Tooling for folding press for air folding

Details Tooling for folding press for air folding Tooling for folding press for air folding

1993-04-20

1994-04-26

Jones, David

Metal deforming

By relatively movable offset tool-faces

With tool motion in fixed path

72413, 72446, 72481, B21D 3702

Patent

active

053056590

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a tooling for a folding press for air folding.
When it is desired to fold sheets of different thicknesses by means of a folding press comprising a known tooling, it is necessary to proceed to a change of die which requires important means regarding equipment and manpower for handling with a view to the size and the weight of the dies which are generally used. Since any change of die requires a new adjustment of the press, the time for adjustment adds to the time of changing and implies important time losses. The same problem arises when it is desired to change the radius of the folding to be obtained.
The object of the present invention is to remedy the above inconvenience by proposing a tooling for a folding press allowing to fold sheets of different thicknesses with the same die.
To this effect, the invention relates to a tooling for a folding press for air folding.
The invention will be well understood with the help of the following description of a tooling for a folding press according to the invention, given by way of example and with reference to the drawing in which
FIG. 1 is a vertical section of the tooling,
FIG. 2 is a vertical section of the tooling of FIG. 1 programmed for other conditions of folding than those of FIG. 1,
FIG. 3 is a view from above of the actuating device for the movement of the two half-dies,
FIG. 4 is a lateral view of the device of FIG. 3, and
FIG. 5 is a partial vertical section of the tooling of FIG. 1 programmed for making crushed foldings.
The tooling shown in FIGS. 1 to 5 is mounted on a table of the lower frame 22, the table comprising two parts 12,12' arranged on either side of the folding plane 23 defined by the movement of the edge of the end of the male die 3,4. Two half-dies 1,1' are arranged on the respective parts 12,12' of the table on either side of the folding plane 23, symetrically with respect to that plane. Each of the half-dies comprises a vertical longitudinal face 24,24', said two vertical faces being spaced from each other so as to present a vertical space forming the folding V. Each of the half-dies 1,1' is arranged on one of the corresponding parts 12,12' of the table, so as to be capable of laterally sliding with respect to these parts.
The tooling includes a symetrical actuating device for the movement of each of the two half-dies. This device comprises for each of the half-dies a plurality of pairs of inclined shims 9,10, respectively 9',10', arranged horizontally at the upper outer part of half-die 1, respectively 1', covered by covering plates 8, respectively 8'. The shims 9, respectively 9', which can be considered as fixed shims, are secured to the half-die 1, respectively 1', by means of fixing devices 20, respectively 20', for example by screws. The shims 10, respectively 10', which can be considered as the movable shims, are fixed on a traction bar 11, respectively 11', by means of fixing devices 21, respectively 21', for example by screws. As shown in FIGS. 3 and 4, the respective ends of the traction bars 11 and 11' are fixed on either side of a screw-nut 13, cooperating with a ball screw 14, itself coupled with a worm reduction gearing 15 coupled with a d.c. motor 17, the whole being mounted on a support 16. The motor is connected to an incremental sensor 18 and is controlled by a programmable electronic device, such as for example a numerical control device or a computer.
When the above described driving device acts to pull the bars 11,11', so as to move the same towards the left on FIG. 3, the inclined shims 10,10' also move towards the left and subject the shims 9,9' to a lateral movement in the direction of the folding plane 23, bringing the two half-dies closer to each other and, consequently, lead to a reduction of the width 7 of the folding V. When the driving system acts in the other direction, the inclined shims 10,10' move in the opposite direction and allow the two half-dies to move apart under the action of a separation means, such as for example a bent spring steel blade 19, as shown in FIG.

REFERENCES:
patent: 784725 (1905-03-01), Yates
patent: 4106323 (1978-08-01), Haenni et al.
patent: 4367644 (1983-01-01), Kramer et al.
patent: 4653307 (1987-03-01), Zbornik
patent: 4926676 (1990-05-01), Bailey et al.

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