WO2012089852A1 - Table de guidage pour machine outil - Google Patents

Table de guidage pour machine outil Download PDF

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Publication number
WO2012089852A1
WO2012089852A1 PCT/ES2010/000532 ES2010000532W WO2012089852A1 WO 2012089852 A1 WO2012089852 A1 WO 2012089852A1 ES 2010000532 W ES2010000532 W ES 2010000532W WO 2012089852 A1 WO2012089852 A1 WO 2012089852A1
Authority
WO
WIPO (PCT)
Prior art keywords
machine tools
drives
mobile plate
plate
mobile
Prior art date
Application number
PCT/ES2010/000532
Other languages
English (en)
Spanish (es)
Inventor
Harkaitz URRETA PRIETO
Mikel Zatarain Gordoa
Original Assignee
Ideko, S. Coop.
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 Ideko, S. Coop. filed Critical Ideko, S. Coop.
Priority to PCT/ES2010/000532 priority Critical patent/WO2012089852A1/fr
Publication of WO2012089852A1 publication Critical patent/WO2012089852A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
    • B23Q1/25—Movable or adjustable work or tool supports
    • B23Q1/44—Movable or adjustable work or tool supports using particular mechanisms
    • B23Q1/56—Movable or adjustable work or tool supports using particular mechanisms with sliding pairs only, the sliding pairs being the first two elements of the mechanism
    • B23Q1/60—Movable or adjustable work or tool supports using particular mechanisms with sliding pairs only, the sliding pairs being the first two elements of the mechanism two sliding pairs only, the sliding pairs being the first two elements of the mechanism
    • B23Q1/62—Movable or adjustable work or tool supports using particular mechanisms with sliding pairs only, the sliding pairs being the first two elements of the mechanism two sliding pairs only, the sliding pairs being the first two elements of the mechanism with perpendicular axes, e.g. cross-slides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
    • B23Q1/25—Movable or adjustable work or tool supports
    • B23Q1/44—Movable or adjustable work or tool supports using particular mechanisms
    • B23Q1/48—Movable or adjustable work or tool supports using particular mechanisms with sliding pairs and rotating pairs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
    • B23Q1/25—Movable or adjustable work or tool supports
    • B23Q1/44—Movable or adjustable work or tool supports using particular mechanisms
    • B23Q1/50—Movable or adjustable work or tool supports using particular mechanisms with rotating pairs only, the rotating pairs being the first two elements of the mechanism
    • B23Q1/54—Movable or adjustable work or tool supports using particular mechanisms with rotating pairs only, the rotating pairs being the first two elements of the mechanism two rotating pairs only
    • B23Q1/545—Movable or adjustable work or tool supports using particular mechanisms with rotating pairs only, the rotating pairs being the first two elements of the mechanism two rotating pairs only comprising spherical surfaces
    • B23Q1/5462—Movable or adjustable work or tool supports using particular mechanisms with rotating pairs only, the rotating pairs being the first two elements of the mechanism two rotating pairs only comprising spherical surfaces with one supplementary sliding pair

Definitions

  • the present invention is related to the systems used for the drive of component parts of machine tools, specifically the invention refers to a guide table based on a parallel kinematics that allows high precision movements to be applied to the grinding head of a grinding machine.
  • the grinding head of a grinding machine needs to perform three types of movements when it comes to machining any type of part. These movements are, a translating movement transverse to the piece to be machined, an advance movement to penetrate the piece, and a turning movement to position the wheel with a certain angle of attack with respect to the piece to be machined.
  • the conventional solutions used to provide the three movements prior to the grinding head of a grinding machine are based on using a table consisting of superimposed support planes, so that each plane provides a degree of freedom to the head, a plane for the translation in an OX axis, a plane for the translation in an OY axis, and another plane to make a rotation on an OZ axis.
  • This solution has the disadvantage of occupying a high space in height as well as presenting a low precision in the movements.
  • machines based on parallel kinematics are being used. A parallel kinematics machine does not obtain its movement by performing the movements one on the other as it happens in the traditional machine tools based on Cartesian axes, but the machine head can be placed at any point of the space and with any orientation through joint action of several drives.
  • parallel kinematics machines are architectures in which a mobile base joins a fixed one through two or more kinematic chains.
  • Hexapods based on the Steward platform are currently used for the movement of machining heads.
  • Hexapods are based on six telescopic arms, ball joints and cardan joints, so that by varying the length of the telescopic arms, absolute mobility (6 degrees of freedom) is achieved at the end of the head where the tool is arranged.
  • a table is proposed to carry out the guidance and operation of the grinding head of a grinding machine with high precision, however this application is not limiting, this table can be used as a table that carries parts to be machined, or It can be applied to other types of machine tools other than grinding machines, such as milling machines, boring machines, etc.
  • the guiding table for machine tools object of the invention is constituted by a mobile plate that is supported on a seat with total freedom of movement, and where the mobile plate is connected by means of articulated bars at its ends to drives that are arranged on the same horizontal plane, said drives being driven by independent motors.
  • a low-height guiding table is obtained that allows two horizontal translation movements and one rotation movement to be performed on a single plane.
  • the drives of the guiding table for machine tools are three, two of them arranged in parallel with each other and the third arranged in a position perpendicular to the other two.
  • the guiding table is provided with a system of acquisition to determine the position of the movable plate and therefore of the grinding head of the grinding machine or the workpiece according to the application conferred on the table.
  • the mobile plate is arranged on the seat by means of hydrostatic bearings, which in order to achieve the necessary stiffness and therefore to allow precise movements must be preloaded, by adding mass to the mobile plate, by means of a system of empty, or by a magnetic attraction system.
  • the movable plate can also be arranged on the seat by other means, such as by an air mattress or other type of fluid, or by ball rolling.
  • the collection system for determining the position of the mobile plate is a direct measurement system based on a mesh encoder that is arranged directly on the mobile plate.
  • Indirect measurement systems can also be used, such as linear encoders arranged in each drive or rotational encoders arranged over each motor of the drives.
  • Other direct measurement systems that can be used are an interferometry system laser, or a local tracking system.
  • the drives for conferring the movement to the mobile plate are preferably operated by linear motors, it being also possible that they can be operated by translation spindles, pinion-rack transmissions, hydraulic cylinders, electrodynamic exciters, piezoelectric actuators, or a combination thereof.
  • a machine tool table is thus obtained which, due to its constructive and functional characteristics, is a preferred application for the function to which it is intended in relation to the guidance and positioning of the grinding head of a grinding machine, allowing three degrees of freedom on a single plane.
  • Figure 1 shows a schematic figure of a guiding table for machine tools according to the object of the invention.
  • Figures 2 ⁇ to 2D show the guiding table object of the invention in different operating positions.
  • Figures 3A to 3D show some examples of realization of the guiding table where movements are restricted by eliminating some drives.
  • the guiding table object of the invention is constituted by a mobile plate (1) that is supported on a seat (2) with a zero or practically zero friction coefficient, which gives the mobile plate (1) a total freedom of movements on the horizontal plane of the seat (2).
  • the mobile plate (1) is connected by bars (3), which are articulated at their ends, to drives (4) that are moved independently by respective motors (not shown).
  • All drives (4) are arranged on the same horizontal plane so that the guide table has a reduced height compared to conventional solutions of several superimposed planes.
  • the guiding table is preferably used to arrange a grinding head of a grinding machine coupled to the mobile plate (1), but it can also be used as a carrier table of a workpiece (s) to be machined.
  • the application of the invention to grinding machines is not limiting, and the guiding table can be used in other types of machine tools, such as milling machines, boring machines or others.
  • the guide table has three drives (4) arranged on the same plane, where two of them are arranged in line and parallel to each other, and the third perpendicular to the other two.
  • the three drives (4) By means of an interpolation of the movements performed by the three drives (4), two degrees of freedom are achieved on the same horizontal plane by two movements of horizontal translation of the mobile plate (1) on axes (OX, OY) and a degree of freedom by means of a rotation movement (a) of the movable plate (1) on an axis (OZ).
  • the guide table is provided with a pick-up system (5).
  • the collection system (5) of the table position is a mesh encoder (in English called "Encoder Grid"), which is arranged on the mobile plate (1) for Perform a direct measurement.
  • the mobile plate (1) is arranged on the seat (2) by means of hydrostatic bearings.
  • a basic solution is to make a preload by mass, which consists of using a plate (1) with a weight much greater than the grinding head that is attached to it, or the piece that is arrange if the table is used as a carrier table for parts.
  • Other solutions for preloading hydrostatic bearings consist of using a vacuum system or a magnetic attraction system.
  • other solutions for arranging the mobile plate (1) on the seat (2) consist of using a ball rolling or an air mattress or other type of fluid.
  • the drives (4) that confer movement to the bars (3) and therefore to the mobile plate (1) are driven by linear motors, since they provide high precision, which is basic for the parts grinding operations.
  • the drives (4) can also be operated by linear translation spindles, pinion-rack transmission systems, hydraulic cylinders, electrodynamic exciters, piezoelectric actuators, or even a combination thereof.
  • the joints established between the bars (3) and the drives (4), and between the bars (3) and the mobile plate (1) can be rolling joints, contact ball joints, magnetic joints or joints based on a system of flexible joint
  • Figures 2A to 2D show the three degrees of freedom that the mobile plate (1) possesses to move on the seat (2).
  • Figures 3A to 3D show the possibility of restricting degrees of freedom of the guidance table by eliminating one or more of the drives (4).
  • the guiding table with two degrees of freedom is shown by removing a drive (4)
  • the table is shown with a single degree of freedom by removing two drives (4).
  • the mobile plate (1) has a translation movement on the axis (OX) and a rotation movement (a) on the axis (OZ).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Machine Tool Units (AREA)

Abstract

L'invention concerne une table de guidage pour machine outil, constituée par une plaque (1) mobile portée sur un siège (2) avec une totale liberté de mouvement. La plaque (1) mobile est unie par l'intermédiaire de barres (3) articulées à leurs extrémités à des éléments d'actionnement (4) qui sont disposés sur un même plan horizontal et qui sont mus par des moteurs indépendants, exerçant deux mouvements de translation horizontale de la plaque (1) mobile sur des axes (OX, OY) et un mouvement de rotation (α) de ladite plaque (1) mobile sur un axe (OZ). Ladite table de guidage comprend un système de détection (5) pour déterminer la position de la plaque (1) mobile.
PCT/ES2010/000532 2010-12-30 2010-12-30 Table de guidage pour machine outil WO2012089852A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/ES2010/000532 WO2012089852A1 (fr) 2010-12-30 2010-12-30 Table de guidage pour machine outil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/ES2010/000532 WO2012089852A1 (fr) 2010-12-30 2010-12-30 Table de guidage pour machine outil

Publications (1)

Publication Number Publication Date
WO2012089852A1 true WO2012089852A1 (fr) 2012-07-05

Family

ID=46382334

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/ES2010/000532 WO2012089852A1 (fr) 2010-12-30 2010-12-30 Table de guidage pour machine outil

Country Status (1)

Country Link
WO (1) WO2012089852A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5481576A (en) * 1977-12-09 1979-06-29 Fujitsu Ltd Device to determine the position of a slide table
GB2067932A (en) * 1980-01-25 1981-08-05 Charmilles Sa Ateliers Work support table
EP0314839A1 (fr) * 1986-01-20 1989-05-10 De Haan Mechatronics B.V. Dispositif de positionnement
EP0437741A2 (fr) * 1990-01-16 1991-07-24 International Business Machines Corporation Dispositif de positionnement selon deux-dimensions

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5481576A (en) * 1977-12-09 1979-06-29 Fujitsu Ltd Device to determine the position of a slide table
GB2067932A (en) * 1980-01-25 1981-08-05 Charmilles Sa Ateliers Work support table
EP0314839A1 (fr) * 1986-01-20 1989-05-10 De Haan Mechatronics B.V. Dispositif de positionnement
EP0437741A2 (fr) * 1990-01-16 1991-07-24 International Business Machines Corporation Dispositif de positionnement selon deux-dimensions

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