METHOD FOR THE HOT FORGING OF A SEAMLESS HOLLOW BODY OF MATERIAL THAT IS DIFFICULT TO FORM IN PARTICULAR OF STEEL

摘要

The invention relates to a method for the hot forging of a seamless hollow body of material that is difficult to form. It is proposed that the hot forging is performed with a degree of forming with respect to the cross section to be formed in the forging section with ln(AO/A1) of less than 1.5 and a method related form changing rate of less than 5/s where AO is defined as the local cross sectional area of a hollow body to be forged in m and A1 is defined as a local cross sectional area of the finished hollow body in m and the form changing rate is defined as the maximum rate of the hollow body to be forged in m/s with respect to the outside diameter of the finished forged hollow body in m.