ANTIGRAVITY SHEAR-RESISTING AND DEFORMATION-ELIMINATING CENTERLESS GRINDING APPARATUS AND MACHINING METHOD

Abstract

Disclosed are an antigravity shear-resisting and deformation-eliminating centerless grinding apparatus and a machining method. The grinding apparatus comprises a grinding tool configured to grind a thin-walled bearing ring and a clamping mechanism configured to clamp the thin-walled bearing ring stably. The clamping mechanism comprises a main clamping mechanism and an auxiliary clamping mechanism. The main clamping mechanism comprises an electromagnetic centerless clamp. The electromagnetic coil is arranged above the thin-walled bearing ring being ground. According to the present invention, not only can gravity of the thin-walled bearing ring and a tangential force generated by grinding be counteracted to effectively prevent extrusion deformation of the thin-walled bearing ring when being ground, but also the lubricating performance the capacity to resist load itself can be further improved and the service life of is prolonged.

Description

TECHNICAL FIELD

The present invention relates to a grinding apparatus and a machining method, in particular to an antigravity shear-resisting and deformation-eliminating centerless grinding apparatus and a machining method.

BACKGROUND

Grinding refers to a machining method of excising excessive materials on a workpiece by means of a grinding material and a grinding tool. According to different process objectives and requirements, there are various forms of grinding process methods. In order to fit a developmental need, a grinding technique develops towards a direction of precision, low roughness, efficiency, high speed and automatic grinding.

There are many grinding forms. A usual primary grinding form is grinding wheel grinding. In the grinding process, as a part is of certain gravity (for example, a thin-walled bearing ring), a pressure is generated to an electromagnetic centerless clamp, and when there is extrusion, there will be deformation. During grinding, a tangential force will be generated, and thus, a lot of relatively regularly arranged cracks-grinding cracks usually appear on a surface substantially perpendicular to a grinding direction. They not only affect the appearance of the part, but also more importantly affect the precision and quality of the part directly, so that the integral operating safety and the service life of a major device are affected. How to solve phenomena of deformation, cracks and etc. caused by gravity and tangential force in the grinding becomes a problem demanding prompt solution in the whole industry.

SUMMARY

It is thereof an objective to overcome the problem and provide an antigravity shear-resisting and deformation-eliminating centerless grinding apparatus. According to the grinding apparatus not only can gravity of the thin-walled bearing ring and a tangential force generated by grinding be counteracted to effectively prevent extrusion deformation of the thin-walled bearing ring when being ground, but also the lubricating performance the capacity to resist load itself can be further improved and the service life of is prolonged.

It is thereof another objective to provide an antigravity shear-resisting and deformation-eliminating centerless grinding machining method.

The objective of the present invention is realized by the technical schemes as follows:

An antigravity shear-resisting and deformation-eliminating centerless grinding apparatus includes a grinding tool configured to grind a thin-walled bearing ring and a clamping mechanism configured to clamp the thin-walled bearing ring stably, wherein the clamping mechanism includes a main clamping mechanism and an auxiliary clamping mechanism; the main clamping mechanism includes an electromagnetic centerless clamp and the auxiliary clamping mechanism includes an electromagnetic coil and a center buffer clamp; the center buffer clamp is arranged on an inner side of the thin-walled bearing ring being ground; and the electromagnetic coil is arranged above the thin-walled bearing ring being ground.

A working principle of the antigravity shear-resisting and deformation-eliminating centerless grinding apparatus is as follows:

during work, as a thickness of the thin-walled bearing ring is relatively small and the thin-walled bearing ring is of certain gravity with the addition of the tangential force generated during grinding, the thin-walled bearing ring has deformation invisible to the naked eye. It is found by verification of an experiment that the ground thin-walled bearing ring becomes elliptical and even the surface generates cracks. After gravity of the thin-walled bearing rings of different types is determined, the magnetic force to the thin-walled bearing ring is changed by adjusting a number of turns, a current and a voltage of the electromagnetic coil, such that the gravity is just counteracted and extrusion deformation is prevented. The inner side of the center buffer clamp is provided with a groove and a reinforcing rib. During machining, through the buffer layer, the tangential force generated in the grinding process can be counteracted, friction of the thin-walled bearing ring is reduced, the tangential force is high-temperature-resistant and dissipates heat quickly, and high-temperature, extrusion deformation and etc. of the thin-walled bearing ring are prevented.

In a preferred scheme of the present invention, the center buffer clamp is of an annular structure, and an inner side surface thereof is provided with a plurality of buffer grooves; and a buffer reinforcing rib is formed between the adjacent two buffer grooves. Through the structure, during machining, through the buffer layer, the tangential force generated in the grinding process can be counteracted, friction of the thin-walled bearing ring is reduced, the tangential force is high-temperature-resistant and dissipates heat quickly, and high-temperature, extrusion deformation and etc. of the thin-walled bearing ring are prevented.

In a preferred scheme of the present invention, the main clamping mechanism further includes a supporting plate, the supporting plate includes a first supporting plate and a second supporting plate, and the first supporting plate and the second supporting plate are symmetrically arranged below the thin-walled bearing ring being ground.

An antigravity shear-resisting and deformation-eliminating centerless grinding machining method, including the following steps:

(1) carrying out a preliminary experiment according to a model of a to-be-machined thin-walled bearing ring to determine gravity thereof;

(2) adjusting a parameter of an electromagnetic coil according to the gravity of the thin-walled bearing ring, such that a magnetic force generated by the electromagnetic coil is counteracted with the gravity of the thin-walled bearing ring acting on the electromagnetic centerless clamp;

(3) mounting the thin-walled bearing ring on the electromagnetic centerless clamp and mounting the center buffer clamp on an inner side of the thin-walled bearing ring;

(4) starting a grinding tool, wherein the grinding tool machines an outer surface of the thin-walled bearing ring rotatably, and the center buffer clamp counteracts a tangential force from extrusion of the grinding tool on the inner side of the thin-walled bearing ring while grinding; and

(5) after grinding is completed, taking the thin-walled bearing ring down for subsequent machining.

In a preferred scheme of the present invention, in the step (2), after the gravity of the thin-walled bearing rings of different types is determined, the magnetic force to the thin-walled bearing ring is changed by adjusting a number of turns, a current and a voltage of the electromagnetic coil, such that the gravity is just counteracted and extrusion deformation is prevented.

In a preferred scheme of the present invention, in the step (3), the electromagnetic coil is uniformly arranged and mounted in a middle of the electromagnetic centerless clamp, and the position and the number of turns thereof can be adjusted and the electromagnetic coil is located in a position right above the thin-walled bearing ring.

Compared with the prior art, the present invention has the following beneficial effects:

1. In the present invention, after gravity of the thin-walled bearing rings of different types is determined, the magnetic force to the thin-walled bearing ring is changed by adjusting a number of turns, a current and a voltage of the electromagnetic coil, such that the gravity is just counteracted and extrusion deformation is prevented.

2. By arranging the center buffer clamp, the inner side of the center buffer clamp is provided with a groove and a reinforcing rib. During machining, through the buffer layer, the tangential force generated in the grinding process can be counteracted, friction of the thin-walled bearing ring is reduced, the tangential force is high-temperature-resistant and dissipates heat quickly, and high-temperature, extrusion deformation and etc. of the thin-walled bearing ring are prevented.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a working flow diagram of the antigravity shear-resisting and deformation-eliminating centerless grinding apparatus in the present invention.

FIG. 2 is a brief structural diagram of the antigravity shear-resisting and deformation-eliminating centerless grinding apparatus.

DETAILED DESCRIPTION

In order to make those skilled in the art better understand the technical scheme of the present invention, further description on the present invention will be made below in combination of embodiments and drawings. But the implementation modes of the present invention are not limited herein.

Referring to FIG. 1 to FIG. 2, the antigravity shear-resisting and deformation-eliminating centerless grinding apparatus in the embodiment includes a grinding tool 2 configured to grind a thin-walled bearing ring 5 and a clamping mechanism configured to clamp the thin-walled bearing ring 5 stably, wherein the clamping mechanism includes a main clamping mechanism and an auxiliary clamping mechanism; the main clamping mechanism includes an electromagnetic centerless clamp 1 and the auxiliary clamping mechanism includes an electromagnetic coil 3 and a center buffer clamp 4; the center buffer clamp 4 is arranged on an inner side of the thin-walled bearing ring 5 being ground; and the electromagnetic coil is arranged above the thin-walled bearing ring 5 being ground.

Referring to FIG. 1 to FIG. 2, the center buffer clamp 4 is of an annular structure, and an inner side surface thereof is provided with a plurality of buffer grooves; a buffer reinforcing rib is formed between adjacent two buffer grooves; and the center buffer clamp 4 is arranged on the electromagnetic centerless clamp 1. Through the structure, during machining, through the buffer layer, the tangential force generated in the grinding process can be counteracted, friction of the thin-walled bearing ring 5 is reduced, the tangential force is high-temperature-resistant and dissipates heat quickly, and high-temperature, extrusion deformation and etc. of the thin-walled bearing ring are prevented.

Referring to FIG. 1 to FIG. 2, the main clamping mechanism further includes a supporting plate, the supporting plate includes a first supporting plate 6 and a second supporting plate 7, and the first supporting plate 6 and the second supporting plate 7 are symmetrically arranged below the thin-walled bearing ring 5 being ground.

Referring to FIG. 1 to FIG. 2, a working principle of the antigravity shear-resisting and deformation-eliminating centerless grinding apparatus in the embodiment is as follows:

during work, as a thickness of the thin-walled bearing ring 5 is relatively small and the thin-walled bearing ring 5 is of certain gravity with the addition of the tangential force generated during grinding, the thin-walled bearing ring has deformation invisible to the naked eye. It is found by verification of an experiment that the ground thin-walled bearing ring 5 becomes elliptical and even the surface generates cracks. After gravity of the thin-walled bearing rings 5 of different types is determined, the magnetic force to the thin-walled bearing ring 5 is changed by adjusting a number of turns, a current and a voltage of the electromagnetic coil 3, such that the gravity is just counteracted and extrusion deformation is prevented. The inner side of the center buffer clamp 4 is provided with a groove and a reinforcing rib. During machining, through the buffer layer, the tangential force generated in the grinding process can be counteracted, friction of the thin-walled bearing ring is reduced, the tangential force is high-temperature-resistant and dissipates heat quickly, and high-temperature, extrusion deformation and etc. of the thin-walled bearing ring 5 are prevented.

Referring to FIG. 1 to FIG. 2, the antigravity shear-resisting and deformation-eliminating centerless grinding machining method in the embodiment includes the following steps:

(1) a preliminary experiment is carried out according to a model of a to-be-machined thin-walled bearing ring to determine gravity thereof;

(2) a parameter of an electromagnetic coil 3 is adjusted according to the gravity of the thin-walled bearing ring 5, such that a magnetic force generated by the electromagnetic coil 3 is counteracted with the gravity of the thin-walled bearing ring 5 acting on the electromagnetic centerless clamp 1;

(3) the thin-walled bearing ring 5 is mounted on the electromagnetic centerless clamp 1 and the center buffer clamp 4 is mounted on an inner side of the thin-walled bearing ring 4;

(4) a grinding tool 2 is started, wherein the grinding tool 2 machines an outer surface of the thin-walled bearing ring 5 rotatably, and the center buffer clamp 4 counteracts a tangential force from extrusion of the grinding tool 2 on the inner side of the thin-walled bearing ring 5 while the thin-walled bearing ring is ground; and

(5) after grinding is completed, the thin-walled bearing ring is taken down for subsequent machining.

Further, in the step (2), after the gravity of the thin-walled bearing rings 5 of different types is determined, the magnetic force to the thin-walled bearing ring 5 is changed by adjusting a number of turns, a current and a voltage of the electromagnetic coil 3, such that the gravity is just counteracted and extrusion deformation is prevented.

Further, in the step (3), the electromagnetic coil 3 is uniformly arranged and mounted in a middle of the electromagnetic centerless clamp 1, and the position and the number of turns thereof can be adjusted and the electromagnetic coil is located in a position right above the thin-walled bearing ring 5.

The above are preferred modes of execution of the present invention. The modes of execution of the present invention are not limited by the content. Any other changes, modifications, substitutions, combinations and simplifications made without departing from the spirit and principle of the present invention shall be equivalent substitute modes and shall come within the protection scope of the present invention.

Claims

1. An antigravity shear-resisting and deformation-eliminating centerless grinding apparatus, comprising a grinding tool configured to grind a thin-walled bearing ring and a clamping mechanism configured to clamp the thin-walled bearing ring stably, wherein the clamping mechanism comprises a main clamping mechanism and an auxiliary clamping mechanism; the main clamping mechanism comprises an electromagnetic centerless clamp and the auxiliary clamping mechanism comprises an electromagnetic coil and a center buffer clamp; the center buffer clamp is arranged on an inner side of the thin-walled bearing ring being ground; and the electromagnetic coil is arranged above the thin-walled bearing ring being ground.

2. The antigravity shear-resisting and deformation-eliminating centerless grinding apparatus according to claim 1, wherein the center buffer clamp is of an annular structure, and an inner side surface thereof is provided with a plurality of buffer grooves; and a buffer reinforcing rib is formed between the adjacent two buffer grooves.

3. The antigravity shear-resisting and deformation-eliminating centerless grinding apparatus according to claim 1, wherein the main clamping mechanism further comprises a supporting plate, the supporting plate comprises a first supporting plate and a second supporting plate, and the first supporting plate and the second supporting plate are symmetrically arranged below the thin-walled bearing ring being ground.

4. An antigravity shear-resisting and deformation-eliminating centerless grinding machining method, comprising the following steps:

(1) carrying out a preliminary experiment according to a model of a to-be-machined thin-walled bearing ring to determine gravity thereof;

(2) adjusting a parameter of an electromagnetic coil according to the gravity of the thin-walled bearing ring, such that a magnetic force generated by the electromagnetic coil is counteracted with the gravity of the thin-walled bearing ring acting on the electromagnetic centerless clamp;

(3) mounting the thin-walled bearing ring on the electromagnetic centerless clamp and mounting the center buffer clamp on an inner side of the thin-walled bearing ring;

(4) starting a grinding tool, wherein the grinding tool machines an outer surface of the thin-walled bearing ring rotatably, and the center buffer clamp counteracts a tangential force from extrusion of the grinding tool on the inner side of the thin-walled bearing ring while the thin-walled bearing ring is ground; and

(5) after grinding is completed, taking the thin-walled bearing ring down for subsequent machining.

5. The antigravity shear-resisting and deformation-eliminating centerless grinding machining method according to claim 4, wherein in the step (2), after the gravity of the thin-walled bearing rings of different types is determined, the magnetic force to the thin-walled bearing ring is changed by adjusting a number of turns, a current and a voltage of the electromagnetic coil, such that the gravity is just counteracted and extrusion deformation is prevented.

6. The antigravity shear-resisting and deformation-eliminating centerless grinding machining method according to claim 4, wherein in the step (3), the electromagnetic coil is uniformly arranged and mounted in a middle of the electromagnetic centerless clamp, and the position and the number of turns thereof can be adjusted and the electromagnetic coil is located in a position right above the thin-walled bearing ring.