JP2005246570A - Method for repairing wear resistive portion - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for repairing a wear resistive portion wherein a repairing portion is surely and effectively repaired when the defects, such as wear, cracks, etc., of the wear resistive portion are to be repaired. <P>SOLUTION: The method for repairing the wear resistive portion comprises: a first process for forming a cut portion 3a on the repairing portion 3 by carrying out a machining operation when repairing the repairing portion 3 of the wear resistive portion 2 coated on a base material portion 1; a second process for mounting a repairing tip 5 by injecting a repairing material 4 after cutting the repairing portion 3 by carrying out the machining operation; and a third process for forming the repairing portion 3 by means of a heating means 6 after mounting the repairing tip 5 on the repairing material 4. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for repairing a wear-resistant portion that can reliably and stably perform brazing repair when performing brazing repair on wear and defects of a wear-resistant portion.

  For example, an electric valve used in a thermal power plant or a nuclear power plant connects a handle 104 and a motor 105 with a valve rod 103 interposed in a valve body 102 accommodated in a valve casing 101 as shown in FIG. Then, the valve rod 103 is advanced and retracted along the valve sliding portion 106 by the driving force of the handle 104 or the motor 105, so that the valve body 102 can be operated so as to be able to contact and separate from the valve seat 107.

  In addition, the motor-operated valve is welded by welding using a wear-resistant member on the valve seat 107, and the valve seat 107 is subjected to build-up construction or thermal spray coating of the wear-resistant member to close the valve, The valve body 102 is brought into watertight contact with the valve seat 107 to enhance the sealing effect.

  Thus, even if the valve seat 107 is subjected to build-up construction or thermal spray coating using a wear-resistant member in order to enhance the sealing effect, the motor-operated valve is worn out on construction parts such as build-up as a result of many years of use. Or a defect such as a crack may occur for some reason.

  When wear or cracking occurs in the build-up construction part, conventionally, repair work is performed on the defective part using the same material as the original wear-resistant member, and the watertightness of the valve body 102 and the valve seat 107 is maintained again. I was letting.

  However, wear, cracks, etc. occur in construction parts such as build-up, and even if repairs are made to the defective parts, they cannot be maintained for a long time, and cracks, etc. may occur again. This crack or the like is considered to be caused by residual stress remaining on the boundary surface with the non-melted portion because a partially melted portion is generated in the original base material at the time of initial overlaying.

  Also, when repairing the build-up construction part, if the entire surface is repaired, the residual stress does not remain locally, but once the build-up construction part is removed by machining, the build-up construction must be performed again. There was a lot of waste, such as spending a great deal of labor in a limited work space.

  Many repair methods that improve such problems have been proposed.

  For example, Japanese Patent Application Laid-Open No. 11-123617 (Patent Document 1) discloses a repair means for heating and infiltrating a brazing material against cracks in a construction part such as overlay. This technique is a method of heating in the atmosphere and brazing using a flux to prevent oxidation.

  Further, in Japanese Patent Laid-Open No. 2002-46028 (Patent Document 2), in the case of brazing repair as described above, after the brazing repair, a wear-resistant member layer is formed on the repaired portion, and the wear-resistant member is built up. A method of providing is disclosed. This method is a method that satisfies both repair such as cracking and overlay repair.

  Japanese Patent Laying-Open No. 2003-1402 (Patent Document 3) discloses a method of brazing while maintaining a repaired portion in an inert atmosphere. This method uses a container that locally creates an inert atmosphere to maintain the inert atmosphere.

As described above, many repair methods that skillfully utilize the convenience of brazing have been proposed.
JP-A-11-123617 JP 2002-46028 A Japanese Patent Laid-Open No. 2003-1402

  Conventionally, when performing brazing repairs, if the brazing surface is not horizontal, the molten brazing material will not sufficiently accumulate in the places where brazing is required and will often flow down, but these points are described above. This publication does not mention anything.

  That is, when the brazing melts, it spreads over the surface of the object to be heated and may not flow properly into the repaired part. In particular, when the surface of the object to be heated is inclined, the brazing material tends to flow down in the direction of gravity and does not accumulate in the repaired portion. When the brazing material flows down, the repair portion is not satisfactorily filled.

  In the case of a shortage of brazing filler metal, the addition of brazing filler metal can be considered, but the yield of brazing filler metal deteriorates, leading to an increase in cost. In addition, if the brazing material is added due to the lack of brazing material, the brazing material is excessively stacked on the brazed portion, and it is difficult to guarantee the strength.

  For brazed parts, it is known that the thinner the brazing material layer, the higher the degree of strength guarantee. Therefore, there is a need for an improved measure to further reduce the thickness of the brazing material layer and prevent the molten material from flowing down. It was done.

  The present invention has been made based on such circumstances, and when a repair part is constructed for defects such as wear and cracks, the wear-resistant part capable of reliably and effectively repairing the repair part. The purpose is to provide repair methods.

  In order to achieve the above-mentioned object, the repair method of the wear-resistant part according to the present invention, as described in claim 1, when performing repair work on the repaired part of the wear-resistant part attached to the base material part, A first step of cutting the repair portion by machining, a second step of injecting a repair material after machining the repair portion, and mounting a repair tip; and a repair tip for the repair material After the mounting, the method includes a third step of forming the repaired portion using a heating means.

  Moreover, in order to achieve the above-mentioned object, the repair method for a wear-resistant part according to the present invention performs repair work on the repaired part of the wear-resistant part attached to the base part as described in claim 2. At this time, a first step of cutting the repair portion by machining, and a second step of attaching the repair tip to the repair material in advance after cutting the repair portion by machining and repairing the repair portion. And a third step of forming the repair portion using a heating means after mounting the repair material and the repair tip on the repair portion.

  In addition, in order to achieve the above-described object, the repair method for a wear-resistant part according to the present invention includes, as described in claim 3, the repair material containing either Fe, Cо, or Ni as a main component. , Cr, Al, and Ti, and a brazing material containing any one of the melting point lowering elements among B, Si, and C.

  Further, in order to achieve the above-mentioned object, the repairing method for a wear-resistant part according to the present invention is such that the repairing tip is composed of one of Fe, Co, and Ni as a main component. And hardening with one kind of hard precipitate of carbide, boride and silicide.

  Further, in order to achieve the above-described object, the repair method for a wear-resistant part according to the present invention uses a high-frequency heating device as a heating means and forms a spacer as described in claim 5. In this method, the repairing tip is heated by interposing.

  Moreover, the repair method of the abrasion-resistant part which concerns on this invention is the method in which the spacer forms the electrical insulation layer as described in Claim 6, in order to achieve the above-mentioned objective.

  Moreover, the repair method of the abrasion-resistant part which concerns on this invention is the method in which the chip | tip for repair forms the electrical insulation layer, as described in Claim 7, in order to achieve the above-mentioned objective.

  The method for repairing a wear-resistant part according to the present invention includes a first step in which a defect or the like occurs as a result of long-term use in the wear-resistant part, and when repairing is performed, machining is performed to cut and repair the repaired part, After the shaving construction, it is provided with a second step of injecting a molten repair material into the repair portion, and further mounting a repair tip, and a third step of forming the repair portion using heating means after the second step. After repair, the occurrence of defects and the like can be further delayed to maintain high quality for a long time.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a method for repairing a wear-resistant part according to the present invention will be described with reference to the drawings and reference numerals attached to the drawings.

  FIG. 1 is a process procedure diagram showing an embodiment of a method for repairing a wear-resistant part according to the present invention.

  In FIG. 1, (a) is a view showing that the wear-resistant part 2 attached to the base material part 1 has a repaired part 3 such as wear or cracks, and (b) is a repaired part 3. It is a figure which shows the 1st process which performs construction of the shaving 3a, (c) inject | pours the repair material 4 which melt | dissolves into the repair part 3 after the shaving construction of the repair part 3, and also mounts | wears with the chip | tip 5 for repair. (D) is a figure which shows the 3rd process which shape | molds the repair part 3 using the heating means 6 after a 2nd process, (e) is a figure in a 3rd process. It is a figure which shows the final repair part after the shaping | molding process of the repair part.

  In the repair method of the wear-resistant part according to the present embodiment, when a repair part 3 such as a defect is generated in the wear-resistant part 2 attached to the base part 1, the shaving 3a is applied to the repair part 3 of the wear-resistant part 2. After the first step (ST1) and the first step (ST1), the repair material 4 to be melted, specifically the brazing material, is injected into the portion of the cutting work, and the repair tip 5 is further passed through the repair material 4. And a second step (ST2) for fixing to the repair portion 3 and a third step (ST3) for forming the repair portion 3 using the heating means 6 after the second step (ST2). ing.

  In the method for repairing a wear-resistant part according to the present embodiment including each of such processes, the first process (ST1) for cutting the repaired portion 3 shown in FIG. 1B is performed using a grinder, a drill, or the like. Sharpening is performed. For example, as shown in FIG. 4A, the cutting portion 7 having a shape in which a part of the repair portion 3 indicated by the broken line of the wear-resistant portion 2 is matched to the shape of a repair tip (not shown) is formed by a grinder or the like. . In this case, the remaining repair portion 3 is filled with the brazing material contained in the repair material used when the repair tip is fixed.

  Further, as shown in FIG. 4 (b), all the repaired portions may be deleted by cutting larger than the repaired portion 3, and a repair tip may be fixed thereto, or a part of the upper portion of the cutting portion 7 may be fixed. While fixing the repair tip, the remaining air may be filled with a brazing material included in the repair material.

  Furthermore, as shown in FIG. 4C, the repaired portion 3 may be covered with a cover 8 or the like without performing a shaving process to prevent oxidation.

  Moreover, the grindstone part 10 of the cutting tool 9 which forms the cutting part 7 in the repaired part 3 has a wedge-like shape, an inverted trapezoidal shape, a hemispherical shape, a flat plate-like defect, etc., as shown in FIGS. It is selected according to the shape.

  And the cutting part 7 of the repair part 3 constructed | assembled using the cutting tool 9 of such a shape is shown to FIG. 2 (a)-(f) other than the above-mentioned FIG. 4 (a)-(c). It is cut into a shape that matches the repair tip shape.

  When the first process is finished, in the second process (ST2), first, the melted repair material 4 is injected into the repaired portion 3 subjected to the shaving process. The repair material 4 is a brazing material rich in heat resistance and corrosion resistance, a material mainly composed of gold and platinum, or a brazing material mainly composed of Fe, Cо and Ni, and a corrosion resistant material such as Cr, Al and Ti, and A material containing an element that lowers the melting point such as B, Si, or C is used.

  The repair material 4 contains an alloy powder when a brazing material is used. By adding the alloy powder, it is easy to build up the concave portion. At that time, the mixing ratio is such that the ratio of the alloy powder is 65% or less.

  Thus, when the cutting part 7 is formed in the repaired part 3 and the repair material 4 to be melted is poured into the formed cutting part 7, the second step (ST2) mounts the repairing chip 5. As the repairing tip 5, a chip having high wear resistance, for example, containing Fe, Cо, Ni, etc. as a main component and hardened with a hard precipitate such as carbide, boride, silicide is used.

  Note that when the repairing chip 5 is mounted on the semi-molten repairing material 4, it may be brought into close contact by using, for example, an adhesive force such as a binder.

  Further, the repair material 4 and the repair tip 5 are preliminarily attached to each other as shown in FIGS. 5A to 5G, and the repair material 4 and the repair tip 5 that have been preliminarily attached. May be attached to the cutting portion 7 of the repair portion 3.

  When the repairing material 4 is interposed in the repaired part 3 and the repairing chip 5 is mounted, the third step (ST3) is molded using the heating means 6.

  In this third step (ST3), as shown in FIG. 6 (a), a spacer 11 is attached to a repairing chip 5 having a repairing material 4 interposed in a repairing part 3, and a heating means 6, for example, a high-frequency wave is mounted thereon. Heat using a heating device. The spacer 11 is used, as shown in FIG. 6 (b), if the repair tip 5 is pressed by the spacer 11 coated with an electrical insulating layer, the contact between the repair tip 5 and the heating means 6 is prevented. This is based on the fact that an excessive amount of the repair material 4 is extruded and maintained at an appropriate amount, and the adhesion of the repair tip 5 to the repair portion 3 is further increased.

  In addition, as shown in FIG. 6C, the repair chip 5 needs to be coated with an electrical insulating layer 12 in a portion that does not come into contact with the repair material 4 when the spacer 11 is not used.

  When the repair material 4 is interposed in the repair portion 3 and the repair tip 5 is heated, the repair tip 5 and the like are maintained in an inert gas atmosphere to prevent oxidation.

  As described above, in the present embodiment, after a defect such as a crack formed in the wear-resistant portion 2 is cut by machining, a repair material 4 such as a molten brazing material is injected into the cut portion. Since the repairing chip 5 is mounted and heated by the heating means 6 after the repairing chip 5 is mounted, the occurrence of defects and the like can be further delayed after the repair to maintain high quality for a longer time. .

It is a process procedure showing an embodiment of a method for repairing a wear-resistant part according to the present invention, (a) is a diagram showing that the wear-resistant part attached to the base material part has been repaired parts such as wear or cracks, (B) is a diagram showing a first process for performing repair work on the repaired part, (c) is a process for attaching a repair material to be melted on the repaired part and then mounting a repairing chip after the repaired part is shaved. The figure which shows 2 processes, (d) is a figure which shows the 3rd process which shape | molds a repair part using a heating means after a 2nd process, (e) is the last after the shaping | molding process of the repair part in a 3rd process. The figure which shows a repair part. (A)-(f) is a figure which shows the shape of the cutting part of a repair part in the 1st process shown in FIG. (A)-(f) is a figure which shows the shape of the grindstone part of the cutting tool used when forming a cutting part in a repair part in the 1st process shown in FIG. (A)-(c) is a figure which shows the shape of the cutting part of a repair part in the 1st process shown in FIG. (A)-(g) is a cutting part of a repaired portion of the repair material and the repair tip that are attached to the repair material in advance in the second step shown in FIG. The figure which shows the state before mounting | wearing. (A)-(c) is a figure which shows shape | molding using a heating means in a repair part in the 3rd process shown in FIG. The figure explaining the repair method of the conventional wear-resistant part which took the motor operated valve as an example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base part 2 Wear-resistant part 3 Repair part 3a Sharpening 4 Repair material 5 Repair tip 6 Heating means 7 Cutting part 8 Cover 9 Cutting tool 10 Grinding stone part 11 Spacer 12 Electrical insulating layer 101 Valve casing 102 Valve body 103 Valve rod 104 Handle 105 Motor 106 Valve sliding part 107 Valve seat

Claims (7)

When repair work is performed on the repaired part of the wear-resistant part attached to the base material part, the first step of cutting the repaired part by machining, and after repairing the machined part by machining, the repair material is injected And a second step of mounting the repair tip, and a third step of forming the repair portion using heating means after the repair tip is mounted on the repair material. Repair method. When performing repair work on the repaired part of the wear-resistant part attached to the base material part, the first step of cutting the repaired part by machining, and machining the repaired part to scrape, and then to the repair material in advance A second step of attaching the repair chip to the repair portion, and a third step of molding the repair portion using heating means after the repair material and the repair tip are attached to the repair portion. A method for repairing a wear-resistant part, comprising: The repair material contains any one of Fe, Cо, and Ni as a main component, and contains any corrosion-resistant component among Cr, Al, and Ti and any melting point lowering element among B, Si, and C. The method for repairing a wear-resistant part according to claim 1 or 2, wherein a brazing material is used. The repair tip is composed of one of Fe, Co and Ni as a main component and hardened with one kind of hard precipitate of carbide, boride and silicide. 2. A method for repairing a wear-resistant part according to 2. 3. The method for repairing a wear-resistant part according to claim 1, wherein the repair portion is molded by using a high-frequency heating device as a heating means and heating the repair tip with a spacer interposed therebetween. The method for repairing a wear-resistant part according to claim 4, wherein the spacer forms an electrically insulating layer. 3. The method for repairing a wear-resistant portion according to claim 1, wherein the repairing tip forms an electrical insulating layer.

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