JPS59223116A - Manufacturing equipment of electric welded tube - Google Patents

Abstract

PURPOSE:To obtain a titled equipment by which all the rear end part of a material is drawn out of the final sizing roll stand, by providing a driving means on a vertical forming roll of a roll stand of the final stage for manufacturing an electric welded tube at every one coil, and constituting it so that a carrying force is generated. CONSTITUTION:In a roll stand train of an electric welded tube manufacturing equipment, a horizontal roll 14 of a stand of the final stage of the final sizing roll stand train is driven by a motor 18 through a reduction gear 12, a spindle 16, a horizontal roll shaft 15, etc., also a vertical roll 19 is driven through bevel gears 20, 21 by a motor 22, and a driving force is given to four pieces of the horizontal and vertical forming rolls 14, 14, 19 and 19, by which the rear end part 13 of an electric welded tube manufactured at every one coil can be drawn out entirely without leaving it in the final sizing roll stand train.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an electric resistance welded tube manufacturing facility, and particularly to a large diameter electric resistance welded tube manufacturing facility that manufactures each coil one by one.

[Background of the invention]

As is well known, ERW pipes are made by continuously forming metal strips of a predetermined width into a tubular shape using forming rolls, heating the joints centrally using high-frequency current, etc., and pressing them together with squeeze rolls to create a circular pipe. This is further sized and manufactured into a desired product size and shape. Some large-diameter ERW pipe manufacturing equipment manufactures ERW pipes for each coil without installing a welder to join the leading and trailing coils in the front equipment due to economic considerations. In this kind of equipment, the part that corresponds to the rear end of the coil in the sizing roll stand row of the final forming roll stand row has a material transport capacity during forming of the part that corresponds to the rear end of the coil after passing through the fin pass roll stand in the previous stage. There is a problem. In other words, in a stand with a row of sizing roll stands, depending on the forming conditions,
There are some that do not have the ability to transport materials. In particular, there are molding conditions when manufacturing large-diameter ERW pipes. In other words, even if an attempt is made to form the portion corresponding to the rear end of the coil after the rear end of the material has passed through the fin pass roll stand in the previous stage, the material will not advance and the driving forming roll will idle.

The conditions under which material can be fed with a four-roll forming roll stand are 2Pu (μmtanθH12PvtanθV > (1
- (1) However, the two horizontal rolls are drive rolls, and the two vertical rolls are free rolls, and in equation (1), PR is the horizontal roll forming load, Pv is the vertical roll forming load, and μ is the friction between the roll and the material. The coefficient θH is the bite angle at the neutral point during horizontal roll forming, and θV is the bite angle at the neutral point during vertical roll forming. Furthermore, friction loss is not considered here.

From equation (1), the conveyance force is only 2PHμ of the horizontal drive roll, and the rest acts as resistance to conveyance. The reason for the above-mentioned phenomenon in which the material cannot be fully conveyed is that the term serving as resistance in equation (1) becomes larger than the term serving as conveying force. If this phenomenon occurs, when molding the trailing coil into the same shape as the leading coil, press the part that hits the rear end of the leading coil with the part that hits the tip of the trailing coil, and press the part that hits the rear end of the leading coil. By assisting the conveying force, the sizing molding of the part corresponding to the rear end of the preceding coil is completely completed. However, when the trailing coil is molded into a different shape from the leading coil, a complete problem arises.

In this case, either pull out the material that is stuck inside the row of sizing roll stands from the outside using a crane, or if this is difficult, cut the material between the stands, fully release the roll, and pull it out. You won't get any more. In this case, the material between the stands becomes scrap, resulting in heavy losses. Well, the work itself takes a lot of man-hours.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide an electric resistance welded tube manufacturing facility that solves the above-mentioned problems in the sizing crawl stand row for final forming in a facility that manufactures electric resistance welded tubes for each coil.

[Overview of the invention]

The key point of the present invention is to apply a driving force to the vertical forming rolls, so that a conveying force is also generated on the vertical rolls, and to move the rear end of the material to the stage before the final stage stand so that the entire rear end of the material can pass through the final sizing roll stand row. It is designed to count and drive vertical forming rolls.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings. 1st
The figure shows a plan view illustrating the overall configuration of the present invention. (al
The flat metal strip 1 in the state shown in FIG. 1, a cage roll 3 which performs narrowing, a fin pass stand row 4 which restrains the edge of the metal band one by one, and performs the entire forming into the state shown in (C), a bath welding device which centrally heats the seams of the metal band using high-frequency current, etc. machine 5, a weld pressurer 6 with a squeeze roll that presses the joint that has been centrally heated; A cooling zone 8 for cooling the heated tube, a sizing roll stand row 9 for forming the DL-shaped circular tube into the desired product size and shape, a Turk's head 10 for correcting the bending of the formed tube, It consists of a cold saw 11 that cuts the formed pipe.Although the front equipment before the breakdown stand row 2 is not shown, there is no welding machine for joining the leading coil and trailing coil. ■Thread each coil to the forming stand.

That is, the metal strip passed from the front equipment has a flat RA shape at the time, but as it passes through the breakdown roll stand row 2, the cage roll 3, and the fin pass roll stand row 4, it becomes (b ).

The tube is sequentially formed into the shape shown in (c) and then turned into the shape shown in FIG. next,
Cooling zone 8, size crawl stand row 9, Turks Herad 10, from (d) shape to square tube, (e)
, ridge, (gl) In the case of a round tube, it is formed into a finished product size shape with q, ridge, (j).Next, it is cut to a predetermined length with a cold saw 11, and then it is electrically sewn to a predetermined length. A pipe 12 is manufactured. Since this equipment does not include a welding machine for joining the leading coil and the trailing coil, the rear end 13 of the leading coil is attached to the fin pass roll stand row 4 as shown in FIG. , the welt fresher 6 is removed and conveyed only by the sizing roll stand row 9.

At this time, if the sizing roll stand row 9 does not have the ability to transport the leading end 13i of the preceding coil, the leading end 13 of the leading coil will be in the state 11 shown in FIG. 1, making it impossible to form. If the trailing coil performs the same forming, it is recommended to push it with the rear end of the leading coil, which is the tip of the trailing coil, to assist the conveying force (Breaktown roll stand row 2, Finpass roll stand row 4). If the conveying force is fully utilized), the preceding coil can completely complete the forming. However, when molding irregular shapes, it becomes a complete problem. In other words, the entire rear end of the tip coil can be pulled out using another external force such as a crane, or if that is not possible, it can be cut with gas or the like between the stands of the sizing roll stand row 9, and the roll can be fully opened and pulled out. I can't meet you. In this case, the entire rear end portion 13 of the tip coil shown in FIG. 1 becomes scrap, resulting in a great loss. Therefore,
In the present invention, the final stage of the sizing roll stand row 9 shown in Fig. fiK1 is provided with a drive mechanism as shown in Fig. 2.

This drive mechanism includes a horizontal roll 14 and a horizontal roll shaft 1.
5, horizontal roll drive spindle 16, horizontal roll drive reducer 17, horizontal roll drive motor 18, vertical roll 19,
It consists of gears 20, 21 and a vertical roll drive motor 22. In all conventional sizing roll stands, only the horizontal roll 14 was driven and the vertical roll 19 was a free roll, but if the vertical roll 19 is driven in this way, a conveying force is also generated on the vertical roll 19. That is, the above equation (1) is 2Pi(μmjanθP+)+2Pv I p
-tanov)>.

...(2) In this equation (2), 2Pv·μ is the newly generated conveying force. Moreover, the conveying force P+ of this sizing roll stand is Rt = 2 PRIl (p-janθHz) +
2 Pv+e (p-tanθvt)...(3) The conveying force of other sizing roll stands without vertical roll drive is: P+ = 2PR(p-janθM) 2Pvtan
θv (4). However, the subscript 1 refers to the stand number counted from the beginning of the sizing roll stand row.

Therefore, if PI0ΣPI'>O...r51-1 (where n is the number of sizing stands) is satisfied, the rear end 13 of the preceding coil can be moved by the sizing roll without requiring all external force from a crane or the like. It is possible to pass through the stand row 9.

The above is the vertical position of the final stage of sizing roll stand row 9.
An example of driving four horizontal rolls has been shown, but if you consider the conveyance force and conveyance resistance of the entire sizing roll row 9 under various molding conditions of the equipment, count them in the stage before the final stand, and drive the necessary number of stages. , no problem under any molding conditions.
Can be molded.

〔Effect of the invention〕

According to the present invention, it is no longer necessary to pull out the material with a crane or the like, or to cut the material between stands, and then pull out the material by fully releasing the roll, thereby improving the yield of the material and reducing the number of work steps.

[Brief explanation of the drawing]

FIG. 1 is a plan view illustrating the overall configuration of the present invention, and FIG. 2 is a system diagram showing an example of driving four horizontal and vertical forming rolls of the present invention. 9...Sizing roll stand row, 14...Horizontal formation (lO)

Claims (1)

[Claims] 1. ERW pipe manufacturing equipment, characterized in that in a roll stand row, driving means are provided for four horizontal and vertical forming rolls of the roll stand on the roll stand side of the final stage. . 2. In claim 1, the driving means for the vertical forming roll of the roll stand includes a first
An electric resistance welded pipe manufacturing equipment comprising: a vertical roll provided with a bevel gear; a second bevel gear meshing with the first bevel gear; and a driver for the second bevel gear.