EP0575296B1 - Grinding machine with grinding wheels at variable distance - Google Patents

Grinding machine with grinding wheels at variable distance Download PDF

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Publication number
EP0575296B1
EP0575296B1 EP93830171A EP93830171A EP0575296B1 EP 0575296 B1 EP0575296 B1 EP 0575296B1 EP 93830171 A EP93830171 A EP 93830171A EP 93830171 A EP93830171 A EP 93830171A EP 0575296 B1 EP0575296 B1 EP 0575296B1
Authority
EP
European Patent Office
Prior art keywords
grinding
axis
wheels
feed
workpieces
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
EP93830171A
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German (de)
English (en)
French (fr)
Other versions
EP0575296A1 (en
Inventor
Otto Visconti
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.)
OFFICINE MECCANICHE VIOTTO Srl
Original Assignee
OFFICINE MECCANICHE VIOTTO Srl
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Publication of EP0575296A1 publication Critical patent/EP0575296A1/en
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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
    • B24B7/04—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor involving a rotary work-table
    • 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

Definitions

  • the present invention is concerning the machines for grinding mechanical workpieces and specifically a grinding machine with the grinding wheels at a distance which is variable according to the position of the workpieces.
  • grinding machines there are several types of grinding machines, among which there are the well known “double head” or “duplex” grinders, fitted with two cup wheels of proper diameter and width, placed one against the other and carried by proper wheel spindles. In these machines the wheels are opposite but not necessarily coaxial, so that - in some cases - the active surfaces of the wheels are not parallel, rather usually converge in the direction the workpieces are fed through them during the grinding operation. These grinding machines are also fitted with mechanisms to hold the workpieces in proper seats and guide them in the path between the wheels, such a path and the displacement of the wheels being properly controlled.
  • grinding machines are basically of two types and operate according to two principles known as “Diskus” and "Wendt”.
  • the machines which operate according to the "Diskus” principle have the wheels in fixed position, with the active surfaces converging in the feed direction of the workpieces.
  • the distance between the wheels can be set according to the thickness of the workpieces, which are usualy carried through the wheels by a rotary feed disc with proper seats.
  • the workpieces are guided along a fix path, which is an arc of a circle, from the point of entrance into the grinding wheels, usually wider, to a point of exit from the grinding wheels, usually narrower, the difference between the said two points usually being equal to stock to be removed.
  • a fix path which is an arc of a circle
  • the machines which operate according to the "Wendt" principle on the opposite have parallel grinding wheels and the workpieces, placed on a holding-feed plate, are caused to oscillate with a radial displacement within or slightly outside the face of the grinding wheel whilst one or both wheels are fed and progressively grind the workpieces, basically at a constant feed rate, until the whole stock is removed.
  • the above mentioned two types of grinding machines may grind with good precision thanks to the way of handling the displacement of the grinding wheels and of the holding-feed mechanism of the workpieces.
  • a grinding machine is known to control the displacement of grinding wheels along a feed axis and of a work-holding turntable along a longitudinal direction perpendicular to the rotation axis of said wheels, the vertical position of which is manually adjustable, without providing any automatic relationship with the positions of the workpiece during its path over the grinding surface of the grinding wheel.
  • the present invention has the object of providing a grinding machine capable of handling high precision workpieces of any size, with short working cycles and mainly with minimum deformation of the geometrical characteristics of the wheels, which may be dressed at significantly long intervals.
  • a grinding machine comprising a control unit for controlling the displacement of one or more grinding wheels along a feed axis and of a mechanism for holding and feeding workpieces, said mechanism being movable in a plane perpendicular to the grinding wheel feed axis, wherein the grinding wheels are driven into rotation about the feed axis by respective motors, characterized in that at least one of the grinding wheels is adapted to be displaced along the feed axis to positions which are interpolated, according to a preset law, with the subsequent grinding positions of the workpiece held on said mechanism during its path over the grinding surface of the grinding wheel.
  • such a grinding machine fitted with variable-distance wheels, is of double head type and has the advantage of using parallel wheels to have a lower and more regular wear thereof.
  • the same machine offers the further advantage of being able to feed the workpieces according to a sosphisticated trajectory, as resulting from the interpolation of two linear motions or of a linear motion with a rotary motion, according to the way the hold-and-feed mechanism is activated.
  • This characteristic in conjunction with the variable feed of the grinding wheels, allows the machining by controlling the action at the same time over three axes.
  • Fig. 1 shows that the grinding machine according to the present invention substantially includes two cup wheels 1, 2 mounted on an axis A and driven by the respective motors M1 and M2 through a belt transmission. They can be reciprocally approached through known drives, preferably operated by an electronic unit (not shown) which accomplishes a numerical control.
  • the machine moreover includes a feed disc 3 parallel to and partly interposed between the grinding wheels 1 and 2, mounted on a slide 4.
  • the disc may rotate on an axis B, parallel to the axis A, whereas the slide may move along a third axis C, perpendicular to the said axes A, B.
  • the feed disc 3 is the holding fixture for the workpieces which are set in proper seats (not shown), preferably at the periphery of the disc and are fed between the wheels 1, 2 over a path resulting from the composition of the rotary motion of the feed disc 3 with the displacement of the slide 4, as better explained later on.
  • Fig. 2 is a top view of the same grinding machine which is showing the rim i.e. the active surface of the cup wheel 2, overlapping the periphery of feed disc 3. It is clear that the displacement along axis C of the disc-slide assembly modifies the overlapping of the active edge of the wheels in respect of the periphery of the feed disc where the seats for the workpieces are located.
  • Fig. 3 is a top view of a different accomplishment of a machine according to the present invention.
  • the feed part is a plate 5 which is mounted on a slide 4', shown by dotted lines, similar to the one described in the previous case.
  • Such a slide may translate, driven by known systems, along two orthogonal axes D and E on a plane which is parallel to and intermediate between the wheels of the machine or, preferably, it may translate along axis D only which corresponds to axis C of the former case.
  • the workpieces are -set in proper seats (not shown) of plate 5 in the overlapping area, feed being effected along a path resulting from the combination of two linear motions or along just one axis, as better explained later on.
  • the displacement over one or two axes of slide 4' is effected with known drivers (not shown) by the said numerical control unit in which, also in the case, a well determined law is entered to effect the interpolation of the motions of two or three involved axes.
  • a workpiece P laying into a seat over the periphery of the feed disc 3 according to Fig. 1, moves along a path which was pre-set through the combined movements of the feed disc and is guided through the wheels to be finally touched by them.
  • the said combined movements of the feed disc originate from the interpolation of its rotary motion with the linear motion of its center over axis C.
  • the workpiece P follows the path which is schematized by twelve subsequent positions corresponding to a full swing of the rotation center of the feed disc between the given extreme positions CR1, CR2. Obviously such a displacement is guided by the numerical control unit and its amplitude depends upon the kind of grinding desired for workpiece P, upon its size and the width of the active face of wheels 1, 2.
  • Fig. 4 also shows on top a diagram D1 which is schematizing (with three characteristics lines CC1, CC2 and CC3) three possible ways of feeding the cup wheels 1, 2 with the numerical control unit of the machine.
  • the grinding action of wheels 1, 2 takes place between a position X, where the contact between each wheel and the corresponding side of the workpiece P starts, and an end position Y, where the stock removal is completed. It is consequently possible to obtain a constant action of the wheels (characteristic line CC2) whereby to constant displacements of the workpiece correspond equal feeds of the grinding wheels 1, 2 and consequently constant stock removals.
  • a workpiece P is schematically shown as being in a proper seat of plate 5, which is mounted on the slide previously described and is moving along axis C of the machine from a position ES1 to an extreme position ES2 and back to ES1.
  • This kind of displacement is shown by seven successives positions of the workpiece which, between the second and the sixth position, travels between the grinding wheels 1, 2.
  • Fig. 5 is also showing diagram D2 which schematically makes clear again the main feature of the grinding machine according to the present invention.
  • the feed of the wheels 1, 2 may be programmed according to the characteristic line shown in the diagram to obtain that more than 3/4 of the stock be removed between the second and the third positions shown. Thus most of the necessary effort is observed by the outer rim of each wheel.
  • variable wheel feed connected with the position of the workpieces, no matter how they are fed, can be employed in any grinding machine with one or more grinding wheels, particularly in the "double head disc grinders" in which one wheel may displace on its axis and the other one may be in fix position.
  • All mechanical parts of the grinding machine according to the present invention may be of any known type, provided they are suitable, whereas the numerical control may be performed, for example, by a microprocessor which might handle at the same time the combined displacements along three axes. It is theoretically possible to assume that the displacements along three axes be, wholly or partially, even mechanically performed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
EP93830171A 1992-04-21 1993-04-21 Grinding machine with grinding wheels at variable distance Expired - Lifetime EP0575296B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI920953A IT1254896B (it) 1992-04-21 1992-04-21 Macchina rettificatrice con mole a distanza variabile
ITMI920953 1992-04-21

Publications (2)

Publication Number Publication Date
EP0575296A1 EP0575296A1 (en) 1993-12-22
EP0575296B1 true EP0575296B1 (en) 1999-09-29

Family

ID=11363006

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93830171A Expired - Lifetime EP0575296B1 (en) 1992-04-21 1993-04-21 Grinding machine with grinding wheels at variable distance

Country Status (4)

Country Link
EP (1) EP0575296B1 (it)
JP (1) JP2728841B2 (it)
DE (1) DE69326578T2 (it)
IT (1) IT1254896B (it)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102756314A (zh) * 2012-07-19 2012-10-31 绍兴市家度弹簧机械有限公司 多功能立式双端面磨床

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6296553B1 (en) * 1997-04-02 2001-10-02 Nippei Toyama Corporation Grinding method, surface grinder, workpiece support, mechanism and work rest
CN101116948B (zh) * 2007-09-05 2011-04-20 王德康 用于盘类零件磨削的夹持驱动装置
WO2013102104A1 (en) * 2011-12-30 2013-07-04 Saint-Gobain Abrasives, Inc. Grinding ring with dual function grinding segments
CN114367895A (zh) * 2022-01-11 2022-04-19 蓝山泓源工艺品有限公司 一种雨伞加工用自动化打磨机
CN114918761B (zh) * 2022-07-05 2023-04-21 杭州宽泓机械有限公司 一种数控转盘式卧轴双端面磨床

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1752268A1 (de) * 1968-04-27 1971-05-13 Mengele & Soehne Masch Karl Rundtisch-Flachschleifmaschine
US3872626A (en) * 1973-05-02 1975-03-25 Cone Blanchard Machine Co Grinding machine with tilting table
JPH0518046Y2 (it) * 1986-02-06 1993-05-13
JP2745725B2 (ja) * 1989-10-04 1998-04-28 旭硝子株式会社 電解研摩・研削方法及びその装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102756314A (zh) * 2012-07-19 2012-10-31 绍兴市家度弹簧机械有限公司 多功能立式双端面磨床

Also Published As

Publication number Publication date
DE69326578T2 (de) 2000-05-04
ITMI920953A1 (it) 1993-10-21
JP2728841B2 (ja) 1998-03-18
IT1254896B (it) 1995-10-11
ITMI920953A0 (it) 1992-04-21
EP0575296A1 (en) 1993-12-22
JPH068119A (ja) 1994-01-18
DE69326578D1 (de) 1999-11-04

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