Piercing method for manufacturing of seamless pipe

Details Piercing method for manufacturing of seamless pipe Piercing method for manufacturing of seamless pipe

2006-12-12

2006-12-12

Tolan, Ed (Department: 3725)

Metal deforming

By use of tool acting during relative rotation between tool...

During rotation of work

C072S366200

Reexamination Certificate

active

07146836

ABSTRACT:
A piercing method for manufacturing a seamless pipe capable of suppressing the rotary forging effects and suppressing the redundant shear strain without excessive narrowing of the roll diameter is provided. This method is characterized by holding a feed angle β and a cross angle γ of main rolls in a range satisfying the following expressions (1) to (3), setting the relationship between outer diameter “d0” of the solid billet and the outer diameter “d” and thickness “t” of a hollow piece after piercing so as to satisfy the following expression (4), and further setting the relationship between inlet diameter D1and outlet diameter D2of the main roll with the above-mentioned “d0”, “d” and γ so as to satisfy the following expression (5)in-line-formulae description="In-line Formulae" end="lead"?8°≦β≦20°  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?5°≦γ≦35°  (2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?15°≦β+γ≦50°  (3)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?1.5≦−ψr/ψθ≦4.5  (4)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?(d/d0)/(0.75+0.025γ)≦D2/D1  (5)in-line-formulae description="In-line Formulae" end="tail"?In the expression (4), ψr=1n(2t/d0) and ψθ=1n{2(d−t)/d0}.

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