The invention discloses a
deep hole punching method, which comprises the following steps of (1) heating a steel
ingot; (2) discharging a
forging blank, wherein the
cutting amount of the head end is equal to the 16-20% of the weight of the steel
ingot, and the
cutting amount of the
tail end is equal to the 8-12% of the weight of the steel
ingot; (3) upsetting and drawing the
forging blank, wherein the
forging blank is upset and drawn to form a forging; (4) performing primary
punching, wherein the press-down amount of a punch head is equal to 30% of the depth of a finished hole; (5) performing secondary
punching, wherein the end of the punch head is applied with combustible matter and then is pressed down; (6) performing third punching, wherein the end of the punch head is applied with the combustible matter and then is pressed down; (7) trimming a hole; (8) performing heat treatment after forging. A
deep hole punch head comprises a punch rod, wherein the punch rod is a cylindrical rod, the front end of the punch rod is a semispherical end, and a finishing ring is arranged on the punch rod, and is separated from the semispherical end. The
deep hole punching method has the advantages that the production efficiency is high, the internal tissues are uniform and dense, and the
utilization rate of materials is high. The deep hole punch head has the advantages that the structure design is skillful, the hole forming accuracy is high, and the quality is high.