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公开(公告)号:US20170206882A1
公开(公告)日:2017-07-20
申请号:US15328243
申请日:2015-07-24
CPC分类号: G10K11/002 , B21D28/265 , B21D53/80 , B26F1/02 , B26F1/14 , B26F1/24 , G10K11/162 , H04R1/2876
摘要: There is provided a method of producing acoustic damping elements having an acoustic resistance. For that purpose at least one sleeve with a hole having a diameter is placed below a base material. At least one hole is stamped in the base material by at least one punch having a punch diameter. The punching operation is repeated at various positions on the base material.