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| Number | Title | Issue Date |
| 7363791 | Rotary stamping apparatus and method of forming sheet metal A rotary stamping apparatus for forming moving sheet metal and having a die assembly moveable forward and backward along a linear path, with upper and lower dies on respective sides of the sheet metal, the dies being closeable on the sheet metal for forming, and, a ... | 04/29/2008 |
| 7047782 | Method for roll forming, capable of preventing wrinkles and device therefor A die roll 3 comprises a core part 3a which is formed of an elastic material and faces a punch part 2a of a punch roll 2. The core part 3a presses a bottom portion 4b of a drawn portion 4 | 05/23/2006 |
| 7013697 | Method for expanding a tubular blank A method for expanding tubular blanks includes pre-expanding or initially expanding a section of the tube by forcing a punch into an open end of the tube. The punching process may be repeated to achieve up to approximately 50% expansion from the original configurati... | 03/21/2006 |
| 6367684 | Method and device for working a weld on a support sleeve A method for smoothing and compacting a weld on a cylindrical support sleeve includes mounting the support sleeve on an abutment and moving a device across the support sleeve such that a roller on the support sleeve rolls on the weld under pressure so tha... | 04/09/2002 |
| 5765419 | Method and apparatus for a rolling of hollow articles In an impact rolling apparatus the axes of roller heads are arranged substantially perpendicularly relative to the longitudinal axis of the workpiece. Accordingly, a displacing of the material at the workpiece proceeds predominantly tangentially perpendic... | 06/16/1998 |
| 4872250 | Method for fabricating a dished hollow body possessing a linear or helical inner toothing According to the well known Grob method, there is fabricated on a mandrel provided with outer or external toothing or teeth a substantially dished or pot-shaped hollow body with corresponding inner or internal toothing or teeth. This fabrication operation... | 10/10/1989 |
| 4353236 | Machine for flattening the internal bead of welded tubing A machine for removing the internal bead of longitudinal seam welded tubing by flattening includes a mandrel to be positioned within the tubing, an external hammer which includes a vertically oscillating roller which hammers the outside of the tubing oppo... | 10/12/1982 |
| 4331281 | Process and apparatus for production of welded tubes An improved process and apparatus for continuous production of welded tubes is disclosed wherein a metal strip material is formed into a tubular form, the longitudinal edges thereof welded, and the welded seam cold worked by the application of a high freq... | 05/25/1982 |
| 4326398 | Apparatus to equalize in height, by hammering, the line of welding of longitudinally welded tubes An apparatus for flattening the weld bead of longitudinally welded tubes consisting of a hammering mass impacting with a frequency greater than 2500 impacts per minute and an anvil having an elastomer bushing at each end.... | 04/27/1982 |
