2020 Volume 61 Issue 712 Pages 124-129
Forging load generally increases for many reasons as compression proceeds. To reduce the forging load, we focused on reducing the contact area with forging dies and proposed a new method using the flexible rocking motion created in coordination with multiple linear actuators. A cylindrical specimen of annealed pure aluminum was upset between flat dies up to half its initial height. Rocking motion was applied to the lower die in the latter half of the compression. The presented method reduced the forging load by up to approximately 50% compared with conventional upsetting. The reduction of load increased with increasing rocking angle and its frequency. The upset specimen was spread more toward the rocking direction and its end face processed with the rocking die was slightly tapered. Lubrication caused sliding of the specimen during rocking even with a small rocking angle.
