EP0327569A1 - Agencement de disque abrasif pour ponceuse a vitesse de rotation elevee - Google Patents

Agencement de disque abrasif pour ponceuse a vitesse de rotation elevee

Info

Publication number
EP0327569A1
EP0327569A1 EP19870907105 EP87907105A EP0327569A1 EP 0327569 A1 EP0327569 A1 EP 0327569A1 EP 19870907105 EP19870907105 EP 19870907105 EP 87907105 A EP87907105 A EP 87907105A EP 0327569 A1 EP0327569 A1 EP 0327569A1
Authority
EP
European Patent Office
Prior art keywords
grinding wheel
arrangement according
wheel arrangement
positioning body
grinding
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.)
Pending
Application number
EP19870907105
Other languages
German (de)
English (en)
Inventor
Klaus Dittmann
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.)
Guehring Automation GmbH
Original Assignee
Guehring Automation 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
Priority claimed from DE19863635973 external-priority patent/DE3635973A1/de
Priority claimed from DE19873734834 external-priority patent/DE3734834C2/de
Application filed by Guehring Automation GmbH filed Critical Guehring Automation GmbH
Publication of EP0327569A1 publication Critical patent/EP0327569A1/fr
Pending legal-status Critical Current

Links

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
    • B24B45/00—Means for securing grinding wheels on rotary arbors

Definitions

  • the invention relates to a grinding wheel arrangement, in particular for high-speed grinding using a grinding wheel with an invariable profile, according to the preamble of patent claim 1.
  • High-speed grinding wheels with an invariable profile are being used more and more frequently in the course of recent technical development because they are far superior to conventional grinding wheels in terms of tool life and cutting performance.
  • discs come for example Borazon disks, ie boron nitride (CBN) disks or diamond disks are used, the diameter of such disks being able to be over 500 mm for a working width of up to 200 mm.
  • CBN boron nitride
  • the invention is therefore based on the object to provide a grinding wheel arrangement for high-speed grinding machines, which is a more economical one set of grinding wheels with an invariable profile.
  • the clamping process of a grinding wheel is expanded by an additional work step, namely the alignment of the grinding wheel, which is preferably only formed by a slip ring.
  • the grinding wheel can thus be set in the grinding machine independently of the manufacturing tolerances of the clamping system in such a way that optimal cutting conditions are ensured on the grinding wheel.
  • the invention is based on the knowledge that it is crucial for the service life of such high-speed grinding wheels that the load on the grinding surface is as uniform as possible over the circumference. In the case of grinding wheels of this type, only a so-called “single-grain coating” is provided, the grain size being approximately in the range between 100 and 300 ⁇ m, in individual cases even at 3 ⁇ m.
  • An advantageous embodiment of the grinding wheel arrangement is the subject of patent claim 2.
  • the alignment accuracy of the grinding wheel can be additionally increased.
  • the face surface pairing is easier to keep free of contamination than a conventional cone surface pairing, so that a decisive source of error when replacing such high-speed grinding wheels can be eliminated.
  • the device according to the invention not only has the advantage of low susceptibility to malfunctions when replacing the grinding wheel, but it is also distinguished by the fact that the grinding wheel becomes considerably more manageable, which is advantageous not only during the replacement process itself, but also with regard to transport and manufacturing costs .
  • Another advantage of this development of the grinding wheel arrangement is the fact that the axial position of the grinding wheel profile when changing not - as is the case with conventional cone clamping systems
  • each positioning body is assigned a diametrically arranged counter-positioning body. In this way it can be ensured that when a positioning body is actuated, the grinding wheel is displaced more precisely than is the case, for example, with three positioning bodies, so that the setting process can be accelerated.
  • the support surface can be designed differently from the geometry.
  • the configuration according to claim 6 is particularly simple and therefore economical.
  • the inventive design of the clamping device opens up the possibility of making the grinding wheel much simpler and easier.
  • the measures according to the invention make it possible to prepare only the carrier flange with regard to any balancing work that may be required, as a result of which the grinding wheel is additionally simplified and its production becomes more economical.
  • Due to the reduced mass of the grinding wheel only a few positioning bodies are sufficient to hold the grinding wheel, once centered, in position when the clamping screws are tightened.
  • additional bracing means for example according to claim 17, twelve additional positioning bodies having proven to be advantageous for minimizing the sources of unbalance.
  • the high-speed grinding wheel is usually seated on a projecting shaft journal of the grinding spindle, so that an end face of the grinding wheel is freely accessible radially outside of a fastening nut.
  • Any actuating gear can be provided for this purpose.
  • the function described above is further supported by the drip groove contributes to the fact that grinding sludge running from the outside inwards is deposited in such a way that it can be flung radially outwards after the start-up.
  • a particularly simple and reliable device for aligning the grinding wheel in the grinding machine is the subject of claims 24 to 29.
  • This device is not only characterized by the fact that the force flow from the carrier flange to the siphon ring is particularly favorable, but it also advantageously creates the possibility that the number of components required can be reduced considerably. This is possible with just four blocks to work, in which a maximization of the support surfaces for the carrier flange on the one hand and a radially inner contact surface of the grinding wheel on the other hand is possible in a simple manner.
  • FIG. 1 shows a radial section through a grinding spindle with a clamped grinding wheel
  • FIG. 2 shows a partial sectional view of the embodiment according to FIG. 1 with a section along the line II-II
  • FIG. 3 shows an enlarged view of detail III in FIG. 1,
  • FIG. 4 shows a partial sectional view of a further embodiment of the grinding wheel arrangement
  • FIG. 5 shows a sectional view of the positioning body used in the embodiment according to FIG. 4, and
  • Figure 6 is a view according to "VI" in Figure 5.
  • reference number 2 denotes a grinding spindle which has a clamping cone 4.
  • a grinding wheel carrier flange is fastened via a fastening nut 6, which is screwed onto a threaded pin 8, and has a radial shoulder part 12 for forming a flat surface 14.
  • the carrier flange 10 carries a grinding wheel 16 which is designed as a high-speed grinding wheel with an invariable profile.
  • the grinding wheel is formed by a metallic body, a Borazon, d. H. has a CBN (cubic boron nitride) storage area 18.
  • the grinding wheel 16 is designed as a high-speed grinding wheel and has essentially the shape of a rectangular ring, a front radial surface 20 and a rear radial surface 22 connecting to the CBN surface part 18.
  • the inner ring surface as the inner axially extending surface is designated by 24.
  • the grinding wheel In the axial run-up to the grinding wheel axis or to the CBN surface, the grinding wheel itself has a flat surface 26 which is in functional contact with the flat surface 14 of the radial shoulder part 12. Via the plane surfaces 14 and 26 the clamping of grinding wheel 16 and carrier flange 10 and thereby driving the grinding wheels.
  • a plurality of clamping screws 28 serve as clamping means, the shafts of which are accommodated with play in through bores 30 of the grinding wheel 16.
  • the head 32 of the clamping screw 28 is seated in a countersink or in an annular groove 34 and is supported on a shoulder of the bore 30 via a washer 35.
  • each positioning body 36 has at its radially inner end a beveled surface 38 which is supported flatly on a likewise beveled surface 40 of a pressure bolt 42.
  • the positioning body 36 is aligned in the radial direction, whereas the pressure pin 42 runs in the axial direction.
  • the axes 42 and 36 lie in common axial planes E Ax , so that the beveled surfaces 38 and 40 run at an angle of 45 ° to the respective central axis.
  • the positioning body 36 and the pressure pin 42 are preferably formed by cylindrical pins which are received in bores 44 and 46 with a fit.
  • the actuating gear for the positioning body 36 is driven via adjusting screws 48, which are equipped with a fine thread.
  • the actuation of these screws takes place, for example, via an internal hexagon recess 50, which is formed via an annular groove 52 in an end face 54 of the carrier flange 10.
  • the annular groove 52 also serves to accommodate balancing stones, not shown.
  • a cover ring 56 ensures that grinding sludge penetrates into the annular groove 52. In a similar manner, such a cover ring can also be provided in the area of the heads 32 of the clamping screws 28.
  • a gap 60 which extends in the axial direction is provided between the annular support surface 24 of the grinding wheel 16 and an outer ring surface 58 of the carrier flange 10 (see FIG. 2) narrowest width W min from approx. 0.2 to 0.3 mm.
  • the positioning body 36 bridge this gap, so that the radial support takes place exclusively via the positioning body 36.
  • the positioning bodies 36 are cylindrically shaped or ground at their radially outer ends, so that they nestle flatly against the inner diameter or against the support surface 24.
  • each positioning body 36 has a longitudinal groove 64 on the side facing a rear end face 62, into which cylindrical pins 66 of a fixing screw 68 engage.
  • high speed grinding wheels are caused by the high speed relatively large outer diameter of over 500 mm, make sure that no new imbalances occur during operation. Unbalances, which already noticeably impair the operating behavior of the high-speed grinding wheels, can already result from the fact that grinding sludge settles on radially outer locations.
  • the clearance 60 at the entrance is designed in a special way, which is shown in detail in FIG. 3.
  • the grinding wheel 16 has a groove 70, so that a projection 72 is formed, on which a drop that forms is reliably detached.
  • a drip groove 74 is formed on the side of the carrier flange 10, in such a way that this groove can catch the drop detaching from the projection 72.
  • the drip groove 74 is offset in the axial direction towards the groove 70.
  • the drip groove 74 is delimited by an annular web 76 on the side facing the end face 54 and on the other side by the outer annular surface 58.
  • the ring web 56 is in this way in front of the front radial surface 20 of the grinding wheel 16, so that detached grinding lubricant is flung past the grinding wheel 16 to the outside when the grinding wheel is set in rotation.
  • the outer ring surface 58 is formed by a conical surface which includes an angle of inclination ⁇ / 2 between 2 ° and 6 ° with the axis of the grinding wheel.
  • This conical surface causes grinding slurry, which is located in the gap 60, to be pressed radially and axially outwards when the grinding wheel rotates in the direction of arrow B in FIG. 3, so that the gap 60 is thus dynamically cleaned.
  • the positioning body 36 is first inserted into the bore 44 and fixed by means of the fixing screws 68 so that they protrude beyond the inner diameter of the grinding wheel 16.
  • the carrier flange 10 is now mounted on a grinding spindle together with the positioning bodies 36.
  • the positioning bodies 36 are then ground to an outer dimension that corresponds to the inner diameter of the grinding wheel 16.
  • the support surface of the positioning body 36 can be made even more precisely if the attachment via the fixing screw 68 only takes place when a firm push connection has been established between the positioning body 36 and the pressure bolt 42.
  • actuating gears consisting of adjusting screw 48, pressure bolt 42 and positioning body 36 for centering the grinding wheel 16, only one such actuating gear being shown in the figures.
  • Two such actuators are arranged diametrically to one another in axial planes E Ax .
  • the axial planes in which the actuating gears are located are preferably perpendicular to one another.
  • further blocking systems are provided which have the same support mechanism as the positioning gears. These locking systems are actuated when the centering of the grinding wheel has been completed in order to additionally support the grinding wheel in the radial direction.
  • the blocking systems are preferably arranged so that the positioning bodies are evenly distributed over the circumference at equal angular intervals.
  • the cover ring 56 is removed. Then the stall screws 48 are loosened. After loosening the clamping screws 28, the grinding wheel can be pulled off the carrier flange 10. The new grinding wheel is now attached and slightly pressed against the flat surface 14 by means of the clamping screws 28. With the help of a dial gauge, which is either with the profile, i.e. The CBN lining 18 or a measuring nose, not shown, can be brought into engagement, the centering is carried out.
  • the four actuating gears which are set at an angle of 90 °, are alternately operated until there are runout deviations below the tolerance limit. Then the identically designed actuating gears of the blocking system are actuated in order to support the grinding wheel radially uniformly. As soon as this has been done, the clamping screws 28 are tightened and the cover rings 56 and the cover ring for the clamping screws 28 are put on.
  • the design of the support surface 24 of the grinding wheel can deviate from a cylindrical surface.
  • Polygonal surfaces can be provided which interact in a form-fitting manner with adapted radial outer surfaces of the positioning bodies 36.
  • the positioning body 36 itself can have a shape that deviates from the cylindrical shape.
  • the fixing screw 68 can be omitted.
  • the angle of the bevel of the pressure bolts can be chosen so that an improved force transmission of the adjusting forces is achieved, although the bevel angle must not be so flat that a self-locking frictional connection occurs between the engagement surfaces of the positioning bodies and the pressure bolts.
  • a carrier flange 110 is in turn clamped on a grinding spindle 102 and has an annular recess 104 in its radially outer region for forming a radial shoulder part 112. In this area, a flat surface 114 is provided for the flat contact of a flat surface 126 of a grinding wheel 116 carried by the carrier flange 110.
  • the grinding wheel 116 is designed as an annular body which is relatively narrow in the radial direction and has a CBN coating 118 which forms the functional cutting surface of the grinding wheel.
  • a clamping screw arrangement is used, which has a plurality of axially extending and preferably uniformly spaced clamping screws 128 for which a threaded bore in the radial shoulder part 112 129 and a bore 130 is provided in the grinding wheel 116.
  • a screw head 132 an annular groove or a shoulder 134 is formed on which an intermediate ring 135 abuts.
  • the slip ring 116 is supported on the carrier flange 110 via four positioning bodies 136 arranged at an angular distance of 90 degrees from one another. For this reason, the ring recess 104 is chosen large enough.
  • the positioning body 136 which - as can be seen in FIG. 6 - have a T cross-section, undercut grooves 138 are formed in the carrier flange 110, which end on a surface 140.
  • a bottom surface of the groove 138 is denoted by 142 - this extends in such a way that it forms a predetermined angle of inclination with an axis 103 of the grinding wheel arrangement.
  • a web 144 of the block-like positioning body 138 has on the side opposite its sliding surface 146 a support surface 148 which can be brought into force-transmitting engagement with a cylindrical support surface 124 of the grinding wheel 116.
  • the respective support surface 148 is formed by the jacket section of a cylinder denoted by 150 in FIG. 5, which with the cylinder 152 producing the support surface 124 of the grinding wheel 116 (see FIG. 4) essentially coincides or is congruent.
  • the axis of this cylinder 150 is set to the sliding surface 146 by the angle of inclination ⁇ explained above.
  • the plane of symmetry 154 of which contains the axis 103 two bores, a stepped through bore 156 and radial, are radially offset outside in the web 144, a threaded hole 158 is introduced.
  • the bores run parallel to the sliding surface 146 with their axes in the plane of symmetry 154.
  • the stepped bore 156 serves to receive a set screw 160, the head 162 of which can be brought into contact with the bore shoulder 164 and whose shaft 166 projects through the bore 156 with play and engages with a threaded part 168 in a corresponding threaded bore 170 in the carrier flange 110.
  • the adjusting screw 160 thus forms with the groove
  • the threaded bore 158 receives a counter screw 172, which can be clamped against the surface 140 when the desired alignment of the grinding wheel 116 has been completed via the actuating gear.
  • the counter screws 172 thus replace the additional positioning bodies provided in the exemplary embodiment described above.
  • a cover plate 174 is provided, with which the entire end face of the carrier flange 110 and the recesses for the screw heads 132 can be shielded from the surroundings.
  • Vary surface area between support surface 124 and positioning body 136 for example to provide a line contact.
  • the actuating gear can also be used if the axial extent of the grinding wheel 116 is reduced.
  • the positioning body must be designed accordingly, for example cranking.
  • Device for aligning the grinding wheel in the grinding machine is not limited to a purely radial alignment. If necessary, the actuating gear is to be varied so that an axial or an axial and radial alignment can take place.
  • the invention thus creates a grinding wheel arrangement, in particular for a high-speed grinding machine, which is equipped with a grinding wheel with an invariable profile.
  • a device is provided with which the cutting furikungs Colour the grinding wheel in the mounted on the grinding wheel spindle can be aligned in the radial and / or axial direction. In this way, the volume of the grinding wheel that cannot be dressed in the machine and the balancing effort after replacing the grinding wheel can be reduced. Due to the alignment in the machine, the cutting forces can be evened out over the circumference of the grinding wheel, which results in increased service life and thus an economical use of such grinding wheels.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Abstract

L'agencement décrit comporte un disque abrasif à profil de forme invariable. Un système permet d'ajuster dans le sens radial et/ou axial et tandis qu'elle est montée sur la broche (2) la surface fonctionnelle (18) d'enlèvement de copeaux de la ponceuse (16). On peut ainsi réduire le volume du disque qui ne peut pas être dressé dans la ponceuse, ainsi que les opérations d'équilibrage après remplacement du disque. Cet ajustement dans la ponceuse permet de répartir uniformément les forces d'enlèvement de copeaux sur la périphérie du disque, d'où une durabilité accrue et un emploi plus rentable de ce type de disque.
EP19870907105 1986-10-22 1987-10-22 Agencement de disque abrasif pour ponceuse a vitesse de rotation elevee Pending EP0327569A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19863635973 DE3635973A1 (de) 1986-10-22 1986-10-22 Vorrichtung zum aufspannen von hochgeschwindigkeitsschleifscheiben
DE3635973 1986-10-22
DE19873734834 DE3734834C2 (de) 1987-10-14 1987-10-14 Vorrichtung zum Aufspannen von Hochgeschwindigkeitsschleifscheiben
DE3734834 1987-10-14

Publications (1)

Publication Number Publication Date
EP0327569A1 true EP0327569A1 (fr) 1989-08-16

Family

ID=25848692

Family Applications (2)

Application Number Title Priority Date Filing Date
EP19870907105 Pending EP0327569A1 (fr) 1986-10-22 1987-10-22 Agencement de disque abrasif pour ponceuse a vitesse de rotation elevee
EP87115523A Withdrawn EP0268104A1 (fr) 1986-10-22 1987-10-22 Dispositif de fixation de meule pour meuleuse à haute vitesse

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP87115523A Withdrawn EP0268104A1 (fr) 1986-10-22 1987-10-22 Dispositif de fixation de meule pour meuleuse à haute vitesse

Country Status (4)

Country Link
EP (2) EP0327569A1 (fr)
JP (1) JPH02500422A (fr)
FI (1) FI891835A0 (fr)
WO (1) WO1988003076A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5885146A (en) * 1995-12-06 1999-03-23 Black & Decker Inc. Oscillating hand tool
US5746647A (en) * 1996-11-12 1998-05-05 China Grinding Wheel Corporation Sleeve flange type mounting device for mounting a grinding wheel on a spindle of a grinding machine
CN100563929C (zh) * 2007-10-22 2009-12-02 杭州机床集团有限公司 卡套式砂轮卡盘
CN101200051B (zh) * 2007-10-22 2010-06-09 杭州机床集团有限公司 新型砂轮卡盘
ITUD20070231A1 (it) * 2007-12-05 2009-06-06 Metal World S P A Dispositivo portautensili
US9796064B2 (en) * 2015-02-19 2017-10-24 GM Global Technology Operations LLC Quick change adapter for grinding wheels

Family Cites Families (3)

* 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
US2846826A (en) * 1957-02-26 1958-08-12 Super Cut Mounting and truing device for peripheral type circular grinding or cutting wheels

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8803076A1 *

Also Published As

Publication number Publication date
WO1988003076A1 (fr) 1988-05-05
EP0268104A1 (fr) 1988-05-25
FI891835A (fi) 1989-04-18
FI891835A0 (fi) 1989-04-18
JPH02500422A (ja) 1990-02-15

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