Bearing inner ring superfinishing machine pre-tightening clamp device, bearing inner ring superfinishing machine

Abstract

The application provides a bearing inner ring superfinishing machine pre-tightening clamp device and a bearing inner ring superfinishing machine, and belongs to the technical field of bearing superfinishing, wherein the pre-tightening clamp device comprises a centering clamping assembly and a rolling support loading assembly, the rolling support loading assembly comprises a positioning shaft and a rolling bearing assembly, the rolling bearing assembly comprises two loading bearings, the rolling support loading assembly applies axial pressure to the end face of the second end of the bearing inner ring through the two loading bearings, the positioning shaft comprises a first shaft section and a second shaft section, and the first shaft section and the second shaft section are connected through a pre-tightening elastic piece. The application relies on the elastic compensation effect of the pre-tightening elastic piece, so that the axial pressure applied by the axial pressure maintaining device can be finally more uniformly applied to the end face of the second end of the bearing inner ring, the occurrence of the loosening phenomenon of the bearing inner ring due to the limited adjustment ability of uneven loading in the superfinishing process is effectively prevented, and therefore the superfinishing quality of the bearing inner ring is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of bearing superfinishing, and particularly relates to a bearing inner ring superfinishing machine pre-tightening clamp device and a bearing inner ring superfinishing machine. BACKGROUND

[0002] In order to improve the contact quality between the bearing inner ring raceway (specifically, the inner ring raceway of an angular contact ball bearing) and the rolling element, the contact surface roughness should be small, so as to reduce the noise during use of the bearing and improve the service life of the bearing. The angular contact ball bearing is subjected to rough machining, fine machining and finishing, and then is subjected to superfinishing. In the superfinishing process, the bearing raceway is subjected to superfinishing by means of a bearing inner ring superfinishing auxiliary clamp. The bearing superfinishing auxiliary clamp has a centering shaft for bearing sleeving. The centering shaft is connected with a driving device on the superfinishing machine. The centering shaft has a chuck for fixing the bearing. One end of the bearing inner ring (for the angular contact ball bearing, the large-diameter end) is a machining reference surface, which is centered and connected with the chuck and rotates with the chuck. The other side of the bearing inner ring is connected with a constant-pressure assembly, which ensures that the bearing inner ring is provided with axial pressure, so that the reference surface of the bearing inner ring is always in contact with the chuck during rotation of the bearing inner ring.

[0003] The bearing inner ring is in a loaded state during loading by the constant-pressure assembly. During this process, an axial counterforce opposite to the axial force direction of the constant-pressure assembly is generated. In the prior art, two auxiliary loading bearings are respectively connected to the two ends of a cylindrical shaft, and the cylindrical shaft is inserted and positioned in the cylindrical hole of the positioning shaft. There is only a very small assembly gap between the cylindrical shaft and the cylindrical hole. The adjustment ability of the bearing inner ring under uneven axial loading is limited. That is, the adjustment ability of the constant-pressure assembly under uneven axial loading of the bearing inner ring is limited. The contact between the auxiliary loading bearing and the end surface of the bearing inner ring changes from linear contact to point contact during the loading process. The load at the contact position increases, which causes the bearing inner ring to be easily loosened during superfinishing, thereby reducing the superfinishing quality (precision) of the bearing inner ring. In order to overcome the foregoing deficiencies of the prior art, the application is proposed. SUMMARY

[0004] Therefore, the application provides a bearing inner ring superfinishing machine pre-tightening clamp device and a bearing inner ring superfinishing machine, which can solve the technical problem that the adjustment ability of the constant-pressure assembly in the bearing inner ring superfinishing machine pre-tightening clamp device in the prior art is limited under uneven axial loading of the bearing inner ring. The contact between the auxiliary loading bearing and the end surface of the bearing inner ring changes from linear contact to point contact during the loading process. The load at the contact position increases, which causes the bearing inner ring to be easily loosened during superfinishing, thereby reducing the superfinishing quality (precision) of the bearing inner ring.

[0005] In order to solve the above problems, the present application provides a bearing inner ring superfinishing machine pre-tightening clamp device, which comprises a centering clamping assembly and a rolling support loading assembly, the centering clamping assembly can be driven to rotate and can center and clamp the first end of the bearing inner ring, the rolling support loading assembly comprises a positioning shaft and a rolling bearing assembly connected to the positioning shaft, the rolling bearing assembly comprises two loading bearings, the rolling support loading assembly applies axial pressure to the end face of the second end of the bearing inner ring through the two loading bearings, the positioning shaft comprises a first shaft section and a second shaft section, the rolling bearing assembly is assembled on the first shaft section, the second shaft section is used for being connected with an axial pressure setting device, and the first shaft section and the second shaft section are connected through a pre-tightening elastic piece.

[0006] In some embodiments, the pre-tightening elastic piece has a plurality of pre-tightening elastic pieces, and the plurality of pre-tightening elastic pieces are arranged at intervals along the circumferential direction of the bearing inner ring.

[0007] In some embodiments, a plurality of accommodation grooves are respectively arranged on the opposite two end faces of the first shaft section and the second shaft section, and the two ends of the pre-tightening elastic piece are respectively accommodated and connected in each of the accommodation grooves; and / or, the two ends of the pre-tightening elastic piece are respectively fixedly connected to the opposite two end faces of the first shaft section and the second shaft section.

[0008] In some embodiments, one end of the first shaft section away from the second shaft section has a positioning mandrel, the positioning mandrel is inserted into the center through hole of the bearing inner ring, and the positioning mandrel and the center through hole have an assembly gap therebetween.

[0009] In some embodiments, a lubricating oil flow channel is constructed in the first shaft section, and the outlet of the lubricating oil flow channel is constructed on the outer circumferential wall of the positioning mandrel.

[0010] In some embodiments, the outlet has a plurality of outlets, and the plurality of outlets are arranged at intervals along the circumferential direction of the positioning mandrel; and / or, the outer side of the bearing inner ring is further provided with a lubricating oil spraying device.

[0011] In some embodiments, the rolling bearing assembly further comprises a swing shaft, the shaft diameter of the swing shaft becomes larger and larger from the end position to the middle position along the axial direction thereof, the two loading bearings are respectively arranged at the two ends of the swing shaft, an assembly hole is constructed in the first shaft section along the radial direction thereof, the assembly hole is a cylindrical hole, the middle position of the swing shaft has a rotating shaft, and in the process of superfinishing the bearing inner ring, the swing shaft can be driven to swing around the rotating shaft when the bearing inner ring is unevenly loaded.

[0012] In some embodiments, the pivot is a bolt, the bolt's thread is threaded to the first shaft segment, and the swing shaft is fitted onto the thread.

[0013] In some embodiments, the end of the second shaft segment away from the first shaft segment has a threaded connection; and / or, the outer circumferential wall of the second shaft segment has a groove.

[0014] The present invention also provides a bearing inner ring ultra-precision machine, including the above-mentioned bearing inner ring ultra-precision machine pre-tightening clamp device.

[0015] This invention provides a pre-tightening fixture device and a bearing inner ring ultra-precision machine. A pre-tightening elastic element is set between the first shaft section and the second shaft section. Relying on the elastic compensation effect of the pre-tightening elastic element, the axial pressure applied by the axial pressure fixing device to the rolling support loading assembly can be applied more evenly to the second end face of the bearing inner ring. The end face of the loaded bearing and the bearing inner ring always maintains line contact, effectively preventing the loosening of the bearing inner ring due to uneven load adjustment capacity during the ultra-precision process, thereby improving the ultra-precision machining quality of the bearing inner ring. Attached Figure Description

[0016] Figure 1 This is a front view of the bearing inner ring ultra-precision machine pre-tightening fixture device according to an embodiment of the present invention;

[0017] Figure 2 for Figure 1 Perspective view of the components;

[0018] Figure 3 for Figure 2 A partial cross-sectional view of AA in the middle section;

[0019] Figure 4 for Figure 1 A top-view structural diagram;

[0020] Figure 5 for Figure 4 Perspective view of the components;

[0021] Figure 6 for Figure 1 A schematic diagram of the rolling bearing assembly.

[0022] The reference numerals in the attached figures are as follows:

[0023] 1, centering clamping assembly; 2, rolling support loading assembly; 21, positioning shaft; 211, first shaft segment; 2111, threaded connecting piece; 2112, clamping groove; 212, second shaft segment; 2121, assembly hole; 213, pre-tightening elastic piece; 214, positioning mandrel; 215, lubricating oil flow channel; 2151, outlet; 2152, inlet; 2153, oil inlet joint; 22, rolling bearing assembly; 221, loading bearing; 222, swing shaft; 223, rotating shaft; 224, screw; 225, gasket; 100, bearing inner ring; 200, oil stone. DETAILED DESCRIPTION

[0024] CONJUNCTION WITH Figures 1 to 6 As shown, according to the embodiment of the present application, a bearing inner ring superfinishing machine pre-tightening clamp device is provided, which comprises a centering clamping assembly 1 and a rolling support loading assembly 2. The centering clamping assembly 1 can be driven to rotate and can center and clamp the first end of the bearing inner ring 100. Specifically, the centering clamping assembly 1 comprises a centering shaft and a chuck (not shown in the figure) above the centering shaft. The bearing inner ring 100 is clamped and centered by the aforementioned chuck. The centering shaft is driven to rotate by the rotating driving part (not shown in the figure) of the bearing inner ring superfinishing machine, thereby driving the bearing inner ring 100 to rotate. As shown in Figure 1 As shown, the oil stone 200 is arranged adjacent to the bearing inner ring 100 and matches the raceway on the outer sidewall of the bearing inner ring 100 to achieve superfinishing of the raceway. The rolling support loading assembly 2 comprises a positioning shaft 21 and a rolling bearing assembly 22 connected to the positioning shaft 21. The positioning shaft 21 exerts axial pressure (also referred to as axial pressing force) on the bearing inner ring 100 under the action of an axial pressure device (not shown in the figure, which can be one of the parts of the bearing inner ring superfinishing machine). The rolling bearing assembly 22 comprises two loading bearings 221. The rolling support loading assembly 2 exerts axial pressure on the end face of the second end of the bearing inner ring 100 through the two loading bearings 221. In this way, when the bearing inner ring 100 is driven to rotate, the two loading bearings 221 roll under the action of the friction force between them and the end face of the second end, thereby achieving axial pressure on the bearing inner ring 100 while minimizing the friction force. The positioning shaft 21 comprises a first shaft segment 211 and a second shaft segment 212. The rolling bearing assembly 22 is assembled on the first shaft segment 211. The second shaft segment 212 is used to connect with the axial pressure device. The first shaft segment 211 and the second shaft segment 212 are connected through the pre-tightening elastic piece 213.

[0025] In this technical solution, a pre-tightening elastic element 213 is provided between the first shaft segment 211 and the second shaft segment 212. Relying on the elastic compensation effect of the pre-tightening elastic element 213, the axial pressure applied by the axial constant pressure device to the rolling support loading assembly 2 can be applied more evenly to the second end face of the bearing inner ring 100. The loading bearing 221 and the end face of the bearing inner ring 100 always maintain line contact, effectively preventing the bearing inner ring 100 from loosening due to uneven load adjustment capacity during the ultra-precision process, thereby improving the ultra-precision machining quality of the bearing inner ring 100.

[0026] See details Figure 1 As shown, the first end of the aforementioned bearing inner ring 100, that is, the end facing the centering clamping assembly 1, serves as the reference surface for positioning and centering the bearing inner ring 100 (e.g., Figure 1 As shown in Figure A), the second end is the end facing the rolling support loading component 2. This end face serves as the force-bearing surface for the aforementioned axial pressure, ensuring that the first end is in close contact with the centering clamping component 1. Specifically, for the inner ring of the angular contact bearing, the aforementioned first end is the large diameter end, and the aforementioned second end is the small diameter end.

[0027] The aforementioned preload elastic element 213 can be a single, large-diameter annular spring. The outer diameter of this annular spring should be slightly smaller than the outer diameter of the opposite ends of the two shaft segments. In a specific embodiment, multiple preload elastic elements 213 are provided, spaced apart along the circumferential direction of the bearing inner ring 100, specifically at equal intervals. Compared to using a single annular spring, using multiple preload elastic elements 213 disperses the torque generated under uneven load, reducing the torque on a single spring and extending the overall service life of the preload elastic elements 213. Specifically, the aforementioned preload elastic element 213 can be a spring with suitable stiffness. It is understood that after the preload elastic element 213 is assembled between the first shaft segment 211 and the second shaft segment 212, its axial displacement compensation deformation should be sufficient, i.e., the axial gap formed between the first shaft segment 211 and the second shaft segment 212 (…). Figure 1 The clearance extending in the left and right directions should always be greater than zero during the ultra-precision machining of the inner ring 100 of the bearing.

[0028] Specifically, in one embodiment, the first shaft segment 211 and the second shaft segment 212 are respectively provided with a plurality of accommodating grooves on the opposite two end faces, and the two ends of the pre-tightening elastic member 213 are respectively accommodated and connected in the respective accommodating grooves. The two ends of the pre-tightening elastic member 213 are respectively accommodated in the corresponding accommodating grooves, the accommodating grooves can guide the deformation of the pre-tightening elastic member 213, and ensure the reliability and stability of the structure; in another specific embodiment, the two ends of the pre-tightening elastic member 213 are respectively fixedly connected to the opposite two end faces of the first shaft segment 211 and the second shaft segment 212. For example, when the pre-tightening elastic member 213 is a metal spring, the two ends of the metal spring are respectively welded on the first shaft segment 211 and the second shaft segment 212, which can improve the compactness of the positioning shaft 21. Of course, a more preferred solution is that the two ends of the pre-tightening elastic member 213 are respectively fixedly connected in the corresponding accommodating grooves, so that the advantages of the above two are both possessed.

[0029] In some embodiments, the end of the first shaft segment 211 away from the second shaft segment 212 has a positioning mandrel 214, the positioning mandrel 214 is inserted into the center through hole of the bearing inner ring 100, and the positioning mandrel 214 and the center through hole have an assembly gap, that is, the positioning mandrel 214 is inserted into the center through hole in a clearance fit manner, which can prevent the rotating bearing inner ring 100 from being separated from the chuck, and ensure the safety of superfinishing.

[0030] Referring to Figure 2 As shown, the first shaft segment 211 is configured with a lubricating oil flow channel 215, the outlet 2151 of the lubricating oil flow channel 215 is configured on the outer circumferential wall of the positioning mandrel 214, the inlet 2152 of the lubricating oil flow channel 215 is connected with an oil inlet joint 2153, the external lubricating oil flows into the lubricating oil flow channel 215 through the oil inlet joint 2153 and flows out from the outlet 2151, realizing the lubrication between the center through hole of the bearing inner ring 100 and the positioning mandrel 214. More importantly, in this technical solution, the lubricating oil is introduced into the center through hole of the bearing inner ring 100 through the outlet 2151, so that the bearing inner ring 100 can be effectively cooled on the inside, and the heat generated between the oil stone 200 and the bearing inner ring 100 during the superfinishing process can be more effectively removed, improving the processing quality and precision. Of course, a more preferred solution is that a lubricating oil spraying device (not shown in the figure) is also provided on the outside of the bearing inner ring 100, which sprays and lubricates and cools the outside of the bearing inner ring 100, and the lubricating oil flowing out of the outlet 2151 of the lubricating oil flow channel 215 together realizes the purpose of lubrication and cooling of the bearing inner ring 100 from inside and outside, effectively improving the quality of superfinishing. In one specific embodiment, the outlet 2151 has a plurality of outlets 2151, which are arranged at intervals along the circumference of the positioning mandrel 214, such as Figure 3As shown, three outlets 2151 are shown, and one lubricating oil channel 215 is used to supply oil to the three outlets 2151, which simplifies the structure and realizes balanced cooling of the central through hole of the bearing inner ring 100, and such balanced cooling can ensure the uniformity of the temperature rise of the bearing inner ring 100 in the circumferential direction, which can significantly improve the superfinishing quality.

[0031] Specifically referring to Figure 6 As shown, the rolling bearing assembly 22 further comprises a swing shaft 222, the shaft diameter of the swing shaft 222 is larger from the end position to the middle position along the axial direction, and two loading bearings 221 are respectively arranged at the two ends of the swing shaft 222. For details, see Figure 5 and Figure 6 As shown, each loading bearing 221 is sleeved on a screw 224, and the screw 224 is threadedly connected to the shaft end of the swing shaft 222. The axis of the screw 224 coincides with the axis of the swing shaft 222. The screw rod of the screw 224 is sleeved with a gasket 225, and the screw head of the screw 224 and the gasket 225 together form a clamping of the inner ring of the loading bearing 221 with the shaft end of the swing shaft 222. The outer ring of the loading bearing 221 is in rolling contact with the second end face of the bearing inner ring 100. The first shaft section 211 is provided with an assembly hole 2121 penetrating in the radial direction thereof. The assembly hole 2121 is a cylindrical hole. The middle position of the swing shaft 222 has a rotating shaft 223. During the superfinishing process of the bearing inner ring 100, the swing shaft 222 can be driven to swing around the rotating shaft 223 when the bearing inner ring 100 is unevenly loaded. In this technical solution, the shaft diameter of the swing shaft 222 is smaller from the middle position to the shaft end position, that is, the swing shaft 222 forms an axis body spliced by two conical shaft sections. In this way, a gap is formed between the swing shaft 222 and the assembly hole 2121 which is a cylindrical hole. This gap allows the swing shaft 222 to swing around the rotating shaft 223 to form a certain deflection angle when the bearing inner ring 100 is unevenly loaded during the superfinishing process, thereby further improving the loading uniformity of the rolling support loading assembly to the bearing inner ring 100, and further effectively preventing the loosening phenomenon of the bearing inner ring due to the limited adjustment ability of the uneven loading during the superfinishing process, and improving the superfinishing quality of the bearing inner ring. Especially, under the joint action of the aforementioned pre-tightening elastic member, the adjustment ability when the bearing inner ring is unevenly loaded can be further improved.

[0032] Specifically, the rotating shaft 223 can be implemented by a bolt, a shank of the bolt is threadedly connected with the first shaft segment 211 and the swing shaft 222 is sleeved on the shank, at this time, the swing shaft 222 and the shank are not engaged but only sleeved to realize smoothness of swing, the thread connection between the shank and the first shaft segment 211 realizes reliable positioning of the swing shaft 222 in axial and radial directions, and the structure is simple. In a more preferable embodiment, the head of the shank is threadedly connected with the first shaft segment 211 through the swing shaft 222, that is, the tail of the shank (a position connected with the screw head) and the head are both threadedly connected with the first shaft segment 211, and the middle part of the shank is sleeved with the swing shaft 222, so that the structure realizes support of both ends of the rotating shaft 223 instead of cantilever support, and the positioning structure strength of the shank to the swing shaft 222 can be improved.

[0033] Specifically referring to Figure 4 As shown, the second shaft segment 212 has a threaded connecting piece 2111 at one end away from the first shaft segment 211, the second shaft segment 212 is detachably connected with the axial pressure fixing device through the threaded connecting piece 2111, and the detachable connection is convenient; in order to reliably limit the circumferential displacement of the positioning shaft 21, the outer circumferential wall of the second shaft segment 212 has a clamping groove 2112.

[0034] According to the embodiment of the present application, a bearing inner ring superfinishing machine pre-tightening clamp device is also provided.

[0035] Those skilled in the art can understand that the advantageous technical features of each mode described above can be freely combined and superimposed without conflict.

[0036] The above is only a preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above is only a preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A bearing inner ring superfinishing pre-tightening fixture device, comprising a centering clamping assembly (1) and a rolling support loading assembly (2), the centering clamping assembly (1) being capable of being driven to rotate and capable of centering clamping a first end of a bearing inner ring (100), the rolling support loading assembly (2) comprising a positioning shaft (21) and a rolling bearing assembly (22) connected to the positioning shaft (21), the rolling bearing assembly (22) comprising two loading bearings (221), the rolling support loading assembly (2) applying axial pressure to an end face of a second end of the bearing inner ring (100) through the two loading bearings (221), characterized in that, The positioning shaft (21) comprises a first shaft section (211) and a second shaft section (212), the rolling bearing assembly (22) is assembled on the first shaft section (211), the second shaft section (212) is used for being connected with an axial pressure maintaining device, the first shaft section (211) and the second shaft section (212) are connected through a pre-tightening elastic element (213), the rolling bearing assembly (22) further comprises a swing shaft (222), the shaft diameter of the swing shaft (222) is larger and larger from an end position to a middle position along the axial direction, two loading bearings (221) are respectively arranged at two ends of the swing shaft (222), the first shaft section (211) is provided with an assembly hole (2121) penetrating along the radial direction, the assembly hole (2121) is a cylindrical hole, the middle position of the swing shaft (222) has a rotating shaft (223), during the superfinishing process of the bearing inner ring (100), the swing shaft (222) can be driven to swing around the rotating shaft (223) when the bearing inner ring (100) is unevenly loaded, so that the loading bearing (221) and the end surface of the bearing inner ring (100) always keep linear contact.

2. The pre-tightening clamp device according to claim 1, characterized in that, The pre-tightening elastic element (213) has a plurality of pre-tightening elastic elements (213) which are arranged at intervals along the circumferential direction of the bearing inner ring (100).

3. The pre-tightening clamp device according to claim 2, characterized in that, The opposite two end faces of the first shaft section (211) and the second shaft section (212) are respectively provided with a plurality of accommodation grooves, and the two ends of the pre-tightening elastic element (213) are respectively accommodated and connected in each of the accommodation grooves; and / or, the two ends of the pre-tightening elastic element (213) are respectively fixedly connected to the opposite two end faces of the first shaft section (211) and the second shaft section (212).

4. The pre-tightening clamp device according to claim 1, characterized in that, The end of the first shaft section (211) away from the second shaft section (212) has a positioning mandrel (214), the positioning mandrel (214) is inserted into the center through hole of the bearing inner ring (100), and the positioning mandrel (214) and the center through hole have an assembly gap.

5. The pre-tightening clamp device according to claim 4, characterized in that, The first shaft section (211) is provided with a lubricating oil flow channel (215), and the outlet (2151) of the lubricating oil flow channel (215) is arranged on the outer circumferential wall of the positioning mandrel (214).

6. The pre-tightening clamp device according to claim 5, characterized in that, The outlet (2151) has a plurality of outlets (2151) which are arranged at intervals along the circumferential direction of the positioning mandrel (214); and / or, the outer side of the bearing inner ring (100) is further provided with a lubricating oil spraying device.

7. The pre-tightening clamp device according to claim 1, characterized in that, The rotating shaft (223) is a bolt, the screw rod of the bolt is threadedly connected with the first shaft section (211), and the swing shaft (222) is sleeved on the screw rod.

8. The pre-tightening clamp device according to claim 1, characterized in that, The end of the second shaft section (212) away from the first shaft section (211) has a threaded connecting piece (2111); and / or, the outer circumferential wall of the second shaft section (212) has a clamping groove (2112).

9. A bearing inner ring superfinishing machine characterized by, The bearing inner ring superfinishing machine pre-tightening clamp device comprises the bearing inner ring superfinishing machine pre-tightening clamp device according to any one of claims 1 to 8.

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