Boots – shoes – and leggings
Patent
1985-08-22
1987-07-21
Harkcom, Gary V.
Boots, shoes, and leggings
364149, 364476, 364478, G05B 1942, G06F 1546
Patent
active
046822801
DESCRIPTION:
BRIEF SUMMARY
This invention relates to simulation arrangement for determining desired values for the transport of workpieces and the dependent adjusting quantities, such as the gripper movement and the tool automation, of a multistage press.
Multistage presses are used for the forming of sheet-metal strips or sheet-metal blanks to obtain preforms using a plurality of tools. The transport of the sheet to the first machining stage, the transport of workpieces between the machining stages and possibly the delivery of the workpieces by the press takes place by means of press-driven transfer rails or, in the case of an external drive, by means of transfer rails whose movements will then be controlled by the press. The transfer rails carry gripping tools that are adapted to the dimensions of the workpiece of which at least the gripping tool or the pair of gripping tools for the transport from the preliminary stage, the centering stage or similar stage in a controllable manner is developed to have an active effect.
When adjusting the multistage press for another workpiece, the tools and gripping devices must be exchanged. The adjustment of tools and gripping devices, the adapting of gripping devices in the case of workpieces that were newly included in the manufacturing program as well as the adjustments of the transport movements of the transfer rails in general that depend on the tool change and must be carried out again in each case, with respect to kinetic quantities and extent of movement, to speed and acceleration, are very time-consuming and connected with a correspondingly long period of stoppage of the multistage press. Because of the very high procurement costs, the cost effectiveness of multistage presses in particular is based on a high yield rate, i.e., a high degree of utilization.
In order to decrease periods of stoppage it is known to set up the tools on tables that can be moved out of the operating range of the press. However, this does not make it possible to shorten the time periods for setting up the gripping devices and of the workpiece-specific transfer movements. These activities must still be carried out at the press at creep speed. Since, however, these setting-up times make up the largest part of the overall setting-up period, long periods of stoppage of the multistage press will still occur. In addition, there will frequently be, during the trial run, crash situations as a result of errors during assembly and setting-up as well as inattentiveness of the operator which may lead to damage to the tool, the transfer arrangement and the press structure. Also, multiple repetitions of the movements to be adjusted for optimizing the movement quantities of the transfer and of the gripper dimensions and gripper arrangements increase the period of stoppage of the multistage press. During the adjustment, all press stages run in a manner such that access to the tool is limited only with respect to time and the depositing process as well as the removal process in the lower part of the tool can be controlled only to a limited extent.
From DE-OS 24 50 477 it is known to let an additional feeding device engage at the transfer rails, said feeding device taking over the feeding drive of the press which then has to be disconnected. As a result the accessibility to the working area is made possible during the adjustment of the transfer and of the gripping devices. But all adjustments must be made while the press is stopped, and the test runs must be carried out in the press during a time when all driving means are required to be running.
In DE-OS 25 30 261 an arrangement for the painting of parts of a car body is described. This arrangement has an automatic device having a paint spray gun which must be moved manually at a distance from a model while it applies paint to this model covering the surfaces via the contours. The movements and the quantities of paint used during these movements are determined via emitters and are processed in a program for the treatment of duplicate pieces. For this purpose, the arrangement al
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Braitinger Helmut
Feinauer Otto
Schneider Franz
Harkcom Gary V.
L. Schuler GmbH
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