US3568377A - Device for cooling and cleaning of grinding wheels - Google Patents

Device for cooling and cleaning of grinding wheels Download PDF

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Publication number
US3568377A
US3568377A US788366A US3568377DA US3568377A US 3568377 A US3568377 A US 3568377A US 788366 A US788366 A US 788366A US 3568377D A US3568377D A US 3568377DA US 3568377 A US3568377 A US 3568377A
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Prior art keywords
grinding
grinding wheel
nozzles
fluid
cooling
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Expired - Lifetime
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US788366A
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English (en)
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Robert Blohm
Wlodzimierz Sawiuk
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Individual
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Priority claimed from DE19681652003 external-priority patent/DE1652003C3/de
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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

  • a multitude of nozzles are provided in a generally U-shaped block and adapted to discharge a jet of a high kinetic energy which impinges upon the grinding surfaces of the grinding wheel. Additional means may be provided for reducing the resistance caused by air turbulence between the nozzles and the grinding wheel.
  • This invention relates to a'device for the cooling and cleaning of grinding wheels during the grinding operation by means of pressure fluid fed through nozzles to the grinding surfaces of the grinding wheel.
  • Grinding wheels are, in a known manner, composed of a granular abrasive and a bonding material.
  • the abrasive usually consists of very hard crystals, particularly of corundum, i.e. aluminium oxide, or of carborundum which is silicon carbide, to mention only the most important ones.
  • the bonding may be based on ceramic, mineral, vegetable and plastic bonding such as by hardenable resins.
  • the sizes of the granules and the hardness and the kind of bonding determine the suitability of a grinding tool for a certain application and for working with a certain material.
  • the bonding hardness will be determined primarily in correspondence with the hardness of the material to be worked.
  • a hard material requires soft wheels so that the blunted granules may split or quickly break loose and the grinding wheel does not become clogged or smeared.
  • harder wheels may be utilized, with these, however, the hazard of the wheel becoming clogged or smeared is particularly high.
  • It is a further object of the invention to provide a device for cleaning and cooling of grinding wheels which is characterized in that the fluid may be applied through a multitude of nozzles being arranged at substantially right angles to the grinding surface whereby the fluid has a high kinetic energy and impinges on the grinding surface of the grinding wheel within an area which is positioned outside the grindng wheel area at any moment being in engagement with the workpiece.
  • the grinding wheels will persent a completely cleaned and sharp grinding surface for coming into engagement with the workpiece upon every revolution of the wheel, thus allowing the grinding of relatively large areas at a high feeding speed and depth of engagement (full grinding) without requiring dressing of the grinding wheel.
  • the invention also allows to grind soft materials over substan tially longer working periods and, additionally, the grinding of extremely soft materials such as brass or copper will be possible, hitherto not manageable by grinding.
  • a correspondingly arranged embodiment of the present invention allows to treat, ie to cool and clean, a large grinding surface by means of a relatively small number of nozzles.
  • fluid may be pressurized by known means and subsequently discharged by nozzles.
  • the fluid conduits must be shaped and arranged in such a way and include suitable baffles in order to produce spinning and turbulence by kinetic energy of the fluid, disintegrating in turn the jet due to the resulting centrifugal forces and splitting the fluid in the static ambient air due to the velocity difference, or squashing the fluid on an impact surface or the like.
  • cone-shaped nozzles as well as nozzles producing flat jets may be utilized. It is even possible to utilize a rotating sprayer or atomizer, although the added constructional complications involved generally tend to make the arrangement of the rotating nozzle atomizers appear less desirable.
  • the conversion of the fluid into mist or fog may be obtained in another manner, likewise known by itself, this manner being characterized in that the fluid is applied by means of a nozzle which discharges a pressurized gas having a high velocity and draws along the fluid in the form of droplets or in atomized condition.
  • any type of gas may be utilized, compressed air being the preferred gas because it is most readily available.
  • Any other gas particularly an inert gas such as nitrogen or carbon dioxide may be utilized.
  • the additional cooling effect provided by an expanding pressurized gas may be particularly advantageous for atomizing fluid by means of pressurized gas. In this case the fluid normally will be maintained at barometric pressure.
  • the invention is not intended to be limited to this particular arrangement.
  • the nozzle for discharging the pressurized gas and the feeding conduit for the fluid will be preferably arranged concentrically so that the fluid feeding conduit concentrically surrounds the nozzle or, inversely, a nozzle for the pressurized gas concentrically surrounds a fluid feeding conduit mounted concentrically in the interior of the nozzle, the nozzle, in the latter case, being arranged in the form of a ring channel or comprising a plurality of circularly arranged nozzles.
  • the pressuriz'ed fluid is supplied to a plurality of nozzles from a supply chamber, the nozzle axis being directed at substantially right angles to the grinding surface.
  • the diameter of each nozzle does not exceed 2 mm.
  • Nozzles of this 'kind may be considered smooth, i.e. good nozzles in the hydrodynamic sense, only a small portion of the jet discharging from the nozzle becoming atomized.
  • the pressure of the pressure fluid depends to a high degree on the diameter of the nozzle ports but also depends naturally on the hardness of the bonding, the size of the abrasive granules and the material of the workpiece. If the nozzle diameter is 1 mm., a suitable pressure of the pressure fluid would be kp./cm. It may also be preferable to apply higher pressures in the range of several hundred kp./cm. A similar advantage may be gained if the nozzle diameters are appreciably below a value of 1 mm.
  • the orifices of the nozzles should be arranged as closely as possible to the grinding surfaces 'of the grinding wheel. As a general rule, this spacing would be only 1 mm. or a few millimeters.
  • the maximum spacing of the orifices of the nozzles equals ten times the diameter of the nozzle orifices, all of the grinding surface of the wheel being substantially covered by nozzle orifices.
  • the nozzles are arranged within a block which is U-shaped, straddles the circumference of the grinding wheel and is provided with a supply chamber to which a pressure source may be connected, the supply chamber communicating with the nozzle orifices.
  • This block may be made of a solid block of a rigid material which can be readily machined such as a solid block of ingot steel.
  • a block of this type a large number of precise nozzle orifices may be most conveniently provided by means of metal cutting techniques.
  • a block of this type provides a suflicient degree of rigidity and tightness even at high pressures of the fluid medium.
  • the high speed fluid jets leaving the nozzles reach the surface of the grinding wheel quickly and in the shortest path. It has been observed that the usually rough and fissured surface of the grinding wheel rotating at high speed (the tangential velocity usually is within a range of approximately 15-45 m./sec. but may be increased in special applications up to approximately 90 m./sec.) drags along an air layer so that a considerable fraction of the fluid jet which, in accordance with the invention is directed substantially perpendicularly to the grinding surface of the wheel, will be needed for penetrating this air layer and therefore is lost for the effect desired by the present invention.
  • the tangential velocity usually is within a range of approximately 15-45 m./sec. but may be increased in special applications up to approximately 90 m./sec.
  • the present invention therefore, proposed to provide a deflector in front of each block, the deflector facing the entrance side of the grinding wheel and being mounted in such a manner that the clearance (gap) between the grinding surface of the grinding wheel and the edge of the deflector which is directed towards the grinding wheel is kept to a minimum. It may even be desirable to provide a device for removing the air along this edge of the deflector by suction with the aid of a vacuum source.
  • FIG. 1 shows a cross-sectional view through a cleaning and cooling device in accordance with the present invention, along the axis of the grinding wheel and along the line AA of FIGS. 3 and 4;
  • FIG. 2 is a top plan view of the device of FIG. 1;
  • FIG. 3 is an elevational view of the device of FIGS. 1 and 2;
  • FIG. 4 is an elevational view, similar to FIG. 3, in a reduced scale, and shows the distribution of a plurality of cleaning and cooling devices in accordance with the invention, along the larger portion of the circumference of the grinding wheel.
  • the reference 1 designates a grinding wheel rotating in the sense indicated by the arrow 17 and grinding a workpiece 14 along the cutting path w.
  • a plurality of cleaning and cooling devices are provided on the circumferential portion of the grinding wheel which lies outside the cutting path w. In the present embodiment these devices are in the form of a block designated by the reference 2.
  • the block 2 may be more clearly seen in the FIGS. 1-3.
  • five blocks 2 are provided, these blocks being evenly spaced on that circumferential portion of the grinding wheel which lies outside the cutting path w. That portion may be called the circumferential engagement area of the cleaning and cooling fluid and is indicated by the broken line 15 in FIG. 4.
  • every one of the blocks 2 has the shape of a U, the arms of which straddle thecircumference of the grinding wheel 1.
  • the crosspiece of the U-shaped block 2 is provided with a bore 3 which is open on one end and may be tightly sealed at this end by a screw 10.
  • the two arms of the U-shaped block 2 are each provided with a bore '4, 5 respectively, each of these bores being likewise tightly sealed from the outside by a screw 10.
  • the bores 4, 5 each include a right angle with the bore 3. This right angles is determined by the shape of the grinding wheel 1 and does not constitute a part of the present invention.
  • the supply chamber formed by the bores 3, 4 and 5 is supplied with pressurized cooling and cleaning fluid such as an emulsion or suspension of oil in water by means of a conduit 11.
  • pressurized cooling and cleaning fluid such as an emulsion or suspension of oil in water by means of a conduit 11.
  • the direction of the fluid entering the supply chamber is indicated by the arrow 16.
  • a multitude of nozzles 6 which are preferably evenly and as closely as is practicable, spaced, interconnect the bore 3 with the outer surface of the block facing the grinding wheel 1 and are perpendicularly arranged to this surface. These nozzles 6 are (in the manner not shown in the drawing) conically tapered so that they have the smallest cross-sectioal area at the outlet side facing the grinding wheel. Additional nozzles 6 (not shown) may be arranged in a plane perpendicular to the plane of FIG. 1 of the drawing. These additional nozzles 6 may likewise communicate with the bore 3 and are substantially at right angles to the outer surface of the block facing the grinding wheel, i.e. to the circumferential area of the same.
  • Similar nozzles 7 communicate with the bore 5 and are arranged at right angles to a lateral surface of the grinding wheel 1. These nozzles are provided in that area of the grinding wheel in which the grinding wheel is intended to be utilized for grinding. For enabling the drilling of the nozzles 7, an auxiliary bore is provided in the block, enters the bore 5 and may be tightly sealed by a threaded plug 9.
  • the bore 4 includes an auxiliary bore sealed by a threaded plug 9 and serving to facilitate drilling of the nozzles 8.
  • a deflector 13 is provided on the side of the block 2 at which the rotating wheel 1 enters the block. This deflector closely surrounds the surface of the grinding wheel 1, is attached by screws 12 to the block and has an U- shape which corresponds to the cross-sectional shape of the block.
  • the deflector 13 serves to remove as far as may be achieved all air layers which are dragged along by the rotating grinding wheel before the fluid jets discharged from the nozzles 6, 7, 8 of the block 2 impinge upon the surface of the grinding wheel.
  • the efliciency of the cleaning and cooling effect which may be achieved by the fluid jets impinging upon the surfaces of the grinding wheel will be increased if the air layer carried along by the grinding wheel can be more effectively removed or decreased.
  • Apparatus for cleaning and cooling a rotating grinding wheel having an axis of rotation, a periphery and lateral sides, during the grinding of a workpiece comprising, in combination, a manifold block having a hollow interior supported adjacent the grinding wheel periphery having an inner surface of a length at least as great as the periphery width disposed toward the wheel periphery and closely spaced therefrom, a plurality of nozzles defined in said block constituting openings intersecting said inner surface and communicating with the interior of said block, said openings being arranged in said block to be disposed across the entire wheel periphery and radially disposed relative to the grinding wheel axis of rotation as to be perpendicular to the adjacent wheel periphery, and a pressurized fluid source communicating with said manifold block interior whereby pressurized fluid within said block is ejected against the entire wheel periphery through said openings to clean and cool the grinding wheel.
  • said manifold block is of a U-shape having a base portion and leg portions, said inner surface being defined on said base portion and said leg portions each including an inner surface closely disposed to a lateral side of the grinding wheel adjacent the periphery thereof, and a plurality of nozzle openings intersecting said leg portions inner surfaces communicating with said block interior and perpendicularly disposed to the adjacent wheel lateral side.
  • an air deflector defined on said block disposed adjacent the wheel periphery and located on said block toward the direction of rotation of the grinding wheel minimizing the entering of moving air adjacent the wheel periphery between said inner surface and wheel periphery.
  • said pressurized fluid comprises a gas having particles of liquid entrained therein.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
US788366A 1968-01-09 1969-01-02 Device for cooling and cleaning of grinding wheels Expired - Lifetime US3568377A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681652003 DE1652003C3 (de) 1968-01-09 1968-01-09 Vorrichtung zum Reinigen und Kühlen von Schleifscheiben mit Flüssigkeitsstrahlen

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US3568377A true US3568377A (en) 1971-03-09

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US788366A Expired - Lifetime US3568377A (en) 1968-01-09 1969-01-02 Device for cooling and cleaning of grinding wheels

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US (1) US3568377A (ja)
CH (1) CH492519A (ja)
ES (1) ES362286A1 (ja)
FR (1) FR1600356A (ja)
GB (1) GB1225742A (ja)
SE (1) SE351587B (ja)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3812622A (en) * 1972-06-14 1974-05-28 J Parsons Sander cleaner
US4109422A (en) * 1976-04-05 1978-08-29 Parsons Enterprises, Inc. Sander cleaning process
US5605499A (en) * 1994-04-27 1997-02-25 Speedfam Company Limited Flattening method and flattening apparatus of a semiconductor device
US5727992A (en) * 1995-07-11 1998-03-17 Valmet Paperikoneet Inc. Method and apparatus for sharpening the surface of a grindstone for a pulp grinder
US5868608A (en) * 1996-08-13 1999-02-09 Lsi Logic Corporation Subsonic to supersonic and ultrasonic conditioning of a polishing pad in a chemical mechanical polishing apparatus
EP0955119A2 (en) * 1998-05-07 1999-11-10 SKC di Tondini Claudio Disk housing for electric cutter with water-cooled cutting disk
US20040005844A1 (en) * 2002-02-28 2004-01-08 Toyoda Machine Works, Ltd. Grinding method and device for the same
US20040072513A1 (en) * 2001-08-20 2004-04-15 Webster John A. Coherent jet nozzles for grinding application
US20060252356A1 (en) * 2002-07-26 2006-11-09 Webster John A Coherent jet nozzles for grinding applications
US20090197780A1 (en) * 2008-02-01 2009-08-06 Weaver Jimmie D Ultrafine Grinding of Soft Materials
US20120118278A1 (en) * 2009-03-17 2012-05-17 Husqvarna Ab Cutting machine with a liquid lubrication delivery system having a controlled liquid level
US8506355B1 (en) * 2010-01-04 2013-08-13 Applied Micro Circuits Corporation System and method for in-situ inspection during metallurgical cross-sectioning
US20150367529A1 (en) * 2014-06-24 2015-12-24 Zhijie Wang Cleaning mechanism for semiconductor singulation saws
EP2998052A1 (de) 2014-09-22 2016-03-23 Roland Geitel Verfahren und vorrichtung zur schmalflächenbeschichtung von plattenförmigen halbzeugen oder werkstücken
RU2579325C1 (ru) * 2014-11-20 2016-04-10 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Владимирский государственный университет имени Александра Григорьевича и Николая Григорьевича Столетовых" (ВлГУ) Устройство для подачи смазочно-охлаждающей жидкости при плоском периферийном шлифовании
US20180079108A1 (en) * 2015-05-01 2018-03-22 Shin-Etsu Handotai Co., Ltd. Wire saw apparatus
CN110370069A (zh) * 2019-09-03 2019-10-25 福建省龙岩市博辉建筑劳务有限公司 一种铝模板加工用冷却装置
US11054790B2 (en) * 2017-10-16 2021-07-06 The Swatch Group Research And Development Ltd Method for cutting watch crystals
US20210347009A1 (en) * 2020-05-07 2021-11-11 Disco Corporation Grinding apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10322991A1 (de) * 2003-05-21 2004-12-16 Erwin Junker Maschinenfabrik Gmbh Verfahren und Vorrichtung zum Schleifen eines Werkstücks

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3812622A (en) * 1972-06-14 1974-05-28 J Parsons Sander cleaner
US4109422A (en) * 1976-04-05 1978-08-29 Parsons Enterprises, Inc. Sander cleaning process
US5605499A (en) * 1994-04-27 1997-02-25 Speedfam Company Limited Flattening method and flattening apparatus of a semiconductor device
US5727992A (en) * 1995-07-11 1998-03-17 Valmet Paperikoneet Inc. Method and apparatus for sharpening the surface of a grindstone for a pulp grinder
US6168502B1 (en) 1996-08-13 2001-01-02 Lsi Logic Corporation Subsonic to supersonic and ultrasonic conditioning of a polishing pad in a chemical mechanical polishing apparatus
US5868608A (en) * 1996-08-13 1999-02-09 Lsi Logic Corporation Subsonic to supersonic and ultrasonic conditioning of a polishing pad in a chemical mechanical polishing apparatus
EP0955119A2 (en) * 1998-05-07 1999-11-10 SKC di Tondini Claudio Disk housing for electric cutter with water-cooled cutting disk
EP0955119A3 (en) * 1998-05-07 2001-10-10 SKC di Tondini Claudio Disk housing for electric cutter with water-cooled cutting disk
EP1547713A3 (en) * 1998-05-07 2005-11-02 S.K.C. di Tondini Claudio An electric cutter with water-cooled disk
US20040072513A1 (en) * 2001-08-20 2004-04-15 Webster John A. Coherent jet nozzles for grinding application
US7086930B2 (en) 2001-08-20 2006-08-08 Saint-Gobain Abrasives, Inc. Coherent jet nozzles for grinding application
US20040005844A1 (en) * 2002-02-28 2004-01-08 Toyoda Machine Works, Ltd. Grinding method and device for the same
US6932673B2 (en) * 2002-02-28 2005-08-23 Toyoda Koki Kabushiki Kaisha Grinding method and device for the same
US7727054B2 (en) 2002-07-26 2010-06-01 Saint-Gobain Abrasives, Inc. Coherent jet nozzles for grinding applications
US20060252356A1 (en) * 2002-07-26 2006-11-09 Webster John A Coherent jet nozzles for grinding applications
US20090197780A1 (en) * 2008-02-01 2009-08-06 Weaver Jimmie D Ultrafine Grinding of Soft Materials
US20120118278A1 (en) * 2009-03-17 2012-05-17 Husqvarna Ab Cutting machine with a liquid lubrication delivery system having a controlled liquid level
US11040464B2 (en) * 2009-03-17 2021-06-22 Husqvarna Ab Cutting machine with a liquid lubrication delivery system having a controlled liquid level
US8506355B1 (en) * 2010-01-04 2013-08-13 Applied Micro Circuits Corporation System and method for in-situ inspection during metallurgical cross-sectioning
CN105216130B (zh) * 2014-06-24 2019-04-19 恩智浦美国有限公司 用于半导体切单锯的清洁装置
US9498898B2 (en) * 2014-06-24 2016-11-22 Freescale Semiconductor,Inc. Cleaning mechanism for semiconductor singulation saws
CN105216130A (zh) * 2014-06-24 2016-01-06 飞思卡尔半导体公司 用于半导体切单锯的清洁装置
US20150367529A1 (en) * 2014-06-24 2015-12-24 Zhijie Wang Cleaning mechanism for semiconductor singulation saws
EP2998052A1 (de) 2014-09-22 2016-03-23 Roland Geitel Verfahren und vorrichtung zur schmalflächenbeschichtung von plattenförmigen halbzeugen oder werkstücken
DE102014219064A1 (de) * 2014-09-22 2016-03-24 Roland Geitel Verfahren und Vorrichtung zur Schmalflächenbeschichtung von plattenförmigen Halbzeugen oder Werkstücken
RU2579325C1 (ru) * 2014-11-20 2016-04-10 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Владимирский государственный университет имени Александра Григорьевича и Николая Григорьевича Столетовых" (ВлГУ) Устройство для подачи смазочно-охлаждающей жидкости при плоском периферийном шлифовании
US20180079108A1 (en) * 2015-05-01 2018-03-22 Shin-Etsu Handotai Co., Ltd. Wire saw apparatus
US10589446B2 (en) * 2015-05-01 2020-03-17 Shin-Etsu Handotai Co., Ltd. Wire saw apparatus
US11054790B2 (en) * 2017-10-16 2021-07-06 The Swatch Group Research And Development Ltd Method for cutting watch crystals
CN110370069A (zh) * 2019-09-03 2019-10-25 福建省龙岩市博辉建筑劳务有限公司 一种铝模板加工用冷却装置
US20210347009A1 (en) * 2020-05-07 2021-11-11 Disco Corporation Grinding apparatus

Also Published As

Publication number Publication date
FR1600356A (ja) 1970-07-20
DE1652003A1 (de) 1970-05-06
GB1225742A (ja) 1971-03-24
DE1652003B2 (de) 1976-01-08
CH492519A (de) 1970-06-30
ES362286A1 (es) 1970-12-01
SE351587B (ja) 1972-12-04

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