EP0074432A2 - Dispositif pour le déplacement contrôlé d'une table porte-pièce d'une machine-outil, principalement d'une meuleuse pour pièces planes - Google Patents

Dispositif pour le déplacement contrôlé d'une table porte-pièce d'une machine-outil, principalement d'une meuleuse pour pièces planes Download PDF

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Publication number
EP0074432A2
EP0074432A2 EP81109468A EP81109468A EP0074432A2 EP 0074432 A2 EP0074432 A2 EP 0074432A2 EP 81109468 A EP81109468 A EP 81109468A EP 81109468 A EP81109468 A EP 81109468A EP 0074432 A2 EP0074432 A2 EP 0074432A2
Authority
EP
European Patent Office
Prior art keywords
way valve
tachometer generator
supporting table
surface grinding
work supporting
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Withdrawn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
EP81109468A
Other languages
German (de)
English (en)
Other versions
EP0074432A3 (fr
Inventor
Franco Fontanella
Ezio Merlino
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.)
Officina Meccanica Favretto SpA
Original Assignee
Officina Meccanica Favretto SpA
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 Officina Meccanica Favretto SpA filed Critical Officina Meccanica Favretto SpA
Publication of EP0074432A2 publication Critical patent/EP0074432A2/fr
Publication of EP0074432A3 publication Critical patent/EP0074432A3/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Withdrawn legal-status Critical Current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
    • B24B47/00—Drives or gearings; Equipment therefor
    • B24B47/20—Drives or gearings; Equipment therefor relating to feed movement

Definitions

  • the above invention relates to a device for the controlled displacement of a workpiece receiving table of a machine tool, mainly a surface grinding machine. It is generally known that for clamping and unloading workpieces to be ground, on or from a machine tool table, as well as for moving the workpiece to the grinding wheel, or for checking the vertical or horizontal working position of the grinding wheel with respect to the workpiece, and for Removing the workpiece in the longitudinal direction from the working area of the grinding wheel, and for carrying out measurement and control work during the machining of the workpiece, grinding machines have a device consisting of a gear and rack. By switching off the usual drive device for the movement of the machine table holding the workpiece, the gearwheel with the Rack brought into operative connection.
  • the gear wheel in turn is operatively connected to a handwheel, which can be rotated in order to enable a manual displacement of the workpiece mounting table, for the reasons already described above.
  • a handwheel which can be rotated in order to enable a manual displacement of the workpiece mounting table, for the reasons already described above.
  • the use of a toothed rack and a gearwheel that can be driven by a handwheel requires considerable effort to move the workpiece receiving table, which increases with the length of the workpiece receiving table and depending on the weight of the workpiece to be ground.
  • the workpiece receiving table can only be moved at a low speed, but it would be desirable, especially with large machines, to carry out the workpiece approaching the grinding wheel at a higher speed, and this feed speed only in the immediate vicinity to reduce the grinding wheel.
  • the provision of the rack which must inevitably extend over the entire length of the workpiece receiving table, and the provision of a suitable device for engaging and disengaging the drive gear, which is operatively connected to a handwheel, represent a not inconsiderable mechanical engineering effort.
  • the object of the above invention is a device to propose, with which a controlled displacement by hand of the workpiece receiving table can be carried out simply and quickly at any speed and without any physical effort on the part of the operator, and makes it possible to move the workpiece receiving table by hand in both feed directions of the table, without having to set the machining sizes previously set for the normal processing of the. Workpieces have been selected, have to influence or delete.
  • an electrically controllable multi-way valve which is used to control a hydraulic piston, which is provided for the reciprocating drive of the workpiece receiving table, is assigned a tachometer generator, which can be driven via a handwheel, and its generated electrical current Multi-way valve can be supplied as a control signal.
  • the machine tool e.g. a grinding machine (not shown) is assigned a control panel 1, which has buttons and switches (not shown) in the individual fields 2 and 3 in order to operate and control the machine tool in the usual way.
  • a tachometer generator is installed at a suitable point on the control panel 1, which is identified overall by 4.
  • the tachometer generator 4 has a drive wheel 5, the shaft 6 of which is connected to the rotor of the tachometer generator 4.
  • an actuating handle 7 protrudes from it.
  • FIG. 2 schematically shows the electronic circuit and other parts essential to the invention.
  • the components of the electronic circuit are already known and can be found in the publication "Technical Information GB-V-1003" from Sperry Vickers, where on pages 11 to 15 an electronic card ( KG-06 Eurocard 0784252), which makes it possible to operate and control an electrically controllable 4-way valve (model KG 06-11), as is also described in this document.
  • a tachometer generator 4 is provided in the manner already described, the stator of which has two outputs 8 and 9 (positive and negative output), which in turn are connected to the inputs of an amplifier 10, the output line 11 of which, before it is connected to a trigger 12, has a fork in order to continue via a line 13 to a switch or breaker 14.
  • the switch 14 is provided in order to switch the entire drive and control system from manual switching (M) to automatic operation (A).
  • M manual switching
  • A automatic operation
  • the output 16 of the smoothing element is connected to a further amplifier 17, and a further input of the amplifier 17 is connected to an oscillator 18 which is provided for setting and regulating the speed signal.
  • the electrical control unit of a known valve 19 (Sperry Vickers Technical Information GB-V1003) is connected via the output lines 28.
  • the inlet opening and the return opening of the valve 19 are connected via pipes 20 and 21 to a hydraulic piston-cylinder unit 22, the piston rod 23 of which is operatively connected to the workpiece receiving table 24 of the machine tool.
  • the multi-way valve 19 is blocked and the piston-cylinder unit 22 is therefore unable to move the workpiece receiving table 24 in one direction or the other.
  • the tachogenerator By rotating the handwheel 5 of the tachogenerator 4, rotary movement which is carried out by the operator of the machine tool in the direction of the arrow f (FIG. 2), the tachogenerator generates an electrical current which, depending on the direction of rotation (f), produces a positive value ( +) or a negative value (-).
  • the electrical current transmitted through the lines 8, 9 to the input of the amplifier 10 is amplified by the amplifier 10 in order to be supplied to an electrical or electronic smoothing element 15 via the electrical lines and the switch 14.
  • the electrical smoothing element 15 smoothes the supplied electrical current signals, in order to suppress signal jumps or steps which can occur due to the acceleration or deceleration during the drive of the tachometer generator.
  • the smoothing element 15 emits a smoothed and approximately uniform signal 16 at its output, which signal is fed to a further amplifier 17, to which an oscillator 18 is assigned which makes it possible to adjust and preset the basic feed rate of the machine tool table.
  • the amplifier 17 depending on the direction of rotation of the tachogenerator, emits a corresponding positive or negative current signal, which is fed to the hydraulic multi-way valve 19 (proportional valve), which means that the electrically controllable valve 19 is more or less its own Through openings to the lines 20 and 21, which act on the piston-cylinder unit 22, are opened or closed.
  • the hydraulic multi-way valve 19 proportional valve
  • a line of fluid under pressure is directed to the piston cylinder 22 via the line 21, in order to thus shift the piston rod in the direction of the arrow g, or by supplying the pressure fluid via the line 20, the piston 22 is displaced such that the piston rod 23 is shifted in the direction indicated by h.
  • These two feed directions of the piston-cylinder unit are determined by the polarity (+ or -) of the current output by the tachometer generator 4, as a result of which valve 19 is controlled in a suitable manner.
  • the solution according to the invention provides the operator of a machine tool, mainly a surface grinding machine, with inexpensive and reliable means of making it possible to carry out a controlled displacement of a workpiece receiving table 24 by hand in the desired manner and at the desired speed, this manual operation being neither mechanical Engaging, still disengaging conventional machine components.
  • the controlled one The machine table can be moved by hand, however, in a simple manner and without any effort, directly from the control and operating panel of the machine tool. Furthermore, when switching from automatic operation to manual operation, the previously entered machining sizes of the machine are not deleted, but are always available again for the automatic machining of the workpiece.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
EP81109468A 1981-09-14 1981-10-31 Dispositif pour le déplacement contrôlé d'une table porte-pièce d'une machine-outil, principalement d'une meuleuse pour pièces planes Withdrawn EP0074432A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2395481 1981-09-14
IT23954/81A IT1139156B (it) 1981-09-14 1981-09-14 Mezzi per mouvere manualmente la tavola porta-pezzo di una macchina utensile,in particolare di una rettificatrice per piani

Publications (2)

Publication Number Publication Date
EP0074432A2 true EP0074432A2 (fr) 1983-03-23
EP0074432A3 EP0074432A3 (fr) 1984-05-23

Family

ID=11211114

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81109468A Withdrawn EP0074432A3 (fr) 1981-09-14 1981-10-31 Dispositif pour le déplacement contrôlé d'une table porte-pièce d'une machine-outil, principalement d'une meuleuse pour pièces planes

Country Status (2)

Country Link
EP (1) EP0074432A3 (fr)
IT (1) IT1139156B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3928113C1 (en) * 1989-08-25 1991-01-31 Maschinenfabrik Ernst Thielenhaus Gmbh, 5600 Wuppertal, De Precision grinding machine tool holder - has top part swinging on horizontal axis while workpiece holder rotates on vertical axis

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1068795B (de) * 1959-11-12 The Cincinnati Milling Machine Co., Cincinnati, Ohio (V. St. A.) Handservosteuereinrichtung für Werkzeugmaschinen
DE2255724A1 (de) * 1972-05-24 1973-12-06 Ferrera Renato Della Vorrichtung fuer die steuerung eines hin- und hergehenden werkzeugmaschinenschlittens
FR2242198A1 (fr) * 1973-08-28 1975-03-28 Ruhla Uhren Masch Veb K
EP0066501A1 (fr) * 1981-05-18 1982-12-08 Centre D'etudes Du Fraisage (C.E.F.) Dispositif de commande pour machine-outil

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1068795B (de) * 1959-11-12 The Cincinnati Milling Machine Co., Cincinnati, Ohio (V. St. A.) Handservosteuereinrichtung für Werkzeugmaschinen
DE2255724A1 (de) * 1972-05-24 1973-12-06 Ferrera Renato Della Vorrichtung fuer die steuerung eines hin- und hergehenden werkzeugmaschinenschlittens
FR2242198A1 (fr) * 1973-08-28 1975-03-28 Ruhla Uhren Masch Veb K
EP0066501A1 (fr) * 1981-05-18 1982-12-08 Centre D'etudes Du Fraisage (C.E.F.) Dispositif de commande pour machine-outil

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3928113C1 (en) * 1989-08-25 1991-01-31 Maschinenfabrik Ernst Thielenhaus Gmbh, 5600 Wuppertal, De Precision grinding machine tool holder - has top part swinging on horizontal axis while workpiece holder rotates on vertical axis

Also Published As

Publication number Publication date
IT1139156B (it) 1986-09-24
EP0074432A3 (fr) 1984-05-23
IT8123954A0 (it) 1981-09-14

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Inventor name: FONTANELLA, FRANCO

Inventor name: MERLINO, EZIO