WO2006050618A1 - Centering device - Google Patents
Centering device Download PDFInfo
- Publication number
- WO2006050618A1 WO2006050618A1 PCT/CH2005/000143 CH2005000143W WO2006050618A1 WO 2006050618 A1 WO2006050618 A1 WO 2006050618A1 CH 2005000143 W CH2005000143 W CH 2005000143W WO 2006050618 A1 WO2006050618 A1 WO 2006050618A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- workpiece
- center
- rotating
- marking
- centering device
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M1/00—Testing static or dynamic balance of machines or structures
- G01M1/14—Determining unbalance
- G01M1/16—Determining unbalance by oscillating or rotating the body to be tested
- G01M1/26—Determining unbalance by oscillating or rotating the body to be tested with special adaptations for marking, e.g. by drilling
Definitions
- the invention relates to the field of workpiece centering, it relates to the manufacture of a center at the exact geometric location.
- the geometrically defined location of the center of the workpiece must be determined and marked as accurately as possible beforehand.
- marking is understood to mean the attachment of a center mark in the form of a hole, such as drilling, grinding or milling by means of a corresponding machine.
- the locus In balance centering, the locus is searched for using two independent machines, a vertical balancing machine, and the center is machined on a center grinder.
- the workpiece has to be re-clamped, which can lead to relatively large clamping and position errors.
- the geometric location of the grinding head axis of the center grinding machine is not clear. It must therefore be randomly checked a finished center on a workpiece in a complex measurement method using a measuring machine. This review and a vulnerable correction is very labor and time consuming.
- Absolute security whether the center is in the right place, does not exist until the workpiece is finished. The operator of the machines thus has no possibility to control the accuracy during work.
- the reject and repair costs associated with balance centering are high.
- the object of the invention is to provide a centering device for determining and marking the center of a workpiece, which allows an accurate and clearly reproducible centering of a workpiece.
- Next is to be created a centering for centering a workpiece with such a centering device.
- the centering device is based on a balancing machine for measuring an imbalance of a workpiece and comprises turning means for rotating the workpiece resting on the rotating means and measuring means for measuring an imbalance of the rotating workpiece. Furthermore, the centering device according to the invention comprises fastening means for holding the workpiece resting arbitrarily on the rotating means, displacement means for displacing the workpiece resting on the rotating means when the fastening means are loosened on the rotating means and marking means for marking the center of the workpiece.
- the centering device according to the invention can be used for exact marking of a center of rotation on workpieces with complex shapes by producing an exact centering bore or by specifying a prefabricated, coarse alignment centering bore in the center of rotation.
- the marking or processing is done by drilling, milling or grinding.
- workpieces may be, for example, turbine wheels made by precision casting for exhaust gas turbochargers or other rotating precision castings.
- the centering device makes it possible to find the geometrically defined location of the center of the complicated workpiece with great accuracy and to produce a center marking (bore), to control it and to record it in the form of residual imbalance.
- the centering device according to the invention for determining and marking the center of a workpiece and the centering method according to the invention for centering a workpiece with a centering device will be explained in greater detail below with reference to the drawings. This shows
- Fig. 1 is a schematic top view of a centering device with a workpiece to be centered
- FIG. 2 is a schematic front view of the centering device of FIG. 1.
- FIG. 1 The two figures show schematically an embodiment of the inventive centering device, wherein in Fig. 1, the centering device from above with a view of the workpiece to be centered and in Fig. 2, the centering device is shown in a side view from the front.
- the centering device comprises a balancing table 10 with a rotatable part, the balancing spindle 11, which is driven for example by an electric motor via a belt and is rotatable about the center of rotation 12, or in side view about the axis passing through the center of rotation.
- the balancing spindle 11 serves to receive a workpiece 60 to be centered.
- a vacuum pump 13 is provided with which the workpiece of the balancing spindle 11 is firmly sucked by way of air ducts shown schematically in FIG.
- the workpiece is fastened to the balancing spindle by means of a vacuum which can be switched on and off.
- a simple adapter can be provided between the balancing spindle and the workpiece adapted to the workpiece.
- the imbalance measuring unit comprises a mechanical sensor and electronics connected to the sensor, which in turn is connected to a computer to display the measured imbalance store or approximately in one of the eccentricity of a arranged on the balancing spindle workpiece with respect to the center of rotation corresponding length specification to convert.
- the centering device further comprises a displacement means 30 with which can be moved on the balancing spindle 11 in a certain direction.
- the displacement means is designed as a force arm 30, which can be moved in the direction of the x-axis in the indicated coordinate system. With the power arm thus the workpiece 60 can be moved on the balancing spindle in the direction of the x-axis.
- a dial gauge 20 is provided with which the exact position of the workpiece on the balancing spindle can be measured.
- the dial gauge is used to determine the position before and after but especially during the movement of the workpiece by the power arm.
- the centering device further comprises a marking device with a milling or grinding head 41, with which the workpiece rotating on the spindle can be provided with a center bore or bevel (funnel-shaped bevelled edge).
- a marking device with a milling or grinding head 41, with which the workpiece rotating on the spindle can be provided with a center bore or bevel (funnel-shaped bevelled edge).
- a support 40 milling or grinding head 41 on the one hand from the outside to move over the workpiece, and on the other hand, depending on the workpiece from above down to a desired machining depth.
- other tools may be provided, such as to edit the workpiece after centering, for example by grinding or milling.
- the centering device further comprises a cover or guard 50, which prevents the throwing away of the workpiece during the balancing run by being placed over the workpiece to protect man and machine.
- the workpiece to be centered is placed on the working surface of the centering device.
- the workpiece depending on the size and weight, by hand or by means of a crane placed on the balancing table.
- the first alignment of the workpiece with respect to the center of rotation of the balancing spindle 11 takes place manually, or, for example, if a crane is used to move the workpiece only approximately and without more precise control.
- the crane may be provided with a vacuum bell or gripping device.
- the workpiece can be pushed against a 2-point stop 31, for example.
- the stop may for example consist of two butt-jointed legs (prism), which can be moved via an arm to a predefined location in the region of the center of rotation of the balancing spindle 11.
- the second step a first balancing run.
- the workpiece is firmly connected to the balancing spindle.
- a vacuum connection in which with the vacuum pump 13 through openings in the balancing spindle 11 air is sucked away between the workpiece and the balancing table, creating a negative pressure, thanks to which the workpiece is firmly sucked on balancing table.
- the workpiece can be fixed by non-positive or ferromagnetic workpieces by magnetic connection on the balancing spindle.
- a protective cover 50 can be placed over the workpiece 60 before each balancing run.
- the balancing spindle runs at a low balancing speed of, for example, 400 revolutions per minute (RPM).
- RPM revolutions per minute
- an unbalance measuring device of the centering device measures the imbalance of the rotating workpiece.
- a computer connected to the dial gauge calculates from the measured imbalance and the mass of the workpiece the eccentricity (E) of the workpiece with respect to the axis of rotation of the balancing spindle. After the measurement has been completed, the rotation is stopped and the possibly existing protective cover is opened.
- the workpiece is displaced by means of a force arm 30 on the balancing table in accordance with the measured unbalance and the eccentricity calculated therefrom.
- the workpiece 60 is aligned by means of the balancing spindle such that the position of the largest imbalance with the direction of displacement of the power arm 30 is congruent.
- a two-dimensional coordinate system with XY axes arranged at right angles to one another is introduced on the surface of the balancing table, and if the force arm can be moved in the direction of the X axis, for example, the workpiece with the side with the greatest imbalance becomes in the direction of the X axis turned to the power arm.
- the force arm is formed in the contact point to the workpiece so that it can move the workpiece in a defined direction.
- connection between the workpiece and the balancing spindle is released in order then to be able to displace the workpiece by the value of the eccentricity with the force arm 30 in order to eliminate the imbalance.
- the position of the workpiece 60 on the balancing table can be checked by means of a dial gauge 20 before and after the displacement.
- the dial gauge can be automatically guided to the workpiece. If the dial gauge, as shown in the figures, mounted opposite to the direction of displacement of the power arm 30 on the opposite side of the workpiece 60, the sliding operation can be controlled directly during the activity of the power arm. This allows a fast and precise alignment of the workpiece.
- the elastic influences of the arrangement (such as the rigidity of the balancing spindle) under the force application by means of force arm, can be observed continuously by means of the dial gauge and taken into account in the displacement.
- the second and optionally further balancing runs of the rotating part of the balancing table is turned up with the workpiece to a higher balancing speed than the first balancing run.
- balancing speeds of about 1200 rpm can be driven.
- the imbalance is measured and the possibly existing eccentricity is calculated.
- the workpiece is moved in accordance with the third step described above on the balancing counter to the direction of the largest imbalance and then balanced again and measured. This is iteratively repeated as long as the Imbalance or the calculated eccentricity is above a tolerance specification.
- the residual imbalance values can be stored in a buffer for later evaluations or printed out on a piece of paper, for example.
- the fourth step of the centering process the marking or processing of the rotation center of the workpiece, can be continued.
- a central bore is introduced into the workpiece by means of a milling or grinding device arranged above the axis of rotation of the balancing table. If the workpiece is already provided with a prefabricated central bore, this is specified by milling or grinding, for example by grinding a center bevel at the transition from the flat surface in the area around the center bore to the center hole.
- the milling device which can be brought, for example, on a horizontal support 40 from the outside over the balancing table comprises a vertically displaceable to the balancing table milling head 41 with a grinding or milling spindle, which when marking the workpiece to a certain depth with a relatively low speed machined by maybe about 10-20 rpm rotating workpiece.
- the grinding wheel or cutter axis is set obliquely to the axis of rotation of the balancing spindle.
- tangential starting of the grinding or milling spindle and by continuous delivery of the grinding or milling spindle to the axis of rotation of the balancing spindle is generated by rolling a rounded center hole. It is achieved with the rounded center bore, that the bore shroud and plane surfaces adjoining the center bore need not be machined with additional steps. With a normal, conical center hole, this would be necessary for a precision center.
- the feed of the milling / grinding device is stopped.
- the milling device can be retracted a few millimeters to then, depending on the appearance of the bore, if necessary, to create a slightly deeper hole.
- the visual Control can also be done during processing via a mirror or directly.
- the inventive method ensures with the production of the center hole in a clamping with the last balancing run for the greatest possible accuracy. To check this, it can be determined with an unbalance measurement in a control balancing run that during the machining at the center of the workpiece no change in position of the workpiece has taken place on the balancing table.
- the workpiece After completion of the machining process and verification, the workpiece is released from the balancing spindle and removed by hand or by means of a crane from the balancing table.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112005002726T DE112005002726A5 (en) | 2004-11-11 | 2005-03-10 | centering |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH18682004 | 2004-11-11 | ||
CH1868/04 | 2004-11-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006050618A1 true WO2006050618A1 (en) | 2006-05-18 |
Family
ID=34960852
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CH2005/000143 WO2006050618A1 (en) | 2004-11-11 | 2005-03-10 | Centering device |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE112005002726A5 (en) |
WO (1) | WO2006050618A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102015111789B3 (en) * | 2015-07-21 | 2016-12-22 | Schenck Rotec Gmbh | Device for aligning a workpiece in a balancing centering device |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1340056A (en) * | 1969-12-16 | 1973-12-05 | Skf Kugellagerfabriken Gmbh | Method for centring a solid of revolution and apparatus for performing the method |
US4644792A (en) * | 1985-06-17 | 1987-02-24 | American Hofmann Corp. | Method and apparatus for determining the mass center of a body |
EP0324222A2 (en) * | 1988-01-11 | 1989-07-19 | Bryant Grinder Corporation | Workpart centreing mechanism for a chuck |
US4852405A (en) * | 1987-02-13 | 1989-08-01 | Carl Schenck Ag | Machine for mass-centering rotors |
EP0350799A2 (en) * | 1988-07-13 | 1990-01-17 | Bryant Grinder Corporation | Automatic workpart centering mechanism for a chuck |
US4941352A (en) * | 1989-05-05 | 1990-07-17 | Gebr. Hofmann Gmbh & Co. Kg Maschinenfabrik | Method and apparatus for mass centering of a rotor |
-
2005
- 2005-03-10 WO PCT/CH2005/000143 patent/WO2006050618A1/en not_active Application Discontinuation
- 2005-03-10 DE DE112005002726T patent/DE112005002726A5/en not_active Withdrawn
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1340056A (en) * | 1969-12-16 | 1973-12-05 | Skf Kugellagerfabriken Gmbh | Method for centring a solid of revolution and apparatus for performing the method |
US4644792A (en) * | 1985-06-17 | 1987-02-24 | American Hofmann Corp. | Method and apparatus for determining the mass center of a body |
US4852405A (en) * | 1987-02-13 | 1989-08-01 | Carl Schenck Ag | Machine for mass-centering rotors |
EP0324222A2 (en) * | 1988-01-11 | 1989-07-19 | Bryant Grinder Corporation | Workpart centreing mechanism for a chuck |
EP0350799A2 (en) * | 1988-07-13 | 1990-01-17 | Bryant Grinder Corporation | Automatic workpart centering mechanism for a chuck |
US4941352A (en) * | 1989-05-05 | 1990-07-17 | Gebr. Hofmann Gmbh & Co. Kg Maschinenfabrik | Method and apparatus for mass centering of a rotor |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102015111789B3 (en) * | 2015-07-21 | 2016-12-22 | Schenck Rotec Gmbh | Device for aligning a workpiece in a balancing centering device |
US10024748B2 (en) | 2015-07-21 | 2018-07-17 | Schenck Rotec Gmbh | Device for aligning a workpiece in a mass-centring device |
Also Published As
Publication number | Publication date |
---|---|
DE112005002726A5 (en) | 2008-02-07 |
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