EP4292758A1 - Dispositif pour l'usinage par meulage d'une ébauche de disque - Google Patents

Dispositif pour l'usinage par meulage d'une ébauche de disque Download PDF

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Publication number
EP4292758A1
EP4292758A1 EP23020250.9A EP23020250A EP4292758A1 EP 4292758 A1 EP4292758 A1 EP 4292758A1 EP 23020250 A EP23020250 A EP 23020250A EP 4292758 A1 EP4292758 A1 EP 4292758A1
Authority
EP
European Patent Office
Prior art keywords
grinding
axis
disk blank
blank
rotation
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
EP23020250.9A
Other languages
German (de)
English (en)
Inventor
Günter Hacker
Markus Aschauer
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.)
Gst Grinder GmbH
Original Assignee
Gst Grinder 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 ATA158/2022A external-priority patent/AT526072B1/de
Application filed by Gst Grinder GmbH filed Critical Gst Grinder GmbH
Publication of EP4292758A1 publication Critical patent/EP4292758A1/fr
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
    • B24B7/10—Single-purpose machines or devices
    • B24B7/16—Single-purpose machines or devices for grinding end-faces, e.g. of gauges, rollers, nuts, piston rings
    • B24B7/17—Single-purpose machines or devices for grinding end-faces, e.g. of gauges, rollers, nuts, piston rings for simultaneously grinding opposite and parallel end faces, e.g. double disc grinders
    • 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
    • B24B27/00—Other grinding machines or devices
    • B24B27/0023—Other grinding machines or devices grinding machines with a plurality of working posts
    • 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
    • B24B27/00—Other grinding machines or devices
    • B24B27/0069—Other grinding machines or devices with means for feeding the work-pieces to the grinding tool, e.g. turntables, transfer means
    • 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
    • B24B27/00—Other grinding machines or devices
    • B24B27/0076—Other grinding machines or devices grinding machines comprising two or more grinding tools

Definitions

  • the invention relates to a device for processing a disc blank by grinding.
  • the present invention can be used particularly advantageously for the production of brake discs. In principle, however, it can be used for producing a more comprehensive group of products, in particular for annular disc-like products. Without restricting the invention to this, it will be described in the following text, preferably using the particularly valuable application example “brake disc”.
  • a brake disc in the sense of this document is a flat, essentially rotationally symmetrical structure which, when used as intended, is arranged on a rotatable wheel so that it rotates with it and, in order to brake the rotational movement, is subjected to pressure on both end faces eccentrically with respect to the axis of rotation by non-rotating brake shoes, so that A frictional force occurs between the brake disc and brake shoes.
  • high-quality brake discs usually consist of a composite of a metallic core and a coating made of a material that has a higher abrasion resistance than the core material.
  • the coating is usually a material composite which, among other substances, contains, for example, ceramic particles and/or metal-like carbides and/or very strong fibers.
  • Such coatings on brake discs are intended to be better abrasion-resistant than steel or cast iron, but are very difficult to machine.
  • the production of a brake disc having such a coating includes a work step in which material is removed from said coating by a grinding process in order to form surfaces whose dimensions and flatness meet the precision requirements meet the intended friction surfaces of the brake discs.
  • the disc blank and two grinding discs are driven to rotate about their respective axes, the two grinding discs being rotated about a common axis of rotation, which is parallel to the axis of rotation of the disc blank is aligned.
  • the two grinding wheels each have one of their two end faces in grinding engagement with one end face of the grinding wheel.
  • the throughput number that can be achieved with these devices is more limited than with devices in which grinding wheels are in contact with their lateral surface with the disk blank to be processed.
  • the writings US 4262452 A , DE 102019128522 A1 , US 5607348 A , DE 2343949 A1 , EP 0768147 A1 and US 2122978 A show devices for the grinding processing of rotating disk blanks using two rotating grinding disks, in which the grinding disks are in contact with their lateral surface with an end face of the disk blank. Thereby lie according to the scriptures DE 102019128522 A1 , US 5607348 A , DE 2343949 A1 , EP 0768147 A1 and US 2122978 A the axes of rotation of the grinding wheels are parallel to the plane of rotation of the disk blank.
  • the axes of the grinding disks are not parallel to the plane of rotation of the disk blank being processed, but are inclined at a small acute angle to this plane in such a way that on the side of the grinding disks the ration axis of the disk blank increases as the radial distance to the axis of rotation of the disk blank increases between the two axes of rotation of the grinding wheels increases relative to each other.
  • the task on which the present invention is based is to create a device for the grinding processing of a disk blank using two rotating grinding disks, in which the grinding disks are each in grinding contact with the lateral surface on one end face side of the disk blank. Compared to the devices of this type discussed, the new device is intended to be improved in such a way that it enables a higher throughput under comparable conditions.
  • Fig. 1 Shows a highly stylized representation of a system according to the invention.
  • the device shown has the following features in common with the devices according to the prior art: Both end faces of the disc blank 1 being processed are processed simultaneously. Two annular grinding wheels 2 are used, which are driven to rotate about their respective axis 3 and are each in contact with their lateral surface with one of the two end faces of the disk blank 1 and grind material from the contact surface. The disk blank 1 is also driven to rotate about its axis 4. With respect to this axis 4 of the disc blank 1, the two contact surfaces between the disc blank 1 and the two grinding discs 2 lie on the same circumferential coordinate and on the same radial coordinate.
  • the two grinding wheels 2 are each held by a device called a grinding spindle 5 and driven to rotate about their axis 3.
  • the two grinding spindles 5 are held displaceably on a linear guide 6 parallel to the axis 4 of the disk blank 1 being processed.
  • the contact surfaces can be kept very small - and linearly narrow - so that it is comparatively easy to prevent the disk blank 1 from overheating of the grinding wheels 2.
  • the two grinding wheels 2 come from exactly opposite sides During the grinding process, press it against the disc blank 1 being processed, this disc blank 1 is not or hardly subjected to bending stresses, which makes it comparatively easy to work without deformation, vibration-free and with high precision.
  • the axes 3 of the grinding wheels 2 are not parallel to the plane of rotation of the disk blank 1 being processed, but rather they are inclined to this plane at a small acute angle (less than 30°, typically about 5°) in such a way that on the side of the grinding wheels 2 of the axis 4 of the disk blank 1, the distance between the two axes 3 of the grinding wheels 2 decreases as the distance to the axis 4 increases.
  • the lateral surface of the relevant grinding wheel 2 is not a circular cylindrical lateral surface, but a truncated cone lateral surface.
  • the two axes 3 of the grinding wheels 2 do not lie in a common plane that is normally aligned with the plane of rotation of the disk blank 1 being processed, but are pivoted in opposite directions by a few degrees of angle (maximum 15 °) with respect to such a plane.
  • This means that the two straight lines in which the axes of rotation of the two grinding disks lie do not intersect the axis 4 of the disk blank 1, but rather they pass it on radially opposite sides.
  • the distance to axis 4 is preferably the same for both of these straight lines. (The distance between two straight lines that do not cross each other and are not parallel to each other is equal to the length of the connecting line between the two straight lines, which is at right angles to both straight lines.)
  • the measure according to the further development b) according to the invention ensures that shock-like force loads on the grinding wheels 2, which are caused by fluctuations in thickness or by local fluctuations in the stability of the disk blank 1, are not as severe as if the contact surfaces of the two grinding disks 2 were parallel to one another would be aligned. This avoids vibrations, saves calibration processes on the grinding wheels 2 and improves the service life of the grinding wheels 2.
  • the two axes 3 of the two grinding wheels 2 are opposite a plane in which lies the axis 4 of the disc blank 1, is inclined equally in opposite directions, with the centers of the two contact surfaces of the two grinding discs 2 with the disc blank also preferably lying in said plane. This means that the best possible balance of forces can be achieved with regard to the forces exerted by the two grinding wheels 2 on the disk blank 1 in its radial direction.
  • the device has two workpiece spindles 7, 8, both of which are arranged on a pivotable feed device 9. Due to the pivotability of the feed device 9, one or the other of the two workpiece spindles 7, 8 can be pivoted into the position in which the disk blank 1 arranged on it can be processed.
  • a part 10 located there on the second workpiece spindle (8) which was created by grinding a disk blank 1 according to the invention, can be removed without loss of time and then another disc blank that still needs to be processed can be mounted.
  • the removal or assembly can typically be done by a robot or another automatically operating device.
  • the measure according to the further development c) according to the invention ensures that the time for changing the workpieces hardly causes any breaks in the grinding processes.
  • a dressing unit 11 is also mounted on the delivery device 9. This consists (as is known) of a dressing wheel and a holding and drive unit that holds it and drives it to rotate.
  • the dressing unit 11 is used to measure the working surfaces of the grinding wheels 2 after a fixed number of work cycles and to recalibrate or sharpen them by removing material.
  • the delivery device 9 can be displaced normal to the direction of the axis 4 of the disk blank 1 being processed by a further linear guide 12.
  • the workpiece spindles 7, 8 and the dressing unit 11 that may also be arranged thereon can be displaced by the further linear guide 12 normal to the direction of the axis 4 of the disc blank 1 being processed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
EP23020250.9A 2022-06-15 2023-05-25 Dispositif pour l'usinage par meulage d'une ébauche de disque Pending EP4292758A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT600892022 2022-06-15
ATA158/2022A AT526072B1 (de) 2022-06-15 2022-08-08 Vorrichtung für das Bearbeiten eines Scheibenrohlings durch Schleifen

Publications (1)

Publication Number Publication Date
EP4292758A1 true EP4292758A1 (fr) 2023-12-20

Family

ID=86609473

Family Applications (2)

Application Number Title Priority Date Filing Date
EP23020249.1A Pending EP4292757A1 (fr) 2022-06-15 2023-05-25 Dispositif pour l'usinage par meulage d'une ébauche de disque
EP23020250.9A Pending EP4292758A1 (fr) 2022-06-15 2023-05-25 Dispositif pour l'usinage par meulage d'une ébauche de disque

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP23020249.1A Pending EP4292757A1 (fr) 2022-06-15 2023-05-25 Dispositif pour l'usinage par meulage d'une ébauche de disque

Country Status (1)

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EP (2) EP4292757A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2122978A (en) 1936-04-18 1938-07-05 Howard B Eldridge Machine for grinding clutch facings and the like
US3448504A (en) * 1965-12-04 1969-06-10 Hegenscheidt Kg Wilhelm Surface smoothing arrangement
US3866281A (en) * 1973-09-10 1975-02-18 Hegenscheidt Gmbh Wilhelm Surface smoothing arrangement
DE2343949A1 (de) 1973-08-31 1975-03-20 Paul Erich Kettler Einrichtung zum glaetten der bremsscheiben von scheibenbremsen an kraftfahrzeugen im eingebauten zustand der bremsscheibe
US4262452A (en) 1978-11-24 1981-04-21 Lopez Francisco R Disc brake grinding apparatus and method
US5607348A (en) 1995-06-07 1997-03-04 Lopez; Francisco R. Disc brake grinding apparatus and method
EP0768147A1 (fr) 1995-10-11 1997-04-16 Tahay, Benoít Rectifieuse pour disque de freins
DE102019128522A1 (de) 2019-10-22 2021-04-22 J.G. WEISSER SöHNE GMBH & CO. KG Werkzeugmaschine zum Schleifen von Werkstücken, insbesondere von Bremsscheiben

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2122978A (en) 1936-04-18 1938-07-05 Howard B Eldridge Machine for grinding clutch facings and the like
US3448504A (en) * 1965-12-04 1969-06-10 Hegenscheidt Kg Wilhelm Surface smoothing arrangement
DE2343949A1 (de) 1973-08-31 1975-03-20 Paul Erich Kettler Einrichtung zum glaetten der bremsscheiben von scheibenbremsen an kraftfahrzeugen im eingebauten zustand der bremsscheibe
US3866281A (en) * 1973-09-10 1975-02-18 Hegenscheidt Gmbh Wilhelm Surface smoothing arrangement
US4262452A (en) 1978-11-24 1981-04-21 Lopez Francisco R Disc brake grinding apparatus and method
US5607348A (en) 1995-06-07 1997-03-04 Lopez; Francisco R. Disc brake grinding apparatus and method
EP0768147A1 (fr) 1995-10-11 1997-04-16 Tahay, Benoít Rectifieuse pour disque de freins
DE102019128522A1 (de) 2019-10-22 2021-04-22 J.G. WEISSER SöHNE GMBH & CO. KG Werkzeugmaschine zum Schleifen von Werkstücken, insbesondere von Bremsscheiben

Also Published As

Publication number Publication date
EP4292757A1 (fr) 2023-12-20

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