Test square box

 Test square box is mainly used for parts parallel, vertical inspection and marking of the workpiece support, usually the same side of the cube, can produce a variety of specifications and high-side boxes and rectangular tube according to user requirements. Test square box uses: square box is mainly used for parallelism, verticality and other parts of the inspection and marking. Square box is a hollow cube has six face made of cast iron, in which a working surface of a V-groove. Square box test of the environmental conditions of normal temperature and normal humidity. Square box test requirements: square box of each working face can not have rust, other defects scratches, cracks, dents and the impact of performance measurement. Non-face to be painted sand, edge chamfering. In the square box inside wall should be signs, and marked with the size, level serial number, manufacturer name. Square box test accuracy: development side box except for the scratch test plane givers, but also to test the contact is coated with color spots. In the side length of the square of any number of spots within 25mm to: 1, 2 less than 25 points; 3 less than 20 points. Test square box test method and the general cast iron boxes similar to the side length of 300mm and below the square box, square box is placed on each side of both ends of the seized amount of 1mm when test block, the knife-edge ruler on the Block Face , and then each was indecent amount of block test at the plug, and both ends of the size difference between the amount of the block size of the equivalent block group just squeezed for time deviation between the two ends are indecent in its. The test should also face the square box longitudinal, transverse and diagonal directions were several sections. When the agreement takes on its maximum in a straight line at various locations in the measured error direction, whichever is the greatest positive difference between the maximum negative difference in the absolute direction and when the error is inconsistent, the flatness of the flat surface for the subject. Square box test specifications and accuracy: verticality Specification (mm) Face flatness and parallelism face V-groove on the bottom and sides of parallelism accuracy class (μm) 1 2 3 1 2 Level 级 3 100 × 100 × 100 3.5 7 15 7 15 30 150 × 150 × 150 4 9 17 8 18 35 200 × 200 × 200 4.5 10 20 9 20 40 250 × 250 × 250 5 11 22 10 22 45 300 × 300 × 300 12 25 25 50 400 × 400 × 400 15 30 30 60 500 × 500 × 500 35 70 600 × 600 × 600 40 80