FIELD: piercing processes for making seamless pipes.
SUBSTANCE: method comprises steps of providing feed angle β and interaxial angle γ of main rolls in range determined according to expressions: 8° ≤ β ≤20°; 15°≤ β + γ ≤ 50°; setting relation of outer diameter do of solid blank with outer diameter d and thickness t of wall of hollow rolled piece after piercing according to expression: 1.5 ≤ - Ψr/Ψθ≤ 4.5 where Ψr =ln(2 t/do) and Ψθ = ln{2(d - t)/do}; setting relation of inlet diameter D1 and outlet diameter D2 of main rolls with said do, d and γ according to expression: (d/do)/(0.75 + 0.025γ) ≤ D2/D1.
EFFECT: possibility for suppressing effects of rotary forging and excess shear deformation without excess narrowing of roll diameter.
3 cl, 6 dwg, 2 ex, 2 tbl
Title | Year | Author | Number |
---|---|---|---|
METHOD OF SEAMLESS METAL PIPE MANUFACTURING | 2015 |
|
RU2656901C2 |
METHOD FOR FORMING SEAMLESS TUBE | 2004 |
|
RU2307716C2 |
METHOD OF ROLLING SLEEVES AT DISK MILL | 2010 |
|
RU2440202C1 |
SLEEVE PRODUCTION METHOD | 2003 |
|
RU2245751C1 |
METHOD OF CONTINUOUS HELICAL ROLLING | 1990 |
|
RU2013144C1 |
METHOD OF SEAMLESS TUBE PRODUCTION | 2011 |
|
RU2455092C1 |
METHOD OF PRODUCING SEAMLESS TUBES | 2009 |
|
RU2400317C1 |
METHOD FOR MAKING SEAMLESS TUBES BY PILGER AND HELICAL ROLLING | 1995 |
|
RU2139154C1 |
METHOD OF PRODUCING SLEEVES | 2015 |
|
RU2614231C1 |
UNIT FOR PRODUCTION OF HOLLOW PIECES | 1995 |
|
RU2098205C1 |
Authors
Dates
2007-11-10—Published
2004-06-03—Filed