JPS60130404A - Multibar rolling method of steel bar - Google Patents

Abstract

PURPOSE:To roll simultaneously 2-7 pieces of steel bars at a conventional speed by means of multibar rolling, by slitting a preformed rolling material by slitting rolls having specific calibers and forming the slitted materials into products by succeeding calibered rolls. CONSTITUTION:A billet A is rolled into a cross section B in rough and intermediate rollings, and a cross section C, divided, for instance, into four parts by providing three notches to it, is formed by subjecting successively the rolled billet A to rolling reduction to the height h2; the cross section C is provided with deeper notches after being compressed to the width W3, and is rolled into a cross section F prepared for slitting. A caliber of No.6-1 slit roll has a flange P at its central part and oval recesses each of which is formed into a bag caliber with another oval one. Each caliber surrounded by upper and lower slitting rolls has a slant angle beta and forms a biting blade having slant angle alpha jointly with the adjoining caliber. The prepared material having the cross section F is bitten by No.6-1 rolls, and is divided and slitted into four pieces of oval materials g1-1-g3-2, which are raised by twisting them right-handed or left-handed to enlarge the distance between them; four pieces of products k1-k4 are thus obtained at the same time by the rolls No.7-1 and subsequent rolls.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for rolling multiple strips of long steel, and more specifically to a method for simultaneously rolling multiple strips of bar steel, shape-〇.

Recently, in the rolling of steel, non-twist rolling, which uses vertical rolls along with a large increase in rolling speed, has become popular in order to improve physiological properties and quality. For thin products (10 to 16 mm), a two-split blade type using a rotating knife blade installed in a guide device at the point where the roll (2) before the oval near the finishing roll exits can also be used with slit rolling. It has been adopted as the name.

For example, JP-A-51-119583 or JP-A-52
In Japanese Patent No. 116762, a so-called slit rolling method is proposed.

The present invention has been completed by analyzing and examining the conventional slit rolling method, and the purpose of the present invention is to slit rolled material over a wide range of 2 to 7 lines using a special roll with knife performance. The present invention provides Eikoh's ψei rolling method, which makes it possible to increase productivity at the existing roll speed by selecting an appropriate slit size depending on the product size.

The present invention will be explained in detail below with reference to the drawings.

In the manufacturing method of the present invention, a billet having a substantially square cross section A shown in FIG. Create a flat cross section B. Next, in step 2, cross-section B is rolled down to height h2, and three cuts are made to create four-part starting cross-section C. Width of C□2 Width of 04, Width of C2=Width of Ca, Width of C1/C4>Width of C2/C3.

Next, turn the C section up 90 degrees and boil it. Width of C'
W2 is compressed to W-, which causes the cylinder length h of cross section D to be
3 is slightly larger and separated by 4
dI, δ2, δ3, δ4 with three roundness are equal to y. The roll of No. 4 is a blind hole type with flanges. 3
The inclination angle of the two notches is θ-95°, and the angle is θ1-95° from the center.
Distribute to θ2-47°50'. Increase the height, reduce the height, and make a deeper cut.

The thickness of the joint part shall be 4 mm.

A30F is a prepared cross section for slitting at 60 ml. The inside of Oni and W-ban is...! −″Equal. Cutting angle δ
and ω is 90°. The center ω is divided into = ω2-45°. The cuts on both sides are divided into δ1-40° and δ2=50°. The thickness of the joint portion is 27111n.

The ovals fI, f2, f3, and f4 constituting F are blind hole-shaped with equal areas and have flanges.

That is, according to this embodiment, incisions are made from the four grooves before the slit roll, the cross-sectional dimensions of each groove to be divided are equal to g, and the thickness of the connecting part of the cuts is 2. I will be your friend.

The flat plate 6-1 is a slitting roll. In this example, it is divided into four parts, and the center part of the hole shape becomes the flange P.

Each oval has a blind hole shape. Two oval gs on each side of the flange with an inclination of 20° to the center line.
1-1, □-2 and gs-1, 3-2 are arranged oppositely as shown in the drawing. This is to prevent roll thrust from occurring during rolling and to protect the cutter portion of the roll.

In the case of an even number of divisions, the oval hole type arrangement surrounded by upper and lower slit rolls according to the present invention has a flange P in the center.
Then, the same number of hole molds 1-1, 1-2 are arranged symmetrically inside. (Figure 2 G-4, G-6) In the case of odd number division,
One oval hole mold 2 is placed in the center, and one to three oval holes are placed symmetrically on both sides of the oval hole mold 2. (Figure 2 G1-3, G-
5, G-7) The oval hole mold 2 is horizontal and not inclined.

In addition, in the present invention, when dividing into two rolls, the groove surrounded by the upper and lower slit rolls has an oblique angle α around 1 with the adjacent groove, and in the event that the edge of the pallet has an oblique angle β It is given. (Fig. 2 G-2) Regardless of the division description, the appropriate inclination angle β of each oval with respect to the center line is 15°±5°. Further, it is preferable that the meshing angle α of the blades of the upper and lower rolls is 10', the meshing depth S is 3 degrees, and the blade clearance is 03 to 0.5 mm.

In order to perform the above-mentioned slitting process smoothly, the inclination angle θ of the valley of the slit 8 is set to 95° in the groove two holes before the slitting roll, and the slope of the valley of the slit 8 in the groove immediately before the slit roll is adjusted to angle δ
is set at 90°, but it is not fixed to one person.

The rolled material that has passed the butt 5 is separated in the middle in the guide trough that is placed between A6-1, and the cross section F is divided into fI, f2 and f.
It is separated into two parts, 3 and f4, and f and f2 are fitted into gl and g2, and f3 and f4 are fitted into gs and g4, respectively, and the meshing blade part of the roll with a 10' inclination makes the four pieces completely. divided into The depth of this meshing portion has the shape shown in G to S 4 in FIG. 2, and its dimensions are 3 rnrn.

The blade clearance is 0.3 to 0.5 mm. If it is divided into odd numbers, G8, G5, G7 in Figure 2.
It becomes a hole-shaped arrangement, and the preparation material that comes out of boiling 5 is left as it is - flat 6-
1 and divided by upper and lower rolls with similarly shaped blades.

The width of the oval of 6-6-1O to g3 is f of 5.

~There is almost no difference in width from f4, but the thickness is ha<ha
It is said that & In 6-1, each oval cross section is slit and at the same time, the central part is strongly compressed, but the ends are combed.

According to the test, it is desirable to perform slitting during rolling with a rolling reduction of 10-20%, but in consideration of the load on the cutting edge, the rolling reduction for large items should be small and the reduction rate for small items should be large. It's good to do that.

That is, according to the present invention, by elongating the central portion, the thin Yi is pulled and the load on the blade portion is reduced. This protects the blade, cleans the cut b slag, and prevents large burrs from forming at the cutting edge.

As described above, in the present invention, the hole shapes of the upper and lower slitting rolls are out of phase with each other, creating a state in which the material is stretched diagonally, and the meshing force is created by the passing of the upper and lower rolls. Until now, the action and effect of such a slit roll had not been recognized at all.Also, in this slitting process, the oval width and thickness of the slit roll can be adjusted for a single part of the product, regardless of the size. , 2.15x0.76xO, 785 times, and the ratio is kept constant, so the load on the blade edge of the roll hardly changes.

The oval material of g+-□ to g3-2 of the fourth power slit by Haruka 6-1 is raised by 70 degrees to the stone twist and left twist, respectively, and the interval is also removed, and the hl to ha of A'/-1 is It is guided to the hole shape and the oval shape is adjusted. Separation and isolation using the exit guidance device is considered to be up to seven divisions.

A: The four h1 to h4 that passed 7-1 are i in 8-1.
, ~14, deformed as j, ~j4 in the plane 9-1, Al0-
Get 1 to 4 for 4 products at the same time with 1 electric roll.

Although the figure shows the irregular shape = m, the same applies to round steel.

Although the multi-end rolling method for steel bars has been mainly explained above, the multi-strip rolling method for shaped steel, particularly L-shaped steel and angle-shaped steel, will now be explained in detail.

Figure 3 shows, as an example, the case of two-strip rolling of angle iron.

The process from A1 to A5 before the slit roll A6-2 in FIG. 3 is the same as that shown in FIG. 1. A is also slit at -2 g-1g6 is ya7-
2, the cross-sectional shape h'+ necessary for shaping the angle iron
, h'a and N are given.

The two strips of rolled material N, h'2 that have passed through the holder 7-2 are twisted 90 degrees and guided to the boiler 8-2, where they are 11% 1 in A3-2.
2, m+ at A 9-2, n+sn at A2, A 102
2. Or in A11, p in final roll A12 in 02% history
+, p2 is notated ξ to obtain 2 Sakae angle iron. A6-2
There is no particular restriction on the number of passes before and after the slit.

In the present invention, the plurality of grooves surrounded by the upper and lower slit rolls have an inclination angle β, and the inclination angles are arranged so as to be inclined in the same direction. Can be processed.

The oval hole type arrangement surrounded by upper and lower slit rolls according to the present inventor's application is arranged with the same inclination for both odd and even number divisions. Figure 4 shows the case of two slits,
FIG. 5 shows an arrangement in the case of four slits. In either case, the inclination angle β of the oval with respect to the center line is suitably about 20°. Also, the engagement angle α of the blades of the upper and lower rolls is 10°, the engagement depth S is 3111 m, and the blade clearance is 0.3.
~0.5111111 is redundant. X in the diagram,
y indicates the slope of the flange.

In order to perform the above-mentioned slitting process smoothly, the inclination angle θ of the valley of the slit portion of the hole mold two before the slitting roll is set to 956, and the slope angle δ of the valley of the slit portion of the hole mold immediately before the slit roll is set to 956.
is assumed to be 90°, but this is not particularly limited.

In addition, by arranging each spur at an angle of 20 degrees with respect to the center line in the above-mentioned slit, the split material that leaves the roll via the fund is tilted at 90 degrees with respect to the roll axis. The twist of the kongata itself helps, and also makes the division into the kurei kata smoother.

As detailed above, according to the present invention, it is possible to select an appropriate number of slits based on the product size, and roll brass steel in multiple strips at the current roll speed, and its engineering effects are unparalleled. be.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the flow of the present invention, Fig. 2 is a schematic diagram of an embodiment of the slit roll of the present invention, Fig. 3 is a schematic diagram of an example of the angle iron of the present invention, and Fig. 4 is a schematic diagram of an embodiment of the present invention. FIG. 5 is a schematic diagram of another example of the slit roll of the present invention. A: Billet W: Billet width h: Billet height ω, δ: Cutting angle f Niopal hole type P: Flange

Claims (1)

[Claims] 1. Preformed rolled rough material is introduced into slit rolls corresponding to the number of long steel products to be simultaneously obtained by hot rolling, and is surrounded by the upper and lower slit rolls. The hole type is
The blade has an inclination angle β, and also engages the adjacent groove and the inclination angle α to form a blade, and performs slitting while rolling the rolled rough material, and further scales and scales the products respectively with subsequent groove rolls. Characteristic multi-strip rolling method for long steel. 2. A horizontal oval hole mold surrounded by upper and lower slit rolls is provided in the center, and the same number of oval hole molds are arranged symmetrically on both sides, and the inclination angle β of the oval hole mold is set to 15° ± 5°, 2. The multi-strip rolling method for long steel according to claim 1, characterized in that slitting is performed during rolling ffi at a reduction rate of at least 10%. 3 Arrange open oval holes symmetrically on both sides, (
1) A method for rolling multiple strips of long steel according to claim 1, using a slit roll having a flange at the center. 4. A plurality of holes surrounded by the upper and lower slit rolls have an inclination angle β, and are arranged with the inclination angles inclined in the same direction, and slit processing is performed during rolling using interlocking blades that also engage the inclination angle α. 1. A method for rolling unshaven multi-strips according to claim 1, characterized in that: 5. The double oval hole type is the multi-〇ψ strip rolling according to claim 4, in which the inclination angle β is regulated to 20°, and the slits are formed during rolling at a reduction rate of at least 10%. Method.