Flatness test:
A steel ruler with a straightness tolerance of 0.1 mm is naturally placed on the two diagonal lines of the surface to be inspected, and a gap between the ruler surface and the plate surface is measured with a feeler gauge or a vernier caliper. The flatness of the sheet is indicated by the measured value of the maximum gap. The measured value is accurate to 0.1 mm.
Angle inspection:
Measured with a 90 degree steel square with an internal angle perpendicularity tolerance of 0.13 mm and an internal corner length of 500 mm x 400 mm. The short side of the square is placed against the short side of the sheet, the long side of the square is placed against the long side of the sheet, and the maximum gap between the long side of the sheet and the long side of the square is measured with a feeler gauge or a vernier. When the long side of the sheet is less than or equal to 500 mm, any pair of diagonals of the sheet can be measured; when the long side of the sheet is larger than 500 mm, the four corners of the sheet are measured.
The angular tolerance of the sheet is indicated by the measured value of the maximum gap. The measured value is accurate to 0.1 mm.
Appearance quality inspection:
1. The tone of the pattern shall be placed on the ground with the plate to be inspected and the plate to be inspected, and stand at 1.5 m from the plate for visual inspection.
2. Manually chiseling the plate flat on the ground, visual inspection at 1.5 m from the plate.
3. The number of color lines determines the number of lines.
4. Notch and chipping The length, width and height of the defect are measured with a vernier caliper; the number of missing corners is visually observed.
5. Steps The height of the step is measured with a vernier caliper, and the maximum value is measured as the height of the step.
6. The visible crack of the crack is determined by visual inspection, and the hidden crack is determined by hammering (that is, hitting the sheet with a metal hammer and discriminating whether it is cracked by sound or sound).
7. Spots The size of the stains is measured with a vernier caliper, and the number of stains in the wood book.
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