CN210024884U - A super-finishing positioning mandrel device for the inner ring of a railway bearing - Google Patents

Abstract

The utility model introduces a positioning mandrel device for super-finishing machining of the inner ring of a railway bearing, which comprises: a mandrel, a positioning sleeve, a bearing, an elastic retaining ring, a nut and a washer; the mandrel is a stepped cylindrical mandrel, and the small Two rows of high-precision angular contact ball bearings are arranged at the ends; the positioning sleeve is an annular sleeve with steps, the inner hole is a two-stage stepped hole, the inner hole in the middle is installed on the outer diameter of the bearing, and the end port of the bearing is provided with a retaining ring groove The elastic retaining ring is installed in the retaining ring groove of the positioning sleeve; the gasket is pressed on the end face of the inner ring of the bearing through the nut, and the workpiece is installed on the positioning sleeve. The device is installed on the ultra-finishing machine tool. When the workpiece rotates, the positioning sleeve and the workpiece rotate synchronously, and there is no relative rotation between the workpiece and the mandrel, and the inner diameter of the workpiece will no longer be scratched and worn. The device is designed It is scientific and simple in structure, and has a good protective effect on the inner diameter of the workpiece, which improves the processing quality of the workpiece and further improves the service life of the workpiece.

Description

A super-finishing positioning mandrel device for the inner ring of a railway bearing

technical field

The utility model belongs to the technical field of processing of railway bearings, in particular to a positioning mandrel device for super-finishing machining of an inner ring of a railway vehicle bearing.

Background technique

At present, in the grinding process of super-finishing of the inner ring of railway bearings, the super-finishing of the outer diameter of the inner ring is all positioned and supported by the inner diameter mandrel, and the positioning and supporting mandrel is fixed and does not rotate. The high-pressure oil sprayed from the shaft floats the workpiece. During the rotation of the workpiece, the gap between the workpiece and the mandrel changes due to the change of the pressure oil. The inner diameter of the inner ring of the bearing is scratched and worn, which affects the processing quality of the product.

Utility model content

The purpose of this utility model is to propose a positioning mandrel device for super-finishing machining of the inner ring of a railway bearing. The device utilizes a pair of high-precision bearings to be mounted on the positioning mandrel. The original fixed mandrel is changed to a rotatable positioning sleeve, so that the positioning sleeve and the workpiece rotate synchronously, the workpiece and the mandrel do not rotate relative to each other, and the inner diameter of the workpiece is no longer scratched.

The purpose of the utility model can be achieved by the following technical solutions: a super-finishing positioning mandrel device for the inner ring of a railway bearing, comprising: a mandrel, a positioning sleeve, a bearing, an elastic retaining ring, a nut and a gasket, the core The shaft is a stepped cylindrical mandrel, the small end of the step is provided with two rows of bearings, and the end is provided with a thread; the positioning sleeve is an annular sleeve with steps, the inner hole is a two-stage stepped hole, and the inner hole in the middle is installed on the outer diameter of the bearing. , a retaining ring groove is set at one end port of the bearing; the elastic retaining ring is installed in the retaining ring groove of the positioning sleeve; the gasket is sleeved on the threaded end of the mandrel, and is pressed against the end face of the bearing inner ring by a nut superior.

For the mandrel, the outer diameter of the small end of the step and the inner diameter of the inner ring of the bearing are matched with high precision.

The aperture size of the small stepped end of the positioning sleeve is larger than the outer diameter of the large stepped end of the mandrel, and the length and aperture size of the stepped hole in the middle of the positioning sleeve match the axial size and outer diameter of the two bearings, and match the outer diameter of the bearing. Diameter with high precision.

The outer diameter of the large end of the positioning sleeve is matched with the inner diameter of the workpiece with high precision.

The outer diameter of the gasket corresponds to the outer diameter of the inner ring of the bearing.

The bearing adopts high precision angular contact ball bearing.

When the utility model is used, two rows of bearings are firstly installed on the small stepped end of the mandrel, then the positioning sleeve is sleeved on the bearing, the bearing is positioned with an elastic retaining ring, a gasket is installed, tightened with a nut, and finally the workpiece is installed on the Positioning sleeve. When the device is installed on the ultra-fine grinding machine, when the workpiece rotates, the positioning sleeve and the workpiece rotate synchronously, and there is no relative rotation between the workpiece and the mandrel, and the inner diameter of the workpiece is no longer scratched and worn.

The beneficial effects of the utility model are as follows: the device is scientifically designed, simple in structure, light in use, has a good protective effect on the inner diameter of the workpiece, improves the processing quality of the workpiece, and further increases the service life of the workpiece.

Description of drawings

Fig. 1 is the front view of the utility model;

Fig. 2 is the front view of the mandrel of the utility model;

Fig. 3 is the front view of the positioning sleeve of the utility model;

Marked in the figure: 1. Mandrel, 2. Positioning sleeve, 3. Bearing, 4. Retaining ring, 5. Nut, 6. Washer, 7. Workpiece.

Detailed ways

The specific embodiments of the present utility model will be further described in detail below with reference to the accompanying drawings.

As shown in Figures 1, 2 and 3, a super-finishing positioning mandrel device for the inner ring of a railway bearing includes: a mandrel 1, a positioning sleeve 2, a bearing 3, a retaining ring 4, a nut 5 and a washer 6 The mandrel 1 is a stepped cylindrical mandrel, and the small end of the step is provided with two rows of bearings 3, the outer diameter of the small end is matched with the inner diameter of the inner ring of the bearing 3 with high precision, and the end is provided with a thread, and the thread of the nut 5 Correspondingly; the positioning sleeve 2 is an annular sleeve with steps, the inner hole is two-stage stepped holes, and the aperture size of the small end of the step is slightly larger than the outer diameter of the large end of the mandrel 1 to ensure that the large end of the mandrel 1 and the positioning sleeve 2 No contact, the stepped hole in the middle of the positioning sleeve 2 is installed on the outer diameter of the bearing 3. The length and diameter of the stepped hole match the axial size and outer diameter of the two bearings 3, and are matched with the bearing 3 with high precision. One end port of the bearing 3 is provided with a retaining ring groove, and the position of the retaining ring groove in the positioning sleeve 2 just meets the axial dimension of the two bearings 3; The workpiece 7 is fixed on the positioning sleeve 2; the elastic retaining ring 4 is installed in the retaining ring groove of the positioning sleeve 2, and plays a role in positioning the bearing 3; the gasket 6 is sleeved on the threaded end of the mandrel 1 , the outer diameter of the gasket 6 corresponds to the outer diameter of the inner ring of the bearing 3, and it just stops on the inner ring of the bearing 3, and is pressed against the end face of the inner ring by the nut 5; the bearing 3 is made of high-precision The angular contact ball bearing ensures the high rotation precision of the mandrel 1 and guarantees the processing quality of the product.

The technological process of the present utility model is as follows: firstly, two rows of high-precision bearings 3 are installed on the stepped small end of the mandrel 1, and then the positioning sleeve 2 is placed on the outer diameter of the bearing 3 through the large end of the mandrel 1, and elastic Place the retaining ring 4 into the retaining ring groove of the positioning sleeve 2, position the bearing 3, then install the gasket 6, tighten it with the nut 5, press the gasket 6 on the end face of the inner ring of the bearing 3, and finally install the workpiece 7 on the locating sleeve 2. The device is installed on the superfinishing machine tool, when the workpiece 7 rotates, the positioning sleeve 2 and the workpiece 7 rotate synchronously, and there is no relative rotation between the workpiece 7 and the mandrel 1, and the inner diameter of the workpiece 7 is no longer scratched , wear, has a good protective effect on the inner diameter of the workpiece 7, improves the processing quality of the workpiece 7, and further improves the service life of the railway bearing.

Claims (6)

1. A railway bearing inner race superfinishing positioning mandrel device comprises: dabber, position sleeve, bearing, circlip, nut and gasket, characterized by: the mandrel is a stepped cylindrical mandrel, two rows of bearings are arranged at the small end of the step, and a section of thread is arranged at the end head; the positioning sleeve is an annular sleeve with steps, an inner hole is two sections of stepped holes, the inner hole in the middle is arranged on the outer diameter of the bearing, and a retainer ring groove is arranged at one end port for mounting the bearing; the elastic retainer ring is arranged in a retainer ring groove of the positioning sleeve; the gasket is sleeved at one end of the mandrel with threads and is pressed on the end surface of the bearing inner ring through a nut.

2. The railway bearing inner ring superfinishing positioning mandrel device according to claim 1, wherein: the outer diameter of the small stepped end of the mandrel is matched with the inner diameter of the bearing inner ring in a high-precision mode.

3. The railway bearing inner ring superfinishing positioning mandrel device according to claim 1, wherein: the diameter of the small end of the step of the positioning sleeve is larger than the outer diameter of the large end of the step of the mandrel, and the length and the diameter of the step hole in the middle of the positioning sleeve are matched with the axial size and the outer diameter of the two bearings and are matched with the outer diameters of the bearings in a high-precision mode.

4. The railway bearing inner ring superfinishing positioning mandrel device according to claim 1, wherein: the outer diameter of the large end of the positioning sleeve is matched with the inner diameter of the workpiece with high precision.

5. The railway bearing inner ring superfinishing positioning mandrel device according to claim 1, wherein: the outer diameter of the gasket is corresponding to that of the bearing inner ring.

6. The railway bearing inner ring superfinishing positioning mandrel device according to claim 1, wherein: the bearing adopts a high-precision angular contact ball bearing.

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