JPH02290602A - Rolling method for angle material - Google Patents

Abstract

PURPOSE:To raise the flat parts at the end faces in the edge parts of an angle material by rolling the edge parts by using 3-way rolls and the side parts by using double rolls in the finishing stage for the angle material. CONSTITUTION:The angle material W subjected to a roughing stage is disposed to a peak shape and is passed through the 1st finishing device 4 in the edging stage. The edge parts W 3 of the angle material W are then edged by edge molding calibers 421 of edging rolls 42 while the intersected part W 6 of the one side part W1 of the angle material W and the other side part W2 thereof are held supported by V-grooves 400 of central rolling rolls 40. The edged angle material W is passed through the 2nd finishing device 5 in the thickness adjusting stage. The one side part W1 of the angle material W and the other side part W2 thereof are then rolled down at a high draft in the thickness direction by a V-caliber 50 of a grooved rolling roll 51 of the device 5 and a V-caliber projecting part 53 of a projecting rolling roll 54 thereof, by which bulging parts W5 are rolled and the thickness is adjusted to a prescribed size. The end faces W4 which are slightly recessed are flattened square.

Description

[Detailed description of the invention] [Industrial application fields] The present invention relates to a method of rolling an angle material.

[Prior Art] Conventionally, there are two main methods known for manufacturing angle materials. The first method is a forming method in which the central part of the cross section of a long thin flat plate is bent with rolls to produce an angle material.

The second method is to manufacture the angle material from a thick billet using rolling rolls. In this second method, the rolling apparatus is a horizontal double type rolling apparatus having a set of upper and lower holes in which the first to eighth grooves 10 to 18 are continuously arranged as shown in FIGS. 6(A) to 6(I). Rolled using rolls.

The double roll rolling device 104 shown in FIG. 10 has an eighth hole type 18 which is a finishing hole type shown in FIG.

In this eighth hole mold 18, the outer circumferential surface 101a of the full rolling roll 101 and the outer circumferential surface 103a of the protruding rolling roll 103 are
A space P is formed between the two holes, and therefore the eighth hole mold 18, which is a finishing hole type, is a horizontal horizontal construction.

In the second conventional method, first, in the rough rolling process,
Using a billet 10 having a constant cross-sectional shape as shown in FIG.
The billet 10 is rolled in order in the first to seventh grooves 10 to 17 shown in FIG.
8, it is rolled into an angle material.

Next, the V hole 10 of the rolling roll 101 is passed through a double roll rolling machine 104 as a finishing rolling machine shown in FIG.
One side W1 and the other side W2 of the angle material W are held between the V-hole protrusion 102 of the butt rolling roll 103 and finish rolling is performed.

The angle material W manufactured by rolling as described above is the first
As shown in Figure 2, one side W1 intersects with each other in the cross section.
and the other side W2, but because it is rolled in an open-hole die, the end surface W4 of the edge W3 is not flat but rounded when viewed in cross section. The angle material W is strongly compressed in the thickness direction by the grooved rolling roll 101 and the protruded rolling roll 103, and the angle material W is
It comes out because the flesh of the end surface W4 bulges out.

If the end surface W4 of the edge portion W3 is rounded as described above, the buttability will not be good when the angle members W are joined in a butt state by welding or the like as shown in FIG. 13. If the buttability is not good as described above, it is not preferable for welding work in recent years, where an increase in welding strength is particularly required.

In addition, in recent years, there has been a particular demand for decorativeness in the field of architecture.
The angle material W in which the end surface W4 of the edge portion W3 is rounded is not suitable for use as an exterior material that requires decorative properties. Edge portion W3 of portion W2 is intentionally cut to form a right-angled end surface. Therefore, it is disadvantageous in terms of yield and secondary processing cost.

[Problems to be Solved by the Invention] The present invention has been made in view of the above-mentioned circumstances, and its purpose is to provide a method of rolling an angle material that improves the problem of roundness of the end face of the edge portion.

[A Thousand Steps to Solve the Problem] By the way, in order to achieve the above object, as shown in FIG. It is also possible to use a closed hole type double roll rolling method in which the space P is not substantially formed, but if this closed hole type is adopted as the final finishing hole type, the top corner of the angle material W Due to the difference in roll peripheral speed between the roll peripheral speed VA and the roll peripheral speed VB of the edge portion (VA<VB>), seizing, flapping, etc. occur on the edge portion surface of the angle material W, and the surface quality of the angle material W deteriorates. Furthermore, as shown in FIG. 13, when the grooved rolling roll 101 and the protruding rolling roll 103 are of a closed-hole finishing type rolling system, only the angle material W having one type of thickness can be rolled.

As a result of intensive research on the method of rolling angle materials, the present inventor intensively edge-rolled the edge portion of the angle material W using three-way rolls in the finish rolling process, and then
We conceived of a method of rolling one side and the other side of the angle material W in the thickness direction using heavy rolls. The present invention has been completed based on this idea.

That is, the method for rolling an angle material of the present invention includes at least one central rolling roll that contacts the surfaces of one side and the other side of the angle material, which is composed of one side and the other side that intersect with each other in the cross section. , a first finishing rolling device equipped with two edge rolling rolls having edge forming holes with a predetermined cross-sectional shape extending in the circumferential direction and arranged in a direction in which their axes intersect; A rolling roll with a groove having a V-hole shape, and a V-shaped groove extending in the circumferential direction and corresponding to the V-hole shape.
A metal billet with a constant cross-sectional shape is processed by a rough rolling device using a second finishing rolling device consisting of a protruded rolling roll having a grooved protrusion and an axis parallel to the axis of the grooved rolling roll. A rough rolling step is performed to obtain an angle material by rolling, and the angle material that has undergone the rough rolling step is passed through a first finishing rolling device, and while one side and the other side of the angle material are supported by a central rolling roll, the angle material is rolled. An edge rolling step in which each edge of one side and the other side is edge-rolled using an edge forming hole mold of an edge rolling roll, and the edge-rolled angle material is passed through a second finishing rolling device, One side and the other side of the angle material are held between the hole shape of the grooved rolling roll and the hole shape protrusion of the protruded rolling roll, and the thickness of one side of the angle material and the thickness of the other side are adjusted. This method is characterized in that the thickness adjustment steps are sequentially performed.

In the present invention, the rough rolling step can be performed, for example, by hot rolling. The finish rolling process can be performed, for example, by cold rolling or warm rolling.

In the present invention, a billet means a long metal body that can be plastically deformed and has a predetermined cross-sectional shape. In this case, the cross section may be square or round.

The material of the billet can be, for example, steel, stainless steel, or titanium alloy.

In the present invention, the first finishing rolling device and the second finishing rolling device may be arranged independently, or may be integrated into one piece of equipment.

[Example] An example of the present invention will be described with reference to FIGS. 1 to 6.

First, for convenience of explanation, the apparatus used in the method according to this embodiment will be explained. FIGS. 6(A) to 6(I) show the grooves to be attached to the rough rolling device. That is, FIG. 6(A)~
A first caliber 11 that performs rough rolling as shown in (1);
2nd caliber 12, 3rd caliber 13, 4th caliber 1
4, a fifth caliber 15, a sixth caliber 16, a seventh caliber 17, and an eighth caliber 18 are formed.

Further, as shown in FIG. 1, the first finish rolling apparatus 4 is of a three-way roll type and is formed of one central rolling roll 40 and two edge rolling rolls 42. The central rolling roll 40 has a V-groove 40 having a circular cross section that continues in the circumferential direction.
0, and is arranged so that its axis 401 faces in the horizontal direction.

The edge rolling rolls 42 are arranged such that their axes 420 are inclined at about 45 degrees and intersect with each other.

The edge rolling roll 42 is formed with an edge forming hole mold 421 having a predetermined cross-sectional shape and making one revolution in the circumferential direction. As shown in FIG. 5, each edge forming hole mold 421 is formed of a ring bottom 422 that bulges out with an arc, and ring side surfaces 423 that face each other. In addition, the central rolling roll 4
0 is connected to the drive motor and is called the drive type.
Each edge rolling roll 42 is of a driven type.

As shown in FIG. 2, the second finishing rolling device 5 includes a grooved rolling roll 51 having a hole 50 with a cross section extending in the circumferential direction and a cross section corresponding to the V hole 50 extending in the circumferential direction. It is formed from a protruded rolling roll 54 having a V-shaped protrusion 53. The protruded roll roll 54 has an axis 540 that is parallel to the heel core 510 of the grooved roll roll 51 . The groove rolling roll 51 and the protruding rolling roll 54 are each connected to a drive motor, and are of the drive type.

Next, the rolling method according to this example will be explained. First, stainless steel (SUS304) has a constant cross-sectional shape.
A billet 10 (square cross section, width 82 mm, height 82 mm, length 2 m) made of A.

In the rough rolling process, the heated billet 10 is hot rolled in order by the first caliber 11, the second caliber 12, the third caliber 13, and the fourth caliber 14 of the rough rolling device. The angle material W is obtained by sequentially hot rolling with the sixth caliber 16, the seventh caliber 17, and the eighth caliber 18 and gradually deforming it into an L-shaped cross section. In the edge rolling process, the angle material W that has undergone the rough rolling process is arranged in a mountain shape and passed through the first finish rolling apparatus 4 shown in FIG. 1 in a cold state, a warm state, or a hot state. Then,
As shown in FIG. 1, the intersection W6 of the one side W1 and the side part W2 of the angle material W is supported by the V groove 400 of the central rolling roll 40, while the one side W1 and the other side W2 of the angle material W are supported by the V groove 400 of the central rolling roll 40. Each edge portion W3 of the edge rolling roll 4
Edge rolling is performed using the second edge forming hole die 421. At this time, as shown in FIG. 4, a swollen portion W5 is generated on both sides of the edge portion W3 of one side W1 and the other side W2 of the angle material W due to edge rolling. The end surface W4 of the edge portion W3 is slightly concave. This is because, as shown in FIG. 5, the ring bottom surface 422 of the edge forming hole mold 421 is bulging.

Next, a thickness adjustment process is performed. In the thickness adjustment process, the edge-rolled angle material W is transferred to the second finishing rolling device 5 shown in FIG.
pass through. Then, as shown in FIG. 2, one side of the angle material W is formed by the V-shaped protrusion 50 of the grooved rolling roll 51 of the second finishing rolling device 5 and the V-shaped protrusion 53 of the protruding rolling roll 54. The portion W1 and the other side portion W2 are strongly compressed in the thickness direction, thereby rolling the swollen portion W5 and forming the angle shank W.
The thickness of one side W1 and the other side W2 are adjusted to predetermined dimensions, and the thickness of the edge W4 of the edge W3 bulges outward, so the edge W4, which had been slightly concave, becomes flat. Therefore, the end surface W4 is in a right-angled state.

By the way, as shown in FIG. 2, when rolling the angle material W with the V-hole type 50 of the grooved rolling roll 51 and the V-hole type protrusion 53 of the butt rolling roll 54, the angle material W and the V-hole type are rolled. The contact area with the mold 50 and the contact area between the angle material W and the hole-shaped protrusion 53 are large, but in this embodiment, the grooved rolling roll 51 and the protruding rolling roll 54 Since both are of the drive type as described above, a predetermined rolling load can be ensured, and therefore the thickness of the angle material W can be ensured satisfactorily.

In this example, after the thickness adjustment process is completed, a heat treatment process, a straightening process, and a pickling process are sequentially performed.

In the heat treatment process, the angle material W that has undergone the thickness adjustment step is placed on a conveyor roller and run through a heat treatment furnace to heat the angle material W to 1150°C. Cooling water is sprayed onto the angle material W leaving the heat treatment furnace. Perform blunt processing. The straightening process is performed by placing the angle material W@on a conveyance roller and passing it through the straightening roller. The pickling process is performed by spraying acid onto the angle material W placed on the conveyance roller and washing it with vinegar, and then spraying water onto the angle material W placed on the conveyance roller and washing it with water.

According to the rolling method of this embodiment, it is possible to obtain an angle material W in which the end surface W4 of the edge portion W3 is flat and in a right-angled state.

Furthermore, according to the rolling method of this embodiment, in the final rolling in the finishing rolling, an open double roll system consisting of a grooved roll 51 and a protruded roll 54 is used in the thickness adjustment process, so that closed hole rolls are used. Unlike the case of a mold, the rolling speeds of the front and back sides of the angle material W can be easily approximated, which is advantageous for ensuring a good surface of the angle material W.

8 and 9 show a cross section of an edge portion W3 of an angle material W manufactured by a rolling method according to another embodiment of the present invention. In the example shown in FIG. 8, a groove portion W8 for weld build-up is formed on one side of the edge portion W3. In the example shown in FIG. 9, groove portions W8 are formed on both sides of the edge portion W3. In order to form the groove portion W8 in this manner, the cross-sectional shape of the edge forming hole mold 421 of the edge rolling roll 42 is adjusted. Also in the examples shown in FIGS. 8 and 9, the end surface W4 of the edge portion W3 is flat.

[Effects of the Invention] According to the rolling method of the present invention, it is possible to obtain an angle material in which the end face of the edge portion is in a flat state.

[Brief explanation of drawings]

Fig. 1 is a front view schematically showing the first finishing rolling equipment;
The figure is a front view schematically showing the second finishing rolling device, and FIG. 3 is a cross-sectional view of the angle material manufactured by the rolling method of this example.
Fig. 4 is an enlarged sectional view schematically showing the edge portion when edge rolling is performed, Fig. 5 is an enlarged sectional view schematically showing the edge forming hole type, and Fig. 6 (A) (B) (C). (D) (E) (F
)(G)(+-1)(I) is a cross-sectional view of a portion of the caliber of the rough rolling roll, and FIG. 7 is an enlarged cross-sectional view of the edge portion of the angle material manufactured by the rolling method of this example. FIGS. 8 and 9 are enlarged cross-sectional views of the edge portion of an angle material manufactured by the rolling method of another example. FIG. 10 is a front view schematically showing a conventional finishing rolling device;
Fig. 11 is a cross-sectional view of an angle material manufactured by the conventional rolling method, Fig. 12 is a cross-sectional view of the angle material manufactured by the conventional rolling method in a butted state, and Fig. 13 is a closed-hole double layer It is a sectional view of a rolling roll. In the figure, 4 is the first finishing rolling device, 40 is a medium rolling roll, 4
2 is an edge rolling roll, 421 is an edge forming hole type, 5 is a second finishing rolling device, 51 is a grooved rolling roll, and 54 is a protruding rolling roll.

Claims (1)

[Claims] (1) At least one central rolling roll that contacts the surfaces of one side and the other side of an angle member consisting of one side and the other side that intersect with each other in the cross section, and a central rolling roll with a predetermined cross section extending in the circumferential direction. a first finishing rolling device equipped with two edge rolling rolls having edge forming holes and arranged with their axes intersecting; and a grooved rolling roll having a V-shaped hole extending in the circumferential direction and having a V-shaped cross section. and a protruded rolling roll having a V-shaped protrusion extending in the circumferential direction and having a V-shaped cross section corresponding to the V-shaped protrusion, and having an axis parallel to the axis of the grooved rolling roll. A rough rolling step in which a metal billet with a constant cross-sectional shape is rolled in a rough rolling device to obtain an angle material, and an angle material that has undergone the rough rolling step is passed through the first finishing rolling device to form an angle material. an edge rolling step of edge rolling each edge portion of one side and the other side of the angle material with the edge forming hole mold of the edge rolling roll while supporting one side and the other side with the central rolling roll; , passing the edge-rolled angle material through the second finishing rolling device, and rolling the grooved rolling roll of the second finishing rolling device.
A thickness adjustment step of adjusting the thickness of one side and the other side of the angle material by sandwiching one side and the other side of the angle material between the hole shape and the V-shaped protrusion of the protruded rolling roll. 1. A method for rolling an angle material, which is carried out in sequence to improve the flatness of the end face of the edge portion of the angle material.