EP2008736A1 - Machine tool and method for discharging a workpiece part - Google Patents

Abstract

The tool has a discharging device (17) provided at a workpice support for discharging a created workpiece part as a product of a workpiece process. The discharging device has two opening boundaries (17a, 17b), which are provided for forming an opening for discharging workpieces (12) together along a horizontal direction. The boundaries are deliverable under formation of different openings (D1, D2) for discharging the workpieces relative to each other by mutually switching along a horizontal direction in different positions (A1, A2). An independent claim is also included for a method for locking a workpice in a machine tool.

Description

The present invention relates to a machine tool for the separating machining of preferably plate-like workpieces, in particular of sheets, with a workpiece support and provided on the workpiece support discharge for discharging created as products of the separating workpiece machining workpiece parts, wherein the discharge device has two opening boundaries, which for training a passage opening for discharging workpiece parts relative to each other in the horizontal direction under mutual displacement undeliverable. The invention also relates to a method for discharging from a machine tool for the separating machining of preferably plate-like workpieces, in particular of sheets, as products of the parting workpiece machining workpiece parts by means of a discharge device having two opening delimitations, the formation of a passage opening for the discharge of workpiece parts relative be delivered to each other in the horizontal direction with mutual displacement.

As a generic state of the art, a machine tool is known in which a first opening limit is arranged fixed in the horizontal direction and a second opening limit can be moved relative to the first opening limit in the horizontal direction and delivered to a fixed position. Due to the movement of the second opening limitation to the fixed position, a passage opening is formed between the opening delimitations, through which the workpiece part can be discharged downwards. In addition, a flap is provided at the fixed opening limit, which can be pivoted downwards after or during the horizontal movement of the second opening limit, so that the passage opening formed during movement of the second opening limit is additionally widened. The displacement of the second opening limit is in this case sized so large that workpiece parts can be discharged up to a maximum dimension in the horizontal direction of typically 500 mm.

Object of the invention

It is the object of the present invention to develop a machine tool and a method of the type mentioned in that the discharge of workpiece parts can be done faster and thus the service life of the machine tool during discharge can be reduced.

Subject of the invention

This object is achieved according to the device by the fact that the opening limitations are under education differently further passages for discharging workpiece parts relative to each other under mutual displacement in the horizontal direction in different positions undeliverable.

According to the invention, it is proposed to provide at least two different positions in which the opening delimitations can be delivered in the relative movement in the horizontal direction and in which a passage opening is formed by the relative movement, through which a workpiece part can be discharged. The opening limitations can do this, for example be delivered to several different, each spaced-apart fixed positions.

In a preferred embodiment, the machine tool has a control unit for controlling the position of the opening delimitations in dependence on a maximum dimension in the horizontal direction of the workpiece part created during the parting workpiece machining. In this way, the one position can be selected in which for a respectively auszuschleusendes workpiece part, the discharge through the passage opening is just possible, so that it is ensured that the opening limitations in the horizontal direction need not be further moved than it is required for discharging the respectively created workpiece part , As a result, the movement path of the opening delimitations for the discharge of workpiece parts is minimized, whereby the speed increases during the discharge and thus the service life of the machine tool can be reduced during the discharge. The information about the maximum dimension of the respective workpiece part to be rejected is in any case present to the control unit of the machine tool, since this is necessary for the control of the separating workpiece machining.

In a preferred embodiment, the machine tool has a movement unit for the path-controlled, continuous movement of at least one of the opening delimitations. In this case, the different positions over the travel of the opening limit are continuously selectable, so that a precise adjustment of the position on the dimension of the workpiece part in the horizontal direction is made possible.

In a particularly preferred development, the movement unit has a spindle drive for the continuous movement of at least one of the opening delimitations in the direction of the opening movement. Such a spindle drive typically has a gear spindle, which is driven by an electric motor and allows both fast and precise linear movement of the opening boundaries.

In a particularly advantageous embodiment, the machine tool Furthermore, a measuring device for determining the distance traveled by the Öffungsbegrenzungen in the horizontal direction on. As a result, the traveled path can be checked and corrected if necessary.

In a further advantageous embodiment, at least one opening delimitation has a support, which is mounted so as to be pivotable downwards about an axis of rotation preferably at right angles to the direction of the opening movement. Usually, the workpiece part rests on the upper side of the support during the movement of the opening delimitations until the respective position for discharging the workpiece part has been reached. Thereafter, the support is pivoted and the workpiece part can be moved to a discharge position located below the support or the opening limit. Alternatively, however, a superimposed movement is possible in which the support is already pivoted during the movement of the opening boundaries. By providing pivotable supports on the opening delimitations, the path of movement of the opening delimitations can be reduced, since the passage opening can be widened by pivoting the supports.

In a preferred development, at least one opening delimitation has a support table, which can be displaced in a horizontal direction, on which the support is rotatably mounted. The opening limit can in this case be delivered to a position in which the workpiece part rests only on the support and not on the support table. The support is then pivoted and the workpiece part can be removed through the passage opening down. If conditions are provided at both opening delimitations, the workpiece part can be discharged by gravity action in the direction of gravity through the passage opening by synchronous pivoting of the supports, without the workpiece part in this case executing a rotary movement. If the conditions in the bearing areas at which the workpiece part is supported on its upper sides, when pivoting with an acceleration moves downwards, which is greater than that of the workpiece part, so raises the workpiece part of the pads and can in free fall to a below the To reach the discharge position.

In a particularly advantageous embodiment, the pads with a linear movement accelerated in the direction of gravity lowered, the linear movement is preferably over a distance of at most 10 mm, in particular of at most 8 mm. In this case, the lowering movement is preferably carried out with an acceleration greater than the gravitational acceleration, so that the workpiece part lifts off the supports.

In a particularly preferred embodiment, at least one opening delimitation has a support table which can be displaced in the horizontal direction, which is preferably accelerated at least at one end facing the passage opening with a linear movement in the direction of gravity, wherein the linear movement preferably over a distance of at most 10 mm, in particular of at most 8 mm. In particular, if the opening delimitations have no pivotable supports, it is advantageous to make a linear lowering movement on the support table itself. In this case, the linear movement can be effected by a parallel displacement of the support table in the direction of gravity or the support table can preferably be rotatably mounted at the end remote from the passage opening, so that in a support table, which has a sufficient length in the horizontal direction (usually more than 1000 mm, preferably more than 1500 mm) at the end facing the passage opening results in a nearly linear movement in the direction of gravity over the relatively small distance to be traveled in the vertical direction. The support table can also be mounted non-rotatably on the end remote from the passage opening and consist of a flexible material. If it is supported in this case to produce the lowering movement only at the end facing away from the passage, with a suitable choice of the elastic properties of the material, the length and weight of the support table also results in a nearly linear lowering movement at the passage opening facing the end. It is understood that in each case the storage of the support table at the end facing the passage opening can be effected by an axis controllable in the vertical direction.

In a further preferred embodiment, the opening delimitations are movable relative to each other in the horizontal direction into a closed position in which the opening delimitations completely close an opening in the workpiece support and in which preferably the supports are pivoted downwards Condition with their tops at least partially abut each other. The closing position can be assumed if the supports are to be protected or an opening in the workpiece support is to be completely closed. This may be the case, for example, if the machine tool has more than one processing station, ie if, in addition to a laser cutting station, for example, a punching station is provided. If the opening limits are attached to the laser cutting station and the laser processing is completed, the closing position is taken before the punching station takes over the machining of the workpiece part. It is understood that the assumption of a closed position of the two opening delimitations, in which an opening in the workpiece support is completely closed, can also be realized independently of the provision according to the invention of differently further passage openings.

In a further embodiment, one of the two opening delimitations is arranged stationary in the horizontal direction. As a rule, this fixed opening limitation is located at a machining position of the machine tool and serves there to support the workpiece during machining, for example when free cutting a workpiece part from a workpiece at a laser cutting station in order to prevent bending of the workpiece part during free cutting. The separating workpiece machining can be done either before or after the delivery of the opening limits at the respectively intended for discharging position.

In a particularly advantageous development, the machine tool has a fixing device for fixing the position of the workpiece part to the stationary opening boundary during the relative movement of the opening delimitations in the horizontal direction. This may be necessary if the workpiece part is displaced too far in the horizontal direction when sliding along on the upper side of the movable opening limitation, which may not be avoided even when the workpiece part is being mounted on the upper side of the opening delimitations by sliding rollers. In particular, the fixing device can be formed at a punching station, in which the stationary opening limitation serves as a counter die for a punch, by a spring arranged on the punch, for example from Eladur, which fixes the workpiece part when the punch while being moved in the horizontal direction into the counter-die.

In an advantageous embodiment, a rigid chute for discharging the workpiece part is arranged in the passage opening below the opening delimitations. The workpiece part falls in this case through the passage opening on the rigid chute and slides along this, to be discharged in this way from the machine tool.

The invention is also realized in a method of the type mentioned, in which the opening delimitations are delivered under formation differently further passage openings for discharging workpiece parts relative to each other under mutual displacement in the horizontal direction in different positions. Advantageous variants of this method are given in the claims. With regard to the advantages associated with these variants, reference is made to the above description in connection with the machine tool.

Further advantages of the invention will become apparent from the description and the drawings. Likewise, the features mentioned above and the features listed further can be used individually or in combination in any combination. The embodiments shown and described are not to be understood as exhaustive enumeration, but rather have exemplary character for the description of the invention.

Fig. 1

eine schematische Darstellung einer Ausführungsform einer erfindungsgemäßen Werkzeugmaschine,

Fign. 2a-d

schematische Darstellungen von Ablaufschritten einer Variante des erfindungsgemäßen Verfahrens zum Ausschleusen eines Werkstückteils durch eine Durchtrittsöffnung,

Fign. 3a,b

schematische Darstellungen von Teilansichten der Werkzeugmaschine von Fig. 1 mit zwei Öffnungsbegrenzungen und zwei Auflagen vor und nach dem Verschwenken,

Fig. 4a,b

schematische Darstellungen einer Bewegungseinheit und einer Führung zur Bewegung der Auflagen, und

Fig. 5

eine schematische Darstellung einer Teilansicht der Werkzeugmaschine mit den zwei Öffnungsbegrenzungen in einer Schließposition.

Show it:

Fig. 1

a schematic representation of an embodiment of a machine tool according to the invention,

FIGS. 2a-d

schematic representations of operational steps of a variant of the method according to the invention for discharging a workpiece part through a passage opening,

FIGS. 3a, b

schematic representations of partial views of the machine tool of Fig. 1 with two opening limits and two supports before and after pivoting,

Fig. 4a, b

schematic representations of a movement unit and a guide for moving the pads, and

Fig. 5

a schematic representation of a partial view of the machine tool with the two opening limits in a closed position.

Fig. 1 shows a trained as a laser punch press machine tool 1 , which has a conventional punch 3 and a laser processing head 4 as tools for processing a sheet serving as a workpiece 2 . The workpiece 2 to be machined supports during workpiece machining on a workpiece support 5 in the form of a machining table. By means of a conventional holding device 6 , which has clamps 7 for holding the workpiece 2, the workpiece 2 can be displaced relative to the stationary punch 3 and the laser processing head 4 in the X direction of the sheet plane (XY plane of an XYZ coordinate system). In the Y-direction of the sheet plane, the workpiece 2 can be moved by moving the workpiece support 5 together with the holding device 6 relative to a support 8 on which the workpiece support 5 is mounted by means of a conventional guide (not shown).

The workpiece 2 can thus be displaced in the X- and Y-direction relative to the punch 3 and the laser processing head 4, so that the respectively to be machined portion of the workpiece 2 in a stationary processing area 9 of the punch 3 or through a substantially circular suction opening 10th in the workpiece support 5 limited processing area 11 of the laser processing head 4 can be spent. The partial region of the workpiece support 5 in the X direction, on which the processing regions 9, 11 are formed, is stationary in this case and is not displaced in the Y direction relative to the support 8.

After a region of the workpiece 2 to be processed has been brought into the processing region 11 of the laser processing head 4, as shown above, the latter is activated in order to completely cut out, for example, a rectangular workpiece part 12 from the workpiece 2. After the free cutting, the workpiece part 12 rests in the plane of the sheet on two adjacent supports 13a, 13b positioned in the sheet plane in the form of flaps and on a support table 16. The first support 13a is arranged directly below the laser processing head 4 and has the processing region 11 defining suction opening 10.

To bring the workpiece part 12 out of the plane of the sheet into a discharge position (not shown) located below the sheet plane, the supports 13a, 13b can be pivoted on opposite sides 14a, 14b about two parallel axes of rotation 15a, 15b . The axes of rotation 15a, 15b are in this case arranged at a distance which is twice the width (2 b ) of the two supports 13a, 13b in the Y direction. The workpiece part 12, the dimension of which is dimensioned larger in the Y direction than this distance can be at the in Fig. 1 shown positioning of the supports 13a, 13b are not spent in the discharge position, without this rotates about its own axis, which would result in a too slow discharge of the workpiece part 12.

In order to be able to discharge the workpiece part 12 without the production of a rotational movement, the second support 13b is fastened to the support table 16 and can be moved together with it in the Y-direction, i. horizontally, to be moved in the sheet plane. This increases the distance between the two axes of rotation 15a, 15b in the Y direction and between the two supports 13a, 13b, a through opening (not shown) in the workpiece support 5 is formed. The support table 16 is displaced in this case until the workpiece part 12 rests only at its opposite ends on the upper sides of the two supports 13a, 13b and no longer on the support table 16 itself.

The process of discharging the workpiece part 12 from the in Fig. 1 shown position W1 , in which the workpiece part 12 is located in the plane of the workpiece support 5, in an underlying discharge position W2 will be described below from FIGS. 2a -d explained in more detail. In Fig. 2a the workpiece part 12 is mounted both on the upper side of the first support 13a, which forms a first opening delimitation 17a together with a stationary part of the workpiece support 5a , as well as on the upper side of the second support 13b and the support table 16, which together form a second opening delimitation 17b , The two opening delimitations 17a, 17b form two parts of a discharge device 17 for discharging the workpiece part 12.

The opening delimitations 17a, 17b are located in Fig. 2a in a position where the two pads 13a, 13b are adjacent to each other. The workpiece part 12 rests on the support table 16 and can not be discharged vertically downwards without being displaced in the sheet plane. For discharging the workpiece part 12, the second opening delimitation 17b is therefore moved in the horizontal direction along the inward direction Fig. 2a is moved by moving the support table in this direction until the second opening limit 17b with the edge of the second support 13b has reached a position A1 in which the workpiece part 12 no longer rests on the support table 16, as in FIG Fig. 2b is shown. During the movement in the horizontal direction is formed between the two supports 13a, 13b while a passage opening D1 , through which the workpiece part 12 can be discharged downward by the pads 13a, 13b are pivoted downward and thereby the passage opening D1 substantially twice the amount 2 b of the width of the pads 13 a, 13 b is extended.

The position A1 of the second opening limit 17b depends both on the position of the workpiece part 12 relative to the supports 13a, 13b and on the maximum dimension L1 of the workpiece part 12 in the horizontal direction Y. Since the position of that end of the workpiece part 12, which rests on the stationary opening delimitation 17a, corresponds to the position of the processing area 10 after the final free cutting, the discharge position A1 is essentially determined by the maximum dimension L1 of the workpiece part 12 in the horizontal direction and is selected so that that just a discharge of the workpiece part 12 by the double amount 2b of the width of the pads 13a, 13b extended passage D1 can be done.

In Fig. 2b a further position A2 of the second opening delimitation 17b is shown in dash-dotted lines, in which a further passage opening D2 is formed whose width is greater than that of the passage opening D1. A workpiece part 12 with a larger maximum dimension L2 can be discharged through the through opening D2 extended by twice the amount 2b of the width of the supports 13a, 13b. The displacement of the opening delimitations 17a, 17b is calculated as a function of the maximum dimensions L1 and L2 of the workpiece part 12 of the NC control of the machine tool 1 and the support table 16 moves controlled accordingly. It is understood that as an alternative to in Fig. 2a, b shown moving the opening delimitations 17a, 17b after the free cutting of the workpiece part 12 from the workpiece 2, the positions A1, A2 can also be taken before the workpiece part 12 cut from the workpiece 2.

To spend the workpiece part 12 in free fall through the passage opening D1 to the discharge position W2, the two supports 13a, 13b are accelerated from its horizontal position in the sheet plane out with an acceleration in the negative Z direction linearly downwards, which is three times the corresponds to the workpiece part 12 acting gravitational acceleration. By the linear movement of the supports 13a, 13b down over a distance d of about 3 mm in this case the workpiece part 12 is lifted from the supports 13a, 13b, as in Fig. 2c is shown. Subsequently, the two supports 13a, 13b pivoted about their respective axes of rotation 15a, 15b, as indicated by arrows in Fig. 2c indicated, and thereby moved into an out of the movement path 18 of the workpiece part 12 opening position, as in Fig. 2d shown. In this way, the workpiece part 12 can reach its discharge position W2 in free fall, from which the workpiece part 12 can subsequently be removed from the machine tool 1.

It is understood that as an alternative to the above-described movement of the supports 13a, 13b, which is composed of a linear movement and a pivoting, the same result can be achieved only by pivoting the supports 13a, 13b. In this case, the acceleration required to lift the workpiece part 12 off the supports 13a, 13b without sliding along the supports 13a, 13b, but from their distance from the respective ones Rotary axes 15a, 15b from. The smaller the distance of the workpiece part 12 from the axes of rotation 15a, 15b, the greater the acceleration in the pivoting must be selected.

Further alternatively to in connection with Fig. 2c-d described motion sequence, the workpiece part 12 initially on the top of the pads 13a, 13b stored by means of a linear movement by a distance of eg a few millimeters are moved to a position located below the sheet plane to avoid hooking of the workpiece part (not shown) remaining workpiece , From this lowered position out of the above movement can then be performed. It is understood that as an alternative to pivoting of the supports 13a, 13b they can be moved in other ways from the movement path 18 of the workpiece part 12, for example in a linear movement perpendicular to the direction of gravity, for example by the support table 16 is displaced in the horizontal direction, whereby also the passage opening D1 is extended.

The following is based on the FIGS. 3a , b , which respectively detail views of a lower part of the machine tool 1 of Fig. 1 show how the in FIGS. 2a, b described sequence of movements can be realized structurally. To the opening delimitations 17a, 17b to the in the in Fig. 2b To move shown position A1, the support table 16 with a in Fig. 3a shown spindle drive as a movement unit in connection, which has an electric motor 19 and a threaded spindle 20 which extends in the direction of the opening movement (Y-direction). The threaded spindle 20 and the electric motor 19 are offset below the plane of the sheet to the support table 16 in the X direction and arranged adjacent thereto. A spindle nut 21 attached to the support table 16 is guided in the threaded spindle 20 and serves for the continuous movement of the support table 16 in the horizontal direction.

The movement path of the spindle nut 21 along the Y direction is via a (in Fig. 1 shown) control unit 22 of the machine tool 1 controlled. The control unit 22 also serves to control the movement of the workpiece 2 and the punch 3 and the laser processing head 4 during execution of a The control unit 22 also serves to control the displacement of the support table 16 by the current flow through the electric motor 19 in response to the maximum dimension L1, L2 of the workpiece part 12 is controlled. By the threaded spindle 20, the Ausschleusposition A2 along the horizontal direction Y is continuously controllable.

From the in Fig. 3a shown horizontal position, the pads 13a, 13b follow in an in Fig. 3b shown, pivoted downward position to the in Fig. 2 auszuschleusen shown workpiece part 12. This is an in Fig. 4a, b shown further movement unit provided, which has a further electric motor 23 as a drive, which is coupled via a toothed belt 24 with a guided in an overload-safe bearing 25 , extending in the vertical direction threaded spindle 26 . The vertical threaded spindle 26 of the further movement unit has a further spindle nut 27 , which can be moved in and against the direction of gravity (negative Z direction). The spindle nut 27 is attached to a guide plate 28 , which in turn is guided in a longitudinal plate 29 in and against the direction of gravity linearly displaceable.

As in Fig. 4b shown, the guide plate 28 has a horizontally extending guide rail 30 , in which two connecting pieces 31a, 31b are guided linearly displaceable. The connecting pieces 31a, 31b respectively engage the supports 13a, 13b in an eccentric manner with respect to the axes of rotation 15a, 15b and are rotatably mounted thereon, while being non-rotatably guided along the guide rail 30. If the spindle nut 27 is moved by means of the drive 23 down, the guide plate 28 lowers and guided on the guide rail 30 connecting pieces 31a, 31 b are taken. During this movement, the connecting pieces 31a, 31b are displaced horizontally along the guide rail 30 due to the non-rotatable mounting. By the eccentric to the axes of rotation 15a, 15b attacking connecting pieces 31a, 31b, the pads 13a, 13b are pivoted from its horizontal position down in this movement. The guide rail 30 in this case has a length which allows the second connecting piece 31b during the movement of the second Opening limit 17b in the horizontal direction in the in Fig. 3a, b take shown position.

In addition to the pivoting movement, the linear movement in the first part of in Fig. 2c and Fig. 2d To realize the sequence of movements shown, it is necessary to move the axes of rotation 15a, 15b in or against the direction of gravity. This is achieved by moving the connecting pieces 31a, 31b further upwards than would be required for the horizontal alignment of the supports 13a, 13b. The supports 13a, 13b are in this case pressed against a (not shown) stop, which prevents pivoting of the pads 13a, 13b from the horizontal position upwards. In this case, a force is exerted on the supports 13a, 13b and thus also on the bearings of the axes of rotation 15a, 15b.

As in Fig. 3a shown, the axis of rotation 15a is rotatably mounted on a support plate 32 extending in a vertical, ie in the direction of gravity. The support plate 32 is guided on a further, also in the direction of gravity extending plate 33 of a (not shown) transverse frame and biased by applying a force against the direction of gravity by means of a stop unit 34 having a (not shown) spring unit as a shock absorber and a (not shown) Having hydraulic piston. The support plate 32 and thus the bearing of the rotation axis 15a is pressed by the force applied by the connecting pieces 31 a, 31 b against the direction of gravity force against the force acting in the direction of gravity spring or hydraulic force upwards, typically with a stroke of approx. 3-5 mm. The storage of the second edition 13b on the support table 16 is designed accordingly.

Are the connectors 31 a, 31 b in the in Fig. 4a, b In the position shown by the drive 23 moves downward due to the bias and the axes of rotation 15a, 15b move downwards synchronously so that the pads 13a, 13b move in a linear movement parallel to the sheet plane over the distance of the bias voltage. As soon as the connecting pieces 31a, 31b are moved further down, the above-described pivoting of the supports 13a, 13b directly follows the linear movement. The speed of the pivoting is in this case matched to the previous linear movement that The workpiece part after lifting can no longer hit the supports 13a, 13b. Fig. 3c shows the supports 13a, 13b after the completion of the above movement in an open position in which they have been completely pivoted and enclose an angle of approximately 80 ° with the plane of the sheet.

To a workpiece part after the in FIGS. 2c-d shown to dissipate free falling movement of the work area of the machine tool 1, a chute 35 is attached to the first connector 31 a. By the parallel displacement of the connecting piece 31a, the chute 35 is taken down and protrudes in the opening position of the supports 13a, 13b in the (not shown) movement path of the workpiece part. At the connecting piece 31 a mounted chute 35 includes in the opening position of the pads 13 a, 13 b directly to a fixed chute 36 at. A free-falling workpiece part thus meets at its discharge position either on the fixed chute 36 or on the first connector 31 a fixed, hereinafter referred to as movable chute 35 and can be removed in a sliding movement of the working area of the machine tool 1.

The movable chute 35 provided in addition to the fixed chute 36 is required to provide an in Fig. 3a shown suction tube 37 , which in the in Fig. 3a shown horizontal position of the first support 13a with the suction opening 10 of the first support 13a is in communication. The suction tube 37 is at the in Fig. 3b attached spindle nut 27 is fixed and is taken along with their displacement in the direction of gravity down. An end piece 38 of the suction tube 37 is attached to the first support 13a and is pivoted therewith, as shown in Fig. 3c. In the suction tube 37, a (not shown) beam catcher is provided at the lower end thereof to intercept the laser beam passing through the suction opening 10 in the laser mode.

At the in Fig. 1 shown machine tool 1 may follow the machining of the workpiece 2 with the laser processing head 3 at the processing position 11, a machining of the workpiece 2 at the adjacent processing position 9 of the punch 3. For this purpose, the opening delimitations 17a, 17b can be moved from the position shown in FIG. 3c into a closed position, which in FIG Fig. 5 is shown. In the closed position, the opening delimitations 17a, 17b completely close an opening in the workpiece support 5 and the supports 13a, 13b abut one another on their upper sides in their downwardly pivoted position. As a result, the supports 13a, 13b are protected from chips generated during machining of the workpiece 2 at the processing position 9 of the punch 3. A partial area 16a of the support table 16, the width of which corresponds approximately to the width 2b of the supports 13a, 13b, completely covers the area which is in Fig. 1 was taken from the pads 13a, 13b.

The movement described above can be found not only for discharging workpiece parts from the processing area 11 of the laser processing head 4, but also for discharging workpiece parts from the processing area 9 of the punch 3 use. Here, the punch 3 may additionally serve as a fixing unit for a workpiece part in the movement of the second opening limit 17b by this during the opening movement in engagement in a attached to the processing position 9 on the workpiece support 5 Gegenmatrize remains and in this case the auszuschleusende workpiece part, for. by means of a Eladurfeder against the workpiece support 5 presses.

It is understood that a discharge in the manner described above can also be advantageously carried out on other machine tools, for example on punching and bending machines, in which the workpiece parts are still bent after cutting free further processed before they are discharged from the machine tool. Also in this case, the discharging can be accelerated by the variable positions of the opening boundaries depending on the individual dimensions of the respective workpiece part auszuschleusenden and thus downtime during processing can be reduced.

Claims (16)

Machine tool (1) for the separating machining of preferably plate-like workpieces (12), in particular of metal sheets, with a workpiece support (5) and with a removal device (17) provided on the workpiece support (5) for the removal of workpiece parts created as products of the separating workpiece machining ( 12), wherein the discharge device (17) has two opening delimitations (17a, 17b) which can be delivered relative to one another in the horizontal direction (Y) with mutual displacement in order to form a passage opening for discharging workpiece parts (12),
characterized in that
the opening delimitations (17a, 17b) can be delivered to different positions (A1, A2) with the passage openings (D1, D2) of differing width being provided for discharging workpiece parts (12) relative to one another with mutual displacement in the horizontal direction. Machine tool according to Claim 1, characterized by a control unit (22) for controlling the position (A1, A2) of the opening delimitations (17a, 17b) as a function of a maximum dimension (L1, L2) in the horizontal direction (Y) of the parting machining operation created workpiece part (12). Machine tool according to claim 1 or 2, characterized by a movement unit (19, 20) for the path-controlled, continuous movement of at least one of the opening delimitations (17a, 17b) in the horizontal direction (Y). Machine tool according to Claim 3, characterized in that the movement unit (19, 20) has a spindle drive for the continuous movement of at least one of the opening delimitations (17b) in the horizontal direction (Y). having. Machine tool according to one of the preceding claims, characterized by a measuring device for determining the distance traveled by the opening delimitations (17a, 17b) in the horizontal direction (Y). Machine tool according to one of the preceding claims, characterized in that at least one opening delimitation (17a, 17b) has a support (13a, 13b), which for extending the passage opening (d1, d2) about a preferably at right angles to the horizontal direction (Y) extending axis of rotation (15a, 15b) is mounted pivotably downwards. Machine tool according to claim 6, characterized in that at least one support (13b) on a horizontal direction (Y) displaceable support table (16) is fixed, on which the support (13b) is rotatably mounted. Machine tool according to one of claims 6 or 7, characterized in that the supports (13a, 13b) with a linear movement in the direction of gravity (Z) can be lowered accelerated, wherein the linear movement is preferably over a distance of at most 10 mm, in particular of at most 8 mm , Machine tool according to one of the preceding claims, characterized in that at least one opening limit (17b) in a horizontal direction (Y) displaceable support table (16), preferably at least at one of the passage opening facing end with a linear movement in the direction of gravity (Z) accelerated lowered is, wherein the linear movement is preferably over a distance of at most 10 mm, in particular of at most 8 mm. Machine tool according to one of the preceding claims, characterized in that the opening delimitations (17a, 17b) relative to each other in the horizontal direction (Y) in a closed position (A3) are movable, in which the opening delimitations (17a, 17b) an opening in the workpiece support ( 5) completely close and preferably the supports (13a, 13b) in the downwardly pivoted state with their tops at least partially abut each other. Machine tool according to one of the preceding claims, characterized in that one of the two opening delimitations (17a) in the horizontal direction (Y) is arranged stationary. Machine tool according to claim 11, characterized in that the machine tool has a fixing device (3) for fixing the position of the workpiece part (12) to the stationary opening boundary (17a) during the relative movement of the opening delimitations (17a, 17b) in the horizontal direction (Y). Machine tool according to one of the preceding claims, characterized in that in the passage opening (D1, D2) below the opening delimitations (17a, 17b), a rigid chute (36) for discharging the workpiece part (12) is arranged. Method for discharging workpiece parts (12) produced as products of the separating workpiece machining on a machine tool (1) for separating preferably plate-like workpieces (2) by means of a discharge device (17), which has two opening delimitations (17a, 17b) has, which are supplied to form a passage opening for discharging workpiece parts (12) relative to each other in the horizontal direction (Y) with mutual displacement,
characterized in that
the opening delimitations (17a, 17b) are provided with different further passage openings (D1, D2) for discharging workpiece parts (12) relative to one another with mutual displacement in the horizontal direction into different positions (A1, A2). A method according to claim 14, characterized in that the position (A1, A2) of the opening delimitations (17a, 17b) in dependence on a maximum Dimension (L1, L2) in the horizontal direction (Y) of the part of the workpiece (12) created during the parting machining workpiece is controlled. A method according to claim 14 or 15, characterized in that at least one of the opening boundaries (17a, 17b) in the horizontal direction (Y) is steered away and continuously moved.

Images