EP0321970B1 - Schleifscheibe - Google Patents

Schleifscheibe Download PDF

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Publication number
EP0321970B1
EP0321970B1 EP88121444A EP88121444A EP0321970B1 EP 0321970 B1 EP0321970 B1 EP 0321970B1 EP 88121444 A EP88121444 A EP 88121444A EP 88121444 A EP88121444 A EP 88121444A EP 0321970 B1 EP0321970 B1 EP 0321970B1
Authority
EP
European Patent Office
Prior art keywords
grinding wheel
flange
ring part
elements
polygon
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
EP88121444A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0321970A3 (en
EP0321970A2 (de
Inventor
Gunter Weinich
Herbert Setzer
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.)
Fortuna Werke Maschinenfabrik GmbH
Original Assignee
Fortuna Werke Maschinenfabrik GmbH
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 Fortuna Werke Maschinenfabrik GmbH filed Critical Fortuna Werke Maschinenfabrik GmbH
Publication of EP0321970A2 publication Critical patent/EP0321970A2/de
Publication of EP0321970A3 publication Critical patent/EP0321970A3/de
Application granted granted Critical
Publication of EP0321970B1 publication Critical patent/EP0321970B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
    • B24D5/16—Bushings; Mountings

Definitions

  • the invention relates to a grinding wheel with a disc-shaped body having a circumferential processing surface made of grinding material, and with a preferably at least two-part flange, which preferably holds the body on both sides and has a receiving opening for a mandrel of a grinding machine.
  • the entire body consists of grinding material and the periphery of the body is provided with an external cylindrical or external conical grinding surface, depending on whether the axis of the grinding spindle is parallel to the axis of the workpiece to be machined or inclined thereto.
  • known grinding disks use multi-part flanges which on the one hand enclose the body on its two flat sides between them and on the other hand Make a large central opening in the body to form a metal receiving opening for the mandrel of the grinding spindle.
  • the grinding wheel consists of a metallic support body which is of high quality only on its circumference Abrasive material, for example CBN (Cubic Boron Nitride), as is known for example from DE-PS 33 22 258.
  • CBN Cubic Boron Nitride
  • a disc-shaped, metallic grinding wheel body is provided with a cylindrical receiving opening which has three axially parallel grooves which are offset uniformly over the circumference.
  • the mandrel of the associated grinding machine is cylindrical, the diameter of the cylinder being significantly smaller than the diameter of the receiving opening of the grinding wheel body.
  • the mandrel is provided with three axially parallel wedges evenly offset with the circumference, the circumferential surface of which is circular-cylindrical, the diameter of this circular-cylindrical end face of the wedges being only about 10 ⁇ m smaller than the inside diameter of the circular-cylindrical receiving opening of the grinding wheel body.
  • the wedges are provided on the edges of the circular cylindrical sections with inclined surfaces inclined in the circumferential direction.
  • the known grinding wheel To mount the known grinding wheel, it is pushed axially onto the mandrel in a circumferential position, in which the wedges engage straight into the grooves, the arrangement being such that the wedges only extend over a smaller circumferential angle than the grooves.
  • the grinding wheel is arranged with sufficient play to the arbor. If the grinding wheel is now rotated relative to the holding mandrel, the circular cylindrical sections of the receiving opening of the grinding wheel body on the one hand and the prongs of the holding mandrel on the other hand overlap, with the result that the grinding wheel sits on the holding mandrel with only a slight radial play of a few ⁇ . Then it becomes a clamping flange placed on the arbor from the outside and this clamping flange then screwed to the grinding wheel and a supporting part of the arbor.
  • the known arrangement has the disadvantage that the fit between the grinding wheel and the mandrel can never be better than the difference in diameter between the said circular cylindrical sections.
  • the known grinding wheel has the disadvantage that there is no defined circumferential position in which there is an optimal centering between the grinding wheel and the mandrel, because when the circular cylindrical sections overlap one another, the grinding wheel has a circumferential angle of approximately 45 ° with respect to the mandrel can be rotated without changing the fit between the arbor and grinding wheel.
  • the invention is based on the object of developing a grinding wheel of the type mentioned in such a way that a precise centering of the body to the flange is possible with simple assembly.
  • a first flange part has a circumferential surface with a cross-sectional shape of an n-polygon lying in a radial plane has that the body rests on the circumferential surface via radially inwardly projecting elements, that the number of elements corresponds to the number of corners of the polygon and that the elements can be rotated in the circumferential direction relative to the circumferential surface.
  • the grinding wheel according to the invention thus opens up the possibility of also using bodies which consist of a wheel-shaped metal part which is only provided on the outer circumference with a covering made of grinding material, for example CBN grinding material.
  • bodies which consist of a wheel-shaped metal part which is only provided on the outer circumference with a covering made of grinding material, for example CBN grinding material.
  • conventional balancing with a possible eccentricity would not be possible, because eccentric mounting and thus an imbalance of the metallic body could not be compensated for by dressing the weight of the grinding material, which was considerably smaller.
  • the grinding wheel according to the invention eliminates these disadvantages in that the relatively heavy metallic disk-shaped body is attached to the flange in a self-centering manner.
  • the body encloses, with an inner circumference, a first ring part which is provided with a number of elements distributed regularly over its circumference, which are arranged in the first ring part and protrude inward from the first ring part.
  • This measure has the advantage that the part provided with the elements is constructed in a manner that is simple to produce, because only a rotationally symmetrical and therefore easy to produce first ring part has to be provided with the radially projecting elements. It is also possible in this way to work with any number of corners of polygons without great design difficulties, because, for example when using a triangular polygon, corresponding first ring parts can be used, which then only have to be provided with three or four elements distributed over the circumference.
  • the elements are designed as preferably cylindrical bolts which project radially from the first ring part with a collar.
  • This measure has the advantage that the radial position of the protruding collars can be adjusted for precise centering in the radial arrangement of the bolts.
  • the collar is non-circular and is held laterally by flange parts.
  • This measure has the advantage that twisting of the bolts in the assembled state can be ruled out. This is also useful for adjusting the ring part with respect to the position of the free ends of the bolts to the axis of symmetry of the first ring part.
  • the elements are designed as balls which are held in the circumferential direction of the grinding wheel by the ring part designed as a cage and which bear on the one hand on the circumferential surface and on the other hand on the inner circumference.
  • This measure has the advantage that only a rolling friction occurs between the machine parts to be centered on one another during centering. A certain axial movement in the centered state is also possible.
  • the balls also roll under tension so that the grinding wheel can follow the clamping. Furthermore, the grinding wheel can be removed without loosening the centering.
  • bilateral contact of the balls on the peripheral surface and on the inner circumference is advantageous that radial positioning of the balls is not necessary.
  • two flange parts enclose the body on both sides.
  • This measure has the advantage that it is possible to cover the centering elements, for example the first ring part, so that contamination and thus problems during dismantling and subsequent reassembly can be reliably avoided.
  • the flange parts are connected to one another by means of first axial screws in order to hold the body in a force-locking manner and the first screws protrude through first elongated holes of the first ring part which extend in the circumferential direction.
  • This measure has the advantage that the body can be held non-positively in a large circular ring surface by tightening the first screws, which prevents unintentional twisting of the body between the flange parts.
  • the first elongated holes in the first ring part it can also be achieved that all assembly and adjustment elements of the grinding wheel according to the invention are located in a limited circumferential area of the flange parts, so that, moreover, there is sufficient space for providing the receiving openings and for forming the driving surfaces of the flange parts on the body is made available.
  • first ring part is provided with holding means, in particular bores, which enable the first ring part to be rotated in the circumferential direction by means of a tool.
  • this flange part is preferably provided with second elongated holes extending in the circumferential direction, which open access to the holding means in the first ring part.
  • the above-mentioned measures have the advantage that the first ring part can be rotated in a particularly simple manner by providing a suitable tool which, for example, engages through the second elongated holes in the holding means, for example the bores, of the first ring part in order to be able to do this To be able to rotate the first ring part enclosed between the flange parts in the circumferential direction.
  • the tool required for this can be designed, for example, in the manner of a motor vehicle steering wheel which is provided on the side facing away from the user with a rod which runs radially through the axis of symmetry of the steering wheel and which carries two or more axially projecting pins with which through the second elongated holes can be engaged in the holes in the first ring part.
  • the first ring part between the two flange parts can then be rotated in the circumferential direction, so that the elements, that is to say the bolts or the balls, come into contact with the polygonal peripheral surface of the first flange part or the inner circumference of the body.
  • the peripheral surface of the first flange part has the cross-sectional shape of a polygon, the number of corners of which is a multiple of three .
  • the polygon is a so-called constant thickness, as described and defined in detail in DIN 32711. With such a constant thickness, the diameter is known to be of equal length at all points of the polygon, so that a particularly uniform force distribution is achieved when torque is transmitted via the polygon connection.
  • the number of bolts or balls or other radially projecting elements does not necessarily have to be equal to the number of corners of the polygon, but rather can also correspond to the number of corners of the polygon in that e.g. in the case of a hexagonal polygon, only every second side of the polygon is provided with a total of three bolts or balls, or in the case of a pentagonal polygon likewise only every other side of the polygon with consequently six balls or bolts.
  • axially acting elastic braking means are provided on a flange part, which act between the flange part and the body.
  • This measure has the advantage that when the first ring part is rotated for self-centering of the body on the first flange part, a turning of the body is avoided because the body is locked in the circumferential direction on the flange part in question by means of the braking means mentioned.
  • the elastic means e.g. by the spring force, the grinding wheel for axial contact with the first flange part.
  • the braking means have a second ring part which projects axially over the flange part under spring force.
  • This measure has the advantage that a particularly good braking effect is achieved because the second ring part abuts the body over the entire circumference and brakes the body via an adjustable spring force, even if the two flange parts are still held against one another with a certain amount of looseness To allow turning of the first ring part at all.
  • Fig. 1 designates a grinding wheel as it is used in numerically controlled grinding machines.
  • the grinding wheel 10 has an axis of symmetry 11.
  • a disk-shaped body 12 which can be made of metal, for example, is provided on its periphery with a bent end 13, which in turn is provided with a circumferential abrasive material 14.
  • the trim 14 is preferably made of CBN (Cubic Boron Nitride).
  • a flange arrangement which encloses the disk-shaped body 12 on both sides between them.
  • the flange arrangement comprises a first flange part 20 as the main flange and a second flange part 21 as the counter flange.
  • the main flange rests on the left flat side of the disk-shaped body 12 in FIG. 1 and passes through a central opening in the disk-shaped body 12 (not shown in more detail in FIG. 1) and a further such central opening in the second flange part 21, which acts as a counter flange, which flat disc-shaped body 12 from the right side in Fig. 1 holds.
  • the flange parts 20, 21 are screwed together by means of axially extending screws, as will be explained further below. In this way, they hold the disk-shaped body 12 in a force-fitting manner between them, with positive entrainment possibly being additionally provided.
  • a central receiving opening 22 passes through the first flange part 20 in the direction of the axis 11.
  • the receiving opening 22 is conical in a manner known per se and is complementary to a conventional holding mandrel 23 of a grinding machine, which is also indicated extremely schematically in FIG. 1.
  • the disc-shaped body 12 has a cylindrical inner circumference 30.
  • the body 12 sits on a first ring part 31, which has a toroidal shape.
  • the first ring part 31 is provided with a plurality of radial bolts 32 at positions distributed over its circumference, of which only one is shown in FIG. 2 for the sake of clarity.
  • the radial bolts 32 project radially towards the axis 11 beyond the first ring part 31 and must be dimensioned exactly in length.
  • a collar 33 prevents the bolts 32 from falling out.
  • the first flange part 20 is provided with a circumferential surface 34 which has the cross-sectional shape of a polygon in a radial plane, as can be clearly seen from the dashed course in FIG. 2.
  • the shape of the peripheral surface 34 can be chosen so that a triangular polygon according to DIN 32711 is created, for example a so-called P3G profile, which is referred to in technical terms as "constant thickness" because its diameter for all angles of the diameter to a reference Coordinate system has the same length.
  • the first ring part 31 is provided with three radial bolts 32, which are staggered at 120 ° intervals around the circumference of the first ring part 31.
  • a square polygon e.g. is standardized in DIN 32711
  • four radial bolts 32 would have to be arranged by 90 ° over the circumference of the first ring part 31.
  • the peripheral surface 34 is formed on a radial shoulder 35 of the first flange part 20.
  • the first ring part 31 can thus be supported to the left against the first flange part 20, while a separate retaining ring 36 is provided for support to the right, which is screwed to the radial shoulder 35, as with 37 in FIG. 2 indicated.
  • their collars 33 are non-circular, for example cuboid, and are held laterally by the first flange part 20 or by the retaining ring 36 along straight contact surfaces, so that the collars 33 and thus the radial bolts 32 are in contact cannot twist.
  • the first ring part 31 can be centered on the first flange part 20 in a simple manner in that these two parts 31, 20 are rotated relative to one another.
  • the bundles 33 of the radial bolts 32 then come into contact with the polygonal peripheral surface 34, the number of radial bolts 32 corresponding to the number of corners of the polygon and their uniform distribution
  • the known self-centering of polygon connections occurs over the circumference of the first ring part 31.
  • the collars 33 rest against the polygonal peripheral surface 34, the axes of the first ring part 31 and the first flange part 20 coincide, specifically in the axis 11 of the grinding wheel 10.
  • FIG. 4 shows in connection with FIG. 2 a first screw 40, which extends in FIG. 4 from the right from a first blind bore 41 in the second flange part 21 through a first elongated hole 42 in the first ring part 31 into a threaded bore 43 in the first flange part 20 .
  • the first screw 40 serves to clamp the flange parts 20, 21 against one another and a plurality of such first screws 40, for example nine such first screws 40, are provided in order to achieve a large surface pressure between the flange parts 20, 21 and the disk-shaped body 12.
  • the first ring part 31 can still be rotated in the circumferential direction to an extent that is predetermined by the length of the first elongated holes 42, as can be clearly seen from FIG. 2.
  • a second screw 44 is provided, which sits in a second blind hole 45 of the second flange part 21 and which at its free end in a second ring 46, which acts as a brake ring , is screwed in.
  • the second ring 46 is spring-loaded by means of a spring 47 in such a way that in the unmounted state and in the loose state of the flange parts 20, 21 the second ring 46 projects slightly beyond the left radial surface of the second flange part 21 in FIG. 4.
  • the second ring 46 acting as a brake ring presses against the body 12 and fixes it in the axial direction and in the circumferential direction relative to the first flange part 20, but the first ring part 31 can still be twisted. However, the body 12 then does not rotate as desired because it is fixed by the second ring 46.
  • a plurality of second screws 44 with springs 47 are arranged distributed over the circumference of the second flange part 21, for example three such second screws 44 distributed over 120 ° each.
  • the first ring part 31 is encapsulated between the flange parts 20, 21, as can be seen from the above description. To be the first by external intervention To be able to rotate ring part 31, an arrangement is provided according to the invention as shown in FIGS. 2 and 5.
  • the second flange part 21 is provided with a second elongated hole 50 which is aligned with a bore 51 in the first ring part 31.
  • a second elongated hole 50 which is aligned with a bore 51 in the first ring part 31.
  • two such second elongated holes 50 are provided with bores 51, which are diametrically opposed to the axis 11 on the first ring part 31.
  • the first ring part 31 can be easily rotated in its essentially encapsulated position between the flange parts 20, 21.
  • the tool suitable for this can be designed, for example, in the manner of a motor vehicle steering wheel which is provided on its rear side facing away from the user with a bar which runs radially through the axis of the steering wheel and is provided with two axially extending pins 52 at diametrically opposite positions.
  • the steering wheel-shaped tool is now placed in the view of FIG. 5 from the right onto the loosely mounted grinding wheel 10, the first screws 40 of which are only tightened to such an extent that the second ring part 46 exerts its braking action.
  • the first ring part 31 is now rotated in the manner described until the collars 33 come to rest on the peripheral surface 34. In this position, the first screws 40 are now tightened and the flange parts 20, 21 are firmly clamped together, including the disk-shaped body 12.
  • the body 12 can of course also be provided with a polygonal shape on its inner circumferential surface if the circumferential surface 34 of the first flange part 20 is then provided with radial projections, for example the radial bolts 32 in a corresponding arrangement .
  • first screws 40 do not necessarily have to pass through the first ring part 31, but that, with sufficient structural space, the first screws 40 can also be attached in a different radial position of the grinding wheel 10.
  • any other form-fitting connection can also be provided for rotating the first ring part 31, in which, for example, axial pins which are rigidly connected to the first ring part 31 protrude outward beyond the second flange part 21.
  • the grinding wheel 60 corresponds to the arrangement with regard to its formation around the axis of rotation 61 with its disk-shaped body 62, as explained in detail above with reference to FIGS. 2 and 3.
  • a first flange part 70 is provided as the main flange and a second flange part 71 as a counter flange, which enclose a receiving opening 72.
  • the second flange part 71 essentially performs the function of a cover in order to protect the centering means, which will be explained further below, against dirt during operation of the grinding wheel 60.
  • the second flange part 71 is provided with seals 73, 74 with which it rests on the disk-shaped body 62 or on the first flange part 70. Screws 75, with which the second flange part 71 is fastened to the disk-shaped body 62, are shown in FIG. 7.
  • the disk-shaped body 62 rests with its inner circumference 80 on a circumferential surface 84 of the first flange part 70 via a ball bearing consisting of a cage 81 and balls 82, it being understood that three balls would also be sufficient.
  • the peripheral surface 84 of the first flange part 70 is designed as a twelve-sided figure, in which six polygon sides with a large radius of curvature alternate in pairs with six circular arcs of the circular surface from which the polygon sides were worked out.
  • the six balls 82 rest on the polygon sides, which also each extend over a larger circumferential section.
  • the inner circumference 80 of the disk-shaped body 62 has an inner cylindrical shape.
  • the disc-shaped body 62 is screwed directly onto the first flange part 70 by means of screws 90, of which six can be arranged distributed over the circumference, for example.
  • the cage 81 is provided with bores 101 at two diametrically opposite positions, which can be seen in FIG. 6. These bores 101 serve to grasp the cage 81 with a tool and to be able to rotate it relative to the first flange part 70 and to the disk-shaped body 62.
  • the first flange part 70 is placed with its left end face in FIG. 7 on a horizontal base, so that the axis 61 runs vertically.
  • the disk-shaped body 62 is then placed on the first flange part 70 from above and pre-centered on a circumferential shoulder 102 which can be seen in FIG. 7.
  • the screws 90 are loosely screwed in but not yet tightened.
  • the cage 81 with the balls 82 is then inserted into the annular groove which is left free between the disk-shaped body 62 and the first flange part 70.
  • the tool which has already been explained above and is preferably designed in the manner of a steering wheel, is then inserted with its pins into the bores 101 and the cage 81 with the balls 82 is rotated in the circumferential direction until the balls 82 jam between the circular cylindrical circumference 80 and the polygonal circumferential surface 84. This is noticeable on the tool through a noticeable resistance.
  • the screws 90 are now tightened with a torque wrench and finally the second flange part 71 is installed as a sealing ring.
  • roller bearing can also be used instead of the ball bearing 81, 82.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
EP88121444A 1987-12-23 1988-12-22 Schleifscheibe Expired - Lifetime EP0321970B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3743810 1987-12-23
DE3743810 1987-12-23
DE3823591A DE3823591A1 (de) 1987-12-23 1988-07-12 Schleifscheibe
DE3823591 1988-07-12

Publications (3)

Publication Number Publication Date
EP0321970A2 EP0321970A2 (de) 1989-06-28
EP0321970A3 EP0321970A3 (en) 1990-05-30
EP0321970B1 true EP0321970B1 (de) 1992-04-29

Family

ID=25863157

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88121444A Expired - Lifetime EP0321970B1 (de) 1987-12-23 1988-12-22 Schleifscheibe

Country Status (4)

Country Link
US (1) US4907375A (enExample)
EP (1) EP0321970B1 (enExample)
JP (1) JPH01216775A (enExample)
DE (2) DE3823591A1 (enExample)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4129090A1 (de) * 1991-09-02 1993-03-04 Rueggeberg August Fa Schleifscheibe
GB9401395D0 (en) * 1994-01-25 1994-03-23 Western Atlas Uk Ltd Positive radial location of wheels on shafts
DE19650623A1 (de) * 1996-12-06 1998-06-18 Naxos Union Schleifmittel Werkzeugaufnahme
DE19860403B4 (de) * 1998-12-28 2004-03-25 Wilhelm Fette Gmbh Anordnung aus Wälzfräskörper und Aufnahmedorn
GB2445025B (en) * 2006-12-21 2011-10-26 Cinetic Landis Grinding Ltd Grinding surfaces of workpieces
JP5954119B2 (ja) * 2012-10-31 2016-07-20 日本精工株式会社 ねじ研削盤における砥石の芯出し方法、及び、芯出し用の測定装置
CN104191368B (zh) * 2014-09-05 2016-08-17 郑州磨料磨具磨削研究所有限公司 一种点接触式精密校正砂轮的方法及机构

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2675653A (en) * 1954-04-20 Device fok truing face grinding
US2841929A (en) * 1956-12-26 1958-07-08 Super Cut Truing device for peripheral type grinding wheels
DE3322258C1 (de) * 1983-06-21 1984-06-28 Erwin 7611 Nordrach Junker Spannvorrichtung für einen Schleifring
EP0132567B1 (de) * 1983-06-21 1987-05-20 Erwin Junker Spannvorrichtung für einen Schleifring
DE3405556C1 (de) * 1984-02-16 1985-09-05 Erwin 7611 Nordrach Junker Spannvorrichtung für einen Schleifring
JPS61226271A (ja) * 1985-03-29 1986-10-08 Mitsubishi Metal Corp 研削砥石

Also Published As

Publication number Publication date
DE3823591C2 (enExample) 1991-06-13
DE3870598D1 (de) 1992-06-04
EP0321970A3 (en) 1990-05-30
JPH01216775A (ja) 1989-08-30
DE3823591A1 (de) 1989-07-06
US4907375A (en) 1990-03-13
EP0321970A2 (de) 1989-06-28

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