DE3043361C2 - Automatic pallet changing device for machine tools - Google Patents

Description

The invention relates to an automatic pallet changing device for machine tools according to the preamble of claim 1.

The state of the art includes a cutting machine tool with automatic pallet change , on the frame of which a slide is arranged to be horizontally displaceable. Furthermore, a work table is provided which can also be moved horizontally along an axis that runs at right angles to the axis along which the slide can be displaced The work table has guides for moving pallets with workpieces carried by them. The known machine tool also has a device carried by the work table for automatic pallet changing. This device comprises a fixed frame which supports a rotating platform with two stations. Each station has guides for placing and moving pallets carrying workpieces. A device for moving a pallet from the station to the work table and back is provided on the rotatable platform at each of the stations. The platform has a rotary drive and devices for moving the pallets longitudinally. Three movements are required to carry out the pallet change: shifting the pallet with the processed workpiece to one of the stations, rotating the platform and ver

moving the new pallet onto the work table.

The known device has the disadvantage that the three described above for a pallet change Movements are necessary because of elongation tion of the non-productive time extends the piece time and thus increases the stucco costs

The object on which the invention is based is therefore to provide the automatic pallet changing device for machine tools according to the preamble of claim 1 so that the Pallet change can be carried out with a smaller number of movements

This object is achieved with the features of the characterizing part of claim 1 welehe are advantageously designed in claim 2.

The pallet changing device according to the invention has the advantage that only one movement is required is when the pallet with a machined workpiece is replaced by a pallet with a workpiece to be machined The workpiece has to be replaced significantly reduced In addition, the external dimensions of the machine tool are reduced '

Although it is already known from GB-PS 15 47 470, guide sections for a machine tool Pallet transport in the paietten change position of the To provide tables on the table and on the feeder device, which allows a straight-line displacement of the carriage allow with the pallet. However, in the known device, two separate drive devices are used used to move the pallets along the guide sections. The construction of the feeder device does not allow them to be used in machine tools with a movable work table use, as this is another device for moving the pallet from the car from the Guides on the work table would be required.

The invention is illustrated by means of exemplary embodiments with the aid of drawings explained in more detail It shows

F i g. 1 side view of an embodiment of a machine tool with an automatic pallet changing device,

Fig. 2 plan view of the machine tool according to Fig.l,

F i g. 3 the section III-III from F i g. 2,
F i g. 4 the section IV-IV according to FIG. 2,
F i g. 5 design variant of the machine with automatic pallet changing device according to FIG. 1 in plan view.

A machine tool with the automatic pallet changing device according to the invention has a frame 1 (FIG. 1) with guides 2 for a slide 3 that is horizontally displaceable in the direction of the axis X. The slide 3 has guides 4 on which a work table 5 can be displaced along the axis Y, which is perpendicular to the X axis (Fig. 2).

A device 6 for centering and clamping pallets is attached to the work table 5. on the surface of this device 6 are two guides 7 and 8 for placing and moving pallets 9 or 10 provided. The guide 7 is flat and the guide 8 is V-shaped.

The guide 7 takes the weight of the pallets and the workpiece carried by them, while the Guide 8 shows the position of the pallets as they move from the device to the automatic pallet change on the work table and back. The pallets 9 and 10 are provided with rollers on which they are

3 4

can move over the guides 7 and 8, with attached pallets 41, 42 and 43 being coupled,

the guide 8 comprehensive storage of the pallets so that there is space for three pallets on the device 23,

is executed that their radial displacement is relative instead of the bracket support 27 (Fig.2) a corresponding

provided for guidance such a projection on the plate 49 is provided.

The guides 7 and 8 can be arranged in the direction of the valve 5. This embodiment of the device 23 is expedient.

be cushioned when to clamp the pallet on gerwtise in an automatic machine tool

the work table 5 to apply a shift of the pallets, which for long-term operation without

The constant presence of the machine operator is required on the surface of the device 6

The movement of the work table 5 along the X axis is

takes place with the help of a motor 11, which is driven by a spindle 10 The stations in which the pallet 10 is on the plate

12 (FIG. 3) with the work table 5 connected 25 (FIG. 2) or the pallets 41, 42 and 43 (FIG. 5)

which is to be attached to the plate 49 of the device 23,

The movement of the work table 5 along the axis Y is carried out by any known method, both

together with the carriage 3 is carried out by a motor, for example with the help of spring-loaded and controllable fixed

13, which is set via a spindle 14 (not shown) with 15 digits

the slide 3 is connected gearbox. With the slide guides 2 of the frame 1 are on both sides of the

Stell 1 is a column 15 (Fig. 1) with guides 16 rigid carriage 3 through protective devices 50 (Fig. 1) and

connected, on which a slide 51 is covered along an axis Z, the protective device 51 under the

17 is vertically displaceable on which a headstock 18 plate 25 is arranged so that it is the displacement of the

is attached to a spindle 19 which does not interfere with the 20 pallets

Embodiment is arranged vertically, however, the guides 4 of the carriage 3 are on both sides of the

can also be arranged horizontally. Work table 5 through protective devices 52 (Fig. 2)

The spindle 19 is attached to and 53 covered by an electric motor 20

drove. The displacement of the headstock 18 ent- The machine tool is with a numerical

along the Z axis is carried out by a motor 21, which is provided via 25 control device, on its commands

a spindle drive 22 with the slide 17 of the spindle - all work and auxiliary movements of the drives

stock is geared to the machine tool.

The machine tool with automatic pallet changing device works as follows:
The changing device 23 is on the work table 5. During the work the machine tool is arranged the working part can be a plate 25. On the plate 25, two table 5 movements along the axis X and guides 7a and 8a are rigidly attached. The guide Ta is flat together with the carriage 3 and the bracket supports and the guide 8a is V- shaped 26 and 27 run along the axis ^.

The guides 7a and 8a have the same profiles 35 The pallet 10 is meanwhile in the

and follow the same curvature as the guide 7 and fixed position on the plate 25, being with the

8 on the work table 5, which belong to the device 6. Stops 30a and 306 of the arm 30 of the pivoting lever

The automatic pallet changing device contains bels 28 is coupled. In this position, the pallet

in addition, an ante 10 on the stationary substructure 24 removes the machined workpiece and puts it in

arranged pallet shifting device and on the Schiit 40 new workpiece applied to the same with this

th 3 fixed bracket supports 26, 27, on the top of which takes place simultaneously with the machining of the workpiece

Surface guides Tb, 86 and Tc, Sc are arranged. that on the pallet 9 located on the work table 5

The guides Tb and Sb are located on the Kon- is attached

Solträger 26 and the guides Tc and 8c on the con- The pallet changing device 23 is with respect to

Solträger 27. 45 the work table 5 of the machine tool in such a way

When the work table 5 is set in the pallet, the station of the work table 5 is arranged at

Change position form the guides 7,8, Ta, Sa, Tb, Tc, pallet change in the end positions of the same on the

Sb, 8c closed orbits and are located as parts of circular axes X and Y. Therefore the arm hinders

arcs executed 29 of the pivot lever 28 any possible coordinate

The pallet shifting device is not as a 50 th movements of the work table 5
Pivoting levers 28 with arms 29 and 30 formed which, after the machining of the workpiece has been completed via respective stops 29a, 296 and 30a, 306 with the one on the pallet 9, the work table 5 will interact according to the pallet 9 and 10, respectively. Here, the number of arms of the swiveling lever 28 of the total number of pallet change positions is moved to the program of the numerical control device.

The pivot lever 28 (Fig. 4) is via a coupling sene tracks (in the given specific example, concentrated

31, a shaft 32, gears 33,34 and 35, gears 37 tric circles), while the pallet 9 with the stops

and 38 (FIG. 3) with a motor 39 for pivoting 29a and 296 of the arm 29 of the pivot lever 28

of the lever 28 connected 60 is coupled.

On the device 23 for the automatic pallet, the transport guides 7 of the work change form the in FIG. 5 shown machine tool sches 5, the guides 7a of the plate 25, the guides are several pallets, in the example described Tb of the console support 26 and the guides Tc of the convoy pallets 40,41,42 and 43, attached The lever 44 solträfcers 27 and the Guides 8 of the work table has in this case four arms 45,46,47 and 48, which with 65 5, the guides 8a of the plate 25, the guides 86 of their respective stops 45a and 456,46a and 466, bracket support 26 and the guides 8c of the console 47a and 476, 48a and 486 with the on the work table 5 gers 27 a uniform closed path from the attached pallet 40 and the guides mentioned on a plate 49. Furthermore, on the command of the

5 6

Control device releasing the pallet 9 on the ' Work table 5, the unlocking of pallets 9 and 10,

if the locking devices are used as controlled gears> 1

are executed, and the pivoting of the lever 28 by _f

180 degrees, at which the pallet 9 is simultaneously on the 5,

standing uniform closed tracks of the transport guides 7, 7a, 7b, 7c and 8, Sa, Sb, Sc on the

Plate 25 of the device 23 moved and fixed there, V

is placed, but the pallet 10 on the work table 5 4

is moved, where it is necessary to execute another 10 st

the working cycle is determined and clamped. k

If the pallet changing device 23 (Fig. 5) three ti Has loading stations on the plate 49, then %

the pivot angle of the lever 44 90 ° or - ^ - degrees _{,, β}

/ 7 + 1 15

where η denotes the number of stations and must be somewhat larger than the total angle of the transport guides 7 and 7b, S and Sb on the work table 5 and the bracket support 26.

20th

For this purpose 3 sheets of drawings

25th

30th

35

40

45

50

55

60

65

Claims (2)

Patent claims: 1.Automatic pallet changing device for machine tools, which has a frame with a slide arranged on it so as to be displaceable in the horizontal plane along a coordinate axis and a work table which is also arranged on the slide so as to be displaceable in the horizontal plane along a coordinate axis perpendicular to the first coordinate axis, with a stationary substructure, Führungsabschnit- · ■ th for shifting the pallet on the substructure and the work table and a drive device for transporting the pallets from the stationary base to the work table and back again, characterized in that additionally at least one cantilever (26 and 27) with guide portions (Jb and Sb, 7c and 8c) is provided for moving the pallets (9 and 10) which, when the work table (5) is set into the pallet changing position, together with the guide sections (7 and 8) on the work table (5) and the guide sections ( 7a and 8a) form a common closed path of guides (7, 7a, 7b, 7c and 8, 8a, 8b, 8c) on the fixed substructure (24). 2. Automatic pallet changing device according to claim 1, characterized in that the inner (7, 7a, Tb and 7c) and the outer (8,8a, 8b and 8c) guide sections for moving the pallets are designed in the form of concentric circular arcs and that the Drive device in the form of an equal-armed lever (28) pivotable around the center of the circular arcs, in which the number of arms (29 and 30) is equal to the total number of pallets (24) and the work table (5) arranged on the base. 9 and 10).