High-accuracy blank forming - pressing rollers revolving at same speed and acting on the end face control blank size

摘要

The relative position of the blank and of the forming rollers ensures that the finish attains a high degree of accuracy with a lower subsequent machining allowance and at the same time the range of blanks is extended by comparing with conventional forging methods. The blank (I) is carried by the mandrel (2) and bears against a back-up support (3) when worked by rotating rollers (4, 5). The finished section (A) is guided by die (6), and at the end of operation the shift of support (3) ensures the removal of the blank from the mandrel. The forming can be made with two headstocks, one stationary and the other movable. The spindle of one headstock carries the forming roller while the spindle of the other headstock features an ejector.