GB2343133A - Dressing grinding wheels - Google Patents

Dressing grinding wheels Download PDF

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Publication number
GB2343133A
GB2343133A GB9819615A GB9819615A GB2343133A GB 2343133 A GB2343133 A GB 2343133A GB 9819615 A GB9819615 A GB 9819615A GB 9819615 A GB9819615 A GB 9819615A GB 2343133 A GB2343133 A GB 2343133A
Authority
GB
United Kingdom
Prior art keywords
dressing
wheel
grinding
grinding wheel
piece
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.)
Withdrawn
Application number
GB9819615A
Other versions
GB9819615D0 (en
Inventor
Alan Chalmers Stephen
John Kedward Owen
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.)
Renold PLC
Original Assignee
Renold PLC
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 Renold PLC filed Critical Renold PLC
Priority to GB9819615A priority Critical patent/GB2343133A/en
Publication of GB9819615D0 publication Critical patent/GB9819615D0/en
Publication of GB2343133A publication Critical patent/GB2343133A/en
Withdrawn legal-status Critical Current

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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
    • B24B53/04—Devices or means for dressing or conditioning abrasive surfaces of cylindrical or conical surfaces on abrasive tools or wheels
    • B24B53/053—Devices or means for dressing or conditioning abrasive surfaces of cylindrical or conical surfaces on abrasive tools or wheels using a rotary dressing tool
    • 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
    • B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes

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

Abstract

A grinding wheel 1 is dressed by bringing its periphery into contact with the periphery of the dressing wheel 2. The dressing wheel is first rotated in a direction opposite to the direction of rotation of the grinding wheel prior to or during grinding of a work-piece 3 in order to achieve a rough cut in which relatively large amounts of stock are removed from the work-piece. Then the dressing wheel is rotated in the same direction of rotation as that of the grinding wheel prior to or during the grinding of the work-piece so that a smooth surface finish is achieved. The method allows for an efficient grinding operation in which the operation cycle time and surface finish of the work-piece are optimised.

Description

GRINDING WHEELS The present invention relates to a method for dressing a grinding wheel.
During grinding operations it is necessary to dress the grinding wheel to ensure that a work-piece is presented with an efficient grinding surface of constant profile. Dressing the surface of the grinding wheel consists of breaking or removing abrasive grits in the wheel or abrading a bond that holds the grits together. In the dressing process, fresh abrasive material is exposed to allow the grinding wheel to cut without rubbing and thereby producing excess heat which may damage the workpiece. A grinding wheel is typically dressed by bringing it into contact, whilst rotating. with an abrasive rotary dressing wheel. The wheel may be in the form of a diamond coated disc or roller that may have a profile complementary to the desired shape of the work-piece. It is known to vary the ratio of the surface speeds of the dressing and grinding wheels according to the particular application.
In use, the dressing wheel is advanced into contact with the grinding wheel under the action of a control mechanism. In applications where the dressing wheel does not carry an impression of the profile to be produced on the grinding wheel, a mechanism is provided to traverse the dressing wheel across the periphery of the grinding wheel. In some applications the dressing wheel is arranged such that it is able to swivel so that it may be presented to the grinding wheel at an angle thereto. In other applications the dressing wheel may be in the form of a roller that is profiled so that there is no need to traverse across the periphery of the grinding wheel. The term "dressing"is used hereinafter to include forming, dressing or maintaining the periphery of a grinding w.., It is an object of the present invention to provide for an improved method of dressing a grinding wheel in an efficient manner.
According to the present invention there is provided a method for dressing a grinding wheel in which the periphery of the dressing wheel is brought into contact with the periphery of the grinding wheel, the method comprising the steps of first rotating the dressing wheel in the opposite direction of rotation to that of the grinding wheel prior to or during grinding of a work-piece with the grinding wheel and then rotating the dressing wheel in the same direction of rotation to that of the grinding wheel prior to or during the grinding of the work-piece.
A specific embodiment of the present invention will now be described, by way of example only, with reference to the accompanying drawings in which: Figure 1 is a diagrammatic representation of a dressing wheel being applied to a grinding wheel in a first direction of rotation; and Figure 2 is a diagrammatic representation of a dressing wheel being applied to a grinding wheel in a direction of rotation opposite to that shown in figure I.
Referring now to the drawings, figure I shows a grinding wheel I of diameter Dg which is rotating in a clockwise direction at a speed of rotation of Rg revolutions per minute. The periphery of the grinding wheel 1 is in contact with the periphery of a dressing wheel 2 having a diameter of Dd which is rotating in an anticlockwise direction at a speed of rotation of Rd revolutions per minute. The rotations of the wheels are such that at their point of contact the directions of travel of the contacting surfaces are the same. In the figures, a work-piece 3 is shown in contact with the periphery of the grinding wheel 1, although it is to be understood that the dressing and grinding operations may be performed separately. In operation, this arrangement (hereinafter referred to as"downcut mode") provides for a rough cut in which the surface of the grinding wheel 1, after dressing, is relatively open and rough and the surface finish of the work-piece is similarly rough. However, it allows for faster removal of the stock from the periphery of the work-piece than in conventional dressing in which the dressing and grinding wheels rotate in the same directions.
Figure 2 shows the same components as in figure 1, but with the dressing wheel 2 rotating clockwise i. e. in the same direction of rotation as the grinding wheel 1. The surfaces of the wheels 1, 2 at the point of contact are thus travelling in opposite directions. This arrangement (hereinafter referred to as"upcut mode") is that conventionally used to dress a grinding wheel I and provides for a smooth surface finish on the grinding wheel 1 and the work-piece 3.
The present invention lies in the method of first dressing the grinding wheel in downcut mode so that there is efficient removal of the stock from the work-piece, followed by dressing the grinding wheel in upcut mode so that the final surface finish of the work-piece is smooth. Prior to all but the final grinding operation a control system of the grinding machine ensures that the dressing wheel is operated in the downcut mode to enable fast cutting, reduced power consumption and less production of heat and therefore less risk of damage to the work-piece. To prepare the grinding wheel for the final grinding passes the dressing wheel is then operated in upcut mode so that the requisite surface finish is applied to the work-piece. By using this method, the overall cycle time is reduced, the power consume is reduced and the grinding process is optimised for cycle time and surface finish.
The grinding wheel is dressed in the upcut mode prior to any measurements of the work-piece being made.
The surface speed, Vg, of the grinding wheel is calculated by the following formula : Vg = (Dg. n. Rg)/1000 where Dg is the diameter of the wheel in rnm, Rg is the revolutions per minute andVg is in m/min.
The surface speed of the dressing wheel is given by the formula: Vd= (Dd. 7 Rd) l 1000 where Dd is the diameter of the wheel, Rd is revolutions per minute in mm and Vd is in m/min The speed ratio, Qd, of the wheels is Vd/Vg. For dressing in downcut mode Qd will be positive and will typically be in the range 0.4 to 0.9 and for dressing in the upcut mode Qd will be negative and in the range 4. 3 to 4. 8.
By varying the speed ratio the roughness of the grinding wheel can be changed. Increasing the speed ratio in the downcut mode will result in a coarser grinding wheel and therefore a rougher surface finish of the work-piece, whereas increasing the speed ratio during the upcut mode of operation will result in a smoother grinding wheel and a superior surface finish on the work-piece.

Claims (3)

  1. CLAIMS 1. A method for dressing a grinding wheel in which the periphery of the dressing wheel is brought into contact with the periphery of the grinding wheel, the method comprising the steps of first rotating the dressing wheel in the opposite direction of rotation to that of the grinding wheel prior to or during grinding of a work-piece with the grinding wheel and then rotating the dressing wheel in the same direction of rotation to that of the grinding wheel prior to or during the grinding of the work-piece.
  2. 2. A method of dressing a grinding wheel according to claim 1, wherein the speed of rotation of the dressing wheel is different to that of the grinding wheel.
  3. 3. A method of dressing a grinding wheel according to cZazm 1 or 2, wherein the work-piece is ground by the grinding wheel during the dressing operation.
GB9819615A 1998-09-09 1998-09-09 Dressing grinding wheels Withdrawn GB2343133A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9819615A GB2343133A (en) 1998-09-09 1998-09-09 Dressing grinding wheels

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9819615A GB2343133A (en) 1998-09-09 1998-09-09 Dressing grinding wheels

Publications (2)

Publication Number Publication Date
GB9819615D0 GB9819615D0 (en) 1998-11-04
GB2343133A true GB2343133A (en) 2000-05-03

Family

ID=10838551

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9819615A Withdrawn GB2343133A (en) 1998-09-09 1998-09-09 Dressing grinding wheels

Country Status (1)

Country Link
GB (1) GB2343133A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001089766A1 (en) * 2000-05-24 2001-11-29 Tyrolit Schleifmittelwerke Swarovski K.G. Method for grinding metallic workpieces containing, in particular, nickel

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1274582A (en) * 1969-03-03 1972-05-17 Gleason Works Improvements relating to apparatus for dressing grinding wheels
US4235218A (en) * 1978-02-20 1980-11-25 Toyoda-Koki Kabushiki-Kaisha Truing and dressing apparatus for grinding wheels
US4458660A (en) * 1980-12-11 1984-07-10 Gebr. Magerle Ag Apparatus and methods for preparing grinding wheels and performing grinding operations therewith
GB2207069A (en) * 1987-07-15 1989-01-25 Jeffrey Ernest Hunt Forming or trimming the periphery of a diamond impregnated grinding wheel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1274582A (en) * 1969-03-03 1972-05-17 Gleason Works Improvements relating to apparatus for dressing grinding wheels
US4235218A (en) * 1978-02-20 1980-11-25 Toyoda-Koki Kabushiki-Kaisha Truing and dressing apparatus for grinding wheels
US4458660A (en) * 1980-12-11 1984-07-10 Gebr. Magerle Ag Apparatus and methods for preparing grinding wheels and performing grinding operations therewith
GB2207069A (en) * 1987-07-15 1989-01-25 Jeffrey Ernest Hunt Forming or trimming the periphery of a diamond impregnated grinding wheel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001089766A1 (en) * 2000-05-24 2001-11-29 Tyrolit Schleifmittelwerke Swarovski K.G. Method for grinding metallic workpieces containing, in particular, nickel

Also Published As

Publication number Publication date
GB9819615D0 (en) 1998-11-04

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)