| 摘要 |
<p>A method of forming a sleeve of circular cross-section from a flat plate of predetermined shape is provided by which in a very simple, reliable and cheap manner a sleeve can be manufactured, the shape of which corresponds with a desired shape without an additional pre- or post process.</p><p>In order to achieve the objects mentioned above a method as mentioned is provided in which the plate is pressed through a shaft enclosing the plate against and along a hollow mould wall having a shape corresponding to the shape of the sleeve to be made.</p><p>Furthermore a device for carrying out the aforesaid method is provided characterized by a gap-shaped shaft, the width of which is smaller than twice the thickness of the plate, the outlet end of said shaft adjoining a fixed, hollow mould wall having a shape matching the shape of the sleeve to be manufactured, whilst at the inlet end it co-operates with means for pressing the plate through the shaft.</p> |
