Method and apparatus for producing openings in sheet material

Details Method and apparatus for producing openings in sheet material Method and apparatus for producing openings in sheet material

B - Operations, Transporting

21

D

164/97

B21D 28/26 (2006.01) B21D 31/04 (2006.01)

Patent

CA 1083031

"Method and apparatus for producing openings in sheet material" Abstract of the disclosure A method and an apparatus for producing openings in sheet metal material being provided in band form as well as a perforated sheet material produced by said method. The method comprises providing notches in the sheet material and stretching partial areas of the notched sheet material by a thickness-reducing processing step, whereby the notches which lie between the stretched partial areas of the notched sheet material are en- larged to form openings. The apparatus for producing openings in sheet metal material comprises roller means for producing notches in the sheet material and roller means for stretching partial areas of the notched sheet material by thickness reduction. The resulting perforated sheet metal material combines the advan- tages of punched sheet metal, i.e. mechanical stability, and expanded metal mash, i.e. no loss of material during production of the openings in the sheet material.

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