Bearing inner ring superfinishing machine workpiece clamp device, bearing inner ring superfinishing machine

Abstract

The application provides a bearing inner ring superfinishing machine workpiece clamp device and a bearing inner ring superfinishing machine, and belongs to the technical field of bearing superfinishing. The workpiece clamp device comprises 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 and a swing shaft, the shaft diameter of the swing shaft gradually increases from the end position to the middle position along the axial direction, the two loading bearings are respectively arranged at the two ends of the swing shaft, the positioning shaft is provided with an assembly hole penetrating along the radial direction, the assembly hole is a cylindrical hole, and the middle position of the swing shaft is provided with a rotating shaft. 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. The application improves the loading uniformity of the rolling support loading assembly on the bearing inner ring, prevents the occurrence of the loosening phenomenon of the bearing inner ring due to the limited adjustment ability of the uneven loading in the superfinishing process, and improves the superfinishing quality of the bearing inner ring.

Description

TECHNICAL FIELD

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

[0002] In order to improve the contact quality between the bearing inner ring groove (specifically, the inner ring of an angular contact ball bearing) and the rolling element, the contact surface roughness should be small 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 superfinishing. The bearing inner ring is subjected to superfinishing by using a bearing inner ring superfinishing auxiliary clamp during the superfinishing process. The bearing superfinishing auxiliary clamp has a centering shaft for bearing sleeving. The centering shaft is connected to 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. The machining reference surface is centered and connected to the chuck and rotates with the chuck. The other side of the bearing inner ring is connected to a constant-pressure assembly. The constant-pressure assembly 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.

[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. 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 line contact to point contact during the loading process. The load at the contact position increases. This causes the bearing inner ring to easily loosen 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 present application is proposed. SUMMARY

[0004] Therefore, the present application provides a bearing inner ring superfinishing machine workpiece clamp device and a bearing inner ring superfinishing machine, which can solve the technical problem of the prior art that the adjustment ability of the constant-pressure assembly in the bearing inner ring superfinishing machine workpiece clamp device 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 line contact to point contact during the loading process. The load at the contact position increases. This causes the bearing inner ring to easily loosen during superfinishing, thereby reducing the superfinishing quality (precision) of the bearing inner ring.

[0005] In order to solve the above problems, the application provides a bearing inner ring superfinishing machine workpiece clamp device, which comprises a centering and clamping assembly and a rolling support loading assembly, the centering and clamping assembly can be driven to rotate and can center and clamp a first end of a 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 an end face of a second end of the bearing inner ring through the two loading bearings, the rolling bearing assembly further comprises an oscillating shaft, the shaft diameter of the oscillating shaft gradually increases from an end position to a middle position along the axial direction, the two loading bearings are respectively arranged at the two ends of the oscillating shaft, an assembly hole penetrating in the radial direction is formed in the positioning shaft, the assembly hole is a cylindrical hole, the middle position of the oscillating shaft has a rotating shaft, and the oscillating shaft can be driven to oscillate around the rotating shaft when the bearing inner ring is unevenly loaded during the superfinishing process of the bearing inner ring.

[0006] In some embodiments, the rotating shaft is a bolt, the shank of the bolt is threadedly connected with the positioning shaft, and the oscillating shaft is sleeved on the shank.

[0007] In some embodiments, the bolt has a head, a tail section close to the head, and a head section away from the head, the oscillating shaft is sleeved on the shank between the tail section and the head section, and the tail section and the head section are threadedly connected with the positioning shaft.

[0008] In some embodiments, the end of the positioning shaft away from the centering and clamping assembly has a threaded connector, and / or the outer circumferential wall of the positioning shaft has a clamping groove.

[0009] In some embodiments, the end of the positioning shaft towards the centering and clamping assembly has a positioning mandrel, the positioning mandrel is inserted into a center through hole of the bearing inner ring, and the positioning mandrel and the center through hole have an assembly gap therebetween.

[0010] In some embodiments, a lubricating oil flow channel is formed in the positioning shaft, and the outlet of the lubricating oil flow channel is formed on the outer circumferential wall of the positioning mandrel.

[0011] In some embodiments, the outlet has a plurality of outlets, and the plurality of outlets are arranged at intervals in the circumferential direction of the positioning mandrel.

[0012] In some embodiments, the outer side of the bearing inner ring is further provided with a lubricating oil spraying device.

[0013] The application further provides a bearing inner ring superfinishing machine comprising the above bearing inner ring superfinishing machine workpiece clamp device.

[0014] The bearing inner ring superfinishing machine workpiece clamp device provided by the application, the shaft diameter of the swing shaft becomes smaller and smaller from the middle position to the shaft end position, that is, the swing shaft forms an axis body spliced by two conical shaft sections, so that a gap is formed between the swing shaft and the assembly hole in the form of a cylindrical hole, the gap allows the swing shaft to swing around the rotation shaft at a certain deflection angle when the swing shaft is unevenly loaded during the bearing inner ring superfinishing process, and the loading uniformity of the rolling support loading assembly on the bearing inner ring is further improved, the loosening phenomenon caused by the limited adjustment ability of the bearing inner ring due to uneven loading during the superfinishing process is effectively prevented, and the superfinishing quality of the bearing inner ring is improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a front view structural schematic diagram of the bearing inner ring superfinishing machine workpiece clamp device of the embodiment of the application.

[0016] Figure 2 It is a component perspective view of Figure 1 .

[0017] Figure 3 It is a sectional view (partially) of Figure 2 .

[0018] Figure 4 It is a top view structural schematic diagram of Figure 1 .

[0019] Figure 5 It is a component perspective view of Figure 4 .

[0020] Figure 6 It is a structural schematic diagram of the rolling bearing assembly in Figure 1 .

[0021] The reference signs are as follows:

[0022] 1, centering and clamping assembly; 2, rolling support loading assembly; 21, positioning shaft; 2111, threaded connecting piece; 2112, clamping groove; 212, assembly hole; 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, rotation shaft; 224, screw; 225, gasket; 100, bearing inner ring; 200, oil stone. DETAILED DESCRIPTION

[0023] For reference Figures 1 to 6As shown, according to the embodiment of the present application, a bearing inner ring superfinishing machine workpiece 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 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, see Figure 1 As shown, an oil stone 200 is arranged adjacent to the bearing inner ring 100, which matches the raceway on the outer side wall 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 applies axial pressure (also referred to as axial compression force) to the bearing inner ring 100 under the action of an axial pressing 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 applies axial pressure to 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, achieving the axial pressing of the bearing inner ring 100 while minimizing the friction force, the rolling bearing assembly 22 further comprises an oscillating shaft 222, the shaft diameter of the oscillating shaft 222 increases from the end position to the middle position along the axial direction, the two loading bearings 221 are respectively arranged at the two ends of the oscillating shaft 222, the positioning shaft 21 is provided with an assembly hole 212 penetrating in the radial direction, the assembly hole 212 is a cylindrical hole, the middle position of the oscillating shaft 222 has a rotating shaft 223, during the superfinishing process of the bearing inner ring 100, the oscillating shaft 222 can be driven to oscillate around the rotating shaft 223 when the bearing inner ring 100 is unevenly loaded.

[0024] In this technical solution, the shaft diameter of the oscillating shaft 222 decreases from the middle position to the end position, that is, the oscillating shaft 222 forms an axis body spliced by two conical shaft segments, in this way, a gap is formed between the oscillating shaft 222 and the assembly hole 212 which is a cylindrical hole, this gap allows the oscillating shaft 222 to oscillate around the rotating shaft 223 at 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, effectively preventing the loosening phenomenon of the bearing inner ring due to the limited adjustment ability of uneven loading during the superfinishing process, and improving the superfinishing quality of the bearing inner ring.

[0025] Specifically, see Figure 5 and Figure 6As shown, each loading bearing 221 is sleeved on a screw 224, 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 shank of the screw 224 is sleeved with a washer 225, the screw head of the screw 224 and the washer 225 together form a clamping for the inner ring of the loading bearing 221 with the shaft end of the swing shaft 222, and the outer ring of the loading bearing 221 is in rolling contact with the second end face of the bearing inner ring 100.

[0026] Specifically, the rotating shaft 223 can be implemented by a bolt, the shank of the bolt is threadedly connected with the positioning shaft 21 and the swing shaft 222 is sleeved on the shank, at this time the swing shaft 222 is not meshed with the shank but is sleeved for smooth swing, the thread connection between the shank and the positioning shaft 21 realizes reliable positioning of the swing shaft 222 in the axial and radial directions, and the structure is simple. In a more preferred embodiment, the bolt has a screw head, a section of the bolt close to the screw head is a tail section, and a section of the bolt away from the screw head is a head section, the swing shaft 222 is sleeved on the shank between the tail section and the head section, and the tail section and the head section are threadedly connected with the positioning shaft 21, so that the structure realizes support of both ends of the rotating shaft 223 instead of cantilever support, which can improve the positioning structure strength of the shank to the swing shaft 222.

[0027] In some embodiments, the end of the positioning shaft 21 away from the centering and clamping assembly 1 has a threaded connecting piece 2111, the positioning shaft 21 is detachably connected with the axial pressure maintaining device through the threaded connecting piece 2111, which is convenient to disassemble and assemble; in order to reliably limit the circumferential displacement of the positioning shaft 21, the outer circumferential wall of the positioning shaft 21 has a clamping groove 2112.

[0028] In some embodiments, the end of the positioning shaft 21 toward the centering and clamping assembly 1 has a positioning mandrel 214, the positioning mandrel 214 is inserted into the central through hole of the bearing inner ring 100, and the positioning mandrel 214 and the central through hole have an assembly gap, that is, the positioning mandrel 214 is inserted into the central 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.

[0029] Referring to Figure 2As shown, the positioning shaft 21 is internally provided with a lubricating oil flow channel 215, the outlet 2151 of the lubricating oil flow channel 215 is arranged on the outer circumferential wall of the positioning mandrel 214, the lubricating oil flow channel 215 has an inlet 2152 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, thereby realizing the lubrication between the central through hole of the bearing inner ring 100 and the positioning mandrel 214, and more importantly, the lubricating oil is introduced into the central through hole of the bearing inner ring 100 through the outlet 2151 in the technical solution, thereby effectively cooling the inner side of the bearing inner ring 100, and the heat generated between the oil stone 200 and the bearing inner ring 100 during the superfinishing process is more effectively removed, thereby improving the machining quality and precision. Of course, more preferably, a lubricating oil spraying device (not shown in the figure) is further arranged on the outer side of the bearing inner ring 100, the lubricating oil spraying device sprays and lubricates and cools the outer side of the bearing inner ring 100, and the lubricating oil flowing out of the outlet 2151 of the lubricating oil flow channel 215 realizes the lubrication and cooling of the bearing inner ring 100 from the inside and the outside, thereby effectively improving the quality of the superfinishing. In a specific embodiment, the outlet 2151 has a plurality of outlets 2151 arranged at intervals along the circumference of the positioning mandrel 214, as shown in the figure, three outlets 2151 are shown in the figure, one lubricating oil flow channel 215 is used to supply oil to the three outlets 2151 in three ways, thereby simplifying the structure and realizing the balanced cooling of the central through hole of the bearing inner ring 100, and the balanced cooling can ensure the uniformity of the temperature rise of the bearing inner ring 100 in the circumferential direction, thereby significantly improving the quality of the superfinishing. Figure 3 As shown, the outlet 2151 has a plurality of outlets 2151 arranged at intervals along the circumference of the positioning mandrel 214, as shown in the figure, three outlets 2151 are shown in the figure, one lubricating oil flow channel 215 is used to supply oil to the three outlets 2151 in three ways, thereby simplifying the structure and realizing the balanced cooling of the central through hole of the bearing inner ring 100, and the balanced cooling can ensure the uniformity of the temperature rise of the bearing inner ring 100 in the circumferential direction, thereby significantly improving the quality of the superfinishing.

[0030] According to the embodiments of the present application, a bearing inner ring superfinishing machine workpiece clamp device is also provided.

[0031] Those skilled in the art can easily understand that the advantageous technical features of the above-mentioned modes can be freely combined and superimposed without conflict.

[0032] 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 it should be pointed out that those skilled in the art can make several improvements and modifications without departing from the technical principles of the present application, and these improvements and modifications shall be regarded as the protection scope of the present application.

Claims

1. A bearing inner ring superfinishing workpiece 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 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, the two loading bearings (221) are respectively arranged at the two ends of the swing shaft (222), the positioning shaft (21) is provided with an assembly hole (212) penetrating through the radial direction, the assembly hole (212) is a cylindrical hole, the middle position of the swing shaft (222) is provided with 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 to prevent the contact between the loading bearing (221) and the end face of the bearing inner ring (100) during loading from line contact to point contact, which causes the load at the contact to increase, so that the bearing inner ring (100) is loose during the superfinishing process; the rotating shaft (223) is a bolt, the shank of the bolt is threadedly connected with the positioning shaft (21), and the swing shaft (222) is sleeved on the shank, the swing shaft (222) and the shank are not engaged, but are only sleeved to realize the smoothness of the swing of the swing shaft (222).

2. The workpiece clamp apparatus of claim 1, wherein, The bolt has a head, a tail section close to the head of the bolt, and a head section away from the head of the bolt, the swing shaft (222) is sleeved on the shank between the tail section and the head section, and the tail section and the head section are threadedly connected with the positioning shaft (21).

3. The workpiece clamp apparatus of claim 1, wherein, The end of the positioning shaft (21) away from the center clamping assembly (1) is provided with a threaded connecting piece (2111); and / or, the outer circumferential wall of the positioning shaft (21) is provided with a clamping groove (2112).

4. The workpiece clamp apparatus of claim 1, wherein, The end of the positioning shaft (21) towards the center clamping assembly (1) is provided with 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 workpiece clamp apparatus of claim 4, wherein, The positioning shaft (21) is internally 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 workpiece clamp apparatus of claim 5, wherein, The outlet (2151) has a plurality of outlets (2151) arranged at intervals along the circumference of the positioning mandrel (214).

7. The workpiece clamp apparatus of claim 5, wherein, The outer side of the bearing inner ring (100) is further provided with a lubricating oil spraying device.

8. A bearing inner ring superfinishing machine characterized by, The bearing inner ring superfinishing machine workpiece clamp device of any one of claims 1 to 7.

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