Metal deforming – By relatively movable offset tool-faces – Embodying three or more coacting relatively movable tools
Patent
1988-06-08
1989-06-20
Spruill, Robert L.
Metal deforming
By relatively movable offset tool-faces
Embodying three or more coacting relatively movable tools
72385, 72428, B21D 1302
Patent
active
048400548
DESCRIPTION:
BRIEF SUMMARY
The present invention arrangement relates to an arrangement for profiling a forwardly indexed material web, and more specifically for forming regularly occurring, mutually parallel, transverse corrugations or like folds in a sheet metal web, preferably of uniform width, during which the web is indexed forwardly through a forming space or area provided in the arrangement.
Thus, the invention relates to a technique which is primarily intended for profiling thin material webs, e.g. thin sheet metal strips, of uniform width in a manner to form mutually parallel, contiguous corrugations or folds that extend tranversely of the longitudinal axis of the strip. This technique can be applied, for instance, in the manufacture of strips of metal nails or like fasteners, i.e. nails formed in a common metal strip, in which the individual nails are given a specific profile (e.g. V-shaped configuration) and are each connected to a mutually adjacent nail through the intermediary of narrow tabs extending between the long sides of mutually adjacent nails. Nail strips of this kind are primarily intended for use in nail firing guns, for industrial purposes. Such guns are constructed to separate one nail at a time from the nail strip, during a nailing operation. One example of metal nail strips of the aforesaid kind is found described and illustrated in Swedish patent application Ser. No. 8504557-3.
The present invention is thus based on a technique in which the material web (the metal strip) is corrugated or likewise profiled by plastic deformation of the web material, more specifically by successive, stepwise bending of the web (strip), with the aid of a punch having a forming or shaping edge that extends transversely to the longitudinal axis of the web on one side thereof, e.g. a bending edge, and a die or forming bed which lies supportingly against the other side of the web and against which the punch executes a forming or shaping impact force (bending impact).
At the actual moment of forming a corrugation or like fold, i.e. at the precise moment when the forming tool is brought into impact engagement with the web (the strip) to deform the web material plastically, the forward feed of the web is stopped temporarily and the web held stationary. In order to ensure that the web material is deformed or folded at precisely the correct location on the web, upon engagement with the forming tool, so as to achieve the intended web configuration, for example a fold or corrugation which adjoins directly and immediately preceding fold or corrugation formed in the web by said forming tool, it has previously been necessary in practice to hold the web firmly on both sides of the location at which the forming tool is intended to engage the web. In this regard, the downstream section of the web (i.e. the web section that has already been profiled) is held stationary by means, for example, of a holding-down tool, which engages the profiled surfaces of the web (basic configurations) and holds the web firmly against the die/forming bed. If the upstream section of the web (i.e. the plain, non-profiled web section) is now held rigid, so as to be immovable, it is not possible in practice to prevent undesirable dilation, or excessive stretching, of the web material upon impact engagement of the forming tool with the web and subsequent deformation of the web material in the forming recess of the die/forming bed.
The problem on which the present invention is based is primarily one of preventing such stretching (dilation) of the web material when the web is subjected to impact shaping forces by the forming tool.
In accordance with the invention this problem is solved by means of an arrangement of the aforesaid kind which is characterized in that the forming or shaping space is located between a lower bed having mounted thereon a die having an upwardly turned forming surface thereon, and a holder device which is located above the forming space and which carries a punch mechanism that can be driven reciprocatingly towards and away from the die so as to
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patent: 2473533 (1949-06-01), Lebedeff
patent: 3430476 (1969-03-01), Duda
patent: 3673846 (1972-07-01), Levington et al.
patent: 4450706 (1984-05-01), Engelmohr
patent: 4627258 (1986-12-01), Loges et al.
Nordisk Kartro AB
Spruill Robert L.
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