We just made such a set of molds. The mold consists of an upper mold and a lower mold. The upper die is a punch, and the external dimension of the punch is the groove dimension of your U-shaped product, which needs to be mapped. The lower die is a female die, the mating gap between the female die and the male die is 3mm, and a spring block is installed in the middle of the female die, and the product is pushed out by the spring force after being pressed. The mold is installed on a hydraulic press and molded by an oil cylinder.