GB889523A - An improved method of and apparatus for producing scale-free pressings - Google Patents

Abstract

889,523. De-scaling metal blanks. HATEBUR, F. B. Sept. 2, 1960, No. 30320/60. Class 99(2). [Also in Group XXII] In the production of scale-free workpieces pressed from blanks 1 cut from bars, immediately before the introduction into the die of a press the blank to be shaped is moved through a scraping device 11 provided with cutting edges in a plurality of axially consecutive planes, the edges of each plane being offset in relation to those of the other planes over the peripheral line thereof in such a manner that the removal of the layer of scale is effected in the form of fine shavings over a closed circular line. As shown, the device 11 is disposed in a press and comprises a spacing washer 13, an annular tension washer 14, and rings 16 provided with internal cutting edges 15 and between further spacing washers 13. The punch 2 of the press introduces the blank 1 into the die 10 to deform the blank and an ejector bush 3 forces the deformed blank 1<SP>1</SP> upwards through the device 11 to remove scale from the surface 1<SP>11</SP> of the blank 1<SP>1</SP>; burrs formed on the edges 1<SP>111</SP>of the blank are removed by the washer 14 which opens on the passage of the blank 1<SP>1</SP> and then springs inwardly to remove the burr. Ducts 17, 18, 19, 24 and 25 for cooling fluid are provided and circulation of the fluid washes out of the die the particles of scale removed from the blank. In a modification, the blank is passed through a scraping device 11<SP>1</SP>, is deformed, and is then moved through a scraping device 11 to be removed laterally from the press by a slide 22