Plug for use in piercing mill

Details Plug for use in piercing mill Plug for use in piercing mill

B - Operations, Transporting

21

B

B21B 25/00 (2006.01)

Patent

CA 2631149

A plug has a tip end portion, a taper portion, and a middle portion. The surface of the tip end portion is a spherical surface whose radius of curvature is R1 and length is L1 that is shorter than R1. The outer diameter of the taper portion on the front end side is D1, and the outer diameter on the back end side is D2 that is larger than D1, and the length is L2. The plug satisfies Expression (1), Expression (2) if 0 < L1/R1 < 0.5 and Expression (3) if 0.5<=L1/R1 < 1. The curve of the spherical surface of the tip end portion is gentler than that of the semi-spherical surface, and the diameter of a hole formed in a billet by the tip end portion is larger than that in the case of the semi-spherical surface. Therefore, the taper portion does not contact with the billet. 0.5D1 < L1+L2<=2.5D1 ...(1) 1.0 < D2/D1<=1.4 ...(2) 1.0 < D2/D1 < 1.8-0.8L1/R1 ...(3)

La présente invention concerne un bouchon comprenant une extrémité pointue, une section profilée et une section de tube. L'extrémité pointue possède une surface sphérique ayant un rayon de courbure R1 et une longueur L1 inférieure à R1. La section profilée possède un diamètre extérieur antérieur D1, un diamètre extérieur postérieur D2 supérieur à D1 et une longueur L2. Le bouchon satisfait l'expression (1), l'expression (2) lorsque 0 < L1/R1 < 0,5, et l'expression (3) lorsque 0,5 = L1/R1 < 1. L'extrémité pointue possédant une surface sphérique avec une courbure plus faible qu'une surface hémisphérique, le diamètre du trou formé dans le matériau au niveau de l'extrémité est supérieur à la surface hémisphérique. Ainsi, la section profilée n'entre pas en contact avec le matériau. 0,5 D1 < L1 + L2 = 2,5 D1 (1) 1,0 < D2/D1 = 1,4 (2) 1,0 < D2/D1 < 1,8 -0,8 L1/R1 (3)

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