DE2613260A1 - TURNING HEAD FOR DIGITAL CONTROLLED TURNING BARS - Google Patents

Description

Paienirrr.vdf

Bwwchar GiroüaV / ivü.c .: '. .... .'ι. Jioi

BANDERA Franco, Legnano (Milan), Via Cantü, 30

Turning head for digitally controlled ■ lathes

The present invention relates to improvements in digitally controlled machines such as lathes and in general Machine tools.

The invention is essentially based on a rotary head indicate, which is characterized by simpler production and thus less effort. In particular, the The invention is aimed at providing a rotary head which, through the use of only one EIeJk ι j oventil, is exactly in the desired position

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Position is adjustable _} whereby both electrical components as well as hydraulic lines and electrical cable conductors can be saved.

Another object of the invention is to provide an automatic turret which, despite being simple to manufacture, is more reliable Operation guaranteed.

In order to achieve these advantages, a rotary head according to the invention is proposed for the above-mentioned purpose, characterized by a rotary device (PG-GR) of the rotary head ₅ which is actuated by a first differential cylinder-piston arrangement (CM, a .PI-pi), a second differential cylinder piston arrangement (CY- PV) whereby the rotary head ( ¹ I ¹ O) (To the movable cylinder (CY) forms the two cylinder-piston arrangement-, olno first coupling (IN ) the rotation of the rotary head oriuMossiblej a two.ito coupling (H ¹ '), which causes the blocking of the «rotary head η ('! 'θ) - (viii CIiIyJfVt ¹¹ H electro valve (EV), the three]) ob .t \ iobMrtUil.Uuitfoii (l, H, 1! IL), whereby in tier ersl-en, Sl, oLlimg (L) by actuating the second clutch (IF) dm · rotary head {iCiHperi-t wi i « tl, in the second position (IX) its l''ro.i.gabtj ei-rolfcl; and by actuating the first clutch (IN) the rotary head threatIVmI with the through the Zahn.slwingo ( CK) aiifvol.i · i planes k: ü'.y, ol (l '(i) is connected and in do. ν dr.iltoii Sl.e'l .Ί.ηη / ί (lil.l.) del 'Di'ehkopf (TO) under the effect of dm oi'wJIhnl-en y, wei d if ftu'enl .ia I en cylinder-piston arrangement (CY-IM 'or l'Xp.i.) ^ imwiu /.ent-f i.erl. the locked position.

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The drawing shows an exemplary embodiment of the £ * · \. «« I * ■ ■ "^. They show:

Figures 1, 2 and 3 in vertical section a ·

inventive rotating head u.zw. in each case in the _{locked position (I)}} when released or when turned to assume a new position (II) and when turned (III) in the opposite direction to the direction of rotation according to Fig. _2f to assume the program position.

Figures 4> 5 and 6 in vertical section along the section line S ₁ the locking adjustment pawl or in the respective positions I, TL ₉ III according to Figures 1, 2 and 3 ·

Figures 7 and 8 show two polar diagrams for the operation of the to illustrate the rotary head according to the invention.

In the following description, for the sake of clarity, the made the following breakdown:

I: General mechanical construction

II: Hydraulic-electrical lines

III: Mode of operation

IV: diagrams

I: GENERAL MECHANICAL CONSTRUCTION

CA denotes a relatively solid part, e.g. the cross-section on which a base plate PK is rigidly attached; the latter includes a device that locks and rotates in the opposite direction

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of the actual rotary head T0_. In a known manner, the rotary head _T0_ is permanently connected to several tools ΧΓΓ. _Assume} that the tools are four and thus removed at an angle of 90 ° from each other, are (see FIG. Also Figs. 7 and 8).

In order to carry out the said working rotary movements of the rotary head T0_, a rack CR is provided, which belongs to a first differential cylinder-piston arrangement ΡΙ-ßi. That is to say, it has a larger piston P1 on one side, which can be displaced ^{in a cylinder space CM, and on the other side a smaller piston Bi which can be} displaced in a cylinder space cm of smaller diameter.

The rack is continuously in engagement with a pinion PG which forms a rigid unit with a vertical cylinder shaft AL. A flange FG of the cylinder shaft AL is machined with front teeth FR. These teeth FR engage in opposing teeth CD, which are machined from a transverse wall PT of the rotary head TO and form a first front tooth coupling IN. It is obvious that only when the teeth FR engage in the opposing teeth CD of the clutch IN is it possible to specify a rotary movement for the entire rotary head by means of the rack and pinion.

A second front coupling IjF is provided, consisting of a plurality of teeth DN machined from the base plate and a plurality of opposing teeth DD machined from the bottom of the rotary head, this second coupling fulfilling the task of securing the rotary head in cooperation with a pawl (bolt) SA to adjust exactly to the desired angular position. The pawl is polarized duroh a spring MO and has a tooth DT on _t as

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rectangular trapezoid, the flank in the direction of rotation = direction of the rotating head is inclined. The lowering movement is the Rotary head TO. given up by the fact that a second differentia = le cylinder-piston arrangement through the gradual formation of fixed central part UP- rigid with the Piston PP base plate is attached - shows. Due to such a gradual formation of the central part, two result RHume, u.zw. the upper larger room GI and the smaller one lower space GG, whose differential effect is still with reference to the operation of the rotary head is described. The piston PP is attached to the central part UP by nut NJ £.

II; HYDRAULIC-ELECTRICAL LINES The hydraulic circuit that allows the rotating head TJ) to be driven automatically will now be described, together with the description of the electrical circuit, but limited to the parts that are important for understanding the invention.

Only one solenoid valve EV is provided, which has three working positions, which are designated with I, II and III, can take and which correspond to FIGS. 1, 2 and 3, respectively, with the pressurized liquid in position (I) the space GG under the piston PJ? feeds, along which the differential cylinder CY runs, in the second position (II) the pressurized liquid is introduced between the piston PP and the transverse wall (space GI) of the rotary head; un in the In the third position (III), the two (differential) spaces GjE and GG are relieved of pressure Fluid supplied. "The solenoid valve EV was drawn as executed ttblioh and is divided by two Electromagnets a and b controlled. With P is the line

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for supplying the pressurized fluid coming from an IcL into a hydraulic center and with S _- the drainage line. Two lines Λ and B can be supplied from the Ilydraulikzentrale through the solenoid valve.

The line Λ which can be provided through the electric valve EV leads directly in don Ramn CiC with a smaller usable cross section of the second di fforentialon cylinder-piston arrangement (PP-CY) and stands also in connection with the room CM dos Kolbens Pl. the second line B divides -sloh into two lines bb_ and ba, Of which one (baj opens into the barely CrI next to the transverse wall FT (when the rotary head TO is in the lifting position according to FIG. 2 and ni ^ in connection with the space cm of the smaller piston stands. There is a kickback between the leads b_b and ba

connected to the passage of the uvibor pressurized liquid directly from! the derivation bb_ to prevent the derivation on. The other derivation bb, mttndok Ii J ιι ^, ο ^ οιι .stcjts in tion by the largeroro Nutzi.M / lohe dos I) i l'i'nroiiUiaXzyliiuloi'N limited space (IT.Tu ixiJcaTiiii-.t «· Ιίοί , Ηο is (; l.'ifi ·, jculo .Mluü lung dos]) rolikoj) l.'n, s TO tjl.n ll.'i nkt.i'okoiibaM- CAi. v <uv ', o; iolmii (a.hjd Im angonommonon Βοί.Ημi & 1 lot. · Koutakt-n 1 ^, 2 ^, X _f and / L), di ο cfiu't'.li a .nicht dargostollton and bokannbfj Vv ^ f ^r , x ^% nn \ m iopvorr.i clil.iiiig can be triggered, w «boi a Sohhoj. ¹ SS Ix ^ kaniU.di. · Λι. · Ί, when turning the rotary head to dor Ri ohtuii / ·· DK (wlu gosehen from above) the vorschiodonon contact » CO ₁ (JL _f 2 ,, £ _} ^ J scans.

ΤΠ; ÜETKlEHSWBTSIi

After the inventive Drohkopl. "T (J in .sol non wnsoiilill. Ί ~ chen parts boschriobon would, i'ol / vl; uiiii di (< his liotriobswoino.

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At Stolluiiff T do.s H]. (Ikl.rovtml. I J η H_V i hI- cl «u · naohdom d: io fJiiomiiiK ' uhh l) iM'lik (» iil.' (^ S diu'tili <l I η iVuhLmo 11.1 / ', »

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Coupling IF for the entire (programmed) work ... time of the tool UT. is caused. After .. working hours, the schedule controller gives a signal to the electrovalve EV, whereupon it changes from position I to position II (Fig. 2), whereby a reversal in the supply of the main lines A. and B takes place. At first (time ^ \ T) distance Q in the diagram) the rotary head is only raised (actuation of the first coupling IN on the front) and a simultaneous neutralization of the second coupling IFj on the front, however, as soon as the opening LU of the derivation ba is exposed, it is turned (Zext Λ. T) of the rotary head until the sensor SJ3 reaches the operational electrical contact (Fig. 7 and Fig. 8). As soon as the sensor SS detects the electrical contact brought into operation by the schedule controller, eg the 2nd, the electrovalve EJT "selBst = active., Position III (de-energization of the electromagnet b_), the two main lines A and B_ with the It should be emphasized that due to a phase shift of the contacts (1, 2 .... 4), the rotation of the rotary head is slightly greater than 360 ° K 7 here, K means the first (l.) , second (2.) , drxtte (3.) (nl) Angular position of the rotary head ^ - which results in a / ^ - S increase in the rotary head run s, as indicated in the diagram (n is the number of positions) during running of the rotary head counterclockwise (as viewed-Pfeij top DR) aüß.! recesses RE / conjugated form which are provided in the bottom of the rotary head TQ, i & pringt and. that its task is the rotary head accurately for the subsequent barrier working ang set, the differentiation of the piston PI ₁ and piston p_i of the rotary head results in a clockwise rotation of the rotary head (as seen from above, direction DIE) ,

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until the pawl locks the rotating head with its vertical straight part. Furthermore, by differentiating the RHume GG and GI, the rotary head remains stationary in the upper position until the response of the timer _3, which energizes the solenoid valve a ^ again and thereby lets the electrovalve EV fall back into the position shown in FIG. 1 and thus the rotary head goes into the locked position .

IV: DIAGRAMS

In the polar diagrams according to FIGS. 7 and 8, the time is radial and the rotation of the rotary head is circumferentially (in radians) from 4_i. in the IU. Position according to FIG. 7 and from the 4 ia the 2li. Position indicated according to FIG. 8 (use of contacts 4 and 3).

The diagram according to Fig. 8 shows how the rotary head has switched to position 2. u.zw. by the fact that the 3 · contact was triggered. It should be noted that the duration T of the operation is always constant because it is determined by a timer and that it is slightly longer than the time for a 360 "rotation of the turret, ie from the first position to the penultimate position to arrive, as in the assumed case.

In a first stage (/ ^ T ₁ ) the lifting of the rotary head, designated by the distance 2, takes place and in a second stage (time A T) the rotation of the rotary head by a distance which is slightly greater ^{than ι 3 6Q 0} K (here η means the number of stations and K the order of the stations, i.e. 1,2,3), in the first case a little over 90 ° (distance, Z of Fig. 7) and in the second case over 270 ° (distance Z of Fig. 8 ). A third stage begins as soon as the operational contact (1 ° or 3 °) has been detected by the sensor, ie the return stage (G) follows within the time (Δτ) and thereafter

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a rest level AT which is determined by the timer
until the total time determined by the timer reaches T_

is (T «AT _n + At + At + Δ τ). From a comparison ^v 1 2 3 4

The two diagrams show that the dead time is so
The lower the distance the triggered station is.
Of course, the total time is for anyone
Work process always the same, dU = T.

Since the expiry time of the operation is determined by the reactivation of the solenoid valve a_, it can be said that the position according to FIG. 1 is established again immediately after reactivating the solenoid valve a.

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Claims (3)

Claims [1./Turning head for digitally controlled lathes characterized by a turning device (PG-GR) of the turning head ₃ which is supported by a first differential cylinder-piston arrangement (CM, cm PI-pi) is actuated, a second differential cylinder-piston arrangement (CY-PP) wherein the rotary head (TO) forms the movable cylinder (CY) of the second differential cylinder-piston arrangement, a first clutch (IN) which the Rotation of the turret enables a second clutch (IF) that locks the turret (TO), a single solenoid valve (EV) that can assume three operating positions (I, II, III), in the first position (I ) by actuating the second clutch (IF) the rotating head is locked, in the second position (II) it is released and by actuating the first clutch (IN) the rotating head is locked in rotation with the pinion (PG ) is connected and in the third position (III) the rotary head (TO) under the action of the mentioned two differential cylinder-piston arrangements (CY-PP or PI-pi) takes the locking position exactly centered. 609844/0308 261326Ü 2. Rotary head according to spoke 1, characterized in that the cylinder (CY) of the first differential cylinder piston Arrangement (CY-PP) with a discharge line (ba) of the hydraulic control circuit (A — B) cooperates like a slide, so that the rotary head (TO) can only turn as soon as the first coupling (IN) has been unlocked. 3. Rotary head according to one of the preceding claims, characterized in that a hydraulic control circuit is provided which comprises two main lines (A and B), one (A) in the space (GG) of larger cross-section of the second differential cylinder piston Arrangement (CY-PP) and in the larger cross section (CM) of the first differential cylinder KölfoJea arrangement * (GH ^ sm (iPP ~ pi) opens, and that the other main line (B) has two derivatives (bb-ba) includes, of which the outlets (bb-ba) open into the space (GI) of larger cross-section of the second differential cylinder-piston arrangement (CY-PP) and the outlet (ba) opening into the space of smaller cross-section (pi) through a check valve (VR) is separated from the other derivative (bb). 609844/0308