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.

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.