Shanxi black processing technology
With the tolerance of the inner corner of 0.13mm tolerance, the length of the length of 500mmx400mm 90 steel angle measurement. The short side of the angle of the rod is close to the long side of the short side of the black sheet of Shanxi. The long gap between the length of the plate and the long side of the ruler is measured with a stopper or vernier caliper. When the length of the black sheet in Shanxi is less than or equal to 500mm, it is possible to measure the four corners of the sheet when the long side of the sheet is longer than 500mm. The measured value of the maximum gap indicates that the angle tolerance of the plate is accurate to 0.1 mm.
Appearance quality testing
① pattern tone will be plywood plate and quite test plate flat on the ground from the board at 1.5m standing visual. ② artificial chisel plate will be flat on the ground from the board at 1.5m visual inspection. ③ the number of lines of color lines. ④ angle and collapse angle with a vernier caliper to measure the length of the defect, width, height visual number of missing angle. ⑤ step with a vernier caliper measure the height of the step height measurement as the height of the step. ⑥ crack visible cracks using visual method implicit crack with hammer method that is hit with metal hammer plate through the sound is generally mute to identify whether there is a crack to determine. ⑦ stains with a vernier caliper to measure the size of the spot to see the number of stains. The hardness of the stone Shanxi black is relatively soft stone in the Mohs hardness table MOHS Shanxi black level is probably 3 up to 10.