BE502100A

BE502100A -

Info

Publication number: BE502100A
Authority: BE
Priority date: 1951-03-23
Also published as: DE863607C; CH290966A

Description

       

  DISPOSITIF AUTOMATIQUE POUR LA REALISATION DE CYCLES DE FABRICATION

CONTINUS. 

  
On a déjà proposé d&#65533;équiper les machines-outils à cycles de fabrication continus et automatiques de dispositifs destinés assurer le

  
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laps de temps assez court une usure très préjudiciable à la précision de positionnement des organes. De plus.!) le large dimensionnement des organes de commande., eu égard au poids souvent important des chariots à manoeuvrer.!) 

  
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de cycles à cadence accéléréeo

  
Les dispositifs à commande hydraulique présentent sous un pe= tit volume toutes les qualités requises en cette matière s puissance, rapi= dité de déplacement., absence presque absolue d'inertie aux renversements

  
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est parfois nécessaire de travailler en butéeo

  
La présente invention a pour objet Inapplication nouvelle à

  
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hydraulique de type connu utilisé actuellement uniquement comme dispositif reproducteur de précision sur tours et fraiseuses.

  
Elle a pour objet un dispositif caractérisé en ce que des dé-

  
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en fonction du profil de la pièce à reproduire, le palpeur de ce dispositif connu coopérant avec ladite came tournante. 

  
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daptation de ce dispositif pour la commande des déplacements d'un chariot

  
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porte-meules avance lente du travail en plongée sur la pièces arrêt temporisé et précis à la cote demandée, retour rapides etc... réalisant ainsi un cycle de travail complet sans interruption. 

  
Selon un premier mode de réalisation du dispositif selon l'in-

  
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et son piston de commande sont solidaires du chariot mobile de la machine et sont par suite reliés au bâti de celle-ci par un conduit souple. 

  
Selon un autre mode de réalisation, la came est solidaire du chariot mobile et le palpeur du bâti de manière que toutes les liaisons sans exception, puissent s'effectuer par conduits forés dans les blocs ou les bâtis de la machine.

  
Selon une première variante., la came est plate et agit par son profil contre lequel appuie le palpeur. ' 

  
Selon une seconde variante,\) la came est constituée par un tambour cylindrique et le profil commandant les déplacements du palpeur est constitué par une rainure.hélicoïdale ménagée sur ce tambour.

  
Sur le dessin annexé qui représente à titre d'exemple divers modes de réalisation de l'invention s

  
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d'une machine à rectifier sur laquelle on a indiqué en coupe le détail d'un dispositif hydraulique de commande selon l'invention^.

  
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La figo 2 est une vue en plan des mêmes chariots montrant notamment la dispositif de la came de commande du cycle et son mécanisme,9

  
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est une came à tambour. 

  
Sur le bâti 1 de la machine représentée sur les figso 1 et 2 coulissent deux chariots superposés 2 et 3 portant l'arbre porte-meule 4

  
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Le premier chariot 2 est attelé directement au mécanisme de commande hydraulique qui va être décrit. Le second chariot 3 peut se déplacer sur le premier à 1-'aide d'un volant 10 et d'un mécanisme à renvoi par pignon et crémaillère 11 pour les manoeuvres de réglage et le rattrapage d'usure de la meule. 

  
Le dispositif de commande hydraulique de type connu comporte

  
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Une pompe à engrenage 16 puise de l'huile dans le réservoir 17 et alimente constamment en huile l'espace annulaire 18 du cylindre 15 en

  
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La pression de l'huile qui s'écoule au travers de la soupape 19 dans le



  AUTOMATIC DEVICE FOR THE PERFORMANCE OF MANUFACTURING CYCLES

CONTINUOUS.

  
It has already been proposed to equip machine tools with continuous and automatic production cycles with devices intended to ensure the

  
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A fairly short period of time, wear which is very detrimental to the positioning precision of the components. In addition.!) The large dimensioning of the control units, given the often heavy weight of the trolleys to be maneuvered.!)

  
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of cycles at an accelerated rate

  
The hydraulically controlled devices present in a small volume all the qualities required in this matter s power, speed of movement, almost absolute absence of inertia to overturning

  
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is sometimes necessary to work in abutment

  
The present invention relates to a novel application to

  
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hydraulic system of known type currently used only as a precision reproducing device on lathes and milling machines.

  
It relates to a device characterized in that de-

  
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depending on the profile of the part to be reproduced, the feeler of this known device cooperating with said rotating cam.

  
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adaptation of this device for controlling the movements of a trolley

  
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grinding wheel holder slow advance of the work plunged on the part timed and precise stop at the requested dimension, rapid return etc. thus achieving a complete working cycle without interruption.

  
According to a first embodiment of the device according to the in-

  
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and its control piston are integral with the movable carriage of the machine and are consequently connected to the frame thereof by a flexible duct.

  
According to another embodiment, the cam is integral with the movable carriage and the feeler of the frame so that all the connections, without exception, can be effected by ducts drilled in the blocks or the frames of the machine.

  
According to a first variant, the cam is flat and acts by its profile against which the probe presses. '

  
According to a second variant, \) the cam is formed by a cylindrical drum and the profile controlling the movements of the feeler is constituted by a helical groove formed on this drum.

  
In the accompanying drawing which shows by way of example various embodiments of the invention s

  
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of a grinding machine on which the detail of a hydraulic control device according to the invention has been shown in section.

  
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Figo 2 is a plan view of the same carriages showing in particular the device of the cycle control cam and its mechanism, 9

  
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is a drum cam.

  
On the frame 1 of the machine shown in figs 1 and 2 slide two superimposed carriages 2 and 3 carrying the grinding wheel shaft 4

  
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The first carriage 2 is coupled directly to the hydraulic control mechanism which will be described. The second carriage 3 can move on the first one using a flywheel 10 and a pinion and rack 11 return mechanism for the adjustment maneuvers and the wear compensation of the grinding wheel.

  
The hydraulic control device of known type comprises

  
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A gear pump 16 draws oil from the reservoir 17 and constantly supplies oil to the annular space 18 of the cylinder 15 in

  
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The pressure of the oil flowing through the valve 19 in the

Claims

cylinder 15 is regulated by the edge 21 of the valve 13 controlling the duct 22 drilled inside the piston rod, this oil returning to the re- <EMI ID = 15.1>

Directly supply the oil to the reservoir when the piston 12 is at full stroke o

According to the invention, the feeler 13 is constantly maintained by its spring 14 against a cam 24 driven in rotation by a motor 25 and its reduction gear 26 fixed on the frame 1 of the machine by a console 27.

print on carriage 2 according to the desired work of the grinding wheel. The profile of the cam 24 acts on the probe 13 like the profile of a part to be reproduced and the edge 21 by regulating the arrival of the pressurized fluid, determines a

file

The approach, plunge, stop and rapid return movements of the grinding wheel carriage are thus controlled with a precision of

rotation by the motor 25 and its reduction gear 26 and whose profile is determined

There is also a valve, the edge 21 of which, by controlling the duct 22, adjusts the pressure of the oil which flows through the valve 19 into the chamber 15. It will be observed that the duct 22 is here provided in the body of the frame, that the position of the chambers 15 and 18 is reversed with respect to that of figs 1 and 2 and that the piston 12 is secured to the carriage 2

Finally, the pipe 23 returning the oil to the reservoir 17 instead of being flexible, can be provided in the body of the frame. Subject to these reservations, the operation is quite similar to that of the previous device. The arrival of the pressurized fluid in the chambers 15 and 18 is regulated by the edge 21 of the valve controlling, as previously, the movements of the piston 12 and consequently of the carriage 2 to which it is integral.

3 and 4 on the other hand, 19 axis and the motor 25 of this cylindrical cam being in this case carried by the console 27 integral with the frame 1 of the machine.

CLAIMS.

lo- Device for controlling the movements of the tool holder or the workpiece holder of a machine tool with continuous and automatic production cycles, characterized in that these movements are transmitted from a rotating cam of a profile determined in depending on the displacements desired by a hydraulic leakage control mechanism of a known type for the displacement of a reproduction tool as a function of the profile of the part to be reproduced., the feeler of this known device cooperating with said rotating cam.

that the cam rotates around an axis integral with the fixed frame of the machine., while the probe and its control piston are integral with the mobile carriage of the machine.

that the cam rotates around an axis integral with the mobile carriage, and the probe is integral with the frame <EMI ID = 24.1>

in that the cam is flat and acts by its profile against which the probe rests.

in that the cam is a cylindrical drum and the profile controlling the movements of the feeler is constituted by a helical groove formed on this drum.