KR101885601B1 - Main roll of ring rolling mill for manufacturing a weld neck flange - Google Patents

Abstract

The present invention improves a flange unit forming roll of a conventional butt welded flange-making ring rolling apparatus having a forming unit composed of the upper surface, the lower surface and the inner end surface, and being rotated by a rotary shaft. Therefore, in the present invention, the flange unit forming roll is constituted by an upper roll and a lower roll which are divided into upper and lower portions around one point on the inner end surface of the forming unit. With the above configuration, when wear of the flange unit forming roll is locally worn, the boundary surface between the upper roll and the lower roll is cut to the same size even if the forming unit is cut to a desired size. Therefore, since the present invention can maintain a first standard of the forming unit, the flange unit forming roll can be used repeatedly.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a flange forming roll for a ring rolling apparatus for manufacturing a butt welded flange,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flange forming roll used in a ring rolling apparatus for manufacturing a weld neck flange, and more particularly to a forming roll which can be used repeatedly.

The flange is used to connect pipes and tubes of constant diameter and length to create a continuous flow path for the fluid. Currently commonly used flanges are slip-on welding flanges, which are completely inserted into the flange and welded to it. Some insert welds are used, A socket welding flange, a threaded flange for threading the flange inside and outside the tube, and a weld neck flange for connecting the flange to the tube by butt welding or high hub flange.

Butt welded flanges are used in harsh environments where high temperatures, pressures or stresses are required. 1, a butt welded flange 1 has a neck 5 and a flange 3 having a bore 7 of the same inner diameter as the tube to be connected at the center And a bolt hole 9 for bolt-type fastening with another flange 1 is formed in the flange portion 3. [ The butt welded flange is relatively expensive to manufacture because it requires a separate process to form the neck.

A flange having a small neck with a bore size of 5 inches or less is manufactured by forging and turning a round bar, while a flange having a large neck is manufactured by hot pressing. As shown in Fig. 2, the flange having a large neck is produced by first forming a rectangular columnar base material 10 made of a material for a flange (low alloy carbon steel, stainless steel, nonferrous metal, etc.) at a predetermined temperature And then pressurized by a press machine 20 composed of an upper press 22 and a lower press 24 to form a primary preform in the form of a plate having a predetermined thickness, (12).

Next, as shown in Fig. 3, the neck is formed by using the neck forming press 26 formed with the neck forming groove 25 and the neck forming punch 30. Next, as shown in Fig. The punch 30 has a neck forming portion 32 having a shape corresponding to the shape of the neck forming groove 25 at the lower portion thereof. The neck is formed by replacing the lower press 24 of the press machine 20 with a neck press 26 to position the primary preform 12 thereon and placing the punch 30 on the preform 12 And then pressing the punch 30 with the upper press 22 of the press. Once the neck 5 'is formed, the punch 30 is removed and then pressed against the upper press 22 of the press to produce the flange 3' having the desired thickness. Thus, the secondary preform 14 having the neck 5 'and the flange portion 3' is obtained.

Next, as shown in Fig. 4, the secondary preform 14 is turned upside down on the neck forming press 26, and the punch 40 for forming the bore is placed at the bore forming position of the secondary preform 14 (Final) preform 16 is produced by pressing the upper press 22 of the press machine to form the bore 7 '. Korean Patent No. 10-1061574 discloses another method for manufacturing a third preform.

The thus formed tertiary preform includes a pair of axial rolls 91 and 92, a mandrel 94 and a main roll, that is, a flange forming roll 100, as shown in Fig. And is formed into a flange in a ring rolling mill 90 constituted by a ring rolling mill. First, after the third preform 16 is heated again to an appropriate temperature (for example, usually in the range of 1200 to 1250 ° C in the case of a steel material), the flange portion 3 'of the third preform 16 is heated by a ring- 90 and the mandrel 94 is placed in the bore 7 'to perform the ring rolling. The mandrel 94 is placed in the forming portion 103 of the side of the flange forming roll 100 in FIG. The pair of rollers 91 and 92 positioned above and below are rotated in opposite directions to compress the preform 16 to a predetermined height and the mandrel 94 is rotated while rotating the bore 7 ' The preform is pressed outwardly along the periphery to expand the bore 7 'to have a predetermined inner diameter. This pressing of the mandrel 94 causes the end of the flange portion 3 'of the tertiary preform positioned in the forming portion 103 of the flange forming roll to move along the upper surface 106, the lower surface 104, And has a width w and a height h of the forming portion 103 composed of the side surface 105. [ The flange forming roll 100 is made of carbon steel such as alloy steel or S45C or SCM440 and is joined to the rotating shaft 99 in a key and keyway coupling manner as is well known to those skilled in the relevant art Thereby rotating the preform 16 while rotating.

The flange obtained through the ring rolling in the annular rolling apparatus is formed with a bolt hole by drilling and becomes a flange having a final dimension through finishing (cutting) processing.

The forming portion 103 of the flange forming roll 100 of the annular rolling apparatus wears over time and this wear proceeds locally (generally the wear at the inlet of the forming portion is largest and the smallest at the inner end face). Local wear results in non-uniformity of the height h of the forming part 103, which is calibrated by finishing the flange obtained through annular rolling. If the localized wear is increased, the burden on the finishing process at the subsequent stage is increased, and the flange forming roll 100 must be replaced because it causes waste of the material. Since the forming roll 100 is very expensive, it is highly desirable that the forming portion 103 can be recycled even if local wear of the forming portion 103 progresses.

Korean Patent No. 10-1335651 (Announcement of Mar. 13, 2013)

It is an object of the present invention to provide a flange forming roll capable of correcting and reusing this local wear instead of discarding the flange forming roll itself when local wear is advanced in the forming portion of the flange forming roll of the ring rolling apparatus will be.

In order to achieve the above object, the present invention provides a flange forming roll of a ring rolling device for manufacturing a conventional butt welded flange, which has a forming portion composed of an upper surface, a lower surface and an inner end surface, And the support roll is constituted by an upper roll and a lower roll which are divided into upper and lower parts around one point on the inner end surface of the forming part. With this configuration, even when the forming portion of the flange forming roll is locally abraded, even if the forming portion is cut to a desired size, the interface between the upper roll and the lower roll is also cut to the same dimension to maintain the initial size of the forming portion So that the flange forming roll can be used repeatedly.

According to the present invention, the flange forming roll is divided into upper and lower portions about the upper end point of the inner end face of the forming portion, wherein the upper roll is formed with a groove extending upward from the dividing point, Or the flange forming roll is divided into upper and lower parts about the lower end point of the inner end face of the forming part, and the lower roll is provided with a groove extending downward from the dividing point, And the inner end face of the upper roll preferably extends downwardly by the depth of the groove to form a protrusion which is inserted into the groove. This combination of the grooves and the projection of the upper and lower rolls facilitates the engagement of the upper and lower rolls.

According to the present invention, even when the wear of the flange portion forming roll is locally worn, the forming portion can be cut to a desired size without discarding the flange portion forming roll, thereby maintaining the original specification of the forming portion.

The combination of the grooves and the projection of the upper roll and the lower roll according to the present invention facilitates the engagement of the upper and lower rolls.

1 is a schematic view of a butt welded flange.
2 is a schematic view of a process for manufacturing a primary preform of a butt welded flange using a press machine.
3 is a schematic view of a process for manufacturing a secondary preform of a butt welded flange using a neck forming punch device.
4 is a schematic view of a process for manufacturing a third preform of a butt welded flange using a known bore forming punch.
5 is a schematic view of a known ring rolling apparatus.
6 is a cross-sectional view of a flange forming roll according to the present invention used in a ring rolling apparatus.
7 is an exploded cross-sectional view of the flange forming roll shown in Fig.
8 to 11 are cross-sectional views showing other embodiments of the flange forming roll according to the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

The flange forming roll of the present invention is a modification to the conventional flanging roll 100 shown in Figure 5 and is formed on the side of the forming roll 100 and has a top face 106, a bottom face 104 and an inner end face 105 The upper and lower rollers are divided into upper and lower rollers by dividing the inner end face 106 of the forming part 103 constituted by the upper and lower rollers.

6 is a cross-sectional view of a first embodiment of a flange forming roll according to the present invention used in a ring rolling apparatus, and Fig. 7 is an exploded sectional view of the flange forming roll shown in Fig.

The flange forming roll 100 'of the first embodiment divides the conventional flange forming roll 100 shown in Fig. 5 around the upper end point of the inside end face 105 of the forming portion 103, And an upper roll 110 'and a lower roll 110, each having an interface 111' and 111, respectively. At this time, a groove 112 extending upward from the dividing point is formed in the upper roll 110 ', and an inner end face 105' located in the lower roll 110 forms a projection inserted into the groove 112 The length of the groove 112 is equal to the depth of the groove 112. Thus, when the upper and lower rolls 110 ', 110 are coupled along the interface 111, 111, the forming roll 100', consisting of the upper surface 106 ', the lower surface 104' and the inner end surface 105 ' The forming portion 103 'of the forming roll 103 has the same width (w) and height (h) as the conventional forming roll 100 and is the same as the forming portion 103 of the conventional forming roll. This combination of the groove and the projection allows the fastening of the upper and lower rolls to be performed quickly and accurately.

The forming roll 100 'of the illustrated embodiment is formed with a thread groove 120 extending through the upper roll 110' to the lower roll 110 so that the upper and lower rolls 110 'and 110 are screwed . The thread groove 120 is formed to be symmetrically arranged along the perimeter of the through groove 101 into which a rotation shaft for rotating a plurality of forming rolls 100 'is inserted. For example, the number of the threaded grooves 120 may be two or more and ten or less, and six in the illustrated embodiment.

Hereinafter, a description will be given of a method of correcting the wear of the forming portion 103 'of the forming roll 100' of the illustrated embodiment when the wear is progressing locally.

In order to remove the nonuniformity of the height h of the forming part 103 due to the local wear of the forming part 103 of the conventional flange forming roll 100 shown in Fig. 5, If the lower surface 106 and the lower surface 104 are removed by cutting, the size of the forming portion 103 is increased accordingly. For example, when the upper surface 106 and the lower surface 104 are each cut by 1 mm, the height h of the forming portion 103 is increased by 2 mm. This not only increases the burden of finishing at the subsequent stage but also causes a waste of the material, and when the burden becomes excessive, the forming roll 100 must be discarded.

In the case of the forming roll 100 'of the illustrated embodiment, the upper portion 106' and the lower portion 104 'also have the same shape as the forming portion 103' so as to likewise proceed to localized wear in the forming portion 103 ' Cutting is performed in the same manner by 1 mm each along the respective interface faces 111 'and 111 of the upper and lower rolls 110' and 110 at the time of removing by 1 mm each. The groove 112 formed in the upper roll 110 'and the inner end face 105' extending by a length corresponding to the depth of the groove 112 are maintained to be equal to each other, The formed portion 103 'of the forming roll 100' has a width w and a height h before cutting. Therefore, local abrasion is corrected by cutting, and at the same time, the dimensions of the forming part 103 'are kept the same. Since the cutting process for correcting the local wear can be repeatedly performed, the forming roll 100 'can be used repeatedly. On the other hand, when cutting (for example, 1 mm) for progressing the local abrasion on the inner end face 105 'is performed, the outer end faces 113' of the upper and lower rolls 110 ' , 113 are also machined to the same dimensions, so that the width w of the molded part 103 'is not changed.

8 is a sectional view of a second embodiment of a flange forming roll according to the present invention.

The flanging roll 200 of the illustrated embodiment divides the conventional flanging roll 100 shown in Figure 5 about the lower end point of the inner end face 106 of the forming portion 103 to form the upper roll 210 ') And a lower roll 210. In the illustrated embodiment, the lower roll 210 'is formed with a groove 212 extending downward from the dividing point and an inner end face 205' located in the upper roll 210 is inserted into the groove 212 And is extended by a length corresponding to the depth of the groove 212 so as to form a protrusion which is formed by the protrusion.

9 is a sectional view of a third embodiment of the flange forming roll according to the present invention.

The flanging roll 300 of the illustrated embodiment divides the conventional flange forming roll 100 shown in Figure 5 about the upper end point of the inner end face 106 of the forming portion 103 to form a boundary surface 311 And the lower end of the lower roll 310. The inner end face 305 'is located at the lower end of the lower roll 310. In the illustrated embodiment, unlike the first and second embodiments, the grooves 112 and 212 are not formed, so that the inner end surface 305 'does not extend as much as the length of the grooves 112 and 212. The other components are the same as the other embodiments.

10 is a cross-sectional view of a fourth embodiment of a flanging roll according to the present invention.

The flanging roll 400 of the illustrated embodiment divides the conventional flanging roll 100 shown in Figure 5 about the lower end point of the inner end face 106 of the forming portion 103 to form the upper roll 410 ') And a lower roll 410. Except that the inner end surface 405 'is formed on the upper roll 410'.

11 is a cross-sectional view of a fifth embodiment of a flanging roll according to the present invention.

The flange forming roll 500 of the illustrated embodiment divides the conventional flange forming roll 100 shown in Figure 5 about the midpoint of the inner end face 106 of the forming portion 103 to form the upper roll 510 ') And a lower roll 510. This embodiment is the same as the third embodiment except that the inner end faces 505 'and 505 are formed on the upper roll 510' and the lower roll 510, respectively.

In all of the illustrated embodiments, a screw groove portion extending through the upper roll to the lower roll is formed, but such a screw groove portion may not be formed. This is because the upper and lower rolls are coupled to the rotary shaft in a key-groove manner in the same manner that the flange forming roll is fixedly coupled to the rotary shaft in a key-and-key-engagement manner. This is because the screw groove portion is for reinforcing the coupling between the key and the key-groove style and for facilitating the engagement of the upper and lower rolls.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments.

Primary preform; 12 Secondary preform: 14 Third preform: 16 Press: 20
Upper press: 22 Lower press: 24 neck press: 26
Neck formation Durability: 30 Cylindrical punch: 40 Ring rolling device: 90
Shaft roll: 91,92 Mandrel: 94 Rotation shaft: 99 Flange forming roll: 100, 200, 300, 400, 500 Mold section: 103, 103 'Groove: 112, 212

Claims (5)

A butt welded flange assembly having a forming portion formed on its side and consisting of an upper end surface and a lower surface extending horizontally to each other with a prescribed width and height and an inner end surface extending perpendicularly to the upper surface and the lower surface, In the flange forming roll of the annular rolling apparatus,
The flange forming roll is constituted by an upper roll and a lower roll which are horizontally divided up and down about one point on the inner end surface of the forming portion, and the upper and lower surfaces of the forming portion of the forming roll and the interface between the upper and lower rolls Wherein the width and height of the forming portion of the forming roll are not changed even if the cutting is performed. 2. The apparatus according to claim 1, wherein the flange forming roll is divided into upper and lower parts around an upper end point of the inner end surface of the forming part, wherein a groove extending upward from the dividing point is formed in the upper roll, Is extended upward by a length corresponding to the depth of the groove so as to form a projection inserted into the groove. 2. The apparatus according to claim 1, wherein the flange forming roll is divided into upper and lower portions about the lower end point of the inner end surface of the forming portion, wherein a groove extending downward from the dividing point is formed in the lower roll, Is extended downward by a length corresponding to the depth of the groove so as to form a protrusion inserted into the groove. The flange forming roll according to claim 1, wherein the flange forming roll is coupled to the rotating shaft in a key-and-key groove manner. The flanging roll according to any one of claims 1 to 4, characterized in that the upper roll and the lower roll are coupled by screws.

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