JPH04294825A - Adjusting equipment for split forming roll - Google Patents

Abstract

PURPOSE:To reduce the time and labor for the set up change and to improve the quality of a product while an equipment is compacted and its reliability is ameliorated, when an interval between split rolls is adjusted according to the change of size of a tube to be manufactured. CONSTITUTION:This adjusting equipment consists of a pair of right and left sliding sleeves 26A, 26B installed between right and left main shaft supporting parts 23A, 23B movably around the main shaft 24 in the shaft direction, and supporting the left and right split rolls 13A, 13B, and a screw shaft 29 having both ends supported by right and left screw shafts supporting parts 28A, 28B, arranged in parallel to the main shaft 24 on one side of the main shaft 24 and providing right and left screw parts 29A, 29B, and a pair or right and left nuts 33A, 33B held by a pair of right and left nuts holding parts 32A, 32B integrated to each of right and left sliding sleeves 26A, 26B and screwed in each of right and left screw parts 29A, 29B of the screw shaft 29.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a split forming roll adjustment device in a roll forming apparatus for a welded steel pipe manufacturing line.

0002

[Prior Art] A roll forming device used in a welded steel pipe production line that continuously processes steel strips is equipped with an upper roll and a lower roll as forming rolls, and the steel strip is passed between the rolls and bent into a so-called flower. Replacing the forming rolls every time the size changes requires a large number of rolls with different dimensions, which is not easy to replace and increases costs.In recent years, split roll methods have become mainstream. There is.

[0003] This split roll system consists of split rolls that divide the forming roll into left and right halves, and the pipe size can be changed by adjusting the mutual spacing. The adjusting means includes, for example,
There is one that has a spiral adjustment mechanism as shown in JP-A-57-28627, and one that replaces the spacer between divided rolls as shown in JP-A-57-209722.

0004

However, in the former adjustment means, the horizontal main shaft itself is a screw, and by screwing a pair of nuts onto the screw and screwing the nuts,
A pair of split rolls that are movably fitted on the main shaft are each moved in the axial direction to adjust the distance between the split rolls, so when the split rolls are subjected to a high load, the threaded part There is a high risk that the main shaft will break due to stress concentration. Furthermore, since there is no backlash adjustment mechanism, it is unsuitable for manufacturing thin plate pipes, which particularly requires high precision.

[0005] In addition, the latter adjustment means interposes a spacer between the pair of left and right divided rolls, and the spacer is replaced with one of a different size as necessary.
The spindle must be removed from the device, the split rolls and spacers must be removed from the spindle, the spacers must be changed to different dimensions, reassembled, and incorporated into the device, which requires considerable time and effort.

[0006] Furthermore, the divided forming roll adjusting device is required to have a compact structure so as not to increase the overall space of the roll forming device.

[0007] The present invention reduces the time and labor required for setup changes, and improves product quality while making equipment more compact and increasing reliability when adjusting the interval between divided rolls in response to changes in pipe manufacturing size. The purpose is to improve.

[0008]

[Means for Solving the Problems] The present invention supports a main shaft at both ends on left and right main shaft support parts provided on a support frame, rotatably supports a pair of left and right split rolls around the main shaft, and provides space between the two split rolls. A split molding roll adjusting device that is capable of adjusting the roll interval between the left and right main shaft support parts, and a pair of left and right sliding sleeves that are mounted to be movable in the axial direction around the main shaft between the left and right main shaft support parts, and that support the left and right split rolls; , a screw shaft supported at both ends by left and right screw shaft support parts provided on the support frame, arranged parallel to the main shaft on one side of the main shaft, and provided with left and right threaded parts; a pair of left and right nut holders integral with each of the left and right sliding sleeves, and a pair of left and right nut holders held by the left and right nut holders and screwed onto the left and right threaded portions of the screw shaft, respectively; The nut is configured to include a nut.

[0009]

[Action] According to the present invention, there are the following effects (1) to (2).

(2) Since the main shaft that supports the split rolls and the screw shaft that adjusts the interval between the split rolls are separated, the strength of the main shaft can be easily ensured and the reliability of the equipment can be improved.

(2) Since the screw shaft is arranged parallel to one side of the main shaft, the space around the main shaft can be reduced and the structure can be made more compact.

[0012] The interval between the divided rolls can be adjusted simply by rotating the screw shaft using the operation unit, and the time and effort required for changeover can be significantly reduced.

■Since the screw shaft is separate from the main shaft, precision screws such as ball screws can be used as the left and right screw parts, and the setting accuracy of the split roll interval can be on the order of, for example, 1/100 mm. The quality can also be significantly improved.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a longitudinal cross-sectional view of a main part showing an embodiment of the present invention, FIG. 2 is a cross-sectional view of a main part of FIG. 1, and FIG. 3 is a front view showing a roll forming apparatus.

The roll forming device 10 is a center bend roll device for bending and forming the strip 11 into a tubular shape, and includes left and right divided upper rolls 1 held on an upper roll stand 12.
3A, 13B, a lower roll 15 held by a lower roll stand 14, and left and right cage rolls 17A, 17B held by left and right roll stands 16A, 16B.

Note that the upper roll stand 12 has a lifting device 18.
It has an elevating frame 19 (support frame) that is elevated and lowered by the above-described split roll 13A.
, 13B. Further, the roll stands 16A, 16B have a diagonally moving frame 22 that is moved by a diagonally moving device 21, and the above-mentioned cage rolls 17A, 17B are held on this diagonally moving frame 22.

However, in the roll forming apparatus 10,
Left and right main shaft support parts 23 provided on the above-mentioned lifting frame 19
The main shaft 24 is supported at both ends by A and 23B, and around the main shaft 24 are a linear ball bearing 25, a sliding sleeve 26A,
26B and a ball bearing 27, rotatably supports the pair of left and right divided rolls 13A and 13B. The distance between the two divided rolls 13A and 13B can be adjusted as follows.

That is, in this embodiment, the pair of left and right sliding sleeves 26A, 26B are movable in the axial direction around the main shaft 24 between the left and right main shaft support parts 23A, 23B via linear ball bearings 25. The left and right divided rolls 13A are attached via ball bearings 27,
Supports 13B. In addition, 37A and 37B are the main shaft support parts 2
This is a locking key for the sliding sleeves 26A and 26B relative to the sliding sleeves 3A and 23B.

Further, the lifting frame 19 is provided with left and right screw shaft support parts 28A and 28B, and a screw shaft 29 is rotatably supported at both ends of the screw shaft support parts 28A and 28B via bushes. There is. The screw shaft 29 is the main shaft 2
4 is arranged parallel to the main shaft 24, and includes left and right threaded portions 29A and 29B.

Further, at one end of the screw shaft 29, the screw shaft 2
A handle operation section 31 that can rotate the handle 9 is provided.

Furthermore, left and right sliding sleeves 26A, 26B
Each of the left and right nut holding parts 32A, 3
2B are integrated by attachment nuts 36A and 36B, and a pair of left and right nuts 33A and 33B are fixedly held at the tips of each nut holding portion 32A and 32B. and,
Left and right threaded portions 29A and 29B of the screw shaft 29 are screwed into each nut 33A and 33B.

Note that the left and right threaded portions 29A, 2 of the threaded shaft 29
Lock nuts 34A and 34B for locking the free rotation of the screw shaft 29 by being brought into pressure contact with the end faces of the respective nuts 33A and 33B are screwed onto the bolts 9B. The lock nuts 34A, 34B lock the rotation of the screw shaft 29 after adjusting the roll interval between the two divided rolls 13A, 13B.

Further, a rotary encoder 35 is attached to one end of the screw shaft 29. The rotary encoder 35 detects the amount of rotation of the screw shaft 29.
The roll interval adjustment amount of both divided rolls 13A and 13B is detected. The detection results of the rotary encoder 35 are displayed on a display meter (not shown).

Therefore, in the embodiment described above, when the screw shaft 29 is rotated by the handle operating section 31, the left and right threaded portions 29A, 29B of the screw shaft 29 and the left and right sliding sleeves 26A, 26B are integrated. Each nut holding part 32A, 3
The left and right sliding sleeves 26A, 26B are moved toward or away from each other by screwing with the nuts 33A, 33B held on the sliding sleeves 26A, 26B. Split roll 1
The roll interval of 3A and 13B can be adjusted.

Next, the operation of the above embodiment will be explained.

■Since the main shaft 24 that supports the split rolls 13A and 13B and the screw shaft 29 that adjusts the interval between the split rolls 13A and 13B are separated, the strength of the main shaft 24 is easily ensured and the reliability of the equipment is improved. can increase

(2) Since the screw shaft 29 is disposed parallel to one side of the main shaft 24, the space around the main shaft 24 can be reduced and the structure can be made more compact.

[0028] The interval between the divided rolls 13A and 13B can be adjusted simply by rotating the screw shaft 29 using the handle operating section 31, and the time and effort required for changeover can be significantly reduced.

■Since the screw shaft 29 is separate from the main shaft 24, precision screws such as ball screws can be used as the left and right screw portions 29A and 29B, and the setting accuracy of the interval between the divided rolls 13A and 13B can be set to, for example, 1/100 mm. It can be made to order, and the quality of the product can be significantly improved.

[0030]

[Effects of the Invention] As described above, according to the present invention, when adjusting the interval between divided rolls in accordance with changes in pipe manufacturing size, the time and labor of setup changes can be reduced while making equipment more compact and increasing reliability. can be reduced and the quality of the product can be improved.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a main part showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part of FIG. 1;

FIG. 3 is a front view of the roll forming apparatus.

[Explanation of symbols]

13A, 13B Split roll 19 Support frame 23A, 23B Main shaft support part 24 Main shaft 26A, 26B Sliding sleeve 28A, 28B Screw shaft support part 29 Screw shaft 29A, 29B Threaded part 31　Operation section 32A, 32B Nut holding part 33A, 33B Nut

Claims (1)

[Claims] [Claim 1] A main shaft is supported at both ends by left and right main shaft support parts provided on a support frame, and a pair of left and right split rolls are rotatably supported around the main shaft, so that the roll interval between the two split rolls can be adjusted. In the split forming roll adjusting device,
A pair of left and right sliding sleeves are installed between the left and right main shaft support parts so as to be movable in the axial direction around the main shaft, and support the left and right divided rolls, and both ends are attached to the left and right screw shaft support parts provided on the support frame. a screw shaft that is supported and arranged parallel to the main shaft on one side of the main shaft, and includes left and right threaded portions;
an operating part capable of rotating the screw shaft; a pair of left and right nut holding parts integral with each of the left and right sliding sleeves;
A split forming roll adjusting device comprising: a pair of left and right nuts held by the left and right nut holding portions and screwed onto the left and right threaded portions of the screw shaft, respectively.