JPH0871753A - Welding and fixing method for ceramic pieces and ceramic piece - Google Patents

Abstract

(57) [Abstract] [Purpose] When a ceramic piece is lined, the metal part is prevented from being exposed, the wear and the life of molten aluminum are improved, the base material is protected from corrosive gas and liquid, and sufficient bonding strength is provided. obtain. [Structure] A screw hole penetrating the ceramic piece is provided, and a stud welding pin having a threaded portion is screwed into the hole, the ceramic piece and the stud welding pin are integrated, and the stud welding pin is welded. A method of welding and fixing a ceramic piece characterized by fixing a ceramic piece. Further, a stud welding pin provided with a threaded portion is provided with a constricted part in the middle of the threaded portion, and the stud welding pin is provided after the stud welding. A method of welding and fixing a ceramic piece, characterized in that the ceramic piece is cut in the middle of a screw hole, and a ceramic screw is screwed into the void to fill the void.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of attaching a ceramic piece to the surface of a metal base material by arc stud welding, and a ceramic piece to be used for the method.

[0002]

2. Description of the Related Art By providing a heat resistant protective layer of ceramics on a metal base material, a structural material used in a high temperature atmosphere such as a furnace wall, a burner, and tuyere is obtained. Alternatively, it is used as a lining for high-speed rotating equipment such as blowers and pumps by utilizing the wear resistance of ceramics.

Recently, as a method for easily forming the ceramic layer on site, there has been proposed a method of attaching ceramics formed into a piece of a fixed shape by means such as welding or brazing.

For example, in Japanese Laid-Open Patent Publication No. 62-2248, as a welding ceramic piece, a flange portion following a cone portion is provided, and a pin portion of a stud in which a pin is integrally molded or metal-bonded to the flange portion is used as a ceramic. A structure is proposed in which the piece is inserted into a hole provided in the body.

In this structure, however, the pins are exposed on the surface of the ceramic piece. Therefore, when the pin is used as the lining of a molten aluminum container, the pin is melted and aluminum penetrates through the holes of the ceramic piece, This caused the cone portion to melt and the ceramic piece to separate from the base material.

Further, the metal portion exposed on the surface of the ceramic piece has a higher wear rate than that of the ceramic piece and shortens the life of the ceramic piece.

[0007]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In a conventional ceramic piece, a pin that has been torn off after welding is exposed on the surface of the ceramic piece. Aluminum penetrated from the part, the cone part was melted and the ceramic piece was peeled from the base material.

In the conventional method of welding and fixing a ceramic piece shown in FIG. 7, the pin and the metal plate are exposed in a large area on the surface of the ceramic piece, the metal portion is worn away and the ceramic piece cannot be held, and the life of the wear resistant lining material is increased. Was short.

In the conventional method of welding and fixing a ceramic piece shown in FIG. 7, since a stepped portion is formed in the hole through which the stud welding pin of the ceramic piece is inserted, stress concentration occurs and the portion is liable to crack and the strength is insufficient. .

In the conventional method of welding and fixing a ceramic piece shown in FIG. 7, the pin and the metal plate are brazed, so that the pin and the metal plate are separated and the ceramic piece is separated from the base material in an environment at a temperature higher than the brazing temperature. I couldn't use it.

In the conventional method of welding and fixing a ceramic piece shown in FIG. 7, the pins and the metal plate are brazed, so that it is necessary to raise the temperature to the brazing temperature, which requires a long manufacturing process, requires much fuel and labor, and is expensive. There was a problem.

The present invention is to provide a method for welding and fixing a ceramic piece and a ceramic piece which solve the above five points.

[0013]

According to a first aspect of the present invention, a ceramic piece and a stud welding pin are integrated by screwing a stud welding pin having a threaded portion penetrating the ceramic piece and having a threaded portion in the hole. Is a method of welding and fixing a ceramic piece by welding the stud welding pin to fix the ceramic piece, and the second is to provide a constricted part in the middle of the threaded part of the stud welding pin provided with the threaded part, After stud welding, the stud welding pin is cut in the middle of the screw hole of the ceramic piece, and a ceramic screw is screwed into the void to fill the void. In addition, the stud welding pin has a threaded portion in the first half, the latter half has a straight portion thinner than the diameter of the screw bottom, and a constricted portion is provided at the boundary between the screw portion and the straight portion. Cutting, and screwing a ceramic screw into the void, including a method of welding and fixing the ceramic piece that fills the void and prevents the metal part from being exposed, and further provides a screw hole that penetrates the ceramic piece,
A stud welding pin shorter than the thickness of the ceramic piece is screwed into the screw hole, the ceramic piece and the stud welding pin are integrated, and the stud welding gun is directly pressed against the stud welding pin to form the stud welding pin. Is welded to fix the ceramic piece, and then a ceramic screw is screwed into the void portion to fill the void portion and prevent the metal portion from being exposed. Further, a ceramic piece provided with at least one screw hole is engaged with the screw hole, and a stud welding pin thinner than the thickness of the ceramic piece or a stud welding pin having a constricted portion at a position thinner than the thickness of the ceramic piece. It is in.

[0014]

[Function] Providing a threaded hole through the ceramic piece,
A method for welding and fixing a ceramic piece in which a ceramic piece and a stud welding pin are integrated by screwing in a stud welding pin having a threaded portion in the hole, and the stud welding pin is welded to fix the ceramic piece. Since the screw of the stud welding pin is screwed into the screw hole provided in the ceramic piece, the ceramic piece and the stud welding pin can be firmly fixed so that there is no looseness. Moreover, the bonding strength is high. Also, since it is fixed with screws, it is resistant to heat cycles.

A second feature is that the unnecessary portion of the pin is folded by providing the cross-sectional area reduction portion provided on the pin inside the surface of the ceramic piece in order to facilitate the unnecessary removal of the pin after welding. It is possible to prevent wear of the wear-resistant material and heat-resistant material in the voids after the removal, covering the metal part and permeating aluminum, and preventing the cone part from being melted and the ceramic piece from peeling off from the base material. In addition, this coating abrasion resistance effect is synergized to obtain an excellent effect.

A stud welding pin provided with a threaded portion is provided with a constricted portion in the middle of the threaded portion, and after the stud welding, the stud welding pin is cut in the middle of the screw hole of the ceramic piece to form a ceramic in the void. The above effect can be more remarkably exhibited because it is the method of welding and fixing the ceramic piece in which the void is filled by screwing the screw.

In particular, a wear-resistant material or a heat-resistant material is filled in the void portion after the unnecessary portion of the pin is broken off to cover the metal portion to improve the wear resistance, the ceramic piece is prevented from peeling from the base material, and the ceramic is The same wear resistance as the piece can be secured.

[0018]

EXAMPLE As shown in FIG. 1, the embodiment of the present invention is such that the ceramic piece 1 and the stud welding pin 2 are integrally engaged with each other via the screw portion 3 for engaging the stud welding pin 2 with the ceramic piece 1. There is. A welding stat 4 is provided at the tip of the stud welding pin 2.

FIG. 6 shows the stud welding pin 2 of FIG.
A welding projection 5 is provided directly on the tip of the.

Further, FIG. 2 shows a pin 2 for stud welding provided with a constricted portion 6, and FIG. 3 shows that the pin 2 for stud welding shown in FIG. It is a combination of 7 together. FIG. 3 shows a state of being welded to the base material.

4 and 5 show a threaded portion 3 provided only at the tip of the stud welding pin 2 and the welding stat 4 is fixed to the ceramic piece 1. In FIG. 4, electricity is supplied from the stud welding pin 2. FIG. 5 shows a method of welding by directly energizing from a short stud welding pin 2 having no constricted portion 6 in FIG. Here, 8 is a stud welding machine.

The ceramic piece 1 having a thickness of 3 to 50 mm was processed into a square or rectangular shape. Also,
There are various materials such as zirconia, silicon carbide, and silicon nitride. A threaded portion 3 is provided at the center of the ceramic piece 1, and various stud welding pins 2 are integrally engaged with the threaded portion 3 to apply an electric current. Welded.

Welding conditions Current value 1000 to 20000 A, 4000 to 6000
A is optimum voltage 100-300V, 150-180V is optimum Energization time 0.5 seconds

The stud welding pin and the metal base material are in close contact with each other,
No rattling occurred on the ceramic piece.

[0025]

The following effects can be achieved by using the present invention. Since the metal part is not exposed, wear and long life for molten aluminum are extended. The base material can be protected from corrosive gas and liquid. Sufficient bonding strength can be obtained. It is possible to eliminate the gap between the base material and the ceramic piece. Since the ceramics piece and the blind plug are screwed together, the airtightness is high and molten aluminum does not easily enter. The gap between the ceramic piece and the base material after welding can be adjusted by setting the screw length of the stud welding pin and the ceramic piece. That is, the gap between the ceramic piece and the base material can be made zero, and a gap for laying a cushioning material can be secured.

[Brief description of drawings]

FIG. 1 is a sectional view in which a stud welding pin is screwed into a ceramic piece.

FIG. 2 is a sectional view in which a pin for stud welding is provided with a constricted portion and screwed into a ceramic piece.

FIG. 3 is a cross-sectional view in which a constricted portion of a stud welding pin is broken off and a blind plug of ceramics is screwed in.

[Fig. 4] A stud welding pin in which a screw portion is provided in the front half of the stud welding pin, a straight portion having a diameter smaller than that of the front half is provided in the rear half, and a constricted portion is provided at the boundary between the front half and the rear half. Sectional view screwed into a ceramic piece.

FIG. 5 is a schematic diagram when a stud welding pin having a threaded portion on a shaft shorter than the thickness of the ceramic piece is screwed into the ceramic piece and welded to the base material.

FIG. 6 is a cross-sectional view in which a stud welding pin in which a flange portion is not provided at the tip of the stud welding pin and a stud welding projection is directly provided is screwed into ceramics.

FIG. 7 is a piece for stud welding of a conventional type ceramics.

[Explanation of symbols]

 1 Ceramics Piece 2 Stud Welding Pin 3 Screw Part 4 Welding Stat 5 Welding Protrusion 6 Constricted Part 7 Blind Plug 8 Base Material 9 Stud Welding Gun 10 Metal Plate 11 Gap a 12 Brazing 13 Constricted part a 14 Stud Pin

Claims (5)

[Claims] 1. A ceramic piece is provided with a threaded hole, and a stud welding pin having a threaded portion is screwed into the hole to integrate the ceramic piece and the stud welding pin, and the stud welding pin is welded. Welding and fixing method for ceramic pieces, which is characterized by fixing the ceramic pieces. 2. A stud welding pin provided with a threaded portion is provided with a constricted portion in the middle of the threaded portion, and after the stud welding, the stud welding pin is cut in the middle of the screw hole of the ceramic piece to form a ceramic in the void portion. Welding and fixing method for ceramic pieces, which is characterized by filling the voids by screwing in the screws. 3. A stud welding pin is provided with a threaded portion in a front half thereof, and a rear portion thereof is provided with a straight portion having a diameter smaller than a diameter of a screw bottom, and a constricted portion is provided at a boundary between the screw portion and the straight portion. A method for welding and fixing ceramic pieces, characterized in that the latter half is cut and the ceramic screws are screwed into the voids to fill the voids and prevent the metal parts from being exposed. 4. A ceramic piece is provided with a threaded hole, and a stud welding pin shorter than the thickness of the ceramic piece is screwed into the threaded hole so that the ceramic piece and the stud welding pin are integrated with each other for stud welding. After directly pressing the stud welding gun to the pin and welding the stud welding pin to fix the ceramic piece,
A method of welding and fixing a ceramic piece, characterized in that a ceramic screw is screwed into the void to fill the void and prevent the metal part from being exposed. 5. A ceramic piece provided with at least one screw hole, which is engaged with the screw hole, and has a stud welding pin thinner than the thickness of the ceramic piece or a stud welding pin having a constricted portion at a position thinner than the thickness of the ceramic piece. Made ceramic pieces.