Steel ball diameter measuring method and device for measuring diameter of steel ball

The invention relates to the technical field of steel ball diameter measurement, in particular to a steel ball diameter measurement method and a device for measuring the diameter of a steel ball. The device for measuring the diameter of the steel ball comprises a measuring tool and a fixed seat, wherein a groove is formed in the fixed seat; the measuring tool is positioned vertically above the groove; the measuring tool is used for measuring the height of the highest point of the steel ball; the groove wall of the large-diameter end of the conical groove is used for being tangent to a steel ball placed in the conical groove in a tangent circle mode, the axis of the conical groove passes through the circle center of the tangent circle, and the plane where the tangent circle is located is perpendicular to the axis of the conical groove. When the steel ball is measured, the height difference value and the diameter difference value of the to-be-measured steel ball and the standard steel ball are in an amplified r