JPS6114012A - Ceramic roll for conveyance - Google Patents

Abstract

PURPOSE:To improve heat resistance and wear resistance by coupling a cylindrical body which is arrayed with metallic rings fitted with ceramic rings on the outside periphery and is thus fitted zigzag with the segments onto the core of a metallic roll shaft. CONSTITUTION:Segment receiving grooves 17 are arrayed at equal intervals on the outside periphery of the metallic rings 3. The ceramic segments 4 of which the end faces are made into an erecting trapezoidal shape are fitted into the grooves 17 to form unit toric body 5. Such bodies 5 are arrayed in contact with the axial line direction, by which the cylindrical body 5 arrayed with the segments 4 in a manner as to be serrated zigzag from each other is formed. Such body 6 is coupled into the core 2 of the metallic roll shaft.

Description

[Detailed description of the invention] The present invention is suitable for continuous casting in the iron and steel industry.

This patent relates to a roll used to support and convey high-humidity, high-weight materials in the early stages of blooming and hot rolling, and a composite roll partially constructed using a ceramic material.
``Heat resistance of rolls for this type of use Same as above, if the roll surface is made of ceramic for the purpose of long life, good results can be expected in many respects. However, the larger the ceramic material, the more difficult it is to form, and although it has excellent pressure resistance, it is weak against concentrated stress and H
On the other hand, since this type of roll bends under high loads, it is necessary to use a roll made of split ceramic bodies, and various composite roll structures have been proposed, as well as ceramic splitting methods and attachment means.

As one solution to this problem, Japanese Utility Model Application No. 59-25357 proposes ceramic segments in the form of regular trapezoids and inverted trapezoids that are subdivided in both the axial and circumferential directions of the roll. The figure shows a structure in which the roll surfaces are made entirely of ceramic by being assembled together and then bonded to the roll core metal. Because this ceramic roll relies in part on the mutual restraint of the segments due to the close assembly of the sub-segments, a problem arises in that failure or omission of one segment has a ripple effect on the joint attachment of adjacent segments.

The present invention has created a ceramic roll with a new structure that can overcome the weaknesses of the conventional ceramic rolls, and is constructed as follows. In other words, in one unit circular body, only ceramic segments in the shape of an upright trapezoidal surface with a reverse taper in the radial direction are used, and the metal rings are arranged in receiving grooves at equal intervals on the outer periphery of the metal ring. Fit each segment individually and securely attach the segments. Then, when sequentially fitting unit toric bodies in which ceramic segments are arranged at regular intervals in the circumferential direction onto the outer periphery of a metal roll glue core to form a cylindrical roll surface part, adjacent toric bodies are In between, the circumferential arrangement of the segments is given a contour so that the segments are arranged in a staggered manner.

Based on this arrangement, all the members are joined to the roll axis to form a partially ceramic roll.

Furthermore, in the present invention, the outer circumferential diameter of the row of ceramic segments fitted and attached in the 41st-position torus is set to be larger than the outer circumferential diameter of the land portion between the receiving grooves of the gold N ring. The area between the Tsukusedaments is depressed and a nine-land portion is interposed, and the outer peripheral surface thereof is exposed, and this exposed metal surface is covered with a ceramic coating. This coating protects the land area from the effects of radiant heat from the high-temperature material being transported.
Sakuru.

Furthermore, in the present invention, when installing the ceramic segment, the purpose is to absorb the difference in mature expansion allowance between the ceramic segment and the receiving groove and land portion of the J4 ring, and to absorb manufacturing errors. Appropriate gaps are created in advance for the purpose, and at least the gaps in the circumferential direction are filled with a heat-resistant ceramic coating material for installation.In this way, the ceramic segments will not fit inside the receiving grooves when the rolls are in operation. This prevents foreign matter such as scale from moving or getting caught in the gap.

The invention will now be described in detail with reference to embodiments shown in the accompanying drawings. FIG. 1 shows a partially longitudinal sectional front view of the ceramic roll of the present invention in an installed state.

The body of the ceramic roll (1) of the present invention is made of a strong metal material such as steel, and has a metal ring (3) and a ceramic segment ( A unit torus (5) consisting of the below-mentioned combination with 4) is sequentially fitted in a skewer shape to form a cylinder (6),
It is assembled by being clamped between the positioning shoulder (7) formed at one end of the shaft core (1) and the set ring (8) on the other end. A cushioning material (not shown) is incorporated into the mounting bolt (9) of the set ring (8) to absorb the difference in thermal expansion in the axial direction between the roll axis (2) and the cylinder (6). (Jitsukai Showa 5
9-25556).

A cooling water passage hole αQ is drilled at the center of the roll axis (2) #-t%, and g1 degree is maintained by nine-way water cooling, and the journal part (b) near both sides supports the shaft of the frame (6). It is rotatably supported and has a connection part σ4t- to the rotational drive part at one end.

(to) shows a cross section of a high-humidity material such as continuous casting H that is conveyed by rolls.

Figure 2 shows a perspective view of two unit toroids (5), the outer periphery of the metal ring (3) is equally spaced in the circumferential direction. A dovetail-shaped ceramic segment receiving groove (Qllt) penetrating the Qllt is engraved, and a ceramic segment (4) with an inverted tapered shape, that is, a trapezoidal side face shape, is fitted and installed in each receiving groove Qllt. . The outer circumferential diameter of the circumferential row of these segments is slightly larger than the outer circumferential diameter of the circumferential row of the land portion between the receiving grooves of the metal ring (3). Therefore Rand! The outer surface of Il (b) is slightly recessed than the outer surface of the ceramic segment (4). By doing this, high-humidity materials (g) such as continuous slabs can be placed on the outer circumferential surface of the ceramic segment (4). *The land part αη of the metal ring (3)
The outer peripheral surface of is separated from the slab (g) by a slight distance, and no heat transfer occurs due to direct contact. However, it receives radiant heat.

As a preferred embodiment of the present invention, as shown in Fig. 3.4, the outer peripheral surface of the land portion Qη of the metal ring (3) is coated with ceramic F! I (to) is applied, for example, by a thermal spraying method.

All ceramics to be coated are selected to have thermal properties and low heat transfer coefficients, and metal rings (
3) The entire outer circumference of the river surface that may be exposed ID1 ring (3)
), it maintains the strength of the shaft core (2), prevents the life from being shortened due to secondary oxidation corrosion, and also reduces heat loss from the high-temperature slab (i!). i11 will be fulfilled.

The metal ring (3) is the inner leg and the torque transmission key (2)
It is connected to the roll axis (2) by. this afternoon)
It is appropriate that the circumferential position of the key groove with respect to the receiving groove Ql has an angular phase difference of 1/2P between adjacent unit toric bodies.

When forming a cylindrical body (6) by aligning and abutting a predetermined number of unit toric bodies in the axial direction on the roll axis (2),
Those ceramic segments (4) are one torus segment) (4) as shown in FIGS. 6 and 4.
A) (4A) (segments of the adjacent torus when looking at V from the edge) Angle is given so that the segments C4B) are located, and the segments are staggered relative to each other as a whole. Gives a striking array. This arrangement is given by the phase difference of the keyway positions in the metal ring. This arrangement results in one torus (5A) ceramic segment (4A)
The ends of the rolls are sandwiched by the land portions (1711) (17B) of the rings of the adjacent toric bodies (5B) (5B) and are prevented from moving in the roll axis direction. Circumferential direction of external conductor of ceramic segment (4) - (b) t; I, but not limited to, land m
(It is better to make it equal to or higher than that of 171.

Segments (4) are arranged in a checkerboard pattern due to the staggered pattern. By doing this, the slab bearing area 6 of the segment can be increased and the installation strength can be sufficiently increased. (■ is the circumferential width of the bottom surface of the segment.

The ceramic segment (4) is constructed in the fourth section in consideration of the difference in thermal expansion l11i with the metal ring (3) and manufacturing errors. As shown in Fig. 5, when the metal rings are brought into close contact with each other in the axial direction, ceramic segments (4A) facing each other in the axial direction are formed.
Land portions of metal rings on both end faces and adjacent metal rings (17B)
(17B)) exists between the tapered surface of the ceramic ring (4) and the side surface of the receiving groove (6) that face each other in the circumferential direction. Dimensions are made so that 1i@ exists. When assembling, a filler such as a high-temperature ceramic coating material is inserted between the opposing surfaces 11υ. As the filler, a heat-resistant ceramic coating material that is heat-resistant, contains an antioxidant, has low thermal expansion, and has good dimensional stability is suitable, and is mixed with a hardening agent in the form of a powder, filled, and solidified.

Ceramic segments are generally used for their installation.

If there is a gap in the gap, the iron monoxide generated in the high-temperature casting will enter this gap as scale, and the foreign matter biting in the kernels will cause bending force to act on the mounting area of the ceramic segment. It is empirically known that this is a major factor in the failure of ceramic segments. Furthermore, if there is a gap, the ceramic segment can move freely within the gap, and when it comes into contact with the hot slab, it receives a large load in an unstable state, leading to stress concentration and damage. In the above embodiment of the present invention, the ceramic segment (4) is installed with the filler filled in the gap O1@, so that the intrusion of foreign substances such as scale is prevented, and the circumferential direction (fluctuation of No movement occurs even when a large, high-load torque is applied.This filling does not crack or oxidize even at high temperatures, and also functions as a gunbar that absorbs the difference in thermal expansion allowance.In this sense, the surrounding Filling the gap (2) in the direction is more important, and if a gap is provided between the bottom of the segment and the bottom of the receiving groove, there is no need to insert a filler.

It is.

As described above, according to the present invention, the contact with the high-temperature slab is made only through the ceramic segments, which is equivalent to a roll whose entire outer surface is made of ceramic, so that the heat resistance and wear resistance are improved.

The roll core bar is shielded from heat conduction and transfer from the hot slab. Therefore, the strength of the roll is maintained, the life of the roll is extended, and at the same time, the amount of heat removed from the hot slab is reduced. The ceramic segments are assembled individually (in a stable manner), so there is little chance of damage, and even if one is damaged, it will not affect the attachment of the others, so it is possible to continue using the roll as is. Therefore, the illuminance needed to replace rolls, which were conventionally treated as consumables, is greatly reduced, improving line productivity.In addition, roll replacement, maintenance work, and repair work are easier and faster, and roll reserve allowances are reduced. Effects such as a significant reduction in the amount of water needed are obtained.

[Brief explanation of drawings]

Fig. 1 is a partial longitudinal sectional front view of a conveying ceramic roll according to an embodiment of the present invention in an installed state, Fig. 2 is a perspective view of one of the unit toruses, and Fig. 3 is a view between adjacent unit torus bodies. Partially enlarged end view showing staggered arrangement of ceramic segments, No. 4
The figure is a partially enlarged longitudinal sectional view showing the arrangement of the ceramic segments in the roll axis direction, and FIG. 5 is a partially enlarged end view showing the attachment relationship between the roll segments and the metal ring. (1)...Ceramic roll% (2)...Roll axis core,
(3) Curved metal ring, +4) (4A) (4B)
・Ceramic segment, (5 (5A) (5B)・
・Unit torus, (6)...Cylinder, (7)...Shoulder, (
8)...Centering ring, (9)...Mounting bolt, shout...
Cooling water passage hole, (B)... Journal part, (6)... Frame, (to)... Bearing, Q41... Connecting part, ), φ slab %... Receiving groove, α ( 17B)...land part, ni)・
・Ceramic defecation, (to) fist/key, (2)...
Gap filling, ψ)...Segment installation 1 inch (b)
---t Gume 7 Outer turret circumferential width () CB)...Segment bottom width. Kurashi, 2 Figure 31nj Wei 5jij

Claims (1)

[Scope of Claims] 1) Segment receiving grooves are arranged at equal intervals in the circumferential direction on the outer periphery of a metal ring that fits on the outer periphery of the metal roll shaft core, and each receiving groove is made of ceramic with an erect trapezoidal end face. A unit torus is formed by fitting the segments so that the outer circumferential diameter of the circumferential row of the fitted segments is larger than the outer circumferential diameter of the metal ring, and the unit torus is connected to the ceramic of the adjacent unit torus. A ceramic for conveyance, characterized in that the segments are arranged in a staggered manner and brought into contact with each other in the axial direction to form a cylindrical body, and the cylindrical body is joined on the shaft core of a metal roll. roll. (2) The ceramic roll for conveyance according to claim 1, characterized in that a ceramic coating is applied to the outer peripheral surface of the land portion between the segment receiving grooves of the metal ring. (3) The ceramic segment is a receiving groove of the metal ring,
The ceramic roll for conveyance according to any one of claims 1 and 2, characterized in that at least a part of the gap facing the land portion is filled with a heat-resistant filler.