Metal deforming – With means to drive tool – With means to permit tool positioning
Patent
1998-09-23
2000-05-09
Crane, Daniel C.
Metal deforming
With means to drive tool
With means to permit tool positioning
83571, 72470, B21D 3704, B21D 3714
Patent
active
06058758&
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a press, in particular a precision blanking press, with a press upper part and a press lower part associated with the press upper part, a tool being located between the press upper part and press lower part and a hydraulic plate being arranged between an upper tool and the press upper part and/or a lower tool and the press lower part.
Various forms and designs of presses are commercially available. As a rule, a press punches out a workpiece from a workpiece strip, for example, and the corresponding tool machines it in the press, for example folds it or the like. During the machining of the workpiece, a plurality of tool elements interact, and as a rule each of these is subjected to a specific pressure. As a function of the pressures set there is an interaction of the tool elements in order to machine the workpiece.
This applies especially also to so-called precision blanking devices in which the strips to be punched or the blanks are clamped between a blanking plate and a press plate and a blanking die and a pressure pad, which then move relative to one another. A corresponding precision blanking device is described, for example, in European Patent Application 85 981 05 31.5. In said publication it is apparent that the hydraulic devices for both sides of the press, i.e. for the upper and lower tools are extraordinarily complicated and are fixed for each press, i.e. cannot be changed.
A press of the above-mentioned type is known from DE 43 43 336 A1 as a hydraulic deep drawing device.
The present invention is based on the object of developing a press of the above-mentioned type in which the design of the press and the control, in particular of the activity of the tools, is significantly simplified and configured in a very variable fashion.
This object is achieved by virtue of the fact that the upper and lower hydraulic plates are connected by means of built-in supports to form a piece of additional hydraulic equipment.
Consequently, the upper and lower hydraulic plates are combined to form a unit which can be inserted between, for example, a slide and the press lower part of the press. By means of the built-in supports, the upper and lower hydraulic plates are held apart, so that the hydraulic plates can each be secured separately to the slide and/or press lower part. In order to remove the built-in supports, the slide then merely needs to complete a travel movement, causing the built-in supports to be released.
Furthermore, there is also provision to connect a lower and an upper tool plate to form a tool packet, so that this tool packet can also be handled as a unit. This tool packet is placed as a unit between the two hydraulic plates, clamped tight, and the built-in supports are released by a travel movement of the slide. This means that not only the entire hydraulic device of the press, insofar as it affects the tool, but also the tool device itself can be handled very flexibly. An existing tool or tool module can be exchanged at any time for a different tool packet with other tools. Basically, merely the base frame and the travel device for the slide always remain the same. All the other parts of the press can be exchanged and replaced with other ones.
The chosen hydraulic plate has the advantage that the entire hydraulic system for controlling the tool is no longer fixed in the press itself but instead is separate from the actual press. The hydraulic plate can be exchanged at any time and replaced with another hydraulic plate with a different hydraulic control system. In the preferred exemplary embodiment there is even provision that the hydraulic plate always remains unchanged while the actual hydraulic units can be inserted separately into the hydraulic plate and therefore also exchanged separately. Depending on the working method which is to be carried out on the corresponding press, the hydraulic units can be exchanged and replaced with suitable units. Consideration has been given particularly to the possibility of a plurality of hydraulic units being accommodated one next
REFERENCES:
patent: 3610021 (1971-10-01), Hopper
patent: 3848494 (1974-11-01), Gargrave
patent: 3881343 (1975-05-01), Ducate
patent: 4151736 (1979-05-01), Quaas
patent: 4258620 (1981-03-01), Sallander
patent: 4698894 (1987-10-01), Lingaraju
Crane Daniel C.
Feintool International Holding
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