JPH0634810U - Square tube bending correction device - Google Patents

Abstract

(57) [Summary] [Object] To provide a square tube bending correction device capable of correcting the bending of the rectangular tube sufficiently over the entire length up to the tube end of the rectangular tube and preventing the occurrence of welding defects. [Structure] Three first, second, and third scaring stands, each equipped with four rolls that press against each surface of the square tube, are arranged in that order. 12 is used as a driving roll to feed the square tube P, and the second squaring stand is provided with a roll housing 35.
The X-axis adjusting worm jack 45 and the Y-axis adjusting worm jack 53 are made displaceable in the X-axis and Y-axis directions, and the square tube P is
Support points to correct bending. Further roll housing 35
Was rotated by the twist adjusting device 61 to correct the twist of the square tube P.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a square tube bending correction device. More specifically, the present invention relates to a straightening device for straightening a bend caused by hot finishing in a pipe forming machine for forming a square tube.

[0002]

[Prior art]

 When cold-forming a square tube, in order to remove the residual stress generated in the corner R portion of the square tube, the pipe corner R portion is heated and annealed with an induction heater or the like. At this time, if the corners R of the four corners are unevenly heated, bending due to thermal distortion occurs. To correct this bend, a turks head is placed in the final stand of the pipe making machine. In the conventional turks head, as shown in Japanese Utility Model Laid-Open No. 63-25211, four forming rolls are arranged vertically and horizontally centering on the pass line and supported by the roll housing, and each roll has a pressing screw. Is attached, and the roll can be pressed against each surface of the square tube. There is also a roll housing or a stand that supports four rolls, which can be moved in the X-axis and Y-axis directions on a plane perpendicular to the pass line.

[0003]

[Problems to be solved by the device]

 However, the conventional example has the following problems. Since the conventional turks head is clamped at one point in the longitudinal direction of the square tube, even if the four rolls are moved in the X-axis and Y-axis directions, the bending cannot be corrected sufficiently. Since all four rolls of the Turks head were idler rolls (non-driven), the final end of the square tube could not be conveyed and the bending of the end of the square tube could not be corrected. Since the roll is not driven, the resistance at the time of straightening the transfer is large, and the speed of the mill forming feed varies. At the entry side of the pipe forming machine, a pipe is welded by a welding machine. However, since welding defects occur when speed fluctuations occur in a short time, the above uneven speed contributed to welding defects.

In view of such circumstances, the present invention provides a square tube bending correction device capable of correcting the bending of the rectangular tube sufficiently over the entire length up to the tube end of the rectangular tube and preventing the occurrence of welding defects. The purpose is to

[0005]

[Means for Solving the Problems]

 The straightening device for straightening a square tube of the first invention comprises three first, second and third scaring stands each provided with four rolls that are pressed against each surface of the square tube. The link stand is a drive roll in which the upper and lower pair rolls or the left and right pair rolls are driven by power, and the second squaring stand is displaceable in the X-axis and Y-axis directions on a plane where the roll housing is perpendicular to the pass line. It is characterized by A square tube bending correction device according to a second aspect of the invention is characterized in that the roll housing of the second squaring stand is configured to be rotatable around a pass line.

[0006]

[Action]

 According to the first invention, the first, second, and third squaring stands sandwich the three positions in the longitudinal direction of the rectangular tube, and one of them is the four rolls of the second squaring stand in the X-axis direction. And / or it can be displaced in the Y-axis direction, so that the bending of the rectangular tube is effectively corrected. Further, since the upper and lower pair rolls or the left and right pair rolls of the first and third stands are driving rolls, the pipe end can be conveyed, and thereby the bend can be corrected to the pipe end. Further, since power is fed during straightening of the conveyance, uneven speed does not occur, and welding defects due to uneven speed do not occur. According to the second aspect, the twist of the rectangular tube can be corrected by rotating the roll housing around the pass line.

[0007]

Embodiment Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a part of a pipe forming machine in which a square pipe bending correction device according to an embodiment of the present invention is installed.

P is a square tube and is sent in the direction of arrow D. Four of them are press caring stands, which are preformed from a round tube material into a cross-sectional shape close to a square tube. An induction heater 5 heats a corner R portion of the square tube P. At this time, the heat load on the upper and lower surfaces of the tube and on the left and right sides of the tube slightly changes due to the imbalance of heating and the cooling effect of the roll coolant water accumulated in the tube, and this change causes bending of the square tube P. Reference numeral 6 is a guide roller provided between the induction heaters 5.

Reference numerals 1, 2, and 3 are first, second, and third squaring stands, which constitute the bending correction apparatus E of this embodiment. Reference numeral 7 shown in FIGS. 1 and 2 is a detector for detecting the lateral displacement of the rectangular tube P, and 8 is a detector for detecting the vertical displacement amount. In this embodiment, a detector 9 for detecting the twist is also provided because it has the function of correcting the twist. Then, the detection results of the detectors 7, 8 and 9 are sent to the control device 10, where the output necessary to correct the bending and twisting is calculated and the X-axis adjusting worm jack of the second stand 2 described later is calculated. 45, Y-axis adjusting worm jack 53 and torsion rotation adjusting device 61. As a result, the bending straightening device E corrects the bending and twisting of the rectangular tube P and finish-molds its cross-sectional shape.

Next, a specific configuration of each squaring stand included in the bending correction device E will be described. 4 to 5 show a front view and a side view of the first squaring stand. Since the third squaring stand 3 has the same configuration as the first squaring stand 1, the description thereof will be omitted and the description of the first squaring stand 1 will be representative. 11,12 are upper and lower pair rolls, and 13,14 are left and right pair rolls. The roll housings 11a and 11b of the upper roll 11 are mounted on two stand housings 15 and 16 so as to be able to move up and down, and a reduction device 19 including a worm jack 17 and a motor 18 is connected to each of them. Similarly, the lower roll 12 also has roll housings 12a and 12b mounted on the stand housings 15 and 16 so as to be able to move up and down, and a reduction device 19 is connected thereto. Further, drive shafts 21 and 22 are connected to the upper roll 11 and the lower roll 12, respectively, so that the drive rolls are driven to rotate by a drive device (not shown).

The side rolls 13 and 14 are rotatably supported by the roll chocks 13a and 14a, respectively, and the roll chucks 13a and 14a are slidably mounted on the side roll housings 13b and 14b, respectively. It is configured to be adjustable. Although the side rolls 13 and 14 are idler rolls, they may be drive rolls instead of the upper and lower rolls 11 and 12.

6 to 8 show a front view, a rear view and a side sectional view of a main part of the second stand 2. In FIG. 6, 31, 32 are upper and lower rolls, and 33, 34 are left and right rolls. Each roll 31, 32, 33, 34 is rotatably supported by roll chocks 31a, 32a, 33a, 34a, and is slidably mounted on a roll housing 35. Each roll consists of a worm jack 36 and a motor (not shown). The reduction device is connected.

A stand housing 42 is slidably mounted on the base frame 41, and an X-axis adjusting worm including a worm jack 43 and a motor (not shown) is provided between the base frame 41 and the stand housing 42. The jack 45 is interposed. As shown in FIG. 7, a square space 46 is formed in the center of the stand housing 42, and slide guides 47 are formed on both sides of the space 46. Then, guided by the slide guide 47, the inner slide base 48 is fitted so as to be able to move up and down. A screw shaft 51A of a Y-axis adjusting worm jack 53 including a worm jack 51 and a motor 52 is connected between the upper end of the inner slide base 48 and the stand cap 49 of the stand housing 42.

As shown in FIG. 8, a circular guide hole 55 is formed at the center of the inner slide base 48, and a rotary base 56 is rotatably fitted inside the guide hole 55. The roll housing 35 (see FIG. 6) is fixed to the front side of the rotary base 56, and the worm wheel 57 is fixed to the rear side. As shown in FIG. 7, the worm wheel 57 has teeth 58 formed in a part thereof, and the worm 59 meshes with the teeth 58. Reference numeral 60 denotes a motor that drives the worm 59 to rotate and is attached to the inner slide base 48. The torsion adjusting device 61 is configured by these.

Based on the above configuration, in the second squaring stand 2, by driving the X-axis adjusting jack 45, the four rolls 31, 32, 33, 34 as a whole are horizontally moved in a plane perpendicular to the pass line. The four rolls 31, 32, 33, 34 can be displaced in the vertical direction by driving the Y-axis adjusting jack 53, and the pass line can be rotated by driving the twist adjusting device 61. As a center, the four rolls 31,32,33,34 can be rotated as a whole.

As shown in FIG. 3A, the bending correction apparatus E of this embodiment may be arranged in the order of the first stand 1, the second stand 2, and the third stand 3. As shown in FIG. 3B, the first stand 1, the third stand 3, and the second stand 2 may be arranged in this order. In either case, since the bending is applied with the square tube 2 supported at two points, the bending can be effectively corrected. In addition, in the case of the present embodiment, since the first stand 1 and the third stand 3 feed the square tube P by the drive rolls 11 and 12, the feed rate of the square tube P does not become uneven, and No welding defects due to unevenness occur. Further, since the rectangular tube P is fed to the end of the tube, the bending at the end of the tube can be corrected. Furthermore, if the four rolls 31, 32, 33, 34 are rotated in their entirety by the twist adjusting device 61, the twist can be corrected in the same manner as bending.

[0017]

[Effect of device]

 ADVANTAGE OF THE INVENTION According to this invention, the bending of a square pipe can be corrected sufficiently over the entire length up to the pipe end, and the occurrence of welding defects can be prevented.

[Brief description of drawings]

FIG. 1 is a square tube bending correction device E according to an embodiment of the present invention.
It is explanatory drawing which shows a part of pipe forming machine which installed.

FIG. 2 is an explanatory diagram showing an arrangement example of displacement amount detectors and the like of a square tube P.

FIG. 3 is an explanatory diagram showing an arrangement sequence of each squaring stand in the square tube bending correction device E.

FIG. 4 is a front view of the first squaring stand 1.

FIG. 5 is a side view of the first squaring stand 1.

FIG. 6 is a front view of a second squaring stand 2.

FIG. 7 is a side view of the second squaring stand 2.

8 is a sectional view taken along line VIII-VIII in FIG.

[Explanation of symbols]

1 1st squaring stand 2 2nd squaring stand 3 3rd squaring stand 35 Roll housing 45 X-axis adjusting worm jack 53 Y-axis adjusting worm jack 61 Torsion adjusting device

Claims (4)

[Scope of utility model registration request] 1. A three-unit first, second, and third scaring stand, each equipped with four rolls that press against each surface of a square tube, wherein the first and third scare link stands are both upper and lower. A pair of rolls or a pair of left and right rolls is a drive roll driven by power, and the second squaring stand is a square tube characterized in that the roll housing is displaceable in the X-axis and Y-axis directions on a plane perpendicular to the pass line. Bending correction device. 2. The square tube bending correction device according to claim 1, wherein the roll housing of the second squaring stand is rotatable about a pass line. 3. The square tube bending correction device according to claim 2, wherein each of the squaring stands is arranged on the pass line in the order of the first, second and third squaring stands. 4. The square tube bending correction device according to claim 2, wherein each of the squaring stands is arranged on a pass line in the order of the first, third and second squaring stands.