EP0327719B1 - Outil pour une meule ainsi que méthode d'utilisation - Google Patents

Outil pour une meule ainsi que méthode d'utilisation Download PDF

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Publication number
EP0327719B1
EP0327719B1 EP88121499A EP88121499A EP0327719B1 EP 0327719 B1 EP0327719 B1 EP 0327719B1 EP 88121499 A EP88121499 A EP 88121499A EP 88121499 A EP88121499 A EP 88121499A EP 0327719 B1 EP0327719 B1 EP 0327719B1
Authority
EP
European Patent Office
Prior art keywords
trueing
dressing
tool
wheel
diamonds
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
EP88121499A
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German (de)
English (en)
Other versions
EP0327719A1 (fr
Inventor
William Webster Ruark
Glenn A. Johnson
Joseph A. Zahorchak
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.)
General Electric Co
Original Assignee
General Electric Co
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Publication date
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Application filed by General Electric Co filed Critical General Electric Co
Priority to AT88121499T priority Critical patent/ATE75176T1/de
Publication of EP0327719A1 publication Critical patent/EP0327719A1/fr
Application granted granted Critical
Publication of EP0327719B1 publication Critical patent/EP0327719B1/fr
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Classifications

    • 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
    • B24B53/00—Devices or means for dressing or conditioning abrasive surfaces
    • B24B53/12—Dressing tools; Holders therefor
    • B24B53/14—Dressing tools equipped with rotary rollers or cutters; Holders therefor

Definitions

  • the present invention relates to a method for trueing and dressing grinding wheels and to a novel trueing and dressing tool. More particularly, the present invention relates to a method for trueing and dressing grinding wheels having vitrified-bonded cubic baron nitride (CBN) abrasive by use of a fine point trueing disc mounted between the existing headstock and tailstock of a grinding machine.
  • CBN vitrified-bonded cubic baron nitride
  • a number of grinding wheels ore known to those skilled in the art including, for example, conventional aluminum oxide and silicon carbide grinding wheels as well as resin-bonded and vitrified-banded CBN grinding wheels and diamond grinding wheels. Regardless of the type of grinding wheel, it is necessary to true and dress the grinding wheel in order that it may accurately form fine finishes or precise contours on workpieces.
  • single point trueing and dressing tools include hand set diamond and metal-bonded diamond rotary cup and straight wheel tools. While such rotary dressing tools are more effective than single point tools, they have the disadvantage of being relatively expensive, and, furthermore, they are used in conjunction with a relatively expensive electric or hydraulic precision drive motor and spindle assembly. Consequently, small machine shops are unable to avail themselves of rotary dressing technology.
  • Another disadvantage of rotary cup wheel dressing tools is the necessity of changing the position or angle of the dressing wheel in order to present new, sharper edges as the originally presented edges wear flat.
  • Straight wheel dressing tools suffer from the further disadvantage of having the abrasive applied to the circumferential surface of the wheel in a band several millimeters in width.
  • the operator has very little control over the dressed surface of the vitrified-bonded CBN grinding wheels because a wide band of abrasive, unlike a sharp point, generally leaves the wheel in a closed or dull condition. Wheels in this condition generate excessive heat, which may cause the wheel to burn the workpiece.
  • EP-A-0 116668 describes a diamond dressing wheel comprising a base body a surface of which bears a diamond coating, said diamond coating being a single layer in the direction of the rotational axis and a multilayer in a direction perpendicular to the rotational axis.
  • EP-A-0 116668 teaches a unitary construction, according to the pre-characterising part of claim 1.
  • a tool for trueing and dressing a grinding wheel comprising a wheel having a thin layer of diamonds disposed intermediate the sides of said tool in a plane perpendicular to the rotational axis of said wheel, characterized in that said wheel comprises a disc having segments, affixed to said disc, said segments containing said thin layer of diamonds.
  • the thin layer of diamonds is only a single layer of diamonds in width and is disposed inside the trueing and dressing wheel.
  • a single layer of diamonds is plated or metal-bonded to at least one side of the trueing and dressing wheel.
  • a method for trueing and dressing a grinding wheel comprising engaging the periphery of the rotating grinding wheel with a rotating trueing and dressing wheel as above disposed intermediate the headstock and tailstock of a grinding machine.
  • a tool for trueing and dressing a grinding wheel comprising a wheel having a thin layer of diamonds disposed intermediate the sides of said tool in a plane perpendicular to the rotational axis of said wheel, characterized in that said wheel comprises a disc having segments affixed to said disc, said segments containing said thin layer of diamonds.
  • the trueing and dressing tool of the present invention is especially suited for trueing and dressing large diameter vitrified-bonded CBN grinding wheels, it may also be used effectively and efficiently on conventional grinding wheels such as, for example, aluminum oxide and silicon carbide, as well as resin-bonded CBN grinding wheels and diamond grinding wheels.
  • FIG. 1 shows a segment 10 of a preferred embodiment of the present invention.
  • Segment 10 preferably comprises a thin layer of diamonds 11 disposed intermediate a first metal section 12 and a second metal section 13.
  • diamond layer 11 functions to true and dress the grinding wheel, the more narrow the diamond layer 11, the more closely the trueing and dressing tool of the present invention will operate as a single point trueing device.
  • diamond layer 11 only be a single diamond in width, in some instances it might be more practical to prepare tools wherein diamond layer 11 is several diamonds in width, for example, up to 0.8 millimeters in width, so as to provide a fine point trueing and dressing tool.
  • Diamond particles of any size may be employed in diamond layer 11, depending upon the trueing and dressing requirements.
  • larger size diamond particles e.g., 0.85/0.7 mm to 0.5/0.35 mm (20/25 to 30/40 U.S. mesh size) are utilized for trueing and dressing vitrified-banded CBN grinding wheels as they provide a longer useful life.
  • the artisan will be able to select suitable diamond particle sizes for use in trueing and dressing other types of grinding wheels without undue experimentation.
  • diamond layer 11 can be attached to one or both sides of the trueing tool, for example, by plating or metal banding.
  • This embodiment although simple to manufacture, suffers from the disadvantage that the diamond particles of the tool are not held in place as firmly as in the preferred embodiment.
  • Sections 12 and 13 may consist of any suitable metal bonding matrix with harder bonds such as those containing iron or cobalt being most preferred.
  • the most important criteria in selecting the material for sections 12 and 13 is that it be sufficiently hard to retain the diamonds of section 11 in the trueing and dressing tool of the present invention and will not deform or vibrate during use.
  • FIG. 2 illustates one embodiment of the present invention wherein a plurality of sections 10 shown in FIG. 1 are attached to disc 15, for example, by use of a suitable brazing material.
  • Disc 15 can be any suitable, relatively stiff material and preferably is a metal or metal alloy.
  • the core or disc 15 will be between 3.175 mm (1/8) and (3/8 inch) 9.525 mm in thickness.
  • Brazing material can be any of the well known brazed, for example, as described in US-A- 4,396,577 and 4,414,178. Of course, other suitable brazing materials will be obvious to those skilled in the art.
  • the diameter of the trueing and dressing wheel there are no limitations regarding the diameter of the trueing and dressing wheel other than it must be able to be mounted between the powered headstock and tailstack of a grinding machine as illustrated in FIG. 5.
  • the optimum diameter of the trueing and dressing wheel is most affected by the grinding machine on which it is to be used, the available speed of the headstock, and the diameter of the grinding wheel.
  • the trueing and dressing wheel of the present invention will range between four inches for use on small grinding wheels and ten inches or more for use on large grinding wheels.
  • FIG. 3 illustrates a preferred method for making the fine point trueing and dressing wheels of the invention.
  • first section 12 is cold pressed by means well known in the art in mold 17.
  • thin diamond layer 11 is applied across the entire upper surface of section 12 as shown in FIG. 3.
  • mold 17 would be the size of the trueing and dressing wheel, however, diamond layer 11 would only extend partially towards the center of the wheel in order to minimize the cost of the tool.
  • there would be an opening at the center of the mold which would correspond to the size of the wheel core as shown in FIG. 2.
  • an amount of metal band powder is added which is sufficient to form second section 13 upon hot pressing. If the unitary or second embodiment is being manufactured, hot pressing is all that is needed to make the finished trueing and dressing tool. If, however, only a segment 10 as shown in FIG. 1 is prepared by the hot pressing step, it is necessary to braze segment 10 to disc 15 as the final step.
  • FIG. 4 illustrates one means for securing the trueing and dressing tool 18 of the present invention to a spindle and flange assembly 19 which can be mounted between the headstock and tailstock of a grinding machine.
  • tool 18 is mounted through its central opening 20 onto spindle and flange assembly 19 and held in close contact with flange 21 by means of threaded screws 22.
  • the combined tool 18 and spindle and flange assembly 19 is then inserted into driving dog 23 in the same way as would a workpiece.
  • combined tool 18 and spindle and flange assembly 19 con be affixed to a headchuck, not shown.
  • the completed mounting assembly is secured between the existing headstock 24 and tailstock 25 of the grinding machine as shown in FIG. 5 when mounted between centers. It would, of course, be highly desirable to have a variety of spindle lengths available which are approximately equal to the length of commonly encountered workpieces. In this way, the operator can more easily substitute the trueing and dressing wheel for the workpiece.
  • Trueing and dressing is effected by engaging the periphery of the grinding wheel with the rotating trueing and dressing wheel.
  • Rotational power for the trueing and dressing wheel is supplied by the workhead of the grinding mochine and is transmitted to the trueing and dressing wheel via driving dog 23 or the workpiece chuck assembly, not shown.
  • driving dog 23 or the workpiece chuck assembly not shown.
  • Trueing and dressing is accomplished by traversing the trueing wheel 18 across the grinding wheel 26 using the grinding machine's powered table and feed controls.
  • the surface condition generated on grinding wheel 26 can be controlled by increasing the trueing or dressing rate for a finer finish, i.e., increasing or decreasing the machine table and/or infeed rate.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)

Claims (10)

  1. Outil pour rhabiller et dresser une meule, comprenant une meule ayant une fine couche de diamants disposée entre les côtés de l'outil dans un plan perpendiculaire à l'axe de rotation de la meule, caractérisé en ce que la roue comprend un disque ayant des segments qui lui sont fixés, lesdits segments contenant ladite fine couche de diamants.
  2. Outil selon la revendication 1, dans lequel la couche de diamants atteint 0,8 mm en largeur.
  3. Outil selon la revendication 1, dans lequel la couche de diamants est d'un seul diamant en largeur.
  4. Outil selon la revendication 1, dans lequel la taille des particules de diamant dans la couche de diamants est comprise entre 0,85/0,7 mm et 0,5/0,35 mm.
  5. Outil selon la revendication 1, dans lequel la couche de diamants est fixée à au moins un côté de l'outil.
  6. Outil selon la revendication 5, dans lequel la couche de diamants est fixée à l'outil par plaquage ou liaison par métal.
  7. Outil selon la revendication 1, dans lequel ledit outil a une épaisseur comprise entre 3,175 mm et 9,525mm.
  8. Procédé pour rhabiller et dresser une meule, comprenant la venue en contact à la périphérie d'une meule animée d'un mouvement de rotation avec un outil tournant de rhabillage et de dressage selon l'une quelconque des revendications 1 à 7.
  9. Procédé selon la revendication 8, dans lequel la puissance de rotation est transmise à l'outil de rhabillage et de dressage via un toc d'entraînement.
  10. Procédé selon la revendication 8, dans lequel la puissance de rotation est transmise à l'outil de rhabillage et de dressage via un mandrin de serrage.
EP88121499A 1988-01-28 1988-12-22 Outil pour une meule ainsi que méthode d'utilisation Expired - Lifetime EP0327719B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88121499T ATE75176T1 (de) 1988-01-28 1988-12-22 Werkzeug zum abrichten einer schleifscheibe sowie anwendungsmethode.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US14927488A 1988-01-28 1988-01-28
US149274 1988-01-28

Publications (2)

Publication Number Publication Date
EP0327719A1 EP0327719A1 (fr) 1989-08-16
EP0327719B1 true EP0327719B1 (fr) 1992-04-22

Family

ID=22529531

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88121499A Expired - Lifetime EP0327719B1 (fr) 1988-01-28 1988-12-22 Outil pour une meule ainsi que méthode d'utilisation

Country Status (5)

Country Link
EP (1) EP0327719B1 (fr)
JP (1) JPH01264771A (fr)
AT (1) ATE75176T1 (fr)
DE (1) DE3870438D1 (fr)
ES (1) ES2030837T3 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0632296Y2 (ja) * 1989-05-20 1994-08-24 豊田工機株式会社 砥石修正工具
ATE92826T1 (de) * 1989-08-25 1993-08-15 Swarovski Tyrolit Schleif Abrichten von schleifscheiben.
EP1974859B1 (fr) * 2005-12-22 2014-02-12 JTEKT Corporation Meuleuse cylindrique avec dispositif de rectification de meule et methode de rectification
JP5018058B2 (ja) * 2005-12-28 2012-09-05 株式会社ジェイテクト 砥石車のツルーイング装置及びツルーイング方法
CN107855937B (zh) * 2017-09-18 2023-09-26 郑州飞机装备有限责任公司 一种磨床砂轮斜面修整器
CN107553331B (zh) * 2017-09-18 2023-09-26 郑州飞机装备有限责任公司 一种砂轮多功能修整器

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD64957A (fr) *
US1544985A (en) * 1925-01-30 1925-07-07 Ferdinand J Hohnhorst Mechanism for truing and dressing grinding wheels
FR2040984B1 (fr) * 1969-03-14 1975-09-12 Smit Et Fils Ets
DE2811401A1 (de) * 1978-03-16 1979-09-20 Michael Dr Ing Kaiser Profilier- und abrichtscheibe sowie verfahren zu ihrem nacharbeiten
US4414178A (en) 1981-10-09 1983-11-08 General Electric Company Nickel-palladium-chromium-boron brazing alloy
US4396577A (en) 1981-10-09 1983-08-02 General Electric Company Cobalt-palladium-silicon-boron brazing alloy
DE3378897D1 (en) 1983-02-22 1989-02-16 Winter & Sohn Ernst Diamond form dressing roller for dressing grinding wheels

Also Published As

Publication number Publication date
ATE75176T1 (de) 1992-05-15
DE3870438D1 (de) 1992-05-27
JPH01264771A (ja) 1989-10-23
ES2030837T3 (es) 1992-11-16
EP0327719A1 (fr) 1989-08-16

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