Metal deforming – By plural tool-couples – With means to feed work between plural tool stations
Patent
1985-11-13
1988-06-28
Crane, Daniel C.
Metal deforming
By plural tool-couples
With means to feed work between plural tool stations
72422, 198345, 198621, 414121, 414752, B21D 4311, B21J 1308
Patent
active
047531037
DESCRIPTION:
BRIEF SUMMARY
This invention relates to an arrangement for the feeding of sheet-metal blanks to the first machining stage, especially to the drawing stage of a transfer press, having conveying means for taking sheet-metal blanks from a supply pile and for depositing them in an intermediate depositing station, for taking them from said intermediate depositing station and for transporting and depositing them in the first machining station, and having transfer rails that can be driven in transfer direction, in lifting and lowering direction and in closing and opening direction and having gripping devices arranged at said transfer rails for the transport of the workpieces between the machining stages.
The feeding of sheet-metal blanks to forming and reshaping tools in transfer presses today is fully automatic and as a rule requires only monitoring. Misrouting, such as a double-feeding of sheet-metal blanks, results in an early switching-off of the press or in the case of possible higher expenditures, during the supply in an ejection of the sheet-metal blank already in the feeding range witthout the switching-off of the press. However, for reasons of cost, the additional expenditures are decreased at the expense of the utilization of the press. In addition, in the case of transfer presses and especially those for large parts, a drawing stage is provided in the first machining stage in order to avoid a turning of the large-surface parts. The feeding of the sheet-metal blanks in this case requires extreme precision, means.
In DE-OS No. 29 00 526, a feeding arrangement for sheet-metal blanks to the first stage of a transfer press is described having the characteristics of this type. The sheet-metal blanks, by means of the suction lifting means of a vertical lifting mechanism, are taken from the supply pile, in the raised position are taken over by the suction cups of a horizontal conveying means and are fed to the transfer press. The feeding is timed with the press and takes place in a motion that is synchronous with the transfer rails between the machining stages. This feeding arrangement can only be used to a limited extent for transfer presses having a drawing stage as the first machining stage. The orientation of the sheet-metal blanks on the basis of the supply pile is not sufficient for a perfect depositing in the drawing tool, and it is not ensured that the indicated orientation is maintained on the transport route to the drawing stage.
In contrast, it is the objective of the invention to create an arrangement for the feeding of sheet-metal blanks to the first machining stage of a transfer press, by means of which, in the course of the feeding, the orienting of each sheet-metal blank takes place and is maintained. In this case, special value is placed on the separation of the orienting movements. For the alignment of the sheet-metal blanks in the direction of the passage through the press, the movement of the sheet-metal blank in this direction is to be utilized, and for an alignment of the sheet-metal blanks transversely to the direction of the passage through the press, the closing movement of the gripper rails is to be utilized.
In the case of arrangements of this type, the objective is achieved by the fact that two intermediate depositing stations are provided before the drawing stage, of which the first intermediate depositing station is developed as the aligning station for the sheet-metal blanks with respect to the first machining station, having fixed and possibly movable stopping means for the alignment of the sheet-metal blanks at least in the direciton of the passage through the press, and that the transfer rails are extended and can be guided into the area of the first intermediate depositing station in this way and in it in each case have passive gripping tools for reaching under the sheet-metal blanks during the transfer and for depositing said sheet-metal blanks in the second intermediate depositing station, and active gripping tools for taking the sheet-metal blanks out of the second intermediate depositi
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Crane Daniel C.
L. Schuler GmbH
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