Double-rotation inner support device for superfinishing of high-precision bearing inner ring

Abstract

The utility model relates to the field of bearing processing, in particular to a double-rotation inner support device for superfinishing a high-precision bearing inner ring, which is used for supporting the bearing inner ring and comprises a support shaft, a step is arranged at the front end of the support shaft, and a first inner support component and a second inner support component are detachably mounted at the front end of the support shaft through locking components. The inner supporting structure has the advantages that strain, scratches, black marks and the like caused by contact between the inner supporting structure and the inner surface of the bearing inner ring are effectively avoided, a pressing wheel does not need to be used, and the inner supporting structure is simple in structure, convenient to use and high in practicability. Therefore, scratches generated when the pressing wheel presses the end face of the bearing inner ring are effectively avoided, and the appearance of the bearing inner ring is improved. And errors caused by friction can be reduced, the machining precision of the bearing inner ring is improved, and the situation that when the bearing inner ring is machined, the outer circle face of the pressing wheel is abraded too early, and consequently the precision of a workpiece is affected is avoided.

Description

Technical Field

[0001] This utility model relates to the field of bearing processing, specifically to a double-rotating inner support device for ultra-precision inner rings of high-precision bearings. Background Technology

[0002] During ultra-precision machining of bearings, the workpiece clamping methods include: mechanical clamping centerless clamping, double roller clamping, and hydraulic centering clamping. Mechanical clamping centerless clamping, where the ultra-precision groove is positioned by the outer diameter, means its machining accuracy is affected by the geometric error of the outer diameter. The workpiece rotation speed is limited and cannot be too high, otherwise it may cause burns on the end face or outer cylindrical surface. The original parallelism difference between the groove and the reference end face cannot be too large, otherwise the machining quality will be unstable. Because the support rests on the outer diameter or groove of the product, support marks or scratches on the contact surface are easily produced. Double roller clamping, without an end face positioning device, relies solely on the friction of the outer cylindrical surface for power transmission, which is prone to damage. The slippage and axial movement make it difficult to guarantee the positional accuracy of the groove. The inner sleeve hydraulic centering clamping, because the inner centering shaft is fixed and does not rotate with the workpiece, factors such as the hydraulic oil filtration system and the stability of the hydraulic components can affect the normal operation of ultra-precision machining. This can cause the centering shaft to scratch the inner surface of the workpiece and produce black marks. The pressure balance is lost during support, which also destroys the original geometry of the groove hole. Since the mechanism uses rollers to press the end face of the workpiece during operation, the wear of the pressure rollers can easily cause deep marks on the end face of the workpiece. In addition, when ultra-grinding thin-walled workpieces, the end face of the workpiece is narrow, which can easily cause the contact surface of the pressure roller to wear prematurely, affecting the workpiece accuracy.

[0003] Therefore, it is necessary to invent a high-precision bearing inner ring ultra-precision double rotating inner support device. Utility Model Content

[0004] Therefore, this utility model provides a high-precision bearing inner ring ultra-precision double rotating inner support device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a high-precision bearing inner ring ultra-precision double rotating inner support device for supporting the bearing inner ring, including a support shaft, a step provided at the front end of the support shaft, and a first inner support component and a second inner support component detachably installed at the front end of the support shaft through a locking component, the bearing inner ring abutting against the first inner support component and the second inner support component, and an oil injection component provided on the support shaft.

[0006] Preferably, the first inner support assembly includes an angular contact ball bearing, with the inner ring of the angular contact ball bearing sleeved on the front end of the support shaft, and the rear end of the angular contact ball bearing abutting against the front end of the step.

[0007] Preferably, the first inner support assembly further includes an annular centering seat, the rear side of the inner ring surface of the annular centering seat is fixed to the outer ring of the angular contact ball bearing, and the front end of the outer ring surface of the annular centering seat is provided with an arc-shaped groove.

[0008] Preferably, a spacer is also fitted at the front end of the support shaft, the rear end of the spacer abuts against the front end of the inner ring of the angular contact ball bearing, and a gap is left between the spacer and the inner ring surface of the annular centering seat.

[0009] Preferably, the second inner support assembly includes a deep groove ball bearing, wherein the inner ring of the deep groove ball bearing is fitted onto the front end of the support shaft, the rear end of the deep groove ball bearing abuts against the front end of the spacer ring, the inner ring of the bearing is fitted onto the outer ring of the deep groove ball bearing, and the rear end of the inner ring of the bearing abuts against the surface of the arc groove.

[0010] Preferably, the locking assembly includes a washer, a locking screw is threaded to the center of the washer, the locking screw is threaded to the center of the front end of the support shaft, and the rear end of the washer abuts against the front end of the deep groove ball bearing.

[0011] Preferably, the oil injection assembly includes a support shaft oil inlet, which is located inside the support shaft. The front end of the support shaft has a support shaft oil outlet, which is connected to the support shaft oil inlet. The spacer ring has a spacer ring oil outlet, which is connected to the support shaft oil outlet.

[0012] The beneficial effects of this utility model are as follows: By using the support shaft, step, locking assembly, first inner support assembly, second inner support assembly, and oil injection assembly in combination, a double-rotating inner support structure is adopted, which effectively avoids scratches, marks, and black marks caused by the contact between the inner support structure and the inner surface of the bearing inner ring. It also eliminates the need for a clamping wheel, thus effectively preventing scratches caused by the clamping wheel pressing against the bearing inner ring end face and improving the appearance of the bearing inner ring. Furthermore, it reduces errors caused by friction, improves the machining accuracy of the bearing inner ring, and prevents premature wear of the clamping wheel's outer surface during bearing inner ring machining, which would affect workpiece accuracy. The optimized inner support structure makes adjustment convenient, avoids frequent replacement of the clamping wheel, and the coordinated work of multiple components ensures the stability of the inner support, which is beneficial for improving production efficiency. It is suitable for equipment with different positioning dimensions and can be widely applied to other bearings, such as angular contact ball bearings and thin-walled ball bearings. Attached Figure Description

[0013] Figure 1 This is a side view of the structure provided by this utility model;

[0014] Figure 2 The structural front view provided for this utility model;

[0015] Figure 3A schematic diagram of the structure of the support shaft provided by this utility model;

[0016] Figure 4 A schematic diagram of the structure of the annular positioning seat provided by this utility model;

[0017] Figure 5 A schematic diagram of the spacer structure provided by this utility model;

[0018] Figure 6 The diagram shows the effect of using this utility model.

[0019] In the diagram: 1. Inner ring of bearing; 2. Support shaft; 3. Step; 4. Angular contact ball bearing; 5. Annular centering seat; 6. Arc groove; 7. Spacer; 8. Deep groove ball bearing; 9. Shim; 10. Locking screw; 11. Oil inlet of support shaft; 12. Oil outlet of support shaft; 13. Oil outlet of spacer; 14. Oilstone. Detailed Implementation

[0020] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0021] Please refer to the appendix. Figures 1-6 The high-precision bearing inner ring ultra-precision double rotating inner support device provided by this utility model is used to support the bearing inner ring 1. It includes a support shaft 2, a step 3 is provided at the front end of the support shaft 2, and a first inner support component and a second inner support component are detachably installed at the front end of the support shaft 3 through a locking component. The bearing inner ring 1 abuts against the first inner support component and the second inner support component. An oil injection component is provided on the support shaft 2.

[0022] The first inner support assembly includes an angular contact ball bearing 4. The inner ring of the angular contact ball bearing 4 is fitted onto the front end of the support shaft 2, and the rear end of the angular contact ball bearing 4 abuts against the front end of the step 3. The first inner support assembly also includes an annular centering seat 5. The rear side of the inner ring surface of the annular centering seat 5 is fixed to the outer ring of the angular contact ball bearing 4, so that the annular centering seat 5 can rotate synchronously with the inner ring 1 of the bearing and bear the axial thrust. The front end of the outer ring surface of the annular centering seat 5 is provided with an arc groove 6. The front end of the support shaft 2 is also fitted with a spacer 7. The rear end of the spacer 7 abuts against the front end of the inner ring of the angular contact ball bearing 4, and a gap is left between the spacer 7 and the inner ring surface of the annular centering seat 5.

[0023] The second inner support assembly includes a deep groove ball bearing 8. The inner ring of the deep groove ball bearing 8 is fitted onto the front end of the support shaft 2, and the rear end of the deep groove ball bearing 8 abuts against the front end of the spacer 7. The inner ring 1 of the bearing is fitted onto the outer ring of the deep groove ball bearing 8, and the rear end of the inner ring 1 abuts against the surface of the arc groove 6. Specifically, under the action of the spacer 7, the gap between the deep groove ball bearing 8 and the angular contact ball bearing 4 is eliminated, improving the locking effect. Under the action of the arc groove 6, the front end of the annular centering seat 5 forms a conical surface, which, together with the inner support of the deep groove ball bearing 8, can axially center the inner ring 1 of the bearing. The outer diameter of the deep groove ball bearing 8 supports the inner hole of the inner ring 1 of the bearing, which plays the role of centering and supporting the inner ring 1 of the bearing, bearing the radial force generated during ultra-precision and rotating synchronously with the inner ring 1 of the bearing.

[0024] The locking assembly includes a washer 9, with a locking screw 10 threaded to the center of the washer 9. The locking screw 10 is threaded to the center of the front end of the support shaft 2, and the rear end of the washer 9 abuts against the front end of the deep groove ball bearing 8. Specifically, under the locking action of the locking screw 10, the deep groove ball bearing 8, the spacer 7, and the angular contact ball bearing 4 can be locked together at the front end of the support shaft 2 by the washer 9.

[0025] The oiling assembly includes a support shaft oil inlet 11, which is located inside the support shaft 2. The support shaft 2 has an oil outlet 12 at its front end, which is connected to the support shaft oil inlet 11. The spacer 7 has a spacer oil outlet 13, which is connected to the support shaft oil outlet 12. Specifically, the superfine oil enters the gap between the spacer 7 and the inner ring surface of the annular centering seat 5 through the support shaft oil outlet 12 and the spacer oil outlet 13, and then enters the deep groove ball bearing 8, the angular contact ball bearing 4, and the inner ring 1 of the bearing to lubricate and cool the components.

[0026] In summary, this device changes the internal support structure from a fixed type to a rotating type, allowing the bearing inner ring 1 to rotate synchronously with the internal support structure. This eliminates relative movement between the inner diameter of the bearing inner ring 1 and the internal support structure, preventing scratches, black marks, and scoring caused by friction. Furthermore, the end face of the bearing inner ring 1 is changed from a pressure wheel to a conical surface formed at the front end of the annular centering seat 5, which presses against the bearing inner ring 1 and rotates with it. This avoids deep marks on the end face of the bearing inner ring 1 caused by wear of the pressure wheel, thus preventing impact on product precision. Moreover, the bearing inner ring 1 is secured by an oilstone 14 (such as...). Figure 6As shown, during ultra-precision milling, the outer ring of the deep groove ball bearing 8 is inserted into the inner hole of the bearing inner ring 1, providing centering and support for the bearing inner ring 1. It withstands the radial force generated during ultra-precision milling and rotates synchronously with the bearing inner ring 1, eliminating relative movement between the inner diameter of the bearing inner ring 1 and the inner support structure. This improves the appearance quality and machining accuracy of the bearing inner ring 1, optimizes the inner support structure, facilitates adjustment, avoids frequent replacement of the clamping wheel, and ensures the stability of the inner support by the coordinated work of multiple components, which is beneficial to improving production efficiency. Furthermore, the rear end of the support shaft 2 is equipped with mounting positions of different sizes (not marked in the figure), thus adapting to equipment with different positioning dimensions. For example, it can be used with 3MZ316D and 3MZ3110 equipment, and can also be used with other bearings, such as angular contact ball bearings and thin-walled ball bearings, making it widely applicable.

[0027] The above description is merely a preferred embodiment of this utility model. Any person skilled in the art can modify this utility model or modify it into an equivalent technical solution using the technical solution described above. Therefore, any simple modifications or equivalent substitutions made based on the technical solution of this utility model are within the scope of protection claimed by this utility model.

Claims

1. A double-rotation inner support device for high-precision bearing inner ring superfinishing, used for supporting a bearing inner ring (1), comprising a support shaft (2), wherein a step (3) is arranged at the front end of the support shaft (2), and characterized in that: The front end of the support shaft (2) is detachably provided with a first inner support assembly and a second inner support assembly through a locking assembly, the bearing inner ring (1) abuts on the first inner support assembly and the second inner support assembly, and the support shaft (2) is provided with an oil injection assembly. ​ 2. The double-rotation inner support device for superfinishing the inner ring of a high-precision bearing according to claim 1, characterized in that: The first inner support assembly comprises an angular contact ball bearing (4), the inner ring of the angular contact ball bearing (4) is sleeved on the front end of the support shaft (2), and the rear end of the angular contact ball bearing (4) abuts on the front end of the step (3).

3. The double-rotation inner support device for superfinishing the inner ring of a high-precision bearing according to claim 2, characterized in that: The first inner support assembly further comprises an annular centering seat (5), the inner ring surface of the annular centering seat (5) is fixed to the outer ring of the angular contact ball bearing (4) at the rear side, and the front end of the outer ring surface of the annular centering seat (5) is provided with an arc-shaped groove (6).

4. The double-rotation inner support device for superfinishing the inner ring of a high-precision bearing according to claim 3, characterized in that: The front end of the support shaft (2) is further sleeved with a spacer ring (7), the rear end of the spacer ring (7) abuts on the front end of the inner ring of the angular contact ball bearing (4), and a gap is left between the spacer ring (7) and the inner ring surface of the annular centering seat (5).

5. The double-rotation inner support device for superfinishing the inner ring of a high-precision bearing according to claim 4, characterized in that: The second inner support assembly comprises a deep groove ball bearing (8), the inner ring of the deep groove ball bearing (8) is sleeved on the front end of the support shaft (2), the rear end of the deep groove ball bearing (8) abuts on the front end of the spacer ring (7), the bearing inner ring (1) is sleeved on the outer ring of the deep groove ball bearing (8), and the rear end of the bearing inner ring (1) abuts on the surface of the arc-shaped groove (6).

6. The double-rotation inner support device for superfinishing the inner ring of a high-precision bearing according to claim 5, characterized in that: The locking assembly comprises a gasket (9), the center of the gasket (9) is threadedly connected with a locking screw (10), the locking screw (10) is threadedly connected with the center of the front end of the support shaft (2), and the rear end of the gasket (9) abuts on the front end of the deep groove ball bearing (8).

7. The double rotary inner support device for superfinishing the inner ring of a high-precision bearing according to claim 4, characterized in that: The oil injection assembly comprises a support shaft oil inlet (11) which is arranged in the support shaft (2), the front end of the support shaft (2) is provided with a support shaft oil outlet (12), the support shaft oil outlet (12) is in communication with the support shaft oil inlet (11), the spacer ring (7) is provided with a spacer ring oil outlet (13), and the spacer ring oil outlet (13) is in communication with the support shaft oil outlet (12) in correspondence.

Images