JPS5956957A - Device for guiding and conveying cast billet - Google Patents

Abstract

PURPOSE:To prevent the generation of segregation by providing two sets of walking bars which hold a billet therebetween from above and below, and guide the billet near the part where the solidification of the billet ends so that the walking bars which have released the billet upon completion of the walking are fed backward to the position where the billet is held. CONSTITUTION:A billet S is tracked and driven by pinch rolls 23 and is held therebetween by, for example, outside walking bars 4. The upper and lower walking bars 4 walk in an arrow direction while holding the billet S, and when the billet arrives at the prescribed position in the region where the oscillation of a support shaft 9 for an eccentric shaft is permissible, the holding of the billet S which has been attained by the eccentricity of the shaft 8 is released by the succeeding rotation of the shaft 8. Inside walking bars 5 hold the billet S and guide and convey the same during this time. The bars 5 are moved in the opposite direction by the operation of a cylinder 14 for returning the inside bars and are returned to the position where the billet S has been held before the billet S is held by the same.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a device for holding and guiding slabs for rolling in a continuous casting line.

Since the continuous casting method can be expected to reduce production costs and improve yield, numerous improvements and studies have been made to expand the scope of its use and to improve the quality of slabs. Steel materials for cold regions, steel materials with good weldability, provided based on quality requirements.
High-grade steels such as stress-induced cracking steels are already manufactured by continuous casting without the need for steel ingot blooming, but there is no end to new demands for steels with even higher quality materials. .

As is well known, segregation and the presence of inclusions are the basic defects of slabs produced using the continuous casting method, and the current slabs have these basic defects reduced to a state where they are almost harmless.

However, as a result of various side effects, we realized that there was still room for improvement in making the slab harmless, so we installed a slab guide with a function that contributes to further rendering the slab harmless. It is an object of the present invention to provide and meet the above requirements. More specifically, the present invention further improves the quality of slabs, further renders segregation harmless, and furthermore, U15, provides a section clamping guide conveyance device that prevents the occurrence of secondary defects in slabs. The purpose of the misfire ψ is to provide.

Regarding the detoxification of inclusions remaining in the vj piece, the device of the present invention has no favorable effects or effects, as well as contributing to the detoxification of even more advanced segregation. 1. ing.

The guiding and conveying device of the present invention, which can effectively meet the above requirements, has the following features: (1) Two sets of walking bars that clamp and guide the slab from above and below hold at least the vicinity of the solidified slab part on the paternal side. It is set up so that it can be released.
By the guiding and conveying force applied to the slab, each of the walking bars that clamp the slab is killed so as to be able to walk, and then the walking bar is completed, and the clamping of the slab is released, and each of the walking bars clamps the slab. 1. A slab guiding and conveying device, characterized in that it is installed in a position where a bow is held so that it can be fed backwards.

(2) The slab guiding and conveying device according to (1) above, in which the walking speed of the walking bar and the clamping/releasing cycle of the walking bar can always be synchronized in a constant relationship.

(3) The slab guiding and conveying device according to (1) above, in which the walking speed of the walking bar and the clamping and releasing cycles of the walking bar are independent and asynchronous.

2 Below, the guiding and conveying device of the present invention will be described in detail based on the drawings showing embodiments of the device of the present invention.

FIG. 1 is a front view of the slab guiding and conveying section of the guiding and conveying device according to the embodiment of the present invention, FIG. 2 is a partially sectional side view of FIG. 1, and FIG. 3 is the entire guiding and conveying device of this embodiment. It is a front view.

In Fig. 1.2.3, 1 is a foundation, 2 is a main frame that stands upright on the foundation, and 3-1 is a back stay for an inner bar that is rotatably attached to the eccentric part of an eccentric shaft 7, which will be described later. ,3
-2 is a back stay for the outer par that is rotatably attached to the eccentric part of the eccentric shaft 8 described later, and 4 is attached to the back stay 3-2, which are located above and below the slab S, respectively, and cooperate with each other. A walking outer par (hereinafter referred to as outer par) 5 that holds the slab is attached to the backstay 3-1.
There are hinoki cypresses above and below, which work together to hold the slab.
” Connecting bar for the inner par that connects the two inner pars 5.5, 6-2 is the connecting par for the outer par, 7 is the upper and lower eccentric shaft for chucking the inner par. , 8 are upper and lower eccentric shafts for outer par chucking, and 9 is an upper inner par eccentric shaft 7 that is swingable in parallel to the advancing direction of the slab S and attached to the upper frame 11 The support mechanism 10 that supports and pulls the eccentric shaft 8 for some of the outer bars to the support machine +11 that supports the eccentric shaft 8 for some of the outer bars so as to be swingable in the same direction as the eccentric shaft 7; mounted on the upper part of the main body frame and pushed downward by a hydraulic pressure reduction cylinder 12;
A two-part frame 13 is rotatably attached to the eccentric shafts 7 and 8, and a rolling wheel is in contact with the lower surface of the upper frame; 14 is provided on the upper frame, and together with the slab Cylinder for returning the inner par of the walking pad to its old position (the cylinder for returning the outer par is not shown), 15u piston rond of the cylinder,
Reference numeral 16 denotes a link mechanism connecting the piston rond and the shaft layer link 18 described later; 17 denotes a circumferential link for transmitting the operation of the link mechanism 16 to the eccentric shaft 7 for fixing to the side surface of the upper frame 11; and 19 denotes a link. This is the connecting pin used in mechanism 16.18. Next, in FIG. 3, 20 is a drive device for the eccentric shafts 7 and 8 for chucking, 21 is a clamp cam box for driving the eccentric shafts 7 and 8 connected to the 1 drive device 20, and 22 is the clamp cam box for driving the eccentric shafts 7 and 8. 1 from cam box
This is a box that distributes drive to the upper and lower axes of the eccentric shafts 7 and 8, respectively, and in FIG. 2, 23 is a pinch roll, and 24 is an idle roll.

In the apparatus of this embodiment configured as described above, the tracking drive of the slab S is performed by the pinch rolls 23. For example, the slab S is held between the outer pars 4 (first-
3), the upper and lower outer pars 4 hold the slab S and walk in the direction of the arrow (Figure 2) according to the progress of the slab S being conveyed by the pinch rolls. When the outer par 4 has moved a predetermined distance (determined by the rotational speed of the eccentric shaft and the feed speed of the pinch roll) within the swinging allowable range of the eccentric shaft support mechanism 9, the eccentric shaft is Given by No. 9. The clamping of the slab S, which had been held, is unraveled 7 by the continued rotation of the eccentric shaft, and during this time the inner bar 5 is clamping the slab S, and the inner bar 5
Similarly to the outer bar 4 described above, the slab S is held and guided and conveyed.

Inner par 5 performs the following operation prior to clamping the slab. While the outer par 4 is moving together with the slab, the inner bar 5 is rotated by the operation of the inner bar return cylinder 14.
, the upper backstay 3 via the link mechanisms 16, 18 and the upper eccentric shaft 7, and the lower backstay connected to the upper backstay 3 via the connecting par 6-1, both of which are opposite to the arrows. direction, returned to the old position, and held in place as the slab advances.

Outside walking or inside par 4 or 5 Chutsuki Nobu,
That is, in this example, the timing of clamping is determined by the driving speed of the drive device 20, that is, the rotation period of the eccentric shaft 7 or 8, but it is preferable to synchronize the rotation period with the slab S guiding and conveying speed of the pinch rolls 23. good.

The slab S clamping surface of the outer or inner par 4 or 5 of the apparatus of this embodiment is made of a heat-resistant material, making it possible to guide and convey the slab S at a temperature of 900° C. or higher.

The slab S that is guided and conveyed in the manner described above is sequentially subjected to pressing driving force by the group of pinch rolls 23 of the conventional device in the vicinity of the solidified slab part, and in addition to this, the slab Since it receives the uniform compressive force given by the inner pars 4 or 5, it is possible to prevent the inner side of the entire slab S from bulging which may occur. Ko'i
'l- is to prevent secondary defects that occur when the apparatus of the present invention transports hot slabs S to directly send them to a rolling process or directly to a heating furnace.

Furthermore, due to the compressive force that is successively applied to the entire slab by the apparatus of this embodiment, the slab S becomes 05 to 2, Q m,
While being guided and conveyed at a speed of 7 mm, the slight segregation that inevitably occurs in the slab S is diffused and made even lighter, so that the detoxification is further advanced and improved.

During the segregation and diffusion of sulfides, phosphides, and carbides, the diffusion of sulfides, phosphides, and carbides also progresses, and the inclusions inevitably formed by these are further rendered harmless.

This action and effect can be obtained by installing the device of the present invention at least in the part where the slab solidification is completed. As is well known, molten steel with high impurity concentration near the solidified part does not solidify in a stationary state, and due to fluctuations in the support interval of the slab S or the occurrence of bulging, the unsolidified inside of the slab S Segregation occurs when molten steel with a high impurity concentration flows into that area when the volume is expanded. This is because by adding , the enlarged portion can be crushed and the occurrence of segregation can be eliminated.

The installation of the device of the present invention is not limited to the vicinity of the unsolidified portion as described above, but may be installed upstream of the solidified portion where the above operations and effects can be brought about. In addition to the device described in the second embodiment, a spring mechanism may be used as the device for returning each par used in the device of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a front view of a slab guiding and conveying section of a guiding and conveying device according to an embodiment of the present invention, FIG. 2 is a partially sectional side view of FIG. 1, and FIG. It is an overall front view. 3-1, 3-2... Backstay for walking par (inner, outer), -4... Walking outer par, 5... Inner walking par, 7... Eccentric shaft for inner par chucking, 8... Eccentric shaft for outer par chucking, 9... Upper inner par support mechanism, 14 Inner par return cylinder, 20.
Eccentric shaft drive. Agent: Patent attorney Masaaki Akizawa, Mitsugai (2 people)

Claims (1)

[Scope of Claims] () Two sets of walking parlors that hold and guide the cast slab from above and below, or are provided so as to be able to alternately hold and release the slab at least in the vicinity of the solidified part of the slab; −−11 poem 1ゝ゛−
``''-The guiding and conveying force applied to the 91 pieces holds the slab [...] Each of the above-mentioned walking bars is provided so as to be able to walk. A slab guiding and conveying device characterized in that each of the walking pars is provided so as to be able to be fed back to the position where the slab is clamped. (2) Walking speed of the walking pars and clamping/releasing cycle of the walking bars. is always the same I with a constant relationship
The apparatus according to claim 1, which enables JI. (3) The device according to claim 1, wherein the walking speed of the walking bar and the clamping/releasing period of the walking bar are independent and asynchronous.