US3699728A - Method and apparatus for internal plunge grinding - Google Patents

Method and apparatus for internal plunge grinding Download PDF

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Publication number
US3699728A
US3699728A US48355A US3699728DA US3699728A US 3699728 A US3699728 A US 3699728A US 48355 A US48355 A US 48355A US 3699728D A US3699728D A US 3699728DA US 3699728 A US3699728 A US 3699728A
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United States
Prior art keywords
grinding wheel
grinding
wheel member
liquid
internally
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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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US48355A
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English (en)
Inventor
Dante S Giardini
Indarmohan S Chhabra
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.)
SHEFFIELD MACHINE TOOL COMPANY A CORP OF OH
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Bendix Corp
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Assigned to SHEFFIELD MACHINE TOOL COMPANY; A CORP OF OH. reassignment SHEFFIELD MACHINE TOOL COMPANY; A CORP OF OH. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: BENDIX CORPORATION THE
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/02—Equipment for cooling the grinding surfaces, e.g. devices for feeding coolant

Definitions

  • the apparatus for accomplishing this includes a jet wheel lubricator that saturates the porous grinding wheel with a liquid to a sufficient depth that centrifugal migration back to the surface of the grinding wheel insures substantially complete void occlusion at the surface of the grinding wheel throughout the grind zone.
  • FIG. I is a perspective view of an internal form grinding arrangement according to the present invention.
  • FIG. 2 is a perspective view of the apparatus shown in FIG. I from another direction with the workpiece withdrawn.
  • FIG. 3 is a partial view of a section taken along the line 3-3 in FIG. 2 showing the jet wheel cleaner in detail.
  • FIG. 4 is a view of the section taken along the line 4-4 in FIG. 3.
  • FIG. 5 is a diagrammatic view of the coolant and lubricant distribution occurring during the grinding operation.
  • FIG. 6 is a sectional view of an internally lubricated wheel according to the present invention together with a schematic representation of the lubricant supply circuit
  • FIG. 7 is a diagrarmnatic representation of the coolant and lubricant distribution during an internal grinding operation utilizing the internally lubricated grinding wheel of FIG. 7.
  • an internal plunge grinding apparatus 10 is shown.
  • This includes a wheel head 12, to which a conventional porous aluminum oxide form grinding wheel 14 is secured and is rotated by a motor (not shown) in the conventional manner.
  • the wheelhead 12 is mounted on a carriage 16 which in turn is mounted and controllably driven to move into the workpiece I8 laterally as indicated in FIG. 2 in order to create the plunging feed characteristic of this type of grinding operation.
  • the workpiece 18 is secured to the wheelhead 20 with two spacers 21 utilized to provide axial clearance for the wheel head 12, which is also rotated in the conventional manner, and supported on a carriage 22 so as to be retracted and extended into the proper position with respect to the form grinding wheel 14.
  • the form grinding wheel 14 is dressed by means of a crush roller 24 (FIG. 2) into which it is advanced by the carriage l6 feed mechanism with the workpiece retracted, and then slowly rotated to true the form profile after a number of grinding cycles, in the manner known to those skilled in the art.
  • a crush roller 24 FIG. 2
  • the arrangement for cooling includes a pair of nozzles 26 and 28 arranged to direct coolant towards the grind zone, with a pump (not shown) supplying filtered coolant, which for a typical application would be at the rate of 10-15 gpm at 30 psi to each nozzle.
  • This arrangement serves primarily to carry off the heat generated by the grinding process, and hence prevent the heat build-up in the workpiece from reaching bannful levels.
  • refrigerating equipment may be utilized to cool the circulated coolant.
  • the jet wheel lubricator assembly 30 is provided in this embodiment in order to accomplish the occlusion of the grinding wheel surface voids as described above.
  • rust inhibitor, or other similar liquid from a source 38, via supply hose, 39, and directs it through orifices 40 in each orifice assembly 34, 36 normally towards the surface of the grinding wheel 14.
  • the nozzle member 32 is carried by a cylinder body 42 and slidable therein so that a power cylinder (not shown) acting on the high pressure supply hose 39 can cyclically move the noule member 32 to and fro across the surface of the wheel.
  • the frequency should be selected so that the pores or voids at each point are resaturated before centrifugal force causes complete elimination of the lubricant therefrom.
  • the cylinder body 42 is rotatably carried in the carriage frame 16, and due to the eccentric location of the nozzle member 32 therein, the knurled end plates 44, 46 fixed to the cylinder body 42 may be manipulated to relocate the orifice opening 40 spacing from the surface of the grinding wheel 14 as its diameter is reduced.
  • the hose 39 is clamped against rotation so that the orifice assemblies 34, 36 will always be directed toward the grinding wheel throughout the range of adjustment.
  • the proper supply pressure will vary from 4,000 to 10,000 psi depending on the orifice sizes, wheel speed, nozzle frequency, and other factors, but the flow volume and pressure must be sufficient to saturate the wheel voids to a sufiicient depth so that as each wheel surface portion passes into the grind zone, centrifugal force will not have been able to cause all of the lubricant to pass out of the wheel, and all of the wheel voids at the surface will remain wet or occluded with lubricant throughout. This is represented in the exaggerated shaded area of FIG. 5.
  • intricate forms such as that depicted at 48 in P16. 1, may be plunge ground, and materials such as titanium and stainless steel have been internally form ground, successfully replacing machining procedures taking many times the length of time required for this process while improving surface finishes and tolerance levels.
  • the occlusion was obtained by forcing lubricant into the wheel via a jet stream, with the centrifugal action then causing a steady flow back to the surface.
  • the lubricant is supplied internally and allowed to migrate outwardly to produce the same effect of void occlusion at the grinding wheel surface.
  • the internally lubricated grinding wheel assembly 50 includes an annular grinding wheel 52 which is retained between a pair of hub members 53, 56 cooperating with tapered shoulders 58, 60 on the grinding wheel and clamped between a pair of paper washers 62, 64.
  • the hub members 54, 56 are secured together with a plurality of machine screws 66.
  • each of the oil rings 68 and 70 is provided with a series of evenly spaced oil pockets 72, 74, each aligned with respective passages 76, 78 in each hub member.
  • the s a 76 and 78 communicate with an annular chamber 80 formed by the radial clearance between the grinding wheel 52 and the hub member 56.
  • Each of the passages 76 and 78 has a respective metering orifice 79 and 81 to control the amount of liquid flow therethrough for a given pressure differential.
  • a pair of distributor tubes 82 and 84 are disposed so as to direct fluid from source 86 into the oil pockets 72 and 74.
  • the lubricant should be circulated through filter 88 before being directed therefrom to avoid clogging of the grinding wheel voids.
  • the lubricant then enters the passages 76 and 78, being acted upon by the centrifugal force created by rotation of the assembly 50, moving into the chamber 80. From thence, it migrates outwardly by the action of centrifugal force through the interstices of the annular grinding wheel 52, ultimately emerging at the surface.
  • the grinding wheel assembly 52 is dead shaft mounted. That is, the supporting stub shaft 90 is fixed to the wheelhead 92, while the hub member 56 is secured to a hollow drum member 94, which is in turn rotatably mounted ori the stub shaft 90 via bearings 96, 98, and may be belt driven at the surface 100.
  • This construction allows the distributor tube 82 to be supplied via central passage 102 bored in the stub shaft 90 from the same side of the grinding wheel assembly 52 as distributor tube 84. Hence, blind" mounting arrangements for internal surfaces may be successfully carried out.
  • the internally lubricated grinding wheel assembly 50 is used in conjunction with coolant supply devices 104 and 106 (HO. 7) directing relatively large volumes of coolant towards the grind zone to perform the cooling function, while the flow internally is adjusted by proper selection of orifice sizes 82 and 84 to just wet the surface of the grinding wheel 52 under the operating conditions.
  • coolant supply devices 104 and 106 HO. 7
  • FIGS. 6-7 While the internally lubricated grinding wheel of FIGS. 6-7 is particularly suitable for carrying out void occlusion according to the present invention, it also exhibits a substantial advantage for general grinding use:
  • An internally lubricated grinding wheel arrangement for a grinding machine comprising:
  • lubricating means for supplying a liquid internally to said grinding wheel member to produce outward migration of said liquid through said grinding wheel member voids and including a circumferentially extending internal chamber in said grinding wheel member and means for directing said liquid into said chamber;
  • cooling means for directing a coolant supply externally of said grinding wheel member to the grinding zone, whereby said grinding wheel is lubricated by internal liquid flow, while being cooled by external liquid flow.
  • An internally lubricated grinding wheel arrangement for a grinding machine comprising:
  • lubricating means for supplying a liquid internally to said grinding wheel member to produce outward migration of said liquid through said grinding wheel member voids including metering means having a plurality of pockets arranged circumferentially about said grinding wheel member and further including an internal circumferential passage having a radially outer surface defined at least in part by a portion of said grinding wheel member, and also including passage means providing a fluid connection between each of said pockets and said chamber; and
  • cooling means for directing a coolant supply externally of said grinding wheel member to the grinding zone, whereby said grinding wheel is lubricated by internal liquid flow, while being cooled by external liquid flow.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Auxiliary Devices For Machine Tools (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
US48355A 1970-06-22 1970-06-22 Method and apparatus for internal plunge grinding Expired - Lifetime US3699728A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US4835570A 1970-06-22 1970-06-22

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US3699728A true US3699728A (en) 1972-10-24

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US48355A Expired - Lifetime US3699728A (en) 1970-06-22 1970-06-22 Method and apparatus for internal plunge grinding

Country Status (5)

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US (1) US3699728A (cs)
JP (1) JPS549358B1 (cs)
CA (1) CA931762A (cs)
DE (1) DE2130897C3 (cs)
GB (1) GB1360014A (cs)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3328552A (en) * 1966-04-04 1967-06-27 Square D Co Electric switching device
RU2142875C1 (ru) * 1997-10-21 1999-12-20 Ульяновский государственный технический университет Способ шлифования отверстия в цилиндрической детали

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2038203A (en) * 1978-12-13 1980-07-23 Voith Gmbh J M Wood pulp grinding apparatus

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US500561A (en) * 1893-07-04 Emery-wheel
US796466A (en) * 1904-07-18 1905-08-08 Georg Stolzenberg Grindstone.
US1241236A (en) * 1915-06-08 1917-09-25 Maurice Mathy Machine for grinding the rims of glass vessels.
US1396123A (en) * 1920-08-07 1921-11-08 B L Schmidt Company Internal-grinding machine
US1482855A (en) * 1921-02-03 1924-02-05 Greenfield Tap & Die Corp Mechanism for supplying liquid to grinding machines
US1539742A (en) * 1923-05-15 1925-05-26 Micro Machine Company Method of grinding
US1832104A (en) * 1928-02-13 1931-11-17 Greenfield Tap & Die Corp Internal grinding machine
US2000288A (en) * 1929-01-15 1935-05-07 Gen Motors Corp Bore cutting machine
US2560944A (en) * 1948-07-08 1951-07-17 Oliver Instr Company Cooling system and apparatus for abrasive wheels
US2914892A (en) * 1956-12-28 1959-12-01 Fouquet Eugene Process and arrangements for simultaneous lubrication and cooling of the piece of work and the cutting tools during machining operations
US3123950A (en) * 1964-03-10 Ultrasonic cleaning of grinding wheels
US3167893A (en) * 1962-11-05 1965-02-02 Sheffield Corp Apparatus for cleaning grinding wheels
US3417517A (en) * 1965-12-14 1968-12-24 Howard E. Rose Grinding apparatus
US3543451A (en) * 1967-10-26 1970-12-01 Day Ton Progress Corp Accessory for machine tools

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3123950A (en) * 1964-03-10 Ultrasonic cleaning of grinding wheels
US500561A (en) * 1893-07-04 Emery-wheel
US796466A (en) * 1904-07-18 1905-08-08 Georg Stolzenberg Grindstone.
US1241236A (en) * 1915-06-08 1917-09-25 Maurice Mathy Machine for grinding the rims of glass vessels.
US1396123A (en) * 1920-08-07 1921-11-08 B L Schmidt Company Internal-grinding machine
US1482855A (en) * 1921-02-03 1924-02-05 Greenfield Tap & Die Corp Mechanism for supplying liquid to grinding machines
US1539742A (en) * 1923-05-15 1925-05-26 Micro Machine Company Method of grinding
US1832104A (en) * 1928-02-13 1931-11-17 Greenfield Tap & Die Corp Internal grinding machine
US2000288A (en) * 1929-01-15 1935-05-07 Gen Motors Corp Bore cutting machine
US2560944A (en) * 1948-07-08 1951-07-17 Oliver Instr Company Cooling system and apparatus for abrasive wheels
US2914892A (en) * 1956-12-28 1959-12-01 Fouquet Eugene Process and arrangements for simultaneous lubrication and cooling of the piece of work and the cutting tools during machining operations
US3167893A (en) * 1962-11-05 1965-02-02 Sheffield Corp Apparatus for cleaning grinding wheels
US3417517A (en) * 1965-12-14 1968-12-24 Howard E. Rose Grinding apparatus
US3543451A (en) * 1967-10-26 1970-12-01 Day Ton Progress Corp Accessory for machine tools

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3328552A (en) * 1966-04-04 1967-06-27 Square D Co Electric switching device
RU2142875C1 (ru) * 1997-10-21 1999-12-20 Ульяновский государственный технический университет Способ шлифования отверстия в цилиндрической детали

Also Published As

Publication number Publication date
JPS549358B1 (cs) 1979-04-24
DE2130897B2 (de) 1979-09-20
DE2130897A1 (de) 1971-12-30
DE2130897C3 (de) 1980-05-22
GB1360014A (en) 1974-07-17
CA931762A (en) 1973-08-14

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AS Assignment

Owner name: SHEFFIELD MACHINE TOOL COMPANY; A CORP OF OH., OHI

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:BENDIX CORPORATION THE;REEL/FRAME:004044/0681

Effective date: 19820730

Owner name: SHEFFIELD MACHINE TOOL COMPANY; 3913 WILLOW CREEK

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:BENDIX CORPORATION THE;REEL/FRAME:004044/0681

Effective date: 19820730