CN-115768572-B - Method for predicting roundness of steel pipe, method for controlling roundness of steel pipe, method for manufacturing steel pipe, method for generating model for predicting roundness of steel pipe, and device for predicting roundness of steel pipe

CN115768572BCN 115768572 BCN115768572 BCN 115768572BCN-115768572-B

Abstract

The method for predicting the roundness of a steel pipe according to the present invention comprises the step of predicting the roundness of the steel pipe after a pipe expansion process using a roundness prediction model obtained by learning using machine learning, wherein the roundness prediction model includes one or more parameters selected from attribute information of a steel plate, one or more parameters selected from operation parameters of a bending process, and one or more parameters selected from operation parameters of a joint gap reduction process as input data, and roundness information of the steel pipe after the pipe expansion process as output data.

Inventors

Introduction to Japan
HORIE MASAYUKI
Gao yuixiong

Assignees

杰富意钢铁株式会社

Dates

Publication Date: 20260505
Application Date: 20210604
Priority Date: 20200710

Claims (10)

1. A roundness control method for a steel pipe, which uses a method for predicting the roundness of a steel pipe after a pipe expansion step in a steel pipe manufacturing step, The steel pipe manufacturing process includes a press bending process for forming a steel plate into a U-shaped cross-section formed body by a plurality of presses of a punch, a joint gap reducing process for reducing joint gap portions of the U-shaped cross-section formed body to form an open pipe, a welding process for joining end portions of the open pipe to each other, and a pipe expanding process for expanding an inner diameter of a steel pipe formed by joining end portions to each other, The roundness prediction method of the steel pipe comprises the following steps: Predicting the roundness of the steel pipe after the pipe expanding process using a roundness prediction model learned by machine learning, the roundness prediction model including one or more parameters selected from attribute information of the steel plate, one or more parameters selected from operation parameters of the bending process, and one or more parameters selected from operation parameters of the joint gap reducing process as input data, and roundness information of the steel pipe after the pipe expanding process as output data, The roundness control method of the steel pipe includes the steps of predicting the roundness of the steel pipe after the pipe expansion process using actual parameters of attribute information of the steel plate and set values of operation parameters in a downstream process including the press bending process before the start of the press bending process, and resetting the operation parameters of the press bending process so that the roundness of the steel pipe after the pipe expansion process becomes smaller.
2. A roundness control method for a steel pipe, which uses a method for predicting the roundness of a steel pipe after a pipe expansion step in a steel pipe manufacturing step, The steel pipe manufacturing process includes a press bending process for forming a steel plate into a U-shaped cross-section formed body by a plurality of presses of a punch, a joint gap reducing process for reducing joint gap portions of the U-shaped cross-section formed body to form an open pipe, a welding process for joining end portions of the open pipe to each other, and a pipe expanding process for expanding an inner diameter of a steel pipe formed by joining end portions to each other, The roundness prediction method of the steel pipe comprises the following steps: Predicting the roundness of the steel pipe after the pipe expanding process using a roundness prediction model learned by machine learning, the roundness prediction model including one or more parameters selected from attribute information of the steel plate, one or more parameters selected from operation parameters of the bending process, and one or more parameters selected from operation parameters of the joint gap reducing process as input data, and roundness information of the steel pipe after the pipe expanding process as output data, The roundness control method for a steel pipe includes the steps of predicting the roundness of the steel pipe after the pipe expanding process using the roundness prediction method for the steel pipe, and resetting the operation parameters of the pipe expanding process so as to reduce the roundness of the steel pipe after the pipe expanding process using the actual data of the attribute information of the steel plate, the actual data of the operation parameters of the bending process, and the set values of the operation parameters in the downstream process including the pipe expanding process after the bending process and before the start of the pipe expanding process.
3. A roundness control method for a steel pipe, which uses a method for predicting the roundness of a steel pipe after a pipe expansion step in a steel pipe manufacturing step, The steel pipe manufacturing process includes a press bending process for forming a steel plate into a U-shaped cross-section formed body by a plurality of presses of a punch, a joint gap reducing process for reducing joint gap portions of the U-shaped cross-section formed body to form an open pipe, a welding process for joining end portions of the open pipe to each other, and a pipe expanding process for expanding an inner diameter of a steel pipe formed by joining end portions to each other, The roundness prediction method of the steel pipe comprises the following steps: Predicting the roundness of the steel pipe after the pipe expanding process using a roundness prediction model learned by machine learning, the roundness prediction model including one or more parameters selected from attribute information of the steel plate, one or more parameters selected from operation parameters of the bending process, and one or more parameters selected from operation parameters of the joint gap reducing process as input data, and roundness information of the steel pipe after the pipe expanding process as output data, The roundness control method for a steel pipe includes the steps of predicting roundness information of the steel pipe after a pipe expansion process before starting a resetting target process selected from an end bending process, a joint gap reduction process, and a pipe expansion process, and resetting at least one or more selected from the operation parameters of the resetting target process or one or more selected from the operation parameters of a forming process downstream of the resetting target process, based on the predicted roundness information of the steel pipe, using the roundness prediction method for the steel pipe.
4. A roundness control method of a steel pipe according to any one of claims 1 to 3, wherein, The roundness prediction model includes one or more operation parameters selected from the operation parameters of the pipe expanding process as the input data.
5. A roundness control method of a steel pipe according to any one of claims 1 to 3, wherein, The attribute information of the steel sheet includes one or more of a yield stress of the steel sheet, and information representing a sheet thickness and a sheet thickness distribution.
6. A roundness control method of a steel pipe according to any one of claims 1 to 3, wherein, The operation parameters of the press bending process include press position information and press reduction of the punch used in the press bending process to press the steel plate, and the number of press times performed by the press bending process.
7. A roundness control method of a steel pipe according to any one of claims 1 to 3, wherein, The steel pipe manufacturing process includes an end bending process of imparting bending to the widthwise end of the steel sheet before the bending process, and the roundness prediction model includes one or more parameters selected from among operation parameters of the end bending process as the input data.
8. A method for manufacturing a steel pipe, comprising the step of manufacturing a steel pipe using the roundness control method of a steel pipe according to any one of claims 1 to 7.
9. A roundness prediction device for a steel pipe, which predicts the roundness of the steel pipe after a pipe expansion step in a steel pipe manufacturing step, the steel pipe manufacturing step including a press bending step for processing a steel plate into a U-shaped cross-section formed body by a plurality of presses with a punch, a joint gap reduction step for reducing a joint gap portion of the U-shaped cross-section formed body to form an open pipe, a welding step for joining end portions of the open pipe to each other, and a pipe expansion step for expanding an inner diameter of the steel pipe in which the end portions are joined to each other, wherein the roundness prediction device for the steel pipe comprises: an operation parameter obtaining unit that obtains one or more parameters selected from the attribute information of the steel sheet, one or more operation parameters selected from the operation parameters of the bending process, and one or more operation parameters selected from the operation parameters of the seam gap reduction process, and And a roundness prediction unit that predicts roundness information of the steel pipe after the pipe expansion process by inputting the operation parameters acquired by the operation parameter acquisition unit to a roundness prediction model that is learned by machine learning, wherein the roundness prediction model includes, as input data, one or more parameters selected from the attribute information of the steel plate, one or more operation parameters selected from the operation parameters of the bending process, and one or more operation parameters selected from the operation parameters of the joint gap reduction process, and the roundness information of the steel pipe after the pipe expansion process is used as output data.
10. The roundness prediction apparatus of a steel pipe according to claim 9, wherein, The roundness prediction device for a steel pipe is provided with a terminal device provided with an input unit for acquiring input information based on a user operation, and a display unit for displaying the roundness information, The operation parameter acquisition unit updates a part or all of the acquired operation parameters based on the input information acquired by the input unit, The display unit displays the roundness information of the steel pipe predicted by the roundness prediction unit using the updated operation parameter.

Description

Method for predicting roundness of steel pipe, method for controlling roundness of steel pipe, method for manufacturing steel pipe, method for generating model for predicting roundness of steel pipe, and device for predicting roundness of steel pipe Technical Field The present invention relates to a method for predicting the roundness of a steel pipe, a method for controlling the roundness of a steel pipe, a method for producing a model for predicting the roundness of a steel pipe, and a device for predicting the roundness of a steel pipe. Background As a technique for producing a steel pipe having a large diameter and a thick pipe wall, which is used for a pipe line pipe or the like, there is widely used a technique for producing a steel pipe (so-called UOE pipe) by press-forming a steel plate having a predetermined length, width and plate thickness into a U-shape, press-forming the steel plate into an O-shape, welding a butt joint portion to form a steel pipe, and further expanding the diameter (so-called expanded pipe) to improve the roundness. However, in the manufacturing process of UOE steel pipes, a large press pressure is required in the process of forming the steel plate into a U-shape and an O-shape by press working, and therefore, a large-scale press machine is required. In view of this, a technique of reducing the pressing pressure and forming a steel pipe having a large diameter and a thick pipe wall has been proposed. Specifically, a technique is put into practical use in which after bending is applied to the widthwise end portion of a steel sheet (so-called end bending), a formed body having a U-shaped cross section (hereinafter, sometimes referred to as a U-shaped formed body) is formed by a press bending process in which a punch is used to perform a plurality of three-point bending presses, a seam gap reducing process in which a seam gap portion of the formed body having a U-shaped cross section is reduced is further formed into an open pipe, and thereafter, a butt joint portion is welded to form a steel pipe, and finally, a pipe expanding device is inserted into the steel pipe to expand the inner diameter of the steel pipe. Further, as the pipe expanding device, a device is used which includes a plurality of pipe expanding tools having curved surfaces obtained by dividing circular arcs into a plurality of sections, and expands the steel pipe and adjusts the shape of the steel pipe by bringing the curved surfaces of the pipe expanding tools into contact with the inner surface of the steel pipe. In the press bending step, if the number of times of three-point bending press is increased, the roundness of the steel pipe after the pipe expansion step is improved, but a long time is required for forming the steel pipe into a U-shaped cross section. On the other hand, if the number of times of three-point bending press is reduced, the cross-sectional shape of the steel pipe approaches a polygonal shape, and there is a problem that it is difficult to make the steel pipe circular. Therefore, the operation is performed by empirically determining the number of times of three-point bending and pressing (for example, 5 to 13 times for a steel pipe having a diameter of 1200 mm) according to the size of the steel pipe. As for the operation conditions of the press bending step for improving the roundness of the steel pipe after the pipe expanding step, various methods for setting the same have been proposed. For example, patent document 1 describes a method for performing three-point bending press with as few times as possible, and expanding a pipe by bringing a plurality of pipe expanding tools arranged in the circumferential direction of a pipe expanding device into contact with an undeformed portion where deformation due to the three-point bending press does not occur. Patent document 2 describes a method of improving the roundness of a steel pipe after a pipe expanding process by making the radius of curvature of the outer peripheral surface of a punch used for three-point bending press and the radius of curvature of the outer peripheral surface of a pipe expanding tool satisfy a predetermined relational expression. In patent document 3, as a method for manufacturing a steel pipe that can efficiently manufacture a high roundness without requiring an excessive pressing force in the press bending step, there is described a method in which, when three-point bending press is performed, a light-processed portion, to which a very small curvature is imparted compared with other regions, is provided in at least a part of a steel plate, or a non-processed portion, to which bending is omitted, is provided. Patent document 3 describes that, in the seam gap reduction step, a pressing force is applied to a portion separated from the center of the light processed portion or the unprocessed portion by a predetermined distance without restraining the light processed portion or the unprocessed portion. In addition, an