EP0432703A2 - ProcédÀ© de meulage de surfaces concaves sur pièces de fonderie et appareil pour la mise en oeuvre du procédé - Google Patents

ProcédÀ© de meulage de surfaces concaves sur pièces de fonderie et appareil pour la mise en oeuvre du procédé Download PDF

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Publication number
EP0432703A2
EP0432703A2 EP90123738A EP90123738A EP0432703A2 EP 0432703 A2 EP0432703 A2 EP 0432703A2 EP 90123738 A EP90123738 A EP 90123738A EP 90123738 A EP90123738 A EP 90123738A EP 0432703 A2 EP0432703 A2 EP 0432703A2
Authority
EP
European Patent Office
Prior art keywords
grinding
grinding wheel
wheel
machined
actual
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Withdrawn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
EP90123738A
Other languages
German (de)
English (en)
Other versions
EP0432703A3 (en
Inventor
Hans Dr.-Ing. Heyer
Manfred Dipl.-Ing. Michelberger (Fh)
Wolfgang Mühleisen
Peter Weiss
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.)
Mannesmann Demag Krauss Maffei GmbH
Original Assignee
Krauss Maffei AG
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 Krauss Maffei AG filed Critical Krauss Maffei AG
Publication of EP0432703A2 publication Critical patent/EP0432703A2/fr
Publication of EP0432703A3 publication Critical patent/EP0432703A3/de
Withdrawn legal-status Critical Current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
    • B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
    • B24B19/14—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding turbine blades, propeller blades or the like
    • 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
    • B24B17/00—Special adaptations of machines or devices for grinding controlled by patterns, drawings, magnetic tapes or the like; Accessories therefor
    • B24B17/10—Special adaptations of machines or devices for grinding controlled by patterns, drawings, magnetic tapes or the like; Accessories therefor involving electrical transmission means only, e.g. controlled by magnetic tape

Definitions

  • the invention relates to a method for grinding concave surfaces on castings, in particular on blades of Pelton turbines, the surfaces being machined with a rotating grinding tool in accordance with the difference between the actual oversizes and a nominal oversize table.
  • the invention also relates to an apparatus for performing the method.
  • the object of the invention is to achieve machining of concave surfaces of castings by automated grinding.
  • the surface is ground with a grinding wheel guided by a multi-axis processor-controlled robot arm, the grinding wheel being guided in such a way that an angle is maintained between the plane of rotation of the grinding wheel and the surface area to be machined, which angle decreases with a decreasing radius of curvature of the surface area increases.
  • the grinding wheel can also be brought up to surface areas that are difficult to access. Appropriate movements of the grinding wheel remove the material of the surface to be machined or the surface area to be machined down to the nominal allowance.
  • it is important that the grinding wheel or its plane of rotation is held at an angle to this surface area depending on the curvature of the concave surface area to be machined. This is the only way to achieve a smooth and undulation-free finishing of the surface or surface area.
  • machining can be carried out with a straight grinding wheel, the diameter of which, however, becomes smaller as the machining progresses due to wear.
  • the degree of wear and tear must be determined and used in the program. It is easier if, according to the preferred embodiment of the invention, grinding is carried out with a cup wheel, the diameter of which does not change in the course of processing. Although the height of the cup wheel is reduced, this change can be mastered more easily in terms of measurement technology and programming.
  • the angle at which the plane of rotation of the grinding wheel, in particular cup wheel, and the surface area to be machined is dependent on the diameter of the cup wheel and the radius of curvature of the area to be processed.
  • the angle a - 0.1 xk + 42.5 (degrees). It is understood that smaller deviations up or down of up to 2.5 degrees are permitted.
  • the surface is processed in areas, whereby the areas with the greatest target / actual deviations are first ground.
  • the grinding wheel can be guided several times over the area to be machined.
  • the actual measurements of the processed area or areas should be recorded.
  • the actual dimensions are recorded with the cup wheel as a probe, because then the wear of the cup wheel is also included in the measurement. It is understood that additional control measurements can be made in another way.
  • the surfaces of the castings to be machined are considerably oversized, they can be pre-milled in a CNS-controlled manner with a milling allowance before the grinding machining, so that the workload for the grinding machining is reduced.
  • the invention also relates to a device for carrying out the method described above.
  • the device is characterized by a multi-axis processor-controlled robot arm, on the free end of which a rotating grinding wheel is arranged, the axis of rotation of which extends at an angle to the longitudinal axis of the free end. In this way, even hard-to-reach areas or areas on castings can be achieved.
  • the grinding wheel can be a straight grinding wheel. However, a cup wheel is preferred.
  • the axis of rotation of the grinding wheel preferably extends at a right angle to the longitudinal axis of the free end of the robot arm.
  • the Pelton turbine 1 which is only partially shown in FIG. 1, has on its outer circumference a row of blades 2 which are aligned tangentially to a pitch circle 3 in the usual way.
  • the contour of the concave inner surfaces 4 of the blades 2 to be machined is indicated in FIG. 2 by contour lines 5.
  • a pre-processing by CNS-controlled milling with milling allowance 6 can be carried out.
  • the final processing takes place by grinding with a rotating cup wheel 7, which is arranged at the free end 8 of a multi-axis, processor-controlled robot arm 9.
  • the axis of rotation of the cup wheel 7 extends at a right angle to the longitudinal axis of the free end 8.
  • the cup wheel 7 is guided by the processor-controlled robot arm in accordance with a target measurement table stored in the processor so that an angle is maintained between the plane of rotation of the cup wheel 7 and the surface area to be machined, which increases with decreasing radius of curvature of the surface area.
  • the entire inner surface 4 is processed in areas, with the areas with the greatest target / actual deviations being ground first. This presupposes that the actual measurements are recorded before processing. It is useful to record the actual oversize with the cup wheel 7 as a probe. Even after one or more processing steps, for example after processing one or more surface areas, the actual oversize of the processed area or areas should be recorded. Even then, the cup wheel 7 should be used as a probe, because then the wear of the cup wheel is included in the measurement result and can be processed directly by the processor.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
EP19900123738 1989-12-15 1990-12-10 Process for grinding concave surfaces on casted pieces and device for the application of the process Withdrawn EP0432703A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3941410 1989-12-15
DE19893941410 DE3941410A1 (de) 1989-12-15 1989-12-15 Verfahren zum schleifen von konkaven flaechen an gussstuecken und vorrichtung zur durchfuehrung des verfahrens

Publications (2)

Publication Number Publication Date
EP0432703A2 true EP0432703A2 (fr) 1991-06-19
EP0432703A3 EP0432703A3 (en) 1991-12-11

Family

ID=6395510

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900123738 Withdrawn EP0432703A3 (en) 1989-12-15 1990-12-10 Process for grinding concave surfaces on casted pieces and device for the application of the process

Country Status (3)

Country Link
EP (1) EP0432703A3 (fr)
CS (1) CS624990A2 (fr)
DE (1) DE3941410A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2106876A1 (fr) * 2008-04-04 2009-10-07 Rolls-Royce Deutschland Ltd & Co KG Tubes pour un dispositif d'observation
CN107855569A (zh) * 2017-10-18 2018-03-30 北京工业大学 一种机器人铣削双轴复合刀具装置及方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2919829C2 (de) * 1978-05-17 1984-02-16 Hitachi, Ltd., Tokyo Maschine zum Polieren von Werkstücken
DE3317425A1 (de) * 1983-05-13 1984-08-09 Daimler-Benz Ag, 7000 Stuttgart Halterung fuer ein bearbeitungswerkzeug an einem roboterkopf
FR2625458B1 (fr) * 1987-12-31 1990-05-04 Electricite De France Cellule de meulage

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2106876A1 (fr) * 2008-04-04 2009-10-07 Rolls-Royce Deutschland Ltd & Co KG Tubes pour un dispositif d'observation
US8701287B2 (en) 2008-04-04 2014-04-22 Rolls-Royce Deutschland Ltd & Co Kg Method for aerodynamically shaping the leading edge of blisk blades
CN107855569A (zh) * 2017-10-18 2018-03-30 北京工业大学 一种机器人铣削双轴复合刀具装置及方法

Also Published As

Publication number Publication date
EP0432703A3 (en) 1991-12-11
DE3941410A1 (de) 1991-06-20
CS624990A2 (en) 1991-09-15

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