Design Specifications for Tools - KIRCHHOFF Automotive

Projections for standard use(ISO 8167 : 1989) group BGerman version EN 28167 : 1992Sheetthickness tProjection diameter d1t ≤ 0,5 20,5 < t ≤ 0,63 2,50,63 < t ≤ 1 3,21 < t ≤ 1,6 41,6 < t ≤ 2,5 52,5 < t ≤ 3 6,3D1 ) +0,1/0 a²) d2 0,5 0,632,5 0,63 0,83,2 0,8 14 1 1,255 1,25 1,66,3 1,6 2The diameter of the punch d3 must be ≥ d1) see part 3 height limits of aDimensions:The diameter limits of the projection diameter d1 is +1mm, the limit of the height is a±10%, with the exemption, that a number of projections is welded simultaneously in one stagewhere the height of each must not vary more than 5%Annotation1: The height a is defined by the stroke heightAnnotation 2: At different sheet sizes, the projection of the thicker one must be made with thedimensions off the thinner sheet.20