Metal deforming – By use of non-deforming work-gripping clamp and relatively... – By individually non-deforming clamps
Patent
1975-07-10
1976-11-09
Larson, Lowell A.
Metal deforming
By use of non-deforming work-gripping clamp and relatively...
By individually non-deforming clamps
72304, B21D 1104
Patent
active
039902889
ABSTRACT:
Stretch bending or dieing mechanism including a drawing die press having apparatus for tensioning and/or stretching a workpiece, typically in sheet form, at opposite ends of a lower horizontally oriented stationary die. Prior to or in timed relation with the movement of the movable die to form a workpiece having its opposite ends secured in clamp jaws of sheet clamp units of the tensioning and/or stretching apparatus, fluid pressure actuated motors which support the sheet clamp units are actuated to lower the units to stretch and wrap the workpiece partly about the lower die. Simultaneously the units are moved in a predetermined path away from the lower die to tension and/or stretch the workpiece, as desired, by link mechanism having links of different length spaced lengthwise of the path of movement of the movable die. The pivotal connection of the upper links with the clamp units is adjustable to provide different paths of downward travel of the clamp units which allows for greater or lesser stretch of the workpiece and the pivotal connection of the opposite ends of the upper links are movable to allow upward movement of the clamp units in a path different from that followed during their downward movement, which upward path is parallel with the path of movement of the movable die.
Movement of the sheet clamp units in the directions away from the lower die is resisted by the tension in the work sheet during the forming operation. After the forming operation is completed the clamp jaws are opened and the positions of the clamp units relative to the die during their upward movement is controlled by cam means.
The upper workpiece gripping or clamping jaws of the clamp units include further workpiece engaging surfaces on the die sides thereof curved to conform to the crosswise curvature or crown of the lower die which is curved or crowned in two directions, that is, both lengthwise and crosswise so as to uniformly stretch a workpiece to the die.
REFERENCES:
patent: 2676638 (1954-04-01), Wheeler et al.
patent: 3452573 (1969-07-01), Mackenzie
patent: 3459025 (1969-08-01), Bath
patent: 3677057 (1972-07-01), Mackenzie
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