JPS59152029A - Method of repairing defected casting - Google Patents

Abstract

PURPOSE:To carry out good repair by attaching a refractory body as a backup to the part to be repaired in a casting and redissolving the part from the other side and removing the defect. CONSTITUTION:A refractory body 2 is deposited on the other side of the surface to be repaired on which a casting defect exists in a casting, by means of spraying or padding, making it a backup. An arc, plasma, or an electron beam is generated through a generator 3 and the defected part in casting is locally redissolved from the other side of the refractory body 2 side. The detect 5 is floated up and removed within a molten pool 5. After the molten pool 5 is cooled and hardened, the refractory body 2 is removed with a hammer, etc. As for a refractory body, a castable refractory material, a plastic refractory material, or a spraying refractory material is used.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for repairing casting defects in a cast product, and particularly to the method described above, which can be applied without any restriction to the shape of the casting defect and is easy to operate.

The present inventors previously proposed a repair method in which casting defects in a cast product are locally remelted by heat input such as arc, plasma, or electron beam, and the casting defects are floated and removed.

However, in the case of a through defect, if there is no backup, there is a risk that locally remelted metal will flow out. Furthermore, even in the case of internal defects, if it is difficult to control the amount of heat input to obtain the required remelting depth, locally remelted metal may flow out if there is no backup.

One solution to this situation is to back up the metal plate, but this back-up method would cause the metal plate and the locally melted base metal to adhere to each other, so after the repair is completed, it must be removed and molded. Particularly in the case of cast products with complex shapes, shaping after removal requires a large number of man-hours.

The present invention is capable of repairing without using a metal plate as a backup when applying a repair method in which casting defects in a cast product are locally remelted by heat input such as arc, plasma, or electron beam and removed in powder form. This was done for the purpose of reducing the number of man-hours required for later removal and shaping of the metal plate.

That is, the present invention is a repair method in which a casting defect in a cast product is locally remelted by heat input such as an arc or plasma, and the casting defect is floated and removed, which is characterized by spraying or injecting a refractory material as a backup. The present invention relates to a method for repairing casting defects, and has the following advantages.

(1) Penetrating defects can be repaired satisfactorily.

(2) There is no need to control the amount of heat input when repairing internal defects.

(3) After the repair is completed, the refractory used for backup can be easily removed with a hammer, etc., so the number of man-hours required for its removal and shaping is greatly reduced compared to when a metal plate is used. .

Examples of refractories used in the present invention include those commercially available as castable refractories, plastic refractories, sprayed refractories, etc. Examples of castable refractories include Al403 64%-8iO) 50% high alumina ktzOs82%-8 as an example of quality, plastic refractory material
Examples of i02 13% 80% alumina and spray-resistant materials include A/40399 CX high alumina.

FIGS. 1(A) to 1(E) are diagrams showing one embodiment of the method of the present invention along its steps.

The method of the present invention will be explained below with reference to FIGS. 1(A) to 1(K).

The casting defect 1 of the cast product shown in FIG. 1(A) was detected by arcing.

When the casting defect 1 is repaired by flotation removal by locally remelting by heat input from plasma or electron beam, etc., the 11th
As shown in (B), back up the refractory material 2 by spraying or embedding it on the surface opposite to the repaired surface (by hitting the refractory material with a mallet or the like to make it adhere).

Next, as shown in FIG. 1 (CD), an arc, plasma or electron beam 4 is generated by an arc, plasma or electron beam generator 3 or the like to locally remelt one part of the casting defect and form a molten pool 5. to float away casting defects. The state in which the melt pool 5 is cooled and solidified is shown in Figure 1 (D
).

As shown in Fig. 1 (D), the refractory material 2 used for backup is removed with a hammer or the like. As a result, what is shown in FIG. 1(g)) is obtained.

If necessary, smooth the backed up surface using a grinder, etc.

The method of the present invention described in detail above provides the following effects.

(],) Through-hole defects can be repaired well.

(2) When repairing internal defects, even if the remelted metal reaches the opposite side of the heat input surface, the back-up can prevent the remelted metal from flowing out, so it is possible to prevent the remelted metal from flowing out when repairing internal defects. There is no need to control the amount of heat, making repair operations easier.

(3) The number of man-hours required for removing and molding the backup after the repair is completed is greatly reduced.

[Brief explanation of drawings]

FIGS. 1(A) to 1(E) are diagrams showing one embodiment of the method of the present invention along its steps. Sub-agents 1) Meifuku agent Ryo Hagiwara - 143

Claims (1)

[Claims] In a method of repairing a casting defect in a cast product, a refractory is used as a backup for the repaired part, and the repaired part of the casting is locally remelted from the opposite side of the refractory mounting surface to float and remove the casting defect. A casting defect repair method characterized by: