| 摘要 |
In a method of forming an extrusion die by forming an extrusion aperture 11 in a die piece 10, forcing a flowable material 14 at least partly through the extrusion aperture so that the leading surface 16 of the material becomes deformed in the extrusion direction, and then reshaping the die piece in such a manner that the axial bearing depth of the extrusion aperture at any location around its periphery corresponds to the deformation of the leading surface of the flowable material at that location, as an additional step, before or after the reshaping, the axial bearing depth of the aperture 11, at locations around its periphery, is adjusted for example by machining one surface of the die piece, by amounts dependent on the distance of said locations from the centre of the die piece. |
