Method for precisely grinding large-scale special type curved surface and grinding equipment thereof

Abstract

The invention relates to a method for precisely grinding a large-scale special type curved surface and grinding equipment thereof in the technical field of machining. The equipment comprises a lathe body component, a spherical support mainshaft mechanism, a spherical support tailstock mechanism and an abrasive wheel grinding tool mechanism, wherein the spherical support mainshaft mechanism and the spherical support tailstock mechanism are respectively and movably arranged at two sides of the lathe body component, and the abrasive wheel grinding tool mechanism is arranged at the middle part ofthe lathe body component. In the invention, an abrasive wheel grinding tool horizontally rotates around a vertical center line so that the rotation center of a spherical body and the rotation center of the abrasive wheel grinding tool are always maintained in a vertically crossing state in the same plane, thereby ensuring the shape precision (sphericity) of the processed spherical body and improving the surface roughness of the spherical body processed by using the abrasive tool; and the upward grinding force counteracts partial gravity of the spherical body workpiece, therefore, the load of a spherical support mainshaft system bearing is lightened, and the service life of the spherical support mainshaft system bearing is prolonged.

Description

technical field [0001] The invention relates to a method in the technical field of mechanical processing and a device for realizing it, in particular to a precision grinding method and grinding equipment for a large special curved surface. Background technique [0002] Large-scale high-precision spheres are key components in large-scale fluid and gas control devices (large ball valves) in major projects such as large-scale oil and gas transportation, large-scale water conservancy, petrochemical, and coal chemical industries. The diameter of large spheres is generally 1000mm-2400mm, and the weight is 2000kg-15000kg. Due to the tightness requirements, the surface roughness of the sphere and the geometric accuracy of the sphere are very high, so the surface of the sphere must be precision ground and ground before it can be used. [0003] For the precision grinding of this large and heavy sphere, the current method is: the large sphere is supported by the top of the spindle sys...

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Problems solved by technology

[0006] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a large-scale special curved surface precision grinding method and its grinding equipment, which solves the problem of the cantilever support of the grinding wheel and abrasive tool in the prior art, and the unilateral force deformation of the bearing of the grinding wheel and abrasive tool system The problem and the influence of the wear of the feed guide rail slider of the grinding wheel and abrasive tool system keep the center of rotation of the sphere and the center of rotation of the grinding wheel and abrasive tool in a vertically intersecting state in the same plane, thus ensuring the shape accuracy (sphericity) of the processed sphere; The bearings of the grinding wheel and abrasive tool system bear axially uniform loads, and the force and deformation of the grinding wheel and abrasive tools of different sizes are uniform on the bearings. The surface roughness of the sphere processed by the abrasive tool is improved; in addition, the grinding wheel grinds vertically upwards (that is, it is ground from the bottom up under the sphere), and its upward grinding force offsets the gravity of part of the sphere workpiece, so that Reduced load on ball-supported spindle system bearings extends ball-supported spindle system and ball-supported tailstock mechanism bearing life

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