Metal deforming – With cutting – By shearing tool-couple
Reexamination Certificate
1998-08-18
2001-04-10
Crane, Daniel C. (Department: 3725)
Metal deforming
With cutting
By shearing tool-couple
C072S337000
Reexamination Certificate
active
06212930
ABSTRACT:
The invention relates to a method and a device for producing stamped parts, especially plates.
BACKGROUND OF THE INVENTION
Stamped parts, especially plates such as used as clutch plates and brake plates in automatic transmissions, are customarily produced by the following steps: blanking, deburring, straightening and visual checking. In the blanking step the workpiece is blanked out from the raw material. In this step, burrs form in the outer and inner contours. The burrs are removed in the deburring step. In the straightening step, the workpiece is brought to a desired flatness by rolling, for example. The last mentioned method step is the visual checking. In the visual checking, the workpiece is checked for damage such as scratches or dents. Between these individual steps, the workpiece is removed from the respective tool, set in an intermediate position and transported to the next tool. By pretreating the raw material, the method steps can be reduced to blanking, deburring and visual checking. One kind of pretreatment is, for example, stress-relieving annealing. In the known production method, the elevated cost of production and the time taken are disadvantageous.
SUMMARY OF THE INVENTION
The invention solves the problem of reducing the cost of production and the time taken. According to the invention, the problem is solved by a method of production of stamped parts, especially plates, comprising only two steps. In a first step, the workpiece is blanked from raw material by fine blanking in a device and is the moved to a stamping stage by means of transfer tongs also housed in the device. The stamping stage is also inside the device. In the second step, the inner and outer contours of the workpiece are stamped so as to remove the burrs formed in the workpiece during the first step.
The solution, according to the invention, offers the advantage that the workpiece is produced in only one tool. Post-treatment and visual checking are eliminated. Another advantage is that placing in an intermediate position and transport are also eliminated.
In a development hereof, it is proposed that during a working operation in the fine blanking stage a first workpiece be blanked from the raw material and the burrs simultaneously removed in the stamping stage on a second workpiece. In another development of the invention, it is proposed that after terminating a working operation the first workpiece be automatically transported from the fine blanking stage to the stamping stage by means of transfer tongs. The second workpiece is simultaneously removed from the device and the fine blanking stage is equipped with a new raw material.
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Maschinenmarkt, “Stanz Prägen der Bohrungen an Stützplatten ersetzt herkömmliche Verfahren”, by Johann Michael JOST, dated 1982, pp. 899-900.
Industrie, Nr. 26, vol. 29, dated 1985, p. 20.
Fertigung, “Ein guter Schnitt”, dated Mar. 1987, pp. 64,66.
Maschinenmarkt,“Kleinserie rentabel”, dated 1989, p. 34.
Feinschneiden, “Feinschnitteile im Automobilbau”, dated Sep. 1990, pp. 88-90.
Grimm Willy
Skrabs Alfred
Crane Daniel C.
Davis & Bujold P.L.L.C.
ZF Friedrichshafen AG
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