KR0160486B1 - Rolling method of non-welding pipe - Google Patents

Abstract

Progressively bending a flat iron plate coated with zinc supplied from an uncoiler between the rolls in the first half of the plurality of upper and lower rolls, gradually bending from the edge of the workpiece to have a predetermined outer shape; Molding the bent workpiece by passing it around the inner center roll in a process in which an inner center roll for forming an inner portion is formed at the latter half of the plurality of upper and lower rolls; And a step of joining the work piece passing through the inner central roll to a final product through a step of bending the work piece sequentially to have a predetermined inner cross-sectional shape.

Description

Roll forming method of non-welded pipe

1 is a side view showing a line of a steel rolling process in which a cutter is combined.

2 is a side view showing a line of the iron rolling process.

3 is a cross-sectional view showing in detail the iron rolling forming process of the present invention.

4 is a perspective view of a roll stand of the roll forming machine of the present invention; And

5 is an exploded view of the inner center roll provided for shaping the inner portion of the workpiece.

* Explanation of symbols for main parts of the drawings

1: Uncoiler 2: Molding Machine

3: cutter 4: finishing table

11,12: up and down roll 13: roll stand

14 axis 15 inner center roll

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling molding method for manufacturing metal tubes and the like by welding without welding in a uniform process using a roll forming machine.

The rolling method is widely used in the manufacture of metal products because there is no waste of stock during rolling and the strength of the rolling mill is superior to that of the cut product. In addition, there is a peak that is faster than the forging or casting and the production cost is low. However, the production process of the steel square tube of the prior art is manufactured in a circular shape, welded and then subjected to various processes in a pull-out square model after the surface treatment of the welded area to produce a rectangular tube and galvanized after commercialization It became. However, these various process relations lowered the efficiency of productivity and caused a cost increase.

In addition, there is a drawback that the zinc plating of the galvanized steel sheet is eroded by peeling off the seam by welding, resulting in poor durability.

On the other hand, in the production of a conventional seamless pipe (seamless pipe) has been used a method of manufacturing by drawing a cylindrical material that is enclosed end of the tube through a die. However, in the above process, the manufacturing cost is expensive and the manufacturing process is complicated due to the process of using high pressure.

In view of the above-mentioned drawbacks, the present invention seeks to provide an iron rolling forming method for most economically obtaining a wide variety of product joint tubes having various cross-sectional shapes.

In order to achieve the above object, the steel sheet forming method of the non-welded pipe according to the present invention has an individual pattern such that the workpiece is sequentially processed into a specific shape by a roll driving force between the upper and lower workpiece steel strips between the upper and lower rolls 11 and 12. In the steel rolling forming method for forming a workpiece into a predetermined shape by placing a plurality of rolls formed on each roll surface in a series of stands, the iron sheet strip advances between the rolls in the first half of the plurality of upper and lower rolls Gradually bending the workpiece while giving a predetermined outer shape, and bending both edges of the joint to face each other, and sequentially bending such that a surface having an upward bent portion of the joint is disposed below a surface having a downward bent portion. ; And a rectangular member having a central roll connected to a workpiece in a direction in which the workpiece is installed in the first half of the plurality of upper and lower rolls in a roll stand in which the workpiece is opened in the opening step, and connected to the workpiece in a straight direction. To allow the workpiece to pass between the center roll and the outer roll so as to cover the circumference of the rectangular member while pushing the surface having the upper edge bent portion disposed below the workpiece by the center roll. Provided is a method for steel rolling forming a non-welded tube including joining by raising.

The rectangular construction may have as many central rolls as necessary to push up the bond edges. When using a very thin iron plate can have only one central roll, but generally 3-5 is preferred.

In addition, in the present invention, the upper and lower rolls support the workpiece that proceeds between the rolls, and the inner center roll is disposed at the center of the rolls so that the workpiece can be pushed out while wrapping the inner center roll.

Hereinafter, with reference to the accompanying drawings will be described in more detail the processes of the iron rolling forming method of the present invention.

1 and 2 are a side view and a plan view showing a line of a steel rolling forming process in which a cutter is combined. The flat iron sheet supplied from the uncoiler 1 is guided to the cutter 3 through a molding process in the molding machine 2 and cut and then guided to the finishing table 4. The cutter may be a saw type metal cutter or press cutters. In addition, Figure 2 shows in detail the process in which the workpiece is molded into the desired final product form through the molding machine.

Referring to FIG. 3, there is shown a cross-sectional view of a flower that specifically illustrates the process of the method of steel rolling forming of the present invention. As shown in FIG. 3, the process of stepwise bending a work piece supplied from an uncoiler by a consistent process using a roll forming machine in the form of a flower is shown. Corresponding to the forming process shown in the lower part of FIG. to be. In FIG. 1 and FIG. 3, the part shown by a) -a) shows the state fixed with the stand immediately before the inner center roll 15 mentioned later in detail is arrange | positioned.

Referring now to FIG. 4, a roll stand of a roll forming machine implementing the rolling method of the present invention is shown in perspective view. The roll forming machine extends through the upper and lower rolls 11 and 12, the roll stands 13 supporting the upper and lower rolls 11 and 12, and the upper and lower upper and lower rolls 11 and 12 and the roll stand 13, respectively. A shaft 14. As described above, the flat iron plate supplied from the uncoiler is formed into a predetermined shape while passing between the upper and lower rolls 11 and 12, and the rolls 11 and 12 are respectively driven by driving means (not shown).

5 is an exploded view showing a stepwise forming process of the inner central roll 15 for processing a workpiece to be bent outwardly and formed into a predetermined shape through a series of steps. Referring to Figures 2, 4 and 5 will be described step by step the process of the steel rolling forming method of the present invention. The galvanized flat iron sheet supplied from the uncoiler is subjected to a molding process such that the external shape is changed through several bending processes as shown in FIG. 2, wherein the flat iron sheet is positioned between the upper and lower rolls 11 and 12. The processing point is as described above. In the latter part of the step-by-step process, the bent workpiece is subjected to the process in which the inner central roll 15 is arranged as shown in FIG. This rectangular structure is provided with a crossbar in the roll stand of a) -a) of the first half of the steel rolling molding, and a crossbar is connected directly under the crossbar to open the work piece a) -a) (FIGS. 1 and 3). It is connected to the inside of the workpiece in the workpiece processing direction.

The inner central roll 15 is disposed in the rectangular structure, and the workpiece is penetrated through several stages gradually in a shape of wrapping between the upper and lower rolls 11 and 12 through the inner central roll 15 to a predetermined final product. Molded. At this time, the upper and lower rolls (11, 12) is to hold and support the workpiece to be advanced to the front, and serves to maintain the external shape of the workpiece in a predetermined form. On the other hand, the inner central roll 15 is formed by molding the workpiece so as to have a desired cross-sectional shape gradually inside the workpiece, and then rolled into a complete product form in the final step. In FIG. 5, the lower support part 16 serves as a support for accurately maintaining the upper and lower dogs of the inner central roll 15 in the inner space of the rectangular structure. In FIG. 5, the above-mentioned gradual joining is shown in five steps (1 to ⑤) including the side guide rolls ①, but the number of steps can be arbitrarily set as long as the workpiece can be molded perfectly without difficulty. When using a thin iron can be joined by one center roll ⑤, but generally 2 to 5 center rolls are preferred.

As described above, according to the steel rolling molding method of the present invention, a metal tube or the like can be manufactured in a predetermined shape by joining in a uniform process using a roll forming machine, and in particular, a tube having various cross-sectional shapes as well as a circular tube can be economically manufactured. It can manufacture.

Therefore, the present invention not only shortens the production process, but also improves the quality of the product and replaces the welding method with the joining method, and conventionally, it is not necessary to perform separate galvanizing due to the welded part of the finished product. However, in the present invention, the product can be completed in the state of galvanizing the iron plate.

In particular, the U-shaped studs used for building dry walls should be used in the form of an L-shape, a T-shape, a + -shape and a two-shape in a U-shape around a door frame or window frame, but in the method of the present invention. One square tube manufactured by the stiffener is sufficient for the brace material, which is firm against the vertical force of the product, compensating for the cracking at the joint of the finishing material, and shortening the process by increasing the quantity and quality at the finishing.

Claims (3)

A plurality of rolls in which individual patterns are formed on each roll surface are sequentially arranged in a series of roll stands so that the workpiece strip can be sequentially processed in a specific form by a roll driving force between the upper and lower rolls 11 and 12. In the steel rolling forming method for forming into a shape, while the iron sheet strip is advanced between the rolls in the first half of the plurality of upper and lower rolls (11, 12) to gradually bend the workpiece to give a predetermined outer shape Bending both edges of the joint to face each other and sequentially bending the surface having the upper bent portion of the junction to be disposed below the surface having the downward bent portion; In the latter half of the plurality of upper and lower rolls (11, 12) is installed in the first half of the roll stand in the opening step of the workpiece, the center is recessed on the upper surface connected to the workpiece progress direction to the longitudinal rod connected to the crossbar A rectangular structure having a roll 15 is fixedly installed to allow the workpiece to pass between the central roll 15 and the outer top and bottom rolls 11 and 12 so that the workpiece passes around the central roll 15 of the rectangular structure. And joining by pushing up a surface having an upper edge bent portion disposed in the lower portion while advancing the wrapping, wherein the center roll has a groove for receiving and adhering the joint portion. The roll forming method according to claim 1, wherein four central rolls are arranged in the rectangular structure. The method of claim 1, wherein the rolling of the non-junction tube for installing the support portion 16 for accurately maintaining the vertical gap of the inner central roll 15 in the inner space of the rectangular structure in which the inner central roll 15 is disposed. Molding method.