JP4736479B2 - Surface treatment method - Google Patents
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Description
本発明は、放電エネルギーを利用して、ワークの被処理部に対して表面処理を行うための表面処理方法に関する。 The present invention relates to a surface treatment method for performing surface treatment on a portion to be processed of a workpiece using discharge energy.
近年、ワークの被処理部に対する表面処理について様々な技術が開発されており、放電エネルギーを利用して、前記ワークの前記被処理部に対して表面処理を行う先行技術として特許文献１に示すものがある。 In recent years, various technologies have been developed for surface treatment of workpieces to be treated. Patent Document 1 discloses a prior art for performing surface treatment on the workpiece to be treated using discharge energy. There is.
即ち、金属の粉末とセラミックスの粉末との混合粉末からプレスによる圧縮によって成形した成形体により構成される電極を用い、油中において前記ワークの前記被処理部と前記電極の先端面との間にパルス状の放電を発生させることにより、その放電エネルギーによって前記ワークの前記被処理部に前記電極の材料或いは該材料の反応物質を堆積させて、前記ワークの前記被処理部に高硬度の薄膜を形成するものである。
ところで、前記電極中におけるセラミックスの含有率が高く、前記ワークの前記被処理部に前記薄膜に比べて厚肉の肉盛層を形成することができないものであるが、図５（ａ）に示すように、金属（合金を含む）を主成分とする粉末からプレスによる圧縮によって成形した成形体により構成される別の電極１０１を用いて、加工油等の加工液Ｌ中においてワーク１０３の被処理部１０５と電極１０１との間にパルス状の放電を発生させると、ワーク１０３の被処理部１０５に肉盛層１０７を形成することができる。 By the way, although the content rate of the ceramic in the said electrode is high, compared with the said thin film, the thick buildup layer cannot be formed in the said to-be-processed part of the said workpiece | work, but it shows to Fig.5 (a). As described above, the workpiece 103 is treated in the machining liquid L such as machining oil using another electrode 101 formed of a compact mainly formed of metal (including an alloy) by compression using a press. When a pulsed discharge is generated between the portion 105 and the electrode 101, the build-up layer 107 can be formed on the processing target portion 105 of the workpiece 103.
一方、図５（ｂ）に示すように、ワーク１０３の被処理部１０５の長さが電極１０１の幅に比べて長い場合又はワーク１０３の被処理部の大きさが電極１０１の断面に比べて大きい場合には、一度にワーク１０３の被処理部に沿って肉盛層１０７を形成することができず、ワーク１０３に対する電極１０１の対向位置を変更して、複数回に分けて表面処理を行う必要がある。しかしながら、前述の場合にあっては、各回毎の表面処理によって形成された肉盛層１０７の境界部分１０７ａに、接合不十分な欠陥Ｄが生じ易く、ワーク１０３の被処理部１０５に対する表面処理の品質が安定しないという問題がある。 On the other hand, as shown in FIG. 5B, when the length of the processed portion 105 of the workpiece 103 is longer than the width of the electrode 101, or the size of the processed portion of the workpiece 103 is larger than the cross section of the electrode 101. If it is large, the overlay layer 107 cannot be formed along the processed portion of the workpiece 103 at a time, and the surface treatment is performed in multiple steps by changing the position of the electrode 101 facing the workpiece 103. There is a need. However, in the above-described case, an insufficiently bonded defect D is likely to occur in the boundary portion 107a of the built-up layer 107 formed by the surface treatment for each time, and the surface treatment of the workpiece 105 of the workpiece 103 is performed. There is a problem that the quality is not stable.
請求項１に記載の発明にあっては、金属を主成分とする粉末から成形した成形体、若しくは加熱処理した前記成形体により構成される電極を用い、
前記電極をワークの被処理部に沿って相対移動させつつ、電気絶縁性のある液中又は気中において前記ワークの前記被処理部と前記電極との間にパルス状の放電を発生させることにより、その放電エネルギーによって前記ワークの前記被処理部に前記電極の材料或いは該材料の反応物質を堆積、拡散、及び／又は溶着させて、前記ワークの前記被処理部に沿って肉盛層を連続して形成する方法であって、
更に、前記肉盛層の表面を平滑に仕上げるために、前記電極の相対移動中に、前記電極の材料の消耗によって前記電極の先端に形成される電極凹部の縁側と、前記電極の材料或いは該材料の反応物質によって前記ワークの前記被処理部に形成される肉盛凸部の裾側との間で、放電が継続されるようにしたことを特徴とする。
In the invention according to claim 1, using a molded body molded from a powder containing metal as a main component, or an electrode constituted by the heat-treated molded body,
By generating a pulsed discharge between the treated portion of the workpiece and the electrode in an electrically insulating liquid or air while relatively moving the electrode along the treated portion of the workpiece And depositing, diffusing and / or welding the material of the electrode or the reactant of the material on the treated portion of the workpiece by the discharge energy, and continuously depositing the build-up layer along the treated portion of the workpiece A method of forming
Further, in order to finish the surface of the build-up layer smoothly, the edge side of the electrode recess formed at the tip of the electrode due to the consumption of the electrode material during the relative movement of the electrode, the material of the electrode or the electrode It is characterized in that the discharge is continued between the hem side of the built-up convex part formed on the part to be processed of the workpiece by the reactant of the material.
ここで、「前記電極をワークの被処理部に沿って相対移動させる」とは、前記電極を前記ワークの前記被処理部に沿って移動させることの他に、前記電極を移動させることなく、前記ワークを前記電極に対して移動させることも含まれる。 Here, “relatively moving the electrode along the processed portion of the workpiece” means that the electrode is moved along the processed portion of the workpiece without moving the electrode. It also includes moving the workpiece relative to the electrode.
請求項１に記載の発明特定事項によると、前記電極をワークの被処理部に沿って相対移動させつつ、電気絶縁性のある液中又は気中において前記ワークの前記被処理部と前記電極との間にパルス状の放電を発生させることにより、前記ワークの前記被処理部に沿って前記肉盛層を連続して形成するため、前記ワークの前記被処理部の長さが前記電極の幅に比べて長い場合又は前記ワークの前記被処理部の大きさが前記電極の断面に比べて大きい場合であっても、表面処理によって形成された前記肉盛層に接合不十分な欠陥が生じることはない。 According to the invention specific matter of the first aspect , the to-be-processed portion of the workpiece and the electrode in the electrically insulating liquid or in the air while relatively moving the electrode along the to-be-treated portion of the workpiece. The build-up layer is continuously formed along the to-be-processed portion of the workpiece by generating a pulsed discharge between the workpiece and the length of the to-be-processed portion of the workpiece is the width of the electrode. Even when the length of the workpiece to be processed is larger than the cross section of the electrode, a defect in which the build-up layer formed by the surface treatment has insufficient bonding occurs. There is no.
また、前記電極凹部の縁側と前記肉盛凸部の裾側との間で放電が継続されるようにしてあるため、表面処理によって形成される前記肉盛層の表面を平滑に仕上げることができる。 Moreover, since the discharge between the skirt side of edge and the wall Moritotsu portion of the electrode recesses are to be continued, it is possible to finish the surface of the cladding layer formed by surface treatment to smooth .
請求項２に記載の発明にあっては、請求項１に記載の発明特定事項によると、前記ワークは、ガスタービンエンジンのエンジン部品であることを特徴とする。 In the invention described in claim 2, according to the subject matter of claim 1, wherein the workpiece is characterized by an engine component of a gas turbine engine.
請求項２に記載の発明特定事項によると、請求項１に記載の発明特定事項による作用と同様の作用を奏する。 According to the invention specific matter described in claim 2 , the same effect as the effect of the invention specific matter described in claim 1 is obtained.
請求項１又は請求項２に記載の発明よれば、前記ワークの前記被処理部の長さが前記電極の幅に比べて長い場合又は前記ワークの前記被処理部の大きさが前記電極の断面に比べて大きい場合であっても、表面処理によって形成された前記肉盛層に接合不十分な欠陥が生じることはないため、前記ワークの前記被処理部に対する表面処理の品質を安定させることができる。 According to invention of Claim 1 or Claim 2, when the length of the said to-be-processed part of the said workpiece | work is long compared with the width | variety of the said electrode, or the magnitude | size of the to-be-processed part of the said workpiece | work is a cross section of the said electrode. Even if it is larger than the above, since there is no insufficient bonding defect in the build-up layer formed by the surface treatment, the quality of the surface treatment of the workpiece to be treated can be stabilized. it can.
また、表面処理によって形成される前記肉盛層の表面を平滑に仕上げることできるため、前記ワークの前記被処理部に対する表面処理の品質を向上させることができる。 Moreover, since the surface of the build-up layer formed by the surface treatment can be finished smoothly, the quality of the surface treatment for the treated portion of the workpiece can be improved.
実施形態について図１から図４を参照して説明する。 An embodiment will be described with reference to FIGS. 1 to 4.
ここで、図１は、実施形態に係わる表面処理方法の要部を説明する図であって、図２及び図３は、実施形態に係わる表面処理方法を説明する図であって、図４は、実施形態に係わる放電加工機を説明する図である。なお、特許公報掲載時の図面の向きを基準として、「左右」とは、図中において左右のことであって、「前後」とは、図中において紙面に向かって表裏のことであって、「上下」とは、図中において上下のことである。 Here, FIG. 1 is a diagram for explaining a main part of the surface treatment method according to the embodiment, FIG. 2 and FIG. 3 are diagrams for explaining the surface treatment method according to the embodiment, and FIG. It is a figure explaining the electric discharge machine concerning embodiment. In addition, on the basis of the orientation of the drawing at the time of publication of the patent publication, “left and right” means left and right in the figure, and “front and back” means front and back in the figure toward the paper surface, “Up and down” means up and down in the drawing.
実施形態に係わる表面処理方法は、放電エネルギーを利用して、図２（ａ）に示すようなワーク１の被処理部３に対して表面処理を行うための方法であって、実施形態に係わる表面処理方法の実施には、図４に示すような放電加工機が用いられる。そこで、実施形態に係わる表面処理方法について説明する前に、実施形態に係わる放電加工機について説明する。 The surface treatment method according to the embodiment is a method for performing surface treatment on the processing target portion 3 of the workpiece 1 as shown in FIG. 2A using discharge energy, and relates to the embodiment. For the implementation of the surface treatment method, an electric discharge machine as shown in FIG. 4 is used. Therefore, before describing the surface treatment method according to the embodiment, the electric discharge machine according to the embodiment will be described.
図４に示すように、実施形態に係わる放電加工機５は、左右方向（換言すればＸ軸方向）及び前後方向（換言すればＹ軸方向）へ延びたベッド７を具備しており、このベッド７には、上下方向（換言すればＺ軸方向）に延びたコラム９が一体的に設けられている。 As shown in FIG. 4, the electric discharge machine 5 according to the embodiment includes a bed 7 extending in the left-right direction (in other words, the X-axis direction) and the front-rear direction (in other words, the Y-axis direction). The bed 7 is integrally provided with a column 9 extending in the vertical direction (in other words, in the Z-axis direction).
ベッド７には、Ｘ軸方向へ延びた一対（図４には１つのみ図示）のＸ軸ガイド１１が設けられており、一対のＸ軸ガイド１１には、Ｘ軸テーブル１３がＸ軸サーボモータ１５の駆動によりＸ軸方向へ移動可能に設けられている。また、Ｘ軸テーブル１３には、Ｙ軸方向へ延びた一対のＹ軸ガイド１７が設けられており、一対のＹ軸ガイド１７には、Ｙ軸テーブル１９がＹ軸サーボモータ２１の駆動によりＹ軸方向へ移動可能に設けられている。 The bed 7 is provided with a pair of X-axis guides 11 (only one is shown in FIG. 4) extending in the X-axis direction. The pair of X-axis guides 11 includes an X-axis table 13 and an X-axis servo. The motor 15 is driven so as to be movable in the X-axis direction. The X-axis table 13 is provided with a pair of Y-axis guides 17 extending in the Y-axis direction. A Y-axis table 19 is driven by a Y-axis servo motor 21 on the pair of Y-axis guides 17. It is provided so as to be movable in the axial direction.
Ｙ軸テーブル１９には、電気絶縁性のある加工油等の加工液Ｌを貯留する加工槽２３が設けられており、この加工槽２３内には、ワーク１を取付ける取付具２５が設けられてあって、この取付具２５は、電源２７に電気的に接続されている。 The Y-axis table 19 is provided with a processing tank 23 for storing a processing liquid L such as an electrically insulating processing oil, and a mounting tool 25 for mounting the workpiece 1 is provided in the processing tank 23. Thus, the fixture 25 is electrically connected to the power source 27.
コラム９におけるＹ軸テーブル１９の上方には、Z軸方向へ延びた一対のＺ軸ガイド２９が設けられており、一対のＺ軸ガイド２９には、加工ヘッド３１がＺ軸サーボモータ３３の駆動によりZ軸方向へ移動可能に設けられている。また、加工ヘッド３１には、電極３５を保持する電極ホルダ３７が一体的に設けられており、この電極ホルダ３７は、電源２７に電気的に接続されている。 A pair of Z-axis guides 29 extending in the Z-axis direction are provided above the Y-axis table 19 in the column 9, and the machining head 31 drives the Z-axis servomotor 33 on the pair of Z-axis guides 29. Is provided so as to be movable in the Z-axis direction. The processing head 31 is integrally provided with an electrode holder 37 that holds the electrode 35, and the electrode holder 37 is electrically connected to a power source 27.
ここで、電極３５は、金属を主成分とする粉末からプレスによる圧縮によって成形した成形体、若しくは加熱処理した前記成形体により構成されるものである。なお、電極３５は、圧縮によって成形する代わりに、泥漿、ＭＩＭ（Metal Injection Molding）、溶射等によって成形しても差し支えない。 Here, the electrode 35 is composed of a molded body molded from a powder containing a metal as a main component by compression with a press, or the molded body subjected to heat treatment. The electrode 35 may be formed by mud, MIM (Metal Injection Molding), thermal spraying or the like instead of being formed by compression.
次に、実施形態に係わる表面処理方法について説明する。 Next, the surface treatment method according to the embodiment will be described.
図２（ａ）に示すように、ワーク１の被処理部３が上方向を向いた状態の下で、取付具２５にワーク１を取付ける。これにより、ワーク１を放電加工機５の所定位置にセットすることができる。 As shown in FIG. 2A, the workpiece 1 is attached to the fixture 25 under a state in which the portion 3 to be processed of the workpiece 1 faces upward. Thereby, the workpiece 1 can be set at a predetermined position of the electric discharge machine 5.
次に、Ｘ軸サーボモータ１５の駆動によりＸ軸テーブル１３をＸ軸方向へ移動させると共に、Ｙ軸サーボモータ２１の駆動によりＹ軸テーブル１９をＹ軸方向へ移動させる。これにより、ワーク１をＸ軸方向及びＹ軸方向へ移動させることができ、換言すれば、電極３５をＸ軸方向及びＹ軸方向へワーク１に対して相対移動させることができ、図２（ｂ）に示すように、ワーク１の被処理部３の一端と電極３５を上下に対向させることができる。なお、電極３５をＸ軸方向及びＹ軸方向へ相対移動させることなく、Ｘ軸方向及びＹ軸方向のうちのいずれかの方向へ相対移動させるだけで足りる場合もある。 Next, the X axis table 13 is moved in the X axis direction by driving the X axis servo motor 15, and the Y axis table 19 is moved in the Y axis direction by driving the Y axis servo motor 21. Thereby, the workpiece 1 can be moved in the X-axis direction and the Y-axis direction, in other words, the electrode 35 can be moved relative to the workpiece 1 in the X-axis direction and the Y-axis direction. As shown in b), one end of the workpiece 3 of the workpiece 1 and the electrode 35 can be vertically opposed. In some cases, it is only necessary to relatively move the electrode 35 in either the X-axis direction or the Y-axis direction without relatively moving the electrode 35 in the X-axis direction and the Y-axis direction.
そして、Ｘ軸サーボモータ１５の駆動によって電極３５をワーク１の被処理部３に沿ってＸ軸方向へ相対移動させつつ、加工液Ｌ中においてワーク１の被処理部３と電極３５との間にパルス状の放電を発生させる。これにより、図３（ａ）（ｂ）に示すように、その放電エネルギーによってワーク１の被処理部３に電極３５の材料或いは該材料の反応物質（以下、適宜に前記材料等という）を堆積、拡散、及び／又は溶着（以下、適宜に堆積等という）させて、ワーク１の被処理部３に沿って肉盛層３９を連続して形成することができる。また、パルス状の放電を発生させる際に、Ｚ軸サーボモータ３３の駆動によって電極３５を加工ヘッド３１と一体的にＺ軸方向へ僅かな移動量だけ往復移動させる。なお、ワーク１の被処理部３の形状に応じて、電極３５をＸ軸方向へ相対移動させるだけではなく、Ｙ軸方向へ相対移動させたり、或いはＸ軸方向及びＹ軸方向へ相対移動させたりする場合もある。 Then, by driving the X-axis servomotor 15, the electrode 35 is relatively moved in the X-axis direction along the processed portion 3 of the workpiece 1, and the portion between the processed portion 3 of the workpiece 1 and the electrode 35 in the machining liquid L. To generate a pulsed discharge. As a result, as shown in FIGS. 3A and 3B, the material of the electrode 35 or the reaction material of the material (hereinafter referred to as the above-mentioned material or the like as appropriate) is deposited on the processing target 3 of the workpiece 1 by the discharge energy. The build-up layer 39 can be continuously formed along the to-be-processed part 3 of the workpiece 1 by diffusion, and / or welding (hereinafter, appropriately referred to as deposition or the like). Further, when generating a pulsed discharge, the electrode 35 is reciprocated in the Z-axis direction by a small amount of movement integrally with the machining head 31 by driving the Z-axis servomotor 33. Note that the electrode 35 is not only relatively moved in the X-axis direction, but is also relatively moved in the Y-axis direction, or is relatively moved in the X-axis direction and the Y-axis direction, depending on the shape of the processing target portion 3 of the workpiece 1. Sometimes.
ここで、肉盛層３９の表面を平滑に仕上げるために、電極３５の相対移動中に、図１に示すように、前記材料の消耗によって電極３５の先端に形成される電極凹部４１の縁側４１ａと、前記材料等の堆積等によってワーク１の被処理部３に形成される肉盛凸部４３の裾側４３ａとの間で、放電が継続されるようにしている。なお、電極凹部４１の縁側４１ａと肉盛凸部４３との間で放電が生じるようにすると、肉盛凸部４３だけが成長して、肉盛層３９の表面が平滑にならない。 Here, in order to finish the surface of the built-up layer 39 smoothly , as shown in FIG. 1, during the relative movement of the electrode 35 , the edge side 41a of the electrode recess 41 formed at the tip of the electrode 35 due to the consumption of the material. And discharge is continued between the hem side 43a of the build-up convex portion 43 formed on the workpiece 3 of the workpiece 1 by deposition of the material or the like. In addition, when discharge is generated between the edge side 41a of the electrode recess 41 and the buildup convex portion 43, only the buildup convex portion 43 grows, and the surface of the buildup layer 39 is not smooth.
また、「堆積、拡散、及び／又は溶着」とは、「堆積」、「拡散」、「溶着」、「堆積と拡散の２つの混合現象」、「堆積と溶着の２つの混合現象」、「拡散と溶着の２つの混合現象」、「堆積と拡散と溶着の３つの混合現象」のいずれも含む意である。 Further, “deposition, diffusion, and / or welding” means “deposition”, “diffusion”, “welding”, “two mixing phenomena of deposition and diffusion”, “two mixing phenomena of deposition and welding”, “ It is meant to include both “two mixing phenomena of diffusion and welding” and “three mixing phenomena of deposition, diffusion and welding”.
次に、実施形態の作用について説明する。 Next, the operation of the embodiment will be described.
電極３５をワーク１の被処理部３に沿って相対移動させつつ、加工液Ｌ中においてワーク１の被処理部３と電極３５との間にパルス状の放電を発生させることにより、ワーク１の被処理部３に沿って肉盛層３９を連続して形成するため、ワーク１の被処理部３の長さが電極３５の幅に比べて長い場合又はワーク１の被処理部の大きさが電極３５の断面に比べて大きい場合であっても、表面処理によって形成された肉盛層３９に接合不十分な欠陥が生じることはない。 By causing the electrode 35 to move relative to the workpiece 3 of the workpiece 1 and generating a pulsed discharge between the workpiece 3 of the workpiece 1 and the electrode 35 in the machining liquid L, the workpiece 1 Since the build-up layer 39 is continuously formed along the processing target 3, when the length of the processing target 3 of the workpiece 1 is longer than the width of the electrode 35, or the size of the processing target of the workpiece 1 is large. Even if it is larger than the cross section of the electrode 35, a defect of insufficient bonding does not occur in the built-up layer 39 formed by the surface treatment.
また、電極３５の相対移動速中に、電極凹部４１の縁側４１ａと肉盛凸部４３の裾側４３ａとの間で放電が継続されるようにしているため、表面処理によって形成される肉盛層３９の表面を平滑に仕上げることができる。 Also, during the relative movement speed of the electrode 35, the discharge between the skirt side 43a of edge 41a and meat Moritotsu portion 43 of the electrode recess 41 is to be continued, the meat is formed by a surface treatment Sheng The surface of the layer 39 can be finished smoothly.
以上の如き、実施形態によれば、ワーク１の被処理部３の長さが電極３５の幅に比べて長い場合又はワーク１の被処理部３の大きさが電極３５の断面に比べて大きい場合であっても、表面処理によって形成された肉盛層３９に接合不十分な欠陥が生じることはないため、ワーク１の被処理部３に対する表面処理の品質を安定させることができる。 As described above, according to the embodiment, when the length of the workpiece 3 of the workpiece 1 is longer than the width of the electrode 35 or the size of the workpiece 3 of the workpiece 1 is larger than the cross section of the electrode 35. Even if it is a case, since the imperfect joining defect does not arise in the build-up layer 39 formed by surface treatment, the quality of the surface treatment with respect to the to-be-processed part 3 of the workpiece | work 1 can be stabilized.
また、表面処理によって形成される肉盛層３９の表面を平滑に仕上げることできるため、ワーク１の被処理部３に対する表面処理の品質を向上させることができる。 Moreover, since the surface of the built-up layer 39 formed by the surface treatment can be finished smoothly, the quality of the surface treatment for the portion 3 to be processed of the workpiece 1 can be improved.
なお、実施形態に係わる表面処理方法は、捩れのあるガスタービン翼の先端等に肉盛層を形成する場合に適している。また、本発明は、前述の発明の実施形態の説明に限るものではなく、例えば、ワーク１をＸ軸方向及びＹ軸方向へ移動させる代わりに、加工ヘッド３１をＸ軸方向及びＹ軸方向へ移動させたり、加工液Ｌ中の代わりに、電気絶縁性のある気中においてパルス状の放電を発生させたりする等、適宜の変更を行うことにより、その他種々の態様で実施可能である。 Note that the surface treatment method according to the embodiment is suitable for forming a built-up layer on the tip of a gas turbine blade having a twist. Further, the present invention is not limited to the description of the above-described embodiment of the invention. For example, instead of moving the workpiece 1 in the X axis direction and the Y axis direction, the machining head 31 is moved in the X axis direction and the Y axis direction. The present invention can be implemented in various other modes by making appropriate changes such as moving or generating a pulsed discharge in the electrically insulating air instead of in the machining liquid L.
１ ワーク
３ 被処理部
５ 放電加工機
３５ 電極
３９ 肉盛層
４１ 電極凹部
４１ａ 縁側
４３ 肉盛凸部
４３ａ 裾側
DESCRIPTION OF SYMBOLS 1 Work 3 Processed part 5 Electric discharge machine 35 Electrode 39 Overlaying layer 41 Electrode recessed part 41a Edge side 43 Overlaying convex part 43a Bottom side
Claims (2)
前記電極をワークの被処理部に沿って相対移動させつつ、電気絶縁性のある液中又は気中において前記ワークの前記被処理部と前記電極との間にパルス状の放電を発生させることにより、その放電エネルギーによって前記ワークの前記被処理部に前記電極の材料或いは該材料の反応物質を堆積、拡散、及び／又は溶着させて、前記ワークの前記被処理部に沿って肉盛層を連続して形成する方法であって、
更に、前記肉盛層の表面を平滑に仕上げるために、前記電極の相対移動中に、前記電極の材料の消耗によって前記電極の先端に形成される電極凹部の縁側と、前記電極の材料或いは該材料の反応物質によって前記ワークの前記被処理部に形成される肉盛凸部の裾側との間で、放電が継続されるようにしたことを特徴とする表面処理方法。 Using a molded body molded from powder containing metal as a main component, or an electrode composed of the molded body heat-treated,
By generating a pulsed discharge between the treated portion of the workpiece and the electrode in an electrically insulating liquid or air while relatively moving the electrode along the treated portion of the workpiece And depositing, diffusing and / or welding the material of the electrode or the reactant of the material on the treated portion of the workpiece by the discharge energy, and continuously depositing the build-up layer along the treated portion of the workpiece A method of forming
Further, in order to finish the surface of the build-up layer smoothly, the edge side of the electrode recess formed at the tip of the electrode due to the consumption of the electrode material during the relative movement of the electrode, the material of the electrode or the electrode A surface treatment method characterized in that the discharge is continued between the hem side of the built-up convex part formed on the treated part of the workpiece by the reactant of the material.
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