FR2484881A1 - Screw-driven lift rail for milling head - uses counter-weighted pulley sheave to suspend beam from which head is suspended - Google Patents

Screw-driven lift rail for milling head - uses counter-weighted pulley sheave to suspend beam from which head is suspended Download PDF

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Publication number
FR2484881A1
FR2484881A1 FR8010076A FR8010076A FR2484881A1 FR 2484881 A1 FR2484881 A1 FR 2484881A1 FR 8010076 A FR8010076 A FR 8010076A FR 8010076 A FR8010076 A FR 8010076A FR 2484881 A1 FR2484881 A1 FR 2484881A1
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Prior art keywords
cross member
auxiliary
counterweight
head
crossmember
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Pending
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FR8010076A
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French (fr)
Inventor
Henri B Line
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LINE SA
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LINE SA
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Priority to FR8010076A priority Critical patent/FR2484881A1/en
Publication of FR2484881A1 publication Critical patent/FR2484881A1/en
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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
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/001—Arrangements compensating weight or flexion on parts of the machine
    • B23Q11/0014—Arrangements compensating weight or flexion on parts of the machine using static reinforcing elements, e.g. pre-stressed ties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C1/00—Milling machines not designed for particular work or special operations
    • B23C1/002—Gantry-type milling machines
    • 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
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/001—Arrangements compensating weight or flexion on parts of the machine
    • B23Q11/0017—Arrangements compensating weight or flexion on parts of the machine compensating the weight of vertically moving elements, e.g. by balancing liftable machine parts

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

Abstract

The weight-compensator is used on a milling machine with machining heads (15, 15a) traversing an horizontal elevator beam (5). The beam (5) is mounted on a portal frame (3, 10, 3a), its vertical movement guided by a column (3, 3a) with integral tracks (6), and its drive provided by motorised screws (7) enmeshing with the beam (5) via integral nuts (8). Each head (15) is suspended from a second overhead beam (17) which is in turn suspended by a counterweighted (22) cable (21, 21a) and pulley (23, 24) system obviating unequal beam (5) reactions on the screws (7). The (15) suspension may use cantilever arms (18) to locate rollers (19) on tracks (20), and the weight of the counterweight (22) may equal that of the heads (15) and the second beam (17).

Description

Dispositif d'équilibrage d'au moins une tette d'usinage se déplaçant sur une traverse mobile de fraiseuse. Balancing device for at least one machining tab moving on a movable crossmember of a milling machine.

La présente invention se rapporte à un dispositif d'équilibrage d'au moins une tete d'usinage se déplaçant sur une traverse mobile de fraiseuse. The present invention relates to a balancing device for at least one machining head moving on a movable crossmember of a milling machine.

On connaît des fraiseuses dont le portique est constitué de deux montants reliés par une traverse fixe. Sur ces montants coulisse verticalement une traverse mobile guidée par des glissibres portées par les montants et déplacée par deux vis entra indes par un organe moteur. Sur la traverse mobile peuvent coulisser horizontaler ment une ou plusieurs tetes de fraisage. Milling machines are known, the gantry of which consists of two uprights connected by a fixed cross-member. On these uprights slides vertically a movable cross member guided by sliding carried by the uprights and moved by two screws entered by a motor member. One or more milling heads can slide horizontally on the movable cross member.

Toutefois lors du déplacement des têtes d'usinage on peut constater que les vis ne sont pas soumises aux mimes efforts et qu'il se produit des réactions sur la traverse mobile qui supporte tout le poids des tettes de fraisage. However, when the machining heads are moved, it can be seen that the screws are not subjected to the same forces and that reactions occur on the movable cross member which supports the entire weight of the milling tettes.

La présente invention a pour objet de remédier à ces in convénients
Conformément à la présente invention, une traverse auxiliaire est disposée au-dessus de la traverse mobile principale et supporte au moins une tette d'usinage qui comporte un moyen de sus pension en appui sur la traverse auxiliaire et susceptible de se déplacer par-rapport a cette dernière, ladite traverse auxiliaire étant reliée à ses deux extrémités par un moyen de suspension à un contre-poids.The object of the present invention is to remedy these disadvantages
In accordance with the present invention, an auxiliary crossmember is disposed above the main movable crossmember and supports at least one machining tette which comprises a suspension means bearing on the auxiliary crossmember and capable of moving relative to a the latter, said auxiliary cross member being connected at its two ends by a suspension means to a counterweight.

Cette disposition permet d'obtenir deux résultats - conserver des efforts égaux sur les vis entrainant la traverse principale, pour que celles-ci qui présentent la meme section, soient soumises à des efforts égaux, s'allongent de quantités égales et maintiennent la traverse mobile principale dans une position toujours parallèle à la position d'origine quelle que soit la position des te tes de fraisage sur cette traverse; - diminuer le plus possible les réactions sur la traverse mobile principale dues aux poids des tetes de fraisage de telle sorte que la rectitude des glissières de cette traverse ne soit pas affectée par la position ou le déplacement des tetes de fraisage.  This arrangement makes it possible to obtain two results - to maintain equal forces on the screws driving the main cross-member, so that those which have the same section, are subjected to equal forces, lengthen by equal amounts and keep the mobile cross-member main in a position always parallel to the original position whatever the position of the milling heads on this crosspiece; - Reduce as much as possible the reactions on the main movable cross member due to the weights of the milling heads so that the straightness of the slides of this cross member is not affected by the position or movement of the milling heads.

Il en résulte que les têtes de fraisage sont supportées par la traverse auxiliaire et ne pèsent plus sur la traverse mobile principale ce qui permet d'obtenir le résultat mentionné ci-dessus. As a result, the milling heads are supported by the auxiliary crossmember and no longer weigh on the main mobile crossmember, which makes it possible to obtain the above-mentioned result.

par ailleurs, les vis ne supportent donc plus que le poids de la traverse mobile principale. Il suffit de les disposer symétriquement par rapport au centre de gravité de la traverse mobile principale pour obtenir des efforts égaux sur les vis. moreover, the screws therefore only support the weight of the main movable cross member. It suffices to arrange them symmetrically with respect to the center of gravity of the main movable cross member to obtain equal forces on the screws.

Il est possible d'adjoindre un dispositif d'équilibrage supplémentaire classique par contre-poids ou par vérin destiné à annuler les efforts constants auxquels sont soumises les vis mais cela n'est pas indispensable pour atteindre les buts visés pour la présente invention. It is possible to add a conventional additional balancing device by counterweight or by cylinder intended to cancel the constant forces to which the screws are subjected, but this is not essential to achieve the aims of the present invention.

D'autres caractéristiques et avantages de l'invention seront mieux compris à la lecture de la description qui va suivre d'un exemple de réalisation et en se référant aux dessins annexés, sur lesquels
la figure I est une vue en élévation de face d'une fraiseuse équipée du dispositif d'équilibrage suivant l'invention
la figure 2 est une vue en élévation latérale de la fraiseuse et du dispositif d'équilibrage
la figure 3 est une vue en plan du dispositif d'équilibrage ; et
la figure 4 est une vue des éléments du dispositif d'équilibrage ramenés dans un même plan.Other characteristics and advantages of the invention will be better understood on reading the following description of an exemplary embodiment and with reference to the accompanying drawings, in which
Figure I is a front elevational view of a milling machine equipped with the balancing device according to the invention
Figure 2 is a side elevational view of the milling machine and the balancing device
Figure 3 is a plan view of the balancing device; and
Figure 4 is a view of the elements of the balancing device brought in the same plane.

Aux figures 1 et 2 on a représenté une fraiseuse à portique qui comprend un bati 1 sur lequel sont montés une table d'usinage 2 et deux montants 3, 3a reliés par une traverse fixe 4. FIGS. 1 and 2 show a portal milling machine which comprises a frame 1 on which are mounted a machining table 2 and two uprights 3, 3a connected by a fixed cross-member 4.

Sur les montants 3, 3a est montée coulissante verticalement une traverse mobile principale 5 guidée par des glissières 6 et déplacée au moyen de deux vis 7, 7a qui engrènent avec des écrous 8, 8a solidaires de la traverse 5, lesdites vis étant guidées à leur partie supérieure dans des paliers 9, 9a fixés sur les montants 3, 3a et a leur partie supérieure dans un carter 10 fixé sur les montants 3, 3a. A leur partie supérieure les vis 7, 7a sont reliées par un couple de pignons d'angle 11, lla à un arbre 12 relié par un couple de pignons 13 à un moteur 14 qui entraine simultanément les deux vis 7, 7a et par suite la traverse 5.  On the uprights 3, 3a is vertically slidingly mounted a main movable cross member 5 guided by slides 6 and moved by means of two screws 7, 7a which mesh with nuts 8, 8a integral with the cross member 5, said screws being guided at their upper part in bearings 9, 9a fixed on the uprights 3, 3a and at their upper part in a casing 10 fixed on the uprights 3, 3a. At their upper part, the screws 7, 7a are connected by a pair of angle pinions 11, 11a to a shaft 12 connected by a pair of pinions 13 to a motor 14 which simultaneously drives the two screws 7, 7a and consequently the cross 5.

Sur la traverse mobile principale 5 sont montées coulissant horizontalement des tetes de fraisage 15, 15a qui présentent a leur partie inférieure des broches porte-outil 16, lúa.  On the main movable crossmember 5 are mounted horizontally sliding milling heads 15, 15a which have at their lower part tool-holder spindles 16, lúa.

Conformément à l'invention, une traverse auxiliaire 17 est disposée au-dessus de la traverse mobile principale 5. Cette traverse auxiliaire 17 est guidée de façon a demeurer appliquée sur les glissières 6 des montants 3, 3a, toutefois ladite traverse peut s'incliner par rapport à la traverse mobile 5. According to the invention, an auxiliary cross member 17 is disposed above the main movable cross member 5. This auxiliary cross member 17 is guided so as to remain applied to the slides 6 of the uprights 3, 3a, however said cross member can tilt relative to the movable cross member 5.

A leur partie supérieure, les têtes d'usinage 15, 15a sont munies d'un organe de suspension constitué d'une barre 18, 18a comc portant à sa partie supérieure un galet rotatif 19, 19e se déplaçant sur un chemin de roulement 20 prévu sur la face supérieure de la traverse auxiliaire 17. At their upper part, the machining heads 15, 15a are provided with a suspension member consisting of a bar 18, 18a comc carrying at its upper part a rotary roller 19, 19th moving on a raceway 20 provided on the upper face of the auxiliary cross member 17.

De ce fait, les têtes d'usinage 15, 15a sont supportées par la traverse auxiliaire 17 qui est elle-même suspendue par deux câbles 21, 21a reliés à un même contre-poids 22 (figures 1, 2 et 3) dont la masse P est égale à la somme de la masse des têtes de fraisage 15, 15a et de la traverse auxiliaire 17. Therefore, the machining heads 15, 15a are supported by the auxiliary cross member 17 which is itself suspended by two cables 21, 21a connected to the same counterweight 22 (Figures 1, 2 and 3) whose mass P is equal to the sum of the mass of the milling heads 15, 15a and the auxiliary cross member 17.

Les cibles 21, 21a sont guidés à la partie supérieure des montants 3, 3a par des poulies 23, 23a et par des poulies 24, 24e dans un plan vertical, l'un des câbles 21 étant guidé dans un plan horizontal par des poulies de renvoi 25, 26 assurant son déplacement transversal de telle sorte que les deux cables 21, 21a se trouvent sensiblement dans un même plan vertical au-dessus du contre-poids 22 sur lequel ils sont fixés. The targets 21, 21a are guided at the top of the uprights 3, 3a by pulleys 23, 23a and by pulleys 24, 24e in a vertical plane, one of the cables 21 being guided in a horizontal plane by pulleys of return 25, 26 ensuring its transverse movement so that the two cables 21, 21a are located substantially in the same vertical plane above the counterweight 22 on which they are fixed.

Cet ensemble est schématisé à la figure 4 où les éléments sont ramenés dans un même plan. Le système est soumis au poids de la traverse auxiliaire qui est représenté par une force P3, aux poids des têtes de fraisage 15, 15a représentées par les forces F1 et F2 et au poids du contre-poids 22 représenté par la force P. This assembly is shown diagrammatically in FIG. 4 where the elements are brought together in the same plane. The system is subjected to the weight of the auxiliary cross member which is represented by a force P3, to the weights of the milling heads 15, 15a represented by the forces F1 and F2 and to the weight of the counterweight 22 represented by the force P.

On Deut en déduire - Traction sur le cible - Traction sur le cable

Figure img00030001

- Le poids du contre-poids P = F1 + F2 + F3
La traverse auxiliaire 17 demeure en équilibre quelle que soit la position des têtes de fraisage 15, 15a. Les cibles de suspension 21, 21s sont soumis à des efforts qui dépendent, de la position des têtes de fraisage, ce qui se traduit par des allongements différents provoquant une légère inclinaison de la traverse auxiliaire d'où la disposition mentionnée ci-dessus pour son guidage.We should deduce - Traction on the target - Traction on the cable
Figure img00030001

- The weight of the counterweight P = F1 + F2 + F3
The auxiliary cross member 17 remains in equilibrium whatever the position of the milling heads 15, 15a. The suspension targets 21, 21s are subjected to forces which depend on the position of the milling heads, which results in different elongations causing a slight inclination of the auxiliary cross-member, hence the arrangement mentioned above for its guidance.

Il en résulte que les têtes de fraisage 15, 15a sont supportées par la traverse auxiliaire 17 et ne pèsent pas sur la traverse mobile 5. As a result, the milling heads 15, 15a are supported by the auxiliary cross member 17 and do not weigh on the movable cross member 5.

Les vis 7, 7a ne supportent donc plus que le poids de la traverse mobile 17. Il suffit de les disposer symétriquement par rapport au centre de gravité de la traverse mobile 5 pour obtenir des efforts égaux sur les vis. Il est possible d'adjoindre un dispositif d'équilibrage supplémentaire classique par contre-poids ou vérin destiné à annuler les efforts constants auxquels sont soumises les vis 7, 7a mais cela n'est pas indispensable pour obtenir des efforts égaux sur les vis et diminuer les réactions sur la traverse mobile 17. The screws 7, 7a therefore only support the weight of the movable cross member 17. It suffices to arrange them symmetrically with respect to the center of gravity of the movable cross member 5 to obtain equal forces on the screws. It is possible to add a conventional additional balancing device by counterweight or jack intended to cancel the constant forces to which the screws 7, 7a are subjected, but this is not essential for obtaining equal forces on the screws and reducing reactions on the moving cross member 17.

Bien entendu diverses modifications peuvent être apportées par l'homme de l'art aux dispositifs ou procédés qui viennent d'être décrits uniquement à titre d'exemples non limitatifs sans sortir du cadre de l'invention. Of course, various modifications can be made by those skilled in the art to the devices or methods which have just been described only by way of nonlimiting examples without departing from the scope of the invention.

Claims (4)

REVENDICATIONS 1. Dispositif d'équilibrage d'au moins une tête d'usinage se déplaçant horizontalement sur une traverse montée coulissante verticalement sur des glissières solidaires des deux montants d'un portique de fraiseuse, ladite traverse étant déplacée au moyen de deux vis portées par les montants et entraînées par un organe moteur, caractérisé en ce qu'une traverse auxiliaire est disposée au-dessus de la traverse mobile principale et supporte au moins une tête d'usi- nage qui comporte un moyen de suspension en appui sur la traverse auxiliaire et susceptible de se déplacer par rapport à cette dernière, ladite traverse auxiliaire étant reliée à ses deux extrémités par un moyen de suspension à un contre-poids.1. Balancing device of at least one machining head moving horizontally on a cross member sliding vertically mounted on slides integral with the two uprights of a milling machine gantry, said cross member being moved by means of two screws carried by the uprights and driven by a drive member, characterized in that an auxiliary crossmember is disposed above the main mobile crossmember and supports at least one machining head which comprises a suspension means bearing on the auxiliary crossmember and likely to move relative to the latter, said auxiliary cross member being connected at its two ends by a suspension means to a counterweight. 2. Dispositif suivant la revendication 1, caractérisé en ce que le moyen de suspension de la tête d'usinage sur la traverse auxiliaire est constitué d'une barre s'étendant verticalement qui est solidaire de la partie supérieure de la tête d'usinage et qui est munie à son extrémité libre d'un galet se déplaçant sur un chemin de roulement prévu sur la face supérieure de la traverse auxiliaire.2. Device according to claim 1, characterized in that the means for suspending the machining head on the auxiliary cross member consists of a bar extending vertically which is integral with the upper part of the machining head and which is provided at its free end with a roller moving on a raceway provided on the upper face of the auxiliary crossmember. 3. Dispositif suivant la revendication 1, caractérisé en ce que le moyen de suspension de la traverse auxiliaire au contre-poids est constitué de deux cables ou chaines fixés aux deux extrémités de ladite traverse et guidés à la partie supérieure du portique par des poulies, l'un des cibles ou channes étant guidé dans un plan horizontal par des poulies de renvoi assurant son déplacement transversal de telle sorte que les deux cibles ou channes se trouvent. sen- siblement dans un même plan vertical au-dessus du contre-poids. 3. Device according to claim 1, characterized in that the means for suspending the auxiliary cross member from the counterweight consists of two cables or chains fixed at the two ends of said cross member and guided at the upper part of the gantry by pulleys, one of the targets or chains being guided in a horizontal plane by deflection pulleys ensuring its transverse movement so that the two targets or chains are located. substantially in the same vertical plane above the counterweight. 4. Dispositif suivant la revendication 1, caractérisé en ce que la masse du contre-poidsestégaleà la somme de la masse diau moins une tête de fraisage et de la traverse auxiliaire. 4. Device according to claim 1, characterized in that the mass of the counterweight is equal to the sum of the mass diau at least one milling head and the auxiliary crosspiece.
FR8010076A 1980-05-06 1980-05-06 Screw-driven lift rail for milling head - uses counter-weighted pulley sheave to suspend beam from which head is suspended Pending FR2484881A1 (en)

Priority Applications (1)

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FR8010076A FR2484881A1 (en) 1980-05-06 1980-05-06 Screw-driven lift rail for milling head - uses counter-weighted pulley sheave to suspend beam from which head is suspended

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8010076A FR2484881A1 (en) 1980-05-06 1980-05-06 Screw-driven lift rail for milling head - uses counter-weighted pulley sheave to suspend beam from which head is suspended

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110131791A1 (en) * 2008-07-30 2011-06-09 Anger Machining Gmbh Machine tool

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110131791A1 (en) * 2008-07-30 2011-06-09 Anger Machining Gmbh Machine tool
US8821083B2 (en) * 2008-07-30 2014-09-02 Anger Machining Gmbh Machine tool including a plurality of tool spindles and a frame shaped rack

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