Flange face screw hole perpendicularity measuring method

Abstract

The invention provides a flange face screw hole perpendicularity measuring method, which comprises the following steps: when the depth of the lower end of a positioning rod entering a screw hole is H, stopping the positioning rod from continuously rotating, then calculating the corresponding screw hole allowable maximum offset K and the screw hole perpendicularity sigma when the depth of the flange face screw hole is H, then fixedly attaching a detection ring to a flange face, and finally measuring the perpendicularity of the flange face screw hole. After the positioning rod is sleeved with the rotating rod, the rotating rod drives the dial indicator to rotate around the positioning rod in the area of the upper end face of the outer ring body of the detection ring, so that the difference value delta B between the maximum value Bmax and the minimum value Bmin in the numerical values of the dial indicator is measured, and finally the theoretical difference value # imgabs0 # and the actual difference value # imgabs1 # measured by the dial indicator are compared, so that the detection accuracy is improved. And meanwhile, the direction of the position of the rotating rod at the minimum value Bmin recorded by the dial indicator is determined as the deflection direction of the flange face screw hole, so that the screw hole is convenient to correct.

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