CN106424722A - Metal product manufacturing method - Google Patents

Abstract

The present invention relates to a method of manufacturing metal articles. The object of the present invention is to easily manufacture a metal product composed of a metal base material and a surface coating material regardless of the complexity of the shape. In the metal product manufacturing method of the present invention, with respect to the metal product, the cross-section of each layer in the stacking direction is prepared based on three-dimensional CAD data including the respective three-dimensional position information of the metal base material as the main body and the surface coating material covering the surface After the drawing data, based on the cross-sectional drawing data for each layer, the metal base material powder 6 and the surface coating material powder 7 are placed on the modeling table, and solidified by laser melting and sintering.

Description

Metal Products Manufacturing Method

technical field

The present invention relates to a method of manufacturing a metal product composed of a metal substrate and a surface coating material (hereinafter also referred to as "surface coating").

Background technique

Conventionally, when producing metal products, a surface coating layer was sometimes applied to the surface of a molded body using a metal base material. Hereinafter, as a metal product, a centrifugal pump that sucks and discharges liquid fluid (hereinafter simply referred to as "fluid") using an impeller will be described as an example.

Centrifugal pumps are often required to have corrosion resistance, wear resistance, etc. depending on the application. For example, when the fluid contains salt or chemical substances (sea water, industrial water, etc.), corrosion resistance is required for the centrifugal pump. If the corrosion resistance is low, for example, chemical corrosion (erosion) sometimes occurs on the surface of the impeller.

In addition, when the fluid contains solid matter such as mud and sand (river water, etc.), abrasion resistance is required for the centrifugal pump. If the wear resistance is low, for example, wear by solid matter such as mud and sand (slurry erosion) may occur on the surface of the impeller.

Also, irrespective of the type of fluid, for example, cavitation may occur on the surface of the impeller. Cavitation is damage caused by the impact force when cavitation (bubbles) are locally generated in a part of the fluid where the pressure is lower than the saturated vapor pressure, and the cavitation is broken and eliminated.

For example, austenitic stainless steel, which has excellent corrosion resistance and is available at low cost, is often used for impellers of centrifugal pumps. Furthermore, as materials for improving corrosion resistance, duplex stainless steel, nickel-based alloys, and the like are also used. However, since it is difficult to improve both corrosion resistance and wear resistance only by the material of the impeller, in order to improve both, for example, the surface of a stainless steel impeller may be coated with a hard surface coating.

In addition, in the centrifugal pump, in addition to the surface of the impeller, there are also portions that are coated with a surface coating for the purpose of improving wear resistance and the like. For example, in a centrifugal pump, there is a seal portion that prevents fluid leakage between the rotating impeller, the rotating shaft, and the housing on the fixed side. In order to reduce fluid leakage as much as possible in this seal portion, the interval between the rotating side member and the fixed side member is designed to be small. Therefore, there is a possibility that the rotation-side member and the fixed-side member slide in the seal portion. If both the sliding rotary side member and the fixed side member have the same surface material, there is a possibility of seizure. In addition, for such a sliding part, due to the corrosiveness of the internal fluid, the condition of mud and sand, etc., the wear caused by sliding may further develop. The surface of one of the fixed side members is covered with a surface coating.

In connection with this, for example, in Patent Document 1, it is described in "Means for Solving the Problem" that "the present invention is characterized in that, as a covering member of a component requiring wear resistance, cavitation resistance, etc., The surface of the base material of the pump part made of stainless steel is coated with a Ni-Cr-Mo alloy containing at least one of Cr, Mo, Si, and B, and the balance consisting of Ni and unavoidable impurities, or, the remainder The first film of Co-Cr-Mo alloy composed of Co and unavoidable impurities, and Co containing Cr, Mo, Ni, Fe, Si, C, and the balance consisting of Co and unavoidable impurities. The second coating of a hard material composed of a base alloy." (Reference). That is, in this technique, wear resistance and cavitation resistance are improved by forming such a film on the surface of the impeller and the bushing.

In addition, for example, in Patent Document 2, claim 1 states "In a centrifugal pump having a pump housing and an impeller, and a sealing portion between the pump housing and the impeller inlet, the sealing portion in the sealing portion The opposing surface of the member on the impeller side and any one of the above-mentioned members on the pump housing side is surfacing welded to a predetermined thickness with a Ni alloy containing Cr and Mo that is softer than the material of the opposing surface by spraying or welding, so that it is consistent with The hardness difference between the facing surfaces is HB (Brinell hardness) = 50 or more, the member on the impeller side and the member on the pump housing side are made of duplex stainless steel made of the same material, and the member on which the Ni alloy is overlaid is determined by PREN value It is composed of duplex stainless steel with 40 or more, and the above-mentioned Ni alloy is a Ni alloy with Cr+Mo≥30%. That is, in this technique, corrosion resistance is improved by overlaying a highly corrosion-resistant Ni alloy on the impeller lip ring or casing seal ring corresponding to the impeller seal portion by spraying or welding.

In addition, especially for closed impellers (impellers with side plates), for example, in Patent Document 3, it is described in the "Abstract" that "hard coatings have a minimum low-pressure coating thickness and a minimum high-pressure coating thickness at their respective midpoints. Layer Thickness. The minimum low pressure coating thickness and the minimum high pressure coating thickness are in the range of about 0.085 to about 0.8 times either the maximum outlet coating thickness at the outlet distal end or the maximum inlet coating thickness at the inlet distal end, respectively. ". That is, in this technique, the thickness of the coating layer for corrosion resistance and the like is adjusted in consideration of the ease of coating (coating) construction according to the position of the blades of the hermetic impeller.

On the other hand, regarding the coating technology for impellers made of resin materials using 3D (Dimensions) printers and rapid prototyping three-dimensional layered modeling technology, for example, in Patent Document 4, it is described in claim 1 that "the manufacturing method of the impeller, It is characterized in that it has: a step of forming a non-metallic base material of a pre-designed shape by a rapid prototyping method, and a step of coating the surface of the base material with a surface metal layer". That is, in this technique, a metal layer is coated on the surface of a non-metallic resin impeller manufactured by a rapid prototyping method (three-dimensional lamination technique).

If a three-dimensional layered molding technique is used, even a product with a complex structure can be easily manufactured. Here, for example, the impeller in a centrifugal pump often has insufficient strength if it is made of a resin material because there is a load when the fluid is pressurized and a centrifugal force is applied by rotation. Therefore, for the impeller, it is desirable to use a three-dimensional layered modeling technology that can apply metallic materials.

Among the three-dimensional layered modeling techniques that can be applied to metal materials, there are powder supply method and powder sintered layering method. For example, the powder supply method described in Patent Document 4 is a method of performing molding while melting a powder material with a laser. In this powder supply method, since the molten material before solidification may deform due to its own weight, there is a limit to the shape that can be molded. On the other hand, as described in Patent Document 5, in the powder sintering lamination method, raw material powder is laid on each layer, and a predetermined portion is melted and sintered with a laser. In this powder sintering lamination method, since the part to be sintered by laser is supported by the powder located below it, there are few restrictions on the shapes that can be molded, and complex shapes can be molded.

prior art literature

patent documents

Patent Document 1: Japanese Patent No. 3886394

Patent Document 2: Japanese Patent No. 5096762

Patent Document 3: Japanese Patent Laid-Open No. 2014-1726

Patent Document 4: Japanese Patent Application Laid-Open No. 11-82377

Patent Document 5: Japanese Patent Laid-Open No. 2004-124200

Contents of the invention

The problem to be solved by the invention

However, even in the case of molding a metal product using the powder sintering lamination method, if a surface coating is required, a coating operation must be performed separately, and there is a problem that the operation is complicated. Furthermore, when the shape of the metal product is complex, not only the work of applying the surface coating is complicated, but also the work of applying the surface coating may be difficult or impossible due to constraints on the construction of spray plating and cladding welding.

For example, with a closed impeller, since side plates exist outside the blades, the space around the blade surface is narrow, making it difficult to work with a spraying machine or a welding machine. In addition, a thermal spraying machine and a welding machine that can be inserted into a narrow space may be used, but the surface coating material may not be sufficiently deposited depending on the direction of thermal spraying or welding. In addition, there is also a method of selectively performing arc spraying, flame spraying, and HVOF (High Velocity Oxygen Fuel) spraying on each part of the blade according to the difficulty and quality of construction. However, if the construction method is changed depending on the location, it is also considered that the reliability at the boundary of the construction location decreases while the construction cost increases.

Therefore, an object of the present invention is to easily manufacture a metal product composed of a metal base material and a surface coating material regardless of the complexity of the shape.

means to solve the problem

In order to solve the above-mentioned problems, the present invention is a metal product manufacturing method, which is a metal product manufacturing method for manufacturing a metal product composed of a metal base material and a surface coating material by a powder sintering lamination method using a metal base material powder and a surface coating material powder, It is characterized in that, after performing the step of creating cross-sectional view data for each layer in the stacking direction based on three-dimensional CAD (computer-aided design) data about the metal product, the following steps are repeated based on the cross-sectional view data for each layer: arranging the above-mentioned metal base powder on the position of the above-mentioned metal base material on the modeling table, and arranging the above-mentioned surface coating material powder at other positions; A step of melting and sintering the powder of the above-mentioned surface-coating material at the position of the above-mentioned surface-coating material to solidify.

Other means will be described later.

The effect of the invention

According to the present invention, a metal product composed of a metal base material and a surface coating material can be easily manufactured regardless of the complexity of the shape.

Description of drawings

FIG. 1 is a schematic diagram for explaining the powder sintering lamination method.

FIG. 2 is a flowchart showing a process flow of a metal product manufacturing method using the powder sintering lamination method in this embodiment.

Fig. 3 is a perspective view showing a structural example of a closed impeller.

Figure 4(a) is a side view of the closed impeller. (b) is the A-A sectional view of (a). (c) is the B-B arrow sectional view of (a).

Fig. 5(a) is a view showing a state in which metal base material powder and surface coating material powder are arranged on a molding table for manufacturing a hermetic impeller by the powder sintering lamination method. (b) is a figure which shows the state after performing laser sintering in the state of (a).

Fig. 6 is a sectional view showing a structural example of a horizontal axis multi-stage pump.

FIG. 7( a ) is an enlarged view of area C in FIG. 6 . (b) is an enlarged view of the region D of (a).

Fig. 8 is a cross-sectional view showing a structural example of a vertical shaft pump.

FIG. 9 is an enlarged view of area E of FIG. 8 .

Fig. 10 is a view showing a state in which metal base powder, surface coating material powder, and high melting point powder are arranged on a molding table for manufacturing a closed impeller by the powder sintering lamination method.

Explanation of reference signs

1 blade

2 core board

3 side panels

4 shaft holes

6 Metal base powder

6a Metal Substrates

7 Surface coating material powder

7a Surface coating materials

8 high melting point powder

10 horizontal axis multi-stage pump

11 housing

12 Suction port

13 axis of rotation

14 impeller

17 outlet

20a, 20b shaft seal device

21 bearings

31 Impeller mouth ring

32 Housing sealing ring

33 surface coating

41 Bearing housing

43 Bearing pads

44 bushing

45 bushing

46 surface coating

50 enclosed impeller

60 vertical shaft pump

101 modeling table

102 nozzles

103 Nozzles

104 laser device

105 Controls

detailed description

Embodiments of the present invention will be described below with reference to the drawings. First, the outline of a metal product manufacturing method using the powder sintering lamination method in this embodiment will be described with reference to FIGS. 1 and 2 . Here, a metal product composed of a metal base material and a surface coating material is produced by using a metal base material powder and a surface coating material powder by a powder sintering lamination method, which is one type of three-dimensional lamination modeling technology. Fig. 1 is a schematic diagram for explaining the powder sintering lamination method. As the main components, it includes a molding table 101, nozzles 102 and 103 for arranging powder, a laser device 104 for melting and sintering the powder, and a control device for controlling manufacturing. 105. In addition, FIG. 2 is a flow chart showing the processing flow of the metal product manufacturing method using the powder sintering lamination method in this embodiment.

First, the control device 105 inputs three-dimensional CAD (Computer Aided Design) data on metal products created in advance (step S1). When the metal product is, for example, an impeller, the three-dimensional CAD data includes respective three-dimensional positional information of the metal base material serving as the main body of the impeller and the surface coating material covering the surface.

Next, the control device 105 creates cross-sectional view data for each layer in the stacking direction based on the three-dimensional CAD data (step S2).

Next, the control device 105 repeats the processing of steps S4 to S6 for each layer (steps S3 to S7).

The control device 105 arranges the metal base material powder at the position of the metal base material by using the nozzle 102 in the amount of one layer on the build table 101 (hereinafter sometimes referred to as "build table" without a symbol) based on the cross-sectional view data, and the other The surface coating material powder is placed using the nozzle 103 (step S4).

Next, the control device 105 melts and sinters the metal base material powder at the position of the metal base material and the surface coating material powder at the position of the surface coating material by irradiating laser light from the laser device 104 based on the cross-sectional view data, thereby Curing (step S5). It should be noted that at this time, the surface-coating material powder located at a position other than the position of the surface-coating material remains in a powder state and is finally recovered.

Next, the control device 105 lowers the modeling table 101 by one stage (step S6).

In this way, by repeating the processing of steps S4 to S6 for each layer, using the metal base material powder and the surface coating material powder, the metal base material and the surface coating material powder can be easily manufactured by using the powder sintering lamination method regardless of the complexity of the shape. Metal products made of covered materials. Hereinafter, as metal products, a closed impeller, a casing seal ring, and a shaft sleeve are taken as examples to describe in detail.

Fig. 3 is a perspective view showing a structural example of a closed impeller. Among Fig. 4, (a) is the side view of the enclosed impeller of Fig. 3, (b) is the A-A arrow sectional view of (a), and (c) is the B-B arrow sectional view of (a).

As shown in FIGS. 3 and 4 , the hermetic impeller 50 includes five blades 1 , a core plate 2 integrated with a shaft hole 4 inserted into a central shaft, and a side plate 3 covering the outer peripheral side. It should be noted that an impeller having such a side plate is called a closed impeller, while an impeller without a side plate is called an open impeller.

In the closed impeller 50, the blade 1 has a complicated curved surface in order to improve fluid performance (high efficiency, wide operating range). Therefore, it is not easy to perform surface coating work using conventional spraying machines and welding machines. In addition, there is no side plate 3 in the A-A arrow sectional view of Fig. 4 (a) (Fig. 4 (b)), and there is a side plate 3 in the B-B arrow sectional view of Fig. 4 (a) (Fig. 4 (c)). 3. In addition, the shape of the curved surface of the blade 1 itself is also different in the A-A cross-sectional view ( FIG. 4( b )) and the B-B arrow cross-sectional view ( FIG. 4( c )). That is, the closed impeller 50 is not uniform in the vertical direction, so if it is manufactured by the powder supply method, the metal in the middle of the molding may be deformed by its own weight, so it is manufactured by the powder sintering lamination method in this embodiment.

FIG. 5( a ) is a view showing a state in which metal base powder and surface coating material powder are arranged on a molding table in order to manufacture a hermetic impeller 50 by the powder sintering lamination method. On the molding table, the metal base powder 6 is arranged at the position of the blade 1, the core plate 2, and the side plate 3 of the closed impeller 50 (see FIG. 4(c)), and the surface coating material powder is arranged at other positions. 7 (step S4 of FIG. 2). Then, by laser irradiation using the laser device 104 (FIG. 1), the metal base material powder 6 at the position of the blade 1, the core plate 2, and the side plate 3, and the surface coating material powder 7 at the position of the surface coating material Melting, sintering, and solidification (step S5 in FIG. 2 ). Thereby, as shown in FIG.5(b), the surface coating material 7a can be formed in the state coated on the surface of the metal base material 6a.

In this way, the metal base material and the surface coating material can be integrally molded to manufacture the hermetic impeller 50 . Furthermore, since the metal base material and the surface coating material can be integrally molded, there is an advantage that the joint strength between them is higher than welding or welding. In addition, generally, the thickness of the surface coating applied by welding and thermal spraying is about several hundred μm to several mm, but in the case of the powder sintering lamination method, the thickness of the surface coating can be freely changed, and further has The required corrosion resistance, wear resistance to distribute the advantages of coating thickness.

In addition, as the metal base material powder 6, powders of low-alloy steel, stainless steel, aluminum alloy, etc. are mentioned. In addition, examples of the surface coating material powder 7 include alloys such as nickel-based alloys, cobalt-based alloys, high corrosion-resistant stainless steel (duplex stainless steel), and tungsten carbide mixed with cobalt and/or nickel, chromium, etc. Adhesive products, etc. However, the materials shown here are examples and are not limited to these materials.

Next, referring to FIG. 6 and FIG. 7 , the state of manufacturing the case seal ring will be described. As shown in FIG. 6 , the horizontal axis multi-stage pump 10 has five-stage impellers 14 . In the horizontal axis multi-stage pump 10 , fluid is sucked in from the suction port 12 and the pressurized fluid is discharged from the discharge port 17 . Five-stage impellers 14 are attached to a rotating shaft 13 , and the rotating shaft 13 is supported by bearings 21 at both ends.

In order to minimize fluid leakage from the gap between the housing 11 and the rotating shaft 13 , shaft sealing devices 20 a and 20 b (seal portions) are attached to the rotating shaft 13 and the housing 11 , respectively. Since the shaft sealing devices 20a and 20b serve as sliding parts, either one is often coated with a hard surface coating.

Here, FIG. 7( a ) is an enlarged view of region C in FIG. 6 . In addition, FIG. 7( b ) is an enlarged view of a region D in FIG. 7( a ). At the inlet portion of the impeller 14 , an impeller mouth ring 31 and a casing seal ring 32 are attached to seal the suction side and the discharge side of the impeller 14 . In order to improve the sealing performance of the impeller ring 31 and the casing seal ring 32 , as shown in FIG. 7( b ), complex irregularities may be provided on the surfaces of either one or both of them. FIG. 7( b ) shows a structure in which complex unevenness is provided on both surfaces of the impeller ring 31 and the casing seal ring 32 .

For these impeller mouth rings 31 and casing seal rings 32, since the mud and sand involved in the working fluid slide while sliding, it is necessary to coat the sliding surface of the impeller mouth ring 31 or the sliding surface of the casing seal ring 32 with hard coating. quality surface coating. Here, a surface coating 33 is applied to the sliding surface of the case seal ring 32 .

In addition, although the illustration as in FIG. 5 is omitted, the casing seal ring 32 can be formed by using the metal base powder and the surface coating material by the powder sintering lamination method as in the case of the above-mentioned closed impeller 50. powder to manufacture. Specifically, since the case seal ring 32 is a cylindrical member, it is laminated in the axial direction by the powder sintering lamination method. Then, on the molding table, the metal base powder is arranged on the base part of the casing seal ring, the surface coating material powder is placed on a position other than it, and the metal base powder and the surface coating material in the vicinity are laser-coated. The powder is melted and sintered, so that the case seal ring 32 having unevenness can be easily produced together with the surface coating 33 .

Next, referring to FIG. 8 and FIG. 9 , the state of manufacturing the boss will be described. As shown in FIG. 8 , the vertical shaft pump 60 has a structure in which fluid is sucked in from the bottom of the figure, boosted by the impeller 14 , and discharged to the right from the top of the figure. A bearing 21 for supporting the rotating shaft 13 is disposed on the upper portion of the impeller 14 . FIG. 9 is an enlarged view of a region E including the bearing 21 .

As shown in FIG. 9 , with respect to the rotating shaft 13 , a sleeve 44 is fixed to the sliding portion by shrink fitting or the like. The surface of the sleeve 44 is covered with a hard surface coating 46 . On the other hand, the bearing 21 includes a bearing housing 41 , a boss 45 fixed to the bearing housing 41 , and a bearing pad 43 attached to the surface of the boss 45 . Since the bearing pad 43 and the surface coating 46 slide, resins such as PTFE (polytetrafluoroethylene) and PEEK (polyether ether ketone) or ceramic materials having good sliding properties are used for the bearing pad 43 . The bushing 44 is not abraded by the surface coating 46 on the surface even when mud and sand involved in the working fluid slides against the bearing pad 43 .

In addition, although the illustration as in FIG. 5 is omitted, the sleeve 44 can be formed by using the metal base powder and the surface coating material powder by the powder sintering lamination method similarly to the case of the above-mentioned closed impeller 50. manufacture. Specifically, since the sleeve 44 is a cylindrical member, it is laminated in the axial direction by the powder sintering lamination method. Then, on the molding table, the metal base powder is arranged on the bush base part, the surface coating material powder is placed outside it, and the metal base powder and the surface coating material powder near it are melted by laser. , sintering, so that the sleeve 44 can be easily manufactured together with the surface coating 46 .

Next, an embodiment in which the method of manufacturing the hermetic impeller 50 described in FIG. 5 is partially modified will be described. In the manufacturing method illustrated in FIG. 5 , a large amount of surface coating material powder 7 that has not been melted and sintered is recovered as a residual material, but generally, since the residual material contains impurities, if the separation of impurities is not performed, the Difficult to reuse. Furthermore, the surface coating material powder 7 is generally expensive, so the surface coating material powder 7 has a large amount of residual material, and if it is not reused without separating impurities, the production cost will increase. In addition, even if the separation treatment of impurities is performed, there is a problem that the cost is high.

Therefore, in order to improve this point, a method of using a high melting point powder having a melting point higher than that of the surface coating material powder in addition to the metal base material powder and the surface coating material powder will be described.

On the molding table, as shown in FIG. 10, the metal base powder 6 is arranged at the position of the blade 1, the core plate 2, and the side plate 3 of the closed impeller 50 (refer to FIG. 4(c)), and is arranged near them. The surface coating material powder 7 is provided with a high melting point powder 8 at a position other than that. Then, when the metal base material powder 6 and the surface coating material powder 7 are melted and sintered with a laser, the intensity of the laser is adjusted so that the high melting point powder 8 is not melted and sintered. The state after sintering is the same as in Fig. 5(b).

When two or more types of powders are used to form a shape by powder sintering lamination, if adjacent two types of powders are melted and sintered, the components of these powders will mix with each other. Although a material with high corrosion resistance and wear resistance is used for the surface coating material powder 7, if the components of the high melting point powder 8 are mixed therein, their functions will be reduced.

In the case of using two types of metal base powder 6 and surface coating material powder 7 shown in FIG. The surface layer of the surface coating material 7a is composed only of this component. That is, the corrosion resistance and wear resistance should only be maintained on the surface layer of the surface coating material 7a, so in the configuration of FIG. .

On the other hand, in the case of using the three types of powders shown in FIG. 10 , a boundary between the powders also occurs between the surface coating material powder 7 and the high melting point powder 8 . Therefore, it is necessary not to melt the high-melting-point powder 8 , and not to mix the components of the surface-coating material powder 7 and the high-melting-point powder 8 . However, when the surface coating material powder 7 is melted and sintered, sometimes the high melting point powder 8 adheres without melting. Therefore, the surface can be ground after the production of the enclosed impeller 50 using the powder sintering lamination method, and the high melting point powder 8 can be ground. The components of powder 8 were removed.

In addition, the high melting point powder 8 needs to have a melting point higher than that of the surface coating material powder 7, and it is desired to be low in price. Examples thereof include alumina, but are not limited thereto.

In addition, not only the closed impeller 50 but also the casing seal ring 32 and the bushing 44 can be manufactured using high melting point powders in addition to metal base powder and surface coating material powder.

Thus, according to this embodiment, metal products (closed impeller 50, casing seal ring 32, The bushing 44) can be easily manufactured regardless of the complexity of the shape.

In addition, manufacturing costs can be reduced by using high-melting-point powders in addition to the metal powder base material and the surface-coating material powder.

The above is the end of the description of the embodiment, but the aspects of the present invention are not limited to these. For example, the above-mentioned embodiment has been described in detail to explain the present invention in an easy-to-understand manner, but it is not limited to the embodiment that must include all the configurations described.

In addition, a part of the configuration of a certain embodiment may be replaced with a configuration of another embodiment, and the configuration of another embodiment may be added to the configuration of a certain embodiment.

In addition, specific configurations can be appropriately changed within a range not departing from the gist of the present invention.

Claims (3)

1. metallic article manufacture method, it is characterised in that be to use metal base powder and coated material powder to utilize powder End sintering stacking legal system makes the metallic article manufacture method of the metallic article being made up of metal base and coated material, with regard to Above-mentioned metallic article, is carrying out each of the coated material based on the metal base comprising to become main body and its surface of covering From three-dimensional CAD (the Computer Aided Design) data of three dimensional local information be made the section of every layer of stacked direction After the step of diagram data, following step is repeated to above-mentioned every layer based on above-mentioned profile data：

On banker, on the above-mentioned metal base powder of the position of above-mentioned metal base configuration, the position configuration beyond it State the step of coated material powder, and

By utilizing laser by the above-mentioned table of the metal base powder of above-mentioned configuration and the position being positioned at above-mentioned coated material Topcoating covers material powder fusing, sintering and the step that solidifies.

2. metallic article manufacture method, it is characterised in that be to use metal base powder, coated material powder and fusing point ratio The high high-melting-point powder of above-mentioned coated material powder utilizes powder sintered layered manner manufacture to be coated by metal base and surface The metallic article manufacture method of metallic article that material is constituted, with regard to above-mentioned metallic article, has carried out based on comprising to become main body Metal base and the three-dimensional CAD (Computer of respective three dimensional local information of coated material on its surface of covering Aided Design) after data are made the step of profile data of every layer of stacked direction, above-mentioned every layer is cutd open based on above-mentioned Face diagram data is repeated following step：

At the above-mentioned metal base powder of the position of above-mentioned metal base configuration on banker, in the position of above-mentioned coated material Put the above-mentioned coated material powder of configuration, the step of the above-mentioned high-melting-point powder of position configuration beyond them, and

By utilizing above-mentioned laser by the above-mentioned metal base powder of above-mentioned configuration and above-mentioned coated material powder smelting, burning The step tied and solidify.

3. metallic article manufacture method according to claim 1 and 2, it is characterised in that above-mentioned metallic article is for side The impeller of plate.