JP2001232452A - Pinch roll of continuous casting machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably achieve drawing and to prevent surface flaws by inclining grooves on a roll surface to the axis of a roll, setting the grooves to be symmetric with respect to the center of the roll body length and specifying the spacing of the grooves. SOLUTION: A pinch roll of a continuous casting machine has grooves 20 on the roll surface 1 which are symmetric in the right-to-left direction with respect to the center of the roll body length B and form an angle α of inclination with respect to the roll axis A to perform reliable drawing and centering of a slab 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pinch roll of a continuous casting machine, and more particularly, to a roll surface having a groove which is symmetrical with respect to the center of the roll body length and has an inclination angle α with respect to the roll axis. Accordingly, the present invention relates to a novel improvement for ensuring the removal of a slab and obtaining the effect of self-centering.

[0002]

2. Description of the Related Art Conventionally, there are various types of pinch rolls of a continuous casting machine of this kind which have been used. Among them, representative ones are disclosed in JP-A-52-14529 and JP-A-4-71762. FIGS. 4 and 5 show configurations disclosed in the gazette. That is, in the case of the pinch roll of FIG. 4, a mesh-like rough surface 3 is formed on the roll surface 1, and the slab 2 is pulled out by friction of the rough surface 3.
In the case of the pinch roll shown in FIG. 5, a circumferential slit 4 is formed on the roll surface 1 and the slab 2 is pulled out by friction of the slit 4.

[0003]

The pinch roll of the conventional continuous casting machine has the following problems because it is configured as described above. That is, in the case of the pinch roll disclosed in FIGS. 4 and 5 described above, the purpose is to prevent the propagation of cracks in the roll or to cope with heat removal.
In the case of a continuous casting machine without a drawing stand, conventionally, if the casting stop time becomes longer due to a width change timing or a tundish change timing, etc., an increase in the deflection of the roll due to the uneven heat of the roll growing at the time, and The drawing resistance caused by the increase in the bulging amount increases, and there is a problem that the drawing cannot be performed when the casting is restarted. Further, in the case of a continuous casting machine in which a drawing stand is installed, conventionally, the pinch roll of the drawing stand has a large pressing force and rolls the slab slightly, so that various factors (due to defects in adjusting the gap between the upper and lower rolls, The meandering of the slab due to the deviation of the reduction ratio in the width direction, the meandering of the slab due to the deviation of the reduction ratio in the width direction due to the deviation of heat in the width direction of the slab, the casting due to the play between the pinch roll bearing box and the housing. There was a problem of bending of the cast slab due to meandering of the slab).

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and in particular, a groove on a roll surface which is symmetrical with respect to the center of the roll body length and has an inclination angle α with respect to the roll axis. It is an object of the present invention to provide a pinch roll of a continuous casting machine that ensures the removal of a cast slab and also obtains a self-centering function.

[0005]

According to the present invention, there is provided a pinch roll for a continuous casting machine, comprising: a pinch roll for a continuous casting machine having a roll surface which comes into contact with the slab for drawing the slab cast by the continuous casting machine. The roll surface is symmetrical with respect to the center of the roll body length B, and the roll axis A
And a radius R of the arc portion in the cross section of the groove is at least 5 mm.
The minimum value of the groove interval between the grooves is twice the radius R, and the maximum value is A.
= 0.5 × B _S × tan α (where B _S is the minimum slab width of the drawn slab (2)).

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a pinch roll of a continuous casting machine according to the present invention will be described below with reference to the drawings. The same or equivalent parts as those in the conventional example will be described with the same reference numerals. In FIG. 1, what is indicated by reference numeral 2 is a strip-shaped cast piece hanging down through a tundish 10 and a mold 11, and the cast piece 2 is formed by bending a large number of segment rolls 12 and pinch rolls 13. The tip is pulled out by the pinch roll 13 incorporated in the pull-out stand 15 while being pulled out.

As shown in FIG. 2, the pinch roll 13 has a groove on its roll surface 1 which has an inclination angle α not parallel to the roll axis A and which is symmetrical with respect to the center of the roll body length B. 20 are formed.

As shown in an enlarged scale in FIG. 3, when the groove 20 is shown in a sectional view, the grooves 20 are arc portions R ₁ , R ₂ , R _2.
Are formed, and each of the arc portions R ₁ , R ₂ , R ₂ has a radius R
Is set to 5 mm or more. The minimum value of the groove spacing D is a distance between each of the grooves 20 is twice the radius R, the maximum value _{A, A = 0.5 × B S ×} tanα ( where, B _S is of the slab 2 (Smallest slab width). When the radius R is 5 mm or less, surface flaws are easily formed,
If the groove interval D is outside the above-mentioned range, the engagement with the slab 2 is insufficient.

The friction coefficient μ is increased by the groove 20 formed in the roll surface 1, and the product (pulling ability) of the pinch roll pressing force and the friction coefficient μ becomes larger than the pulling resistance force. Can be eliminated.
Also, the presence of the groove 20 causes the groove 2 to extend over the entire length of the slab 2 surface.
It is considered that a stamp flaw of 0 is generated, which may cause surface flaws in the lower process. However, the cross-sectional shape of the groove 20 has a sufficient radius as shown in FIG. Is done. Further, since the interval between the grooves 20 is also set as described above, the grooves 20 always bite the slab 2 to secure μ. Further, as shown in FIG. 2, the grooves 20 are formed symmetrically with respect to the center of the roll body length B, and each groove 20 has an inclination angle α with respect to the roll axis A. As a result, an action of moving the slab 2 inward is generated, and a self-centering action of automatically correcting the centering deviation of the slab 2 generated at the time of drawing is obtained.

[0010]

Since the pinch roll of the continuous casting machine according to the present invention is constructed as described above, the following effects can be obtained. That is, since each groove is formed so as to have an inclination angle that is not parallel to the roll axis direction and to be symmetrical with respect to the center of the roll body length, it is necessary to correct the bending of the cast slab to be drawn and obtain self-centering. Can be. Further, since the minimum and maximum values of the radius R and the interval between the grooves are determined for the cross-sectional shape of each groove, it is possible to prevent surface flaws at the time of drawing and to secure the value of μ by biting the slab. , It is possible to prevent a pull-out mistake.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a continuous casting machine according to the present invention.

FIG. 2 is an enlarged view showing the pinch roll of FIG.

FIG. 3 is an enlarged sectional view of a main part of the pinch roll of FIG.

FIG. 4 is a configuration diagram showing a conventional pinch roll.

FIG. 5 is a configuration diagram showing a conventional pinch roll.

[Explanation of symbols]

1 roll surface 2 slab A roll axis B roll body length D groove spacing R _1, R _2, R ₂ arc portion 20 groove

Continued on the front page (72) Inventor Yoshinori Yoshida 11-1 Showa-cho, Kure-shi, Hiroshima F-term in Nisshin Steel Corporation Kure Works (reference) 3J103 AA02 AA61 AA72 FA05 FA09 FA23 GA02 GA15 GA68 4E004 LC01 MC04

Claims (3)

[Claims] 1. A pinch roll of a continuous casting machine having a roll surface (1) in contact with said slab (2) for extracting a slab (2) cast by a continuous casting machine, wherein said roll surface (1)
A pinch roll for a continuous casting machine, characterized in that the pinch roll has a groove (20) that is symmetrical about the center of the roll body length (B) and has an inclination angle α with respect to the roll axis (A). 2. An arc portion (R ₁ , R 2) in a cross section of the groove (20).
R _2, pinch roll according to claim 1 continuous casting machine, wherein the R ₂₎ in is the arc of least radius R is not less than 5 mm. 3. The minimum value of the groove interval (D) between the grooves (20) is twice the radius R, and the maximum value (A) is A = 0.
5 × B _S × tan α (B _S is the cast slab to be drawn (2)
3. The pinch roll of a continuous casting machine according to claim 1 or 2, wherein