The internal bore grinding machines adapted to the internal bore coating grinding requirements of the thermal spray industry mostly adopt CNC control or planetary structures, are equipped with high-rigidity beds, high-precision guide rails and specialized grinding accessories, can cope with the characteristic of uneven surface hardness of internal bores after thermal spraying, efficiently grind the internal bores of thermally sprayed workpieces such as engine cylinder blocks and hydraulic cylinders, accurately ensure the dimensional tolerance, roundness and surface roughness of internal bores, and some models can also realize compound grinding of internal bores and end faces with one-time clamping, meeting the high-precision processing requirements of workpieces after thermal spraying.