US3115454A - Electrolytic grinding machine - Google Patents

Electrolytic grinding machine Download PDF

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Publication number
US3115454A
US3115454A US80378A US8037861A US3115454A US 3115454 A US3115454 A US 3115454A US 80378 A US80378 A US 80378A US 8037861 A US8037861 A US 8037861A US 3115454 A US3115454 A US 3115454A
Authority
US
United States
Prior art keywords
spindle
section
bearing
end section
housing
Prior art date
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
Application number
US80378A
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English (en)
Inventor
Philip J Robischung
Donald E Sutton
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.)
Hammond Machinery Builders Inc
Original Assignee
Hammond Machinery Builders Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hammond Machinery Builders Inc filed Critical Hammond Machinery Builders Inc
Priority to US80378A priority Critical patent/US3115454A/en
Priority to GB44690/61A priority patent/GB928706A/en
Priority to FR883138A priority patent/FR1309596A/fr
Priority to CH1462A priority patent/CH395377A/de
Application granted granted Critical
Publication of US3115454A publication Critical patent/US3115454A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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

  • This invention relates to an electro-decomposition, metal-removal machine and it relates particularly to means for supplying an electric potential of constant polarity to the spindle of such a machine wherein said spindle also carries the armature of an induction-type, driving motor.
  • the objects of the invention include the following:
  • spindle support and drive mechanism adaptable for driving an electrical cutting tool, such as a "ice grinding wheel used in electrolytic grinding wherein said spindle carries the armature of the driving motor and wherein means are provided for applying a DC. potential to the spindle at a point between the motor bearings and electrically insulated from the field windings.
  • FIGURE 1 is an end, elevational view of the spindle and motor unit embodying the invention.
  • FIGURE 2 is a sectional view taken on the line IIH of FIGURE 1.
  • the invention comprises placing a brush and slip ring assembly within a suitable extension of one of the end bells of the motor housing between the bearing carried by said end bell and the field windings.
  • An insulating ring is placed between each end bell and an adjacent end of the cylinder defining the central part of the motor housing within which the field windings of the motor are mounted.
  • a motor housing comprising a pair of end bells 2 and 3 and a central cylindrical casing 4 located between said end bells and secured thereto.
  • Rings 5 and 10 of electrical insulating material insulate the end bells 2 and 3 from the casing 4.
  • a plurality of field windings 6 for the usual introduction type or squirrel-cage motor are mounted on and within the casing 4.
  • the casing 4 will ordinarily be grounded for protection of the operator.
  • the rings 5 and serve to insulate the A.C. potential on the field windings from the DC). potential applied on the end bells 2 and 3 as hereinafter described, and serve to insulate said end bells from the ground connection provided by the casing 4.
  • the end bell 2 includes a section 7 which is substantially cylindrical and preferably of the same outside diameter as that of the cylindrical casing 4. Said portion 7 is connected by a radially arranged wall 8 to a further cylindrical section 9 within which are mounted suitable bearings, here the ball bearing units 11 and 12. Sealing means 13 of any convenient type, here shown as being of the interfitting flange and groove type, are provided at the outboard end of the section 9 to prevent entry of grinding fluid and/ or grinding dust into the above mentioned bearings.
  • the end hell 3 comprises a generally cylindrical section 14 generally similar to the section 7 of the end bell 2 but being of somewhat greater axial length. Further, the section .14 has three radially extending tubular openings 16, 16a and 16b therein (FIGURE 1). Said end bell 3 also has a radial wall 17 connecting the cylindrical section 14 with a further cylindrical section 18 of reduced diameter. Bearing means 19, here a ball bearing assembly, is supported within section 18. An insulating sleeve 21 surrounds the bearing means 19 and insulates same from the end bell 3. This prevents flow of current (bypassing the hereinafter-menti-oned brush and slip ring assembly) through the bearing means which might otherwise cause etching of the bearing balls and/ or the races and thereby destroy the bearing.
  • a rotor 25 is disposed within the field windings 6 in the manner customary for induction motors so that energization of said field windings will eflect rotation of said rotor.
  • the rotor 25 has a spindle 26 secured thereto and extending therethrough and beyond both axial ends thereof. One end portion of the spindle 26 extends through and is supported by the bearings 11 and 12 while the other end portion extends through and is supported by the bearing 19. Grinding wheels 27 and 28 are mounted on the respective axial ends of the spindle 26.
  • the spindle 26 and rotor 25 serve as the armature of the motor which includes the field windings 6. Thus, energization of the field windings will rotate the spindle 26 and thereby rotate the grinding wheels 27 and 28.
  • An electrically conductive slip ring 31 is secured to the spindle 26- and is located within the section 14 between the bearing 19 and the adjacent end of field winding 6.
  • Brush units 32, 32a and 32b are disposed in the radial openings 16, 16a and 16b, respectively. Since the brush units are substantially identical, only unit 32, which is disposed in opening 16, will be described in detail herein. It will be understood that this description applies also to the other brush units.
  • Brush unit 32 includes a brush 33 slidable within opening 16 and having an arcuate inner edge slidably engageable with the periphery of slip ring 31.
  • a conductor 34 is secured to the brush 33 and extends outwardly through a central opening in the plug 36.
  • a spring 37 surrounds the conductor 34 and bears at its inner end against the outer edge of brush 33 to continuously urge same against the slip ring 31. The outer end of spring 37 bears against a shoulder within the plug 36.
  • the conductors 34 and 34a of the brush units 32 and 32a are connected to a terminal post 41.
  • the negative side of a source of DC. potential is connectible to the post 41 while the positive side thereof is connectible to the workpieces as is conventional in electrolytic grinding procedures.
  • the brush units 32 and 320 are intended to supply electrical potential for the spindle 26 and thereby to the grinding wheels 27 and 28.
  • the conductor 34b of the brush unit 32b is connected to a terminal post 42.
  • a conductor may connect the post 42 to the electric current control unit (not shown) which controls the amperage flowing through the spindle so that the proper amperage will flow through the spindle, all in accordance with conventional electrolytic grinding practice.
  • A.C. potential applied to the field windings 6 will eifect rotation of the spindle 26 and thereby rotation of the grinding wheels 27 and 28.
  • Electrical energy supplied to post 41 will travel through conductors 34 and 34a, thence through brushes 33 and 33a, the slip ring 31 and the spindle 26 to the grinding wheels 27 and 28.
  • the insulating rings 5 and '10 isolate the end bells 2 and 3 from the casing 4 so that the A.C. potential applied to windings 6 will be isolated trom the D0 which is applied to the end bells and further, prevents the A.C. potential applied to the field windings, which is usually 220 or 440 v.
  • Apparatus for removing metal by an electrolytic process comprising:
  • an electric motor including an intermediate housing section having a stator mounted therein;
  • first housing end section having a bearing mounted therein, first insulation means between said first housing end section and said intermediate housing section, said first end section being fixed to but electrically insulated from said intermediate section, said spindle being rotatably supported adjacent one end thereof by said bearing and extending through and beyond said first end section;
  • a second housing end section having a second bearing mounted therein, second insulation means between said second housing end section and said intermediate housing section, third insulation means between said second housing end section and said second bearing, said second end section being fixed to but electrically insulated from said intermediate section, said spindle being rotatably supported adjacent its other end by said second bearing and extending through and beyond said second end section;
  • slip ring being electrically connected to said spindle but being free of electrical connection to the windings of said motor
  • a brush mounted in said second end section and means urging same into sliding contact with said slip ring;
  • An apparatus for removing metal by an electrolytic grinding process comprising:
  • stator and a rotor mounted within said casing, said rotor having an electrically conductive spindle connected thereto, said spindle extending through said end bells;
  • one of said end bells having a hollow, axially elongated section adjacent to one end of said casing and located between said casing and the bearing in said one end bell;
  • an electrically conductive slip ring mounted on said spindle and located within said hollow section of said one end bell and axially inwardly of said bearing therein;
  • said hollow section having an openin therethrough and a brush mounted Within said opening and slidably engaging said slip ring whereby said brush means can supply electrical potential to said slip ring and thereby to said spindle;

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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)
  • Motor Or Generator Frames (AREA)
US80378A 1961-01-03 1961-01-03 Electrolytic grinding machine Expired - Lifetime US3115454A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US80378A US3115454A (en) 1961-01-03 1961-01-03 Electrolytic grinding machine
GB44690/61A GB928706A (en) 1961-01-03 1961-12-13 Electrolytic grinding apparatus
FR883138A FR1309596A (fr) 1961-01-03 1961-12-27 Machine pour enlèvement de métal par électro-dissolution
CH1462A CH395377A (de) 1961-01-03 1962-01-03 Elektrolytische Metallbearbeitungsmaschine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US80378A US3115454A (en) 1961-01-03 1961-01-03 Electrolytic grinding machine

Publications (1)

Publication Number Publication Date
US3115454A true US3115454A (en) 1963-12-24

Family

ID=22157002

Family Applications (1)

Application Number Title Priority Date Filing Date
US80378A Expired - Lifetime US3115454A (en) 1961-01-03 1961-01-03 Electrolytic grinding machine

Country Status (3)

Country Link
US (1) US3115454A (de)
CH (1) CH395377A (de)
GB (1) GB928706A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3479479A (en) * 1966-06-20 1969-11-18 Oconnor Thomas John Quick-change tool for spark cutting apparatus
US4091255A (en) * 1975-03-25 1978-05-23 Sanki Kogyo Kabushiki Kaisha Electrodes in welding machines
US4608477A (en) * 1983-03-08 1986-08-26 The United States Of America As Represented By The United States Department Of Energy Electric arc saw apparatus
US20100320078A1 (en) * 2009-06-19 2010-12-23 Renwei Yuan Electroerosion spindle assembly
US20170087655A1 (en) * 2015-09-24 2017-03-30 Agie Charmilles Sa Device and method for multichannel edm

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2514693A (en) * 1944-06-21 1950-07-11 Garrett Corp Motor assembly with magnetic brake
US2526423A (en) * 1947-04-10 1950-10-17 Rudorff Dagobert William Apparatus and method for cutting materials
US2798846A (en) * 1953-04-28 1957-07-09 Norton Co Method and apparatus for the electrolytic erosion of work pieces
US2946731A (en) * 1956-11-13 1960-07-26 Standard Electrical Tool Compa Method and apparatus for electrolytic shaping

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2514693A (en) * 1944-06-21 1950-07-11 Garrett Corp Motor assembly with magnetic brake
US2526423A (en) * 1947-04-10 1950-10-17 Rudorff Dagobert William Apparatus and method for cutting materials
US2798846A (en) * 1953-04-28 1957-07-09 Norton Co Method and apparatus for the electrolytic erosion of work pieces
US2946731A (en) * 1956-11-13 1960-07-26 Standard Electrical Tool Compa Method and apparatus for electrolytic shaping

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3479479A (en) * 1966-06-20 1969-11-18 Oconnor Thomas John Quick-change tool for spark cutting apparatus
US4091255A (en) * 1975-03-25 1978-05-23 Sanki Kogyo Kabushiki Kaisha Electrodes in welding machines
US4608477A (en) * 1983-03-08 1986-08-26 The United States Of America As Represented By The United States Department Of Energy Electric arc saw apparatus
US20100320078A1 (en) * 2009-06-19 2010-12-23 Renwei Yuan Electroerosion spindle assembly
US20170087655A1 (en) * 2015-09-24 2017-03-30 Agie Charmilles Sa Device and method for multichannel edm

Also Published As

Publication number Publication date
CH395377A (de) 1965-07-15
GB928706A (en) 1963-06-12

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