Detection device for measurement of diameter of round piece surface notch and method for measurement of diameter of round piece surface notch

The present invention relates to a detection device for measurement of the diameter of a round piece surface notch and a method for measurement of the diameter of a round piece surface notch. The method comprises: a measurement device is installed on a machine tool holder, a round piece to be measured is installed on a machine tool main shaft, a random cylindrical surface is selected as a reference, a reference value is obtained through measurement, the holder is moved, the distance of movement of the holder is calculated to obtain the difference of the diameter of the notch and the reference value, the difference is obtained through the movement of the holder, and the prismatic pairs of the machine tool holder use ball screws for transmission so as to have high precision. The measurement method provided by the invention has high precision and reliability, accurately measure the tolerance range of the diameter of the notch and is suitable for enterprises for detection of the diameters of the notches of large-