The invention relates to a
polishing device for a high-temperature
alloy inwards-protruding tube. The
polishing device comprises a rotating device, a
grinding-tool rotation driving device, a connecting rod and a
grinding tool. The rotating device is rotatably snapped at one end of the high-temperature
alloy inwards-protruding tube, the
grinding-tool rotation driving device is connected with one end of the connecting rod, a top plate is arranged on a
coolant delivery device, the other end of the high-temperature
alloy inwards-protruding tube is hermetically and rotatably supported on the top plate, the
coolant delivery device is communicated with an inner cavity of the high-temperature alloy inwards-protruding tube through the top plate, one end of the connecting rod penetrates the
coolant delivery device to be connected with a rotating rod of the grinding-tool rotation driving device, the other end of the connecting rod penetrates the top plate and the inner cavity of the high-temperature alloy inwards-protruding tube to be connected with the grinding tool. The coolant delivery device is adopted to rotatably support the high-temperature alloy inwards-protruding tube and grinding cooling is performed inside the high-temperature alloy inwards-protruding tube, so that requirements on
polishing inside an elongated inwards-protruding tube are met, and the polishing device has the advantages of simple structure, convenience in use, high efficiency, long service life, good grinding quality and high accuracy.