Arrangement for producing metal stamping comprises: a die comprising a die plate which define the die opening, the platen is provided with a punch which interacts with a pressure pad in the die plate when the punch produces the stamping for producing a stamping from a material strip; and a lifting device adjacent the die opening for lifting the material strip form the die plate.
Method for producing metal stamping in a precision blanking die comprising the steps of: feeding a material strip to a die opening in a die; closing the die to produce a stamping from the material strip wherein the stamping is formed with an upward protruding supporting part and the material strip is formed with a control edge; opening the die; and further feeding the material strip through the die opening wherein the control edge of the material strip contacts the protruding supporting part of the stamping for moving the stamping to a discharge chute.
metal stamping are generally produced today on punching machines in a die comprising an upper and a lower die half, between which a material strip is clamped. Corresponding punches then press the stamping out of the material strip. These metal stamping are ejected when the die is opened.
Problems are posed among other things by the discharge of the metal stamping. This is effected, for example, by blowing out or by means of special removal arrangements. The removal is normally unsorted or requires a great deal of outlay.
In some cases the stamping is also pressed back into the material strip and discharged with the material strip. This pressing back has the disadvantage, however, that the stamping often suffers damage to the functional surfaces.
A method is known from JP 02 046936 A in which two projections are pressed out of a material strip behind the stamping that carry the stamping along to a discharge facility. In a similar manner according to U.S. Pat. No. 2,790,499, a bridge-like opening is pressed out behind the stamping, with the material strip also being raised in this area behind the stamping, and this bridge-like opening carries the stamping along with it to a discharge chute.
The object of the present invention is to develop a method and an arrangement of the above-mentioned type with which the stamping can be discharged simply, in a sorted manner and free from damage.
In one preferred exemplary embodiment, the punch works together with a pressure pad in a die plate. During blanking of the stamping, the stamping is pressed into the die plate against the force of the pressure pad. If the die plate is now removed from the punch, the pressure pad pushes the stamping out of the die plate again so that it preferably comes to rest on the surface of the die plate. The stamping is then pushed along this surface up to the discharge facility by means of the material strip.
In order that the stamping can be brought to the surface of the die plate without interference by the material strip, the material strip has to be raised relative to the die plate. A device is provided for this purpose that determines the position of the material strip relative to the die plate and, if provided, also relative to the press platen in which the punch is guided. A large number of exemplary embodiments can be provided for this device. In one simple exemplary embodiment, the strip guides are used that already hold the material strip between them and guide it through the blanking die according to the prior art. These strip guides are now designed in such a way that they form a receptacle with which it is possible to move the material strip relative to the die plate and/or relative to the press platen. For this purpose it may be advisable that this receptacle can be moved parallel to the punch and/or to the pressure pad.
Raising the material strip to a defined distance from the die plate ensures that the metal stamping can be ejected out of the die plate and lies on the surface of the die plate below the material strip.
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