EP1702716A1 - Machine à meuler - Google Patents

Machine à meuler Download PDF

Info

Publication number
EP1702716A1
EP1702716A1 EP05425152A EP05425152A EP1702716A1 EP 1702716 A1 EP1702716 A1 EP 1702716A1 EP 05425152 A EP05425152 A EP 05425152A EP 05425152 A EP05425152 A EP 05425152A EP 1702716 A1 EP1702716 A1 EP 1702716A1
Authority
EP
European Patent Office
Prior art keywords
supporting member
assembly
axis
fixed supporting
movable supporting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP05425152A
Other languages
German (de)
English (en)
Inventor
Claudio Tacchella
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.)
TACCHELLA MACCHINE SpA
Original Assignee
TACCHELLA MACCHINE SpA
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 TACCHELLA MACCHINE SpA filed Critical TACCHELLA MACCHINE SpA
Priority to EP05425152A priority Critical patent/EP1702716A1/fr
Publication of EP1702716A1 publication Critical patent/EP1702716A1/fr
Withdrawn legal-status Critical Current

Links

Images

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
    • B24B47/00—Drives or gearings; Equipment therefor
    • B24B47/10—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces
    • B24B47/12—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces by mechanical gearing or electric power
    • 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
    • B24B27/0061—Other grinding machines or devices having several tools on a revolving tools box
    • 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
    • B24B37/00—Lapping machines or devices; Accessories
    • B24B37/04—Lapping machines or devices; Accessories designed for working plane surfaces
    • B24B37/042—Lapping machines or devices; Accessories designed for working plane surfaces operating processes therefor
    • 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
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/002—Grinding heads
    • 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
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/04—Headstocks; Working-spindles; Features relating thereto

Definitions

  • the present invention relates to an adjustable grinding tool-holder assembly.
  • Grinding is performed on a grinding machine by producing relative motion between a tool - fitted to the machine and having a highly abrasive work surface - and an inner or outer surface of a workpiece from which material is to be removed.
  • Grinding machines normally comprise tool-holder assemblies for positioning the tool correctly with respect to the workpiece, and are arranged in production lines, along which various grinding operations on respective surfaces of the workpiece are performed successively.
  • an adjustable grinding tool-holder assembly as claimed in Claim 1.
  • number 1 indicates a tool-holder assembly in accordance with the invention for a known grinding machine (not shown in the accompanying drawings).
  • Assembly 1 substantially comprises a base 10 fixed in known manner, e.g. by screws, to the supporting structure of the grinding machine; and a supporting member 2, to which are fitted two or more grinding tools (described in detail below), and which rotates, with respect to base 10 and about an axis A, between a number of tool angular work positions.
  • supporting member 2 is located vertically over base 10, and has a plane of symmetry P containing axis A.
  • Supporting member 2 is moved between the angular work positions by a motor 3 fitted to supporting member 2; and by a transmission 12 fitted partly to supporting member 2 and partly to base 10.
  • supporting member 2 is fitted with two external-grinding tools 5, and one internal-grinding tool 7, which are fitted integrally to respective spindles 4, 6, in turn fitted to supporting member 2.
  • external-grinding tools 5 are fitted to corresponding adjacent end portions of respective spindles 4, coaxially with respective axes B.
  • Axes B of spindles 4 advantageously diverge towards the portions of spindles 4 fitted with external-grinding tools 5, so as to reduce total inertia of assembly 1 and the total adjustment angle of sequentially-operated grinding tools 5, 7 with respect to axis A.
  • Spindle 6 is fitted to supporting member 2 in an axially-fixed position, and so as to rotate about an axis C perpendicular to plane P.
  • spindle 6 is located at the converging end of axes B, and internal-grinding tool 7 is fitted to and projects from one end of spindle 6.
  • base 10 comprises a first annular plate 15 fitted releasably to a supporting structure of the grinding machine and for axially supporting supporting member 2, and a second annular plate 16 for axially securing supporting member 2, as described in detail below, and connected elastically to plate 15.
  • plate 15 has a first and a second axial end 20, 21 opposite each other, and which respectively secure assembly 1 to the supporting structure, and support supporting member 2 in a direction parallel to axis A.
  • axial end 21 comprises a radial first surface 22 facing plate 16; a second surface 23 radially outwards with respect to surface 22 and for statically supporting supporting member 2; and an axial portion 17 connecting surfaces 22 and 23.
  • surface 23 advantageously has a layer 35 of plastic antifriction surfacing material, which also acts as a damper between the two parts.
  • Plate 16 comprises an axial end 24 loosely facing surface 22 of plate 15; and a radial end 25 opposite axis A and defining a shoulder 26 cooperating with supporting member 2.
  • Shoulder 26 is defined by a radial first portion 27, and by an axial second portion 28 radially inwards with respect to radial portion 27, and which joins radial portion 27 to end 24.
  • Supporting member 2 rotates spindles 4, 6 (in known manner not shown) by means of motor 3 and transmission 12, is supported axially with respect to axis A on surface 23 of plate 15, and is secured axially with respect to axis A inside recess 14 defined by plates 15 and 16.
  • supporting member 2 is bounded, at one annular axial end 34, by a surface 52 extending radially with respect to axis A, resting on surface 23 of plate 15, and cooperating in sliding manner with surface 23 as supporting member 2 moves between the various angular work positions.
  • supporting member 2 At axial end 34, supporting member 2 comprises an annular, radially inner projection 33, which engages recess 14 of plate 16 to lock supporting member 2 axially with respect to base 10.
  • projection 33 is bounded axially at opposite ends by a radial surface 36 and by surface 52, and is bounded radially by an axial surface 38 connecting surfaces 36 and 52.
  • Projection 33 engages recess 14 by radial portion 27 of shoulder 26 pressing on radial surface 36, so that surface 23 of plate 15 contacts surface 52 of supporting member 2, leaving a radial clearance between axial surface 38 and axial portion 28 of shoulder 26.
  • Supporting member 2 comprises a through first annular cavity 30, of axis A, and a second annular cavity 31, parallel to cavity 30, which house transmission 12 and permit interaction between transmission 12 and supporting member 2 and motor 3 respectively.
  • motor 3 is fixed to and projects vertically from an axial end of supporting member 2 opposite base 10, and comprises an output shaft 32 engaging cavity 31 of supporting member 2, rotating about an axis parallel to axis A, and connected angularly to supporting member 2 by transmission 12, as explained in detail below.
  • shaft 32 rotates about axis A a sleeve 41 housed inside cavity 31 of supporting member 2, and both are fitted on their axial ends with a gear 54, which meshes with a tubular body 39 housed in a fixed position with respect to axis A inside cavity 30 of supporting member 2.
  • sleeve 41 is supported inside supporting member 2 on a number of bearings 42 enabling sleeve 41 to rotate with respect to supporting member 2 at a different angular speed from that of supporting member 2.
  • Tubular body 39 receives a torque, having a component along axis A, from shaft 32 via gear 54, is fixed by screws to plate 15 of base 10, and supports supporting member 2 in rotary manner with respect to axis A.
  • tubular body 39 has teeth 40, which mesh with gear 54 on shaft 32.
  • Tubular body 39 supports supporting member 2, in rotary manner about axis A, by means of two bearings 43 interposed between supporting member 2 and tubular body 39.
  • tubular body 39 is subject to torsional stress, which is transmitted by bearings 43 from tubular body 39 to supporting member 2, which, being movable angularly with respect to axis A, is rotated about axis A.
  • Base 10 advantageously comprises a fluidic assembly 19 to reduce the contact pressure between radial portion 27 of shoulder 26 and radial surface 36 of projection 33 as supporting member 2 moves from one work position to another, and to facilitate rotation of supporting member 2 with respect to axis A.
  • fluidic assembly 19 comprises an annular cavity 18 formed in fluidtight manner between plates 15 and 16; and a feed conduit 37 for feeding fluid into cavity 18.
  • Cavity 18 is defined by the axial clearance between surface 22 of plate 15 and end 24 of plate 16, and is bounded radially by axial portion 17 connecting surfaces 22 and 23.
  • Feed conduit 37 extends axially inside plate 15, and provides, with a given timing, for feeding external fluid into cavity 18 to produce axial thrust on plate 16 in the detachment direction of plate 16 from projection 33 of supporting member 2, and so reduce the contact pressure between radial portion 27 of shoulder 26 and radial surface 36 of projection 33.
  • Plates 15 and 16 are advantageously preloaded elastically to each other, so as to rapidly grip projection 33 of supporting member 2 between plates 15 and 16 when cavity 18 is emptied of fluid, and so immediately lock supporting member 2 in the desired angular work position, when the fluid pressure in cavity 18 is released.
  • plates 15 and 16 are connected by a number of bolts 29 having axes parallel to axis A, and by respective numbers of Belleville washers 13; and each number of Belleville washers 13 surrounds a relative bolt 29, and is housed inside a relative cavity in plate 16, between a bottom surface of plate 16 and the end of respective bolt 29.
  • Assembly 1 advantageously also comprises a balancing device 46 housed inside plate 15.
  • balancing device 46 comprises a number of axial conduits 47 for feeding fluid, e.g. air, to device 46; a circumferential groove 48 formed in the radially innermost edge of surface 23, and a number of fluid chambers 49 spaced angularly and preferably equally spaced about axis A along surface 23.
  • fluid e.g. air
  • Balancing device 46 also comprises a number of shutters 50 activatable selectively from outside, and each interposed between a respective chamber 49 and circumferential groove 48 to enable/disable fluid supply to respective chamber 49, and so adjust the centre of gravity, and achieve balanced dynamic performance, of assembly 1.
  • Assembly 1 advantageously also comprises a known encoder 44 for measuring angular displacement of supporting member 2 with respect to a fixed direction.
  • Encoder 44 comprises a fixed shaft 45, of axis A, fitted to the supporting structure of the grinding machine and housed radially loosely, and therefore subjected to no torsional stress, inside tubular body 39; and a movable member 53 fitted to the axial end of supporting member 2 opposite base 10, and projecting from supporting member 2 for easy access from the outside.
  • assembly 1 is immersed completely in an oil bath to lubricate supporting member 2 as it rotates about axis A with respect to base 10.
  • assembly 1 provides for performing a number of successive external and internal grinding operations.
  • assembly 1 can be set to three different angular work positions with respect to axis A: two for performing respective external grinding operations on a workpiece, and one for performing an internal grinding operation on the workpiece.
  • one of external-grinding tools 5 is positioned contacting the outer surface of the workpiece, and, in the internal-grinding angular work position of assembly 1, internal-grinding tool 7 is positioned contacting the inner surface of the workpiece.
  • the switch from one to another of the angular work positions is made by feeding fluid along feed conduit 37 into cavity 18.
  • the pressure exerted by the fluid on end 24 of plate 16 subjects plate 16 to thrust parallel to axis A and in the detachment direction of plate 16 from plate 15 and projection 33 of supporting member 2.
  • Said thrust reduces the contact pressure between radial portion 27 of shoulder 26 of plate 16 and radial surface 36 of projection 33 of supporting member 2, thus facilitating rotation of supporting member 2 with respect to axis A, and compressing washers 13.
  • motor 3 rotates shaft 32, which, by virtue of gear 54 meshing with teeth 40 on tubular body 39, subjects tubular body 39 to a torque having a nonzero component along axis A.
  • tubular body 39 Being fitted to angularly-fixed base 10, tubular body 39 cannot be rotated by said torque, and therefore is subjected to torsional stress, which is transmitted by bearings 43 from tubular body 39 to supporting member 2, which, being angularly movable about axis A, is rotated to move spindles 4, 6 into the desired angular position.
  • supporting member 2 As it rotates about axis A, supporting member 2 also rotates on sleeve 41 by means of bearings 42.
  • the vibration produced by rotation of the grinding tools is damped by layer 35 of antifriction and damping surfacing material.
  • Encoder 44 measures the angular displacement of supporting member 2 with respect to the supporting structure of the grinding machine, and, in known manner not shown, cuts off power to motor 3 when the desired angular work position is reached.
  • the equilibrium of assembly 1 may be optimized easily, in various operating configuration, by means of device 46.
  • circumferential groove 48 is fed with fluid along conduits 47. And, by acting externally on shutters 50, fluid supply from circumferential groove 48 to each chamber 49 can be enabled or disabled to selectively adjust the centre of gravity of assembly 1 with respect to the angular work position of supporting member 2 about axis A.
  • number 1' indicates as a whole a tool-holder assembly in accordance with a further embodiment of the present invention.
  • Tool-holder assembly 1' is similar to tool-holder assembly 1, and is described below only as regards the differences between the two; and any corresponding or equivalent component parts of tool-holder assemblies 1 and 1' are indicated, where possible, using the same reference numbers.
  • tool-holder assembly 1' comprises two external-grinding tools 5a' fitted to a spindle 4a' of axis C' parallel to plane P; a third external-grinding tool 5b' fitted to a spindle 4b' of axis D'; and a fourth external-grinding tool 5c' fitted to a spindle 4c' of axis F'.
  • axes D' and F' diverge and are located on the opposite side of plane P to axis C'.
  • external-grinding tools 5a' are fitted to and project from opposite axial ends of spindle 4a', coaxially with axis C'.
  • External-grinding tools 5b' and 5c' are fitted to and project from corresponding ends of respective spindles 4b' and 4c', coaxially with respective axes D' and F'. More specifically, axes D' and F' of spindles 4b' and 4c' converge towards the portions of spindles 4b', 4c' fitted with external-grinding tools 5b', 5c', so as to reduce the total inertia of assembly 1' with respect to axis A.
  • tool-holder assemblies 1, 1' provide for achieving short production lines and, at the same time, compact grinding machines capable of performing highly repeatable, precise movements with respect to the workpiece.
  • tool-holder assemblies 1, 1' enable a number of internal and external grinding operations to be performed on the same grinding machine, thus enabling a reduction in production line length by not having to feed the workpiece through a succession of different grinding machines, each for performing internal or external grinding operations.
  • each tool-holder assembly (1; 1') By featuring respective pairs of spindles (4; 4b', 4c') rotating about respective diverging axes (B; D', F'), each tool-holder assembly (1; 1') reduces the angular displacement and, therefore, the time taken to move from one angular work position to another.
  • Tool-holder assemblies 1, 1' also have a high degree of positioning precision and repeatability, by encoder 44 measuring angular displacement between the supporting structure of the grinding machine and supporting member 2, so that deformation of tubular body 39 of transmission 12, caused by torsional stress when starting motor 3, has no effect on operation of encoder 44.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
EP05425152A 2005-03-14 2005-03-14 Machine à meuler Withdrawn EP1702716A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05425152A EP1702716A1 (fr) 2005-03-14 2005-03-14 Machine à meuler

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05425152A EP1702716A1 (fr) 2005-03-14 2005-03-14 Machine à meuler

Publications (1)

Publication Number Publication Date
EP1702716A1 true EP1702716A1 (fr) 2006-09-20

Family

ID=34943100

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05425152A Withdrawn EP1702716A1 (fr) 2005-03-14 2005-03-14 Machine à meuler

Country Status (1)

Country Link
EP (1) EP1702716A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2425928A1 (fr) * 2010-09-06 2012-03-07 WENDT GmbH Bride destinée au montage d'un outil sur une broche
GB2542256A (en) * 2015-07-27 2017-03-15 Fives Landis Ltd Tool swivel assembly
CN112355798A (zh) * 2020-11-07 2021-02-12 浙江东盛精密机械有限公司 一种磨床
CN114274028A (zh) * 2021-12-31 2022-04-05 厦门创云精智机械设备股份有限公司 一种磨床工作台
CN117124238A (zh) * 2023-10-20 2023-11-28 歌玛磨具南通有限公司 一种磨床自适应砂轮装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB803143A (en) * 1955-12-28 1958-10-22 Sielemann Hans Grinding machine
US3427750A (en) * 1964-04-06 1969-02-18 Ulvsunda Verkstaeder Ab Wheel mount for internal grinding machines
EP0976498A2 (fr) * 1998-07-28 2000-02-02 TACCHELLA MACCHINE S.p.A. Ensemble d'usinage pour rectifieuse

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB803143A (en) * 1955-12-28 1958-10-22 Sielemann Hans Grinding machine
US3427750A (en) * 1964-04-06 1969-02-18 Ulvsunda Verkstaeder Ab Wheel mount for internal grinding machines
EP0976498A2 (fr) * 1998-07-28 2000-02-02 TACCHELLA MACCHINE S.p.A. Ensemble d'usinage pour rectifieuse

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2425928A1 (fr) * 2010-09-06 2012-03-07 WENDT GmbH Bride destinée au montage d'un outil sur une broche
JP2012056078A (ja) * 2010-09-06 2012-03-22 Wendt Gmbh 工具を主軸に組み付けるためのフランジ
GB2542256A (en) * 2015-07-27 2017-03-15 Fives Landis Ltd Tool swivel assembly
CN112355798A (zh) * 2020-11-07 2021-02-12 浙江东盛精密机械有限公司 一种磨床
CN114274028A (zh) * 2021-12-31 2022-04-05 厦门创云精智机械设备股份有限公司 一种磨床工作台
CN114274028B (zh) * 2021-12-31 2023-12-26 厦门创云精智机械设备股份有限公司 一种磨床工作台
CN117124238A (zh) * 2023-10-20 2023-11-28 歌玛磨具南通有限公司 一种磨床自适应砂轮装置
CN117124238B (zh) * 2023-10-20 2024-05-17 歌玛磨具南通有限公司 一种磨床自适应砂轮装置

Similar Documents

Publication Publication Date Title
US8721232B2 (en) Ring-rolling bearing with axial displacement and shaping tooling equipped with such a bearing
CA2623857C (fr) Plateau tournant
EP1702716A1 (fr) Machine à meuler
CN107649890B (zh) 一种基于高精度螺旋标准齿轮和蜗杆传动的精密分度转台及装配方法
JP2007181914A (ja) 工具の座および駆動のための工具ヘッド並びに該工具ヘッドで使用する工具
CN211639340U (zh) 一种基于万向工具系统的四反镜抛光测量装置
CN202356980U (zh) 双摆轴任意分度万能铣头
JP2009095954A (ja) インデックステーブル
CN110842693A (zh) 一种基于万向工具系统的四反镜抛光测量装备及加工控制方法
KR20160096105A (ko) 중앙 및/또는 편심 워크피스 영역, 특히 크랭크샤프트의 베어링 포인트의 가공 동안 중앙 워크피스 영역을 지지하는 방진구, 및 이러한 방진구를 갖는 연삭기
US6026549A (en) Crankpin phase indexing method and apparatus
JP2019520223A (ja) ワーク加工用回転テーブル
US2924491A (en) Machines comprising two elements displaceable relative to one another
CN102256742B (zh) 用于设定部件的轴向位置的方法、调整装置、调整系统和刀具夹持系统
KR101660956B1 (ko) 공작물 가공용 회전 테이블
US2808741A (en) Rotary table, particularly for machine tools
CN212635048U (zh) 一种电气机械设备加工用夹紧装置
JP6472697B2 (ja) 減速比を切り替え可能な回転テーブル
RU2353502C2 (ru) Устройство для механической обработки изделий сложной пространственной формы
JP2024501805A (ja) 工具ヘッド、工具ヘッドの動作方法及びそのような工具ヘッドを有する工作機械
TWI645931B (zh) 車銑頭的液壓制動裝置
RU2003127894A (ru) Универсальный настольный станок
JP4585096B2 (ja) 工作機械の旋回割出し装置
KR102480223B1 (ko) 머시닝 센터의 어태치먼트 회전 제어 장치
JP4358560B2 (ja) 刃物台の工具旋回装置

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA HR LV MK YU

17P Request for examination filed

Effective date: 20070319

AKX Designation fees paid

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR

17Q First examination report despatched

Effective date: 20121030

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20130509