DE2031219A1 - Tool changing device for tool machines - Google Patents

Description

DR. KURT-RUDOLF EIKENBER3

PATENT ADVOCATE

HANNOVER · SCHACKSTRASSE 1 · TELEFON (OStI) 8140 08 · KABEL PATENTION HANNOVER

Soc. (JRAZIANO & C. & n.c. 202/12 _; |

Tool changing device for machine tools

The invention relates to a tool Weohselvor- ■ direction for machine tools, in particular for ^v horizontal lathes in which the

009882/1599

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Tool-holder head on a movable transversely to the ^{machine> l} first saddle sits, in turn, on a second
In the longitudinal direction of the sewing machine movable saddle is arranged,
and in which a tool holder magazine is provided
the tool holder are interchangeable with tool holders on the tool holder head. . :

In known tool changing devices, '

a stationary magazine is provided, which contains all the j

Contains tools for the work cycle, with means before j

can be seen to remove a new tool from the magazine

and replace the previously used tool. At ι

the known devices, however, require "';

to interrupt the workflow when changing tools, so j

that considerable dead times arise.

The invention is based on the object of a!

To create a tool changing device in which the change:

is possible during the work process, so that dead;

times can be avoided. ' \

This object is achieved according to the invention in that a tool is moved from an exchange position to a | Working position is movable that the tool holder magazine
rotatable above the working level of the machine tool
sits on a first sledge that rises across the machine
Guides is movable, which in turn can be moved to @ in @ m

009882/159 9

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The second slide is seated on guides in the longitudinal direction the machine is movable, the means for automatic

Positioning of the magazine according to the positions

the tool holder head, means for rotating the head, for clamping a tool in the working position and for the solution of another tool in the exchange: * position as well as means for the automatic transport of a '

Tool to the magazine and vice versa are provided. j

The invention is described below with reference to an in the embodiment illustrated in the drawing explained in more detail. In the drawing:

Flg. 1 is a schematic side view

a lathe with the tool changing device according to the invention;

Fig. 2 is a corresponding cross-sectional view the line 2-2 in Figure 1;

Fig. 3 is a vertical longitudinal section of the

Tool changing device along line 3-3 in FIG. 1;

Fig. 4 is a plan view of the tool holder head shown in Fig. 1;

Fig. 5 is a cross section corresponding to FIG Line 5-5 in Figure 3;

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BATH ORIGINAL

Pig. Figure 6 is a perspective view of the head of Pig. 4 and

Pig. 7 shows a cross section of the tool magazine along the line 7-7 in Pigur 3.

In Pig. 1 and 2, a horizontal lathe 10 is shown, which contains a putter 11 and a tailstock 12, which is displaceable in the longitudinal direction to fix a workpiece, not shown. The lathe further includes a first, displaceable in the longitudinal direction _(saddle 13 »which is provided at the top with a dovetail-shaped transverse guide 14 in which a second m saddle 15 carrying the rotatable tool-holder head 16, in the transverse direction can be displaced. On the head 16 are diametrically opposite two tool holders 17 and 18 and by rotating the head about its vertical axis, a tool holder can be moved from an exchange position corresponding to the position of the tool holder 18 in Pig. 4 to a working position corresponding to the position of the tool holder in Pig.

At the top of the head 16 is appropriate

009882/1599

Way a tool holder magazine 19 attached, which is around a vertical axis 20 is rotatable. At the top, the axis 20 is attached to a slide 21 that can be moved transversely to the lathe, which is carried by transverse guides 22, which in turn in a second slide 23 sit on guides 24 in The longitudinal direction of the machine is displaceable. The! Tours! 24!. i are in end traverses above the working surface of the lathe! 25 and 26 stored.

The movement of the saddles 13 and 15 takes place by means known per se, which are not shown, because they are not an essential rope of the present invention form. The movement of the magazine 19 according to the longitudinal and / or transverse movements of the tool holder head 16 can via the head 16, or in the case of digitally

'Controlled lathes can the magazine 19 directly over the program controller 27, which controls the working cycle of the lathe [can be driven. In the latter case one will i naturally suitable pneumatic, hydraulic or electric j " Provide controlled means, which by the program control unit j be driven and for the longitudinal and / or transverse movement!

of the magazine 19. For example, this control can consist of two pneumatic cylinders' \ medium, which are arranged between the associated slide and a stationary with respect to the carriage part. However, gear drives can also be provided as control means, with

, Racks are formed on the mentioned guides that

0098 8271599 j

BATH

cooperate with corresponding pinions, which are

motors arranged on the slide are set in rotation.

In the exemplary embodiment shown;

is a mechanical drive connection between the tool '

holder head 16 and the magazine 19 are provided. Here acts!

it is a simpler embodiment, but it is not;

should be viewed as limiting the invention. j

According to Pig. 3, 4, 5 and 6 is the tool holder

head 16 around a vertical pin 28 (Pig. 3) between two;

Rotatable angular positions that are 180 apart from one another ■

are, between a work position accordingly '

the position of the tool holder 17 in Pig. 4 and a \ tool holder exchange position corresponding to the position

of the tool holder 18 in Pig. 4 * In the working position!

the tool holder 17 is blocked on the head 16 as follows. is described, while the tool holder 18 in the exchange; position is released, and by another, with a

tool holder provided with a new tool can be replaced. ί

The head 16 can correspond to the double arrow 30
in Pig. 3 moves up and down and according to the
Double arrow 31 in Pig. 4 can be rotated in both directions,
a used tool for a new tool
exchange and put this new tool in its place

0098-82 / 1599

BATH ORIGINAL

bring. The head 16 therefore eats on the rotatable vertical Pin 28 is secured, for example, by means of a wedge 32, and the pin 28 is subject to axial movement and axial movement Rotational movement caused to achieve the above-mentioned movements of the tool holder head 16 eu, as follows is described. According to Fig. 3, the pin 28 is rotatable in the Transverse saddle 15 mounted by means of the side bearings 33 and a ball or thrust bearing 34, which is at the lower end of the pin 28 arranged 1st. This thrust bearing 34 is in turn seated on a piston 35 movable in a chamber of the saddle 15. The movable piston 35 and consequently also the pin 28 and the head 16 can by introducing pressure fluid into the chamber 36 between the opposite surfaces of the movable piston 35 and a lower end plate 37 are moved a little vertically upwards. The pressure fluid is introduced through a suitable feed 38, the attached to the side of the movable saddle 15 1st and is connected to a pressure fluid reservoir (not shown) by means of hoses (not shown). Of the movable piston 35 is also provided with an edge seal 39 provided, which prevents pressure fluid from reaching an upper chamber 40 in which a plate spring 41 or other equivalent means are arranged, which act on a peripheral flange at the lower end of the pin 28 to this lower when the pressure fluid in the chamber 36 is discharged.

009882/1599

ORIGINAL INSPECTED

While dee Work sequence of Maeohlne the tool holder head must be stationary 16 and is therefore clamped to the saddle 15 by means of cross-conjugate conical surfaces 43, which are provided on the head and 16 x Quereattel

The rotation of the pin 28 and consequently of the head 16 in the upper position is by means of a hydraulic controlled gear drive causes »as in Flg. 3 and 5 is shown.

Near the lower end of the pin 28, a circular toothed crown 44 is provided with a toothed rack 45 Is engaged. The rack 45 is provided on the side of a double-acting piston 46, which is in a transverse chamber 47 of the saddle 15 can be moved back and forth · This chamber 47 is at the ends with feeders and 49 provided for the pressure fluid that does not have Hoses shown connected to a Druckiltteelgkeitsreeervoir are · When pressure fluid is supplied through the infeeds 48 or 49, the piston 46 moves in the one or the other direction and 'caused thereby a rotation of the pin 28 and thus the head 16 by 180 ° 180 °

Clamping and loosening a tool holder from the head 16, an anchor rod operated by a curve (Fig. 3) and two brackets cause it. It should be noted that in j Flg. 3 only the tool holder 18 in the exchange position ί

009822/1599, .., ...,

ORIGINAL INSPECTED

and the associated plague remedies are shown. Naturally the other tool holder is clamped in the working position by means of a similar unit.

According to FIG. 3, the tool holder 18 has on the . The rear side has a vertically extending cutout 50, j the head 51 ′ of an anchor rod 51 in the longitudinal direction thereof can slide. You radially protruding anchor rod 51 is seated at the head 16 and is at its rear end with a Eccentric 52 provided, the. Profile of a first curved path follows. The cam track 53 is provided at the upper end of a tubular extension of the saddle 15. The profile of the curve is dimensioned so that the anchor rod 51 in the exchange position for the purpose of releasing the tool holder 18 to the outside . is forced while the anchor rod 51 is in the working position by means of a plate spring 51 ″ or similar means is pushed inward to clamp the tool holder to the head 16 '. Bas plague clamps of the tool holder on the head is effected by two bearing brackets, namely a stationary bracket 54 and a movable bracket 55 »die : sits on the side of the head 16. The movable bracket 55 becomes j clamped in a similar way by means of a second anchor rod, not shown, which is guided by a curve 55 * (Pig 3) is controlled. The cam surfaces 53 and 55 'are so appropriate! arranges that when the head is turned for the purpose of conveyance ! of a toolholder from the exchange position to work «· position the curve 55 'first the anchor rod of the movable

009882/1599

Clamp releases so that the tool holder exactly against the stationary clamp 54 is brought. Then the curve 53 triggers the anchor rod 51, which under the action of the spring 51 " clamps the tool holder on the tool holder head. The contact between the tool holder and the head takes place on cylindrical surfaces that are designed to match each other exactly.

Each tool holder is provided with an upper projection which has a transverse attachment 56 for engaging in a nut lock 57 or the like so that the tool holder moves to or from the magazine as described below.

Pig. 3 and 7 show that the tool holder magazine 19 is hollow on the inside and on its side surface is provided with several longitudinal guides for receiving different tool holders, each of which is a different one Contains tool that is used to perform one of the various operations on the workpiece.

The magazine 19 is rotatably mounted about the vertical axis 20 and the rotation is carried out by an electric motor 60, which is firmly connected to the Achs® via an arm 61 The motor shaft is connected to a gear 62

009882/1599

8even, the one with a toothed crown 63 inside the magazine is engaged. The gate access from the program control panel or the drive device of the machine tool controlled Motor 60 causes a predetermined rotation of the magazine 19, to a predetermined Werkseughalter from a rest position to bring into an output or lowering position which is coincident with the exchange position of the tool holder 18 on the tool holder head 16. At a predetermined location within of the magazine 19 is a reading member 65 and a sensor 66 Provided stationary with respect to the magazine, wherein scanning means 67 and 68 on each tool holder or on the magazine 19 with a Angular distance from one another are provided and cooperate with the measuring device and the sensor in such a way that a tool holder is selected and precisely at the removal position is brewed. The scanning elements can consist of microscopic holders or other equivalent means, for example.

The passage for a tool holder, e.g. the tool holder 69, from the removal position in the magazine 19 for the exchange position on the head 16 is made of a device formed, the-one attached to the axis 20 of the magazine Contains guide element 70, elongated guide surfaces forming an extension for a housing guide of the tool holder located in the magazine 19 in the removal position. This guide element 70 stops shortly before the head, and is provided with an interior corner 71 on which the Nut lock 55 can slide along. At their upper end carries the worm 71 a gear 72 with a

009632/1599

arranged at the end of the shaft of a second electric motor 74

Gear 73 is engaged. The electric motor 74 or

other appropriate means _l Vle for example a hydraulic motor,

■ it is on an arm 75, which is attached to the Aohee 20 « Instead of the unit consisting of a screw and nut lock A hydraulic cylinder can also be used to lift the tool holder 69 from the removal position in the magazine to be transported to the exchange position on the tool holder head 16

In the illustrated embodiment

the movement of the magazine 19 is derived from the head 16. the Central axis 20 of the magazine is firmly connected by means of the element 70 to a telescopic element 76, which in turn is connected to the rotatable pin 28 of the head 16 so that it can also rotate in addition to vertical movement. Of course, however, the movement of the magazine 19 following the head 16 can also be carried out by other independent drive means be effected, e.g. by means of hydraulic and pneumatic cylinders, electromagnetic means which are directly operated by the machine's program control unit can be controlled. In In this case, when the used tool is exchanged for a new tool, it is also possible to use the magazine 19 move back to one of the machine tool ends, or else to a position away from the workpiece. Suitable sensing means for the position, for example on the magazine 19 and are provided on the head 16, allow the Auewahl correct relative position when a tool is changed again shall be·

009882/1599

The operation of the tool changing device is as follows: As mentioned, the head 16 can rotate 180 ° be rotated to turn a tool holder into one of two To bring positions, namely in a working position and in a tool exchange position; In addition, the head is vertically movable so that the saddle 15 underneath is released when the head is to be turned. It will therefore First a lifting process is carried out, followed by a rotation step and finally a lowering step.

During the lifting step, the head 16 is decoupled from the saddle 15. This lifting step is through introduction

! triggered by hydraulic fluid in the chamber 56 (Pig. 3).

! The force exerted by the hydraulic fluid lifts the head and compresses the spring 41, whereby the contact between the clamping conical surfaces 43 is released. As soon as the lifting step has been completed, the head rotates away. During this rotation step, one end of the Space 47 supplied pressure fluid, which causes the piston 46 to move in a predetermined direction. the with the tooth crown 44 of the pin 28 in engagement Rack 45 of piston 46 causes rotation of the Pin 28 and thus the tool holder head by 180 °. During this 180 ° rotation of the tool holder head, the new Tool that was previously placed in the replacement position,

: promoted to work position, and at the same time the

0098 8 2/1599

needed tool from the working position to the exchange position brought.

During this rotary movement, the curves 53 and 55 * act on the associated anchor rods, the on the one hand the solution of the tool holder in the replacement position and on the other hand the clamping of the tool holder cause in the working position. j

After the rotation of the tool holder head ί and thus the replacement of the tools has been carried out ₉ ', the lowering step of the head is carried out by stopping the flow of liquid into the chamber 36, so that the previously tensioned spring 41 moves the head 16 * back and clamps it to the saddle 15.

Immediately after the turning and lowering steps, the electric motor 74 is switched on and effected the rotation of the screw 71, whereby the mat closure 57 the lug 56 of the at the exchange position on the head 16 located tool holder 18 and takes the tool holder with the used tool to the corresponding, previously released housing guide of the magazine 19 promoted. Suitable microswitches, not shown, supply this Control unit with signals for setting the deflection movement for the nut lock and for stopping the nut lock at the two end positions

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The Mikroeohalter, which controls the stopping of the Muttersohlossee in the upper position »also takes care of the subsequent start of the motor 16, the rotation of the Magazine 19 causes. This rotation of the Magaeina 19 promoted a next factory cleaning device according to the reading precaution 65 The selection made see below the exchange position for the an- ™ closing movement tob Magasin sun tool holder head. The drive motor 74 for the screw 71 then becomes effective and ensures that the new factory cup holder in the kagaein in the above-mentioned manner to the exchange position on the Head 16 arrives.

From the above and from the drawings it appears that the device according to the invention enables an automatic tool change during the Arbeitsablaufββ "wherein equilateral selected the next Werkseug and EUR over the guide is provided in the division of labor * By erfindungsgemäfie device therefore dead times i avoided so that the loss of time when changing tools is limited to the time required to rotate the tool holder head β β. '

-Claims-

Be / kä

009882/1599

Claims (1)

Claims: 1. ) Tool exchange device for machine tools, at. those The tool holder head sits on a first saddle that can be moved transversely to the machine, which in turn is arranged on a second saddle that can be moved in the longitudinal direction of the machine, and in which a tool holder magazine is provided, from which tool holders can be exchanged for tool holders on the tool holder head, thereby jgekennz © It pays ₉ that a tool on the tool holder head (16) can be moved from a working position to a working position by rotating about its axis (28), so that the watch holder magazine (19) is rotatably seated on a first slide (21) above the working plane of the machine tool , the transversely rare machine on guides (22) is movable ', which in turn sit on a-wide slide (23), which can be moved on guides (24) in the Maschin® longer life, that means for automatic. Positioning of the magazine according to the positions of the .Toolholder «» 'head (16), means of the cross section of the head _ΰ % of the clamping of a tool in the working position tsafi su »solution of a 009882/1599 other tool in the exchange position as well as means for automatic transport of a tool to the magazine and vice versa are provided. 2. Apparatus according to claim 1, characterized in that the means for rotating the tool holder head (16) consist of a pin (28) fixedly connected to this, which is axially rotatably mounted on the first saddle (15) and provided with a toothed crown (44) which is in engagement with a toothed rack (45) which is fixedly seated on a piston (46) which can be moved automatically transversely to the pin in a chamber (47) of the first saddle, the chamber (47) at its ends with feeds (48 , 49) is provided for a pressure fluid to drive the piston in one direction or the other, and means are provided for plaguing and releasing the tool holder head (16) from the first saddle (15) when the rotation is complete. 3. Device according to Anspruoh 2, characterized in that the means for clamping and releasing the head (16) from the saddle (15) consist of konisohen contact surfaces (43) on the head and on the saddle and that the pin (28) is movable in the axial direction a second piston '(35) is mounted, which is movably mounted in a second chamber (36) of the first saddle (15), wherein the piston can be raised by means of a pressure fluid in such a way that the contact between the tool holder head (16) and the saddle (15 ) against the force of elastic means 0 0 9882/1599 is released and by the elastic means when discharging the hydraulic fluid can be restored. 4t device according to claim 1, characterized in that the tool is fastened to a tool holder element, that the means for clamping a tool in the working position and for simultaneously releasing a tool in the replacement position have a first anchor rod in engagement with the tool holder and for each tool a second anchor rod engaged with the movable bracket of a bracket pair for the lateral alignment of the tool holder on the head, the anchor rods being movable between a clamping position and a release position by means of cam control, and resilient means (51 ") acting towards the clamping position. 5. Device according to claim 1, characterized in that the magazine (19) rotates in the hanging state in order to convey one of several tools from a rest position in a lowering position of the tool located above to a replacement position of the tool on the head (16), and that means for triggering the rotation and for selecting a tool according to a programmed cycle are assigned to the magazine. 009882/1599 6. The device according to claim 1, characterized in that the means for conveying the tool from and to the magazine (19) from a gripping member at the tool exchange position Bowle from means for guiding and moving the gripping member holding the tool between the tool holder head (16) and the magazine (19) exist. 7. Apparatus naoh claim 6, characterized in that the means for guiding and moving the gripping member consist of a pneumatic cylinder arranged on the magazine. 8. The device naoh claim 6, characterized gekennzelehne t that the means for guiding and moving the gripping member from a Sohneoke (71) and a nut shell coupled to the gripping member (57) and a drive device attached to the magazine (19) consist which the Sohneoke (71) drives and then moves the gripping member along this. 9. Device naoh one of the preceding claims, - daduroh labels are worthwhile. d ate the magazine (19) with the tool -halterkopf (16) is telescopically connected to and driven in a suspended state thereof. 10. The device according to one or more of the preceding claims, characterized in that the means for automatic isohen positioning of the magazine (19) with respect to the tool holder head (16) mechanical, hydraulic, pneumatic 0098 32/1599 BATH ORIGINAL matlecher or electrical type, and are controlled independently of a control device of the machine tool "to move the magazine in the transverse and / or longitudinal direction of the machine " and that the tool holder head (16) and the magazine (19) with positioning means to determine their exact Position when changing tools. 009882/1599 blank page