US2798846A - Method and apparatus for the electrolytic erosion of work pieces - Google Patents

Method and apparatus for the electrolytic erosion of work pieces Download PDF

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Publication number
US2798846A
US2798846A US351722A US35172253A US2798846A US 2798846 A US2798846 A US 2798846A US 351722 A US351722 A US 351722A US 35172253 A US35172253 A US 35172253A US 2798846 A US2798846 A US 2798846A
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United States
Prior art keywords
wheel
electrolyte
work piece
spindle
silicon carbide
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Expired - Lifetime
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US351722A
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English (en)
Inventor
George E Comstock
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.)
Saint Gobain Abrasives Inc
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Norton Co
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Publication date
Application filed by Norton Co filed Critical Norton Co
Priority to US351722A priority Critical patent/US2798846A/en
Priority to DED17045A priority patent/DE1059271B/de
Priority to GB5417/54A priority patent/GB765101A/en
Priority to FR1104038D priority patent/FR1104038A/fr
Application granted granted Critical
Publication of US2798846A publication Critical patent/US2798846A/en
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Expired - Lifetime legal-status Critical Current

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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

Definitions

  • Figure 1 is a view partly in side elevation and partly in vertical section of an electrolytic eroding machine and a wheel therefore according to the invention
  • FIG. 2 is an enlarged elevation of the wheel spindle showing various parts thereon in cross section,'
  • Figure 3 is a diametral sectional view on an enlarged scale of the eroding wheel shown in Figure 1, the section being taken along the line 3-3 of Figure 1,
  • Figure 4 is an axial sectional view on the same scale as Figure 3 of a modified form of wheel
  • Figure 5 is a wiring diagram.
  • the machine tool may be of the type disclosed in U. S. Patent No. 2,375,619 to W. M. Bura with the special features which are appurtenant to the present invention.
  • the base supports a bed plate 11 which supports a tool holder 12 which holds the workpiece 13 which illustratively is itself a tool, for example a tool bit for use in a lathe.
  • the tips 14 of such tool bits are usually made of cemented hard carbide which is diflicult to grind but which can be ground with a diamond grinding wheel and also can be shaped by electrolytic erosin.
  • the wheel 15 may consist of a metal back plate 16 having radial grooves 17 and a metal front plate 18 with a fiat rear face so that, When the plates 16 and 18 are secured together as by means of bolts 20 the grooves 17 became channels.
  • the front plate 18 has an annular projecting portion 21 with a front face which is in a plane perpendicular to the axis of the Wheel 15 and in this portion 21' are many holes 22 extending from the front face to the grooves 17.
  • There are a plurality of holes 22 for each groove 17 preferably the same number of holes 22 for each groove 17, for example four for each as shown, and each hole 22 may be parallel to the axis of the wheel 15 as shown although holes at angles to the axis might be preferred in some cases.
  • I provide a steel spindle 25 having a straight axial bore 26 extending from its rear end nearly but not quite to the front end 27 which is threaded.
  • the spindle 25 has an enlarged diameter portion 28 having square shoulders at its ends. against this portion 28 the wheel 15 is held by means of a nut 31 on the threaded portion 27.
  • a bronze bearing sleeve 32 abuts the portion 28 and has a shoulder 33 which abuts a corresponding shoulder in an insulating sleeve 35.
  • the sleeve 35 has a flange 36 which contacts the front face of a wheel head 4% which has aligned bores for the reception of the sleeve 35 and a similar insulating sleeve 45.
  • the sleeve 45 has a flange 46 which is located in a recess in the rear face of the wheel head 40.
  • a bronze bearing sleeve 47 similar to the sleeve 32 and which has a shoulder 48 abutting a shouldered portion of the sleeve 45.
  • the spindle 25 is journalled in the bearing sleeves 32 and 47 and turns therein.
  • a pulley 53 Secured to the spindle 25 by means of a nut 50 on a threaded end 51 of the spindle 25 and by means of a key 52 is a pulley 53 connected by belts 54 to a pulley 55 of a motor 57 secured by means of screws 58 to the outside of the machine base 10.
  • a tube 60 having enlarged ends which are carefully ground and fit the bore 26 closely.
  • the left hand end of the tube 60 is threaded on the outside and is connected to a pipe elbow 65 which is connected to a pipe 66 which is supported by an insulating bracket 67 which is supported by a metal bracket 68 secured to the wheel head 41
  • the lower end of the pipe 66 is connected to a valve fitting 7 0 having a valve wheel 71 by the angular adjustment of which the flow of liquid through the valve fitting 76 can be regulated.
  • a rubber hose 73 Connected to the latter on the under side is a rubber hose 73.which is connected to a dome accumulator 74 which is mounted by means of a bracket 75 on an insulating plate 76.
  • the dome accumulator 74 is connected by a pipe 77 to a diaphragm pump 78 which is connected by a rubber pipe 79 to the bottom of a rubber tank 80 located between Walls 81 and 82 of the base 10 in the inside thereof.
  • the tank 80 can be made out of hard rubber such as the variety which is used to make the shells of electric storage batteries.
  • the pipe 79 can also be made of the same kind of hard rubber while the hose 73 can more conveniently be made of soft rubber.
  • the diaphragm pump is operated by an electric motor 84 which is attached to the insulating plate 76.
  • the diaphragm pump includes a box-like portion 85 containing the mechanical elements of the pump including an eccentric 86 and a follower 87 and this box-like portion 85 is likewise fastened to the insulating plate 7 6.
  • a characteristic of such pumps is that detritus and dirt entrained in the liquid being pumped does not rapidly wear 'out the pump because it has no piston sliding in a cylinder.
  • the rubber tank 80 contains liquid 90 which in accordance with this invention is an electrolyte.
  • Ordinary salt water can be used, for example clean ocean water can be used although in most places it will probably be more convenient to use a solution of sodium chloride in water.
  • the coolant has been water and it has been general practice to introduce a rust inhibitor into the Water. Most of these will serve as the electrolyte.
  • Particular salts which can be used in water solution to make the electrolyte with rust inhibiting characteristics are sodium nitrite, sodium chromate, potassium nitrite, potassium chromate', the amines of sodium nitrate, sodium and potassium dichromate, sodium and 2 8, x a T potassium chlorate and sodium and potassium chlorite.
  • Two good formulae are disclosed in British Patent No. 491,023 as follows:
  • Formula N0. 1 A 1% concentration in water of:
  • FIG. 1 For electrolytic erosion of a workpiece, the workpiece should be positive and the electrode as represented by the revolving wheel 15 should be negative;
  • Figure illustrates a simple circuit for achieving this result.
  • a direct current source of electricity such as a storage battery 100 has its positive terminal connected by a wire 101 to a switch 102 which is connected by a wire 103'to the bed plate 11 which of course is electrically connected to the tip 14, and the diagram so indicates. It will be readily appreciated that the bed plate 11 is electrically connected to the entire machine because it is supported by the base and so therefore in Figure 5 there is represented a.
  • I provide an insulating holder 111 secured to the front of the wheel head 40 and containing brushes 112 pressed by springs 113 against the enlarged portion 28 of the spindle 25.
  • the brushes 112 are connected, as shown in Figure 5, by wires 115 (represented by a single line in Figure 5) to a variable resistance 116 which is connected by a wire 117 and a wire 118 to the negative side of the battery 100.
  • wires 115 represented by a single line in Figure 5
  • a variable resistance 116 which is connected by a wire 117 and a wire 118 to the negative side of the battery 100.
  • the workpiece tip 14 and the wheel 15 As there is an electrolyte between the workpiece tip 14 and the wheel 15, the workpiece will be eroded and the action is quite analogous to grinding because the flat face of the front plate 18 and the revolutions of the wheel 15 cause an even erosion of the workpiece to produce, in this case, a plane surface thereon.
  • I may, as
  • a wheel eroding electrode 120 which can be a piece of cemented tungstein carbide secured to a holder 121 having a spherical portion 122 supported by a hollow spherical end 123 of a spring steel bar 124 secured by bolts 125 to an insulating bracket 126 secured by means of a bolt 127 to the machine base 10.
  • the spring steel bar 124 urges the electrode 120 against the face of the wheel 15 with light pressure.
  • this electrode 120 is shown as connected by means of a wire 128 to a variable resistance 129 which is connected by a wire 130 to the wire 118.
  • the wheel is cathode to the workpiece tip 14, it is anode to the electrode 120 which is a cathode.
  • the electrode 120 if connected and energized as shown in Figure 5, serves to true the front face of the wheel 15 to keep it in a plane. However for most operations this electrode 120 will not be needed.
  • the wheel 15a of Figure 4 comprises a metal back plate having grooves 136 and a rim 137.
  • a front plate 138 is secured to the back plate 135 by means of bolts 139 and thus the grooves 136 are channels for conducting the electrolyte.
  • the front plate 138 has a rim 140 and between the rims 137 and 140 is an annular piece 141 of recrystallized silicon carbide having an interlocking projection 142 located behind a shoulder 143 of the front plate 138.
  • This wheel of Figure 4 is mountable upon the spindle 25 and the erosion takes place by electrolytic action as already described.
  • the recrystallized piece of silicon carbide 141 is capable of doing some real abrading by conventional abrading action.
  • the electrolytic erosion removes the metal bond, usually cobalt, but probably does not erode the tungsten carbide (or tantalum carbide or titanium carbide etc.) as fast as the metal is eroded. It is therefore a help to have a true abrasive action which needs only to clear away the carbide from the surface of the workpiece.
  • Recrystallized silicon carbide was described by Francis A. Fitzgerald in U. S. Letters Patent No. 650,234 patented May 22, 1900. It is made by heating crystals of silicon carbide in proximity to each other to the temperature of recrystallization which means the temperature of further crystal growth. As a practical matter some adhesive has to be used and Fitzgerald suggests a dilute solution of glue which is mixed with grains (crushed crystals) of silicon carbide, the mixture being then pressed to the desired shape.
  • I may proceed as follows: I make a mixture of silicon carbide grains and sodium silicate solution. For example, 45% by weight of No. 20 grit size silicon carbide and 55% by weight of No. 100 grit size silicon carbide are thoroughly mixed. Then for each pound of this mixture of silicon carbide grain, I provide 14 cubic centimeters of 3 to 1 sodium silicate solution, that is to say 3 parts of water to 1 part of sodium silicate by weight.
  • a good recrystallizing temperature is 2500 C. and I can use a graphite tube furnace or an induction furnace having a graphite crucible to hold the wheel or wheels being recrystallized.
  • a satisfactory furnace is illustrated in Raymond R. Ridgways U. S. Letters Patent No. 2,125,588.
  • the pressure between the tool tip 14 and the wheel 15 can be sufiicient to cause real contact to assist in removing stock, whereas where a plane metal front plate 18 is used the pressure can be less so that the pressure of the fluid will hold the tip 14 and wheel 15 out of actual contact, thus to prolong the life of the front plate 18.
  • greater pressures can be used in the first embodiment of the invention so that actual contact is made and the electrode 120 can be relied upon for truing the face of the front plate 18.
  • the pressure between workpiece and wheel is hand pressure exerted by the operator but in many other embodiments of the invention the machine tool will have a power feed, either positive or pressure.
  • a diamond free wheel can be used, in fact the front plate 18 can be an ordinary piece of cast iron.
  • the back plate 16 is, of
  • Diamonds for industrial use are scarce and high in price and furthermore the known supply is not inexhaustable. On the contrary, at the present rate of consumption present stock piles of diamonds would be exhausted in a few years, and the present rate of consumption is far greater than the rate of finding of the diamond stones. Alluvial stones are the chief source of supply and little can be done to accelerate the discovery of stones. Consequently any development for shaping hard carbides and other hard materials without using diamonds at all is greatly to be desired.
  • the electrode 120 will having a metal front plate 18, to therefore to true the working face.
  • the machine may have the usual stop plate secured to the-bed plate 11, engageable by a template 146 secured to the tool holder 12.
  • the machine, wheel and method provide protec tion against short circuits and elimination of detrimental arcing while nevertheless permitting a high rate of cut, and when there is an urge for fast cutting the erosion can be rapid whereas when a fine finished surface is wanted the erosion can be controlled.
  • the new erosion system is self-regulating.
  • the spindle 25 is insulated from the machine tool by the insulating sleeves 35 and 45.
  • the belts 54 are made of rubber or some insulating material so no electric current can pass through them.
  • the pipe 66 is insulated by the bracket 67 while the hose 73 is made of rubber.
  • the accumulator 74, the pump '78 and the motor 84 and associated parts are insulated by the plate 76 while the pipe 79 is made of rubber and the tank 80 is also made of rubber.
  • the electrolyte is a conductor no current will be lost through it via the inside of the tube 60.
  • the method of electricflly eroding electrically conductive work pieces which comprises providing a rotating electrically conductive wheel, connecting the rotating wheel and the work piece in :an electric circuit so that the work piece is positive and the wheel is negative, flooding the wheel with liquid electrolyte, holding the work piece in the air up to the wheel where it is flooded with electrolyte to close the electric circuit and cause electric current to flow therein through the electrolyte with the work piece positive and the wheel negative, and repelling the work piece from the wheel without opening the circuit through the electrolyte by forcing the electrolyte through the wheel under hydraulic pressure to emerge from a face thereof against the work piece.
  • a machine tool comprising a wheel head, bearings in said wheel head to journal a spindle, a spindle rotatably mounted in said bearings, said spindle having a passage lengthwise thereof, means to pump electrolytic liquid to and through said passage in said spindle, an electrically conductive wheel secured to said spindle, said wheel having radial passages leading to openings in the wheel located in a circular area, electric connections to make the wheel negative, an electrically conductive support fora work piece located to hold a work piece very closely adjacent to the wheel at the circular area thereof having the openings, electric connections to make the support positive, and means to rotate the spindle and therefore to rotate the wheel, whereby to erode work pieces electrically and at the same time to restrain the work pieces from actual contact with the wheel by hydraulic pressure,
  • a machine tool as claimed in claim 2 having an insulated tank for the electrolytic liquid, the means to pump being likewise insulated and said machine tool having insulated connections from the tank to the pump and from the pump to the spindle to convey said electrolytic liquid from the tank to the Wheel, whereby the machine as a whole can be at ground potential with the wheel negatively charged avoiding any substantial current loss through the electrolytic liquid that extends from the tank through the pump to the Wheel.
  • a machine tool comprising a Wheel head, hearings in said wheel head to journal a spindle, a spindle rotatably mounted in said bearings, said spindle having a passage lengthwise thereof, an electrically conductive wheel secured to said spindle, said wheel having radial passages leading to openings in the wheel located in a circular area, an electrically conductive support for a work piece located to hold a work piece very closely adjacent to the wheel at the circular area thereof having the openings, means to pump electrolytic liquid into said spindle, said means being electrically insulated from the machine base, and electrical connections to the wheel to charge the wheel with negative electricity.
  • a machine tool comprising a wheel head, a spindle journalled in said wheel head, an electrically conductive wheel on said spindle having a circular area with openings therein, a pump and connections from the pump through the spindle to the openings in the circular area to pump electrolytic liquid through said openings, means to charge said'wheel negatively electrically, a support for a work piece locatedtohold a work piece very closely adjacent to the wheel at the circular area thereof having theopenings, and means to charge said support positively electrically relative to said wheel.
  • a machine tool as claimed in claim 5 having an insulated tank for the electrolytic liquid, the pump being likewise insulated, and having insulated connections from the tank to the pump and from the pump to the openings, whereby the machine as a whole can be at ground potential with the wheel negatively charged avoiding any substantial current loss through the electrolytic liquid that extends from the tank through the pump to the wheel.
  • a machine tool as claimed in claim 5 having in the circular area of said wheel a porous annulus the pores of which constitute said openings whereby the electrolytic liquid is pumped through the porous annulus which is part of the conductive wheel and is inset therein, said porous annulus being itself electrically conductive.
  • porous annulus is made of recrystallized silicon carbide.

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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)
US351722A 1953-04-28 1953-04-28 Method and apparatus for the electrolytic erosion of work pieces Expired - Lifetime US2798846A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US351722A US2798846A (en) 1953-04-28 1953-04-28 Method and apparatus for the electrolytic erosion of work pieces
DED17045A DE1059271B (de) 1953-04-28 1954-02-16 Verfahren und Einrichtung zum elektrolytischen Bearbeiten von Werkstuecken
GB5417/54A GB765101A (en) 1953-04-28 1954-02-24 Machine, wheel and method for the electrolytic erosion of work pieces
FR1104038D FR1104038A (fr) 1953-04-28 1954-04-15 Meule, machine et procédé pour l'érosion de pièces par voie électrolytique

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US351722A US2798846A (en) 1953-04-28 1953-04-28 Method and apparatus for the electrolytic erosion of work pieces

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DE (1) DE1059271B (fr)
FR (1) FR1104038A (fr)
GB (1) GB765101A (fr)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2939825A (en) * 1956-04-09 1960-06-07 Cleveland Twist Drill Co Sharpening, shaping and finishing of electrically conductive materials
US2946731A (en) * 1956-11-13 1960-07-26 Standard Electrical Tool Compa Method and apparatus for electrolytic shaping
US3051638A (en) * 1959-03-12 1962-08-28 United States Steel Corp Method and apparatus for making a tapered thread
US3056734A (en) * 1959-03-12 1962-10-02 United States Steel Corp Method of making a straight thread
US3058895A (en) * 1958-11-10 1962-10-16 Anocut Eng Co Electrolytic shaping
US3060114A (en) * 1958-02-06 1962-10-23 William J Barry Apparatus for cutting and machining metals electrochemically
US3061529A (en) * 1959-04-06 1962-10-30 Norton Co Electrolytic grinder and method of grinding
US3078219A (en) * 1958-11-03 1963-02-19 Westinghouse Electric Corp Surface treatment of silicon carbide
US3103482A (en) * 1963-09-10 figure
US3115454A (en) * 1961-01-03 1963-12-24 Hammond Machinery Builders Inc Electrolytic grinding machine
US3130138A (en) * 1959-11-27 1964-04-21 Battelle Development Corp Electrolytic cutting
US3194751A (en) * 1961-09-01 1965-07-13 Ex Cell O Corp Electrolytic grinder wheel
US3214360A (en) * 1960-06-21 1965-10-26 Anocut Eng Co Electrolytic cavity sinking apparatus
US3238114A (en) * 1960-06-06 1966-03-01 Gen Electric Cathode for electrolytic erosion of metal
US3338808A (en) * 1963-12-11 1967-08-29 Gen Motors Corp Method and apparatus for electrical stock removal
US3395092A (en) * 1965-05-24 1968-07-30 Ribes Vincent Dressing apparatus for diamond wheels
US3442784A (en) * 1964-05-16 1969-05-06 Supfina Wieck & Hentzen Apparatus for electrolytically honing the exterior surface of a cylindrical workpiece
US3444070A (en) * 1958-11-10 1969-05-13 Anocut Eng Co Electrolytic shaping apparatus
US3476676A (en) * 1963-12-11 1969-11-04 Gen Motors Corp Electrical stock removal cutting tool electrode

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3276988A (en) * 1959-10-06 1966-10-04 Anocut Eng Co Electrolytic removal of work material
US4405421A (en) 1980-02-22 1983-09-20 Inoue-Japax Research Incorporated Method of and apparatus for electrochemically grinding a conductive workpiece

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US387467A (en) * 1888-08-07 Water
GB189918643A (en) * 1899-09-15 1900-08-18 Frederick Hall Snyder Improvements relating to the Amalgamation and Coating of Metals or Alloys of Metals, with Metals or Alloys of Metals, by the Aid of Electricity, and to Apparatus therefor.
GB191216475A (en) * 1912-07-15 1913-07-10 George Philip Malcolm Lee Improvements in Anodes for use in Electrolytic Apparatus.
US1095893A (en) * 1911-09-13 1914-05-05 Clarence P Landreth Process of and apparatus for treating water.
US2142512A (en) * 1934-11-24 1939-01-03 Hartel Ernest Gordon Electrolytic etching machine
US2385198A (en) * 1942-02-06 1945-09-18 Carboloy Company Inc Method for forming drawing holes in carbide die nibs
US2433018A (en) * 1944-11-07 1947-12-23 Ronay Bela Adjustable electrode holder
US2526423A (en) * 1947-04-10 1950-10-17 Rudorff Dagobert William Apparatus and method for cutting materials
US2532907A (en) * 1946-09-18 1950-12-05 Clarence W Hangosky Method and apparatus for electrolytically treating metal surfaces
US2718581A (en) * 1952-04-25 1955-09-20 Clinton Machine Company Mechanism for disintegrating metals by an electric arc

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Publication number Priority date Publication date Assignee Title
DE486635C (de) * 1929-11-22 Herbert Lindner Vorrichtung zum Zufuehren von Kuehlwasser durch die Poren der Schleifscheibe
FR334038A (fr) * 1903-07-21 1903-12-09 St Louis Plate Glass Company Perfectionnements aux appareils à meuler ou à polir
DE707628C (de) * 1937-02-05 1941-06-27 Ver Deutscher Werkzeugmaschine Vorrichtung zum Zufuehren von Kuehl-, Schmier- und Spuelfluessigkeit an Werkzeugmaschinen mit umlaufenden Werkzeugen
GB509304A (en) * 1937-11-03 1939-07-10 Heald Machine Co Improvements in or relating to grinding or abrading machines
GB604056A (en) * 1944-11-27 1948-06-28 Kjeld Tue Grubb Improvements in the electrolytic polishing of metallic surfaces

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US387467A (en) * 1888-08-07 Water
GB189918643A (en) * 1899-09-15 1900-08-18 Frederick Hall Snyder Improvements relating to the Amalgamation and Coating of Metals or Alloys of Metals, with Metals or Alloys of Metals, by the Aid of Electricity, and to Apparatus therefor.
US1095893A (en) * 1911-09-13 1914-05-05 Clarence P Landreth Process of and apparatus for treating water.
GB191216475A (en) * 1912-07-15 1913-07-10 George Philip Malcolm Lee Improvements in Anodes for use in Electrolytic Apparatus.
US2142512A (en) * 1934-11-24 1939-01-03 Hartel Ernest Gordon Electrolytic etching machine
US2385198A (en) * 1942-02-06 1945-09-18 Carboloy Company Inc Method for forming drawing holes in carbide die nibs
US2433018A (en) * 1944-11-07 1947-12-23 Ronay Bela Adjustable electrode holder
US2532907A (en) * 1946-09-18 1950-12-05 Clarence W Hangosky Method and apparatus for electrolytically treating metal surfaces
US2526423A (en) * 1947-04-10 1950-10-17 Rudorff Dagobert William Apparatus and method for cutting materials
US2718581A (en) * 1952-04-25 1955-09-20 Clinton Machine Company Mechanism for disintegrating metals by an electric arc

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3103482A (en) * 1963-09-10 figure
US2939825A (en) * 1956-04-09 1960-06-07 Cleveland Twist Drill Co Sharpening, shaping and finishing of electrically conductive materials
US2946731A (en) * 1956-11-13 1960-07-26 Standard Electrical Tool Compa Method and apparatus for electrolytic shaping
US3060114A (en) * 1958-02-06 1962-10-23 William J Barry Apparatus for cutting and machining metals electrochemically
US3078219A (en) * 1958-11-03 1963-02-19 Westinghouse Electric Corp Surface treatment of silicon carbide
US3058895A (en) * 1958-11-10 1962-10-16 Anocut Eng Co Electrolytic shaping
US3444070A (en) * 1958-11-10 1969-05-13 Anocut Eng Co Electrolytic shaping apparatus
US3056734A (en) * 1959-03-12 1962-10-02 United States Steel Corp Method of making a straight thread
US3051638A (en) * 1959-03-12 1962-08-28 United States Steel Corp Method and apparatus for making a tapered thread
US3061529A (en) * 1959-04-06 1962-10-30 Norton Co Electrolytic grinder and method of grinding
US3130138A (en) * 1959-11-27 1964-04-21 Battelle Development Corp Electrolytic cutting
US3238114A (en) * 1960-06-06 1966-03-01 Gen Electric Cathode for electrolytic erosion of metal
US3214360A (en) * 1960-06-21 1965-10-26 Anocut Eng Co Electrolytic cavity sinking apparatus
US3115454A (en) * 1961-01-03 1963-12-24 Hammond Machinery Builders Inc Electrolytic grinding machine
US3194751A (en) * 1961-09-01 1965-07-13 Ex Cell O Corp Electrolytic grinder wheel
US3338808A (en) * 1963-12-11 1967-08-29 Gen Motors Corp Method and apparatus for electrical stock removal
US3476676A (en) * 1963-12-11 1969-11-04 Gen Motors Corp Electrical stock removal cutting tool electrode
US3442784A (en) * 1964-05-16 1969-05-06 Supfina Wieck & Hentzen Apparatus for electrolytically honing the exterior surface of a cylindrical workpiece
US3395092A (en) * 1965-05-24 1968-07-30 Ribes Vincent Dressing apparatus for diamond wheels

Also Published As

Publication number Publication date
DE1059271B (de) 1959-06-11
FR1104038A (fr) 1955-11-15
GB765101A (en) 1957-01-02

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