the inside of the retainer into the pocket, the guide surface 5 of the embodiment is an inclined surface which is inclined away from the roller locking surface 4.

[0049] In order to ensure the quick installation of the cylindrical roller and avoid scratching during the installation process, the junction between the rolling surface and the outer circumferential surface of the annular body, the junction between the rolling surface 3 and the roller locking surface 4, and the junction between the roller locking surface 4 and the guide surface 5 are all smoothly transitioned, and a circular arc transition surface (i.e. a chamfered corner) is arranged at the inner edge of the guide surface 5.

[0050] In order to ensure the free rolling of the cylindrical roller and the stable operation of the bearing, the square pocket 2 of the embodiment is provided with a groove 8 in the radial direction at the four corners, and preferably the cross section of the groove 8 is in the form of a circular arc. When in use, the groove 8 can also store lubricating oil, which facilitates the lubrication of the roller.

[0051] It should be noted that in this embodiment, a crossbeam 6 is provided between adjacent square pockets 2, with the axial side formed on the crossbeam 6, and the locking roller surface 4 and the guide surface 5 formed on the boss 9 on the inner diameter side of the crossbeam 6. Preferably, the width between the locking roller surfaces 4 on the two bosses 9 inside the pocket is 0.1 to 0.15 times smaller than the diameter of the cylindrical roller, thereby ensuring that the cage does not shed slag and the roller is not scratched during bearing assembly. It should be noted that in this embodiment, the cylindrical roller can be installed into the square pocket through the outer diameter side of the cage or through the inner diameter side of the cage. When the inner diameter is selected for cylindrical roller installation, after the cylindrical roller enters the guide roller opening formed by the guide surfaces 5 on both sides of the cage pocket, it is gently tapped and pressed with a rubber hammer, and enters the square pocket through the elastic deformation of the cage. The presence of the locking roller surface 4 ensures that the cylindrical roller will not fall out of the square pocket. Furthermore, in this embodiment, the locked roller surface 4 is in contact with the cylindrical roller line, which has high strength, is not easy to wear, and is also easy to process.

[0052] Example 2

[0053] like Figs. 4-6 As shown, a milling cutter for machining solid cages of cylindrical roller bearings, used for machining the solid cages of cylindrical roller bearings in Embodiment 1, includes: a cutter shank 10, the lower end of which has at least one cutting edge and a chip removal groove 11 adapted to the cutting edge on its outer circumferential surface. Specifically, in this embodiment, there are three circumferentially distributed cutting edges, and a chip removal groove 11 is provided between two adjacent cutting edges. Its structure is more reasonable, has greater strength, facilitates chip removal, and achieves higher machining accuracy.

[0054] The cutting edge is entirely concave on the outer circumferential surface of the tool holder 10. Specifically, the cutting edge includes a rake face 12, a flank face 13, and a combined cutting edge formed by the intersection of the rake face 12 and the flank face 13. The combined cutting edge is arranged along the axial direction of the tool holder 10. The cutting edge profile of the combined cutting edge includes a convex arc segment 14 located in the middle, a sloping line segment 16 connected to the side of the convex arc segment 14 near the lower end face of the tool holder 10, and a straight line segment 15 connected to the side of the convex arc segment 14 away from the lower end face of the tool holder 10. The end of the sloping line segment 16 away from the convex arc segment 14 is inclined away from the central axis of the tool holder 10.

[0055] To ensure the accuracy of the axial side of the hole after machining, the connection between the convex arc segment 14 and the straight segment 15, as well as the connection between the convex arc segment 14 and the oblique segment 16, are all smoothly transitioned.

[0056] To facilitate the installation of the cylindrical rolling element, a first concave arc blade 17 is provided at the end of the straight segment 15 away from the convex arc segment 14, and a second concave arc blade 18 is provided at the end of the oblique segment 16 away from the convex arc segment 14. To ensure the accuracy of the axial side of the hole after machining, the connection between the first concave arc blade 17 and the straight segment 15, and the connection between the second concave arc blade 18 and the oblique segment 16, are all smoothly transitioned.

[0057] In order to facilitate chip removal, the chip flute 11 is a V-shaped groove. The rake face 12 is a side wall surface of the chip flute 11.

[0058] In a specific embodiment, the outer convex arc segment 14 is formed on a drum-shaped segment in the middle of the relief face 13, the straight line segment 15 is formed on a cylindrical segment on the relief face 13, and the oblique line segment 16 is formed on a conical segment on the relief face 13.

[0059] During machining, the rolling surface 3 on the pocket is machined by the straight line segment 15, the locking roller surface 4 on the pocket is machined by the outer convex arc segment 14, the guide surface 5 on the pocket is machined by the oblique line segment 16, the arc transition surface provided at the intersection of the rolling surface 3 and the end surface of the annular body 1 is machined by the first inner concave arc edge 17, and the arc transition surface provided at the inner edge of the guide surface 5 is machined by the second inner concave arc edge 18. The structure is simple, each structure on the axial side surface of the square pocket can be machined at one time, the machining precision is high, the machining efficiency is high, and the smooth machining of the solid retainer for cylindrical roller bearings can be ensured.

[0060] Embodiment 3

[0061] The embodiment provides the machining method of the solid retainer for cylindrical roller bearings in Embodiment 1. The rolling surface, the locking roller surface, and the guide surface on the axial side surface of the square pocket are machined by the profile milling cutter, the smooth transition between the rolling surface and the peripheral surface of the annular body, the rolling surface 3 and the locking roller surface 4, the locking roller surface 4 and the guide surface 5, and the arc transition surface (i.e., the chamfer) provided at the inner edge of the guide surface 5 are simultaneously machined by the profile milling cutter.

[0062] It should be noted that the profile milling cutter in the embodiment is the milling cutter for machining the solid retainer for cylindrical roller bearings in Embodiment 2.

[0063] It should be noted that the embodiment has all the beneficial effects of Embodiments 1 and 2, and in addition, the machining method of the solid retainer for cylindrical roller bearings in the embodiment can complete the machining of the rolling surface, the locking roller surface, the guide surface on the axial side surface of the square pocket, and the smooth transition structure between the surfaces at one time by the profile milling cutter, has high machining efficiency and high machining precision, and is convenient to operate.

[0064] It should be noted that the parts not described in detail in the present application are prior art.

[0065] In the description of the application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0066] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0067] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "setting", "connecting", "connecting", "fixing", "screwed" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0068] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be that the first feature is directly above or obliquely above the second feature, or it can only mean that the first feature is higher than the second feature in horizontal height. The first feature "below", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or it can only mean that the first feature is lower than the second feature in horizontal height.

[0069] It is to be understood that the terms "including", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises a... " does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0070] In the description of the present application, the terms "including" and / or "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises a... " does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0071] While the above-described embodiments of the application have shown and described, it is to be understood that the application can be embodied in various other forms, and that the embodiments described herein are to be considered in all respects as illustrative only, rather than restrictive. The scope of the application is indicated by the appended claims, and all changes which come within the meaning and range of equivalents are intended to be embraced therein.

Claims

1. A solid retainer for a cylindrical roller bearing, characterized by: The retaining cage comprises an integral annular body, a plurality of square pockets are formed on the annular body, each square pocket comprises two oppositely arranged radial sides and two oppositely arranged axial sides, the two axial sides are matched with the outer circumferential surface of the cylindrical roller, the two radial sides are matched with the end surface of the cylindrical roller, and each axial side is sequentially provided with a rolling surface, a lock roller surface and a guide surface from outside to inside. The lock roller surface and the guide surface extend inwardly from the inner wall of the annular body, the rolling surface is a straight surface, the straight surface is in line contact with the cylindrical roller, the lock roller surface is an inwardly recessed arc surface, and the inwardly recessed arc surface is in line contact with the cylindrical roller. The corresponding radius of the inwardly recessed arc surface is half of the distance between the two rolling surfaces in the pocket, the guide surface is an inclined surface inclined to the side away from the lock roller surface, the rolling surface, the lock roller surface and the guide surface are smoothly connected, a circular arc transition surface is arranged at the inner side edge of the guide surface, and grooves are arranged on the four corners of the square pocket in the radial direction. A cross beam is arranged between adjacent square pockets, the axial sides are formed on the cross beam, and the lock roller surface and the guide surface are formed on the boss on the inner diameter side of the cross beam. The width between the lock roller surfaces on the two bosses in the pocket is 0.1-0.15 times smaller than the diameter of the cylindrical roller.

2. The method of claim 1, wherein: The retaining cage is configured to allow the cylindrical roller to be loaded into the square pocket from one of the outer diameter side and the inner diameter side. The rolling surface, the lock roller surface and the guide surface on the axial side of the square pocket are machined by a forming milling cutter, and the smooth transitions between the rolling surface and the outer circumferential surface of the annular body, the rolling surface and the lock roller surface, the lock roller surface and the guide surface, and the circular arc transition surface arranged at the inner side edge of the guide surface are simultaneously machined. The milling cutter comprises a cutter bar, at least one cutting edge portion and a chip removal groove are arranged on the outer circumferential surface of the lower end portion of the cutter bar, the cutting edge portion comprises a rake face, a relief face and a combined cutting edge formed by the intersection of the rake face and the relief face, the blade shape curve of the combined cutting edge comprises an outwardly convex circular arc segment in the middle, a slanted line segment is connected to one side of the outwardly convex circular arc segment close to the lower end face of the cutter bar, a straight line segment is connected to the other side of the outwardly convex circular arc segment away from the cutter bar, and one end of the slanted line segment away from the outwardly convex circular arc segment is inclined to the side away from the central axis of the cutter bar. The connection between the outwardly convex circular arc segment and the straight line segment and the connection between the outwardly convex circular arc segment and the slanted line segment are smoothly connected, a first inwardly recessed circular arc blade is arranged at one end of the straight line segment away from the outwardly convex circular arc segment, a second inwardly recessed circular arc blade is arranged at one end of the slanted line segment away from the outwardly convex circular arc segment, and the connections between the first inwardly recessed circular arc blade and the straight line segment and the second inwardly recessed circular arc blade and the slanted line segment are smoothly connected. The entire cutting edge portion is recessed in the outer circumferential surface of the cutter bar, and the combined cutting edge is arranged in the axial direction of the cutter bar. The outwardly convex circular arc segment is formed on a drum-shaped segment in the middle of the relief face, the straight line segment is formed on a cylindrical segment on the relief face, and the slanted line segment is formed on a conical segment on the relief face. In processing, the rolling surface on the pocket is processed by the straight line segment, the locking roller surface on the pocket is processed by the outer convex circular arc segment, the guide surface on the pocket is processed by the inclined line segment, the circular arc transition surface provided at the intersection of the rolling surface and the end face of the annular body is processed by the first inner concave circular arc blade, and the circular arc transition surface provided at the inner side edge of the guide surface is processed by the second inner concave circular arc blade.

3. The manufacturing method of the solid retainer for a cylindrical roller bearing according to claim 2, characterized in that: The three circumferentially distributed blade portions are provided with the chip groove between any two adjacent blade portions, and the chip groove is a V-shaped groove; and the rake face is a side wall surface of the chip groove.

Images