Processing method of ball pocket of deep groove ball cage

Abstract

The present invention relates to a method for machining a ball-shaped pocket hole of a deep groove ball retainer, comprising the following steps: 1) rough machining the pocket hole, using a formed rough boring tool to rough machine the pocket hole; the formed rough boring tool comprises an integrally arranged first tool bar and a first tool body, two side edges are evenly distributed along the circumference of the first tool body, the side edges are composed of multiple sections of stepped cutting edges, and each section of the cutting edge is conical; 2) fine machining the pocket hole, using a formed ball-end fine boring tool to fine machine the pocket hole; the formed ball-end fine boring tool comprises an integrally formed second tool bar and a second tool body, the second tool body comprises a columnar portion and a formed spherical surface arranged at the front end of the columnar portion, the second tool body is provided with a formed spherical surface, a single ball-end edge is arranged on the formed spherical surface, and the central cutting edge at the front end of the single ball-end edge exceeds the center of the second tool body. It has high machining accuracy and high machining efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of bearing retainer processing, in particular to a method for processing ball pockets of deep groove ball retainers. Background Art

[0002] The existing pocket of a deep groove ball cage is spherical in shape, the upper end surface of the pocket is chamfered, and the depth and angle of the chamfer are required. In addition, due to the large diameter of the pocket and the small tolerance, the processing is difficult and the efficiency is low.

[0003] like Figure 5-6 As shown, the existing processing method is divided into three steps:

[0004] 1. Rough milling of pocket holes: Use a standard milling cutter to rough-mill the pocket holes. Because the pocket holes are spherical, the side walls of the pocket holes are irregularly serrated after rough machining.

[0005] 2. Fine milling of pocket holes: Use standard milling cutter to finely machine pocket holes;

[0006] 3. Chamfer the end face of the pocket hole; use a 90° chamfering tool to chamfer the upper end face of the pocket hole.

[0007] After rough machining in process 1, the side wall of the pocket hole presents an irregular serrated shape. When finishing the pocket hole, the tool is constantly performing intermittent cutting, and the machining allowance is uneven. The feed speed of the finishing tool is relatively slow, and the tool life is low. After finishing in process 2, there is always a convex point at the lowest point of the pocket hole (center position), which affects assembly and use. During the chamfering of the pocket hole end face in process 3, due to the large chamfering depth, the chamfering tool needs to process a circle on the pocket hole end face according to the pocket hole contour path at a very slow speed, and the processing efficiency is particularly low. Summary of the invention

[0008] In view of the deficiencies in the prior art, an object of the present invention is to provide a method for machining ball pockets of a deep groove ball cage to solve the problems raised in the above background technology.

[0009] In order to achieve the above object, the present invention adopts the following technical solutions:

[0010] The method for processing a ball pocket of a deep groove ball cage comprises the following steps:

[0011] 1) Rough machining of pocket holes, using a profiled rough boring tool to perform rough machining of pocket holes; the profiled rough boring tool comprises a first tool bar and a first tool body which are integrally arranged, two side edges are evenly distributed along the circumference of the first tool body, the side edges are composed of multiple sections of stepped cutting edges, and each section of the cutting edge is tapered;

[0012] 2) Finishing the pocket hole by using a formed ball-end fine boring cutter; the formed ball-end fine boring cutter comprises an integrally formed second tool bar and a second tool body, the second tool body is provided with a formed spherical surface, a single ball-end cutting edge is provided on the formed spherical surface, and the central cutting edge at the front end of the single ball-end cutting edge exceeds the center of the second tool body.

[0013] Furthermore, the multiple sections of the cutting edge include a chamfering edge close to one end of the first shank and a first cutting edge, a second cutting edge and a third cutting edge connected to the chamfering edge in sequence, wherein the first intersection of the first cutting edge and the chamfering edge on the radial section, the second intersection of the first cutting edge and the second cutting edge on the radial section, the third intersection of the second cutting edge and the third cutting edge on the radial section and the tip of the third cutting edge corresponding to the third intersection away from the third intersection are cocircular.

[0014] Furthermore, the radii of the circles corresponding to the first intersection point, the second intersection point and the third intersection point on the axial cross section become smaller in sequence.

[0015] Furthermore, the angle between the chamfering edge and the central axis of the first tool body is 45 degrees; the angle between the third cutting edge corresponding to the tool tip and the central axis of the first tool body is 75 degrees.

[0016] Furthermore, two first chip removal grooves are symmetrically arranged on the first tool body along the axial direction, and the two chip removal grooves are correspondingly arranged between the two side edges.

[0017] Furthermore, the second tool body also includes a columnar portion connecting the molded spherical surface and the second tool rod, and the rear end of the single ball-end cutting edge extends toward the columnar portion.

[0018] Furthermore, the distance that the center edge of the single ball-end cutting edge exceeds the center of the second cutting body is 0.5 mm.

[0019] Furthermore, a second chip removal groove is provided on the second tool body, and the second chip removal groove is arranged on a side of the formed spherical surface away from the single ball-end cutting edge.

[0020] Furthermore, the first knife bar and the first knife body are both coaxially arranged rotating bodies, and the second knife bar and the second knife body are both coaxially arranged rotating bodies.

[0021] The beneficial effects of the present invention compared with the prior art are:

[0022] The present invention provides a method for processing a ball pocket of a deep groove ball cage, comprising the following steps:

[0023] 1) Rough machining of pocket holes, using a profiled rough boring tool to perform rough machining of pocket holes; the profiled rough boring tool comprises a first tool bar and a first tool body which are integrally arranged, two side edges are evenly distributed along the circumference of the first tool body, the side edges are composed of multiple sections of stepped cutting edges, and each section of the cutting edge is tapered;

[0024] 2) Finishing the pocket hole, using a formed ball-end fine boring tool to finish the pocket hole; the formed ball-end fine boring tool comprises an integrally formed second tool bar and a second tool body, the second tool body comprises a columnar portion and a formed spherical surface arranged at the front end of the columnar portion, the second tool body is provided with a formed spherical surface, a single ball-end blade is arranged on the formed spherical surface, and the central cutting edge at the front end of the single ball-end blade exceeds the center of the second tool body. It has high processing accuracy and high processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic structural diagram of a forming rough boring tool according to an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the use state of the forming rough boring tool according to the embodiment of the present invention;

[0027] Figure 3 It is a schematic structural diagram of a formed ball-end fine boring cutter according to an embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of the use state of the formed ball head fine boring cutter according to the embodiment of the present invention;

[0029] Figure 5 It is a schematic diagram of rough machining of pocket holes in the prior art;

[0030] Figure 6 It is a schematic diagram of processing the chamfering of the end face of the pocket hole in the prior art.

[0031] In the figure: 1. formed rough boring tool, 1.1. first tool bar, 1.2. first tool body, 1.3. side edge, 1.3.1. chamfering edge, 1.3.2. first cutting edge, 1.3.3. second cutting edge, 1.3.4. third cutting edge, 1.4. tool tip, 1.5. first chip groove, 2. formed ball nose fine boring tool, 2.1. second tool bar, 2.2. second tool body, 2.2.1. columnar part, 2.2.2. formed spherical surface, 2.2.3. ball nose edge, 2.2.4. center cutting edge, 2.2.5. second chip groove, 3. spherical pocket, 4. chamfer. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0033] Example 1

[0034] like Figure 1-4 As shown, a method for processing a ball pocket of a deep groove ball retainer is characterized in that it comprises the following steps:

[0035] 1) Rough machining of pocket holes: use a formed rough boring tool to rough machine the pocket holes; 2) Finish machining of pocket holes: use a formed ball-end finishing boring tool to finish the pocket holes.

[0036] The forming rough boring tool 1 of this embodiment includes a first tool bar 1.1 and a first tool body 1.2 which are integrally arranged. The first tool bar 1.1 and the first tool body 1.2 are both coaxially arranged rotating bodies. Two side cutting edges 1.3 are evenly distributed along the circumference of the first tool body 1.2. The two side cutting edges 1.3 are composed of multiple sections of stepped cutting edges, and each section of the cutting edge is conical.

[0037] Specifically, the multi-segment cutting edge includes a chamfering edge 1.3.1 near one end of the first shank 1.1 and a first cutting edge 1.3.2, a second cutting edge 1.3.3 and a third cutting edge 1.3.4 connected to the chamfering edge 1.3.1 in sequence, wherein the first intersection of the first cutting edge 1.3.2 and the chamfering edge 1.3.1 on the radial section, the second intersection of the first cutting edge 1.3.2 and the second cutting edge 1.3.3 on the radial section, the third intersection of the second cutting edge 1.3.3 and the third cutting edge 1.3.4 on the radial section and the tip 1.4 of the third cutting edge 1.3.4 away from the third intersection are cocircular. The radii of the circles corresponding to the first intersection, the second intersection and the third intersection on the axial section become smaller in sequence.

[0038] It should be noted that the arrangement of the stepped cutting edge can minimize the contact area between the tool and the workpiece, thereby reducing the cutting resistance and making the workpiece deform less. The size of each section of the tool is left with a machining allowance according to the size of the spherical pocket hole 3, so that the allowance of the spherical pocket hole 3 after rough machining is uniform and consistent, the surface roughness is good, the allowance of fine machining is reduced, and the cutting speed of the fine machining tool can be increased. The upper end of the rough machining tool also has a chamfering 4 function.

[0039] In order to improve the processing accuracy, the angle between the chamfering edge 1.3.1 and the central axis of the first tool body 1.2 in this embodiment is 45 degrees, that is, the angle between the two chamfering edges 1.3.1 is 90 degrees; the angle between the third cutting edge 1.3.4 corresponding to the tool tip 1.4 and the central axis of the first tool body 1.2 is 75 degrees, that is, the tool tip 1.4 is designed to be at an angle of 150 degrees.

[0040] In order to facilitate chip removal, in this embodiment, two first chip removal grooves 1.5 are symmetrically arranged along the axial direction on the first tool body 1.2, and the two first chip removal grooves 1.5 are correspondingly arranged between the two side edges 1.3.

[0041] The formed ball-end fine boring tool 2 of this embodiment is used for fine machining of the spherical pocket 3 after the formed rough boring tool 1 is machined, and includes an integrally formed second tool bar 2.1 and a second tool body 2.2, both of which are coaxially arranged rotating bodies. The second tool body 2.2 includes a columnar portion 2.2.1 and a formed spherical surface 2.2.2 arranged at the front end of the columnar portion 2.2.1, the rear end of the columnar portion 2.2.1 is connected to the second tool bar 2.1, and a single ball-end cutting edge 2.2.3 is arranged on the formed spherical surface 2.2.2, the center cutting edge 2.2.4 at the front end of the single ball-end cutting edge 2.2.3 exceeds the center of the second tool body 2.2, and the rear end of the single ball-end cutting edge 2.2.3 extends toward the columnar portion 2.2.1. Preferably, the distance L by which the center cutting edge 2.2.4 of the single ball-end cutting edge 2.2.3 exceeds the center of the second tool body 2.2 is 0.5 mm.

[0042] It should be noted that the ball-end cutting edge 2.2.3 in this embodiment is composed of abrasive grains sintered on the second tool body 2.2.

[0043] In order to facilitate chip removal, a second chip removal groove 2.2.5 is provided on the second tool body 2.2 of this embodiment. The second chip removal groove 2.2.5 is arranged on the side of the molded spherical surface 2.2.2 away from the single ball-end cutting edge 2.2.3.

[0044] During the rough machining process, the depth of the rough machining tool feed is adjusted according to the requirements of the chamfer 4 of the end face of the spherical pocket 3, thereby adjusting the size of the chamfer 4. If the chamfer 4 is too small, the forming rough boring tool 1 moves in the Z- direction, and if the chamfer 4 is too large, the forming rough boring tool 1 moves in the Z+ direction. In this way, the forming rough boring tool 1 can not only perform rough machining of the spherical pocket 3, but also process the chamfer 4 of the end face of the spherical pocket 3, and its size can be adjusted, which saves the time of processing the chamfer 4 in a single process and improves efficiency. The tip 1.4 of the forming rough boring tool 1 is designed to be 150°, which not only ensures the stability of the tool centering during the machining process, but also ensures the strength of the tip 1.4. The tip 1.4 is not easy to break, which increases the life of the tool.

[0045] It should be noted that, in the double-edged or multi-edged ball-end tool in the prior art, during the manufacturing process, each blade will intersect at the center of the tool, and the intersection is the center point of the spherical pocket 3. Because it is impossible for each blade to be completely consistent in height, a relatively obvious cutting mark will appear in the center of the processed spherical pocket 3. The single ball-end cutting edge 2.2.3 provided in the forming ball-end fine boring tool 2 of this embodiment and the central cutting edge 2.2.4 of the single ball-end cutting edge 2.2.3 exceeds the center of the second tool body 2.2 can avoid the problem of the above-mentioned cutting mark.

[0046] In addition, in the prior art, when finishing the spherical pocket 3, when the center point of the tool is processed to the center of the spherical pocket 3, the tool is in a process of extrusion deformation, rather than cutting. In this way, there will be an extrusion deformed convex point in the center of the spherical pocket 3. This convex point will scratch the steel ball and rotate unevenly during assembly, which will eventually affect the dynamic balance of the bearing.

[0047] The center of the formed ball-end fine boring tool 2 is processed by over-centering, so that when the center of the tool is processed to the bottom of the spherical pocket 3, the over-center blade will cut the center to remove the original convex point, and there will be no vibration marks or runout problems.

[0048] The beneficial effects of this embodiment compared with the prior art are:

[0049] In this embodiment, the pocket hole is rough-machined by a formed rough boring tool 1, and then the pocket hole is fine-machined by a formed ball-end fine boring tool 2 to obtain a spherical pocket hole 3. During the rough machining, the working hours of the final spherical pocket hole end face chamfering are saved, and the fine machining allowance is reduced, thereby reducing the product deformation problem during the rough machining process. At the same time, the surface quality of the spherical pocket hole 3 can be guaranteed during the fine machining, and the machining efficiency is significantly improved.

[0050] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0051] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0052] In the present invention, unless otherwise clearly specified and limited, the terms "install", "set", "connect", "connect", "fix", "screw" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean 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, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0054] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0055] In the description of the present invention, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0056] Although the embodiments of the present invention have been shown and described above, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for processing a deep groove ball cage ball pocket, characterized in that: The following steps are involved: 1) Rough machining of pocket holes, using a profiled rough boring tool to perform rough machining of pocket holes; the profiled rough boring tool comprises a first tool bar and a first tool body which are integrally arranged, two side edges are evenly distributed along the circumference of the first tool body, the side edges are composed of multiple sections of stepped cutting edges, and each section of the cutting edge is tapered; 2) Finishing the pocket hole by using a formed ball-end fine boring cutter; the formed ball-end fine boring cutter comprises an integrally formed second tool bar and a second tool body, the second tool body is provided with a formed spherical surface, a single ball-end cutting edge is provided on the formed spherical surface, and a central cutting edge at the front end of the single ball-end cutting edge exceeds the center of the second tool body; The multi-section stepped cutting edges include a chamfering edge close to one end of the first shank and a first cutting edge, a second cutting edge and a third cutting edge connected to the chamfering edge in sequence, wherein a first intersection of the first cutting edge and the chamfering edge on a radial section, a second intersection of the first cutting edge and the second cutting edge on a radial section, a third intersection of the second cutting edge and the third cutting edge on a radial section and a tip of the third cutting edge away from the third intersection are in a common circle; the radii of the circles corresponding to the first intersection, the second intersection and the third intersection on an axial section become smaller in sequence.

2. The method for processing ball pockets of a deep groove ball cage according to claim 1, characterized in that: The angle between the chamfering edge and the central axis of the first tool body is 45 degrees; the angle between the third cutting edge corresponding to the tool tip and the central axis of the first tool body is 75 degrees.

3. The method for processing ball pockets of a deep groove ball cage according to claim 1 or 2, characterized in that: The first tool body is provided with two first chip removal grooves symmetrically along the axial direction, and the two first chip removal grooves are correspondingly arranged between the two side edges.

4. The method for processing ball pockets of a deep groove ball cage according to claim 1, characterized in that: The second tool body further includes a columnar portion connecting the molded spherical surface and the second tool rod, and the rear end of the single ball-end cutting edge extends toward the columnar portion.

5. The method for processing ball pockets of a deep groove ball cage according to claim 4, characterized in that: The distance that the center edge of the single ball-end cutting edge exceeds the center of the second cutting body is 0.5 mm.

6. The method for processing ball pockets of a deep groove ball cage according to claim 4 or 5, characterized in that: The second tool body is provided with a second chip removal groove, and the second chip removal groove is arranged on a side of the formed spherical surface away from the single ball-end cutting edge.

7. The method for processing ball pockets of a deep groove ball cage according to claim 1, characterized in that: The first knife bar and the first knife body are both coaxially arranged rotating bodies, and the second knife bar and the second knife body are both coaxially arranged rotating bodies.

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