JP2835053B2 - Heat and wear resistant liner and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a crushing blade and abrasion resistance around a bell or chute dropping part, a sinter ore, and various lump crushing apparatuses in a raw material charging apparatus for a blast furnace. The present invention relates to a liner used in a place requiring high heat resistance and abrasion resistance such as hardware, and a method for producing the liner.

<Conventional technology> Ceramics have recently attracted attention as various heat and wear resistant members, but ceramics are generally inferior in impact resistance, and ceramics are still difficult to attach various structural members to desired parts. There are many problems.

By the way, white iron cast iron is a material that is superior in heat resistance and abrasion resistance and more impact resistant than ceramic, but it is very hard and has poor weldability, so it is difficult to install it in the desired place. Regarding the above point, it can not be said that there is much convenience as compared with the case of the above-mentioned ceramic.

The present inventors have previously provided a technique disclosed in Japanese Patent Application Laid-Open No. 59-232632 as a measure for solving the problems in mounting the white iron cast iron while taking advantage of its advantages.

<Problem to be Solved by the Invention> The technique disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 59-232662 certainly makes the method of attaching it to another desired portion simple, and the strength of the attaching portion is large. Although it can be done, it has been found that there are the following new problems in actual use. That is, in the liner disclosed in this publication, the connection between the outer tube and the inner filler is performed by a bulging portion that solidifies in a form in which the inner filler protruding outward through a small hole penetrating the side wall of the outer tube is expanded there. This is a problem caused by the fact that the bulging portion does not always have an ideal shape. More specifically, since the bulge has a shape that naturally occurs when molten white pig iron is solidified, it is ideally larger than the diameter of the small hole and not too large as shown in this publication. It is rare that the shape becomes less than the diameter of the small hole,
Alternatively, there are cases where the uniformity is not maintained due to the size being too large depending on the place and the reliability in use is poor. Furthermore, even if it is cast due to the characteristics of white pig cast iron, it cannot be expected to be completely metallurgically joined to the outer tube by itself. Therefore, since the outer tube and the inner filler have only a bulged portion and are mainly mechanically connected to prevent the slipping out, if the bulged portion is broken, the trapping effect of the horizontal hole is expected. Yes, but the bonding strength between them is weak. Naturally, the bulging part is made of white iron cast iron, which is more brittle than the outer tube, so it is easy to break, especially from the part corresponding to the neck of the bulging part and the internal filler. As a result, stress tends to concentrate on the small-diameter portion of the rising portion, and it is easy to break from any of the portions, resulting in a short life.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a liner which is easy to attach and has high durability and a method for manufacturing the same.

<Means for Solving the Problems> Means adopted to achieve the object of the present invention are as follows.

That is, as in claim 1, it is a cylindrical body made of carbon steel or low-alloy steel and having at least one open end, the cross section of which has at least one concave portion depressed inward. A liner comprising a pipe and an internal filler made of white pig cast iron cast and filled in an inner space of the outer pipe, or an ordinary cylindrical outer pipe as claimed in claim 2, wherein an open end of the outer pipe is used. And a liner which is welded between the outer tube and the inner filler or partially welded between a required portion of the side wall of the outer tube and the inner filler as in claim 3. In the case of the liner according to claim 1, at least one end of the liner is made of carbon steel or low-alloy steel, and the cross section thereof is formed. At least one concave inwardly concave shape
In the case of the liner according to claims 2 and 3, the outer pipe having a normal shape is prepared by preparing an outer pipe having a shape such that the outer pipe has a shape, and casting the molten white pig iron from the opening of the outer pipe to form an internal filler. White iron cast iron is cast and then the outer tube at the open end and the inner filling member are welded together, or a spot or linear welding process is performed from a required point on the outer surface of the outer tube side wall, and the outer tube side wall is welded. This is a method of partially joining with the internal filler.

Here, the shape of the outer tube of the liner according to claim 1 will be described in more detail. It is a cylindrical body having an open end at one end or both ends, and the overall cross-sectional shape of the cylindrical body is generally circular, square, or other shapes. It may have a rectangular shape, and such a cross-sectional shape has at least one or more concave portions that are further depressed inward. FIG.
As shown in (b) and (c), the outer tube 1 having various cross-sectional shapes has a concave portion 2.

In addition, the joining between the side wall of the outer tube and the inner filler is not particularly limited, such as spot welding or linear welding.

The outer pipe is usually made of carbon steel pipe for piping (SG
P) and the material of the internal filler is usually high Cr cast iron (C4.
5 ~ 5.0, Si <1.5, Mn about 1.0Cr28.0 ~ 30.0, Mo about 1.5, V about 1.5
(% By weight)).

<Operation> In the present invention, the outer outer tube is attached to, for example, a required portion of the bell by welding or other appropriate means, and after the outer tube is attached, the outer tube prevents the entire liner from being detached, and has heat resistance and abrasion resistance characteristics. Is taken over by the internal filler.

<Example> Hereinafter, the present invention will be described in detail with reference to examples.

Embodiment 1 FIG. 1 shows a partially cutaway perspective view of Embodiment 1 of the liner of the present invention. In the drawing, reference numeral 1 denotes a commercially available mild steel square pipe outer pipe, which has a shape in which the center of four sides of a rectangular cylindrical body is curved inward in this embodiment. The outer pipe 1 is filled with an internal filler 2 made of white pig cast iron.

The liner shown in FIG. 1 was manufactured by the following method.

That is, first, a commercially available mild steel square pipe having openings at both ends is mechanically deformed to form an outer tube 1 as shown in FIG. 1, which is buried in a sand mold, and is melted from an upper opening. White iron cast iron was cast and allowed to cool and solidify to form the internal filler 2.

Example 2 In Example 2, as shown in FIG. 3, a commercially available mild steel square tubular outer tube 1 having both ends opened was buried in a sand mold, and molten white pig iron was poured from the upper opening. Poured and allowed to cool and solidify to form the internal filler 2. Then, at both open end faces of the outer tube,
The outer tube 1 and the inner filler 2 are re-melted and joined by the TIG welding method to form an end face joint a.

Embodiment 3 In this embodiment 3, as shown in FIG. 4, a cylindrical outer tube 1 made of SGP and having both ends opened is buried in a sand mold, and molten white pig iron is poured from an upper opening and discharged. It is cooled and solidified to form the internal filler 2, and then re-melted by spot-shaped TIG welding from a required portion on the outer peripheral surface of the outer tube to form a side joint b. As shown in FIG. 5, the outer joint 1 and the inner filler 2 are connected to the re-solidification part 3 by the side joint b.
It was confirmed that they were firmly bound via the.

<Effects of the Invention> As described above, when the liner of the present invention is mounted on a bell or other appropriate part, the outer pipe is made of carbon steel or low alloy steel having good weldability and machinability. Therefore, any of a welding stop and a mechanical attachment using a bolt or the like is possible, and the attachment strength is large. In addition, this outer tube encloses the entire peripheral side of the inner filler,
Of course, if there is a gap between adjacent liners, even if there is a gap between adjacent liners, even if the upper part is worn, the side parts will not wear much and will remain for a long time This acts as a cushioning material and reduces the impact on the internal filler.

The inner filler in the outer tube having the role as described above expresses its original heat and abrasion resistance function after the outer tube portion coming on the upper surface is worn out, and the inner filler is in contact with the outer tube. The inner filler is peeled off because it is constructed so that it does not separate from each other by welding of the end face part, welding of the side part, or mechanical binding by the outer pipe having a concave part that is depressed inward. There is nothing. In addition, the internal filler is made of a relatively brittle white iron cast iron internal filler, such as the liner disclosed in Japanese Patent Application Laid-Open No. 59-232662, which is exemplified as the above-mentioned prior art. There are no thinner parts than other parts, so there is no fear of breakage or breakage and the whole is highly durable.

As described in detail above, the liner of the present invention joins the outer tube and the inner filler by welding and bonding the outer tube itself having the concave portion to the inner filler,
Needless to say, it is more preferable to use a plurality of types in addition to the three types individually.

Since the liner of the present invention can be obtained by casting a molten metal into the outer tube as described above, a liner of that shape can be obtained by forming the outer tube to be curved or tapered.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of a liner according to Embodiment 1 of the present invention,
2 (a), 2 (b) and 2 (c) are explanatory views showing various cross-sectional shapes of the outer tube, FIG. 3 is a partially cutaway perspective view of the liner of Embodiment 2 of the present invention, and FIG. FIG. 5 is a partially cutaway perspective view of a liner according to a third embodiment of the present invention, and FIG. In the figure, 1: Outer pipe 2: Internal filler 3: Re-melted solidified part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B22D 19 / 00,19 / 06 C21B 7/20 B23K 9 / 02,9 / 167

Claims (6)

(57) [Claims] 1. An outer tube made of carbon steel or low-alloy steel and having at least one open end and having at least one concave portion having a cross section depressed inward. A heat-resistant and wear-resistant liner comprising an internal filler made of white pig iron cast and filled into an inner space of an outer tube. 2. An outer tube made of carbon steel or low-alloy steel and having at least one end open cylindrical body, and an internal filler made of white pig iron cast and filled in an inner space of the outer tube. A heat-resistant and wear-resistant liner, wherein an outer tube and an inner filler are welded at an open end of the tube. 3. An outer pipe made of carbon steel or a low alloy, comprising an outer tubular body having at least one end open cylindrical body, and an internal filler made of white pig iron cast and filled into an inner space of the outer pipe. A heat-resistant and abrasion-resistant liner, characterized in that a portion between a required portion of a side wall of the inner wall and an inner filler is partially welded and joined. 4. An outer tube made of low-carbon steel or low-alloy steel and having at least one end having an open cylindrical shape and having at least one concave portion having a cross section depressed inward. A method for producing a heat-resistant and abrasion-resistant liner, comprising preparing and casting molten white pig iron from an opening of the outer tube to form an internal filler. 5. An outer tube made of carbon steel or low-alloy steel having at least one open end is prepared, molten white pig iron is cast from an opening of the outer tube to form an internal filler, and then an open end is formed. A method for producing a heat-resistant and wear-resistant liner, comprising welding and joining an outer tube and an inner filler material. 6. An outer pipe made of carbon steel or low alloy steel and having at least one open end is prepared, and molten white pig iron is cast from the opening of the outer pipe to form an internal filler. Manufacturing a heat-resistant, wear-resistant liner characterized by performing a welding process in a dotted or linear manner from a required portion of the outer surface of the side wall of the outer pipe and partially joining the side wall of the outer pipe and the inner filler. Method.