Metal deforming – With means to drive tool – Including link-actuated tool support
Patent
1990-08-20
1991-09-24
Jones, David
Metal deforming
With means to drive tool
Including link-actuated tool support
72314, 72452, 2924358, 100271, 100280, B21J 918
Patent
active
050504223
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to apparatus for bending a margin flange, which projects at an angle to a surface on a workpiece, against said surface, said apparatus including a bending tool which is mounted on a tool holder, by means of which a linkage mechanism is connected to a stand which carries the workpiece, and further includes a drive arrangement which is connected to the tool holder in a manner to move said tool holder in relation to the stand.
Apparatus of this kind are previously known and are used, for instance, for bending a margin flange on a metal sheet workpiece around the margin of another metal sheet workpiece, such as to produce a clinching or hemming joint which joins the two workpieces together. Operations of this kind are common, for instance, within the vehicle manufacturing industry, in the production of different vehicle body parts.
The object of the invention is to provide an improved apparatus of the aforedescribed kind. This object is achieved in accordance with the invention in that the linkage mechanism which connects the tool holder to the stand includes two mutually parallel carrier links, each of which is pivotally mounted at one end thereof on a respective journal pin located on the tool holder; in that the other end of the first carrier link is pivotally mounted on a fixed journal pin on the stand, said journal pin also pivotally carrying one end of a connecting link, the other end of which is pivotally connected to the other end of the second carrier link, by means of a pivot pin; and in that the drive arrangement includes a drive member which is attached to the stand and connected to the second carrier link for movement of said link and therewith of the tool holder, and also a camming device which is driven by the drive member and intended for activation of a cam follower which is mounted on the first carrier link and which projects upwardly from the other end of said carrier link in a direction away from the tool holder.
The invention will now be decribed in more detail with reference to the accompanying drawings, in which
FIG. 1 is a somewhat schematic side view of a bending apparatus constructed in accordance with one exemplifying embodiment of the invention;
FIG. 2 is a schematic side view of the apparatus of FIG. 1, and shows the apparatus components in their respective starting positions prior to commencing a working sequence;
FIG. 3 is a schematic side view of the apparatus of FIG. 1, and shows the apparatus components in their respective preliminary bending positions while carrying out a working sequence; and
FIG. 4 is a schematic side view of the apparatus of FIG. 1, and shows the apparatus components in their respective bend finishing or clinching positions.
The bending apparatus illustrated in the drawings comprises a stand 1 which is intended to be secured to a supporting surface (not shown) by means of fastener bolts 2, of which only one is shown in FIG. 1. The stand 1 carries a holder 3, on which a workpiece 4 is placed. In the illustrated embodiment, the workpiece 4 comprises a sheet metal rail having the margin flange 5, which, in the starting position illustrated in FIG. 2, extends upwards from the major part of the workpiece 4. FIG. 3 shows the margin flange in a preliminary bent or pre-form state, whereas FIGS. 1 and 4 show the flange subsequent to being fully bent, in which it clinches against an adjacent surface on the workpiece 4. Perpendicularly to the plane of the drawing the workpiece 4 may have considerable length, and may be straight or curved in different directions, the holder 3 naturally being configured to provide support for the workpiece 4 over the whole of its length.
Bending of the margin flange 5 from the starting position illustrated in FIG. 2 to the pre-bend position ilustrated in FIG. 3 and further to the fully bent or clinching position illustrated in FIG. 4, is effected with the aid of a bending tool 6. When seen at right angles to the plane of the drawing, the bending tool 6 has a shape which conforms with the shape of the workp
REFERENCES:
patent: 2443573 (1948-06-01), Brundage
patent: 2642111 (1953-06-01), Bindszus
patent: 3058512 (1962-10-01), Chebuhar et al.
patent: 4346579 (1982-08-01), Takatsu
patent: 4706489 (1987-11-01), Dacey, Jr.
AB Volvo
Jones David
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