JPS6096301A - Method and device for reducing width of rectangular material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a method and apparatus for reducing the width of a rectangular material, and particularly to a method for reducing the width of a rectangular material in which the width of the material is reduced uniformly over the entire longitudinal direction of the material. and related to equipment.

[Background of the invention]

Recently, in the steel industry, the width of long plate materials with a rectangular cross section (abbreviated as rectangular materials), especially rectangular materials for hot rolling, which are the raw materials for thin sheets, has been changed to allow for flexible sheet width. Establishing adjustment technology is a major challenge. This is because slabs are now often manufactured by a continuous casting method (hereinafter referred to as a continuous casting method) instead of the conventional blooming method.

In other words, in the continuous casting method, it is difficult to change the width of the slab during operation due to the structure of the casting nozzle.
This is because when considering productivity, it is desirable to always manufacture slabs with a constant width, and therefore it is desirable to change the width of the slab in the next rolling process.

Under these circumstances, for example, Japanese Patent Application Laid-Open No. 55-48401
As shown in this issue, a known method for changing the width of a slab during the rolling process is to use a taper press to edge the front and rear ends of the slab, and then use vertical rollers to change the width of the slab over its entire length. .

By the way, in this method, when etching is performed using a taper press, the radius of the compressed part of the taper press 1 is close to infinity, as shown in Fig. However, in the case of width reduction work using vertical rolling rolls, the diameter of the roll 3 is as small as about 1200 to 2000 mm, as shown in Fig. 2, for example. If the pressing force extends to the central portion of the material 2<<, so-called dog bones 4, where the edge of the plate width becomes locally thick, are likely to occur.

Therefore, in the case of the material 2 having both ends in the longitudinal direction whose width has been flattened and a portion other than both ends where the dog bones 4 are formed, the cross-sectional area is also different from both ends and the other portions. When the thickness is reduced in the width direction by horizontal rolling, for example, as shown in Fig. Width reversion occurs. As a result, material 2 has a shape in which the plate width is narrow at both ends in the longitudinal direction and wide at the center side,
In order to make the width of the product constant, it is necessary to cut out the widening portion, which causes a problem of lower yield. For example, the board width bO of the wide part is 12001! +
1. The board width at the narrow part is about 1170cm, which is about 30mm.
This results in a difference of m.

Note that in order to prevent the formation of dog bones 4, it is calculated that the vertical roll 3 needs to have a diameter of 15 to 20 m, but in reality it is impossible to manufacture such a large roll.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method and apparatus for reducing the width of a rectangular material, which can reduce the width of the material to a uniform board width over the entire longitudinal direction of the material. do.

[Summary of the invention]

In the method for reducing the width of a rectangular material according to the present invention, the width of the tip of the material is reduced using a pair of press tools that have parallel pressure surfaces and move in a direction substantially perpendicular to the running direction of the material, and The width of the part is reduced by a pair of press tools that have pressure surfaces arranged in a tapered manner and whose width gradually narrows in the direction in which the material travels, and which vibrate in a direction substantially perpendicular to the direction in which the material travels. It is characterized by

In addition, in the rectangular material width reduction device according to the present invention, the compressed material is arranged in parallel on both sides of the running line with the pressing surfaces facing each other, and the front portions of the pressing surfaces in the material running direction are parallel to each other. a pair of press tools each having a tapered portion and a rear portion; a pressurizing means and a vibrating means for pressurizing and vibrating each of the press tools in a direction substantially perpendicular to the material running direction;
The present invention is characterized by comprising a control device that detects that the tip of the material is placed in the parallel portion of the press tool, operates the pressure means, and operates the vibration means after applying a predetermined pressure.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 4 to 8.

First, a width reduction device for a rectangular material will be explained.

A pair of press tools 11 are arranged in parallel on both sides of the compression material 12 with their pressing surfaces 13 facing each other.

The pressing surface 13 of each press tool 11 has a parallel section 13 at the front in the material running direction, and a tapered section 13B at the rear. The taper angle θ of this tapered portion 13B is, for example, 1
It is set at 5°.

The press tools 11 are each supported by a cylinder device, for example a hydraulic cylinder 15, via a rod 14. Each cylinder device 15 is connected to the pump 1 via a servo valve 16.
7 and tank 18 are connected. Servo valve 16
A command device 19 is connected to the cylinder device 15 to give operation commands to the press tool 11 via the cylinder device 15. That is, the cylinder device 15 is given a function as a pressurizing means and a vibration means for the press tool 11, and functions as a pressurizing means when the command unit 19 gives an operation command to the servo valve 16 in only one direction. It functions as a vibration means by giving motion commands in forward and reverse directions. Note that 20 is a pinch roller for moving the material, which is supported at both ends by bearings 21 and is driven by a motor 22. This motor 22 is provided with a detector 23 for detecting the number of revolutions, and is used to give a command to start or stop the command unit 19.

Next, the width reduction method will be explained.

Each of the press tools 11 operates synchronously with each other via a servo valve 16. That is, the compression operation indicated by the solid line arrow B in FIG. 5 and the release operation indicated by the dotted line arrow B are performed synchronously. For the slab 12 as a material, the press tool 11 is B
When the direction is released, it is sent in the direction of arrow C and moves forward.

Furthermore, during compression in the A direction, feeding of the slab 12 is stopped.

Advancement amount S of the slab 12 when the press tool 11 is opened
is the width reduction amount of the slab Δb=B−b, the repeated compression cycle of the press tool is N1 amplitude is a1, the taper angle is θ, and S = a / tanθ ・・・・・・・・・・・・・・・
...It can be concluded from (1). Also, the average advancement speed V of the slab is V=SN=aN/laaθ ・・・・・・・・・
・・・・・・・・・・・・(2) In this way, it is possible to reduce the width of the slab by pressing over the entire length of the slab.

When performing the width reduction action, first, the interval between the press tools 11 is increased, and the slab 12 is retracted into the parallel part 13A provided at the bottom of the tape tool, and the advancing movement of the slab is stopped here (the first Figure 6 (4)). Thereafter, the press tool 11 is moved to a specified position in the slab width reduction direction A to perform compression (FIG. 6@). After the initial amount of compression, the press tool 11 is opened in direction B, and then vibrates, that is, press A.

The opening operation B is repeated, and the slab 12 is fed into the press tool 11 according to equations (1) and (2) (FIG. 6, 0).

In detail, the slab 12 is first conveyed into the press tool 11, and its tip is aligned with the parallel part 1 of the press tool 11.
3A, but this stopping is done by the length measurement method using the conveying device, that is, the rotation speed of the roller by the rotation speed detector 23 of the motor 22! The slab position is compressed with a large stroke to the B' position shown by a more indirect measurement method or an optical position detector installed at the press tool position, and then the command value asia2πNt of the command unit 190 is set.
Accordingly, the press tool is repeatedly released and suppressed.

The opening amount of the press tool 11 is, for example, a=100■, and during this opening, the slab 12 is moved by the pinch roller 20 in the direction of arrow C.
sent by. For example, the feed amount S per time is S=37
It is 3m.

(9) In order to suppress and release the press tool 11, the pump 17 sends high pressure oil to each servo valve 16, and the second servo valve 16 supplies the required amount of oil to the cylinder device 15 based on the command from the control command unit 19. , the return oil from the servo valve 16 is returned to the tank 18. The high pressure oil sent to the cylinder device 15 operates the piston of the cylinder device 15,
The press tool 14 repeats the pressing and releasing movements.

By repeating the above operations, width reduction over the entire length of the slab is completed, and the press tool advances and retards to the No. 1 lid shown in FIG. 4 in order to reduce the width of the next slab.

Thereafter, width reduction work is performed using the press tool 11 in the same manner.

The hot material slab 12 to be width-reduced has a thickness of about 230 m, a width of 1500 m, and a length of about 14000 m, and the temperature is 1050 - the pressure required for the press tool when θ = 15°. (10) Tightening force F is approximately 2000m.

If the opening degree a of the press tool 11 is set to 100, the advance amount S of the slab 12 per one cycle of the press tool 11 is 5=373111 according to the above-mentioned equation (1).

Also, if N = 0.5 / FHJ, slab 1
2 average processing speed VFi, (from formula 21, V=186.5
There will be 1 prize.

Further, the time to complete narrowing of a 12,000III+ length slab is about 64 seconds.

According to the above embodiment, over the entire length of the slab width, the first
It was possible to reduce the width of the cross-sectional shape as shown in the figure, and even after the next step of horizontal rolling, as shown in Fig. 6, it became possible to reduce the width without losing width at the leading and trailing ends.

Also, unlike the case of pressing directly using a tapered surface, so-called "corners" or dents are formed at the tip of the slab. That is, as shown in FIG. 7, the slab 12 is conveyed to the press tools 11 that are waiting in close proximity to each other, and from this state, the press tools 11 are pushed in the input direction.
Compress the width of the slab, then open the press tool 11 in the B direction (11), release it, advance the slab by the amount of opening, compress it again, and repeat this operation to reduce the υ plate width B. It is also possible to reduce the width to b.

However, such a compression method using a press has the following drawbacks.

(1) First, when sending the slab 12 to the waiting press tool 11, the edge of the slab 12 hits the press tool 11,
24 (Fig. 7).

(3) In order to remove the recess 25, the taper angle θ of the press tool must be reduced to 7.5 degrees or less;
When the angle θ is made small in this way, the compressive force in the A direction of the press tool 11 becomes extremely strong for the following reason.

That is, the taper portion 13B of the press tool 11 is cut, but if θ is small, l becomes a dog. If the deformation resistance of the material is reduced, the compression load increases in proportion to km·(12) t, which is disadvantageous because the apparatus for performing compression becomes enormous.

On the other hand, at the start of press compression, the tip of the slab is positioned within the parallel part of the press, press compression is performed, and then
According to the above-mentioned embodiment, in which width reduction is performed over the entire press length by the vibration movement of a predetermined press tool, uniform width reduction is possible without producing corners 1 and dents that occur at the tip of the slab.

Furthermore, in the method shown in FIG. 7, due to the problem of the magnitude of the friction coefficient between the slab 12 and the press tool 11,
Although it is said that the press tool 2 often slips and the compression of the tip part fails, as in the above embodiment, the parallel part 1 of the press tool 11
By starting compression at 3A, there were no slip problems.

In the above embodiment, the vibration of the press tool 11 was given by a sinusoidal wave as shown in FIG. be done.

(13) If a press tool suppression power source similar to the vibration of the press tool is used for lowering with a small stroke amplitude a, then according to equation (2) above, the width reduction transfer speed V of the slab 12 is proportional to JIN(C. Therefore, , when increasing the amplitude a, the repetition cycle N of the tool may be decreased.

That is, the amplitude a1 cycle N can be appropriately selected so that aN is constant.

Furthermore, although the above embodiments have been explained using hot slab materials as an example, it is of course applicable to cold work or plate materials that are thinner than slabs.

Furthermore, in the above embodiment, the rolling mechanism is a cylinder device, but it is obvious that the object of the present invention can be achieved by using other suppressing mechanisms such as an electric crank.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to reduce the width of a rectangular material uniformly over the entire longitudinal direction, and it is possible to achieve excellent effects such as preventing the occurrence of abnormal (14) shapes and improving the yield. be done.

[Brief explanation of the drawing]

Figures 1 to 3 show conventional examples; Figure 1 is a cross-sectional view of the processed part by a taper press, Figure 2 is a cross-sectional view of the processed part by roller compression, and Figure 3 is a plan view showing a rolled product. , Fig. 5 to Fig. 8 show one embodiment of the present invention, Fig. 4 is a schematic diagram showing the overall configuration, Fig. 5 is an enlarged view showing the press tool, and Fig. 6 is an explanation showing the operation. FIG. 7 is an explanatory diagram showing a comparative example for reference, FIG. 8 is a schematic diagram showing signals from a command device, and FIG. 9 is a schematic diagram showing another embodiment of the present invention. 11...Press tool, 12...Material (slab), 1
3... Pressure surface, 13A... Parallel part, 13B... Taper part, 15... Pressure means (vibration means) (cylinder device), 16.17, 18.19... Control device. Agent Patent attorney Tatsuyuki Unuma (15) Mo 6th Fig. 1 (A) CB) Mo 8 Fig. 1 (C) House qv

Claims (1)

[Claims] 1. A rectangular material whose width is reduced over the entire longitudinal direction by applying a compressive force from the width direction while feeding a long plate-like material having a rectangular cross section in the longitudinal direction. In the width reduction method, the tip part of the material is reduced in width by a pair of press tools that have parallel pressure surfaces and move in a direction substantially perpendicular to the running direction of the material, and the parts other than the tip part are reduced in width.
It is characterized by having pressurizing surfaces arranged in a tapered shape where the width gradually narrows in the direction in which the material travels, and in which the width is reduced by a pair of press tools that vibrate in a direction substantially perpendicular to the direction in which the material travels. A method for reducing the width of a rectangular material. 2. The method of reducing the width of a rectangular material according to claim 1, wherein the compressive force is applied to the leading end portion of the material and the other portions at approximately the same position. 3. The pressurizing surfaces for compressing the material are arranged opposite to each other on both sides in the width direction of the running line of the compressing material, and the front part of the pressurizing surface in the material feeding direction is a parallel part, and the rear part is a tapered part. a pair of press tools, a pressurizing means and a vibrating means for pressurizing and vibrating each press tool in a direction substantially perpendicular to the material feeding direction, and detecting that the tip of the material is placed in the parallel part of the press tool. A width reduction device for a rectangular material, comprising: a control device that operates the pressure means and operates the vibration means after applying a predetermined pressure.