JPS63108913A - Twist correction device for electric welded tube formed stock - Google Patents

Abstract

PURPOSE:To automatically prevent and correct twists by detecting a axis deviation amount by a detector installed in front of a breakdown mill and moving a formed stock by a distance corresponding to the detected amount by use of a movable side guide. CONSTITUTION:For a tube manufacturing device consisting of zones such as a breakdown forming A, intermediate forming B, fin pass forming C, and squeeze forming D in a series, a axis deviation detector 7, movable side guide 6, and fixed side guide 5 are installed in front of the zone A. An axis deviation amount of a formed stock 4 is detected by the detector 7 and the measured result is inputted to the guide 6 to correct the deviation. Thus, the productivity of the tube manufacturing work is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a device for correcting twisting of a molded material in the manufacture of electric resistance welded pipes.

(Prior art) Generally, the forming of an electric resistance welded tube consists of breakdown forming (A), intermediate forming (B), fin bath forming (C), squeeze forming (D), etc., as shown in the plan view of Fig. 10. ing.

11 to 14 show each piece of breakdown molding, FIG. 2 shows intermediate molding, and FIG. 3 shows fin bath molding. In forming an electric resistance welded tube, the molding material 4 is properly engaged in the shape of the forming hole by restraining the upper and lower rolls in the breakdown and restraining the fins in the fin bath. The pipe size of conventional molded materials (usually expressed as the relationship between plate thickness and pipe diameter, that is, t/D) is t
If /D<H, the conventional method shown in FIG. 1O will solve the problem.

(Problems to be Solved by the Invention) In recent years, with the remarkable improvement in electric resistance welded pipe manufacturing technology, high quality and thick pipe steel pipes for pipelines have come to be manufactured.

In response to this situation, it is difficult to prevent and correct twisting of the formed material especially in the intermediate forming zone when the formed material is restrained only by conventional rolls, especially when forming pipes with a large thickness such as t/D > 896. Productivity is significantly reduced as it takes a long time to process the board. In addition to the cage roll type described in FIG. 2, there are cluster roll types and the like as intermediate forming methods, but they have essentially the same problem regarding the one return of the forming material.

The conventional problems are detailed below. FIG. 4 shows the molding state when the plate thickness is thin.

Molded material 4 sandwiched between upper horizontal roll 1 and lower horizontal roll 3
As shown in Figure 4, it is in wide contact with the roll and is stable without moving left or right.

However, when the plate is thick, on the other hand, the upper horizontal roll 1
The contact state between the lower horizontal roll 3 and the molded material 4 is three-point contact. In this case, it is important that the molding material passes symmetrically to the core of the roll. In other words, if the molded material enters asymmetrically with respect to the roll core (if this occurs, the molded material will increasingly move in the left-right direction due to the unbalance of force in the three-point contact and the difference in the circumferential speed of the roll at the contact position). In order to prevent this, the molding material 4 is
Even though the molding material 4 is symmetrical (dimension 8 in the figure) with respect to the core of the upper and lower horizontal rolls 1 and 3, twisting will become a problem if the molding material 4 is not caught in the breakdown molding. Further, when the molded material 4 is displaced as shown in Fig. 7 (dimensions a and 5 in the figure), it must be corrected.

(Means for Solving the Problems) The present invention solves the above-mentioned problems, and its gist is that in forming an ERW tube, a misalignment detection device, a movable side guide and a This is a twist correction device for an electric resistance welded tube formed material, which is provided with a fixed side guide.

(Function) The device of the present invention detects the amount of misalignment of the molded material using the misalignment detection device disposed in front of the breakdown molding zone,
Based on the detected amount of misalignment, the movable side guide moves the molded material to automatically prevent and correct twisting of the molded material.

(Example) The present invention will be explained in detail based on the example shown in FIGS. 1 to 9.

In FIG. 1, in the pipe manufacturing equipment in which breakdown forming zones A, intermediate forming B, fin bath forming C, and squeeze forming zones are arranged in a row, a misalignment detection device 7, a movable side guide 6, and a A fixed side guide 5 is provided.

That is, in the apparatus of the present invention, a fixed side guide 5, a movable side guide, and a misalignment detection device 7 for detecting misalignment of the molded material are arranged on the front surface of the mill for breakdown molding.

The fixed side guide 5 is centered according to the width of the plate so that the molded material 4 is aligned with the core.

Then, the amount of misalignment is measured by a misalignment detection device 7 for detecting misalignment of the molded material 4 shown in FIG. A device for detecting the positions of both side surfaces of the molded material 4 using an image sensor, for example, as the detection device 7, and measuring misalignment is provided. This measurement result (H) is corrected by inserting the movable side guide 6. In this modification, as shown in FIG. 9, guide rolls 8. Operate to lO.

This operation moves the guide roll 8 to the right (-), and also moves the guide roll 1o to the right by (H) for centering.

In FIG. 9, an amount of oil equivalent to the misalignment is sent or released from the hydraulic system to the hydraulic cylinder.

(Effects of the Invention) As described above, the device of the present invention detects the amount of misalignment using the detection device installed in the front of the breakdown mill, and uses the movable side guide to compensate for this amount by moving the forming material. It has an excellent function that significantly improves the productivity of pipe making work by automatically preventing and correcting the twisting of materials.

[Brief Description of the Drawings] Fig. 1 is a diagram showing the layout of equipment in an apparatus according to an embodiment of the present invention, Fig. 2 is a diagram showing intermediate forming of the ERW pipe manufacturing equipment, and Fig. 3 is a diagram showing the fin bath forming of the same. Figure 4 is a diagram showing the contact situation between the forming material and the roll when the plate thickness is thin, Figure 5
The figure shows the contact situation between the forming material and the roll when the plate thickness is thick, Figure 6 shows the normal state of the forming material and the core of the roll, and Figure 7 shows the state where the forming material has misaligned. 8 is an explanatory diagram of the misalignment detection device, FIG. 9 is an explanatory diagram of the misalignment correction device, FIG. 10 is a diagram showing the layout of the ERW pipe making equipment, 12, 13, and 14 are explanatory diagrams of breakdown molding. 1... Upper horizontal roll 3... Lower horizontal roll 4.
・Molding material 5 ・Fixed side guide 6 ・
・・Movable side guide 7 ・Center misalignment detection device 8 ・・
・Guide roll IO... Guide roll Figure 3 Figure 2 ■ = Upper horizontal roll 3: Lower horizontal roll 4: Molded material Figure 8 Figure 9 4: Molded material 7: Center misalignment detection device 8, guide roll 10 NIGAITROLL Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 Procedural amendment (Horiki Showa 12th year 1nto day ゛Showa 1st year patent conduit No. 2, 22, food 3 No. 4, agent address: Chiyoda-ku, Tokyo) 2-6-2 Marunouchi, Shigesu Building 3305, date of amendment order, near day 8, January 1962, contents of amendment as shown in the attached document. The following matters in the specification of the application are amended. Note 1. On page 7, lines 6-7, the words "Figures 11 and 12" are corrected to "Figures 11 and 12."

Claims (1)

[Claims] A twist correction device for an ERW tube forming material, which includes a misalignment detection device, a movable side guide, and a fixed side guide arranged in front of a breakdown molding zone in forming an ERW tube.