The invention relates to a CNC (Computerized
Numerical Control) automatic internal
grinding machine for a bearing ring. The internal
grinding machine comprises a lathe body, a reciprocating worktable, a
grinding wheel shaft
assembly, a workpiece axle box, a
grinding wheel dresser, a longitudinal feed transmission mechanism, a transverse feed transmission mechanism, a cooling
system, a hydraulic
lubrication system, a CNC
control system host and operating panel, and an
electrical control system, wherein the reciprocating worktable, the
grinding wheel dresser and the workpiece axle box are arranged on the lathe body; the
grinding wheel shaft
assembly is arranged on the reciprocating worktable; the longitudinal feed transmission mechanism and the hydraulic
lubrication system are arranged inside the lathe body; the transverse feed transmission mechanism is arranged on a grinding wheel seat; the cooling system and the
electrical control system are arranged at the rear side of the lathe body; the CNC
control system host and operating panel is arranged above the reciprocating worktable; and the reciprocating worktable is arranged on a guide rail of the lathe body. The CNC automatic internal grinding
machine for the bearing ring, provided by the invention, has the outstanding advantages of simple and compact structure, strong static and dynamic rigidities, locating precision, good performances of anti-vibration and vibration reduction, good precision retentivity, light friction and abrasion, long service life, easiness for operation and maintenance, safety, saving energy, environment friendliness, attractive appearance and the like.