Ball head-conical surface sealing leakage analysis and measurement method based on extrusion traces

The invention discloses a ball head-conical surface sealing leakage analysis and measurement method based on extrusion traces, three sealing elements are respectively mounted at three joints of a direct injection system in a 200bar high-pressure fuel cylinder, and each sealing element comprises a ball head, an outer sleeve nut and an inner conical surface joint; tightening the outer sleeve nut to form an annular sealing belt between the ball head and the inner conical surface; the method comprises the following steps: acquiring various parameters of an annular sealing tape based on a measuring instrument, and dividing the annular sealing tape into A-type indentations, B-type indentations and C-type indentations; for the A-type indentation, the roundness of the ball head indentation or the roundness of the conical surface indentation is rectified, so that the roundness of the ball head and the conical surface indentation is smaller than or equal to 0.02 mm; for B-type indentations, the centering performance of