Bending rolls, and pipe formed thereby

Details Bending rolls, and pipe formed thereby Bending rolls, and pipe formed thereby

B - Operations, Transporting

21

D

B21D 5/12 (2006.01) B21C 37/08 (2006.01) B21D 5/14 (2006.01)

Patent

CA 2288421

In a pipe forming process using bending rolls the production of high-strength, thick-walled elongated pipes is achieved either by (1) setting the roll spacing L between lower rolls to a value greater than the sum of the diameter Dwu of the upper roll 34 and the diameter Dwl of each of the lower rolls 32, and setting the amount S of tightening of the upper roll 34 with respect to the lower rolls 32 to a value greater than the radius Rwl of each of the plural rolls; or by (2) effecting pipe forming work on the sheet material such that the spacing L of the lower rolls 32 satisfies the following condition: (Dp + Dwl) > L >= (Dwu + Dwl).

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