EP1680261A1 - Dispositif de support - Google Patents

Dispositif de support

Info

Publication number
EP1680261A1
EP1680261A1 EP03775807A EP03775807A EP1680261A1 EP 1680261 A1 EP1680261 A1 EP 1680261A1 EP 03775807 A EP03775807 A EP 03775807A EP 03775807 A EP03775807 A EP 03775807A EP 1680261 A1 EP1680261 A1 EP 1680261A1
Authority
EP
European Patent Office
Prior art keywords
fixture device
workholding fixture
workpiece
workholding
workpieces
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Withdrawn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
EP03775807A
Other languages
German (de)
English (en)
Inventor
Vinicio De Moliner
Marioalberto Biella
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.)
Pade Sas Di De Moliner Vinicio & C
Original Assignee
Pade Sas Di De Moliner Vinicio & C
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 Pade Sas Di De Moliner Vinicio & C filed Critical Pade Sas Di De Moliner Vinicio & C
Publication of EP1680261A1 publication Critical patent/EP1680261A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B5/00—Clamps
    • B25B5/003—Combinations of clamps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B1/00—Vices
    • B25B1/24—Details, e.g. jaws of special shape, slideways
    • B25B1/2484—Supports
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B5/00—Clamps
    • B25B5/006—Supporting devices for clamps

Definitions

  • the present invention relates to a workholding fixture device, in particular for elongated workpieces.
  • the present invention relates to a workholding fixture unit, a fixture table and a corresponding machine for the manufacture of elongated workpieces .
  • the machine tools for elongated workpieces use workholding fixture devices in order to grip the workpiece on suitable tables during machining carried out by special toolholding heads .
  • the prior art workholding fixture devices do not easily allow for the execution of simultaneous machining operations on several workpieces, consequently the relevant machine tools are slow and somewhat unproductive.
  • the known workholding fixture devices require a large amount of space between two adjacent workpieces in order to allow the toolholding head to perform the machining operations simultaneously.
  • the known workholding fixture devices frequently cause encumbrance problems with the toolholding heads whereby they do not allow the execution of all the achinings with a single locking of the workpiece, and require the interruption of the machining and the repositioning of the workpiece, with further prolonging of the production times for the finished workpiece.
  • the prior art workholding fixture devices after having carried out the locking of the workpiece, do not allow the machining of the side and end surfaces of the workpiece along its entire length, thereby requiring additional repositionings.
  • the problem of the present invention is that of providing a workholding fixture device which solves the drawbacks mentioned with reference to the known art. [0008] Such drawbacks and limitations are solved by a workholding fixture device in accordance with claim 1. [0009] Other embodiments of the workholding fixture device according to the invention are described in the subsequent claims .
  • Figure 1 represents a perspective view of a workholding fixture device according to the present invention
  • Figure 2 represents a side view, partially in section, of the workholding fixture device of figure 1, from the side of arrow II of figure 1;
  • Figure 3 represents a perspective view of the workholding fixture device of figure 1, mounted on related supporting means;
  • Figure 4 represents an additional perspective view of the workholding fixture device of figure 1, mounted on related supporting means, according to an additional embodiment;
  • Figure 5 represents a perspective view of a bracket unit comprising workholding fixture devices of figure 1;
  • Figure 6 represents an additional perspective view of a bracket unit comprising workholding fixture devices of figure 1;
  • Figure 7 represents a perspective view of a machine tool for the machining of elongated workpieces comprising the workholding fixture device of figure 1;
  • Figure 8 represents a schematic front view of a machine tool for the machining of elongated workpieces comprising workholding fixture devices according to the invention
  • Figure 9 represents a perspective view of a workpiece table .
  • workpiece P having a prevailing extension E is meant an elongated workpiece P, for example a rod having any cross section or shape with respect to a cross sectional plane perpendicular to said prevailing extension E.
  • Said workpiece P may be intended for ' the manufacture of finished products having an elongated shape, such as for example chair or table legs, made for example in wood or plastic material.
  • Said workpieces P along the prevailing extension E are surrounded by at least one side surface.
  • said side surface may be the cylindrical side surface of a circular, elliptical, square or polygonal cross section cylinder, typically used in the manufacture of chair or table legs .
  • the workholding fixture device 4 comprises a body 10 adapted to interacting with gripping means 16 in order to constrain the workpiece P to the workholding fixture device 4.
  • the body 10 comprises a base 22 adapted to interacting with supporting means 28 of the workholding fixture device .
  • base is meant both the physical surface of the body of the workholding fixture device 4, and a theoretical plane parallel to a plane constituted by the X and Y axes perpendicular to one another together, which are the axes of movement of the tools in the working plane of a machine.
  • the base 22 is for example planar in such a manner that, in one preferred assembly configuration of the workholding fixture device 4 on a relevant machine tool
  • said base 22 is substantially parallel to a support plane S of the machine itself, parallel to a pair of said axes X, Y perpendicular to one another.
  • the body 10 has a prevailing dimension C so that, with respect to a direction perpendicular to said prevailing dimension C a thickness G of the body itself may be defined.
  • the body 10 comprises a reference surface A adapted to supporting said gripping means 16 for the workpieces P.
  • the reference surface A preferably comprises a curved surface having at least one line of reference 1 for the workpiece P; preferably said reference surface A is a convex surface on the part facing towards the workpiece P to be held. Said curved surface is for example a part of the side surface of a cylinder wherein the generatrices are all substantially parallel to one another.
  • Each of said generatrices constitutes a line of reference 1 for the workpiece P, that is it may constitute a theoretical line of contact between the side surface of the workpiece P and the reference surface A.
  • Said at least one line of reference 1 for the workpiece P forms an, advantageously acute, angle ⁇ with the base 22, that is, less than 90 sexagesimal degrees.
  • said angle ⁇ is comprised of between 10 and 60 sexagesimal degrees, preferably, it is equal to 35 sexagesimal degrees.
  • said gripping means 16 comprise a pair of jaws 34, 36 adapted to locking the workpiece P to be machined.
  • said pair of jaws 34,36 comprises at least one movable jaw 34, i.e. sliding substantially parallel to said reference surface A.
  • said moveable jaw 34 is moveable according to a direction, incident with said reference surface A.
  • the moveable jaw 34 is moveable according to a direction substantially perpendicular to said reference surface A.
  • said moveable jaw 34 comprises a housing 40 adapted to, at least partially, house a moveable body 46.
  • said housing 40 is fixed to the body 10 of the workholding fixture device 4 through slotted holes 47 and relevant threaded means of connection, in such a manner as to be able to vary its position of fixing along the reference surface A.
  • Said moveable body 46 comprises for example a stem 48 operated by relevant means of actuation, not represented, such as for example pneumatic, hydraulic, electric motor, recirculating ball screw mechanism actuations and the like.
  • Said stem 48 is movable according to a translation motion substantially parallel to the reference surface A.
  • the stem 48 translates along a direction of advancement L which forms an angle of advancement ⁇ with said line of reference 1 of the reference surface A.
  • said angle of advancement ⁇ is advantageously comprised of between 0 and 5 sexagesimal degrees, preferably it is equal to 0.5 sexagesimal degrees .
  • the stem 48 at one end which faces towards the workpiece P for gripping, has a first striking surface Q adapted to pulling up against the workpiece P.
  • said first striking surface Q is a canopy surface.
  • the jaw 36 opposite the moveable jaw 34 along the reference surface A, is preferably fixed with respect to the reference surface A and is positioned at one end of the reference surface A facing towards the part opposite said base 22.
  • the jaw 36 comprises a second striking surface R substantially perpendicular to the reference surface A.
  • the second striking surface R has a curved surface, convex on the part facing towards the workpiece P to be held, for example a portion of a side surface of a cylinder in which the striking generatrices or lines M are all substantially parallel to one another and preferably perpendicular to the line of reference 1 constituting the reference surface A.
  • the second striking surface R, on the side of the opposite moveable jaw 34 forms with a perpendicular to the reference surface A, a locking angle p comprised of between 0 and 10 sexagesimal degrees, preferably equal to 1 sexagesimal degree.
  • Said locking angle p is obtained for example through the machining, following the assembly of the jaw 36 substantially perpendicularly to the reference surface A.
  • the jaw 36 is connected to the reference surface A in such a manner as to specify a common reference edge 64 therewith.
  • said reference edge 64 is constituted by the intersection between the generatrices or lines of reference 1 of the cylindrical surface of the plane of locking A and the generatrices or striking lines of the second striking surface R.
  • Said reference edge 64 may be curvilinear, i.e. comprising an arch, and is constituted by the locus of the reference points usable by a control system of a machine tool for the resetting of the position of the workpiece P.
  • said body 10 comprises reference means 65 adapted to forming an axial reference for the workpiece P, preferably according to a direction parallel to the prevailing extension E.
  • said reference means 65 may comprise a rod 66 rotating around an axis of rotation substantially parallel to said direction of prevailing extension E; said rod, rotating for example from a resting position of the rod 66, wherein for example it is arranged parallelly to said base 22, in such a manner as to not interfere with one of the ends P' , P' ' of the workpiece P, to a working position of the rod 66, wherein said bar 66 is rotated in such a manner as to move up against one of said ends P' , P' ' of the workpiece P.
  • the point or area of contact between said rod 66 and said end P' or P' ' of the workpiece P advantageously constitutes a reference for the positioning of the workpiece P on the workholding fixture device 4 along a direction which is substantially parallel to said prevailing extension E.
  • the gripping means 16 define a gripping point 68 adapted to holding at least one part of the workpiece P to be locked.
  • the workholding fixture device 4 comprises at least two bodies 10 placed side by side to one another along the prevailing dimension C of the bodies themselves .
  • Said bodies 10 preferably placed side by side along a common prevailing direction C, forming a multiple workholding fixture device having a single crossbeam 70 from which several reference surfaces A originate, preferably parallel to one another, or having corresponding reference angles ⁇ differing from one another.
  • the gripping means 16 define a plurality of gripping points 68 for similar workpieces P being locked and machined.
  • said bodies 10 are arranged side by side along different prevailing directions C parallel with one another. In other words, said bodies are parallel with one another but staggered for example by a distance equal to the thickness G of the bodies themselves.
  • the reference surfaces A are arranged side by side, and parallel to one another; in other words the reference surfaces comprise at least one line of reference 1 which has the same distance from said base 22.
  • the gripping means 16 work according to a direction parallel to the line of reference of the reference surfaces, in such a manner that generally, the reference surfaces and the gripping means are arranged in parallel, side by side and at least partially overlapping one another.
  • the reference surfaces A and the gripping means 16 are inclined in such a manner that at least one of the gripping means 16 of one body 10 of one workholding fixture device 4, for example a fixed jaw 36, overlaps the gripping seat 68 of the adjacent body 10 with respect to a direction perpendicular to said reference surface A.
  • two workholding fixture devices 4 are arranged side by side and aligned with one another with respect to a direction perpendicular to the corresponding prevailing direction C, in such a manner as to form a bracket unit 76.
  • the workpiece P On the bracket unit 76 the workpiece P may be mounted protruding between the two workholding fixture devices 4, for example with the opposing ends P' , P' ' , housed within the corresponding gripping seats 68 of the workholding fixture devices themselves; said ends P' , P' ' being opposing with respect to said prevailing extension E.
  • the clamping unit 76 comprises multiple workholding fixture devices 4, each comprising a plurality of gripping seats 68 for similar workpieces P to be gripped.
  • a plurality of workpieces P, parallel to one another may be mounted.
  • bracket unit comprising multiple workholding fixture devices a plurality of workpieces P may be mounted in such a manner that all the workpieces have the same distance from the base 22.
  • the workholding fixture device 4 is mounted on supporting means 28 which are preferably drivable.
  • the workholding fixture device is drivable along the axes of translation and/or rotation X, Y, Z in such a manner as to be able to adapt the clamping unit 76 to workpieces of different dimensions.
  • said supporting means 28 are drivable along said axes of translation and/or rotation X, Y, Z through pneumatic, hydraulic, electrical, manual types of actuation and the like.
  • the driving of the supporting means 28 around the axes of rotation X, Y, Z may come about using tables rotating or tilting within the respective reference planes.
  • the supporting means 28 rest on a workpiece table 90 adapted to moving in a plane parallel with said base 22 and with said plane of support S of the machine tool 6.
  • Said workpiece table 90 is preferably adapted to rotating around an axis parallel with said axis Z or to rotate or tilt with respect to the axis parallel to the axes X, Y in order to allow the orientation of the workholding fixture device and/or the clamping unit 76 on planes suitable for facilitating the machining of the workpiece P .
  • the workholding fixture device 4, the clamping unit 76 and the workpiece table 90 are adapted to being mounted on said machine tool 6 for the working of elongated workpieces P.
  • said machine tool 6 comprises a frame 94 having for example two struts 96, extending in a direction parallel to the axis Z, and a central crossbeam 98 extending in a direction parallel to said plane X, Y.
  • the frame 94 defines a workspace 102 adapted to receiving the workpiece to be machined.
  • a tool holder unit 106 adapted to running along said central crossbeam 98 and parallelly therewith on appropriate guides 110.
  • Said tool holder unit 106 comprises a plurality of toolholding heads 114 for the machining of the workpiece P.
  • the toolholding heads 114 provide at least three axes of translation X, Y, Z which define three axes of positioning and/or working perpendicular to one another.
  • each of said axes is controlled in nature; as well as operatively connected to an actuation and control unit.
  • the controlled actuation is of the retroactivated control type.
  • the toolholding heads 114 are mounted on the toolholding head unit 106 in such a manner as to rotate around an axis of rotation for example parallel to said axis Z, in such a manner as to define a fourth controlled axis of positioning and/or working IV operatively connected to an actuation and control unit .
  • the toolholding heads 114 are mounted on the toolholding head group 106 in such a manner as to be able to rotate around an axis of rotation for example parallel to said axis Y, in such a manner as to define a fifth controlled axis of positioning and/or working V operatively connected to an actuation and control unit.
  • a bed 118 Substantially below said frame 94, is positioned a bed 118, arranged for example perpendicularly to said central crossbeam 98 and adapted to movably supporting at least one workpiece table 90, allowing said at least one workpiece table 90 to translate for example in a direction perpendicular to said central crossbeam 98.
  • the operation of the workholding fixture device according to the invention will now be described.
  • At least one workpiece P is previously positioned on a bracket unit 76 for example oriented in such a manner as to have its prevailing extension E substantially perpendicular to the prevailing dimensions C of the bodies 10 of the workholding fixture devices 4.
  • the opposite ends of the workpiece P with respect to its prevailing extension E are positioned in correspondence with the gripping seats 68 of the workholding fixture devices, facing towards one another according to a direction perpendicular to the prevailing dimension C of the corresponding workholding fixture devices 4.
  • the workpiece P is positioned in close proximity to the gripping seats 68, in such a manner as to make at least one part of its side surface rest against at least one of the second striking surfaces R of the jaw 36 and the reference surface A of the body.
  • the two workholding fixture devices may move with respect to the axes of translation and/or rotation X, Y and Z in such a manner for example so as to select the preferred distance between the locking surfaces A of the workholding fixture devices 4.
  • the moveable jaws 34 are actuated in such a manner as to grasp each end P' , P' ' of the workpiece P between the pairs of jaws 34, 36.
  • the side surface of the workpiece P is placed in contact with at least one line of reference 1 of the reference surface A and/or with at least one striking line M of the second striking surface R.
  • the workpiece and the toolholding heads 114 are brought side by side, for example by making the workpiece table 90 on which the bracket unit is mounted 76 translate towards the central crossbeam 98 of the frame 94.
  • the toolholding heads 114 take the reference edge 64 , formed by the intersection of the striking line M with the line of reference 1 as a resetting point.
  • the reference edges may be parallel to one another in such a manner as to allow the precise and repeatable resetting operation of the toolholding head in the changeover from the machining of one workpiece to another.
  • the machining operations may occur over the entire prevailing extension E of the workpiece P, comprising said ends P' and P' ' .
  • the described workholding fixture device allows the overcoming of the drawbacks shown by the workholding fixture devices of the known art.
  • the angled layout of the workpiece on the relevant workholding fixture devices allows having the maximum number of workable workpieces with parity of length to that of the workpiece table and of the course of the axes of the machine.
  • the angled layout of the workpiece on the workholding fixture devices allows for the working of the workpiece over its entire prevailing extension including the opposite ends, hence performing a single positioning and gripping of the workpiece on the workholding fixture device.
  • the described workholding fixture device allows the working of all the faces of the side surfaces of the workpiece along the extension E, thanks to the angled layout of the workpiece P, preferably with the aid of a machine tool having for example three working axes.
  • the workholding fixture device allows performing simultaneous machinings on several workpieces without having the problems of interference between the toolholding heads and the positioned workpieces.
  • the workpiece With a single positioning of the workpiece, it is possible to have access to all the faces of the side surface of the workpiece, thus achieving more rapid and more precise machining. Indeed such workings do not require the disassembly of the workpiece, its new positioning, the subsequent reassembly and the resetting of the position of the toolholding head.
  • An additional advantage lies in the fact that the grouped layout of the workpieces on the workholding fixture device allows, following machining with the tool, of having finished or semi-finished products that are easily releasable from the machine using automated, for example by rack, or manually driven systems.
  • One skilled in the art with the aim of satisfying contingent and specific needs, may bring about a number of modifications and variations to the above described workholding fixture devices, which are all contemplated within the scope of the invention as defined by the following claims .

Abstract

L'invention concerne un dispositif (4) de serrage de pièces conçu pour supporter des pièces (P) de forme allongée, présentant une étendue (E) à dominante longitudinale entourée par au moins une surface latérale. Le dispositif (4) de serrage peut être combiné avec des machines-outils (6) équipées d'au moins une tête (114) porte-outil permettant l'usinage des pièces (P). Ce dispositif (4) comprend un corps (10) conçu pour supporter des moyens (16) de préhension qui maintiennent la pièce. Ce corps (10) comporte un base (22) conçue pour interagir avec des moyens (28) de support du dispositif (4) de serrage de pièces, et comprenant une surface (a) de référence laquelle présente au moins une ligne de référence (1) pour la pièce (P), cette ligne de référence (1) formant un angle (α) avec la base, de telle manière que dans une configuration de préhension de la pièce (P) par les moyens (16) de préhension, une partie au moins de la surface latérale de la pièce (P) est accessible à la tête porte-outil (114) sur toute l'étendue principale (E) de la pièce, et aux extrémités P', P''.
EP03775807A 2003-10-31 2003-10-31 Dispositif de support Withdrawn EP1680261A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2003/000705 WO2005042207A1 (fr) 2003-10-31 2003-10-31 Dispositif de support

Publications (1)

Publication Number Publication Date
EP1680261A1 true EP1680261A1 (fr) 2006-07-19

Family

ID=34531875

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03775807A Withdrawn EP1680261A1 (fr) 2003-10-31 2003-10-31 Dispositif de support

Country Status (3)

Country Link
EP (1) EP1680261A1 (fr)
AU (1) AU2003283826A1 (fr)
WO (1) WO2005042207A1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3826484A (en) * 1972-12-07 1974-07-30 Raycon Corp Workpiece positioning and holding apparatus
DE69107196T2 (de) * 1991-04-05 1995-05-24 Torres Martinez M Werkzeugmaschineneinrichtung zum Einspannen und Bearbeiten.
DE19521831A1 (de) * 1995-06-16 1996-12-19 Johann Metzinger Spannvorrichtung zum Einspannen von Werkstücken
IT1313224B1 (it) * 1999-07-02 2002-06-17 Unifor Spa Dispositivo di serraggio e di posizionamento di pezzi in lavorazionedi forma allungata e sottile.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005042207A1 *

Also Published As

Publication number Publication date
WO2005042207A1 (fr) 2005-05-12
AU2003283826A1 (en) 2005-05-19

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