Method and device for calibrating friction distance in polishing value measurement

The invention discloses a method and device for calibrating a friction distance in polishing value measurement. The method comprises the following steps: adjusting the pulse number of a pendulum bob at a horizontal position to zero; rotating the pendulum bob, and when a sliding block of the pendulum bob is in contact with the right end of the test piece, enabling the pressure sensor to start to monitor the force value variation between the sliding block and the test piece; when the force value is increased to 3N, enabling the data acquisition and processing system to record the corresponding encoder reading P1 at the moment; lifting the pendulum bob to be located at the left end of the test piece; rotating the pendulum bob from left to right, and when the sliding block is in contact with the left end of the test piece, enabling the pressure sensor to start to monitor the force value variation between the sliding block and the test piece; when the force value is increased to 3N, enabling the data acquisition a