JP2003311442A - Repairing apparatus of metallic material and its repairing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an easily controllable repairing apparatus of a metallic material by which influence on a base material caused by heat input is reduced, so that the deformation of the base material is prevented, and the occurrence of defects in a repair part is prevented when a metallic material is repaired, and to provide a repairing method thereof. <P>SOLUTION: The repairing apparatus 10 of a metallic material consists of a rotary tool 1 which is press-contacted with a thermal spraying layer 5 formed by thermal spraying on a defective part 4 in the surface of a metallic material, so that the thermal spraying layer 5 is rubbed, thus is heated and plastically fluidized, and a driving apparatus 2 which rotatively drives the rotary tool 1. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal material repair method, and more particularly to a metal material repair apparatus and repair method used for gas turbines, steam turbines, turbines, and power generation equipment such as nuclear power generation.

[0002]

2. Description of the Related Art Metallic materials are usually used for members used in gas turbines, steam turbines, etc., members used in water turbines, and members used in nuclear power plants. When these metal materials are continuously used, there is a case where cracking or corrosion causes wall thinning, and some repairing methods have been conventionally performed as repairing methods for such cracking or wall thinning.

For example, repair methods such as welding overlay by TIG welding and MIG welding, plasma overlay (PTA) for supplying a powder overlay material into plasma, and laser overlay using a laser are generally used. It is used.

[0004]

The conventional repairing method as described above has an advantage that a large amount of heat is required to heat the repairing material to a temperature equal to or higher than the melting point, and the construction time required for the repairing is short.

However, since the repair is performed at a high temperature, the heat input to the base material is large, and the deformation amount due to the heat load of the base material is large.

Further, in the conventional welding overlay method and the plasma overlay overlay repair method, fine control of the process is not easy, and the quality of the process may vary depending on the process control. It was also a cause of construction failure such as remaining.

Further, since such process control depends on the experience and intuition of an engineer, the reproducibility of the work is low and the accuracy of the repair work is problematic.

On the other hand, in the conventional method of repairing a metal material, there is a problem of poor bonding at the bonding surface between the base material and the repair material. In order to improve the bondability, the conventional method of repairing a metal material requires a step of polishing or cleaning the defective portion of the base material.

However, in this polishing / cleaning step, since impurities on the surface of the defective portion are mechanically polished, heat input to the base material is large, causing deformation of the base material, and cleaning using chemicals. However, it was difficult to sufficiently remove impurities at the repaired part because there were alterations of the base material and restrictions on construction.

In order to solve such a problem, a repairing method has been developed in which a powder of the overlay material is placed on the surface of the repaired portion and a rotary tool is pressed against the surface of the equipment to perform overlaying by frictional heat. ing.

As a method of repairing such a metal material, there is one described in, for example, Japanese Patent Application Laid-Open No. 11-50266, and when a part of a metal member is modified, a powder modifying material is applied to a target portion. A technique is disclosed in which the modifying material is replenished, the rotating probe is embedded in the replenishing portion, and the modifying material is integrated by rotating friction.

However, when powder is used as the overlay material, preprocessing such as groove processing for carrying the powder material is required, and it is difficult to replenish the defective portion with the powder, and repair is required at the time of repair. There was an inconvenience such as insufficient filling of the material, resulting in defects in the repaired portion.

Further, a technique for effectively reducing the amount of heat input to the base material to prevent the deformation of the base material, but for solving the problem of heat input and improving the repair accuracy has been proposed. However, it was not submitted.

That is, there has been a demand for a repairing apparatus and repairing method for a metal material which suppresses the heat input to the base material, has a simple construction process, and has few defects in the repairing portion.

The present invention has been made in consideration of the above circumstances, and when repairing a metal material, the influence of heat input on the base material is reduced to prevent the base material from being deformed. An object of the present invention is to provide a repairing apparatus and a repairing method for a metal material, which prevent the occurrence of defects in the repairing section and are easy to control.

[0016]

In order to solve the above-mentioned problems, a repairing device for a metallic material according to the present invention has the following features:
As described in 1., a rotary tool that is pressed against a thermal spray layer formed on a defective portion of the surface of a metal material, and is heated by friction of the thermal spray layer to cause plastic flow, and a drive device that rotationally drives the rotary tool. It is composed of and.

Further, the metal material repairing method according to the present invention is characterized in that, as described in claim 2, the end surface of the rotary tool on the side in pressure contact with the sprayed layer is formed in a convex shape. is there.

Further, according to the third aspect of the present invention, in the metal material repairing device, the rotary tool is fitted into the sprayed layer at the end surface of the rotary tool which is in pressure contact with the sprayed layer to cause plastic flow. Is provided, and a screw portion is formed on the outer surface of the protrusion.

Further, the repairing device for a metal material according to the present invention is characterized in that, as described in claim 4, a spiral spiral groove is provided on the end face of the rotary tool on the side in pressure contact with the sprayed layer. To do.

Further, according to a fifth aspect of the present invention, there is provided a metal material repairing device which comprises a heating device for heating the sprayed layer from the outside when the rotary tool frictionally heats the sprayed layer. It is characterized by being provided.

On the other hand, the method for repairing a metallic material according to the present invention is, as described in claim 6, a method for repairing a metallic material for repairing a defective portion on the surface of a base material made of a metallic material. And a step of forming a sprayed layer by thermal spraying, heating the sprayed layer by friction by pressing a rotating tool against the sprayed layer to plastically flow the sprayed layer. .

Further, according to the method of repairing a metal material according to the present invention, as described in claim 7, when a flame spraying method using a combustion gas is used to form a sprayed layer on a defective portion of the surface of the base material, Spray particle velocity 500m / s ~ 1200m /
The method is characterized by setting s.

Further, in the method for repairing a metal material according to the present invention, as described in claim 8, when the flame sprayed layer is formed on the defective portion on the surface of the base material by the flame spraying method using compressed air, Spray particle velocity 500m / s ~ 1200m /
The method is characterized by setting s.

On the other hand, in the method for repairing a metallic material according to the present invention, as described in claim 9, boron or silicon is added as a thermal spraying material in the thermal spraying step of forming a thermal sprayed layer on the defective portion on the surface of the base material. The method is characterized by using the above-mentioned thermal spray material.

Further, in the method for repairing a metal material according to the present invention, as described in claim 10, in the step of heating the plastic layer by pressing the rotary tool against the spray layer and rubbing the spray layer to heat the plastic layer. The method is characterized in that the base material and the sprayed layer are externally heated by a heating means.

Further, in the method for repairing a metallic material according to the present invention, as described in claim 11, the impurity layer on the surface of the defective portion of the base material is removed, and the surface of the defective portion of the base material is sprayed. A sprayed layer is formed by a method, and a rotary tool is pressed against the sprayed layer to rub the sprayed layer to plastically flow the sprayed layer.

Further, in the method for repairing a metal material according to the present invention, as described in claim 12, the impurity layer on the surface of the defective portion of the substrate is turned by a lathe, a milling machine, a polishing machine, a router, a polishing paper, or a blasting machine. Among them, the method is characterized by removing by a mechanical removal method using at least one of them.

Further, in the method for repairing a metallic material according to the present invention, as described in claim 13, the impurity layer on the surface of the defective portion of the base material is selected from CO ₂ laser, YAG laser and excimer laser. The method is characterized by removing by a laser removal method using at least one type of laser described above.

Further, in the method for repairing a metallic material according to the present invention, as described in claim 14, the impurity layer on the surface of the defective portion of the substrate is hydrochloric acid, phosphoric acid, acetic acid, citric acid, sodium hydroxide. It is a method characterized by removing by a chemical removal method using an aqueous solution containing at least one of the above.

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION A metal material repairing apparatus and method according to the present invention will be described below with reference to the drawings.

FIG. 1 shows a metal material repairing apparatus 10 which is a first embodiment of a metal material repairing apparatus according to the present invention.
The repair device 10 is a rotary tool 1 composed of a cylindrical or cylindrical metal member, and a drive device 2 connected to one end of the rotary tool 1 for rotating the rotary tool 1 with the central axis of the cylinder as a rotary axis. Composed of and. The rotary tool 1 is held vertically to a base material 3 made of a metal material that is a repair target member.

FIG. 2 shows a metal material repairing method using the metal material repairing apparatus 10. This metal material repair method 20
Is composed of a thermal spraying process 21 and a friction heating process 22. The thermal spraying step 21 is a step of forming the thermal sprayed layer 5 on the defective portion 4 on the surface of the base material 3 made of a metal material by a thermal spraying method. The friction heating step 22 is a step of rubbing the thermal spray layer 5 with the rotary tool 1, heating and causing plastic flow to crush the oxide film and the impurity layer, and bring the thermal spray layer 5 and the base material 3 into close contact with each other. is there.

Next, with reference to FIGS. 1 and 2, the repairing method 20 by the repairing apparatus 10 for the metallic material will be described in more detail.

First, in the thermal spraying step 21, the thermal sprayed layer 5 is formed on the defective portion 4 on the surface of the base material 3 made of a metal material by thermal spraying.
Are formed (FIG. 1A).

On the surface of the defective portion 4, there is an impurity layer such as an oxide film formed by exposing to the outside air before the sprayed layer is applied. In conventional metal material repair equipment,
Before the thermal spraying process, the thermal spraying was performed through the process of removing the impurity layer such as the oxide film.
In the case of 0, the defect portion 4 is not subjected to the impurity layer removing step.
Direct thermal spraying on.

Next, in the friction heating step 22, the rotary tool 1 is vertically pressed against the thermal spray layer 5 from the state where the thermal spray layer 5 is applied to the defective portion 4 with an appropriate pressing force. When the rotary tool 1 contacts the thermal spray layer 5, the thermal spray layer 5 is heated and fluidized by the rotational friction of the rotary tool 1, and the thermal spray layer 5
When the stress against the pressure exceeds a certain stress value, the plastic flow indicated by the arrow occurs in the sprayed layer 5 (FIG. 1 (B)).

Due to the effect of this plastic flow, the impurity layer such as an oxide film formed on the surface of the defective portion 4 of the base material 3 is crushed, and the new metal surface of the base material 3 is exposed. Therefore, the base material 3
Since the surface of and the thermal sprayed layer 5 adhere well, a strong thermal sprayed coating is formed.

The friction heating step 22 may be performed immediately after thermal spraying, or may be performed after cooling the base material 3.

In the method 20 for repairing a metal material, since bubbles are appropriately present in the sprayed layer 5 to enhance the fluidity of the sprayed layer, it is possible to plastically flow with a small heat input amount. The internal ratio of bubbles is 5 to 25% in terms of area ratio.
Is preferred. Here, the intrinsic rate is defined as the area ratio of bubbles to the tissue area when the cross-sectional structure of the sprayed layer is observed. When the bubble inclusion rate is 5% or less, a large amount of heat input is required to plastically flow the sprayed layer, and when the bubble inclusion rate is 25% or more, bubbles may remain in the repaired portion after friction heating. .

Further, the embodiment in which the contact angle between the rotary tool 1 and the base material 3 is vertical has been exemplified, but a configuration other than a vertical angle may be adopted depending on the working conditions such as the shape of the equipment to be repaired and the installation position. Good.

Examples of the thermal spraying process 21 include, for example, atmospheric plasma spraying, reduced pressure plasma spraying, high speed flame spraying,
Cold spraying, arc spraying, and gas spraying methods can be applied.

It is known that the properties of the sprayed layer 5 formed in this spraying step 21 are affected by the velocity of the sprayed particles. That is, in the flame spraying method, setting the threshold value of the velocity of the sprayed particles is effective for improving the repair accuracy in the repair method for the metal material.

Therefore, FIG. 3 shows the result of investigation on the optimum value of the particle velocity in the flame spraying method.

FIG. 3 shows the relationship between the sprayed particle velocity in the spraying method and the defect rate of the repaired part after friction heating of the sprayed part. In FIG. 3, ○ is a flame spraying method, Δ is a plasma spraying method, ×
Shows the data of the gas spraying method, respectively.

Here, the repaired portion defect rate indicates the area ratio of the area of the repaired defective portion to the entire area of the observed surface when the repaired portion of the test piece is observed.

As is clear from the results shown in FIG. 3, in the flame spraying method indicated by ◯, the defect rate of the repaired part tends to change due to the difference in the sprayed particle velocity, and as the sprayed particle velocity becomes lower, The defect rate of repaired parts increases. That is, the defect rate of the repaired portion is suppressed to about 4% at a particle velocity of 600 m / s or more, but at the particle velocity of 400 m / s, the repair defect rate shows an increasing tendency of 10%.

This is because when the sprayed particle velocity is low, the sprayed coating is peeled from the surface of the base material in the friction heating step with the rotary tool, and as a result, bubbles are generated in the repaired portion.

The same tendency is observed in other thermal spraying methods than the flame spraying method. For example, in the case of the plasma spraying method, the defect rate of the repaired portion is 12% at a sprayed particle velocity of 200 m / s.
In the case of the gas spraying method, the spray particle velocity is 200
If it is less than m / s, the defect rate of repaired parts exceeds 16%.

According to the present invention, in the flame spraying method using the combustion gas, the defect rate of repaired parts can be reduced to 5% or less by setting the spraying conditions such that the sprayed particle velocity is 500 m / s. . Therefore, the sprayed particle velocity lower limit value of the repairing method of the metal material is set to 500 m / s.

On the other hand, the upper limit of the sprayed particle velocity is about 1200 m / s, which is the upper limit of the sprayed particle velocity obtained by the current spraying technique, and the defect rate of the repaired portion is about 1% when the sprayed particle velocity is 1000 m / s or more. Therefore, 1200m /
s.

That is, in the metal material repairing method of the present invention, the spray particle velocity in the flame spraying method using combustion gas was set to 500 m / s to 1200 m / s.

Also, in the flame spraying method, even when compressed air is used, the defect rate of repaired parts can be reduced to 5% or less by setting the spraying conditions so that the sprayed particle velocity is 500 m / s. . Therefore, the lower limit value of the sprayed particle velocity in the method for repairing a metal material is set to 500 m / s.

As for the upper limit value of the sprayed particle velocity, the upper limit of the sprayed particle velocity by the current spraying technique is about 1200 m / s, and the defect rate of the repaired portion is about 1% when the sprayed particle velocity is 1000 m / s or more. Therefore, 1200m /
s.

Therefore, in the method of repairing a metal material, the spray particle velocity in the flame spraying method using compressed air was set to 500 m / s to 1200 m / s.

Next, the result of investigation on the relationship between the temperature change and the amount of deformation due to heat input to the base material will be described with reference to FIG. FIG. 4 shows the relationship between the temperature change of the base material due to heat input during the repair work and the deformation amount of the base material. Here, the deformation amount is an index indicating the ratio of deformation of the base material from the original state before and after the repair work of the metal material.

As shown in FIG. 4, the deformation amount of the substrate is 1% or less until the substrate temperature is about 400 ° C.
Although a gradual increase in the amount of deformation is recognized as the temperature rises, when the temperature is higher than this, the amount of deformation remarkably increases especially after 600 ° C. As is clear from this,
Suppressing heat input when repairing metallic materials is important as a repair technique.

According to the metal material repairing method 20 of the present invention, the heat input to the base material 3 is the heat input by thermal spraying and the rotary tool 1
Since it is only due to the frictional heat of No. 2, there is no heat input due to the impurity removing work of the defective portion 4. Therefore, the amount of heat input is smaller than that in the conventional metal material repairing method, and the temperature rise of the base material 3 can be minimized. Therefore, the deformation of the base material 3 due to the heat load is satisfactorily prevented.

On the other hand, in the conventional method of repairing a metal material, since the removal step of polishing the impurity layer such as the oxide film on the surface of the base material 3 is performed, the heat input to the base material 3 is large, and The deformation of the material 3 due to the heat load was large.

As the repair material used in the metal material repairing method 20, a material having a low melting point and easy plastic flow is preferable in order to reduce the heat input during friction heating. On the other hand, considering the mechanical characteristics of the repaired portion and the compatibility with the base material, a material having a composition similar to that of the base metal is desirable. As a material satisfying these conditions, a material obtained by adding boron or silicon to a metal material having the same composition as the base material to lower the melting point can be cited.

In the conventional metal material repair method, when boron or silicon is added to the repair material for use, a heat treatment step for melting the repair material and diffusing boron or silicon into the base material is indispensable. It was Therefore, a large amount of heat was required for the repair.

In the method 20 for repairing a metallic material, boron or silicon is diffused into the base material by local heating by the rotary tool by utilizing plastic flow due to frictional heating of the rotary tool. Therefore, the heat input to the base material is significantly suppressed as compared with the conventional metal material repairing method, and it is possible to repair the defective portion while preventing the base material from being deformed.

As described above, according to the metal material repairing method 20, the impurity layer such as the oxide film existing at the interface between the sprayed layer and the substrate is effectively crushed by the plastic flow induced by the frictional heating of the rotary tool. Therefore, the step of removing the impurity layer is not required.

Further, even when a material to which boron or silicon is added is used as the repair material, since boron or silicon is diffused by frictional heating due to the rotation of the rotary tool, it can be applied to the base material as compared with the conventional metal material repair method. The heat input is very low.

Further, the metal material repairing device 10 has a simple structure and can control the repairing work by controlling the rotary tool, so that the process control of the repairing work is easy. Therefore, the reproducibility is better than that of the conventional metal material repairing device, and the repair accuracy can be improved.

Next, a second embodiment of the repair device of the present invention will be described.

The metal material repairing apparatus 50 of the second embodiment shown in FIG. 5 has a convex portion 52 having a convex shape formed on the contact surface of the rotary tool 51 with the thermal spray layer 5.

The rotating tool 51 can exert a strong stress on the thermal spray layer 5 by the action of the convex portion 52 which is a contact portion with the thermal spray layer 5. Therefore, since the plastic flow inducing effect due to the rotation is high with respect to the sprayed layer 5, it is applied especially when a hard sprayed material is used.

Next, a third embodiment of the metal material repairing method will be described with reference to FIG. The metal material repairing apparatus 60 shown in FIG. 6 (A) is provided with a protrusion 62 on the contact surface of the rotary tool 61 with the thermal spray layer 5, and the outer surface of the protrusion 62 is as shown in FIG. 6 (B). The screw portion 63 is provided.

Since the rotary tool 61 has the projection 62 at the tip, it exerts a strong stress on the thermal spray layer 5 during repair. At this time, since the protrusion 62 fits into the thermal spray layer 5 and stirs, plastic flow is induced in the thermal spray layer 5 more effectively. Therefore, it is applied to repair using a sprayed material having a higher hardness, and further improves the crushing effect of the impurity layer due to the plastic flow in the sprayed layer 5.

Next, with reference to FIG. 7, a fourth embodiment of the metallic material repairing apparatus will be described. As shown in FIG. 7 (A), this metallic material repairing device 70 includes a rotary tool 71.
The spiral spiral groove 72 is provided on the contact surface with the sprayed part.

Further, as shown in FIG. 7B, a projection 73 may be provided at the tip of the rotary tool 71, and a spiral groove 72 may be provided in the projection 73.

When the contact surface of the rotary tool 1 is configured to be flat, depending on the type of repair material, depending on its material characteristics,
As shown in FIG. 7C, the thermal spray material escapes from the end of the rotary tool 1, and as a result, the repair material runs short during the repair work,
In some cases, defective parts such as bubbles were generated in the repaired part.

By providing the rotary tool with the spiral groove 72 on the contact surface of the rotary tool like the repairing device 70 for metallic material, the rotation center axis of the rotary tool 71 is rotated from the outer circumference of the rotary tool 71 by the rotation of the rotary tool 71. A plastic flow of the material occurs as indicated by an arrow in the direction of (Fig. 7 (D)). By the action of this plastic flow, the repair material is effectively replenished in the repair portion 4, so that the filling rate of the repair material in the defective portion 4 is improved,
Prevents the occurrence of repair defects.

In FIG. 8, the defect rate of the repaired portion (indicated by A in the figure) in the case of using the metallic material repairing device 40 using the rotary tool provided with the spiral groove 72 and the flatness without the spiral groove 42 are shown. The graph which compared with the repair part defect rate (indicated by B in the drawing) of the repairing device for the metal material using the rotary tool of the surface is shown. Here, the repaired portion defect rate indicates the area ratio of the repaired defective portion to the entire area of the observation surface of the test piece.

As is clear from the results shown in FIG. 8, the defect ratio of the repaired portion in the repairing device for the metal material having the rotary tool of the flat surface of B is about 5.5%, while the spiral groove of A is The defect ratio of the repaired portion in the sprayed layer by the rotary tool 71 provided with is significantly improved to 2%. That is, it has been found that the accuracy of the repair work is further effectively improved by providing the spiral groove 72 on the contact surface of the rotary tool 71 with the thermal spraying portion 4.

Therefore, by providing the spiral groove 72 in the rotary tool, the defective portion 4 can be filled with the repair material favorably, the defect rate of the repaired portion is significantly reduced, and the repair performance of the repair apparatus for metal materials is improved. Further improve.

The spiral groove 72 is formed by grinding a spiral groove on the flat surface of the tip of the rotary tool 71. Spiral groove 72
The shape of is, for example, a semicircular cross-sectional shape as shown in FIG. 9A, a V-notch type (triangular type) cross-sectional shape as shown in FIG. 9B, or a quadrangle as shown in FIG. 9C. It can have a cross-sectional shape. The depth of the spiral groove 72 may be determined in accordance with material characteristics such as hardness of the material to be sprayed and parameters such as the outer diameter and the rotation speed of the rotary tool 1, and is sufficient for supplementing the repair material with the repair material. Optimal depth is selected.

Next, a fifth embodiment of the metallic material repairing apparatus will be described with reference to FIG. The metal material repairing device 80 is configured to repair the lack of heat input to the base material 3 by using the heating device 81 when the rotating tool 1 is pressed against the sprayed layer 5 to perform repairing more efficiently. Is.

When a material having a high melting point is used as the repair material, the heat input by the rotary friction of the rotary tool 1 alone causes
The amount of heat input may be insufficient for inducing plastic flow in the sprayed layer 5. In such a case, by providing a heating device 81 like the metal material repairing device 80, frictional heat is compensated for, and a sufficient amount of heat is applied to the base material 3 to induce plastic flow in the sprayed layer 5. Supply heat and repair efficiently.

As the heating device 81, it is possible to use a heating medium such as an infrared irradiation device, a heating wire, a combustion gas flame, a plasma flame or the like.

Next, a modified example of the metal material repairing method according to the present invention will be described.

In the metal material repairing method 20, impurities and oxide films crushed by plastic flow are scattered in the sprayed layer. Generally, the impurities do not cause any particular problem even if they are scattered in the sprayed layer. However, when inconvenience due to the crushed oxide film or impurities is expected, as in the method 90 for repairing a metal material shown in FIG. 11, the base material is used as a pre-step of the thermal spraying step 21 in the method 20 for repairing a metal material. It is also possible to add a removing step 91 for removing the impurity layer in the material defect portion.

The metal material repairing method 90 of FIG. 11 is obtained by adding a defect removal step 91 of the metal material to the preceding step of the metal material repairing method 20. Examples of the defective portion removing step 91 include a mechanical removing method using a router, a lathe, a milling machine, abrasive paper, blasting, or the like.
According to the mechanical removal method, it is possible to remove the impurities reliably, and there is an advantage that the time required to remove the impurity layer is short.

The defective portion removing step 91 may be performed by a laser removing method. Examples of laser removal methods include:
It is possible to use a CO ₂ laser, a YAG laser, an excimer laser, or the like. Particularly, the YAG laser and the excimer laser are suitable from the viewpoint of power density and oscillation frequency.

Further, the defective portion removing step 91 may be a chemical removing method using a chemical. Examples of chemicals used in the chemical removal method include acids such as hydrochloric acid, phosphoric acid, acetic acid, citric acid and sodium hydroxide, or alkaline solutions. In the chemical removal method, depending on the combination of the material of the base material and the solution, it is possible to apply a voltage between the base material and the solution to dissolve the impurity layer.

According to this metal material repairing method 90, since the removal step 91 of removing the oxide film or the impurity layer is provided in advance, it is possible to prevent impurities from being mixed in the sprayed layer.

The metal material repairing apparatus and the repairing method of the present invention can be applied regardless of the size of the repairing device or the repaired portion. It is especially suitable for repairing relatively large equipment such as energy equipment. For example, it can be applied to the repair of turbine runners and buckets, needle tips, rotor blades and stator blades of gas turbines or combustor liners, transition pieces, rotor blades and stator blades or rotors of the above turbines, and valves. is there.

[0088]

As described above, according to the repairing apparatus and repairing method for a metallic material of the present invention, the defective portion of the base material made of the metallic material is repaired by the thermal spraying method, and the rotary tool is pressed against the thermal sprayed layer, Impurities and oxide films are crushed by the plastic flow induced by the rotary drive of the rotary tool, and the base material and the sprayed layer are brought into close contact with each other. Therefore, the heat input to the base material is only the heat input by the thermal spraying and the heat input by the frictional heat due to the rotational driving of the rotary tool. It is possible to repair the material.

[Brief description of drawings]

1A and 1B are explanatory views showing a first embodiment of a metal material repairing apparatus according to the present invention.

FIG. 2 is a flowchart showing a method for repairing a metallic material according to the present invention.

FIG. 3 is a graph showing a relationship between a sprayed particle velocity and a repaired portion defect rate in the spraying method.

FIG. 4 is a graph showing the relationship between substrate temperature and substrate deformation amount.

FIG. 5 is an explanatory diagram showing a second embodiment of a repairing device for metallic materials according to the present invention.

6A and 6B are explanatory views showing a third embodiment of the metal material repairing apparatus according to the present invention.

7 (A) and 7 (B) are explanatory views showing a fourth embodiment of a metal material repairing apparatus according to the present invention, and FIGS. 7 (C) and (D) are flat surface tools and spiral grooves. Schematic diagram for explaining the plastic flow of each repair material when using the tool.

FIG. 8 is a graph comparing the defect ratios of repaired parts of repaired parts when a rotary tool having a spiral groove and a rotary tool having a flat surface are used.

9 (A), (B) and (C) are views showing a construction example of a cross-sectional shape of a spiral groove.

FIG. 10 is an explanatory view showing a fifth embodiment of a metal material repairing apparatus according to the present invention.

FIG. 11 is a flowchart showing a modified example of the metal material repairing method according to the present invention.

[Explanation of symbols]

1 ... Rotary tool, 2 ... Drive device, 3 ... Substrate, 4 ... Defective part,
5 ... Sprayed layer, 10 ... Repairing device for metal material, 20 ... Repairing method for metal material, 21 ... Spraying process, 22 ... Friction heating process,
51 ... Rotating tool, 52 ... Convex portion, 60 ... Repairing device for metal material, 61 ... Rotating tool, 62 ... Projection portion, 63 ... Screw portion, 7
0 ... Metal material repair device, 71 ... Rotating tool, 72 ... Helical groove, 73 ... Projection portion, 80 ... Metal material repair device, 81
... Heating device, 90 ... Metal material repairing method, 91 ... Impurity removing step.

Continued front page    (72) Inventor Masayuki Ishikawa             2-4 Suehiro-cho, Tsurumi-ku, Yokohama-shi, Kanagawa               Toshiba Keihin Office (72) Inventor Toshiaki Fuse             2-4 Suehiro-cho, Tsurumi-ku, Yokohama-shi, Kanagawa               Toshiba Keihin Office F-term (reference) 4E067 DA04 DA05 DA06

Claims (14)

[Claims] 1. A rotary tool, which is brought into pressure contact with a sprayed layer formed on a defective portion of a surface of a metal material and frictionally heats the sprayed layer to heat and plastically flow the rotary tool, and a drive device for rotationally driving the rotary tool. A repairing device for metallic materials, which is characterized by being composed of 2. The repairing apparatus for a metal material according to claim 1, wherein an end surface of the rotary tool on the side in pressure contact with the sprayed layer has a convex shape. 3. A protrusion for fitting into the sprayed layer to cause plastic flow is provided on an end surface of the rotary tool on a side that comes into pressure contact with the sprayed layer, and a screw portion is formed on an outer surface of the protrusion. The repair apparatus for a metal material according to claim 1, which is characterized in that. 4. The repairing device for a metal material according to claim 1, wherein a spiral spiral groove is provided on an end surface of the rotary tool on a side that comes into pressure contact with the sprayed layer. 5. The metal material repairing device according to claim 1, further comprising a heating device for heating the sprayed layer from the outside when the sprayed layer is frictionally heated by the rotating tool. 6. A method of repairing a defective material on a surface of a base material made of a metallic material, comprising: a step of forming a sprayed layer on the surface of the defective portion by spraying; and a rotary tool being pressed against the sprayed layer. And heat it by rubbing the sprayed layer,
And a step of plastically flowing the sprayed layer. 7. The sprayed particle velocity is set to 500 m / s to 1200 m / s when a sprayed layer is formed on the defective portion on the surface of the base material by a flame spraying method using a combustion gas. 6. The method for repairing a metal material according to item 6. 8. The sprayed particle velocity is set to 500 m / s to 1200 m / s when a sprayed layer is formed on the defective portion on the surface of the base material by a flame spraying method using compressed air. 6. The method for repairing a metal material according to item 6. 9. The repair of a metallic material according to claim 6, wherein a thermal spraying material containing boron or silicon is used as the thermal spraying material in the thermal spraying step of forming a thermal spraying layer on the defective portion on the surface of the base material. Method. 10. In the step of bringing a rotary tool into pressure contact with the sprayed layer to heat the sprayed layer by friction to heat the sprayed layer for plastic flow, the base material and the sprayed layer are externally heated by a heating means. The method for repairing a metal material according to claim 6. 11. The sprayed layer is formed by removing the impurity layer on the surface of the defective portion of the base material, forming a sprayed layer on the surface of the defective portion of the base material by a spraying method, and bringing a rotary tool into pressure contact with the sprayed layer. The method for repairing a metal material according to claim 6, wherein the thermal sprayed layer is plastically fluidized by rubbing the metal. 12. The mechanical removal method using at least one of a lathe, a milling machine, a polishing machine, a router, a polishing paper, and a blast to remove the impurity layer on the surface of the defective portion of the base material. The method for repairing a metallic material according to claim 11, 13. An impurity layer on the surface of the defective portion of the base material is removed by a laser removal method using at least one kind of laser selected from a CO ₂ laser, a YAG laser, and an excimer laser. The method for repairing a metallic material according to claim 11, 14. The impurity layer on the surface of the defective portion of the substrate is removed by a chemical removal method using an aqueous solution containing at least one of hydrochloric acid, phosphoric acid, acetic acid, citric acid and sodium hydroxide. The method for repairing a metal material according to claim 11, which is characterized in that.