KR101074595B1 - EDM elctrode structure for side seal slot of the gas turbine nozzles - Google Patents

EDM elctrode structure for side seal slot of the gas turbine nozzles Download PDF

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KR101074595B1
KR101074595B1 KR1020090105413A KR20090105413A KR101074595B1 KR 101074595 B1 KR101074595 B1 KR 101074595B1 KR 1020090105413 A KR1020090105413 A KR 1020090105413A KR 20090105413 A KR20090105413 A KR 20090105413A KR 101074595 B1 KR101074595 B1 KR 101074595B1
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South Korea
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electrode
cooling water
discharge
cavity
gas turbine
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KR1020090105413A
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Korean (ko)
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KR20110048720A (en
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이택운
김철승
박상열
이영우
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한전케이피에스 주식회사
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
    • B23H1/04—Electrodes specially adapted therefor or their manufacture
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H9/00—Machining specially adapted for treating particular metal objects or for obtaining special effects or results on metal objects
    • B23H9/10—Working turbine blades or nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H9/00—Machining specially adapted for treating particular metal objects or for obtaining special effects or results on metal objects
    • B23H9/14—Making holes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/12—Arrangements for cooling or lubricating parts of the machine

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Abstract

본 발명은 발전용 가스터빈에 있어서 고정익 측면부에 홈을 형성하기 위하여 사용되는 방전가공용 전극구조에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode structure for electric discharge machining, which is used to form grooves in the side surfaces of a fixed blade in a power generation gas turbine.

본 발명에 의하면, 방전가공기와 연결이 이루어지는 연결부와, 상기 연결부와 결합되고 하부에 전극을 설치하기 위한 전극고정부와, 그리고 상기 전극고정부의 내측에 일부가 결합 설치되는 전극부를 포함하여 이루어지되, 상기 전극고정부엔 냉각수를 공급하기 위한 냉각수공급연결부와 냉각수를 전극으로 분배하여 공급하기 위한 공동을 마련하여 이루어지고, 상기 전극부의 내부엔 저부에 냉각수방출부가 마련된 냉각수통로를 다수 형성하고 상기 다수의 냉각수통로는 상기 공동과 연통되도록 각각 마련되어 이루어지는 가스터빈 고정익 측면부 홈의 방전가공용 전극구조를 제공한다.According to the present invention, the connection is made to the discharge processing machine, the electrode is coupled to the connection portion and the electrode fixing portion for installing the electrode on the bottom, and the electrode portion is coupled to the inside of the electrode fixing portion is installed And providing a cooling water supply connection part for supplying cooling water to the electrode fixing part and a cavity for distributing and supplying cooling water to the electrode, and forming a plurality of cooling water passages provided with a cooling water discharge part at the bottom of the electrode part. The cooling water passages of the gas turbine fixed blade side portion grooves are provided so as to be in communication with the cavity provides an electrode structure for electrical discharge machining.

발전, 가스터빈, 고정익, 측면부 홈, 방전가공, 전극 Power Generation, Gas Turbine, Fixed Wing, Side Groove, Discharge Machining, Electrode

Description

가스터빈 고정익 측면부 홈 방전가공용 전극구조{EDM elctrode structure for side seal slot of the gas turbine nozzles}EDM elctrode structure for side seal slot of the gas turbine nozzles}

본 발명은 발전용 가스터빈에 있어서 고정익 측면부에 홈을 형성하기 위하여 사용되는 방전가공용 전극구조에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode structure for electric discharge machining, which is used to form grooves in the side surfaces of a fixed blade in a power generation gas turbine.

일반적으로 발전용 가스터빈에서 연소부는 연료와 공기가 혼합되어 연소되는 연소기와 고온의 연소가스를 터빈 방향으로 전달하는 유도관으로 구성되고, 터빈은 연소부에서 전달된 고온의 가스가 통과하는 터빈케이싱의 링 세그먼트에 원주방향으로 조립된 고정익과 회전체인 터빈 로터 휠에 원주방향으로 조립된 회전익이 몇개의 단으로 구성되어 조립된다.In general, in the gas turbine for power generation, the combustion unit is composed of a combustor in which fuel and air are combusted and an induction pipe for delivering high temperature combustion gas in a turbine direction, and the turbine is a turbine casing through which high temperature gas transmitted from the combustion unit passes. The fixed blade circumferentially assembled in the ring segment of the rotary segment and the rotor blade circumferentially assembled in the turbine rotor wheel, which are rotating bodies, are composed of several stages.

이때, 고정익은 일반적으로 가운데 중공의 에어포일과 링 세그먼트에 조립되는 바깥쪽 측벽면과 안쪽의 측벽면으로 구성되며, 냉각 성능 및 효율을 높이기 위하여 냉각공들이 각 부위에 분포하게 된다. 또한 원주방향으로는 양 측면에 인접한 고정익과 조립되는데 고정익과 고정익 사이엔 가스터빈의 효율을 높이기 위하여 터빈 내에 흐르는 고온의 가스가 누설되지 않도록 금속판의 시일이 일정하게 조립되어 있으며, 이 금속판의 시일을 조립하기 위해서는 고정익에 홈을 가공하게 되는데 일반적으로 전극형상을 상기홈 형상에 맞게 가공하여 방전가공을 행하고 시일홈을 가공하게 된다.At this time, the fixed blade is generally composed of the outer side wall surface and the inner side wall surface assembled in the middle airfoil and the ring segment, the cooling holes are distributed in each part to increase the cooling performance and efficiency. In addition, in the circumferential direction, it is assembled with fixed blades adjacent to both sides. In order to increase the efficiency of the gas turbine between the fixed blades and the fixed blades, the seals of the metal plates are assembled to prevent leakage of hot gas flowing in the turbine. In order to assemble, the grooves are processed in the fixed blade, and in general, the electrode shape is processed according to the groove shape to perform the discharge processing and the seal grooves.

그리하여 상기 시일홈을 가공하기 위하여 시일홈의 형상에 맞게 가공된 전극과 이 전극을 고정하는 고정장치를 방전가공기에 장착하여 전극이 가공지점에 도달할수 있게 전극을 반복적으로 상하 수직운동을 시키면서 발생하는 방전현상을 이용하여 가공을 행하게 된다.Thus, in order to process the seal groove, the electrode machined in accordance with the shape of the seal groove and a fixing device for fixing the electrode are mounted on the electric discharge machine, and the electrode is repeatedly generated vertically and vertically to reach the processing point. Processing is performed by using the discharge phenomenon.

이와 같이 방전가공을 하는 경우 가공소요시간은 가공되는 면과 전극이 맞닿게 되는 면적에 반비례하고 전류의 세기에 비례하게 되는 관계가 성립하게 된다.As described above, in the case of electric discharge machining, the processing time is inversely proportional to the area where the surface to be processed is in contact with the electrode and is in proportion to the current intensity.

따라서, 적정의 가공조건으로 하나의 시일홈을 가공하는데 소요되는 시간이 약 10시간 소요된다면 16개의 시일홈을 가공하게 되는 경우 약 160시간 이상이 소요되게 되며, 방전가공시에 발생되는 산화물들이 가공부 내에서 배출되지 않고 쌓여 있게 된다면 가공부위의 품질에 신뢰성이 떨어지게 되고 가공시간은 예상시간보다 훨씬 많이 소요되어 가공효율이 크게 낮아지게 되는 문제가 발생하게 된다.Therefore, if the time required for processing one seal groove is about 10 hours under the proper processing conditions, it takes about 160 hours or more when 16 seal grooves are processed, and oxides generated during discharge processing are processed. If it is accumulated without being discharged from inside the parts, the quality of the machining site is less reliable and the machining time takes much longer than expected time, which causes a problem of significantly lowering the machining efficiency.

본 발명은 위와 같은 종래의 문제점을 해소하기 위하여 연구 개발이 이루어진 것으로 본 발명의 목적은 다음과 같다.The present invention has been made to research and development in order to solve the above conventional problems, the object of the present invention is as follows.

본 발명의 목적은 전극부의 구성을 획기적으로 개선하여 방전가공 중에 냉각수가 가공부 방향으로 고르게 배출되도록 하여 시일홈을 가공하는데 소요되는 시간을 크게 단축하여 가공효율을 향상시키고 방전가공시 발생되는 산화물이 가공부 내부에서 바로 바로 배출되면서 가공이 연속적으로 이루어져 가공품질 또한 향상시키고자 함에 있다. An object of the present invention is to significantly improve the configuration of the electrode portion to discharge the cooling water in the direction of the processing portion evenly during the discharge processing to greatly shorten the time required to process the seal groove to improve the processing efficiency and the oxide generated during the discharge processing It is intended to improve processing quality by continuously processing while being discharged directly from inside the processing part.

본 발명은 위와 같은 목적을 달성하기 위하여, 방전가공기와 연결이 이루어지는 연결부와, 상기 연결부와 결합되고 하부에 전극을 설치하기 위한 전극고정부와, 그리고 상기 전극고정부의 내측에 일부가 결합 설치되는 전극부를 포함하여 이루어지되, 상기 전극고정부엔 냉각수를 공급하기 위한 냉각수공급연결부와 냉각수를 전극으로 분배하여 공급하기 위한 공동을 마련하고, 배면본체의 전면에 전면판을 고정 설치하며, 상기 배면본체엔 일측에 냉각수공급연결부가 설치되고 이 냉각수공급연결부와 서로 연통되는 위치에 공동을 마련하며 상기 공동과 인접한 위치로서 하부엔 전극설치홈을 마련하여 전극부를 결합 설치한 상태에서 상기 전면판을 상기 배면본체와 체결구에 의하여 체결고정하여 그 구성이 이루어지고, 상기 전극부의 내부엔 저부에 냉각수방출부가 마련된 냉각수통로를 다수 형성하고 상기 다수의 냉각수통로는 입구부가 상기 공동과 연통되도록 각각 마련되어 이루어지는 가스터빈 고정익 측면부 홈의 방전가공용 전극구조를 제공한다. The present invention, in order to achieve the above object, the connection portion and the connection is made to the discharge processing machine, the electrode fixing portion for coupling with the connection portion and to install the electrode on the bottom, and a part of the inside of the electrode fixing portion is installed Comprising an electrode portion, provided with a cooling water supply connection for supplying the cooling water to the electrode fixing portion and the cavity for distributing and supplying the cooling water to the electrode, and fixed to the front plate on the front of the rear body, the rear body A cooling water supply connection part is installed at one side of the yen, and a cavity is provided at a position in communication with the cooling water supply connection part, and an electrode installation groove is provided at a lower side as a position adjacent to the cavity, and the front plate is coupled with the electrode part. The fastening is fixed by the main body and fasteners, and its configuration is achieved. Forming a plurality of cooling water passage cooling water emitting portion is provided, and the plurality of cooling water passages provides a discharge machining electrode structure of a gas turbine stator blade side face groove formed respectively provided to communicate with the inlet portion the cavity.

그리하여 본 발명에 의하면, 방전가공 중에 냉각수가 가공부 방향으로 고르 게 배출되도록 하여 시일홈을 가공하는데 소요되는 시간을 크게 단축하여 가공효율을 향상시키고 방전가공시 발생되는 산화물이 가공부 내부에서 바로 바로 배출되면서 가공이 연속적으로 이루어져 가공품질도 향상시킬 수 있다. Therefore, according to the present invention, the cooling water is evenly discharged toward the processing part during discharge processing, thereby greatly shortening the time required for processing the seal grooves, thereby improving processing efficiency, and the oxides generated during the discharge processing are directly inside the processing part. As it is discharged, the processing can be done continuously and the processing quality can be improved.

이하, 첨부된 도면을 참조하여 본 발명의 바람직한 예에 대하여 보다 상세하게 살펴보기로 한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

본 발명의 바람직한 예에 의하면 공통적으로 방전가공기와 연결이 이루어지는 연결부(1)와, 상기 연결부(1)와 결합되고 하부에 전극을 설치하기 위한 전극고정부(2)와, 그리고 상기 전극고정부(2)의 내측에 일부가 결합 설치되는 전극부(3)를 포함하여 이루어지되, 상기 전극고정부(2)엔 냉각수를 공급하기 위한 냉각수공급연결부(20)와 냉각수를 전극으로 분배하여 공급하기 위한 공동(22)을 마련하여 이루어지고, 상기 전극부(3)의 내부엔 저부에 냉각수방출부(30)가 마련된 냉각수통로(32)를 다수 형성하고 상기 다수의 냉각수통로(32)는 상기 공동(22)과 연통되도록 각각 마련되어 이루어지게 된다.According to a preferred embodiment of the present invention, the connection part 1 which is commonly connected with the discharge processing machine, the electrode fixing part 2 for coupling the connection part 1 and installing the electrode in the lower part, and the electrode fixing part ( 2) comprises an electrode part 3 is coupled to the inside of the installation portion, but the cooling water supply connecting portion 20 for supplying the cooling water to the electrode fixing part (2) and for distributing the cooling water to the electrode for supplying A plurality of cooling water passages 32 are formed by providing a cavity 22, and a plurality of cooling water passages 32 having a cooling water discharge portion 30 formed at a bottom thereof in the electrode portion 3, and the plurality of cooling water passages 32 are formed in the cavity ( 22) are provided to communicate with each other.

이때, 상기 전극고정부(2)는 배면본체(24)의 전면에 전면판(26)을 고정 설치하여 이루어지되, 상기 배면본체(24)엔 일측에 냉각수공급연결부(20)가 설치되고 이 냉각수공급연결부(20)와 서로 연통되는 위치에 공동(22)을 마련하며 상기 공동(22)과 인접한 위치로서 하부엔 전극설치홈(28)을 마련하여 전극부(3)를 결합 설치한 상태에서 상기 전면판(26)을 상기 배면본체(24)와 체결구(29)에 의하여 체결고정하여 그 구성이 이루어지게 된다.  At this time, the electrode fixing part 2 is made by fixing the front plate 26 on the front of the rear body 24, the cooling water supply connection portion 20 is installed on one side of the rear body 24 and the cooling water The cavity 22 is provided at a position in communication with the supply connection portion 20, and the electrode installation groove 28 is provided at the lower portion as a position adjacent to the cavity 22, so that the electrode portion 3 is coupled and installed. The front plate 26 is fastened and fastened by the rear body 24 and the fasteners 29 to be configured.

다음, 상기 전극부(3)는 내부에 저부의 냉각수방출부(30)가 마련된 냉각수통로(32)를 다수 형성하고 상기 다수의 냉각수통로(32)는 입구부(34)가 상기 공동(22)과 연통되도록 각각 마련되어 이루어지되, 상기 냉각수통로(32)의 입구부(34) 상호간 거리가 일정하게 다수 마련되고 또한 상기 냉각수방출부(30) 상호간 거리가 일정하게 다수 마련되어 결국 다수의 냉각수통로(32)가 경사지게 구성되어 가공부에서 산화물을 배출할 수 있도록 구성이 이루어진다.Next, the electrode portion 3 forms a plurality of cooling water passages 32 having a cooling water discharge portion 30 at the bottom thereof, and the plurality of cooling water passages 32 have an inlet portion 34 of the cavity 22. Is provided to communicate with each other, provided with a plurality of constant distance between the inlet portion 34 of the cooling water passages 32 and also a plurality of constant distance between the cooling water discharge unit 30 is provided in the end a number of cooling water passages (32) ) Is configured to be inclined so that the oxide can be discharged from the processing unit.

그리하여, 조립 설치시엔 전극설치홈(28)에 전극부(3)의 상부를 위치시키고 전면판(26)을 덮고 체결구(29)에 의하여 배면본체(24)와 전면판(26)을 서로 결합하여 조립 완성하게 된다. Therefore, during assembly installation, the upper part of the electrode part 3 is positioned in the electrode installation groove 28, covers the front plate 26, and the rear body 24 and the front plate 26 are coupled to each other by the fastener 29. Assembly is completed.

방전가공기에 연결부(1)를 서로 연결한 상태에서 방전가공을 수행하게 되는데, 이때 전극부(3)에 의하여 방전가공이 이루어지는 경우 냉각수공급연결부(20)를 통하여 냉각수를 공급하게 되면 냉각수는 공동(22)에서 모아졌다가 여러 입구부(34)를 통하여 분배되면서 각각의 냉각수통로(32)를 거쳐 냉각수방출부(30)를 통하여 가공부로 배출되고 이와같이 가공부로 배츨되는 냉각수에 의하여 방전가공시 가공부에서 발생되는 산화물을 외부로 원활하게 배출시키면서 방전가공이 이루어지게 되며 전체적으로 방전시간을 크게 단축시키면서 방전가공면에 대한 가공품질도 향상되게 된다.The discharge machining is performed in a state in which the connection parts 1 are connected to the discharge processor. When discharge processing is performed by the electrode part 3, the cooling water is supplied to the cooling water through the cooling water supply connection part 20. 22) is distributed through the various inlets 34 and discharged to the processing unit through the cooling water discharge unit 30 through the respective cooling water passages 32, the processing unit during the discharge processing by the cooling water discharged to the processing unit in this way Discharge processing is performed while smoothly discharging the oxide generated from the outside, and the processing quality on the discharge processing surface is also improved while greatly shortening the discharge time as a whole.

도 1은 본 발명의 바람직한 일례를 보여주는 사시도,1 is a perspective view showing a preferred example of the present invention,

도 2는 도 1의 정면도,2 is a front view of FIG. 1,

도 3은 도 1의 저면도.3 is a bottom view of FIG. 1.

<도면의 주요 부분에 대한 부호의 설명><Explanation of symbols for the main parts of the drawings>

1: 연결부, 2: 전극고정부,1: connection, 2: electrode fixing,

3: 전극부, 20: 냉각수공급연결부,3: electrode portion, 20: cooling water supply connection portion,

22: 공동, 24: 배면본체,22: cavity, 24: back body,

26: 전면판, 28: 전극설치홈,26: front panel, 28: electrode mounting groove,

29: 체결구, 30: 냉각수방출부,29: fastener, 30: cooling water discharge,

32: 냉각수통로, 34: 입구부32: cooling water passage, 34: inlet

Claims (3)

방전가공기와 연결이 이루어지는 연결부(1)와, 상기 연결부(1)와 결합되고 하부에 전극을 설치하기 위한 전극고정부(2)와, 그리고 상기 전극고정부(2)의 내측에 일부가 결합 설치되는 전극부(3)를 포함하여 이루어지되,A connection part 1 which is connected to an electric discharge machine, an electrode fixing part 2 coupled to the connection part 1 to install an electrode at a lower part thereof, and a part of the electrode fixing part 2 installed inside the electrode fixing part 2. Including the electrode portion 3 is made, 상기 전극고정부(2)엔 냉각수를 공급하기 위한 냉각수공급연결부(20)와 냉각수를 전극으로 분배하여 공급하기 위한 공동(22)을 마련하고, 배면본체(24)의 전면에 전면판(26)을 고정 설치하며,The electrode fixing part 2 is provided with a cooling water supply connecting portion 20 for supplying cooling water and a cavity 22 for distributing and supplying cooling water to the electrode, and the front plate 26 on the front of the rear body 24. Fixed installation, 상기 배면본체(24)엔 일측에 냉각수공급연결부(20)가 설치되고 이 냉각수공급연결부(20)와 서로 연통되는 위치에 공동(22)을 마련하며 상기 공동(22)과 인접한 위치로서 하부엔 전극설치홈(28)을 마련하여 전극부(3)를 결합 설치한 상태에서 상기 전면판(26)을 상기 배면본체(24)와 체결구(29)에 의하여 체결고정하여 그 구성이 이루어지고,Cooling water supply connecting portion 20 is installed at one side of the rear main body 24 and provides a cavity 22 at a position in communication with the cooling water supply connecting portion 20 and the lower electrode as a position adjacent to the cavity 22. The front plate 26 is fastened and fastened by the rear body 24 and the fastener 29 in a state in which the installation groove 28 is installed and the electrode unit 3 is coupled and installed. 상기 전극부(3)의 내부엔 저부에 냉각수방출부(30)가 마련된 냉각수통로(32)를 다수 형성하고 상기 다수의 냉각수통로(32)는 입구부(34)가 상기 공동(22)과 연통되도록 각각 마련되어 이루어지는 것을 특징으로 하는 가스터빈 고정익 측면부 홈 방전가공용 전극구조.A plurality of cooling water passages 32 having a cooling water discharge portion 30 are formed in the bottom of the electrode portion 3, and the plurality of cooling water passages 32 have an inlet portion 34 communicating with the cavity 22. Electrode structure for gas discharge fixed blade side portion groove discharge processing, characterized in that each provided so as to be provided. 삭제delete 제1항에 있어서,The method of claim 1, 상기 냉각수통로(32)의 입구부(34) 상호간 거리가 일정하게 다수 마련되고 상기 냉각수방출부(30) 상호간 거리가 일정하게 다수 마련되며 다수의 냉각수통로(32)가 경사지게 구성되어 가공부에서 산화물을 배출할 수 있도록 구성이 이루어지는 것을 특징으로 하는 가스터빈 고정익 측면부 홈 방전가공용 전극구조.The distance between the inlets 34 of the cooling water passage 32 is provided in a constant manner, the distance between the cooling water discharge units 30 is provided in a constant manner, and the plurality of cooling water passages 32 are inclined to form an oxide in the processing unit. Electrode structure for gas discharge fixed blade side portion groove electric discharge machining, characterized in that the configuration is made to discharge.
KR1020090105413A 2009-11-03 2009-11-03 EDM elctrode structure for side seal slot of the gas turbine nozzles KR101074595B1 (en)

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US20040217090A1 (en) 2003-05-01 2004-11-04 Scott Spitza Electrical discharge machining electrode holder
JP2009220200A (en) 2008-03-14 2009-10-01 Jtekt Corp Fluid feeding unit

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040217090A1 (en) 2003-05-01 2004-11-04 Scott Spitza Electrical discharge machining electrode holder
JP2009220200A (en) 2008-03-14 2009-10-01 Jtekt Corp Fluid feeding unit

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