US20150041331A1 - Electrolytic machining system and method - Google Patents

Electrolytic machining system and method Download PDF

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Publication number
US20150041331A1
US20150041331A1 US14/451,959 US201414451959A US2015041331A1 US 20150041331 A1 US20150041331 A1 US 20150041331A1 US 201414451959 A US201414451959 A US 201414451959A US 2015041331 A1 US2015041331 A1 US 2015041331A1
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United States
Prior art keywords
cathode
workpiece
controller
electrolytes
electro
Prior art date
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Abandoned
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US14/451,959
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English (en)
Inventor
Shao-Han Chang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hon Hai Precision Industry Co Ltd
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Hon Hai Precision Industry Co Ltd
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Filing date
Publication date
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Assigned to HON HAI PRECISION INDUSTRY CO., LTD. reassignment HON HAI PRECISION INDUSTRY CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHANG, SHAO-HAN
Publication of US20150041331A1 publication Critical patent/US20150041331A1/en
Abandoned legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F3/00—Electrolytic etching or polishing
    • C25F3/16—Polishing
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F7/00—Constructional parts, or assemblies thereof, of cells for electrolytic removal of material from objects; Servicing or operating
    • 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
    • B23H11/00—Auxiliary apparatus or details, not otherwise provided for
    • B23H11/003—Mounting of workpieces, e.g. working-tables
    • 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
    • B23H3/00—Electrochemical machining, i.e. removing metal by passing current between an electrode and a workpiece in the presence of an electrolyte
    • 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
    • B23H3/00—Electrochemical machining, i.e. removing metal by passing current between an electrode and a workpiece in the presence of an electrolyte
    • B23H3/02—Electric circuits specially adapted therefor, e.g. power supply, control, preventing short circuits
    • 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
    • B23H3/00—Electrochemical machining, i.e. removing metal by passing current between an electrode and a workpiece in the presence of an electrolyte
    • B23H3/10—Supply or regeneration of working media
    • 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
    • B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
    • B23H7/26—Apparatus for moving or positioning electrode relatively to workpiece; Mounting of electrode
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F3/00—Electrolytic etching or polishing
    • C25F3/02—Etching
    • 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
    • B23H3/00—Electrochemical machining, i.e. removing metal by passing current between an electrode and a workpiece in the presence of an electrolyte
    • B23H3/08—Working media

Definitions

  • the subject matter herein generally relates to an electrolytic machining apparatus and method which uses hollow electrode tool.
  • Electrolytic machining is performed by concentrating electrodissolution on certain parts of a workpiece as required to form recesses, bores, patterns, etc.
  • FIG. 1 is a diagrammatic view of an embodiment of an electrolytic machining system.
  • FIG. 2 is a flowchart of a method for electrolytic machining using system of FIG. 1 .
  • Coupled is defined as connected, whether directly or indirectly through intervening components, and is not necessarily limited to physical connections.
  • the connection can be such that the objects are permanently connected or releasably connected.
  • inside indicates that at least a portion of a region is partially contained within a boundary formed by the object.
  • substantially is defined to be essentially conforming to the particular dimension, shape, or other feature that the term modifies, such that the component need not be exact. For example, “substantially cylindrical” means that the object resembles a cylinder, but can have one or more deviations from a true cylinder.
  • comprising when utilized, means “including, but not necessarily limited to”; it specifically indicates open-ended inclusion or membership in the so-described combination, group, series and the like.
  • An electrolytic machining system can include a controller, a feeding device coupled to the controller, a platform coupled to the controller and positioned opposite the feeding device, an electrolysis cell installed on the platform and configured to receive a workpiece used as an anode, a cathode coupled to the drive member, a power supply module electrically coupled to the controller and the cathode, a processing tank communicating with the electrolysis cell and configured to store a plurality of electrolytes, a pump communicating with the processing tank and configured to pump the stored electrolytes out of the processing tank, and an electro-hydraulic servo valve communicating with the pump and the cathode and coupled to the controller.
  • the feeding device can be configured to translate the cathode in a direction toward and away from the workpiece in an initialization processing gap.
  • the power supply module can be configured to be electrically coupled to the workpiece.
  • the electro-hydraulic servo valve can be configured to adjust a flux of the electrolytes passing through the electro-hydraulic servo valve.
  • the controller can be configured to control the electro-hydraulic servo valve to be opened at a predetermined injection frequency, and thereby adjust the flux to a predetermined injection flux during translation of the cathode with respect to the workpiece, so as to enable the electrolytes received in a machining area of the workpiece to have a stable hydraulic pressure while the cathode is in the initialization processing gap.
  • a method for electrolytic machining of a workpiece can include the following procedures; an initialization processing gap, a processing voltage, a predetermined injection frequency of electrolytes, and a predetermined injection flux of electrolytes are set in a controller; a workpiece is installed and positioned in an electrolysis cell, by a platform moving the electrolysis cell; the workpiece is positioned in the initialization processing gap by a drive member, a plurality of electrolytes are provided to an electro-hydraulic servo valve and a cathode by a pump, the cathode is translated in a direction toward and away from the workpiece in the processing gap to machine the workpiece, simultaneously controlling the electro-hydraulic servo valve to enable the electrolytes to flow into the cathode at the initialization predetermined injection frequency and flux.
  • FIG. 1 illustrates an embodiment of an electrolytic machining system 100 configured to machine a workpiece 300 which is used as an anode.
  • the electrolytic machining system 100 can include a controller 10 , a drive member 21 , a feeding device 23 , a platform 25 , a fixture 30 , a cathode 40 , a power supply module 50 , an electrolysis cell 60 , a processing tank 70 , a pump 80 , an electro-hydraulic servo module 90 , a plurality of wires 200 , and a plurality of supply pipes 400 .
  • the drive member 21 can be coupled to the controller 10 and configured to control the drive member 21 .
  • the feeding device 23 and the platform 25 can be coupled to the drive member 21 .
  • the drive member 21 can be configured to drive the feeding device 23 and the platform 25 to move.
  • the controller 10 can be a computer; the feeding device 23 can be placed above the platform 25 and spaced from the platform 25 .
  • the feeding device 23 can be a lifting mechanism and installed on the platform 25 .
  • the drive member 21 can be integrated in the controller 10 , and the controller 10 can be configured to drive the feeding device 23 and the platform 25 to move directly.
  • the fixture 30 can be substantially rectangular and firmly installed on an end portion of the feeding device 23 .
  • the drive member 21 can be configured to drive the fixture 30 to move along a Z-axis.
  • the fixture 30 can define an opening (not shown) on an end portion and a channel (not shown) communicating with the opening on an inside portion.
  • the feeding device 23 can drive the fixture 30 to translate in a direction toward and away from the platform 25 at an moving frequency in a processing gap, so that the cathode 40 fixed on the fixture 30 can vibrate or pulsate at the moving frequency in the processing gap to machine the workpiece 300 .
  • a vibrator (not shown), such as an ultrasonic wave generator, can be installed on the fixture 30 or the workpiece 300 as long as an electrode, such as the workpiece 300 or the cathode 40 , vibrates while machining the workpiece 300 .
  • the power supply module 50 can include a pulse power supply 52 and a current sensor 54 .
  • the pulse power supply 52 can be electrically coupled to the controller 10 via a wire 200 and configured to covert a voltage transporting from the controller 10 to a pulse voltage.
  • the current sensor 54 can be electrically coupled to the controller 10 via a wire 200 .
  • the cathode 40 can be firmly installed on the fixture 30 .
  • the cathode 40 can be a hollow tube, be electrically coupled to the pulse power supply 52 , and communicate with the fixture 30 .
  • the current sensor 54 can be electrically coupled to the wire 200 which is coupled to the pulse power supply 52 and the cathode 40 , and configured to detect and feedback a current pulse flowing through the pulse power supply 52 and the cathode 40 to the controller 10 .
  • the controller 10 can control the drive member 21 to stop the feeding device 23 from moving toward the workpiece 300 via a detection result of the current sensor 54 .
  • the electrolysis cell 60 can be securely installed on the platform 25 .
  • the platform 25 can move the electrolysis cell 60 along an X-axis or along a Y-axis.
  • the electrolysis cell 60 can be substantially rectangular and define an opening 61 toward the feeding device 23 .
  • the electrolysis cell 60 can be configured to collect a plurality of electrolytes (not shown).
  • the processing tank 70 can communicate with the electrolysis cell 60 via a supply pipe 400 and can be configured to store the electrolytes.
  • the pump 80 can communicate with the processing tank 70 via a supply pipe 400 and can be configured to pump the stored electrolytes out of the processing tank 70 .
  • the electro-hydraulic servo module 90 can include a reservoir 92 , an electro-hydraulic servo valve 94 , and a servo controller 96 .
  • the reservoir 92 can communicate with the pump 80 via a supply pipe 400 and can be configured to store the electrolytes transported from the pump 80 .
  • a supply pipe 400 can communicate between the electro-hydraulic servo valve 94 , the reservoir 92 and the fixture 30 .
  • the servo controller 96 can be electrically coupled to the controller 10 and the electro-hydraulic servo valve 94 .
  • the controller 10 can be configured to control the servo controller 96 , and thereby control the electro-hydraulic servo valve 94 to adjust a flux of electrolytes to flow into the cathode 40 .
  • the electrolytes can flow into the cathode 40 at a predetermined injection frequency and a predetermined injection flux via the electro-hydraulic servo valve 94 .
  • the predetermined injection frequency of the electrolytes can match with the moving frequency of the feeding device 23 .
  • the servo controller 96 can be integrated in the controller 10 , and the controller 10 can control the electro-hydraulic servo valve to adjust the flux of electrolytes flowing into the cathode 40 .
  • the reservoir 92 can be omitted, and the electrolytes transporting from the pump 80 can be stored in the supply pipe 400 coupled to the pump 80 and the electro-hydraulic servo valve 94 .
  • the electrolytes can be circulated and reused from the processing tank 70 to the cathode 40 and the electrolysis cell 60 via the supply pipes 400 .
  • FIG. 2 illustrates a flowchart in accordance with an example embodiment.
  • the example method 500 is provided by way of example, as there are a variety of ways to carry out the method.
  • the method 500 described below can be carried out using the configurations illustrated in FIG. 1 , for example, and various elements of these figures are referenced in explaining example method 500 .
  • Each block shown in FIG. 2 represents one or more processes, methods or subroutines, carried out in the example method 500 . Additionally, the illustrated order of blocks is by example only and the order of the blocks can change according to the present disclosure.
  • the example method 500 for electrolytic machining of the workpiece 300 can begin at block 501 .
  • the controller sets an initialization processing gap, a processing voltage, the predetermined injection frequency of electrolytes, and the predetermined injection flux of electrolytes.
  • the controller controls the platform to move the electrolysis cell to position the workpiece, so that the workpiece is substantially positioned opposite the cathode.
  • the controller drives the feeding device to move toward the workpiece, and the cathode coupled to the feeding device is positioned in the initialization processing gap.
  • the workpiece can be electrically coupled to a positive side (+pole) of the pulse power supply
  • the cathode can be electrically coupled to a negative side ( ⁇ pole) of the pulse power supply.
  • the current sensor can detect the current pulse flowing through the power supply and the cathode, and feedback the current pulse to the controller.
  • the controller can control the feeding device to stop moving, so that the cathode coupled to the feeding device can be positioned in the initialization processing gap.
  • the pump transports the electrolytes to the electro-hydraulic servo valve via the supply pipe, and the electrolytes transported to the electro-hydraulic servo can have a stable hydraulic pressure.
  • the controller controls the feeding device to translate in the direction toward and away from the workpiece at the moving frequency in the initialization processing gap, thereby control the cathode to translate in the direction toward and away from the workpiece at the moving frequency in the initialization processing gap.
  • the controller simultaneously controls the electro-hydraulic servo valve to open at the predetermined injection frequency of electrolytes and to adjust the flux to the predetermined injection flux of electrolytes, so that the electrolytes flow into the cathode at the initialization predetermined injection frequency and flux to have a stable hydraulic pressure in a machining area of the workpiece.
  • the cathode 40 when the cathode 40 translates in the direction toward and away from the workpiece 300 among the initialization processing gap, the cathode 40 can have a stable speed.
  • the controller 10 can control the electro-hydraulic servo valve 94 to be closed, so that the electrolytes cannot pass through the electro-hydraulic servo valve 94 to the cathode 40 , and the electrolytes received in the machining area of the workpiece 300 can spill into the electrolysis cell 60 .
  • the controller 10 can control the electro-hydraulic servo valve 94 to be opened, so that the electrolytes can pass through the electro-hydraulic servo 94 at the initialization predetermined injection frequency and flux and flow into the cathode 40 , and thereby flowing into the machining area of the workpiece 300 via the cathode.
  • a flux of the electrolytes injected into the cathode 40 while the cathode 40 is moving away from the workpiece 300 can be twice as much as a flux discharged from the machining area while the cathode 40 is moving toward the workpiece 300 , so that the flux of the electrolytes discharged from the machining area while the cathode 40 is moving away from the workpiece 300 can be equal to that while the cathode 40 is moving toward the workpiece 300 , and the electrolytes received in the machining area can have a stable hydraulic pressure.
  • the controller 10 can control the electro-hydraulic servo valve 94 to be opened, as long as the flux of the electrolytes discharged from the machining area while the cathode 40 is moving away from the workpiece 300 is equal to that while the cathode 40 is moving toward the workpiece 300 .
  • a predetermined injection flux while the electro-hydraulic servo valve 94 is being opened is equal to a charging flux while the electro-hydraulic servo valve 94 is being closed, so that the predetermined injection flux while the cathode 40 is moving away from the workpiece 300 can be three times as much as the charging flux described above while the electro-hydraulic servo valve 94 is being closed.
  • the flux of the electrolytes discharged from the machining area while the cathode 40 is moving away from the workpiece 300 can be equal to that while the cathode 40 is moving toward the workpiece 300 .

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
US14/451,959 2013-08-09 2014-08-05 Electrolytic machining system and method Abandoned US20150041331A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2013103451126 2013-08-09
CN201310345112.6A CN104339044B (zh) 2013-08-09 2013-08-09 电解加工装置及其加工方法

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN113622015A (zh) * 2021-10-12 2021-11-09 深圳市景星天成科技有限公司 在线式电解抛光监测系统

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CN106001806B (zh) * 2016-06-12 2018-06-26 南京航空航天大学 大面积微坑阵列高精度电解加工的系统及方法
CN106077854A (zh) * 2016-07-11 2016-11-09 南京航空航天大学 内喷液电解磨铣加工系统及方法
CN106041236B (zh) * 2016-07-19 2018-05-29 清华大学 气膜冷却孔出口处热障涂层放电辅助化学加工扫描方法
CN108907383B (zh) * 2018-07-20 2019-11-15 常州工学院 一种电解气体产物的产生和收集装置
TWI742663B (zh) * 2020-05-15 2021-10-11 國立臺灣師範大學 電解加工設備及其方法
CN114309839A (zh) * 2020-09-30 2022-04-12 孙朝阳 微深孔制作工艺
CN112427753A (zh) * 2020-10-21 2021-03-02 周志容 一种模具后托电解加工方法
CN113832532B (zh) * 2021-08-17 2022-09-13 合肥工业大学 一种钨管外表面的高效电化学抛光装置及方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102198549A (zh) * 2011-05-20 2011-09-28 南京航空航天大学 脉动流场管电极电解加工方法及装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5820744A (en) * 1996-09-30 1998-10-13 Doncasters, Turbo Products Division Electrochemical machining method and apparatus
US6103094A (en) * 1998-08-24 2000-08-15 General Electric Company Method for controlling electrochemical drilling
CN100507092C (zh) * 2002-03-25 2009-07-01 株式会社荏原制作所 电解加工装置及电解加工方法
CN100411793C (zh) * 2006-04-30 2008-08-20 南京航空航天大学 微尺度线电极电解加工的微振动线电极系统
CN101011765A (zh) * 2007-01-25 2007-08-08 南京航空航天大学 电解液轴向流动的微细加工方法及其专用电极喷嘴

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102198549A (zh) * 2011-05-20 2011-09-28 南京航空航天大学 脉动流场管电极电解加工方法及装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113622015A (zh) * 2021-10-12 2021-11-09 深圳市景星天成科技有限公司 在线式电解抛光监测系统

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CN104339044B (zh) 2017-02-01
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CN104339044A (zh) 2015-02-11

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