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Non-standard pass system

A pass type, non-standard technology, applied in the direction of metal rolling, etc., can solve the problems of not being able to produce thick-walled pipes, not being able to meet the diversification of product varieties, multiple specifications, and not being universal

Active Publication Date: 2021-04-02
HEILONGJIANG JIANLONG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When producing thin-walled pipes, in consideration of avoiding the defects of "green lines" and "nail prints" on the outer surface, an elliptical hole system is adopted, but the specifications of thick-walled pipes cannot be produced. When producing thick-walled pipes, "inner hexagons" appear on the inner surface of the steel pipe Defects, and the rolling load of the motor is high; when producing thick-walled pipes, avoid the "inner hexagonal" defect of the inner surface quality of the steel pipe, and adopt a round hole system, but when producing thin-walled pipes, the outer surface of the steel pipe is prone to "green lines" and "nails" "print" defects, so the two pass systems cannot be used in common, and cannot meet the current product variety and specifications, and the production cost of the enterprise is high

Method used

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Embodiment 1

[0011] refer to figure 1 and figure 2 , a non-standard pass system, the non-standard pass is composed of three arc segments, which are segmented arc R1, segmented arc R2, segmented arc R1 and segmented arc R2 The transitional arc between them; the segmented arc R1 adopts a circular hole type, and the segmented arc R2 adopts an elliptical hole type.

[0012] Segmented circular arc R1: When rolling thick-walled pipes, the amount of expansion is small, and considering the appearance of "inner hexagonal" defects in the inner surface quality of steel pipes, R1 adopts a round pass type. Segmented arc R2: When rolling thin-walled tubes, the amount of expansion is relatively large, and in order to avoid defects such as "green lines" and "nail marks" on the outer surface of the steel tube, the R2 arc adopts an elliptical hole type; and the R1 and R2 circles There is a smooth transition between arcs.

[0013] In order to solve the defects of "green line", "nail print" and "inner hex...

Embodiment 2

[0016] A design method of a non-standard pass system, said design method comprising the following steps:

[0017] The first step, according to the principle of "steel rolling temperature", when distributing the diameter reduction rate, adopt the concept of rolling load forward for design;

[0018] The second step is to calculate the deformation resistance according to the wall thickness of the steel pipe and the corresponding steel grade, so as to allocate the arc lengths of the segmented arcs R1 and R2;

[0019] In the third step, when calculating the arc of the side wall, considering the metal with poor outer surface quality and plasticity, the value of the expansion coefficient is between 0.988 and 0.991.

[0020] Embodiment two

[0021] A method for designing a production process of a non-standard pass system, the method for designing a production process comprises the following steps:

[0022] Step 1. The basic formula of pass design:

[0023] Hole diameter: d=a+b

[...

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Abstract

The invention belongs to the technical field of steel production, and particularly relates to a non-standard pass system which is composed of three arc sections, namely a sectioned arc R1, a sectionedarc R2 and a transition arc between the sectioned arc R1 and the sectioned arc R2, wherein the sectioned arc R1 is in a circular pass, and the sectioned arc R2 is in an oval pass. The pass system isredesigned by combining the outer surface quality advantage of the oval pass without 'cyan lines' and 'nail marks' and the inner surface quality advantage of the circular pass without 'inner hexagon',so that the diversified requirements of the market are met, and meanwhile, the production cost of enterprises is greatly reduced.

Description

Technical field: [0001] The invention belongs to the technical field of iron and steel production, and in particular relates to a non-standard pass system. Background technique: [0002] Tension reducing machine (hereinafter referred to as: tension reducing machine) is an important process in the steel pipe production industry. It is a continuous rolling process of diameter reduction and wall reduction of hollow steel pipes without mandrels. Usually, the stretching and reducing machine requires a large amount of diameter reduction and wall reduction to achieve the purpose of producing multiple specifications and varieties with large-scale blank tubes. Therefore, the number of working frames is large, which can be called the largest rolling equipment. However, under the premise of the current economic market, my country's seamless steel pipes are still only in the production and design of standard specifications. Regarding the different requirements of different users for ste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B19/10
CPCB21B19/10
Inventor 戴诗浩周玉涛张小峰汤智涛董家祥
Owner HEILONGJIANG JIANLONG IRON & STEEL