Patent ID: 8186196
Filing Date: 2012-05-29
Classification: B21D,Y10T

Abstract:
1. A method of lubricating a tool and a workpiece at cutting and forming, from a flat strip, comprising: wetting a surface of the flat strip with a cutting oil film; clamping the flat strip between an upper part comprising a shearing punch, a pressure pad for the shearing punch, a V-shaped projection positioned on the pressure pad and an upper ejector, and a lower part comprising a cutting die, a lower ejector and an inner form punch; pressing out cutting oil from the cutting oil film by operation of the pressure pad, the shearing punch, the upper ejector, the cutting die, the lower ejector and the inner form punch so as to force the cutting oil into chamfers at the pressure pad and into lubrication bore reliefs in the ejector in which the cutting oil is temporarily stored as a stocked up cutting oil; accumulating a quantity of accumulated cutting oil from the stocked up cutting oil in a micro-surface structure of each of respective functional surfaces of the shearing punch and the cutting die; evenly distributing on the functional surfaces a quasi-stationary cutting oil film formed from the quantity of accumulated cutting oil and resulting from movement of the functional surfaces past each other during cutting of the workpiece; and providing said quantity of accumulated cutting oil, via respective effective gaps between the pressure pad and the shearing punch and between the cutting die and the lower ejector, to active surfaces of the shearing punch and the workpiece in a forming zone of the workpiece.