JPS59232662A - Heat- and wear-resistant liner and its production - Google Patents

Abstract

PURPOSE:To obtain a heat- and wear-resistant liner by filling an internal packing material of a white pig cast iron into the space in an outside pipe and the small holes thereof and bulging the packing material through the small holes to the outside circumferential wall. CONSTITUTION:Many small holes are opened to the circumferential wall of an outside pipe 1 formed of a carbon steel or low alloy steel and the outside pipe is embedded in a sand mold. A white pig cast iron material in a molten state is cast into the pipe through the open port at the top. The white pig cast iron material fills the inside of the pipe 1 and flows into the small holes as well. Bulging parts 5 are formed at the points where said material projects from the small hole and are solidified in this state. The highly durable liner is easily attached on the spot, i.e., by an on-site work, to the places where various kinds of heat- and wear resistances are required.

Description

DETAILED DESCRIPTION OF THE INVENTION In accordance with the present invention, bells and movable armor rows (such as crushing blades for crushing coke and various [414-like materials) in equipment for charging raw materials into blast furnaces, etc. This invention relates to a liner used in areas where ?1ifi characteristics are required, and a method for manufacturing the liner.

Ceramic iron has recently been used as a variety of heat-resistant and wear-resistant materials.
1′.

However, ceramics still have many problems, such as poor impact resistance and difficulty in attaching various groove members to desired locations.

By the way, white pig iron is a material that has excellent heat resistance and wear resistance, and has greater impact resistance than the ceramics mentioned above (although white pig iron is very hard and does not have good weldability), so it can be installed in the desired location. In this case, for example, the hole U of the bolt hole for bolt fixing is difficult to attach. Bring the mating part to the doffing station to which you want to attach the part.
The only way to do so was to directly fish for white pig iron, which was not practical.

The present invention eliminates the above-mentioned problems, and provides a liner and its manufacturing method that utilizes the excellent properties of white pig iron itself, such as heat resistance and wear resistance, and also provides various 131 with low processing and weldability. This is what we aim to do.
The gist is an outer tube made of carbon steel or low alloy steel that is open at least at one end and has many small holes penetrating its peripheral wall, and a white tube that is cast and filled into the inner space and small holes of the outer tube. The inner filling material passes through the small hole and slightly overhangs the outer circumferential wall of the outer tube, forming a bulge in the outer circumferential wall that is slightly larger than the diameter of the small hole. A heat-resistant, abrasion-resistant liner characterized by a heat-resistant and abrasion-resistant liner that is solidified with , buried in a hollow sand mold with its open end facing upward, and pouring molten white pig iron cast iron lumber 1 from the open end so that the molten phase fills the inner space and the small hole of the outer pipe, and A method for producing a heat-resistant and abrasion-resistant liner, which is characterized in that the liner slightly overflows from the small hole to the outer circumferential wall of the outer tube and solidifies into a state where the outer circumferential wall has a bulge slightly larger than the diameter of the small hole. be.

The present invention will be described in detail below with reference to the drawings.

Figure 1 shows an outer tube made of carbon steel or low alloy steel (1
), and there are many small holes (2) in the peripheral wall of the outer tube.

(2), is opened.

Note that this outer tube (1) does not rub even if it has a rectangular shape other than a cylindrical shape as shown in Figure 1, and if one end is open, the other end can be open. There is no problem even if it is bottom-shaped.

The outer pipe (1) as shown in Fig. 1 is buried in a sand mold (3) as shown in Fig. 2, and molten white pig iron cast iron material (4) is poured into the sand mold (3) from the opening at the top. Cast iron material is the outer tube (1
), and also flows into the small holes F21, +21, (7), forming a bulge (5) at a part of the small hole (2+, (2+), slightly protruding from the small hole F21, +21, and solidifying). For this purpose, the tamping strength of the sand mold (3) used, the pouring temperature of the white pig iron cast iron material (7I), etc. are adjusted appropriately.The liner of the present invention obtained in this way is shown in Figs. 3 and 4. As shown, inside the outer tube (1) there is an inner filler (5) made of solidified molten white pig iron material (4), and the inner filler (5) has a large number of small pieces. Hole f21, +2
1. It penetrates into the inside and protrudes from the outer peripheral wall of the outer tube (1), where it forms a bulge (5) larger than the diameter of the small hole (2).
).

The material for the outer tube (1) is usually carbon steel pipe (SGP) for piping, and the material for the inner filler (5) is usually high Cr1Q iron (C4.5-5.0, Si< 1.
5, Mn 1°OCr28.0-30.0, Mo approx. 1.
5, V approximately 1.5 (wt%)).

The liner of the present invention described above has an outer tube made of carbon steel or low-alloy steel that has excellent machinability and weldability, and is made of white pig iron cast iron that is heat resistant and wear resistant. As mentioned above, since the inner filler is filled in the bulge part with a strong joint like a type of rivet joint, when the liner of the present invention is attached to a desired part of a bell, for example, it can be easily welded and fixed. In addition to welding, it is also easy to drill holes for bolting and other machining.
Moreover, after being installed in this way, the outer tube, which has low heat and abrasion resistance, will wear out and be damaged with use, but the internal filler made of white pig iron cast iron has high heat and abrasion resistance. The inner filler will not peel off unless the outer tube surrounding it is completely worn out. If it is installed and used by welding or other necessary means, the outer tube will hardly wear out in the lower part, that is, on the mounting side and side parts, so in fact, it can be used as long as the inner filling material can withstand it.

Therefore, according to the present invention, there is an effect that a highly durable liner can be easily attached on the spot, that is, in a laboratory work, to parts where various heat resistance and abrasion resistance are required.

In addition, the present invention is obtained by pouring molten metal into the outer tube in a manner similar to two series, so if the outer tube used is curved or tapered, it is possible to use a liner with that shape.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the outer tube of the liner of the present invention. FIG. 2 is an explanatory diagram showing the manufacturing method of the liner of the present invention. FIG. 3 is a partially cutaway rI view of the liner of the present invention. An enlarged sectional view of the same main part. In the figure, (1): Outer tube (2): Small hole (5): Swelling part (6): Internal filler north 1 Question 3 Figure r152 Figure': 5 4 -

Claims (1)

[Scope of Claims] 1. Carbon m or low alloy m whose at least one end is open and has many small holes penetrating its peripheral wall? ! ! an outer tube of
It consists of an internal filling material made of white cast iron that is filled into the internal space of the outer tube and the small hole, and the internal filling material penetrates the small hole and slightly overhangs the outer peripheral wall of the outer tube. A heat-resistant and abrasion-resistant liner characterized by a solidified wall with a bulge slightly larger than the diameter of the small hole. 2. An outer tube made of carbon rust or low alloy steel, which has at least one end open and has a large number of small holes penetrating its peripheral wall, is inserted into the open end 1. It is buried in a sand mold so that θ is facing upward, and molten white pig iron cast iron material is poured into the sand mold from the open end of the mold, and the molten material fills the internal space and small hole of the outer pipe, and then flows through the small hole to the outer circumference of the outer pipe. A method for producing a heat-resistant and abrasion-resistant liner, which is characterized by solidifying the liner so that it slightly overflows into the wall and has a bulge on the outer peripheral wall that is slightly larger than the diameter of the small hole.