JPH0332424A - Method and device for straightening root-bend of tube - Google Patents

Abstract

PURPOSE:To straighten the root-bend of a tuber with high efficiency by inserting and pressing the tube by two pieces or more of straightening rolls, bringing the tube to spiral movement by a skew rotation of at least one piece of straightening roll, and executing an adjustment so that rolling down force applied in the longitudinal direction of the tube becomes maximum in the maximum bend part. CONSTITUTION:A straightening device 10 inserts and presses a straightening object tube 11 among three pieces of straightening rolls 12A-12C, and brings the tube 11 to spiral movement by a skew rotation of the upper straightening roll 12C under driving of the lower straightening rolls 12A, 12B by a motor 15. Also, by an ascent and a descent of the upper straightening roll 12C executed by a crush force adjusting cylinder 17, crush force applied to each part in the longitudinal direction of the tube 11 can be adjusted so as to become maximum in the maximum bend part of the tube 11. Accordingly, by allowing the straightening object tube 11 to pass through among the straightening rolls 12A-12C, and only adjusting the crush force applied to the straightening tue 11, the root-bend of the tube 11 can be straightened.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method and device for correcting nasal curvature of a tube.

[Prior Art] In a pipe manufacturing line such as a seamless steel pipe manufacturing line, bending of the pipe may occur due to an error in the bus level of the line.

Japanese Patent Application Laid-Open No. 57-190722 discloses that in order to correct the bending of a pipe, as shown in FIG. 7, a plurality of pairs of inclined rollers,
A bend straightening machine using 2.3 is disclosed. This straightening machine applies a certain bending moment Ax to the tube to be straightened passing through the inclined roller pairs 1 to 3 by offsetting the central inclined roller pair 2 with respect to the inclined roller pairs 3 on both sides, for example. This is an attempt to correct the curvature.

[The problem that the invention tries to solve! II] Although the bend straightening machine shown in FIG. 7 is suitable for high-efficiency precision straightening, it cannot correct local pipe bends (hereinafter referred to as nose bends) where the distance between adjacent pairs of inclined rollers is less than 2.3.

Note that the nasal curvature of the tube can be corrected by using a press straightening machine and arbitrarily adjusting the positions of support points provided on both sides of the press point. However, when using this press straightening machine, there are problems such as deformation of the press point and low work efficiency.

The present invention aims to reliably correct the nasal curvature of a tube with high efficiency.

[Means for Solving the Problems] The method for correcting nasal curvature of a tube according to the present invention as set forth in claim 1 includes:
The tube to be straightened is pressed between two or more straightening rolls, the tube to be straightened is moved spirally by skew rotation of at least one straightening roll, and a crushing force is applied to each part of the tube to be straightened in the longitudinal direction. It is made to continuously adjust so that the maximum value is reached at the maximum direction of the pipe.

The nasal curvature correction device according to the present invention according to claim 2 includes:
It is equipped with two or more straightening rolls that pinch the pipe to be straightened, at least one of the straightening rolls is configured to be able to skew rotate, and the crushing force applied to each part in the longitudinal direction of the pipe to be straightened is continuously adjusted. The device is equipped with a crushing force adjusting device to obtain the required crushing force.

[Operation] According to the present invention, the nasal curvature of the tube to be corrected is corrected as follows.

(1) The tube to be straightened is compressed by two or more straightening rolls.

At this time, as shown in FIG. 4, a tension side bending moment Mt and a compression side bending moment Me are generated around the tube axis 0 of the tube cross section due to the crushing force (rolling blade) P.

Therefore, under the action of the crushing force P, a bending moment Mx, which is the sum of the bending moments Mt and Me, is applied to the tube cross section around the tube axis 0.

(2) The tube to be straightened is moved helically by the skew rotation of at least 61 straightening rolls under the action of the crushing force described in (1) above.

(3) During the spiral movement of the tube to be corrected according to (2) above,
The crushing force (11) above is continuously adjusted according to the bending of the pipe.

That is, as shown in Fig. 5, when the end of the tube is A, the maximum direction part is B, and the sound part is C, the crushing force Px applied to each part in the longitudinal direction of the tube to be straightened is equal to the maximum direction part. It is made to change continuously so that it reaches a maximum at B and decreases on both sides.

Thereby, the bending moment Mx applied around the tube axis O of the tube cross section is adjusted at each portion in the longitudinal direction of the tube to be corrected, and as a result, the nasal curvature can be corrected.

Therefore, according to the present invention, as in (1) to (3) above,
The nasal curvature of the tube can be corrected simply by passing the tube to be straightened between the straightening rolls and adjusting the crushing force that the straightening rolls apply to the tube to be straightened. That is, the nasal curvature of the tube can be reliably corrected with high efficiency.

[Example] Fig. 1 is a front view showing an example of the nasal curvature correction device of the present invention;
Fig. 2 is a side view of Fig. 1, Fig. 3 is a schematic diagram showing the straightening roll, Fig. 4 is a schematic diagram showing the crushing force applied state by the straightening roll, and Fig. 5 is a schematic diagram showing the crushing force adjustment pattern by the straightening roll. FIG. 6 is a diagram showing the relationship between the amount of crush and the amount of residual straightness, and FIG. 7 is a schematic diagram showing a conventional tube straightening machine.

As shown in FIGS. 1 to 3, the nasal curvature correction device 10 includes three straight-shaped correction tubes 11 that pinch the tube 11 to be corrected.
−jL, 12 A, 12 B, 12 C″+, (1
There are m, t.

At this time, the two lower straightening rolls 12A and 12B are supported by a fixed bearing stand 14 fixed to the frame 13 and driven by a motor 15.

Further, one upper straightening roll 12C is supported by an elevating bearing pedestal 16 that is coupled to the frame 13 so as to be movable up and down, and is moved up and down together with the elevating bearing pedestal 16 by a crushing force adjustment cylinder 17. In addition, the upper straightening roll 12C
A skew angle that is inclined with respect to the axial direction of 1 is provided.

That is, the straightening device 10 clamps the tube 11 to be straightened between the three straightening rolls 12A to 12C, and under the drive of the lower straightening rolls 12A and 12B by the motor 15, the upper straightening roll 1
The skew rotation of 2c causes the tube 11 to be corrected to move helically. Furthermore, the straightening device 10 moves the upper straightening roll 12C up and down by the crushing force adjusting cylinder 17 so that the crushing force applied to each part in the longitudinal direction of the straightening target tube 11 is maximized at the maximum target part of the straightening target tube 11. can be adjusted continuously.

Next, the operation of correcting the nasal curvature of the tube to be corrected 11 using the correction bag [10] will be explained.

(l) The tube 11 to be straightened is compressed by the three straightening rolls 12A to 12C.

At this time, as shown in FIG. 4, a tension side bending moment Mt and a compression side bending moment Mc are generated around the tube axis O of the tube section due to the crushing force (rolling blade) P.

In the example of the 30-type orthodontic appliance 3f10 shown in Fig. 4, when the tube radius is R, M t = 0.16P RlMc
There is =0.158PRte.

Therefore, under the action of the crushing force P, a bending moment Mx, which is the sum of the bending moments Mt and Mc, is applied to the area around the pipe waste O in the cross section of the pipe.

(2) The tube 11 to be straightened is moved helically by the skew rotation of the upper straightening roll 12C under the action of the crushing force described in (1) above.

(3) During the spiral movement of the tube 11 to be corrected according to (2) above, the crushing force described in (1) above is continuously adjusted according to the bending of the tube 11.

That is, as shown in FIG. 5, when the end of the pipe 11 is A, the maximum target part is B, and the sound part is C, the crushing force Px applied to each part in the longitudinal direction of the pipe 11 to be corrected is the maximum It is made to change continuously so that it reaches a maximum at portion B and decreases on both sides thereof.

Thereby, the bending moment Mx applied around the tube axis O of the tube cross section is adjusted at each portion in the longitudinal direction of the tube 11 to be corrected, and as a result, the nasal curvature can be corrected.

Therefore, according to the above embodiment, as in (11 to (3) above), the tube 11 to be straightened is passed between the straightening rolls 12A to 12C, and the crush imparted to the tube 11 to be straightened by the straightening rolls 12A to 12C. Just by adjusting the force, tube 1
1. Can correct the crooked nose. That is, the nasal curvature of the tube 11 can be reliably corrected with high efficiency.

As a result of the inventor's experiments, for a pipe with an outer diameter of 60.5ml 1φ, a wall thickness of 3.9mII+t, and 3TPG38, when the crush M was varied in the range of -0.5mg+ to +0.5H, the amount of residual oil ( +am/m) was as shown in FIG.

Further, in carrying out the present invention, the straightening roll is not limited to a straight roll as shown in FIG. 3, but a center convex roll, a center concave roll, or the like may be used.

[Effects of the Invention] As described above, according to the present invention, the nasal curvature of a tube can be reliably corrected with high efficiency.

[Brief explanation of drawings]

FIG. 1 is a front view showing an example of the nasal deformity correction device of the present invention;
Fig. 2 is a side view of Fig. 1, Fig. 3 is a schematic diagram showing the straightening roll, Fig. 4 is a schematic diagram showing the crushing force applied state by the straightening roll, and Fig. 5 is a schematic diagram showing the crushing force adjustment pattern by the straightening roll. FIG. 6 is a diagram showing the relationship between the amount of crush and the amount of residual straightness, and FIG. 7 is a schematic diagram showing a conventional tube straightening machine. DESCRIPTION OF SYMBOLS 10... Nasal curvature correction device, 11... Tube to be corrected, 12A to 12C... Correction roll, 17... Crush force adjustment cylinder.

Claims (2)

[Claims] (1) Press the tube to be straightened between two or more straightening rolls,
The tube to be straightened is moved spirally by the skew rotation of at least one straightening roll, and the crushing force applied to each part of the tube to be straightened in the longitudinal direction is continuously adjusted so that it becomes maximum at the maximum bending part of the tube to be straightened. A method for correcting nasal curvature. (2) Two or more straightening rolls that pinch the tube to be straightened are provided, and at least one of the straightening rolls is configured to be capable of skew rotation, and a crushing force is continuously applied to each part of the tube to be straightened in the longitudinal direction. A device for straightening the nasal curvature of a tube, comprising a crushing force adjustment device that can be adjusted to