EP1526946B1 - Verfahren und system zum schleifen eines mit einer längsbohrung versehenen rotationssymmetrischen maschinenbauteils - Google Patents

Verfahren und system zum schleifen eines mit einer längsbohrung versehenen rotationssymmetrischen maschinenbauteils Download PDF

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Publication number
EP1526946B1
EP1526946B1 EP03784116A EP03784116A EP1526946B1 EP 1526946 B1 EP1526946 B1 EP 1526946B1 EP 03784116 A EP03784116 A EP 03784116A EP 03784116 A EP03784116 A EP 03784116A EP 1526946 B1 EP1526946 B1 EP 1526946B1
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EP
European Patent Office
Prior art keywords
grinding
machine component
spindle
longitudinal
grinding wheel
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 - Fee Related
Application number
EP03784116A
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German (de)
English (en)
French (fr)
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EP1526946A1 (de
Inventor
Erwin Junker
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Erwin Junker Maschinenfabrik GmbH
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Erwin Junker Maschinenfabrik GmbH
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Publication of EP1526946A1 publication Critical patent/EP1526946A1/de
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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
    • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
    • B24B5/02—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work
    • B24B5/12—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work for grinding cylindrical surfaces both externally and internally with several grinding wheels
    • 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
    • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
    • B24B5/02—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work
    • B24B5/14—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work for grinding conical surfaces, e.g. of centres

Definitions

  • the invention relates to a method for grinding a rotationally symmetrical machine component provided with a longitudinal bore, whose one end-side end surface is designed as an effective surface in the form of a particularly flat truncated cone shell with a contour which is rectilinear or curved in cross-section, according to the preamble of claim 1.
  • the machine components to be ground with this method are present, for example, in transmissions with continuously variable transmission, as required in motor vehicles.
  • two machine components face each other with facing active surfaces.
  • the active surfaces thus form an annular space with an approximately wedge-shaped cross section, in which a tension member such as a chain or a belt, depending on the distance of the active surfaces of each other back and forth between different radii. Since such a transmission must work very accurately and transmit large torques, high demands are placed on the dimensional accuracy and the surface quality of the machine components. This also applies to the associated grinding operations, especially when grinding the active surface.
  • the method mentioned in the introduction is carried out according to the state of the art known from operational practice in individual operations, that is to say in a plurality of fixtures.
  • the active surface is ground by means of corundum grinding wheels in Schräginstech Kunststoffe.
  • the machine component For internal cylindrical grinding of the longitudinal bore located on the machine component, the machine component must then be clamped in another machine, where the inner cylindrical grinding of the bore wall can take place with a correspondingly small grinding wheel.
  • the known method has various disadvantages.
  • the DD 143 700 deals with a device for grinding tungsten plates, which are used, inter alia, as rotating electrodes in x-ray tubes.
  • This Wolframteller has the graphic representation of the contour of a truncated cone, in which the inclination of the surface line relative to the base is about 30 °.
  • the Wolframteller is clamped in a workpiece holder, which is pivotable relative to the device frame about a vertical axis.
  • a longitudinal support Opposite the workpiece holder is a longitudinal support, which is displaceable in a horizontal plane.
  • On the longitudinal support a cross slide is arranged, which carries a grinding spindle for driving a small cylindrical grinding wheel, which serves for the internal grinding of a bore in the tungsten plate.
  • the longitudinal support also carries a rigid electric grinding spindle for driving a tapered grinding wheel.
  • a tapered grinding wheel With the tapered grinding wheel, a face and the cone-shaped area of the tungsten plate are to be ground. To do this, the tapered grinding wheel and the tungsten plate must be brought into the correct position by pivoting the workpiece holder and moving the longitudinal support and by manually operated feed controls. Something else than an oblique grinding in the area of the cone shroud is the DD 143 700 not to be taken. The partly manually operated known device is cumbersome and with manual skill to use.
  • a machine tool for grinding workpieces in which there are two cylindrical grinding wheels of different sizes on a revolver, which in turn is arranged on a sliding carriage. By pivoting the turret by 180 °, the two grinding wheels can be selectively brought to bear against different areas of a rotationally symmetrical workpiece.
  • the workpiece is arranged in a workpiece holder, which in turn is displaceable on a carriage in the longitudinal direction of the workpiece. For grinding, the workpiece is set in rotation.
  • the workpiece holder can be adjusted at an angle of +/- 30 ° obliquely to the direction of displacement of the workpiece holder.
  • JP 2000-271827 describes the grinding of machine components whose one end face is formed as an active surface 24 in the form of a flat truncated cone with a straight contour in cross section and clearly show how the skilled person has proceeded so far when grinding such workpieces.
  • the active surface of the machine component is ground by a grinding wheel with a conical contour is guided radially along the effective surface. The movement takes place in two mutually perpendicular components.
  • the grinding spindle 53, 54 is arranged on a cross slide.
  • the invention is based on the object to provide a method of the initially mentioned type, with which the processing time is shortened and yet a better grinding result is achieved.
  • the solution of this problem consists in accordance with the process steps listed in the characterizing part of claim 1 in that at the one hand held on its outer circumference machine component first the active surface is ground in the perpendicular grinding process by a first cylindrical grinding wheel delivered with its rotating peripheral surface perpendicular to the effective surface is moved by the machine component in the direction of its rotational and longitudinal axis relative to the first grinding wheel, wherein the axial extent of the first grinding wheel covers the radial oblique stretch of the active surface, and then in the same clamping the inner wall of the longitudinal bore is ground by a second grinding wheel of smaller diameter by pivoting a wheel spindle, which carries at least the first and the second grinding wheel, introduced into the longitudinal bore of the machine component and delivered radially against the inner wall becomes.
  • the machine component to be ground thus remains in a single set-up in which all grinding operations are carried out.
  • This is made possible by first placing a first cylindrical grinding wheel perpendicular to the active surface and then inserting a second cylindrical grinding wheel of smaller diameter into the longitudinal bore of the machine component and hitting it radially against the inner wall.
  • the possibilities of bringing two different grinding wheels on different working surfaces of one and the same workpiece into effect are generally known to the person skilled in the art.
  • a special feature of the inventive solution is that the first grinding wheel with its rotating peripheral surface is made perpendicular to the inclined running effective surface, the axial extent or the width of the first grinding wheel covers the radial oblique extension of the effective surface.
  • the active surface is ground with the cylindrical peripheral surface of the grinding wheel in a perpendicular grinding process, wherein the delivery is effected by a mutual relative displacement.
  • the advantage is a constant cutting speed over the entire width of the grinding wheel. This ensures an increased surface quality and surface structure.
  • optimized dressing parameters are obtained when dressing the grinding wheel, because during dressing the same parameters, namely an identical dressing speed as during grinding as well as the same speed ratios and feed values are achieved. Because the cutting speed of the grinding wheel remains the same over the effective area, the achievable surface roughness is constant. Due to the same cutting speed of the grinding wheel over the complete conical surface, optimum values for the machining volume per unit of time can be achieved.
  • the cutting speed at the outside diameter of the conical surface is then about 80% of the cutting speed of the grinding wheel at the small diameter of the conical surface. This is in contrast to the machining volume, since this is the largest at the large diameter on the conical surface.
  • the cutting speed ratio to the cutting volume, which must be removed via the conical surface is substantially improved by the grinding wheel set perpendicular to the conical surface.
  • the first grinding wheel in principle, it would indeed be possible for the first grinding wheel to be set in a strictly radial direction against the effective surface of the machine component to be ground by moving the first grinding spindle transversely to its longitudinal extent and in an oblique direction towards the machine component.
  • the machine component would have to be arranged in this case at a constant position of the associated machine bed.
  • the device required for carrying out the method becomes simpler if, according to the method according to the invention, the feed takes place by the machine component being displaced in the direction of its rotational and longitudinal axis relative to the first grinding wheel.
  • the subsequent internal grinding of the longitudinal bore can be made by longitudinal grinding.
  • the method of peel grinding in question in which immediately ground to the final diameter.
  • the inner wall of the longitudinal bore is ground by Einstechschleifen.
  • the last method is particularly in question if, according to a further advantageous variant of the method of the inner wall of the longitudinal bore individual axial sections are ground.
  • At least three grinding wheels are provided, which are brought into their operative position by pivoting of three grinding spindles carrying the grinding wheels.
  • the order is not mandatory, after which first the active surface of the machine component and then the inner walls of the longitudinal bore are ground.
  • the reverse order is also possible.
  • the grinding expert will determine the order of operations depending on the design of the machine component, because in this case the amount of heating during grinding and the type of clamping is important.
  • the grinding spindle slide is moved in the correct manner to the clamped machine component and the grinding headstock is rotated such that the first grinding spindle with the cylindrical peripheral surface of the first grinding wheel attached to it touches the working surface of the grinding wheel Machine component is employed.
  • the first grinding spindle must in this case occupy an angular position relative to the rotational and longitudinal axis of the machine component, which is less than 90 °. Then, the active surface can be ground by the first grinding wheel in the vertical grinding process, that is, with its known advantages.
  • the grinding spindle slide is moved transversely to the rotational and longitudinal axis of the machine component slightly outward and rotated on the grinding spindle slide grinding headstock about its pivot axis until the axis of rotation of the second grinding spindle with the associated second grinding wheel is approximately in the rotational and longitudinal axis of the machine component.
  • the second grinding wheel is then moved into the longitudinal bore of the machine component and delivered radially, so that the internal cylindrical grinding of the longitudinal bore is made. In this way, all necessary grinding operations on the machine component are done in a single setup.
  • a prerequisite, however, in any case, a first grinding wheel, the axial extent or width is greater than the oblique extension of the active surface, because only by the vertical grinding process of the active surface can be done with all its advantages.
  • a structurally advantageous development of the system according to the invention is that in the arrangement of two grinding spindles on the wheelhead whose axes are parallel to each other and the two grinding wheels on the same side of the grinding headstock are mounted. In this way, there is a change between the two machining operations with only small displacement and pivoting paths of the grinding headstock.
  • three grinding spindles are mounted on the grinding headstock at an angular distance of 120 °, each with one grinding wheel. In this case, one of the three grinding spindles is then optionally brought into the operative position.
  • the clamping device is a chuck with centrally adjustable clamping jaws, which is also driven for rotation.
  • Such chucks have proven to be reliable and are known.
  • the clamping device is located on a grinding table, which is movable relative to the grinding spindle slide in the rotational and longitudinal axis of the machine component.
  • the feed movement during grinding of the active surface is then carried out by the grinding table is moved with the machine component relative to the first grinding wheel in the longitudinal direction of the machine component.
  • FIG. 1 first explains schematically the system according to the invention, with which the inventive method can be performed.
  • a device for grinding the machine component in the view from above is shown.
  • a workpiece headstock 2 On a machine bed 1 is a workpiece headstock 2. This is provided with a chuck 3, which is driven for rotation and at which there are four jaws 4, which are centrally controlled. 5 designates the machine component to be ground, which will be explained in more detail below.
  • the workpiece headstock 2 has a longitudinal axis 6, which at the same time means the axis of rotation of the chuck 3.
  • the workpiece headstock and the machine component 5 have a common common rotational and longitudinal axis.
  • the workpiece headstock 2 is attached to a grinding table 7. Together with the workpiece headstock 2, the grinding table 7 is moved in the direction of the longitudinal axis 6, which is at the same time the usual Z-axis in the sense of a CNC control.
  • a grinding spindle slide 9 On the machine bed 1 is still a grinding spindle slide 9, which can be moved by means of a Verstellmotors 8 in a direction transverse to the longitudinal axis 6 of the workpiece spindle stock 2.
  • a grinding headstock 10 On the grinding spindle slide 9 a grinding headstock 10 is arranged pivotable about a pivot axis 11. The pivoting direction is indicated by the rotary arrow B. The pivot axis is perpendicular to the grinding spindle slide 9 and will thus normally run vertically.
  • first grinding spindle 12 On the wheelhead are a first grinding spindle 12 and a second grinding spindle 13. The rotation and drive axes of the two grinding spindles are parallel.
  • a first grinding wheel 14 On the grinding spindle 12, a first grinding wheel 14 is attached.
  • the grinding spindle 13 is equipped with a second grinding wheel 16 which is mounted on a grinding mandrel 15. As the FIG. 1 clearly shows, the first grinding wheel 14 and the second grinding wheel 16 are both arranged on the same side of the grinding headstock 10.
  • FIG. 1 is the first processing phase of the grinding process shown, in which the first grinding wheel 14 abuts with its peripheral surface on the effective surface to be ground of the machine component 5.
  • FIG. 2 in otherwise the same view represents the second processing phase in which the axis of the second grinding wheel 16 extends at a distance parallel to the longitudinal axis 6 of the workpiece spindle stock 2.
  • the grinding spindle slide 9 in the direction of the X-axis, ie transverse to the direction of the longitudinal axis 6, something to be driven outwards. Then, the grinding headstock 10 can be pivoted on the grinding spindle slide 9 by an angle of slightly more than 90 °, after which the second grinding spindle 13 with the second grinding wheel 16 from FIG. 2 apparent position. The pivoting movement is also in FIG. 2 again indicated by the rotary arrow B.
  • FIG. 3 shows the machine component to be ground 5 in an enlarged sectional view.
  • the machine component is rotationally symmetrical to the rotation and longitudinal axis 17. It consists of a hub part 18 and a conical flange 19 and is penetrated over its entire length by the longitudinal bore 20.
  • the longitudinal bore can be stepped, so that does not have to be ground on the entire length. In general, it is sufficient if the longitudinal bore on the axial sections 21, 22 and 23 is ground.
  • the conical flange 19 is formed at its large end face and end face in the manner of a flat truncated cone with a straight contour in cross section.
  • the illustrated machine component serves as a conical disk in a continuously variable transmission; in the assembled state slides on the active surface 24, a chain, a belt or the like.
  • two active surfaces 24 face each other; by changing the mutual distance, the radius on which the chain or belt slides can be changed, resulting in different gear ratios.
  • FIG. 3 shown machine component has a cylindrical clamping surface 25 and flat stop surface 26, which serve for clamping in the already mentioned chuck 3.
  • the clamping jaws 4 enclose the cylindrical clamping surface 25, while the axial stop is ensured by the stop surface 26 on the clamping jaws 4.
  • the machine component 5 is thus tensioned on one side outside, so that the entire end face extending in FIG. 3 located on the right side, and especially the active surface 24 are free for editing.
  • a small grinding wheel can be inserted into the longitudinal bore 20 for the purpose of internal grinding.
  • FIG. 4 is the first processing phase shown, in which the active surface 24 of the machine component 5 is ground by vertical grinding.
  • the machine component 5 is clamped between the clamping jaws 4 of the chuck 3.
  • the workpiece spindle is then driven for rotation, usually by a variable speed electric motor.
  • the machine component 5 rotates about its rotational and longitudinal axis 17, which is now identical to the longitudinal axis 6 of the workpiece spindle stock 2.
  • the first grinding spindle 12 with the first grinding wheel 14 has already been based on FIG. 1 described position.
  • the machine table 7 with the workpiece headstock 2 in the direction of the Z-axis in FIG. 4 The axial extension 28 of the second grinding wheel 14 is slightly larger than the radial oblique extension of the machine component 5.
  • the entire active surface 24 by the first grinding wheel 14 sanded in the vertical grinding process with the advantages described above.
  • the first grinding wheel 14 is a ceramic-bonded CBN wheel, which ensures long service life.
  • FIG. 5 illustrates the second processing phase, which is in accordance with the view FIG. 2 equivalent.
  • the second grinding wheel 16 already in the The axis of rotation of the second grinding wheel 16 is located at a distance parallel to the common longitudinal axis 6 of the workpiece spindle stock 2 and the machine component 5.
  • an internal cylindrical grinding at the sections 21, 22 and 23 the longitudinal bore 20 made, this cylindrical grinding can be done as longitudinal grinding, peeling grinding or plunge grinding.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
EP03784116A 2002-08-05 2003-07-30 Verfahren und system zum schleifen eines mit einer längsbohrung versehenen rotationssymmetrischen maschinenbauteils Expired - Fee Related EP1526946B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10235808 2002-08-05
DE10235808A DE10235808B4 (de) 2002-08-05 2002-08-05 Verfahren und Vorrichtung zum Schleifen eines mit einer Längsbohrung versehenen rotationssymmetrischen Maschinenbauteils
PCT/EP2003/008437 WO2004014606A1 (de) 2002-08-05 2003-07-30 Verfahren und vorrichtung zum aussen- und innenschleifen eines mit einer längsbohrung versehenen rotationssymmetrischen maschinenbauteils

Publications (2)

Publication Number Publication Date
EP1526946A1 EP1526946A1 (de) 2005-05-04
EP1526946B1 true EP1526946B1 (de) 2011-01-05

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EP03784116A Expired - Fee Related EP1526946B1 (de) 2002-08-05 2003-07-30 Verfahren und system zum schleifen eines mit einer längsbohrung versehenen rotationssymmetrischen maschinenbauteils

Country Status (12)

Country Link
US (1) US7083500B2 (es)
EP (1) EP1526946B1 (es)
JP (1) JP4226551B2 (es)
KR (1) KR20050038009A (es)
CN (1) CN100387395C (es)
AU (1) AU2003255329A1 (es)
BR (1) BR0313201A (es)
CA (1) CA2492834A1 (es)
DE (2) DE10235808B4 (es)
ES (1) ES2359238T3 (es)
RU (1) RU2320467C2 (es)
WO (1) WO2004014606A1 (es)

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CA2492834A1 (en) 2004-02-19
KR20050038009A (ko) 2005-04-25
AU2003255329A1 (en) 2004-02-25
US7083500B2 (en) 2006-08-01
RU2320467C2 (ru) 2008-03-27
DE10235808A1 (de) 2004-02-26
EP1526946A1 (de) 2005-05-04
AU2003255329A8 (en) 2004-02-25
RU2005106218A (ru) 2005-07-27
JP4226551B2 (ja) 2009-02-18
BR0313201A (pt) 2005-06-28
CN1675029A (zh) 2005-09-28
US20050260926A1 (en) 2005-11-24
CN100387395C (zh) 2008-05-14
JP2006509639A (ja) 2006-03-23
ES2359238T3 (es) 2011-05-19
DE10235808B4 (de) 2009-08-20
WO2004014606A1 (de) 2004-02-19
WO2004014606A8 (de) 2005-12-08

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