Setting method of super large diameter seamless steel tube straightening roll flattening rate

A seamless steel pipe and super-large diameter technology, which is applied in the field of setting the flattening amount of the super-large diameter seamless steel pipe straightening roll, can solve problems such as unsatisfactory rounding effect, achieve reasonable and uniform pressure, improve ovality, and improve surface quality effect

Active Publication Date: 2020-07-31
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the above-mentioned technical problems of unsatisfactory straightening effect and unsatisfactory rounding effect of the traditional steel pipe multi-roller straightening machine, the present invention provides a high-precision, high-efficiency, easy-to-realize ultra-large-diameter seamless steel pipe straightening roller flattening measurement Setting method

Method used

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  • Setting method of super large diameter seamless steel tube straightening roll flattening rate
  • Setting method of super large diameter seamless steel tube straightening roll flattening rate
  • Setting method of super large diameter seamless steel tube straightening roll flattening rate

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Effect test

Embodiment 1

[0039] The method for determining the flattening amount and distribution ratio of each pair of straightening rollers during the straightening process of large-diameter seamless steel pipe φ530*16 is as follows:

[0040] Firstly, the inner and outer diameter ratio of the steel pipe to be straightened is λ=0.955, the average section radius R=265mm, and the yield strength σ t =345MPa, elastic modulus E=206GPa, Poisson’s ratio μ=0.27 and other relevant parameters input the maximum elastic-plastic flattening amount δ m and the maximum elastic flattening amount δ t Solve the program to obtain the maximum elastoplastic flattening amount δ of the steel pipe m =7.85mm, the maximum elastic crushing amount δ t =6.11mm;

[0041] Then, call the corresponding formula in the maximum allowable flattening amount estimation table of the multi-roller straightening production practice database of steel pipes with different wall thicknesses to obtain the maximum allowable flattening amount of s...

Embodiment 2

[0045] The flattening amount and distribution ratio of each pair of straightening rollers during the straightening process of large-diameter seamless steel pipe φ920*60 are as follows:

[0046] Similarly, firstly, the inner and outer diameter ratio of the steel pipe to be straightened is λ=0.87, the average section radius R=430mm, and the yield strength σ t =785MPa, elastic modulus E=211GPa, Poisson’s ratio μ=0.27 and other relevant parameters input the maximum elastic-plastic flattening amount δ m and the maximum elastic flattening amount δ t Solve the program to obtain the maximum elastoplastic flattening amount δ of the steel pipe m =14.69mm, and the maximum elastic crushing amount δ t =9.82mm;

[0047] Then, call the corresponding formula in the maximum allowable flattening amount estimation table of the multi-roller straightening production practice database of steel pipes with different wall thicknesses to obtain the maximum allowable flattening amount of steel pipes ...

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Abstract

The invention belongs to the technical field of seamless steel tube multi-roll straightening, and specifically relates to a setting method of super large diameter seamless steel tube straightening roll flattening rate. The method comprises the following steps: solving maximal elastic-plastic flattening rate delta m and maximal elastic flattening rate delta t of a steel tube; according to a corresponding relation between wall thickness and the maximal allowed flattening rate of the steel tube, solving the maximal allowed flattening rate delta a of the steel tube; comparing the maximal elastic-plastic flattening rate delta m with the maximal allowed flattening rate delta a, taking a smaller value of the delta m and the delta a as flattening rate delta 2 of an intermediate roll, wherein flattening rate delta 1 of an entrance roll is equal to k1 delta 2, and flattening rate delta 3 of an exit roll is equal to k2 delta 2; according to a principle of satisfying actual flattening rate of a thin wall tube and a thick wall tube, determining actual flattening rate of each pair of straightening rolls, and realizing an aim of differentiated adjustment for straightening roll flattening rate bymeans of a pressing down system. The method, by setting the straightening roll flattening rate, can effectively improve ovality of the straightened steel tube and improve product straightening precision. The method is used for setting straightening roll flattening rate.

Description

technical field [0001] The invention belongs to the technical field of multi-roller straightening of seamless steel pipes, and in particular relates to a method for setting the flattening amount of straightening rollers of super-large-diameter seamless steel pipes. Background technique [0002] Large-diameter seamless steel pipe is an extremely important fluid transportation channel in daily life. Therefore, there is a large demand in industries such as South-to-North Water Diversion and oil and gas transportation. In addition, due to its good load-bearing performance, large-diameter seamless steel pipes are also widely used in the field of urban infrastructure construction, such as the main body of bridges. After heat treatment, seamless steel pipes will inevitably be bent and deformed due to the influence of thermal stress and structural stress, which will affect product quality, especially API standard oil casings, oil and gas pipes, and special pipes for mechanical equip...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D3/02
CPCB21D3/02
Inventor 马立峰王清华马自勇马立东
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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