EP0311896A2 - Lunette de support à poursuite radiale pour rectifieuses - Google Patents

Lunette de support à poursuite radiale pour rectifieuses Download PDF

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Publication number
EP0311896A2
EP0311896A2 EP88116531A EP88116531A EP0311896A2 EP 0311896 A2 EP0311896 A2 EP 0311896A2 EP 88116531 A EP88116531 A EP 88116531A EP 88116531 A EP88116531 A EP 88116531A EP 0311896 A2 EP0311896 A2 EP 0311896A2
Authority
EP
European Patent Office
Prior art keywords
workpiece
quill
jaws
jaw
caster according
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Withdrawn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
EP88116531A
Other languages
German (de)
English (en)
Other versions
EP0311896A3 (fr
Inventor
Josef Müller
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 EP0311896A2 publication Critical patent/EP0311896A2/fr
Publication of EP0311896A3 publication Critical patent/EP0311896A3/fr
Withdrawn legal-status Critical Current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
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/06—Work supports, e.g. adjustable steadies
    • B24B41/067—Work supports, e.g. adjustable steadies radially supporting workpieces

Definitions

  • the invention relates to a caster for grinding machines for cylindrical grinding of workpieces by means of a grinding wheel that can be adjusted radially to the workpiece axis, with at least two jaws, which can be placed at two points offset on the circumferential angle on a surface of the workpiece, and with drive means for delivering the jaws synchronously with that due to cylindrical grinding caused reduction in the workpiece diameter, whereby one of the jaws is fed in a linear movement.
  • Such setting sticks are used in particular to support slim, long workpieces during machining. Such workpieces tend, on the one hand, to sag due to gravity and, on the other hand, to evade the pressure exerted on the workpiece by the grinding tool by rearing up. This means, for example, that an exact round profile cannot be achieved during external cylindrical grinding.
  • the cylindrical grinding machine known from DE-AS 23 60 073 has a workpiece support device which is provided with two support jaws. One jaw lies on the respective underside of the workpiece, the other on the point of the workpiece opposite the point of application of the grinding wheel.
  • the jaws To ensure that the workpiece is supported during the entire machining process, i.e. with the outer diameter of the workpiece to be machined decreasing, the jaws must follow this decrease, this taking place synchronously with the infeed of the grinding wheel.
  • a riser or support device is referred to as a trailing riser.
  • the synchronous infeed takes place via a control mechanism.
  • the jaw that lies opposite the grinding tool on the workpiece is moved in a straight line, directed towards the center of the longitudinal axis of the workpiece.
  • the jaw resting on the underside of the workpiece has an angle lever, the outer end of which is articulated on a housing via a pin.
  • the other outer end of the angle lever lies on the underside of the workpiece.
  • the angle lever is articulated with a Push rod connected. A linear feed movement of this push rod is converted into a pivoting movement of the jaw resting on the underside, which is directed approximately towards the workpiece center axis.
  • Caster sets with angle lever infeed of a jaw can only be used in a certain infeed range, which is limited due to the geometry of the angle lever. So that the lower jaw always rests on the lowest circumferential point of the workpiece during the pivoting movement, a curved contour of the jaw surface is necessary, which must extend with increasing curvature as the pivoting angle increases. Jaws with a curved contact surface are difficult to manufacture and have a short service life, in particular due to uneven wear. For the flexible machining of workpieces with different diameter sizes, different caster sets may then have to be provided on the grinding machine.
  • the object of the present invention is to provide a caster of the type mentioned at the outset, which is structurally simple in construction and which provides long-term safe support in a large work area, i.e. enable the processing of workpieces of various sizes with high removal rates.
  • the object is achieved in that both jaws are linearly fed, the directions of the Infeeds are in opposite directions and are inclined to tangents that are located at the points on the surface. Due to the linear infeed movement, articulated lever-like components are no longer necessary, but the jaws can be designed as rigid, rod-shaped bodies which only have to be displaced linearly. Due to the inclination of the infeed directions to the tangents of the contact points on the workpiece surface, the jaws can be fed in opposite directions. Workpieces with different diameters and different removal rates can be flexibly machined with a certain specified stroke. The contact points of the workpiece also move linearly, so that straight contact edges of the jaws are possible. These are easy to manufacture and wear evenly, which makes long service life possible.
  • a structurally particularly simple and narrow trailing riser is created in that the feed directions are parallel.
  • a common drive is expediently provided for this purpose.
  • a structurally particularly simple trailing riser is created in that the jaws are designed in sections as quills.
  • a compact trailing riser is created in that the tangents to the contact points run at 90 ° to each other.
  • a particularly narrow, space-saving trailing riser is provided in that two quills arranged one above the other are provided, the jaw of the first lower quill resting on the respective underside of the workpiece and the jaw of the second upper quill resting on a side of the workpiece opposite the grinding tool.
  • a particularly safe support of the workpiece is achieved in that a third, uppermost quill is provided, which is arranged above the second quill, and in that the jaw of the third quill lies on the respective upper side of the workpiece.
  • a structurally particularly simple trailing riser is provided in that the jaws are provided with axially aligned threaded bushes of opposite pitch, into which a shaft of a drive motor runs, which is provided with corresponding opposing threaded sections.
  • An easily adjustable caster is created in that each jaw is provided on the workpiece-side end area with a covering piece on which the workpiece to be machined is located, and that the covering piece is adjustable in the direction of advance in terms of dimension and / or angle.
  • the adjustability of the covering piece enables readjustment when the covering is worn.
  • a prestressing in the direction of the workpiece to be supported can be achieved by adjusting the angle of the covering piece, in particular that of the lower jaw.
  • a large pretension can be achieved with a large angle of attack for heavy workpieces with a large diameter.
  • This adjustment option is special advantageous for such designs in which the jaws are fed by a single drive, so that possible uneven wear can be compensated for by adjusting the jaw covering pieces without manipulation of the connection point between the drive and the jaw.
  • a particularly narrow trailing set with a large diameter adjustment range is created in that the first or second sleeve in the jaw area, seen in the longitudinal direction of the workpiece, are narrower, in such a way that the narrower jaw area of the jaw of the lower sleeve on the left and that Upper quill are arranged on the right side of the longitudinal central axis of the quill or vice versa, so that the jaws can be covered.
  • This arrangement enables the formation of relatively elongated cheek edges, which in turn has the consequence that very large workpiece reductions or a wide range of workpieces of different diameters can be processed with one and the same trailing set.
  • the contact points of a round workpiece with maximum initial machining diameter are at the lower end of the jaw edge of the upper jaw or on the left outer end of the jaw edge lower cheek.
  • the contact points on the jaw edge of the upper jaw relatively speaking, move upwards and on the jaw edge of the lower sleeve towards the grinding tool.
  • the absolute direction of movement of the jaw edge of the upper jaw is after directed below, whereas that of the lower jaw is directed away from the grinding tool.
  • the length of the jaw edges thus determines, among other things, the maximum or minimum tool diameter.
  • the sleeves in the jaw area Due to the narrow staggered design of the sleeves in the jaw area, they can overlap when viewed in the direction of the workpiece and, in extreme cases, can be designed so that they meet at their outermost rolling points in the tool longitudinal center axis at maximum infeed, i.e. theoretically there is material removal down to zero -Diameter possible.
  • the 1 to 3 has a housing 11, the underside of which is provided with a base 12 which is placed on a slide 13 of an external cylindrical grinding machine 5.
  • the carriage 13 is movable along a workpiece carriage axis 14, which is commonly referred to as the Z axis.
  • a solid setting block 15 is accommodated in the housing 11, in which a roughly U-shaped recess 16 is recessed, in which a first lower quill 17 and a second upper quill 18 are received. Both quills 17, 18 have an approximately square cross section (see FIG. 2) and are made of steel.
  • the first lower sleeve 17 has a rigid, elongated rod-shaped body 19 which is slidably mounted in a lower region of the recess 16 of the setting block 15.
  • the body 19 of the sleeve 17 protrudes from the setting block 15 or the housing 11 and merges into a jaw 21 at a front end region 20.
  • the roughly rectangular jaw 21 has on its upper side 22 a jaw covering piece 23, the upper edge 24 of which represents the jaw edge of the jaw 21.
  • the longitudinal axis of the first lower quill 17 or of the elongated body 19 extends at an angle ⁇ inclined to the horizontal plane of the slide bed.
  • the first lower sleeve 17 is provided on its end region facing away from the cheek 21 and located in the housing 11 with a bushing 25 which, viewed in cross section, has an approximately square profile (see FIG. 2) and is provided with a threaded bore 26, whose longitudinal axis runs parallel to the quill 17.
  • the bush 25 is firmly connected to the sleeve body 19.
  • a threaded spindle 27 provided with a corresponding external thread is received in the threaded bore 26 of the bushing 25.
  • the threaded spindle 27 is provided only in a lower area with the external thread corresponding to the threaded bore 26, this area corresponding to a displacement distance y of the lower sleeve 17.
  • the threaded spindle 27 projects beyond the housing 11 and is connected to a stepping motor or servo motor 29 via a reduction gear 28.
  • the axis of the threaded spindle 27 runs in the axis of the armature shaft of the motor 29.
  • the second upper quill 18 has a body 30, which likewise runs in the housing 11 or the setting block 15 and is slidably mounted in the upper area of the recess 16 in the setting block 15.
  • the body 30 of the upper second quill 18 protrudes from the housing 11 on the same side as the first lower quill 17 and merges into a narrower cheek region 31, seen in plan view (see FIG. 3), the front, vertically running end edge of which a covering piece 32 is provided.
  • the body 30 of the upper sleeve 18 is provided in the housing-internal end area on the underside thereof with a bush 33 which is provided with a threaded bore, and in which the threaded spindle 27 is also in the adjustment area x of the upper second sleeve 18 with a thread of the bush 33 appropriate external thread.
  • the sleeve 25 of the lower sleeve 17 and the sleeve 33 of the upper sleeve 18 are arranged so that the sleeves 17, 18 can be adjusted along their maximum path by turning the threaded spindle 27 without the sleeves 25, 33 meeting or block the movement of the quills.
  • the external threads on the threaded spindle 27 in the area of the bushes 25 and 33 are in opposite directions, so that a rotation of the threaded spindle 27 by the stepper motor 29 results in a linear opposite movement of the first or second sleeve.
  • the upper edge 24 of the lining piece 23 of the first lower sleeve 27 lies against the lowest point 6 of a workpiece 34 which is circular in cross section and supports it against sagging due to gravity.
  • the upper edge 24 runs in the tangent 42 at point 6.
  • the front edge 43 of the vertically extending covering piece 32 of the second upper sleeve 18 lies against an outer circumferential point 7 of the workpiece 34, as seen in the viewing direction of FIG. 1, which is opposite to a point of application of a grinding wheel 35 of a grinding tool.
  • the front edge 43 runs in the tangent 44 at point 7.
  • the upper second quill 18 supports the workpiece 34 against building up, caused by the pressure exerted by the grinding wheel 35 on the workpiece 34 in the direction of the axis 14.
  • the thread pitches of the threads of the threaded spindle 27 or the internal threads of the bushes 25 and 33 are also subject to the geometric dependency mentioned above.
  • the grinding wheel 35 is fed or the sleeves 17, 18 are fed by the stepping motor 29 via a mechanism (not shown here) which ensures the synchronous control.
  • FIG. 3 shows a so-called delayed retraction of the caster.
  • the workpiece is in the so-called free workpiece slope.
  • the trailing set is placed on the pre-ground workpiece seat opposite the grinding wheel 35.
  • the caster is then either moved from the side of the workpiece headstock or its tip 37 along the tool slide axis 14 (direction arrow 38) until it has reached its starting position.
  • the caster can also be moved from the tailstock or its tip 39, so that in the event of manipulations, for example repairs or clamping and unclamping of the workpiece 34 between the headstocks, unimpeded access by the caster is possible.
  • the trailing set is also carried so that it comes to rest opposite the grinding wheel 35 and in each processing phase the workpiece 34 is protected against sagging or Raising supports.
  • the quills do not run parallel but have different angles of inclination with respect to the horizontal.
  • the lower quill is designed in the same way as the quill 17 shown in FIG. 1.
  • the angle of inclination of the second upper quill is smaller, i.e. the contact point of the corresponding jaw edge of the workpiece surface is shifted in the direction of the tool vertex compared to that shown in FIG. 1.
  • the point of application of the grinding wheel 35 which is opposite the contact point of the upper sleeve, is then shifted towards the contact point 6 in FIG. 1.
  • the grinding wheel is not moved in a horizontal movement, as shown in FIG. 1, but is fed in obliquely from below.
  • each quill is provided with its own drive.
  • FIG. 4 In a further exemplary embodiment of a caster set 50 shown in FIG. 4, this is identical to that in FIG. 11 with respect to the housing 11, slide 12 or slide bed 13 and first lower sleeve 17 or second upper sleeve 18 Constructed in connection with Fig. 1 embodiment described, so that the same reference numerals are used in this respect.
  • the third uppermost sleeve 51 is also received in a sliding guide of the set block 15. Like the quills 17, 18, it has an approximately square cross section when viewed in the longitudinal direction.
  • the third sleeve 51 merges into a jaw 52 which is provided with a coating, the lower edge 53 of which runs parallel to the horizontal and thus parallel to the lining piece 34 of the first lower sleeve 17.
  • the third uppermost quill 51 lies against an uppermost circumferential point 59 of the round workpiece 34, thus supporting it on the upper side.
  • the lower edge 53 runs in the tangent 49 at point 59.
  • Additional support of the workpiece 34 by a third jaw on the top is necessary if, for example, very long thin workpieces 34 are to be ground, which, viewed over their length, have an uneven mass distribution.
  • the third uppermost quill 51 is provided with its own drive motor 54, which feeds the third quill 51 linearly and in the same direction as the second upper quill 18, but in the opposite direction to the first lower quill.
  • the third sleeve 51 is in turn connected to a threaded spindle 55 of the stepping motor 54 via a bushing, which is arranged behind the third sleeve 51, as seen in the plan view of FIG. 4.
  • the trailing riser 50 is designed so that, if necessary, the third, top quill 51 including its drive, i. Threaded spindle 55 and motor 54, can be removed. Depending on the need or depending on the design of the workpiece 34, the trailing riser can be retrofitted with a third quill 51. This enables an extremely flexible use of the caster.
  • FIG. 5 schematically shows a processing sequence of a slim, long workpiece 56 clamped between two tips 37, 39 and provided with a cam 57.
  • This shows the flexible area of use and work of a trailing ram 50 according to the invention.
  • a method section A an annular area 56a of the workpiece 56 is first ground to a round shape and supported by the three quills 17, 18, 51.
  • FIG. 5 only the second upper sleeve 18 is indicated for this method section A, which lies opposite the grinding tool or grinding wheel (not shown here) and supports the workpiece against building up.
  • a further annular section 56b of the workpiece 56 is processed. Both the grinding tool and the trailing riser are moved from the area 56a to the area 56b, the grinding wheel and the trailing riser jaws or their covering pieces on the Tool section 56b started and this section machined.
  • step B only the jaw of the first lower sleeve 17 is shown in FIG. 5, which supports the workpiece 56 in section 56b against sagging.
  • a section 56c of the workpiece 56 is machined, for which purpose the grinding tool and trailing setter are moved and placed on the workpiece surface.
  • step C only the third uppermost sleeve 51 is shown in FIG. 5, which supports the workpiece 56 before lifting (due to the imbalance and the direction of the grinding force by the cam 57).
  • the respective quills are guided in individual block blocks which can be moved independently of one another, so that they can not only be delivered independently of one another, for example via motors 29 or 58, to workpiece 34, but also in vertical direction or along the workpiece axis are independently displaceable.
  • the covering piece 63 of the jaw 21 of the lower first quill 17 is arranged inclined at an angle ⁇ from the horizontal plane.
  • the angle of inclination ⁇ is to be taken into account when determining the thread pitch of the threaded spindle 62, that is to say when determining the adjustment path y.
  • the adjustment of the lining piece 63 of the first lower sleeve 17 can be carried out in order to pretension the jaw 21 in the direction of the workpiece 34. It is desirable to drive with large preload for large workpiece diameters or with small preload for small workpiece diameters. This preload can be selected by changing the angle.
  • the edge of the covering piece 63 runs in the tangent 65 of the contact point 66 on the workpiece surface 41.
  • the infeed direction of the lower sleeve 17 runs inclined to the tangent 65.
  • the drive spindles were each designed as threaded spindles. In further exemplary embodiments, not shown here, it is designed as a sliding or rolling spindle.
  • the quills are round or polygonal and provided with a roller guide.
  • the drive can also be carried out via servomotors, with position detection via ROD, glass scale or the like.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
EP88116531A 1987-10-14 1988-10-06 Lunette de support à poursuite radiale pour rectifieuses Withdrawn EP0311896A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873734734 DE3734734A1 (de) 1987-10-14 1987-10-14 Nachlaufsetzstock fuer schleifmaschinen
DE3734734 1987-10-14

Publications (2)

Publication Number Publication Date
EP0311896A2 true EP0311896A2 (fr) 1989-04-19
EP0311896A3 EP0311896A3 (fr) 1990-03-14

Family

ID=6338286

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88116531A Withdrawn EP0311896A3 (fr) 1987-10-14 1988-10-06 Lunette de support à poursuite radiale pour rectifieuses

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EP (1) EP0311896A3 (fr)
JP (1) JPH01135454A (fr)
DE (1) DE3734734A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103354773A (zh) * 2010-12-22 2013-10-16 特诺恩股份公司 改进型磨机和打磨方法

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202004021661U1 (de) 2004-10-27 2010-02-04 Emag Holding Gmbh Synchronschleifmaschine
DE102009059897B4 (de) * 2009-12-21 2013-11-14 Erwin Junker Maschinenfabrik Gmbh Verfahren zum Rundschleifen von langen, dünnen Rundstangen und Rundschleifmaschine zur Durchführung des Verfahrens
CN103084976B (zh) * 2013-01-25 2015-10-21 江苏瑞普机床有限公司 “v”形支撑工装夹具
DE102013225292B4 (de) * 2013-12-09 2018-11-15 Erwin Junker Maschinenfabrik Gmbh Schleifmaschine zum schleifen von zentrischen und/oder exzentrischen lagerstellen an wellenteilen mit einer lünette zum abstützen der lagerstellen
CN104108064A (zh) * 2014-06-24 2014-10-22 常州德日机械有限公司 一种内燃机喷嘴座锥面加工用夹具
DE102015206565B4 (de) * 2015-04-13 2024-02-08 Erwin Junker Grinding Technology A.S. VERFAHREN UND SYSTEM ZUM AUßENSCHLEIFEN VON WELLENTEILEN ZWISCHEN SPITZEN
CN112045566B (zh) * 2020-09-14 2022-05-13 中国航发贵州黎阳航空动力有限公司 一种加工大半径非整圆弧面及非整圆锥面夹具及使用方法

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Publication number Priority date Publication date Assignee Title
US2141596A (en) * 1936-11-19 1938-12-27 Norton Co Automatic steady rest for grinding machines
DE850861C (de) * 1943-03-13 1952-09-29 Fortuna Werke Spezialmaschinen Setzstock, insbesondere an Schleifmaschinen
DE1239170B (de) * 1952-10-06 1967-04-20 Waldrich Gmbh H A Werkstueckabstuetzung fuer Walzendrehbaenke
DE1048184B (de) * 1957-10-29 1958-12-31 Mso Maschinen U Schleifmittelw Setzstock fuer elektrohydraulisch gesteuerte bzw. zustellbare Bearbeitungs-, insbesondere Schleifmaschinen
GB1160276A (en) * 1965-12-28 1969-08-06 Hobson Ltd H M Improvements in or relating to Work Steadies
GB1142939A (en) * 1966-04-28 1969-02-12 Churchill Machine Tool Co Ltd Improvements in steadies for grinding machines
JPS5133317B2 (fr) * 1972-11-29 1976-09-18
JPS5577466A (en) * 1978-12-08 1980-06-11 Toyoda Mach Works Ltd Center rest device
JPS60114433A (ja) * 1983-11-28 1985-06-20 Okuma Mach Works Ltd ワ−クホルダ

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103354773A (zh) * 2010-12-22 2013-10-16 特诺恩股份公司 改进型磨机和打磨方法

Also Published As

Publication number Publication date
DE3734734A1 (de) 1989-04-27
DE3734734C2 (fr) 1991-09-12
EP0311896A3 (fr) 1990-03-14
JPH01135454A (ja) 1989-05-29

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