JPS6233016A - Correcting device for distortion of electric welded tube on intermediate forming zone - Google Patents

Abstract

PURPOSE:To remove distortions and to prevent lowering of yield caused by edge flaw or cutting off faulty part of a material to be formed by detecting one or more pairs of rolls on an intermediate forming zone of electric welded tube by controlling a position independently for distortion of the material to be formed. CONSTITUTION:The material to be formed is bent in the shape of U by a pair of breakdown rolls 7 and deformed gradually in a circular section by width the intermediate forming rolls 10, 14, 20, 24 by space controlling device 11 for rolls of supporting frame 13 of an intermediate roll stand 8. Then, it is deformed in the shape of circular section disconnected its upper part by a pair of fin-pass rolls 16 to send out. Here, the distortion of moving material 1 to be worked is detected by detectors D1, D2 and D3, D4, movable rolls 14, 24 are driven by driving actuators 15, 25 to change its angle of inclination to put the distortion back in normal conditions. In this way, the lowering in yield of products caused by the edge flaws of the material 1 by the distortion and by cutting off the faulty parts of material 1 by the distortion are prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a twist correction device in an intermediate forming zone of electric resistance welded pipe forming equipment.

(Prior Art) Generally speaking, the forming process in electric resistance welded pipe manufacturing equipment consists of composition forming using breakdown rolls.

FIG. 3 shows breakdown forming, in which the material to be formed 1 is roughly formed by being restrained by upper and lower rolls R1+R2.

FIG. 4 shows 40-rule type fin pass forming, in which the material to be formed 1 is.

Shaping is performed by restraint by a finned roll FR and three pressure rolls R3 to R5.

Further, intermediate molding is performed between the breakdown molding and fin pass molding, and a cluster type or cage type molding method is generally used for this intermediate molding.

The role of this intermediate forming is to introduce the material to be formed, which has been roughly formed by breakdown forming, into the fin pass stand while partially forming it, and plays an important role in forming.

In the cluster type forming method used in intermediate forming, the material to be formed L is the left and right rolls R6, as shown in FIG.

The material to be formed 1 is formed by three rolls Re, R9°Ro.

However, the molding methods used for these intermediate moldings have the following drawbacks.

In other words, in both breakdown and fin pass forming, the material to be formed is restrained by rolls,
This prevents twisting of the material to be formed due to the shape, thickness difference, difference in tube manufacturing balance, etc., but this is not the case in medium 1!1 molding.

The deterrent function against twisting is extremely weak.

As a means to solve this problem, for example, as shown in Fig. 7, a method is provided in which flange rolls Ru and R12 are provided to restrain the to-be-formed material that is twisted by the lower roll R8 at a certain position, and to hold it down so that it does not get rolled any further. It has also been taken. (For example, German patent 1016B75゜Figure 8 (a), (b)
shows an example of molding in a conventional intermediate molding zone.
After the material to be formed 1 is formed by the breakdown roll 2,
It passes through a group of rolls consisting of an intermediate forming roll 3 and a bottom roll 4, and is introduced into the fin pass roll 5, and the twisting that occurs during this intermediate forming process is shown in Fig. 7. In the case where the material to be formed is restrained by the flange presser roll 6 as shown in FIG. The edges of the rolls may be rubbed and damaged, causing serious defects in the electric resistance welding section, and the life of the rolls will also be shortened, making this method not a sufficient solution.

When this twisting occurs, the line usually has to be stopped for a long time to cut the material to be formed or to adjust various parts of the intermediate forming equipment, resulting in a drop in yield and a significant drop in line operating rate. Forced.

(Problems to be Solved by the Invention) The present invention provides a twist correction device for a material to be formed in an intermediate forming zone, which eliminates the drawbacks of the conventional intermediate forming described above.

(Means for Solving the Problems) The present invention provides one or more pairs of rolls among a group of forming rolls in an intermediate forming zone as movable rolls whose position can be adjusted independently with respect to the material to be formed. During the forming process with a group of forming rolls, the torsion of the material to be formed is detected,
The present invention is a twist correction device in an intermediate forming zone of an electric resistance welded tube, which adjusts the position of a movable roll according to the twist to apply a rotational moment for twist correction to a material to be formed.

In other words, if there is any sign of twisting in the material to be formed in the intermediate forming zone, this will cause a difference in the contact position of the material to be formed between the pair of intermediate forming rolls, so this difference can be promptly detected during the intermediate forming process. The position of the movable roll is adjusted according to the degree of the difference in the lever, and the twist is eliminated by applying a rotational moment for twist correction to the material to be formed.

In the present invention, it is also considered that the number of movable rolls ranges from a single pair to all intermediate forming rolls in order to improve the efficiency of imparting rotational moment.

Furthermore, there are various possible ways to adjust the position of the movable rolls in order to apply a rotational moment for torsion correction to the material to be formed. (1) Only one of the pair of opposing movable rolls is changed in position.

■ Push out only one movable roll.

(Narrow the roll spacing) ■Only one movable roll can be retracted.

(Increase the roll spacing) (2) Changing the positions of a pair of opposing movable rolls.

■ Push out one movable roll without changing the roll interval,
The other movable roll can be retracted.

etc. can be said to be common.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

7 is a breakdown roll for rough forming, 8 is an intermediate forming roll stand, and an elevating device 9 allows Δ14-/? 1
1-1. ...-One Bird n, fllJhkJ, ζWrEhi-ws*, ijm Extrusion 1111m-11° At the center of the stand 8, a bottom roll 12 is provided which supports the material to be formed l and forms a transport path for it. Support frames +3A and 13B for the intermediate forming rolls are disposed across the transfer path so as to be movable forward and backward with respect to the transfer path. Adjustable inclination angle of 0 intermediate forming rolls IOA, IOB
, 20A and 20B are arranged, and together with the bottom roll 12, an intermediate forming roll group is formed. Therefore, this intermediate forming roll group includes the support frame 13A,
Changes in size can be handled by changing the roll interval by moving 13B forward and backward, and by changing the inclination angle θ. Note that IIA and IIB are support frames 13A and 13.
This is a roll spacing adjustment device that operates B.

Two pairs of movable rolls 14A, 14B and 24A, 24B are provided in this intermediate forming roll group. Each of these movable rolls has a drive actuator +5
A, 15B and 25A, 25B are connected, and each of these movable rolls can independently move forward and backward with respect to the transfer path (material 1).

These movable rolls 14A, 14B and intermediate forming roll 10A
.

10B and between the movable rolls 24A, 24B and the intermediate forming rolls 20A, 20B.
~D4 are provided, and among these, the torsion detectors D1 and D2 on the front stage side are for detecting, for example, the material edge height of the material to be formed 1 after the intermediate forming rolls IOA and IOB,
The torsion is detected by the difference between the detection values of these two torsion detectors, D2. Also, the torsion detector D3 on the rear stage side. D detects the twist of the material to be formed after the opening forming rolls 2OA and 20B. 1B is a fin pass roll.

In this way, the material to be formed 1 is roughly formed by the breakdown rolls 7 and reaches the intermediate forming roll stand 8. The height of this intermediate roll stand 8 is adjusted in advance by a lifting device 9 according to the size, and support frames 13A, 13B on this intermediate roll stand 8, 11A, 11B, and 11A, 11B.
By adjusting the support frame 13A,
The roll interval and inclination angle θ of each pair in the plurality of pairs of intermediate forming rolls arranged on 13B are adjusted.

The material to be formed l inserted through this intermediate forming roll stand 8
In the process of gradually forming into a tube shape by a group of intermediate forming rolls, the intermediate forming rolls! Torsion detectors Dl and D2 installed between OA, 108 and movable rolls +4A, 14B
However, when the torsion of the material to be formed 1 after the intermediate forming rolls IOA and 10B is detected, for example, when the contact position on the intermediate forming roll 14A side is high and the contact position on the intermediate forming roll 14B side is low in FIG. 5, for example, actuate the drive actuator 15B to move the movable roll 14B forward from the normal position, and actuate the drive actuator 15A to move the movable roll 14A back from the normal position to release the restraint, thereby causing the material to be formed to move against the material l. A force F is generated and a rotational moment M for twist correction is applied, and these movable rolls 1
In the intermediate forming rolls after 4A and 14B, the torsion of the material to be formed 1 is corrected. However, the degree of twist is large;
If it is impossible to correct the twist using only these movable rolls 14A and 14B, or if this movable roll 14A
, Since the twist correction at 14B may be insufficient, y
The intermediate sub-form rolls 20A, 20B and the movable roll 2 following the
Another pair of torsion detectors D3.4A and 24B are also provided. After arranging D4 and movable rolls 24A and 24B, detecting the remaining torsion, and correcting the torsion using the movable rolls 24A and 24B in the same manner as described above, the material to be formed 1 is introduced into the fin path rolls. It has become.

In this embodiment, two pairs of movable rolls are provided, and the torsion is corrected by these two pairs of movable rolls, and the torsion detector is connected to two pairs of intermediate forming rolls in front of each movable roll. However, the nine positions of the movable roll and the torsion detector may be appropriately set as necessary. When using multiple pairs of movable rolls, the operations of the multiple pairs of movable rolls may be controlled in a coordinated manner, or torsion may be detected visually and the position of the movable rolls adjusted by human judgment. You can do it as well.

(Effect of the invention) According to the present invention, it is possible to adjust the position in the intermediate forming zone.
By ascertaining the torsion that occurs in the material to be formed in the intermediate formation process at an early stage and adjusting the position of the movable roll as appropriate without stopping the line, the torsion correction (rotation) can be applied to the material to be formed. ) It is possible to apply a moment, correct twist easily and quickly, and achieve stable molding.
Ru.

In addition, excellent effects such as no problem of edge damage to the material to be formed and no decrease in yield due to cutting process, which are caused by conventional two-lunge presser rolls, etc., can be obtained.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention, in which (a) is a schematic plan explanatory diagram, and (b) is an A-A' in (a).
Schematic explanatory diagram of a cross section viewed from the line arrow, (C) is B in (a)
-B' is a cross-sectional schematic explanatory view taken along the line arrow. Moreover, FIG. 2 is a schematic explanatory diagram of the principle of torsion correction by the movable roll in the present invention. Figure 3 is a schematic diagram of breakdown molding, Figure 4 is a schematic diagram of 40-le type fin pass molding, Figure 5 is a schematic diagram of cluster type molding, and Figure 6 is a schematic diagram of cage type molding. Explanatory diagram,
FIG. 7 is a schematic explanatory diagram of a flange presser roll conventionally used to prevent twisting, and FIG. 8 is a schematic explanatory diagram of a torsion prevention device in a conventional intermediate forming zone in which the flange presser roll of FIG. 7 is arranged. (a) The figure is a schematic plan view, (b)
The figure is (a) a schematic explanatory view taken along the line A-A' in figure 9.
The figure is a schematic explanatory diagram of the twisting phenomenon. l... Material to be formed, 7... Breakdown roll, 8
... Intermediate roll stand, 9 ... Lifting device, 10
. 20... Intermediate forming roll, 11... Roll spacing adjustment device, 12... Bottom roll, 13... Support frame, 14.24... Movable roll, 15.25... Drive actuator, 16 ...Finba Roll.

Claims (1)

[Claims] Among the forming roll groups in the intermediate forming zone, one or more pairs of rolls are movable rolls whose position can be adjusted independently with respect to the material to be formed, and the forming roll group including these movable rolls controls the formation of the material to be formed during the forming process. A twist correction device in an intermediate forming zone of an electric resistance welded pipe, characterized by detecting twist and adjusting the position of a movable roll according to the twist to apply a rotational moment for twist correction to a material to be formed.