KR100761054B1 - Device for forming thick tube and the method thereof - Google Patents

Abstract

A device and a method for forming a thick tube, which increase the manufacturing efficiency of the thick tube, secure the safety of workers, and increase the completeness of a product by simplifying the manufacturing process of the thick tube and efficiently manufacturing the thick tube at the same time, and can bend both end portions of a steel sheet by rotating side rollers and a lower roller using power, are provided. A device for forming a thick tube comprises: an upper roller(2) rotatably pressing a central portion of a steel sheet(1); a frame(5) which is liftable and lowerable, presses the upper roller such that the upper roller presses and bends the central portion of the steel sheet, or presses bent both ends of the steel sheet; a lower roller(4) rotatably supporting the central portion of the steel sheet pressed by the upper roller from a lower side of the upper roller; and a pair of rotatable side rollers(3) respectively installed at both sides of the upper roller to bend both ends of the steel sheet pressed by the upper roller. The upper roller has a plurality of bearings(21) embedded in both end portions thereof such that the bearings make it easy to separate the thick tube from the upper roller when separating a thick tube formed around the upper roller from the upper roller. The frame has a frame concave face(51) formed on the bottom thereof such that the frame concave face directly contacts with the upper roller or the thick tube.

Description

Device for forming thick tube and the method

1 is a perspective view showing a thick tube forming apparatus according to an embodiment of the present invention.

Figure 2 is a perspective view showing the chamfering method of the thick tube forming apparatus according to another embodiment of the present invention.

Figure 3 is a perspective view showing a method of correcting the roundness of the thick tube by the roundness correction roller of the thick tube forming apparatus according to another embodiment of the present invention.

Figure 4 is a flow chart of the molding method of the thick tube forming method according to the present invention.

5a to 5b is a perspective view and a front view showing a steel sheet bending method by the upper roller of the thick tube forming apparatus according to the present invention.

6a to 6b is a perspective view and a front view showing a steel sheet bending method by the side roller and the lower roller of the thick tube forming apparatus according to the present invention.

Figure 7 is a perspective view showing the temporary welding by the upper roller of the thick tube forming apparatus according to the present invention.

8 is a perspective view showing a thick tube molded by a thick tube forming apparatus according to the present invention.

* Key descriptions of the main parts of the drawings *

1: steel plate 1 ': thick tube

2: upper roller 21: bearing

3: side roller 4: lower roller

5: frame 51: frame concave surface

6: chamfering roller 7: roundness correction roller

The present invention relates to a thick tube forming apparatus and a method for forming a thick tube by transforming the plate-like steel sheet material supplied to the thick tube forming apparatus into a circular cross-sectional shape through a sequential process of the rotation and pressing of the bending roller.

Conventionally, the iron plate was bent by rollers to produce a circular tube, but it is almost impossible to manufacture a thick tube in this manner. In other words, in order to make a pipe with a thickness of 80mm and a diameter of 700mm with a bending machine, the diameter of the roller must be at least 600 ~ 700mm. Therefore, in order to make the pipe of the above specifications into a bending roller, the bending roller must have sufficient dimensions in strength. It can bend without breaking. Therefore, if the diameter of the bending roller is small, the bending roller is broken or bent, so that a proper pipe cannot be made.

Korean Utility Model Registration No. 20-0297720 for this has been disclosed a device for producing a circular tube by molding a steel plate having a thick thickness of more than 70mm ~ 80mm in a press. It is a device that can make a tube by using a large-capacity press. It is a round bar of steel plate which is made of round tube and moves from both ends to the center with round bar of pusher. When completed, insert the circular tube into the upper and lower jig, and then repeatedly stiffen the tube by vertical movement of the upper jig so as to form an accurate circle so that the tube becomes a whole circle. However, in the conventional case described above, the user's safety problem due to the repeated pressing operation of the pusher and the compaction operation of the upper jig, the productive efficiency deterioration due to the complicated process, and the product completeness were inferior.

The present invention has been made to solve the above problems, an object of the present invention is to simplify the manufacturing process of the thick tube and to efficiently produce the thick tube by increasing the manufacturing efficiency of the thick tube and the worker It is to provide a thick tube forming apparatus and molding method that can protect the safety of the product and increase the completeness of the product.

Still another object of the present invention is to provide a thick pipe forming apparatus and a molding method capable of bending both ends of a steel plate by rotating by using the power of the side roller and the lower roller.

Another object of the present invention is that when the upper roller is lowered to bend the center portion of the steel sheet, the center point of the lowered upper roller is located at a lower position than the center point of the side roller, so that both ends of the steel sheet bent at the center portion are supported by the side rollers. It is to provide a thick tube forming apparatus and a molding method that can suppress the repulsive force.

Still another object of the present invention is to provide a thick tube forming apparatus and a molding method capable of forming thick tubes having various diameters by moving the side rollers and the lower rollers from side to side and up and down, respectively.

Another object of the present invention, by having a circular upper roller and a frame for pressing the upper roller by the upper frame is lowered due to the pressing of the frame thick tube forming apparatus and molding method that can be bent in the center portion of the steel sheet to the curved surface To provide.

Another object of the present invention, when the upper roller is lowered to bend the center portion of the steel sheet, the center point of the lowered upper roller is located at a lower position than the center point of the side roller, so that the bending of both ends of the steel sheet by the rotation of the side roller It is to provide a thick pipe forming apparatus and a molding method that can be easily.

It is still another object of the present invention to provide a thick tube forming apparatus and a molding method for facilitating welding of a steel sheet by chamfering the edge portions of the steel sheet by chamfering rollers when welding both edge portions of the thick tube.

Another object of the present invention, the thick tube is passed along the guide groove of the round calibration roller, the guide groove presses the outer peripheral surface of the thick tube to correct the roundness of the thick tube to increase the completeness of the product and It is to provide a molding method.

The thick tube forming apparatus and forming method for achieving the above object of the present invention includes the following configuration.

According to the first embodiment of the present invention, in the thick pipe forming apparatus and the molding method of the present invention, an upper roller for pressing a central portion of the steel sheet and a side roller for bending both ends of the steel sheet pressed by the upper roller And, it characterized in that it comprises a lower roller for supporting the molding process by the above configuration.

According to the second embodiment of the present invention, in the thick tube forming apparatus and the molding method of the present invention, the upper roller is separated from the thick tube when the thick tube formed around the upper roller is separated from the upper roller. To facilitate this, it characterized in that it comprises a plurality of bearings at each end of the upper roller.

According to a third embodiment of the present invention, in the thick tube forming apparatus and the molding method of the present invention, the side rollers are moved left and right according to the size of the steel sheet so that the steel sheet can be molded into thick tubes of various sizes. Characterized in that.

According to the fourth embodiment of the present invention, in the thick pipe forming apparatus and the molding method of the present invention, the side rollers may support both ends of the steel sheet to suppress the repulsive force of the steel sheet in which the central portion is bent. The center point of the side roller is characterized in that it is located higher than the center point of the upper roller.

According to a fifth embodiment of the present invention, in the thick pipe forming apparatus and the molding method of the present invention, the upper roller is characterized in that the rollers of various sizes are formed so that the steel sheet can be formed into thick tubes of various sizes. It is done.

According to a sixth embodiment of the present invention, in the thick pipe forming apparatus and the molding method of the present invention, the upper roller is located on the upper side of the upper roller and is in close contact with the upper roller to bend the central portion of the steel sheet. It is characterized in that it comprises a frame for pressing.

According to the seventh embodiment of the present invention, in the thick tube forming apparatus and the molding method of the present invention, the thick tube forming apparatus, both side walls are inclined to form a slanted surface chamfering roller for chamfering the edge portion of the steel sheet Characterized in that it further comprises.

According to an eighth embodiment of the present invention, in the thick tube forming apparatus and molding method of the present invention, the thick tube forming apparatus. It characterized in that it further comprises a roundness correction roller for correcting the roundness of the thick tube.

According to a ninth embodiment of the present invention, in the thick pipe forming apparatus and the molding method of the present invention, the step of bending the central portion of the steel sheet by lowering the upper roller, and the side roller and the lower roller rotate while moving left and right, respectively And bending the left and right ends of the steel plate, the center portion of which is bent, and forming a thick tube through the above process, and the upper roller descends to fix the thick tube and temporarily weld.

Hereinafter, with reference to the accompanying drawings a preferred embodiment of a thick tube forming apparatus and a molding method according to the present invention will be described.

1 is a perspective view showing a thick tube forming apparatus according to an embodiment of the present invention.

Referring to FIG. 1, both ends of an upper roller 2 having a length wider than the width of the steel sheet 1 and bending the central portion of the steel sheet and the central portion bent by the upper roller 2 are bent. A side roller (3), a lower roller (4) for bending both ends of the steel plate (1) at the center portion of which is bent by the upper roller (2) together with the side roller (3), and the upper roller (2) It includes a frame 5 located on the upper side of the.

Here, the steel sheet 1 is a molding material for forming the thick tube 1 '(see FIG. 8) and finally using the thick tube 1' (see FIG. 8) forming apparatus and forming method according to the present invention. It is made of a material that can meet the size and hardness required for the molded thick tube (1 ', see Fig. 8), and a separate processing process at both ends of the molded thick tube (1', see Fig. 8) It is preferable to use a molding material made of a square plate shape so as not to be performed.

The upper roller 2 is formed by a rectangular rod having a length wider than the width of the steel sheet 1, and is lowered by the pressing of the frame 5 to be described below, along the curved surface of the upper roller 2. The central portion of the steel sheet 1 is to be bent in a curved shape, preferably a semicircular shape. In addition, it is also possible to use the upper roller (1) of various diameters to manufacture a thick tube (1 ', see Figure 8) having a variety of diameters, and includes a bearing (21).

5 to 6 bearings 21 are formed around both ends of the upper roller 2, and the steel plate 1 is formed in a thick tube (1 'FIG. 8) formed around the upper roller 2. ) Is separated from the upper roller (2) in contact with the inner surface of the steel sheet (1) to facilitate the separation of the steel sheet (1) by the rotation of the bearing (21). The bearing 21 may also use a known bearing 21.

1 and 5B, the side roller 3 is formed of a rectangular rod having a length wider than the width of the steel sheet 1, and the center roller of the steel plate 1 is formed by the upper roller 2. Supports the pressing force of the upper roller (2) and the steel sheet (1) when bending, and the center point B of the side roller (3) is the center point of the lowered upper roller (2) when the central portion of the steel sheet (1) is bent Located at a position higher than A and supporting both ends of the steel sheet 1 bent at the center by the upper roller 2, the both ends of the steel sheet 1 can be suppressed from spreading in the C and D directions, respectively. And it is easy to bend both ends of the steel sheet by the rotation of the side roller (3).

This is because both ends of the steel sheet (1) in which the central portion is bent are to be restored in the C, D direction, respectively, so that the center point A of the upper roller (2) is higher than or equal to the center point B of the side roller (3) When positioned, both ends of the steel sheet 1 cannot be supported by the side rollers 3 so that both ends of the steel sheet are attempted to extend in the C and D directions, respectively. In addition, the bending point is fixed by the upper roller 2 in the steel sheet 1, which is bent at the center thereof, and the pressing point applied by the rotation of the side roller 3 is a force point F. When the end of the steel sheet 1 is called the working point G, the longer the distance between the supporting point (E) and the force point (F), the larger the force of the lever can be considered, the principle of lever side roller (3) The side roller (3) is higher than the upper roller (2), the supporting point (E) of the bending point is fixed by the upper roller (2) is a force point (F) applied by the rotation of the side roller (3). It can be seen that bending of both ends of the steel sheet 1 due to the rotation of) is easy.

In addition, before the upper roller 2 presses and bends the center of the steel sheet 1, the distance between the side rollers 3 may be increased by the width of the steel sheet 1 to support the steel sheet 1. In order to manufacture a thick tube 1 '(see FIG. 8) having various diameters, the side rollers 3 may move from side to side according to the diameter of the thick tube 1' (see FIG. 8).

The lower roller 4 is formed of a rectangular rod having a length wider than the width of the steel sheet 1, and the upper roller 2 has the steel sheet 1 bent at the center thereof by the upper roller 2. The lower roller (4) to fit the diameter of the thick tube (1 ', see Figure 8) to be able to limit the falling by the pressurization, and to produce a thick tube (1', see Figure 8) having a variety of diameters. ) Can move up and down.

Here, the side roller (3) and the lower roller (4) has a power to bend both ends of the steel sheet 1, the center portion is bent by the upper roller (2) by rotation, the upper roller The side rollers 3 and the lower rollers 4 are in close contact with the circumference of the steel sheet 1 enclosed in a semicircular shape around (2) so that the side rollers 3 and the lower rollers 4 are clockwise. When rotated, the upper roller 2, which is surrounded by the steel plate 1 and is non-powered, rotates counterclockwise, and when the side roller 3 and the lower roller 4 rotate counterclockwise, The upper roller 2 is rotated in the clockwise direction so that both ends of the steel sheet 1 formed between the upper roller 2 and the side roller 3 are the upper part due to the pressing force caused by the rotation of the side roller 3. It can be bent along the curved surface of the roller (2).

The frame 5 is located above the upper roller 2 and presses the upper roller 2 when the upper roller 2 bends the center portion of the steel sheet 1 so that the upper roller 2 can be lowered. The lower part of the frame 5 includes a frame concave surface 51 which is in direct contact with the upper roller 2 or the thick tube 1 ′ (see FIG. 8).

The frame concave surface 51 is formed as a semicircular concave surface at the lower surface of the frame 5 and the upper roller 2 while the frame 5 descends from the upper side to the lower side to press the upper roller 2. A) direct contact with the press to bend the central portion of the steel sheet (1). The diameter of the frame concave surface 51 has a size corresponding to the diameter of the thick tube 1 '(see FIG. 8) and the frame concave of various diameters so as to produce a thick tube 1' (see FIG. 8) of various sizes. It is also possible to use the face 51.

In addition, the frame concave surface 51, after the upper roller 2 bends the central portion of the steel sheet 1 by the pressing of the frame 5, the frame 5 is raised to its original position and the upper portion When the steel sheet 1 is bent into the shape of the thick tube 1 '(see Fig. 8) by the roller 2, the side roller 3, and the lower roller 4, it is lowered again and the thick tube 1', FIG. The upper roller 2 is rotated by the side roller 3 so that both ends of the steel sheet 1 are rotated by the side of the frame 5. It is located between one side of the side and the side roller (3) to facilitate the temporary welding.

Then, the temporary work is finished by bending the steel plate 1 by the rotation of the side roller 3 and the lower roller 4 and pressing the frame 5, and the thick pipe (see 1 '8). When leaving the steel sheet 1 formed in the shape of the side rollers 3 may move left and right, respectively, and fall from the steel sheet 1, but is molded in the shape of a thick tube 1 '(see FIG. 8). The upper roller 2 formed inside the steel sheet 1 has both ends of the steel sheet 1 closed and cannot be separated from the upper side, so that the bearing 21 faces toward the front or the rear of the steel sheet 1. It should be separated by the rotation of.

Meanwhile, according to another embodiment of the present invention, the steel sheet 1 before bending the steel sheet 1 to be easily welded after bending the steel sheet 1 in the shape of a thick tube 1 ′ (see FIG. 8). After chamfering the roller 6 and the steel sheet 1 in the shape of a thick tube 1 ', see FIG. 8 so as to create a chamfered surface at the edge portion of the thick tube 1', see FIG. It further includes a round calibration roller (7) to correct the roundness of the will be described in detail with reference to Figures 2 to 3 below.

Figure 2 is a perspective view showing the chamfering method of the thick tube forming apparatus according to another embodiment of the present invention, Figure 3 is a thick tube by the round calibration roller of the thick tube forming apparatus according to another embodiment of the present invention This is a perspective view showing how to correct the roundness of a.

Referring to FIG. 2, the chamfering roller 6 has a length wider than the width of the steel sheet 1 and includes a chamfering generating roller 61 and a supporting roller 62.

The chamfering roller 61 is to chamfer the edge portion of the steel sheet 1 when the steel sheet 1 is finally made into a thick tube (not shown) and welded a plurality of thick tubes (not shown) It is to create the chamfered surface 11 at the edge portion to facilitate welding of the welded portion of the thick tube (not shown) when the slab and the width corresponding to the width of the steel sheet (1) and the thickness of the steel sheet (1) The depth of the chamfering generating roller 61 is formed around the chamfering groove 611 and the chamfering slope 612.

The chamfering groove 611 is chamfered to a depth approximately equal to the width of the steel sheet 1 and the thickness of the steel sheet 1 so that the steel sheet 1 can pass through the chamfering roller 6. It is formed around the production roller 61.

The chamfering inclined surface 612 is a portion which directly chamfers the edge portion of the steel sheet 1, and is fixed at both sides of the chamfering groove 611 by a depth corresponding to the thickness of the steel sheet 1 from inside to outside. By inclining the furnace, the chamfered surface 11 corresponding to the chamfering slope 612 is formed at the edge portion of the steel sheet 1.

The support roller 62 is positioned below the chamfering roller 61 to support the weight of the steel sheet 1 and the pressing force of the chamfering roller 61, and the chamfering roller 61 ) And the steel sheet 1 by the rotation of the support roller 62.

On the other hand, according to another embodiment of the present invention, the feed direction of the chamfering roller 6 is a number of thick pipes (not shown) easily after the steel sheet 1 is finally made into a thick pipe (not shown) The steel sheet 1 was transferred to the H surface so that the chamfered surface 11 could be generated in front and rear of the thick tube (not shown), but the steel sheet 1 was made of a thick tube (not shown). In the process, the I side or the J surface of the steel sheet 1 is chamfered groove 611 of the chamfering roller 6 so that the edge portion of one side of the thick pipe (not shown) and the edge portion of the other side are easily welded to each other. It is also possible that the chamfered surface 11 is generated on the H surface and the K surface.

Referring to FIG. 3, the round calibration rollers 7 are formed in pairs to form a circular shape of the thick tube 1 ′ formed through the above configuration into a more precise circle shape. And includes a guide groove (71).

The guide groove 71, the center portion of the circular calibration roller (7) is formed in the concave surface of the curved surface of the inside is formed around the same size as the circumference of the thick tube (1 ') and both The space defined by the guide groove of the passage has an elaborate round shape. When the thick pipe 1 'passes, the round calibration roller 7 rotates around each round shaft 72 so that the thick pipe ( 1 ') roundness can be corrected.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of the molding method of the thick tube (1 ', see Figure 8) according to the present invention will be described in detail.

Figure 4 is a flow chart of the molding method of the thick tube forming method according to the present invention, Figures 5a to 7 are a front view and a perspective view showing a molding method of a thick tube according to the present invention, Figure 8 is a thick tube according to the present invention It is a perspective view which shows the thick tube shape | molded by the shaping | molding apparatus.

Referring to Figure 4, thick tube forming method according to the present invention, the central portion bending step (S1) for bending the central portion of the steel sheet 1 due to the pressing of the upper roller 2 and the frame 5, Left and right bending step (S3) for bending both ends of the steel sheet 1, the center portion is bent by the upper roller (2) and the frame (5), and the frame is temporarily lowered to the bending steel plate by the above process The welding step (S5), and both ends of the steel sheet (1) bent by the above process, and the end of both ends welding step (S7) to form a thick tube (1 ').

4 and 5a to 5b, the central bending step S1 may include an upper roller 2 having a frame 5 formed of a rectangular rod having a length wider than that of the steel sheet 1. By pressurizing, the upper roller 2 is lowered to one side of the central portion of the steel sheet 1 made of a thick plate, and the side rollers 3 are supported on the other end surfaces of both ends of the steel sheet 1, respectively. Frame concave surface 51 having various diameters to be bent in a curved shape, preferably semi-circular shape along the curved surface of the upper roller 2, and to produce a thick tube 1 ', see FIG. And the upper roller (2) to be used.

Here, when the central portion of the steel sheet 1 is bent, the center point B of the side roller 3 is located higher than the center point A of the lowered upper roller 2 so that the center portion is bent by the upper roller 2. By supporting both ends of the steel sheet 1, it is possible to suppress the repulsive force that both ends of the steel sheet 1 is to be extended in the outward direction, which means that both ends of the steel sheet 1, the center portion is bent, respectively, C, When the center point A of the upper roller 2 is located higher than or equal to the center point B of the side roller 3, the both ends of the steel sheet 1 are moved to the side roller 3. Since the center point B of the side roller (3) is not higher than the center point A of the lowered upper roller (2) to be supported by. In addition, before the upper roller 2 presses and bends the center of the steel sheet 1, the distance between the side rollers 3 may be increased by the width of the steel sheet 1 to support the steel sheet 1. To allow the side rollers 3 to move from side to side according to the diameter of the thick tube 1 '(see FIG. 8) so as to manufacture thick tube 1' (see FIG. 8) having various diameters. The lower roller (4) to move up and down in accordance with the diameter of the tube (1 ', see Figure 8).

4 and 6A to 6B, the left and right bending step S3 is a step of bending both ends of the steel sheet 1 in which a central portion is bent by the upper roller 2 and the frame 5. The side rollers 3 and the lower rollers 4 formed of a rectangular rod having a length wider than the width of the steel sheet 1 are formed at both ends of the steel sheet 1, the center of which is bent by the upper roller 2. The side rollers 3 and the lower rollers 4 are closely attached to the circumference of the steel sheet 1 enclosed in a semicircle shape around the upper roller 2 and have power so as to be bent by rotational force. When the roller 3 and the lower roller 4 rotate in a clockwise direction, the upper roller 2, which is enclosed by the steel plate 1 and is non-powered, rotates in a counterclockwise direction, and the side roller 3 and the lower portion thereof. When the roller 4 rotates counterclockwise, the upper roller 2, which is non-powered, Both ends of the steel sheet 1 formed between the upper roller 2 and the side roller 3 by rotating in the direction are connected to the upper roller due to the pressing force caused by the rotation of the side roller 3 and the lower roller 4. Allow bending along the surface of 2).

In this case, when the central portion of the steel sheet 1 is bent, the center point B of the side roller 3 is located above the center point A of the lowered upper roller 2 so that the center of the steel sheet 1 is bent at the center point B. Support point (E) is the point where the bending is fixed by the upper roller (2), the pressure point applied by the rotation of the side roller (3) the force point (F), the end of the steel sheet (1) working point (G) When the distance of the force point (F) from the supporting point (E) is a force point (F) applied by the rotation of the side roller (3) by using the principle of lever can be produced a large force even with a small force The higher the center point B of the side roller 3 is higher than the center point A of the upper roller 2, which is the support point E at which the bending is fixed by the upper roller 2, the steel sheet by the rotation of the side roller 3 ( Make it easy to bend both ends of 1).

4 and 7, the temporary temporary step S5 may include the frame 5 after the upper roller 2 bends the central portion of the steel sheet 1 by pressing the frame 5. ) Is raised to its original position and is lowered again when the steel sheet 1 is bent into the shape of a thick tube 1 '(see FIG. 8) by the upper roller 2, the side roller 3, and the lower roller 4 The frame 5 is in close contact with the upper circumferential side of the steel sheet 1 bent in the shape of a thick tube 1 ′ (see FIG. 8), and to easily perform temporary welding on both ends of the steel sheet 1. The upper roller 2 is rotated by the side roller 3 and the lower roller 4 so as to be positioned between the side roller 3 and the side roller 3, and temporary contact is possible by fixing the frame recess 51. Make sure

4 and 8, the both end welding step (S7) is a step of welding both ends of the steel sheet 1 bent in the shape of the thick tube (1 ') the above process. After bending the steel sheet 1 in the shape of a thick tube 1 'by the upper roller 2, the side roller 3, and the lower roller 4, both ends of the steel sheet 1 are welded to each other. Complete the thick tube 1 '.

Another embodiment of the present invention will be described with reference to FIG. 2, before bending the steel sheet 1 into the shape of a thick tube 1 ′ (see FIG. 8), before bending the steel sheet 1 to facilitate welding. The method further includes a step of forming a chamfer surface so as to generate the chamfered surface 11 at the edge portion of the steel sheet, wherein the steel sheet 1 made of a thick plate passes through the chamfering roller 6. The chamfering surface 612 of the production roller 61 is to chamfer the J surface and the I surface of the steel sheet 1 to produce the chamfered surface 11. The chamfering surface 11 is formed when the steel sheet 1 is finally made of a thick tube 1 '(see FIG. 8), and is connected to a plurality of thick tubes 1' (see FIG. 8) by welding. 1 ', so as to facilitate the welding of the welding portion of the (8), and to prevent the weld line from protruding from the end surface of the pipe, the direction in which the chamfered surface 11 is formed, the steel sheet 1 is a thick tube (1') 8, the J surface or the I surface of the steel sheet 1 so that the edge portion of one side and the edge portion of the other side can be easily welded to each other. The chamfering surface 11 may be formed on the H surface and the K surface by being transferred to the chamfering groove 211 of the roller 2, and the process may be performed at the same time.

Referring to another embodiment of the present invention with reference to Figure 3, and further comprising a roundness correction step before the temporary welding step and the welding step, the center portion of the roundness correction roller (7) is formed in a round shape The inside of the portion is formed around the same size as the circumference of the thick tube (1 ') and when the passage of the thick tube (1') the roundness correction roller (7) centering around each round shaft (72) By rotating it to be able to correct the roundness of the thick tube (1 ').

The present embodiment is only a preferred embodiment so that those skilled in the art to which the present invention pertains can easily carry out the thick tube forming apparatus and the molding method according to the present invention, and thus the scope of the present invention is limited. It is apparent that parts that can be easily changed by those skilled in the art are included in the scope of the present invention.

The present invention can achieve the following effects by the above configuration and molding method.

The present invention, by simplifying the manufacturing process of the thick tube and at the same time to efficiently produce the thick tube can increase the manufacturing efficiency of the thick tube can protect the safety of the operator and improve the completeness of the product You can get it.

The present invention can achieve the effect of bending both ends of the steel sheet by rotating by using the power of the side roller and the lower roller.

According to the present invention, when the upper roller is lowered and the center portion of the steel sheet is bent, the center point of the lowered upper roller is located below the center point of the side roller, so that both ends of the steel sheet bent at the center portion are supported by the side rollers to suppress the repulsive force. It can have an effect.

The present invention can achieve the effect of forming a thick tube of various diameters by moving the side roller and the lower roller to the left and right and up and down, respectively.

According to the present invention, the upper roller having a circular shape and the frame pressurizing the upper roller may have an effect of bending the upper roller to descend due to the pressing of the frame to bend the central portion of the steel sheet to the curved surface.

According to the present invention, when the upper roller is lowered and the center portion of the steel sheet is bent, the center point of the lowered upper roller is located at a lower position than the center point of the side roller, so that bending of both ends of the steel sheet due to the rotation of the side roller can be facilitated. Can achieve the effect.

The present invention, when welding the edges of both ends of the thick tube may be chamfered by the chamfering roller edge portion of the steel sheet can have the effect of facilitating the welding of the steel sheet.

According to the present invention, the thick tube passes along the guide groove of the round calibration roller, and the guide groove pressurizes the outer circumferential surface of the thick tube to correct the roundness of the thick tube and increase the completeness of the product.

Claims (10)

Rotatable upper roller for pressing the central portion of the steel sheet, A lifting frame capable of pressing the upper roller or pressing the bent ends of the steel sheet so that the upper roller presses the center portion of the steel sheet to bend; A rotatable lower roller supporting a central portion of the steel plate pressed by the upper roller at the lower side of the upper roller; A pair of rotatable side rollers each provided on both sides of the upper roller to bend both ends of the steel sheet pressed by the upper roller, The upper roller is in contact with the pair of side rollers on the side and the lower roller on the lower side with the steel plate bent in the center portion, the upper roller which is pressed against the pair of side rollers rotate when the opposite Direction and the lower roller which is in pressure contact with the upper roller is rotated in the same direction as the rotation direction of the side roller, so that the bent steel plate is firmly sandwiched between the upper roller, the side roller and the lower roller Both ends of the steel sheet is bent in accordance with the sequential forward and reverse rotation of the rollers to form a thick tube forming apparatus characterized in that the circular tube. The method of claim 1, wherein the upper roller, The thick pipe forming apparatus characterized in that it comprises a plurality of bearings at each end of both sides of the upper roller to facilitate the separation of the thick tube when the thick tube formed around the upper roller is separated from the upper roller. The method of claim 1, wherein the side rollers, The thick pipe forming apparatus, characterized in that for moving the steel plate to the left and right according to the size of the steel sheet to be formed into a thick tube of various sizes. The method of claim 3, wherein the side rollers, And a center point of the side roller is positioned higher than a center point of the upper roller so as to support both ends of the steel sheet in order to suppress the repulsive force of the steel sheet having a central portion bent. The method of claim 1, wherein the upper roller, The thick pipe forming apparatus, characterized in that the roller is formed of various sizes so that the steel sheet can be formed into thick tubes of various sizes. The method of claim 1, wherein the upper roller, Located in the upper side of the upper roller thick tube forming apparatus comprising a frame for pressing in close contact with the upper roller to bend the central portion of the steel sheet. The thick tube forming apparatus according to any one of claims 1 to 6, Both side walls are inclined to form a slanted surface thickening apparatus, characterized in that it further comprises a chamfering generating roller chamfering the edge portion of the steel sheet. The thick tube forming apparatus according to any one of claims 1 to 6, wherein the thick tube forming apparatus is used. The thick tube forming apparatus, characterized in that it further comprises a roundness correction roller for correcting the roundness of the thick tube. The frame by using the thick tube forming apparatus according to any one of claims 1 to 6 by pressing the upper roller to the lower side and moving the side roller and the lower roller in the direction of the upper roller sequentially A central bending step of bending the central portion of the steel sheet by press-contacting the upper roller, the pair of side rollers and the lower roller with the steel sheet interposed therebetween when the upper roller bends the central portion of the steel sheet; The upper roller is in contact with the pair of side rollers and the lower roller at the lower side on both sides with the steel plate bent in the center portion, the upper roller is in contact with the opposite direction when the pair of side rollers rotate The lower roller, which rotates and press-contacts the upper roller, rotates in the same direction as the rotational direction of the side roller, so that both ends thereof are sequentially inserted with the steel plate bent centrally between the upper roller, the side roller, and the lower roller. Left and right bending step of bending to form a circular tube, The frame is lowered by pressing the bent both ends of the steel sheet by pressing the temporary welding step to easily fix the thick tube, and then temporarily temporary welding, The thick tube is a thick tube forming method, characterized in that supported by the upper roller from the inside. The method of claim 9, wherein the thick tube forming method, Thickening surface forming step further comprises the step of chamfering the surface chamfered edge portion of the steel sheet.

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