JPH0622986B2 - Method for manufacturing metal objects for ingot cooling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a grate used for a cooling device for cooling an ingot immediately after firing a cement raw material in a rotary furnace,
More specifically, the present invention relates to a method for manufacturing a metal product such as a side wall metal product, and more particularly to a method for manufacturing a metal product for an ingot cooling device having a long life.

[Conventional technology]

An explanation will be given by taking as an example a grate and a side wall metal article for cooling the ingot produced when the cement raw material powder is fired in a rotary furnace.

The ingot, or clinker, fired in a rotary furnace is a grate (fixed plate) consisting of a fixed grate and a movable grate.
Fall on. The ingots on the grate are cooled by the air supplied from the lower part of the grate through a large number of air holes drilled in the grate while being sequentially sent to the outlet side by the reciprocating motion of the movable grate. Also, at both ends of the movable grate,
In order to prevent air from blowing through and a slab from falling through the gap between the movable grate and the lateral wall, a side wall metal article having an eaves portion is installed at a position where the reciprocating motion of the movable grate is not hindered. .

Since the grate and the side wall metal near the outlet of the ingot are exposed to the ingot at a high temperature of 1200 ° C. or higher, heat resistance and oxidation resistance and wear resistance at high temperature are required. Therefore, the material of the grate and the side wall metal on the high temperature side is SCH1.
Heat-resistant and wear-resistant cast steel such as No. 3 is used.

[Problems to be solved by the invention]

The ingot that has been fired in the rotary furnace has a phenomenon that when it falls into the cooling device, the particle size selection effect occurs, and those with small particle size gather on the downstream side in the rotating direction of the rotary furnace. There is a place where the air flow is bad due to the position of, or partial retention of the ingot. The grate and side wall metal fittings in places with poor air circulation are heated to a high temperature, and due to melting damage and high temperature wear, it is unavoidable to suspend the rotary furnace during operation and perform replacement work. It had been.

The present inventors have studied the method of coating the surface of the grate and the side wall metal article with ceramics, which is a member having excellent heat resistance and wear resistance, in order to improve the durability of the grate and the side wall metal article. As a method, there is a method of spraying ceramic powder on the grate and the side wall hardware, a method of directly casting steel on the ceramic, a method of directly bonding the ceramic and the grate and the side wall metal with an adhesive agent. There is a problem in that the layer has a large porosity and thus has a large abrasion property. In the case, the difference in thermal expansion is large and the ceramic and the steel are separated from each other, and in the case, the adhesive strength is insufficient.

[Means for solving problems]

In order to solve the above problems and to obtain a grate whose surface is coated with ceramics having excellent heat resistance and wear resistance, a side wall metal article, etc., the present invention provides an ingot cooling device in which a high temperature ingot falls and collides. Ceramics are sprayed onto at least a part of the surface of the metal of the grate and the side wall to form a ceramics sprayed layer, and a ceramic plate is bonded to the surface of the ceramics sprayed layer using an inorganic adhesive. The present invention provides a method for manufacturing a metal product for a slab cooling device.

[Action]

This will be described with reference to the drawings of the present invention. FIG. 1 is a schematic end view of a vertical cross section of a grate manufactured by the method of the present invention, and FIG. 2 is a schematic end view of a vertical cross section of a side wall metal product manufactured by the method of the present invention. Is a ceramic sprayed layer, 3
Is an inorganic adhesive, 4 is a ceramic plate, 5 is a side wall metal body, and 6 is an eaves portion.

When the grate is manufactured by the method of the present invention, a ceramic sprayed layer on the surface of the grate body made of steel, an inorganic adhesive,
By forming a superposed layer of ceramic plates, the surface layer can be made of ceramics. In other words, regarding the difference in the thermal expansion properties of steel and ceramic plates, by interposing a porous sprayed layer, the thermal conductivity is reduced and the thermal expansion of the grate body made of steel is suppressed, and the ceramic sprayed Since the film is flexible, it has good followability against deformation even if the grate body is deformed by heat. Furthermore, since the ceramics are bonded to each other by interposing the thermal sprayed layer, the stress due to the difference in thermal expansion is hardly received. Therefore, the bonding strength becomes larger than that when the steel and ceramics are directly bonded. It has become possible to use ceramics for the surface layer of the lattice. Further, it became possible to make the surface layer of the side wall metal article into a ceramic by the same method.

The ceramic forming the ceramic sprayed layer of the present invention has heat resistance and has a strength capable of adhering a ceramic plate by using an inorganic adhesive, and has a thermal expansion coefficient of 8 × 10 ^−6. Materials such as alumina, spinel, and zirconia, which are high-expansion materials described above, are preferable, and zirconia-based ceramics having a small thermal conductivity are particularly preferable.

The thickness of the ceramic sprayed layer may be a thickness that can follow the difference in thermal expansion between the sprayed ceramics layer and steel,
About 0.5 mm is suitable.

The porosity of the ceramic sprayed layer is preferably about 3 to 8% in consideration of the strength of the sprayed layer.

Examples of the thermal spraying method include gas plasma thermal spraying, water plasma thermal spraying, flame thermal spraying and the like, but the method is not particularly limited as long as it is a method satisfying the above thermal spraying conditions.

The inorganic adhesive used in the present invention is not particularly limited as long as it has the necessary heat resistance and can bond the ceramic sprayed layer and the ceramic plate, and When the same inorganic substance as the main component is used as the main component, the ceramic plate and the inorganic adhesive have the same thermal expansion property, and therefore there is no fear that the ceramic plate will peel off, which is preferable.

The main component of the ceramic plate used in the present invention is not particularly limited as long as it has heat resistance and wear resistance, and the ceramic plate can be bonded with an inorganic adhesive, and the alumina plate , Zirconia, silicon nitride, silicon carbide, sialon, etc. are suitable because of their high heat resistance and wear resistance.

The size and thickness of the ceramic plate are appropriately selected in consideration of the shape and size of the metal object.

The formation of the ceramic sprayed layer, the inorganic adhesive and the ceramic plate may be performed at a position where it contacts the ingot, and in the case of a grate, it is not necessary to bond the ceramic plate to the entire surface. For example, as shown in FIG. 1, the grate may be formed only on the surface in contact with the ingot.

〔Example〕

A ceramic sprayed layer is formed by spraying ceramic powder containing zirconia as a main component to a layer thickness of 0.5 mm by a water plasma spraying method on all surfaces of the grate body made of SCH-13 steel that contact the ingot. Then, using an adhesive (manufactured by Shinagawa White Brick Co., Ltd., product name TAC-AP) containing alumina as a main component on the surface of the ceramic sprayed layer, a plate made of alumina ceramics having a thickness of 8 mm (manufactured by Shinagawa White Brick Co., Ltd., Product name A
99) to produce a grate having the formation shown in FIG. 1, and to the surface contacting the ingot of the side wall metallization made of SCH-13 steel, by the same method as in the grate. The formation shown in the figure was formed.

Even if the grate and the side wall metal fittings are installed in a cooling device that cools the ingot immediately after firing the cement raw material in a rotary furnace and used for several months, the ceramic plate does not peel off and wear is minimal. Expected to be used for a long time.

〔The invention's effect〕

It has been found that the following excellent effects can be obtained by using ceramics having high heat resistance and wear resistance for the surface layer of the metal for the ingot cooling device.

The wear of the metal for the ingot cooling device has almost disappeared, the life has been greatly extended, and the number of outages for replacing the metal has been reduced, thereby improving productivity and reducing heat consumption.

Due to the improvement in durability, the number of replacements of the metal parts at the time of rest is reduced, so that the maintenance and inspection cost can be reduced.

As the steel used for the metal body, it has become possible to use inexpensive steel having lower durability than before.

[Brief description of drawings]

FIG. 1 is a schematic end view of a longitudinal section of a grate manufactured by the method of the present invention, and FIG. 2 is a schematic end view of a vertical section of a side wall metal product manufactured by the method of the present invention. 1 ... Grate body 2 ... Ceramic sprayed layer 3 ... Inorganic adhesive 4 ... Ceramic plate 5 ... Sidewall metal body 6 ... Eaves

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masayasu Yamazaki Inventor Masayasu Yamazaki 750 Komori, Kokuraminami-ku, Kitakyushu, Fukuoka Mitsubishi Mining & Cement Co., Ltd., Kyushu Works, Higashidani Plant (72) Inventor, Youji Fujii Minamikoto, Okayama, Okayama 134-132 (72) Inventor Hiroyuki Sugimoto 656 Taiyomura, Kashima-gun, Ibaraki Prefecture (56) References JP-A-55-130756 (JP, A) JP-A-60-25743 (JP, A)

Claims (1)

[Claims] Claim: What is claimed is: 1. A ceramic sprayed layer is formed by spraying ceramics on at least a part of the surface of the metal of the grate and the side wall of the ingot cooling device where a high-temperature ingot falls and collides, and a ceramics sprayed layer is formed on the surface of the ceramics sprayed layer. A method for manufacturing a metal product for a slab cooling apparatus, which comprises bonding ceramic plates with an inorganic adhesive.