CA2254189A1 - A dressing roll for grinding wheels - Google Patents
A dressing roll for grinding wheels Download PDFInfo
- Publication number
- CA2254189A1 CA2254189A1 CA002254189A CA2254189A CA2254189A1 CA 2254189 A1 CA2254189 A1 CA 2254189A1 CA 002254189 A CA002254189 A CA 002254189A CA 2254189 A CA2254189 A CA 2254189A CA 2254189 A1 CA2254189 A1 CA 2254189A1
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- CA
- Canada
- Prior art keywords
- disk
- dressing roll
- conical
- diamonds
- slots
- 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.)
- Abandoned
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Polishing Bodies And Polishing Tools (AREA)
- Grinding-Machine Dressing And Accessory Apparatuses (AREA)
- Grinding Of Cylindrical And Plane Surfaces (AREA)
Abstract
A dressing roll for grinding wheels, said dressing roll including: a circular disk member of resilient material and having circumferentially spaced radial holding slots at its periphery, a plurality of diamonds of substantially same dimensionsadapted to be substantially fittingly received in said holding slots, and at least one support disk of deflection resistent material on one side of said disk member and having an outer radius approximately similar to the outer radius of said disk member.
Description
A Dressing Roll for Grinding Wheels Field of the Invention:
This invention relates to a dressing roll for grinding wheels.
Background of the Jnvention:
0 As is well known the term dressing means the fine machining of a rotating grinding member. The purpose thereof is the making or remaking of the geometrical shape and/or the abrasive property of the coating of the grinding member or tool.
Grinding tools the coating of which includes hard material grains or CBN grains (boron nitrite grains) generally are machined by dressing rolls having diamond coa-tings. It has become known to provide profiled diamond dressing rolls or formed diamond dressing rolls which are coated by coatings including diamond grains. One disadvantage of such dressing rolls is that the obtainable minim~l radius is relatively substantial. Therefore, it is difficult to satisfactorily dress grinding wheel profiles of small radii. Basically, it would be possible to perform such dressing by a single dia-mond. However, single diamonds wear relatively quickly. Replacement of the single diamonds in the carrier member requires a lot of time.
When for example gear members are ground by grinding wheels of not preci-sely dressed geometries, the required geometrical shape of the tooth profile will not be obtained. This may result in additional vibrations causing undesired noises in the gear mechanism and even in broken teeth. The precision obtainable by grinding de-pends on the preciseness of the grinding surface, and this depends on the preciseness of the shape of the dressing tool.
Summary ofthe Invention:
It is an object of the invention to provide a dressing roll including diamonds, s in particular for dressing CBN grinding wheels which dressing roll has a long ser-vice life, is adapted to provide for minim~l radii and which allows to precisely ma-chine coating surfaces.
To this end the present invention provides a dressing roll for grinding wheels, said dressing roll including: a circular disk member of resilient material and having o circumferentially spaced radial holding slots at its periphery, a plurality of diamonds of substantially same dimensions adapted to be substantially fittingly received in said holding slots, and at least one support disk of deflection resistent material on one side of said disk member and having an outer radius approximately similar tothe outer radius of said disk member.
s The dressing roll of the present invention includes at least three parts,namely a circular disk member having radial holding slots at its periphery, elongated dia-monds received in said holding slots, and at least one support disk on at least one side of the disk member.
The diamonds may be monocrystalline diamonds (MKD) or polycrystalline diamonds (PKD) which are inserted into the holding slots. The diamonds preferably are dimensioned such that they are clampingly received in the holding slots. Thedimensions of the diamonds are within certain tolerances. Selection of the diamonds ensures that the diamonds are clampingly received in the holding slots. Compensa-tion of the dimensional tolerances of the diamonds may be obtained by providing 2s radial compensation slots at the periphery of the disk members between adjacent holding slots in predetermined circumferentially spaced relationship, which com-pensation slots enable the segments therebetween to yield when the diamonds are overdimensioned. The compensation slots allow to compensate for any tolerances of the diamonds which may be of elongated shape. Preferably holes are provided in the area of the compensation slots to receive fastening means such as screws which al-CA 022~4189 1998-11-16 low to spread more or less the segments adjacent to the compensation slot so as to exert clamping forces upon the diamonds inserted in the holding slots.
The diamonds are ground at their outer ends so as to provide for a predeter-mined geoemtry, i.e. a radius. In order to use a small radius it is preferred that the support disk adjacent to the diamonds in an axial direction be of only small dimen-sions, preferably of conical shape such that a very acute angle will result. Such a dressing roll, therefore, allows to provide predetermined radii at the grinding tools.
The dressing roll of the invention allows to obtain substantial advantages.
The diamonds are mechanically fixed and therefore may be replaced if this is requi-o red. The use of a large number of individual diamonds at the periphery of the dres-sing roll increases the useful service life significantly as compared to that of e.g. a single diamond. Furthermore, lifetime of the dressing roll may be increased by fre-quent grinding thereof.
The structure of the dressing roll (modular structure of the individual parts) allows to manufacture the dressing rolls precisely in a reproducible manner. Thesingle parts may be premanufactured.
As already explained the indivudal diamonds may be mechanically clamped within the holding slots. Preferably, in order to improve the uniform clamping of diamonds, said holding slots have radially inwards extended portions of a width 20 which is smaller than that of said holding slots so as to define between said holding slots segments adapted to be deflected within the plane of said disk member.
Preferably, the segments are shaped such that, as a result of a deformation thereof, the surfaces of the holding slots which clamp a diamond are displaced in substantial-ly parallel relationship to each other so that substantially planar clamping is ensured.
In order to improve the deflection characteristics of the segments the inner ends of the extended slot portions each may open into a hole. Enlarged slot areas may beprovided in the area of the extended slot portions. The bit of a screwdriver for ex-ample may be inserted into said enlarged slot areas so as to spread adjacent seg-ments. This allows to remove a diamond and replace it by another diamond.
CA 022~4189 1998-11-16 -The support disks are preferably of conical shape at their periphery and pre-ferably include a very small angle thereat. The support disks preferably are of a hard material which may be ground together with the diamonds. Grinding of the dia-monds requires a special grinding coating which could smear the material when 5 support wheels of steel are used. This is not the case when hard materials such as cermet or ceramics are used. Preferably the invention uses a hard metal, cermet,ceramics, or a steel coated by a hard material. Such material is also advantageous because it is resistent to bending when the diamonds are loaded.
Said disk member and said at least one support disk are axially clamped toge-o ther, preferably by suitable screw means. Since the thickness of the diamonds varieswithin tolerances, it is preferred to provide a compensation layer between the disk member and the support disk. The compensation layer may be made of plastics, a molding alloy, a solder alloy, cellulose, galvanically separated metal or the like.
When two or more disk members are clamped between a pair of substantially simi-lar support disks, a compensation layer may be disposed also between the disk members. When two or more disk members having holding slots of identical cir-cumferential spacings are used, the diamonds of the respective disk members may be axially aligned or circumferentially offset with respect to each other.
When the dressing roll is to be formed as a conical roll, the disk member may 20 be shaped as a conical disk in its radially outer area and may be supported on one side by a matingly shaped support disk. Such a conical dressing roll allows precisely to machine planar coatings of CBN disks or the like. In such an arrangement the dia-monds preferably are of thickness somewhat in excess of the thickness of the coni-cal portion of the disk member so that they may become effective in the plane of the 25 cone envelope.
Two or more diamonds may be radially staggered. The radially staggered dia-monds may be disposed either in common slots or in separate slots; in the latter case the diamonds would be offset with respect to each other. Diamonds arranged alongdifferent pitch circles may be positioned under different cone angles.
CA 022~4189 1998-11-16 Such a conical dressing roll may be made by different methods. One such method includes the making of a pair of rotationally symmetrical formed members,preferably by turning. One of said formed members includes a concial recess and preferably has a cylindrical periphery. The other formed member includes an axially s extending conical portion which is fittingly received in said conical recess. The second formed member may also be of cylindrical shape, preferably with a diameter identical to that of the first formed member. Furthermore, the second formed mem-ber may be provided with an axial land which is fittingly received in a central bore of the first formed member. The two formed members are clamped together; there-10 after they may be provided with bores to receive connecting bolts. Furthermore, thefirst formed member will be machined (by turning) on its side remote from the second formed member, in particular to form a conical disk portion in its radially outer area. Thereafter the first formed member will be released from the second formed member, and the conical disk area will be machined to make holding slots and compensation slots if desired. This machinig may be performed in different ways, for example by punching, eroding, laser operations etc. Thereafter, the first and second formed members are again clamped together, and at the same time or before the diamonds are inserted into the holding slots. When the diamonds are fixed, the second formed member will be machined on its side remote from the first 20 formed member as to obtain a conical disk which is received by the first formed member, i.e. in its conical recess. The diamonds extend slightly beyond the outer periphery of such conical disk. Thereafter, the diamonds are ground to obtain the desired geometrical shape, for example a radiused shape.
In the following the invention will be explained in more detail with reference 25 to examples shown in the drawings.
Fig. 1 is an elevation of a disk member of the dressing roll of the invention.
Fig. 2 shows a detail of the disk member in Fig. 1 on an enlarged scale.
Fig. 3 shows an exploded view of a dressing roll including a pair of disk members shown in Fig. 1 and a pair of support rolls.
CA 022~4189 1998-11-16 Fig. 4 shows the mounted assembly of a dressing roll of the invention accor-ding to Fig. 3, however, including only one disk member.
Fig. 5 is a view of the dressing roll in Fig. 4 as seen in the direction of arrow 5.
Fig. 6 shows six method steps of making a conical dressing roll of the inven-tion.
Fig. 7 is a side elevation, partially in section, of the final conical dressing roll.
Fig. 8 is a side elevation of the conical dressing roll in Fig. 7 as seen in thedirection of arrow 8.
o Fig. 9 shows a detail ofthe dressing roll in Fig. 8 on an enlarged scale.
Fig. 1 shows a flat annular disk member 10 of steel of a thickness between 0.8 and 1 mm for example. At its outer periphery disk member 10 is provided with a row of holding slots 12 having a predetermined circumferential spacing. Details of the holding slots 12 are shown in Fig. 2. As may be seen the slots 12 comprise aholding portion 14 which is interrupted by a projection 16 extending into the slot 12.
Below the projection 16 there is a slot portion 18 which is of a greater width than the portion 14. Below the portion 18 there is an arcuate narrow slot portion ~0 which opens into a circular hole 22. This structure provides for radial segments 24 between slots 12; segments 24, due to the shape of the slots, are resiliently deform-able, i.e. they may be deformed also within the plane of disk member 10; during such deformation the opposite faces of the slot portion 14 will be displaced such that they will remain substantially parallel to each other.
Furthermore, Fig. 2 shows a radial compensation slot 26 which subdivides a segment 24 substantially centrally between adjacent holding slots 12. A circularhole 28 is provided approximately at the center of the longitudinal extent of the compensation slot 26. The circular hole may have a chamfer (not shown) for recei-ving a (not shown) bolt, screw or other clamping element. The bolt, screw or clamp-ing element may be used to spread more or less the respective segment portions formed by the compensation slot 26.
CA 022~4189 1998-11-16 Elongated or rod-like diamonds 32 will be inserted into the holding portions 14 of the slots. The diamonds are of a length of for example 4 mm and may be of substantially square cross-section of e.g. 0.8 x 0.8 mm. The width of the holding slot portions 14 may also be substantially 0.8 mm varying within tolerances as indicated 5 in Fig.2. The dimensions of the diamonds 32 also vary within substantial toleran-ces. When the width of a diamond 32 is identical to that of a holding slot portion 14, the diamond will be fittingly received therein. When the diamonds 32 are selected to be inserted into the holding slots 12 the following procedure will be preferred:When an e.g. overdimensioned diamond is inserted into a holding slot, an under-10 dimensioned diamond should be inserted in the following slot and possibly also in the next following slot so that all diamonds will be clampingly received in the slots between adjacent compensation slots. A still remaining overdimensioning then maybe compensated for by the compensation slot 28. On the other hand a remaining un-derdimensioning between adjacent compensation slots may be compensated for by spreading the compensation slot 26 by means ofthe above mentioned screw or bolt.The length ofthe holding slot portion 14 or the diamond 32 is such that the diamond 32 will be received in slot 12 in a predetermined arrangement.
Fig.3 is a side elevation of a pair of disk members 10a, 10b which are similar to disk member 10 containing diamonds 32. The disk members 10a, 10b can be 20 positioned relative to each other in different ways, for example such that the dia-monds 32 are axially aligned or are circumferentially offset with respect to each other. Furthermore, different circumferential spacings of the holding slots of disk members 10a, 10b may be selected. Furthermore, the diamonds may be retained by both disk members uniformly so as to provide for an overlap in the axial direction.
Furthermore, Fig.3 shows a pair of support disks 34,36 including an annular land 38 and 40, respectively, on their sides remote from disk members 10a and 10b and having conical disk portions 42 and 44, respectively, with a very small coneangle of for example 12 to 23~ at their radially outer ends. Finally, Fig.3 shows a mounting sleeve 46 including a sleeve portion 48 adapted to be fittingly passed 30 through the openings of the support disks 34,36 and the disk members 10a, 10b, CA 022~4189 1998-11-16 and a flange portion 50. The mounting sleeve 46 is provided to assist in assembling the shown parts and, if desired, to calmp the dressing roll of Figs. 4 and 5 in a dres-sing machine. As indicated in Fig. 3 the shown parts are clamped together by screws or bolts, with a bolt being indicated at 52. The bores in the support disks 34, 36 are 5 preformed or may be bored after assembly of all parts, with the disk members 1 Oa, lOb also including thrubores for bolts 52.
The parts shown in Fig. 3 after assembly thereof are shown, without the mounting sleeve in Fig. 4. However, only one disk member lO is disposed between the support disks 34, 36. As may be seen a small angle a of for example only 25~ is o provided at the periphery of the assembly. Of course the angle a may be chosen so as to be larger. After the assembly the diamonds 32 are ground to provide for a small radius thereof, for example between 0.05 and 0.5 mm. The support disks 42,44 are made of a material which can be ground together with diamonds 32. Such material is for example hard metal, cermet, ceramics, steel coated with a hard mate-rial, or the like.
In order to compensate for tolerances of the thickness of the diamonds a re-spective compensation material may be disposed between the disk members 10 or lOa, lOb and the support disks 34, 36. Such a compensation material may be for example plastics, a molding alloy, a solder alloy, cellulose or a galvanically separa-20 ted metal.
Fig. 6a shows two members 54, 56, with member 54 being a cylindrical parthaving a central bore and a conical recess 58 on one side as indicated by dotted li-nes. Recess 58 extends to the outer periphery of the formed member 54. The formed member 56 includes also a cylindrical portion 60 being of the same diameter as 25 formed member 54 and also including a conical portion 62 which is complementary to recess 58. Integral with the conical portion 52 is an axial hub portion 64 which is fittingly received in the bore of the formed member 52. The formed member 56 hasa thrubore as indicated by dotted lines.
Fig. 6b shows the manner in which the formed members 52, 56 are clamped together. There are bores one of which is indicated at 64 by dotted lines. As may be CA 022~4189 1998-11-16 -seen in Fig. 6c the formed member 54 has been machined so as to provide for a co-nical disk 66 having an axial land 68. The conical disk 66 is shown by itself, in part section, in Fig. 6d after the formed member 56 has been removed.
The conical portion of the conical disk 66 may be provided, for example, by 5 eroding, with holding slots 12a which are approximately similar to the holding slots 12 in Fig. 2. Therefore, the shape of slots 12a will not be described in more detail.
Furthermore, there are provided compensation slots 26a. The holding slots 12 recei-ve rodlike diamonds 32a. As may be seen in Fig. 7, the diamonds 32a project be-yond the plane of the outer cone surface. As a result such cone surface and the base o of the cone include an angle of about 20~.
When the disk 66 has been manufactured it will be reassembled with the formed member 56a as may be seen in Fig. 6e. Thereafter, bores 70 and 72 will bebored into the formed member 56 substantially perpendicularly to the conical porti-on of disk 66. When the diamonds 32a have been assembled in accordance with Fig.6f, the disk 66 may be additionally fixed to the formed members 56 by bolts 74. The lower bolts may extend through bores 76 (Fig. 8), and the upper bolts 74 may ex-tend into chamfered bores 28a in order to clampingly hold the diamonds 32a in the disk 66.
In a last step the formed member 56 will be machined such as to provide for a 20 conical disk 78 according to Fig. 7 which will be completely received in the conical disk 66.
The result is a conical dressing roll. Thereafter the diamonds 32a will be gro-und to provide for a radiused shape thereof.
CA 022~4189 1998-11-16
This invention relates to a dressing roll for grinding wheels.
Background of the Jnvention:
0 As is well known the term dressing means the fine machining of a rotating grinding member. The purpose thereof is the making or remaking of the geometrical shape and/or the abrasive property of the coating of the grinding member or tool.
Grinding tools the coating of which includes hard material grains or CBN grains (boron nitrite grains) generally are machined by dressing rolls having diamond coa-tings. It has become known to provide profiled diamond dressing rolls or formed diamond dressing rolls which are coated by coatings including diamond grains. One disadvantage of such dressing rolls is that the obtainable minim~l radius is relatively substantial. Therefore, it is difficult to satisfactorily dress grinding wheel profiles of small radii. Basically, it would be possible to perform such dressing by a single dia-mond. However, single diamonds wear relatively quickly. Replacement of the single diamonds in the carrier member requires a lot of time.
When for example gear members are ground by grinding wheels of not preci-sely dressed geometries, the required geometrical shape of the tooth profile will not be obtained. This may result in additional vibrations causing undesired noises in the gear mechanism and even in broken teeth. The precision obtainable by grinding de-pends on the preciseness of the grinding surface, and this depends on the preciseness of the shape of the dressing tool.
Summary ofthe Invention:
It is an object of the invention to provide a dressing roll including diamonds, s in particular for dressing CBN grinding wheels which dressing roll has a long ser-vice life, is adapted to provide for minim~l radii and which allows to precisely ma-chine coating surfaces.
To this end the present invention provides a dressing roll for grinding wheels, said dressing roll including: a circular disk member of resilient material and having o circumferentially spaced radial holding slots at its periphery, a plurality of diamonds of substantially same dimensions adapted to be substantially fittingly received in said holding slots, and at least one support disk of deflection resistent material on one side of said disk member and having an outer radius approximately similar tothe outer radius of said disk member.
s The dressing roll of the present invention includes at least three parts,namely a circular disk member having radial holding slots at its periphery, elongated dia-monds received in said holding slots, and at least one support disk on at least one side of the disk member.
The diamonds may be monocrystalline diamonds (MKD) or polycrystalline diamonds (PKD) which are inserted into the holding slots. The diamonds preferably are dimensioned such that they are clampingly received in the holding slots. Thedimensions of the diamonds are within certain tolerances. Selection of the diamonds ensures that the diamonds are clampingly received in the holding slots. Compensa-tion of the dimensional tolerances of the diamonds may be obtained by providing 2s radial compensation slots at the periphery of the disk members between adjacent holding slots in predetermined circumferentially spaced relationship, which com-pensation slots enable the segments therebetween to yield when the diamonds are overdimensioned. The compensation slots allow to compensate for any tolerances of the diamonds which may be of elongated shape. Preferably holes are provided in the area of the compensation slots to receive fastening means such as screws which al-CA 022~4189 1998-11-16 low to spread more or less the segments adjacent to the compensation slot so as to exert clamping forces upon the diamonds inserted in the holding slots.
The diamonds are ground at their outer ends so as to provide for a predeter-mined geoemtry, i.e. a radius. In order to use a small radius it is preferred that the support disk adjacent to the diamonds in an axial direction be of only small dimen-sions, preferably of conical shape such that a very acute angle will result. Such a dressing roll, therefore, allows to provide predetermined radii at the grinding tools.
The dressing roll of the invention allows to obtain substantial advantages.
The diamonds are mechanically fixed and therefore may be replaced if this is requi-o red. The use of a large number of individual diamonds at the periphery of the dres-sing roll increases the useful service life significantly as compared to that of e.g. a single diamond. Furthermore, lifetime of the dressing roll may be increased by fre-quent grinding thereof.
The structure of the dressing roll (modular structure of the individual parts) allows to manufacture the dressing rolls precisely in a reproducible manner. Thesingle parts may be premanufactured.
As already explained the indivudal diamonds may be mechanically clamped within the holding slots. Preferably, in order to improve the uniform clamping of diamonds, said holding slots have radially inwards extended portions of a width 20 which is smaller than that of said holding slots so as to define between said holding slots segments adapted to be deflected within the plane of said disk member.
Preferably, the segments are shaped such that, as a result of a deformation thereof, the surfaces of the holding slots which clamp a diamond are displaced in substantial-ly parallel relationship to each other so that substantially planar clamping is ensured.
In order to improve the deflection characteristics of the segments the inner ends of the extended slot portions each may open into a hole. Enlarged slot areas may beprovided in the area of the extended slot portions. The bit of a screwdriver for ex-ample may be inserted into said enlarged slot areas so as to spread adjacent seg-ments. This allows to remove a diamond and replace it by another diamond.
CA 022~4189 1998-11-16 -The support disks are preferably of conical shape at their periphery and pre-ferably include a very small angle thereat. The support disks preferably are of a hard material which may be ground together with the diamonds. Grinding of the dia-monds requires a special grinding coating which could smear the material when 5 support wheels of steel are used. This is not the case when hard materials such as cermet or ceramics are used. Preferably the invention uses a hard metal, cermet,ceramics, or a steel coated by a hard material. Such material is also advantageous because it is resistent to bending when the diamonds are loaded.
Said disk member and said at least one support disk are axially clamped toge-o ther, preferably by suitable screw means. Since the thickness of the diamonds varieswithin tolerances, it is preferred to provide a compensation layer between the disk member and the support disk. The compensation layer may be made of plastics, a molding alloy, a solder alloy, cellulose, galvanically separated metal or the like.
When two or more disk members are clamped between a pair of substantially simi-lar support disks, a compensation layer may be disposed also between the disk members. When two or more disk members having holding slots of identical cir-cumferential spacings are used, the diamonds of the respective disk members may be axially aligned or circumferentially offset with respect to each other.
When the dressing roll is to be formed as a conical roll, the disk member may 20 be shaped as a conical disk in its radially outer area and may be supported on one side by a matingly shaped support disk. Such a conical dressing roll allows precisely to machine planar coatings of CBN disks or the like. In such an arrangement the dia-monds preferably are of thickness somewhat in excess of the thickness of the coni-cal portion of the disk member so that they may become effective in the plane of the 25 cone envelope.
Two or more diamonds may be radially staggered. The radially staggered dia-monds may be disposed either in common slots or in separate slots; in the latter case the diamonds would be offset with respect to each other. Diamonds arranged alongdifferent pitch circles may be positioned under different cone angles.
CA 022~4189 1998-11-16 Such a conical dressing roll may be made by different methods. One such method includes the making of a pair of rotationally symmetrical formed members,preferably by turning. One of said formed members includes a concial recess and preferably has a cylindrical periphery. The other formed member includes an axially s extending conical portion which is fittingly received in said conical recess. The second formed member may also be of cylindrical shape, preferably with a diameter identical to that of the first formed member. Furthermore, the second formed mem-ber may be provided with an axial land which is fittingly received in a central bore of the first formed member. The two formed members are clamped together; there-10 after they may be provided with bores to receive connecting bolts. Furthermore, thefirst formed member will be machined (by turning) on its side remote from the second formed member, in particular to form a conical disk portion in its radially outer area. Thereafter the first formed member will be released from the second formed member, and the conical disk area will be machined to make holding slots and compensation slots if desired. This machinig may be performed in different ways, for example by punching, eroding, laser operations etc. Thereafter, the first and second formed members are again clamped together, and at the same time or before the diamonds are inserted into the holding slots. When the diamonds are fixed, the second formed member will be machined on its side remote from the first 20 formed member as to obtain a conical disk which is received by the first formed member, i.e. in its conical recess. The diamonds extend slightly beyond the outer periphery of such conical disk. Thereafter, the diamonds are ground to obtain the desired geometrical shape, for example a radiused shape.
In the following the invention will be explained in more detail with reference 25 to examples shown in the drawings.
Fig. 1 is an elevation of a disk member of the dressing roll of the invention.
Fig. 2 shows a detail of the disk member in Fig. 1 on an enlarged scale.
Fig. 3 shows an exploded view of a dressing roll including a pair of disk members shown in Fig. 1 and a pair of support rolls.
CA 022~4189 1998-11-16 Fig. 4 shows the mounted assembly of a dressing roll of the invention accor-ding to Fig. 3, however, including only one disk member.
Fig. 5 is a view of the dressing roll in Fig. 4 as seen in the direction of arrow 5.
Fig. 6 shows six method steps of making a conical dressing roll of the inven-tion.
Fig. 7 is a side elevation, partially in section, of the final conical dressing roll.
Fig. 8 is a side elevation of the conical dressing roll in Fig. 7 as seen in thedirection of arrow 8.
o Fig. 9 shows a detail ofthe dressing roll in Fig. 8 on an enlarged scale.
Fig. 1 shows a flat annular disk member 10 of steel of a thickness between 0.8 and 1 mm for example. At its outer periphery disk member 10 is provided with a row of holding slots 12 having a predetermined circumferential spacing. Details of the holding slots 12 are shown in Fig. 2. As may be seen the slots 12 comprise aholding portion 14 which is interrupted by a projection 16 extending into the slot 12.
Below the projection 16 there is a slot portion 18 which is of a greater width than the portion 14. Below the portion 18 there is an arcuate narrow slot portion ~0 which opens into a circular hole 22. This structure provides for radial segments 24 between slots 12; segments 24, due to the shape of the slots, are resiliently deform-able, i.e. they may be deformed also within the plane of disk member 10; during such deformation the opposite faces of the slot portion 14 will be displaced such that they will remain substantially parallel to each other.
Furthermore, Fig. 2 shows a radial compensation slot 26 which subdivides a segment 24 substantially centrally between adjacent holding slots 12. A circularhole 28 is provided approximately at the center of the longitudinal extent of the compensation slot 26. The circular hole may have a chamfer (not shown) for recei-ving a (not shown) bolt, screw or other clamping element. The bolt, screw or clamp-ing element may be used to spread more or less the respective segment portions formed by the compensation slot 26.
CA 022~4189 1998-11-16 Elongated or rod-like diamonds 32 will be inserted into the holding portions 14 of the slots. The diamonds are of a length of for example 4 mm and may be of substantially square cross-section of e.g. 0.8 x 0.8 mm. The width of the holding slot portions 14 may also be substantially 0.8 mm varying within tolerances as indicated 5 in Fig.2. The dimensions of the diamonds 32 also vary within substantial toleran-ces. When the width of a diamond 32 is identical to that of a holding slot portion 14, the diamond will be fittingly received therein. When the diamonds 32 are selected to be inserted into the holding slots 12 the following procedure will be preferred:When an e.g. overdimensioned diamond is inserted into a holding slot, an under-10 dimensioned diamond should be inserted in the following slot and possibly also in the next following slot so that all diamonds will be clampingly received in the slots between adjacent compensation slots. A still remaining overdimensioning then maybe compensated for by the compensation slot 28. On the other hand a remaining un-derdimensioning between adjacent compensation slots may be compensated for by spreading the compensation slot 26 by means ofthe above mentioned screw or bolt.The length ofthe holding slot portion 14 or the diamond 32 is such that the diamond 32 will be received in slot 12 in a predetermined arrangement.
Fig.3 is a side elevation of a pair of disk members 10a, 10b which are similar to disk member 10 containing diamonds 32. The disk members 10a, 10b can be 20 positioned relative to each other in different ways, for example such that the dia-monds 32 are axially aligned or are circumferentially offset with respect to each other. Furthermore, different circumferential spacings of the holding slots of disk members 10a, 10b may be selected. Furthermore, the diamonds may be retained by both disk members uniformly so as to provide for an overlap in the axial direction.
Furthermore, Fig.3 shows a pair of support disks 34,36 including an annular land 38 and 40, respectively, on their sides remote from disk members 10a and 10b and having conical disk portions 42 and 44, respectively, with a very small coneangle of for example 12 to 23~ at their radially outer ends. Finally, Fig.3 shows a mounting sleeve 46 including a sleeve portion 48 adapted to be fittingly passed 30 through the openings of the support disks 34,36 and the disk members 10a, 10b, CA 022~4189 1998-11-16 and a flange portion 50. The mounting sleeve 46 is provided to assist in assembling the shown parts and, if desired, to calmp the dressing roll of Figs. 4 and 5 in a dres-sing machine. As indicated in Fig. 3 the shown parts are clamped together by screws or bolts, with a bolt being indicated at 52. The bores in the support disks 34, 36 are 5 preformed or may be bored after assembly of all parts, with the disk members 1 Oa, lOb also including thrubores for bolts 52.
The parts shown in Fig. 3 after assembly thereof are shown, without the mounting sleeve in Fig. 4. However, only one disk member lO is disposed between the support disks 34, 36. As may be seen a small angle a of for example only 25~ is o provided at the periphery of the assembly. Of course the angle a may be chosen so as to be larger. After the assembly the diamonds 32 are ground to provide for a small radius thereof, for example between 0.05 and 0.5 mm. The support disks 42,44 are made of a material which can be ground together with diamonds 32. Such material is for example hard metal, cermet, ceramics, steel coated with a hard mate-rial, or the like.
In order to compensate for tolerances of the thickness of the diamonds a re-spective compensation material may be disposed between the disk members 10 or lOa, lOb and the support disks 34, 36. Such a compensation material may be for example plastics, a molding alloy, a solder alloy, cellulose or a galvanically separa-20 ted metal.
Fig. 6a shows two members 54, 56, with member 54 being a cylindrical parthaving a central bore and a conical recess 58 on one side as indicated by dotted li-nes. Recess 58 extends to the outer periphery of the formed member 54. The formed member 56 includes also a cylindrical portion 60 being of the same diameter as 25 formed member 54 and also including a conical portion 62 which is complementary to recess 58. Integral with the conical portion 52 is an axial hub portion 64 which is fittingly received in the bore of the formed member 52. The formed member 56 hasa thrubore as indicated by dotted lines.
Fig. 6b shows the manner in which the formed members 52, 56 are clamped together. There are bores one of which is indicated at 64 by dotted lines. As may be CA 022~4189 1998-11-16 -seen in Fig. 6c the formed member 54 has been machined so as to provide for a co-nical disk 66 having an axial land 68. The conical disk 66 is shown by itself, in part section, in Fig. 6d after the formed member 56 has been removed.
The conical portion of the conical disk 66 may be provided, for example, by 5 eroding, with holding slots 12a which are approximately similar to the holding slots 12 in Fig. 2. Therefore, the shape of slots 12a will not be described in more detail.
Furthermore, there are provided compensation slots 26a. The holding slots 12 recei-ve rodlike diamonds 32a. As may be seen in Fig. 7, the diamonds 32a project be-yond the plane of the outer cone surface. As a result such cone surface and the base o of the cone include an angle of about 20~.
When the disk 66 has been manufactured it will be reassembled with the formed member 56a as may be seen in Fig. 6e. Thereafter, bores 70 and 72 will bebored into the formed member 56 substantially perpendicularly to the conical porti-on of disk 66. When the diamonds 32a have been assembled in accordance with Fig.6f, the disk 66 may be additionally fixed to the formed members 56 by bolts 74. The lower bolts may extend through bores 76 (Fig. 8), and the upper bolts 74 may ex-tend into chamfered bores 28a in order to clampingly hold the diamonds 32a in the disk 66.
In a last step the formed member 56 will be machined such as to provide for a 20 conical disk 78 according to Fig. 7 which will be completely received in the conical disk 66.
The result is a conical dressing roll. Thereafter the diamonds 32a will be gro-und to provide for a radiused shape thereof.
CA 022~4189 1998-11-16
Claims (17)
1. A dressing roll for grinding wheels, said dressing roll including:
a circular disk member of resilient material and having circumferentially spaced radial holding slots at its periphery, a plurality of diamonds of substantially same dimensions adapted to be substantially fittingly received in said holding slots, and at least one support disk of deflection resistent material on one side of said disk member and having an outer radius approximately similar to the outer radius of said disk member.
a circular disk member of resilient material and having circumferentially spaced radial holding slots at its periphery, a plurality of diamonds of substantially same dimensions adapted to be substantially fittingly received in said holding slots, and at least one support disk of deflection resistent material on one side of said disk member and having an outer radius approximately similar to the outer radius of said disk member.
2. A dressing roll as defined in claim 1 wherein said holding slots have radially inwards extended portions of a width which is smaller than that of saidholding slots so as to define between said holding slots segments adapted to be deflected within the plane of said disk member.
3. A dressing roll as defined in claim 2 wherein said extended slot portions are of a shape so as to allow for deformation of the segments such that walls of said holding slots remain substantially parallel to each other.
4. A dressing roll as defined in claim 2 wherein said extended slot portions have inner ends each opening into a hole.
5. A dressing roll as defined in claim 2 wherein said extended slot portions each include an enlarged slot area.
6. A dressing roll as defined in claim 1 wherein said disk member at its periphery has radial compensation slots disposed between adjacent holding slots in predetermined circumferentially spaced relationship with respect to each other.
7. A dressing roll as defined in claim 6 wherein said compensation slots have openings for receiving a screw or clamping element to allow for selectively changing the width of said compensation slots.
8. A dressing roll as defined in claim 1 wherein said support disk is formed as a profiled disk of a predetermined profile at its outer periphery.
9. A dressing roll as defined in claim 1 wherein said diamonds are of elongated shape and are ground at their outer ends so as to be of a predetermined geometrical shape.
10. A dressing roll as defined in claim 1 wherein said support disk is made of a hard material adapted to be ground together with the diamonds.
11. A dressing roll as defined in claim 10 wherein said support disk is made of hard metal, cermet, ceramics or of a material coated by a hard material.
12. A dressing roll as defined in claim 1 wherein said disk member is clamped between a pair of similar support disks so as to define for a forming roll.
13. A dressing roll as defined in claim 12 wherein two or more disk members are disposed adjacent to each other.
14. A dressing roll as defined in claim 12 wherein compensation material is disposed between said disk members or between each of said disk members and saidsupport disk.
15. A dressing roll as defined in claim 14 wherein said compensation material is plastics, a molding alloy, a solder alloy, cellulose, or a galvanically separated metal.
16. A dressing roll as defined in claim 1 wherein said disk member in its radially outer area is in the shape of a conical disk and is supported on one side by a matingly shaped support disk so as to define a conical dress roll.
17. A method of making a conical dressing roll as defined in claim 16 and including the following method steps:
- providing first and second formed members which are rotationally symmetrical, said first formed member including a conical recess and said second formed member including a matingly shaped axial portion;
- clamping together said first and second formed members and machining said first formed member at a side remote from said second formed member to obtain a conical disk;
- forming holding slots in said conical disk remote from said second formed member;
- clamping together said conical disk and said second formed member and making bores therein for interconnecting said conical disk and said second formed member by screw means;
- machining said second formed member at its side remote from said conical disk to obtain a conical support disk;
- inserting said diamonds into said holding slots at the same time or at an earlier time and fixing them therein;
grinding said diamonds at their inner ends so as to provide them with a desired radius.
- providing first and second formed members which are rotationally symmetrical, said first formed member including a conical recess and said second formed member including a matingly shaped axial portion;
- clamping together said first and second formed members and machining said first formed member at a side remote from said second formed member to obtain a conical disk;
- forming holding slots in said conical disk remote from said second formed member;
- clamping together said conical disk and said second formed member and making bores therein for interconnecting said conical disk and said second formed member by screw means;
- machining said second formed member at its side remote from said conical disk to obtain a conical support disk;
- inserting said diamonds into said holding slots at the same time or at an earlier time and fixing them therein;
grinding said diamonds at their inner ends so as to provide them with a desired radius.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19754517A DE19754517C2 (en) | 1997-12-09 | 1997-12-09 | Dressing roller for grinding wheels and method for producing a dressing roller |
| DE19754517.3 | 1997-12-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2254189A1 true CA2254189A1 (en) | 1999-06-09 |
Family
ID=7851192
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002254189A Abandoned CA2254189A1 (en) | 1997-12-09 | 1998-11-16 | A dressing roll for grinding wheels |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0922533B1 (en) |
| JP (1) | JPH11245167A (en) |
| AT (1) | ATE219988T1 (en) |
| BR (1) | BR9805245A (en) |
| CA (1) | CA2254189A1 (en) |
| DE (2) | DE19754517C2 (en) |
| ES (1) | ES2176883T3 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10933509B2 (en) | 2017-06-16 | 2021-03-02 | Rolls-Royce Plc | Abrasive machining |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT410912B (en) * | 2002-02-18 | 2003-08-25 | Swarovski Tyrolit Schleif | Dressing roller for grinding wheels |
| DE502006007682D1 (en) * | 2006-03-21 | 2010-09-30 | Mueller Diamantmetall Ag Dr | Surface machining tool and method of making such tool |
| DE202009018978U1 (en) | 2009-09-12 | 2015-02-06 | Saint-Gobain Diamantwerkzeuge Gmbh | Device for dressing grinding wheels |
| DE102017214278A1 (en) * | 2017-08-16 | 2019-02-21 | ROT GmbH | Dressing tool comprising a metallic base body with a peripheral edge or peripheral surface which is occupied by hard material elements |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE35294C (en) * | WAGNER - SCHNEIDER in Steckborn, Schweiz und in Hemmenhofen, Baden | Milling wheel for sharpening and turning grindstones | ||
| DE369862C (en) * | 1921-11-18 | 1923-02-23 | Julius Blank | Sharpening roller for wood whetstones |
| FR2540025B1 (en) * | 1983-01-28 | 1991-05-10 | Precidia | ROTARY TOOL HAVING A REVOLUTION BODY PROVIDED WITH ACTIVE ELEMENTS FOR MACHINING MATERIALS SUCH AS GRANITE, MARBLE OR A REFRACTORY PRODUCT |
| DE3378897D1 (en) * | 1983-02-22 | 1989-02-16 | Winter & Sohn Ernst | Diamond form dressing roller for dressing grinding wheels |
| US4972646A (en) * | 1988-03-14 | 1990-11-27 | Foam Form Systems, Inc. | Concrete forming system |
| JPH029576A (en) * | 1988-06-28 | 1990-01-12 | Nippei Toyama Corp | Grinder wheel dressing device |
| JPH03149182A (en) * | 1989-10-31 | 1991-06-25 | Toyoda Mach Works Ltd | Diamond dresser |
-
1997
- 1997-12-09 DE DE19754517A patent/DE19754517C2/en not_active Expired - Fee Related
-
1998
- 1998-11-04 ES ES98120879T patent/ES2176883T3/en not_active Expired - Lifetime
- 1998-11-04 AT AT98120879T patent/ATE219988T1/en not_active IP Right Cessation
- 1998-11-04 DE DE59804648T patent/DE59804648D1/en not_active Expired - Fee Related
- 1998-11-04 EP EP98120879A patent/EP0922533B1/en not_active Expired - Lifetime
- 1998-11-16 CA CA002254189A patent/CA2254189A1/en not_active Abandoned
- 1998-12-08 BR BR9805245-4A patent/BR9805245A/en not_active Application Discontinuation
- 1998-12-08 JP JP10368496A patent/JPH11245167A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10933509B2 (en) | 2017-06-16 | 2021-03-02 | Rolls-Royce Plc | Abrasive machining |
Also Published As
| Publication number | Publication date |
|---|---|
| ATE219988T1 (en) | 2002-07-15 |
| EP0922533B1 (en) | 2002-07-03 |
| DE19754517A1 (en) | 1999-06-17 |
| JPH11245167A (en) | 1999-09-14 |
| BR9805245A (en) | 1999-11-23 |
| EP0922533A3 (en) | 2001-03-28 |
| EP0922533A2 (en) | 1999-06-16 |
| DE19754517C2 (en) | 2001-02-01 |
| ES2176883T3 (en) | 2002-12-01 |
| DE59804648D1 (en) | 2002-08-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |