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Cast iron inspection square box
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The cast iron inspection square box is mainly used for the parallelism and verticality inspection of parts and supports the workpiece during scribing. It is generally a square or rectangular parallelepiped with the same side length. Various specifications and contour boxes and rectangular tubes can be made according to user requirements. .
Cast iron square box: manufactured according to JB/T3411. 56-99 standard, material HT200.
1. Use: Square box is mainly used for inspection and scribing of parallelism and verticality of parts. The square box is a cavity cube of a specific six working faces made of cast iron, and one of the working faces has a V-shaped groove. Environmental conditions for square box testing: normal temperature, normal humidity.
2. Requirements: There should be no rust, scratches, cracks, dents and other defects affecting the metering performance of the working faces of the square box. The non-working surface should be sand-painted and chamfered. There should be signs on the inner wall of the square box, and marked with the size, grade number and manufacturer name.
3. Accuracy: In addition to verifying the flatness of the square box, the contact spot is also determined by the coloring method. The number of spots in any square with a side length of 25 mm is: 1 level, 2 levels is not less than 25 points; level 3 is not less than 20 points.
4. Square box verification method For a square box with a side length of 300 mm or less, a 1 mm gauge block is placed at each end of the square box to be inspected, and the knife edge is placed on the gauge block working surface, and then in each The amount of the block at the point to be inspected is tested, and the difference between the size of the equivalent block group and the size of the block at both ends is the deviation between the ends of the pair. This test shall also be carried out on several sections in the longitudinal, transverse and diagonal directions of the square face. When the error directions in the straight lines of the measured positions are the same, the large value is taken. When the error directions are inconsistent, the sum of the large positive difference and the large negative difference is taken as the flatness of the plane of the examined surface.
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