US3835016A - Electrochemical grinding methods and apparatus - Google Patents

Electrochemical grinding methods and apparatus Download PDF

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Publication number
US3835016A
US3835016A US00269076A US26907672A US3835016A US 3835016 A US3835016 A US 3835016A US 00269076 A US00269076 A US 00269076A US 26907672 A US26907672 A US 26907672A US 3835016 A US3835016 A US 3835016A
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United States
Prior art keywords
workpiece
tool
grinding
electrolyte
electrolytic
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US00269076A
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English (en)
Inventor
H Bourdolle
S Lacroix
J Pinot
J Fleury
G Peuillot
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Peugeot & Renault
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Publication date
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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
    • B23H5/00—Combined machining
    • B23H5/06—Electrochemical machining combined with mechanical working, e.g. grinding or honing
    • B23H5/08—Electrolytic grinding
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S204/00—Chemistry: electrical and wave energy
    • Y10S204/12—Electrochemical machining

Definitions

  • a device for electrochemical grinding by removing material from the surface of a conducting workpiece comprising a conformator tool including two separate members, a first member for a quick attack of a rough shaped workpiece, comprising a support, one front-end of which is shaped as the compliment of the sectional contour to be obtained along the outer periphery of the workpiece, which operates during a first step of the operation; a high electrolyte flow output supply; a highdensity current electricity source; and the second member is an electrolytic grinder operating at the rear part of the support, for grinding the workpiece to the desired final shape, the rear part of the support constituting a damming bulk for the electrolyte.
  • the present invention relates in general to electrochemical grinding methods and apparatus, and has specific reference to improvements brought to these methods and apparatus with a view to increase considerably the rate of shaping of the workpiece to be treated while reducing appreciably the cost of the device for a given degree of precision of the operation.
  • Electrolytic grinding devices are already known Wherein a driving diamond grinding wheel receiving a negative charge and consisting of sintered copper is pressed against the workpiece connected to the positive terminal of a generator.
  • the rapidity of the attack is also proportional to the electrolyte output at the interface formed between the grinding wheel and the workpiece; now, this electrolyte output will always be greater during the initial period of the machining operation, when nothing prevents its flow between the workpiece and the grinding wheel.
  • the present invention is characterized by the combination, in a same operation, of successive attacks of the workpiece to be shaped by an electrolytic tool operating under a relatively large electrolyte output and with a high current density, so that said tool can operate very rapidly, with an electrolytic grinding action for grinding the previously obtained surface to its final dimensions.
  • FIG. 1 is a diagrammatic side-elevational view of a first embodiment of this invention.
  • FIG. 2 is a similar view showing a modified embodiment.
  • FIG. 1 illustrates a workpiece 1 connected to the positive terminal of a generator during the shaping of the workpiece by the electrolytic shaping tool 2 and the electrolytic grinding wheel 3 provided or notwith abrasive elements and both connected to the negative terminal of said generator (not shown).
  • the electrolytic shaping tool 2 consists-essentially of a massive member of which the lower end portion 8 has a contour complimentary to the sectional shape to be obtained or reproduced along the outer periphery of workpiece 1.
  • This tool 2 is carried by arms 9 connected to a link 7 or to any other suitable and known means permitting of presetting the tool 2 and more particularly adjusting the distance from this tool 2 to the workpiece 1.
  • the shaping tool 2 is connected via a conductor 4 to the negative terminal of the generator. It is supplied with electrolyte by means of conduits or hoses 5 and 6 controlled separately by valves 10, 10 and leading to the shaping tool proper and also to the grinding wheel 3; it will be seen that an inner volume is formed between the grinding wheel 3 and the rear portion of the tool 2,
  • the current generator has its positive terminal connected to the workpiece I and its negative terminal connected to both tool 2 and wheel 3.
  • the electrolyte is delivered via the hoses 5 and 6 and when the distance between the tool 2 and workpiece 1 is reduced sufliciently (but without producing an actual contact) the metal is attacked at A according to the shape of the surface 8 of tool 2.
  • the work performed at said point B consists in effecting an accurate grinding operation under a low current density.
  • the wheel 3 removes at B only a few hundredths of a millimeter of this metal. Therefore, the mechanical stress applied to this wheel 3 is relatively moderate and the wheel material may consist of a light alloy or other light-weight, moderate-strength and relatively cheap material such as graphite, in contrast with conventional machines requiring the use of stressresisting and considerably more expensive materials, such as sintered copper coated with diamond particles.
  • the graphite grinding wheel which is free of any abrasive substance and does not actually engage the workpiece, operating in this case only by electrolytic action.
  • the wheel 3 and tool 2 operate simultaneously until the entire outer periphery of the workpiece 1 has been treated by both means. However, when the rough-shaping tool 2 has completed its peripheral work, it is hacked and disconnected automatically, and the electrolyte flow issuing from conduit 5 is cut off by closing the valve 10 to prevent a second pass which, in the long run, would remove excessive material from the workpiece 1.
  • This operation may be programmed or controlled through any known and suitable means such as a device for detecting the workpiece dimension, for example an electric photocell.
  • the modified form of embodiment illustrated in FIG. 2 departs from the preceding one in that the electrolytic tool 22 is mounted independently of the grinding wheel 23.
  • the workpiece 21 receiving a positive charge is attacked by the tool 22 and subsequently by the electrolytic wheel 23, both tool and wheel being charged negatively and supplied separately and adjustably with electrolyte at 25 and 26, respectively.
  • the element 29 retained by spring 30 permits moderation of the electrolyte zflow from hose or conduit 26.
  • the tool 22 is adapted to be positioned by means of a known device 27 consisting for example of a handwheel controlling the longitudinal and transverse movements of said tool.
  • the direction of rotation in the embodiment of FIG. 2 is such that the rotational speeds of the grinding wheel and of the workpiece add themselves at point B, thus improving the machining performances and efiiciency.
  • a device for electrochemically grinding workpieces by removing material from the surface of conducting work-pieces comprising: tool means for shaping a movable workpiece, a source of electrical current having one pole connected to said tool means and a second pole for connection to a workpiece; means for supplying an electrolyte fluid to said tool means; said tool means comprising a first member for rapidly electrolytically attacking a rough-shaped rotating workpiece said first member comprising a support forming an electrolytic tool having a stationary front end shaped as a complimentary negative of the sectional contour to be obtained on a workpiece, and including means for inputting a high flow of electrolyte fluid and a terminal for a high-density current supply; and a second member comprising an electrolytic grinding wheel located separate from, but at the rear part of, said support, for grinding a rough-shaped workpiece after passage of said workpiece near said first member support; and the rear part of said support additionally comprising a damming bulk for retaining electrolyte fluid.
  • the device of claim 2 including means for rotating said electrolytic grinding wheel and a workpiece in the same direction of rotation.
  • the device of claim 1 including means for rotating said electrolytic grinding wheel and a workpiece in opposite directions of rotation.
  • a device for electrochemically forming workpieces comprising: means for removing material from the surface of an electrically conductive workpiece, comprising a first tool having a stationary working surface shaped as the compliment of the sectional contour desired to be obtained on a workpiece, with means for supplying electrolyte fluid through said first tool to said working surface, and means for supplying a high density current to the working surface of said first tool;
  • a second tool comprising an electrolytic rotating grinding wheel and mean for supplying electrolyte fluid to a nip space between the surface of said wheel and the path of the surface of a rotating conductive workpiece, and means for supplying a current to the surface of said grinding wheel;
  • said second tool being located downstream from said first tool along the path of the surface of said rotating conductive workpiece;
  • adjustable support means upon which said first tool is supported for adjusting the position of the working face of said first tool with respect to the path of the surface of said rotating conductive workpiece;
  • a source of electric current having one pole connected to said tools, and another pole counectable to a conductive workpiece;
  • 5 6 means for controlling the amount of electrolyte fluid 3,476,662 11/1969 Inoue 204224 M supplied to said nip space in proportion to the size 3,410,980 11/ 1968 Gugger et a1. 204129.35 X of said nip space; and means for retaining said electrolyte fluid emerging FOREIGN PATENTS from the path of the surface of said rotating con- 5 75 22 5 /1959 Switzerland 5 ductive workpiece.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
US00269076A 1971-07-26 1972-07-05 Electrochemical grinding methods and apparatus Expired - Lifetime US3835016A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7127282A FR2146925A1 (enrdf_load_stackoverflow) 1971-07-26 1971-07-26

Publications (1)

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US3835016A true US3835016A (en) 1974-09-10

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US00269076A Expired - Lifetime US3835016A (en) 1971-07-26 1972-07-05 Electrochemical grinding methods and apparatus

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US (1) US3835016A (enrdf_load_stackoverflow)
CH (1) CH564400A5 (enrdf_load_stackoverflow)
DE (1) DE2236406A1 (enrdf_load_stackoverflow)
FR (1) FR2146925A1 (enrdf_load_stackoverflow)
GB (1) GB1399722A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5454921A (en) * 1993-09-14 1995-10-03 Seiko Seiki Kabushiki Kaisha Electrolytic combined processing machine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116604333B (zh) * 2023-04-19 2024-07-12 江苏大学 旋转甩出微细液流传导激光与电化学微加工装置及方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5454921A (en) * 1993-09-14 1995-10-03 Seiko Seiki Kabushiki Kaisha Electrolytic combined processing machine

Also Published As

Publication number Publication date
FR2146925A1 (enrdf_load_stackoverflow) 1973-03-09
CH564400A5 (enrdf_load_stackoverflow) 1975-07-31
GB1399722A (en) 1975-07-02
DE2236406A1 (de) 1973-02-08

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