JPH0446661A - Ceramic-made pipe inserting a part thereof as cast-in - Google Patents

Abstract

PURPOSE:To firm bonding of a pipe and a casting by forming an inserting metal part with an annular part and a sleeve part and arranging slit opening the other part in the sleeve part. CONSTITUTION:A ceramic-made pipe is constituted with the ceramic-made pipe 12 and the inserting metal part 11 arranged at a part thereof. Then, the inserting metal part 11 is formed with the annular part 13 and the sleeve part 14. Further, the slit 15 opening the other end in the sleeve part 14 is arranged. The ceramic-made pipe is exposed at both sides of the inserting metal part and the sleeve parts are formed at both sides of the inserting metal part. The inserting metal part is constituted with cast iron or cast steel. By this method, even if this is used at high temp., as the holding force is not eliminated, in the case of using this at the high temp., e.g. this can be used as supplying pipe for molten aluminum.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a technique for rust-covering a part of a ceramic pipe (hereinafter referred to as a pipe) with metal.

(Prior art) When a part of a pipe is wrapped in a circular ring without a stress buffer layer, the part of the pipe that is exposed from the metal part (hereinafter referred to as the metal part) (hereinafter referred to as the boundary part) has a large stress system inside the pipe. may be destroyed.

In order to prevent breakage, there is a method of installing a cushion layer between the metal part and the pipe to reduce the stress, but with repeated use, the cushion layer gradually loses its elasticity, causing the pipe to fall out from the metal part. there were.

(Problems to be Solved by the Invention) In view of the above problems, the present invention has been made with the object of obtaining a ceramic pipe in which a part of the pipe is covered with metal without using a cushion layer.

(Means for solving the problem) An annular portion 13 is provided on the side of the metal portion 11 where the pipe 12 is exposed.
A thin-walled sleeve portion 14 is provided integrally with the pipe 12.
The above problem was solved by providing the sleeve portion 14 with a slit 15 that opens on the exposed side.

The shape of the slit 15 is not limited to a rectangle,
The slit 15 may be fan-shaped (Fig. 3) or oval (Fig. 4), and the orientation of the slit 15 is not limited to parallel to the axis of the pipe 12, but may be twisted with respect to the axis (Fig. 5). ).

The outer diameter of the sleeve portion 14 does not need to be constant, and may increase as it approaches the annular portion 13.

There are no restrictions on the metal that makes up the metal parts, and depending on the purpose, cast iron,
Cast steel etc. can be selected.

(Function) When the molten metal solidifies and contracts, compressive stress is applied to the pipe due to the difference in thermal elongation between the metal and the ceramic.

When the sleeve portion 14 with the slit 15 is provided in the metal portion 11 as shown in FIG.
Because of this, the stress spreads outward toward the exposed side of the pipe 12, so that the stress gradually decreases from the boundary between the annular portion 13 and the sleeve portion 14 to the boundary portion 16, and stress concentration is weakened.

(Example) Hereinafter, the present invention will be explained in more detail based on examples.

Example 1: 3% by weight of ferric oxide and 15% by weight of mullite after sintering
It is molded using a slip made by mixing kaolin powder and alumina powder in the amount necessary to obtain the desired amount, and the remainder (82% by weight) of alumina powder and titania powder in a molar ratio of 1:1. Outer diameter 100mm sintered at 1600℃
An aluminum titanate vibro 2 having a thickness of 6 mm and a length of 150 mm was prepared. Pour molten spheroidal graphite cast iron equivalent to FCD45 at 1418°C around the vibro 2 at room temperature, and cast the pipe to a thickness of 5 mm on the entire outer periphery (Fig. 6), confirming that this pipe can be cast. Did 0
Next, pipe 1 which has the same manufacturing method and dimensions as the above pipe.
2, the annular portion 13 of the metal portion 11 has an outer diameter of 1 as shown in FIG.
80mm, thickness 20mm, sleeve part 14 length 40m
m, thickness 3.5 mm, width of slit 15 7. The mold was placed in a mold with a diameter of 40 mm, a length of 40 mm, and 6 slits, and a molten spheroidal graphite cast iron equivalent to FCD45 at 1410° C. was poured into the mold. No cracks occurred in the pipe.

In addition, cast iron with a high 2.y Kel content was also cast using a mold having the same shape as the above mold, but no cracks occurred in the pipe of this pigeon loft either. The final composition of this cast iron is C: 23%, Si: 2.2%, Mn: 0.4%
, Ni: 35%, Cr: 2.5.

Example 2: The manufacturing method is the same as Example 1, outer diameter 100 mm, thickness 6
As shown in FIG. 7, a pipe 72 with a length of 300 mm is provided with a metal part 71 in the center of the pipe 72, and an annular part 73 with an outer diameter of 180 mm and a thickness of 20 mm. A sleeve part 74 with a length of 40 mm and a thickness of 3.5 mm is provided on both sides of the sleeve part 74, and the sleeve part 74 is placed in a mold formed to provide six slits 75 each with a diameter of 7 mm and a length of 40 mm. It was cast by pouring molten cast iron with a high content of spheroidal graphite. No cracks occurred in the pipe. The final composition of this cast iron is C
:3.4%, Si:4.3%, Mn:04%, Mo:0
．． It was 9%.

Reference Example 1: A pipe 82 with the same manufacturing method and dimensions as Example 1,
The shape of the metal part 81 is the shape obtained by removing the sleeve part 14 from the metal part 11 of Example 1 (FIG. 8), and it is placed in a mold, and molten spheroidal graphite cast iron equivalent to FCD45 at 1400° C. is poured into it. It was cast.

The pipe 82 was broken at the boundary 86 and divided into a part cast into the metal part 81 and a part made only of ceramics. No cracks were found in the part cast into the metal part 81.

Reference example 2: R on the side where the pipe 82 of the metal part 81 of reference example 1 is exposed.
The manufacturing method and dimensions were as shown in Example 1 in a mold formed into a metal part shape (Fig. 9) with a rounded part 8 of =20.
A pipe 92 identical to the above was installed, and molten spheroidal graphite steel equivalent to FCD45 at 1404°C was poured into it.

The pipe 92 was broken at the boundary 96 and divided into a part cast into the metal part 91 and a part made only of ceramics. No cracks were found in the part cast into the metal part 91. Cracks occurred in several thin-walled portions of the rounded portion 8, which was made of cast iron.

(Effects of the invention) Since the pipe is cast without using a cushion layer, the connection between the pipe and the casting is strong. Therefore, the gripping force is not lost even when used at high temperatures, so it can be used at high temperatures, for example, as a hot water supply pipe for molten aluminum.

Since the stress level is small, the pipe will not easily break even if stress is applied in four perpendicular directions to the axis of the pipe.

[Brief explanation of the drawing]

Figures 1 and 7 show a partial cross section 1 of a partially cast ceramic pipe according to the present invention! l (front view),
FIG. 2 is a plan view thereof. FIG. 3, FIG. 4, and FIG. 5 are diagrams showing the shape of the slit. FIG. 6 is a partial sectional view (front view) showing the entire outer periphery of the ceramic pipe. FIGS. 8 and 9 are partial cross-sectional views (front views) of a pipe surrounded by a metal part without a sleeve part. 11.71.81.91--metal part, 12.62.72.82.92--1-ceramic pipe, 13.73--1 circular ring part, 14, 74--111 sleeve part, 15.75---Slit, 16.86.96- Boundary part, 7- Spheroidal graphite cast iron pipe, 8- Earl 1 originator
Kitagawa Iron Works Co., Ltd. Figure 3 Figure 4 Figure 5

Claims (1)

[Scope of Claims] 1) A cast ceramic pipe consisting of a ceramic pipe and a cast metal part provided in a part of the ceramic pipe, wherein the cast metal part is connected to the annular part and the sleeve. A partially cast ceramic pipe, which is formed from a sleeve part and has a slit in the sleeve part, the other end of which is open. 2) The partially cast ceramic according to claim 1, wherein the ceramic pipe is exposed on both sides of the cast metal part, and sleeve parts are formed on both sides of the cast metal part. made pipe. 3) The partially cast ceramic pipe according to claim 1, wherein the cast metal part is cast iron or cast steel.