SAE AS 5282B:2020 pdf free
SAE AS 5282B:2020 pdf free.Tool Steel Ring for Magnetic Particle Inspection
Surface oil or grease shall be removed from each ring before magnetization. Each ring shall be magnetized at 1500 A, in accordance with 4.1. Remove the magnetized ring from the central conductor bar and place it in a fixture (Figure 2). Calibrate the gauss meter in accordance with the manufacturer’s instructions. The gap between the gauss meter probe face and the ring surface shall be adjusted for a lift-off of 0.001 to 0.0015 inch (0.025 to 0.038 mm). The ring shall rotate smoothly on the fixture rollers without any wobble.
NOTE: If a series of rings are to be evaluated, magnetize and evaluate the rings in a uniform orientation to avoid a reverse in polarity of the leakage field.
Rotate the ring or rollers so that hole #1 is centered over the gauss meter probe. Slowly rotate the ring back and forth, past the sensing probe, and record the optimum gauss meter value. Repeat this process at each hole (#2 through #9).
Graph the results with the hole numbers along the abscissa (horizontal) and gauss values along the ordinate (vertical). Join each value with a line to generate a smooth curve (Figure 3). For additional rings in a lot, repeat the steps in 4.2 through 4.2.2. Upon completion of the lot measurement, calculate the average gauss value at each hole for those rings which exhibit a smooth curve (Table 1, Rings 2-4) and plot the mean average curve (Figure 4).
Example: The mean average value for Rings 2-4, at hole #1, is 21 gauss and 10% of this value is 2.1 gauss. The upper and lower acceptance limit for Rings 2-4 are plotted at +2.1 gauss from the mean average curve (Figure 4). Using a best fit curve, draw the mean curve for Ring 1 (Figure 4). The value for hole #1 (Ring 1) is 15 gauss and the upper and lower limits are 1.5 gauss. It is obvious that Ring 1 values do not generate a smooth curve and they fall outside the acceptance limits.SAE AS 5282B pdf free download.
