Aka square box square box holder
1, square box uses:
Square box is a specific six cube face of the cavity made of cast iron or steel, which has a work surface V-groove. Square box is mainly used for parallelism, verticality and other parts of the inspection and marking. verification of environmental conditions: ambient temperature, and humidity.
2, square box production standards and requirements:
Face each square box can not have rust, other defects scratches, cracks, dents and impact measurement of performance of non-working surface should be painted sand, edge chamfering. In the inner wall of the square box should be signs, and marked with the specification size, level serial number, manufacturer name.
3, square box of accuracy and calibration standards:
1) Accuracy: square boxes except for the scraping plane test-givers, but also with the contact spot color test is coated on the side length of the square of any number of spots within 25mm is: 1, 2 less than 25 points; 3 level less than 20 points.
2) square box test method:
For the side length of 315mm and below the square box, square box was seized at both ends of each surface when placed 1mm gauge block test, the knife lip ruler on the amount of block work surface, and the amount to be indecent in their respective office block test plug, the difference between both ends of the size and the amount of the block size of the equivalent block group just for being indecent when squeezed deviation between the two ends. This test should also face the square box vertical, horizontal and diagonal conducted several directions on the section line in the direction of the line coincides error measured at each position whichever is maximum, whichever is the greatest positive difference between the absolute value of the difference between the maximum negative and when the error direction is inconsistent, for subjects flatness of the surface plane.
4, square box Introductory description
1), square box performance standards and use:
Square box by JB / T3411.56-99 standards for manufacturing, material HT200, for parts parallelism, verticality inspection and marking; universal line at any angle or crossed square boxes used to test precision parts, according to user require the production of various sizes and high-side boxes and rectangular tube.
2), square box specifications and flatness, parallelism and verticality.