Process for underlaying a flat-bed steel rule die
AssigneeBASF SE
InventorsHeinz Mohr, Walter Hoffmann, Rudolf Vyvial
Life of this patent
Estimating the term…
Abstract
A process for underlaying flat-bed steel rule dies prior to producing sheet-like geometrical cut blanks, preferably from multi-blank sheets, in which varying tolerances, in the punching and cutting direction, of the steel rule cutters held in a rigid plate are compensated by a sheet, corresponding to the area of the sheet being cut, placed on the back of the steel rule cutter plate and consisting of a flowable hardenable plastic, the upper and lower platen being moved together so as to close the die and the sheet of plastic, bearing the relief formed thereon, then being solidified by an after-treatment.
Claims7
A process for underlaying flat-bed steel rule dies of a punch or press having upper and lower platens prior to the production of sheet-like geometrical cut blanks, for example, for folding boxes and similar cuboid containers consisting of paper, cardboard or soft metals, preferably where multi-blank sheets are concerned, so as to compensate for the varying tolerances of the steel-rule cutters in the punching and cutting direction and the different force fluxes of the punching pressure in the cutters plate fitted with the steel rule cutters, said process comprising:
- applying to the back of the steel-rule cutter plate, a sheet bonded to a dimensionally stable base, of a flowable plastic, which can be hardened at below 100.degree. C. to give a hard crosslinked plastic, the sheet having a preselected thickness and corresponding in size to the total area of the sheet from which the blanks are to be cut;
- then moving the upper and lower platens of the punch or press together, with the steel-rule cutter plate between them so as to emboss a relief on said sheet of flowable plastic;
- opening the platens again;
- then solidifying the sheet bearing the relief formed therein, by an after treatment outside of the press;
- and
- replacing the sheet between the back of the steel-rule cutter plate and the corresponding platen of the press.
Dependencies are inferred from the claim text.