EP2043795A1

EP2043795A1 - Stop mechanism for a bending press

Info

Publication number: EP2043795A1
Application number: EP07784589A
Authority: EP
Inventors: Alois Austaller
Original assignee: Trumpf Maschinen Austria GmbH and Co KG
Current assignee: Trumpf Maschinen Austria GmbH and Co KG
Priority date: 2006-07-25
Filing date: 2007-07-24
Publication date: 2009-04-08
Anticipated expiration: 2027-07-24
Also published as: AT503790A4; PL2043795T3; WO2008011648A1; US8683835B2; DE502007006846D1; AT503790B1; EP2043795B1; US20110048088A1; ATE503597T1

Abstract

The invention describes an automatic stop device (1), that can be positioned by means of a control and regulating device of a bending press, in particular an edging press, for positioning a workpiece (6) to be shaped by bending deformation between bending tools (4, 5) arranged opposite one another in a table bar (2) and a bending bar (3) adjustable in relation to the latter. It comprises a stop support slide (13) and a stop support (14) on the latter projecting substantially in perpendicular direction to a bending plane (8) formed by the bending tools (4, 5) and a stop element (15) which forms a finger section and is adjustable in a guiding arrangement (16) running perpendicular to the bending plane (8) relative to the stop support (14) between a position of rest facing the bending plane (8) and a stop position spaced apart from the latter against the effect of a spring arrangement (21). A controllable, switchable retaining device (31) is provided in order to oppose an increased adjusting resistance in the case of a stop movement of the stop element (15).

Description

Stop device for a bending press

The invention relates to a stop device, as described in the preamble of claim 1.

From the document WO 03/095125 Al a stop device as a backgauge of a manufacturing facility for bending workpieces made of blanks, in particular sheet metal blanks, known in a finger carrier a linear in a direction perpendicular to a bending plane adjustable stop finger superimposed, which against the action of a spring assembly during feeding one of the bending deformation to be subjected to work part from a rest position is adjusted in a limited by a fixed stop stop position. About a sensor element, the occupied stop position is monitored and released via a control signal a program flow for the forming process.

From the document US Pat. No. 5,761,940 A1 a method and a device is known as a backgauge of a press brake for an automated feeding of a workpiece to be subjected to a bending deformation between bending tools. In accordance with this method and the device, stop fingers projecting in the direction of the bending plane are arranged independently of one another on a bending plane predetermined by the bending tools, on a pivotable angle lever on an axis running perpendicularly to a contact surface of the bending press, one on the Stop finger pivotal movement causing stop force by means of force measuring sensor is measured and carried out by evaluating the measurement result in a control and regulating an end position of the workpiece with respect to the bending plane.

The object of the invention is to provide a stop device for a bending press, in particular a press brake, for positioning a workpiece to be reshaped between bending tools, in which an adjusting resistance of a stop element can be changed as a function of the part parameters.

This object of the invention is achieved by the reproduced in the characterizing part of claim 1 features. The surprising advantage of this is that, simultaneously with the automated configuration of the stop device, this accordingly precedes Bener parameters for the forming process of a given part of the workpiece adjustment of the workpiece-dependent adjustment resistance of the stop element takes place, whereby a manual tool change process saved and a faulty manipulation is effectively avoided.

Advantageous are embodiments according to claims 2 and 3, whereby embodiments are achieved.

Further advantageous embodiments describe the claims 4 to 6, whereby a positioning of the work piece to be formed on end stop in two spatial directions with high accuracy for a high quality forming is achieved.

Of advantage are the embodiments according to claims 7 and 8, whereby a high degree of automation and thus a reduction of a conversion effort is achieved.

The advantageous development described in claim 9, an additional adjustment option is achieved on the occasion of a first commissioning.

As a result of the advantageous further developments as described in claims 10 to 12, a combination of the retaining device with the mechanical actuating device formed by the spring arrangement is achieved for the return of the stop element from a stop position into a rest position.

But also advantageous is an embodiment according to claim 13, whereby a very small structure for the stop device is achieved.

The advantageous developments according to claims 14 and 15 simplify the design of the stop element and is thereby achieved an exact positioning of the workpiece for the forming process.

According to the embodiments described in claims 16 to 20 is a fine adjustment of the rest and stop positions, both the linear adjustment of the stop element, as well as the pivoting adjustment, by a single fine positioning at initial start-up possible, as well as in addition a pivoting movement, an increased resistance is to be set by at least one retaining means to prevent unintentional pivoting movement.

According to the advantageous development, as described in claim 21, a state monitoring the pivot position is achieved.

Finally, the embodiments according to claims 22 and 23 are advantageous, whereby an exact limitation of all end positions achieved and a final adjustment is ensured by making a fine adjustment.

For a better understanding of the invention, this will be explained in more detail with reference to the exemplary embodiments shown in FIGS.

Show it:

1 shows a stop device according to the invention, cut according to the lines I-I in Figure 2;

FIG. 2 shows the stop device, cut along the lines H-II in FIG. 1; FIG.

3 shows another embodiment of the stop device in plan view;

4 shows the stop device, cut along the lines IV-IV in Figure 3;

5 shows the stop device, cut along the lines V-V in Fig. 3.

Fig. 6 shows a further embodiment of the stop device, cut.

By way of introduction, it should be noted that in the differently described embodiments, the same parts are provided with the same reference numerals or the same component names, wherein the disclosures contained in the entire description can be mutatis mutandis to the same parts with the same reference numerals or component names. Also, the location details selected in the description, such as th, laterally, etc. related to the immediately described and illustrated figure and are to be transferred to a new position in a position change accordingly. Furthermore, individual features or combinations of features from the various exemplary embodiments shown and described may also represent separate solutions in their own right, according to the invention or in accordance with the invention.

1 and 2 is an abutment device 1 for positioning a, by a bending deformation between each other, in a table beam 2 and a relative to this adjustable bending beam 3 arranged bending tools 4, 5 to be reshaped workpiece 6, in a not further shown Press brake, shown.

The stop device 1 forms a so-called backgauge which, in the direction of insertion of the workpiece 6 - according to arrow 7 - is adjustable behind a bending plane 8 determined by the position of the bending tools 4, 5 in a press room 9, preferably in three spatial directions - double arrow 10 is arranged.

Thus, the stopper 1 can be adjusted according to a placement of the table beam 2 and 3 bending beam in the required position with not shown for the adjustment drive devices and control means are provided and the positioning is often done automatically over program flow for each j eden different bending process.

The stop device 1 consists of a movable on a linear guide 12 Anschlagtragschlitten 13 on which a stop support 14 is mounted protruding ausragend in the direction of the bending plane 8 and in a linear guide assembly 15, a stop member 16 in a plane perpendicular to the bending plane 8 - according to double arrow 17th - Between one, limited by a stop means 18 front rest position and adjustable by a stop means 19 limited rear stop position stores.

In the illustrated embodiment, the stop member 15 after inserting the workpiece 6 against the action of a spring assembly formed by a compression spring 21, in its stop position to stop the stop means 19, which forms an adjustable fixed stop. The workpiece 6 is pressed during the insertion process against a contact surface 22 of the stop element 15 with an end face 23 until the stop position is reached. The end face 23 is thus aligned exactly in a stop plane 24 running parallel to the bending plane 8 in order to execute the bending deformation on the work piece 6 exactly parallel to the end face 23.

One of the bending plane 8 facing end portion 25 of the stop element 15 is stepped stepped, whereby a perpendicular to the bending plane 8 aligned bearing surface 26 is formed on the stop element 15. For this purpose, extending at right angles another, the bending plane 8 closer contact surface 25 is formed for a striking of the workpiece 6, which is used when the end face 23, the bending tool 4 only slightly surmounted.

The stop carrier 14 has in a recess formed between the guide assemblies 16 a sensing element 27, e.g. a proximity sensor, which faces an end face 28 of an end face 29 of a base part 30 of the stop element 15 and is adjusted so that the assumed stop position of the stop element 15 is detected. Preferably, the sensor element 27 in the direction of adjustability according to - double arrow 15 - of the stop element 15 on the stop carrier 14 adjustably attached.

Further, in the recess, a retaining device 31, consisting of a solenoid 33, which can be acted upon by an energy source 32 with electrical energy, is arranged with a bolt-shaped coil armature core 34, which projects through the magnet coil 33 in a bore 36 with a cylindrical pin 37 and with one, the base part 30 of the stop element 15 has a cooperating with the end face 29 printhead 38. Between the print head 38 and the solenoid 33, the cylinder pin 37 is surrounded by the biased compression spring 20, whereby the stopper member 15 in the idle state in a forward, i. the bending plane 8 facing rest position is positioned.

The cylindrical pin 37 has at a the print head 38 opposite end 39 has a support flange 40 on which, as soon as a magnetic field is applied to an end face 41 of the solenoid coil 33 and thus in dependence of a magnetic field strength a variable resistance movement of the coil armature core 34 and so that a movement of the stop element 15 sets against.

Also, with an annular, the cylindrical pin 37 superior annular surface a Abstüt- tion of the coil armature core 34 on the end face 41 of the solenoid coil 33 and thus determines an adjustment of the stop member 15 on the fixed front end position due to the action of the compression spring 20 in addition to the stop means 18.

The retainer 31 formed by the solenoid coil 33 and the coil anchors 37 can now on the one hand, a stop movement of the stop element - according to arrow 42 - opposing resistance by the biasing force of the compression spring 20 and additionally if necessary by applying the solenoid coil 33 with power from the power source 32 are regulated, the magnetic field strength is regulated by changing the current or the voltage.

This is in response to one of the nature of the workpiece 6 on the Abtreppung of the stop element 15, when supplying the workpiece 6, acting friction force adapted resistance of an adjustment of the stop element 15 - opposite arrow 42 - and thus an adjustment of the stop element 15, before it to a plant of

Workpiece 6 comes with its end face 23 on the contact surface 22, even with a heavy work piece 6 or at a high coefficient of friction due to a rough surface of the workpiece, effectively prevented. However, if light workpieces, or workpieces with lubricious surfaces in particular thin, bare sheets subjected to a bending process, can be dispensed with the effect of the retainer.

The abutment device described is used as a so-called "fixed stop" for aligning the end face 23 of the workpiece 6 in accordance with an "X-axis" application wherein the stop element 15 is adjusted in the stop position against the stop means, in which a provided distance 43 of Bending plane 8 is reached by the stop plane 24. This is monitored by the sensor element 27 on the detection of the reached stop position of the stop element 15, a control signal to a control device of the press brake to initiate the forming process by driving drive means of the press brake is started.

Since the distance 43 in dependence of the workpiece 6 and thus an intended Abkanthöhe has a different magnitude, on the other hand, a distance 44 between the stop plane in the retracted state of the stop element 15 and a longitudinal center Axis of the linear guide 12 has a structurally predetermined amount, the linear guide 12, the stop carrier sledge 13 is adjustable - according to double arrow 10 - is arranged in the direction perpendicular to the bending plane 8 direction - according to arrow 10th

Also, a further embodiment of a fixed stop 47 between the stop element 15 and the stop carrier 14 is shown in broken lines, which is formed by a finger portion 48 of the stop member 15 has a greater width 49 than a width 50 of the stop carrier 14, whereby opposite end faces 51, 52 of the finger region 48 and the stop carrier 14 form this fixed stop 47, which is not adjustable in this gezeig- shown embodiment, in contrast to the previously described embodiment with the fixed stop 19.

It should also be mentioned that the abutment device 1 described above is used in pairs for workpieces 6 with a larger expansion on the press brake, in order to achieve a greater span between the abutment elements 15. In such an arrangement, the sensor elements 27 of mutually parallel stop devices 1 for a final adjustment of the workpiece 6, for example on a gripper head handling axis for positioning the end face 23 of the workpiece 6 are exactly parallel to the bending plane 8 is the end face 23 in an inclined position to If the bending plane 8 moves in relation to the end stop, for example, only one sensor element 27 sends a signal to the control device of the press brake and the position is corrected by a rotary movement of the gripper head until a signal from the sensor element 27 of the further stop device 1 takes place. If this state is reached, the delivery is in the direction of the "X-axis" to end stop.

FIGS. 3 to 5 show a further embodiment of the stop device 1 according to the invention. The stop device 1 is for the positioning of the workpiece 3 in two mutually perpendicular directions in space, as they are commonly referred to as "X-axis" and "Z-axis" provided. For this purpose, the finger region 48 of the stop element 15 is designed as a double finger 54. This allows abutment of the workpiece 6 on a projecting finger 55 with a transverse edge 56 and with a longitudinal edge edge 57 on another finger 58 with the fingers 55, 58 in a fixed dimensional relationship to each other. For both spatial directions there is an independent adjustability of the stop element 15 from the rest position into the stop position. In the direction of the X-axis is the stop element

15 in the guide assembly 16, for example, by a linear guide member 59, e.g. Flat track, Gleitführungs-, Rundstangenführungs- or recirculating ball guide element, etc. is formed, adjustable substantially in the plane perpendicular to the bending plane 8 direction. In the direction of the Z-axis is the adjustability by a bearing of the guide assembly

16 and the guide member 59 in a pivot bearing assembly 60 reaches the stop carrier 14. A pivot axis 61 of the pivot bearing assembly 60 extends parallel to the bending plane 8 and perpendicular to the support surface 26 for the workpiece 6 in the finger region 48 of the stop element 15th

In both spatial directions, the abutment position is predetermined by fixed stops 62 which can be adjusted, for example by limiting a guide length of the guide arrangement 16 or adjustable, e.g. can be formed by means of screws.

As already described in the preceding examples, the stop positions, both the linear adjustment and the pivoting adjustment by feeler elements 27, e.g. Proximity sensors, monitors and form reference values for the position of the workpiece 6, which are stored in the control and monitoring device of the press brake or a data memory.

For the linear adjustment, in addition to the spring arrangement 21 formed by the compression spring 20, by which the stop element 15 is positioned in the rest position, and which effects a first adjustment resistance, the retention device 31 already described with reference to FIGS with the solenoid 33 and the coil armature core 34 provided.

For the pivoting movement is also in addition to a compression spring 20, for example, in conjunction with a stop means a spring assembly 63 as the adjustment resistance as required increasing retention device 64 is provided.

This consists of a, on the pivotable guide assembly 16 and a guide member 59 having pivot base 65, spring-loaded by a compression spring 66 an acting pressure pin 67, wherein the spring force of the compression spring 66 is adjustable by means of a set screw 68.

According to a further exemplary embodiment, this retainer 64, in tandem execution, can be used with two parallel pressure bolts 67 and one compression spring 66 in each case, whereby a multi-stage adjustment of the adjustment resistance is achieved, e.g. Three-stage when different strong compression springs are used.

It is also pointed out that this described stop device 1, with the stop possibility in two spatial directions, preferably in pairs for positioning of the workpiece 6 on a bending press used and that the positioning of the stop device is preferably automated. In a pairwise use, an alignment of the work piece 6 in the so-called Z axis is usually carried out only on one of the stop devices 1, both being used in the X axis and, with the measurement results of the sensor elements 27, an exact alignment of the work piece 6 with respect to a predetermined one

Bending line, which also does not necessarily have to run parallel to the bending plane 8, is achieved.

FIG. 6 shows a further embodiment of the stop device 1, in which the restraining device 31 is actuated, for example, by a pressurizing medium, eg compressed air, pressurized oil, etc., preferably via a pressure regulating member 70 with variable pressure from a supply line 71 embodiment shown by a pressure cylinder is formed. The impression cylinder is fastened to the stop carrier 14 in the direction of action of the stop element 15 in parallel aligned direction of action and preferably has a continuous piston rod 73 on which the stop element 15 facing the print head 38 is provided. In the protruding further end region, the piston rod 73 is provided with an adjusting nut 74 for the purpose of limiting the stroke. By arranging a piston rod 73 comprehensive compression spring 75 between the print head 38 and an end face of the cylinder jacket of the impression cylinder an adjustment of the stop member 15 counteracting preload is achieved depending on the spring dimensioning. Required wise, especially for a larger support weight of the workpiece 6 is to counteract premature, friction-induced adjustment of the stop member 14 counteracting in the printing cylinder by supplying the pressure medium, a pressure which is adjustable as needed by means of the control member 70. All statements on ranges of values in objective description are to be understood as including any and all sub-ranges thereof, eg the indication 1 to 10 should be understood to include all sub-ranges, starting from the lower limit 1 and the upper limit 10 ie, all sub-regions begin with a lower limit of 1 or greater and end at an upper limit of 10 or less, eg, 1 to 1.7, or 3.2 to 8.1, or 5.5 to 10.

The embodiments show possible embodiments of the stop device wherein it should be noted at this point that the invention is not limited to the specifically illustrated embodiments of the same variants, but rather also various combinations of the individual embodiments are possible with each other and this possibility of variation due to the teaching of technical action representational invention in the skill of those skilled in this technical field. Thus, all conceivable embodiments that are possible by combinations of individual details of the illustrated and described embodiment variant are also included in the scope of protection.

For the sake of order, it should finally be pointed out that, for a better understanding of the structure of the stop device, these or their components have been shown partially unevenly and / or enlarged and / or reduced in size.

The problem underlying the independent inventive solutions can be taken from the description.

Above all, the individual in Figs. 1, 2; 3, 4; FIGS. 5 and 6 form the subject of independent solutions according to the invention. The relevant objects and solutions according to the invention can be found in the detailed descriptions of these figures. Reference design

1 stop device 41 end face

2 table beams 42 arrow

3 bending beam 43 distance

4 bending tool 44 distance

5 bending tool 45 longitudinal central axis

6 Workpiece 46

7 arrow 47 Fixed stop

8 bending plane 48 finger area

9 press room 49 width

10 Dopper arrow 50 width

11 51 face

12 linear guide 52 face

13 stop carriages 53 adjusting means

14 stop carrier 54 double finger

15 stop element 55 fingers

16 guide arrangement 56 transverse edge

17 Double arrow 57 Longitudinal edge

18 slings 58 fingers

19 stop means 59 guide element

20 compression spring 60 pivot bearing assembly

21 Spring arrangement 61 pivot axis

22 contact surface 62 fixed stop

23 end face 63 spring arrangement

24 stop level 64 retention means

25 contact surface 65 swivel base

26 bearing surface 66 compression spring

27 Sensor element 67 Pressure pin

28 Face 68 Adjusting screw

29 end face 69

30 base part 70 pressure regulator

31 Retaining device 71 Supply line

32 Energy source 72 Adjusting agent

33 solenoid coil 73 piston rod

34 Coil armature 74 Adjusting nut

35 75 Compression spring

36 bore

37 cylinder pin

38 printhead

39 end

40 support flange

Claims

Claim for patent

1. Automatic, via a control and regulating device of a bending press, in particular press brake, positionable stop device (1) for positioning a, by a bending deformation between each other in a table bar (2) and a relative to this adjustable bending beam (3) arranged bending tools ( 4, 5) to be reshaped workpiece, with a Anschlagtragschlitten (13) and with a on the Anschlagtragschlitten (13) in a by the bending tools (4, 5) formed bending plane (8) substantially perpendicular direction projecting stop carrier (14) and a in a guide arrangement (16) extending perpendicular to the bending plane (8) relative to the stop carrier (14) between a rest position facing the bending plane (8) and a stop position spaced therefrom against the action of a spring arrangement (21) and forming a finger region (48) ( 15) and with at least one stop position of the stop element (15) dete sensing element (27), e.g. Proximity sensor, characterized in that an abutment movement of the stop element (15) into the stop position is provided with an increased resistance against setting, with the control and regulating device line connected, connectable and controllable retaining device (31).

2. stop device (1) according to claim 1, characterized in that the Rückharteeinrichtung (31) on the stop carrier (14) is arranged.

3. stop device (1) according to claim 1, characterized in that the retaining means (31) on the stop element (15) is arranged.

4. stop device (1) according to one of the preceding claims, characterized in that the guide arrangement (16) for the stop element (15) on the stop carrier (14) preferably via a pivot bearing assembly (60) is pivotally mounted and the retaining means (31).

5. stop device (1) according to one of the preceding claims, characterized in that a guide element (59) of the guide assembly (16) and the retaining means (31) on a pivot base (65) of the pivot bearing assembly (60) are arranged.

6. stop device (1) according to one of the preceding claims, characterized in that a pivot axis (61) of the pivot bearing assembly (60) parallel to the bending plane (8) and perpendicular to a support surface (26) of the stop element (15).

7. stop device (1) according to any one of the preceding claims, characterized in that the retaining means (31) acted upon by an electric energy from a power source solenoid (33) and a stop element (15) against the stop movement acting bolt-shaped coil armature core (31). 34) is formed.

8. stop device (1) according to one of the preceding claims, characterized in that one of the magnetic coil (33) generated magnetic field strength is adjustable.

9. stop device (1) according to any one of the preceding claims, characterized in that the magnetic coil (33) in a bearing means in a direction of adjustment of the stop element (15) parallel direction can be positioned.

10. stop device (1) according to one of the preceding claims, characterized in that a compression spring (20) of the spring assembly (21) biased in the stop movement opposite direction biased between a contact surface (25) on the stop element (15) facing printhead ( 38) of the coil armature core (34) and the magnetic coil (33) is arranged.

11. stop device (1) according to any one of the preceding claims, characterized in that the coil armature core (34) at one of the printhead (38) opposite end with a on an end face (41) of the magnetic coil (33) against the Effect of the compression spring (20) supporting support flange (40) is provided.

12. stop device (1) according to any one of the preceding claims, characterized in that the support flange (40) in the direction of a length of the coil-armature core (34) adjustably mounted thereon.

13. A stop device according to one of the preceding claims, characterized in that the Rücklαalteeinrichtung (31) by a with a pressure medium, for example, pressure air, pressure oil, etc. Actuated adjusting means (72), eg pressure cylinder, pull cylinder, etc., is formed.

14. stop device (1) according to any one of the preceding claims, characterized in that one of the bending plane (8) facing the finger region (48) of the stop element

(15) is designed as a double finger (54).

15. stop device (1) according to any one of the preceding claims, characterized in that the double finger (54) two mutually perpendicular stop planes forms of which a stop plane is aligned parallel to the bending plane (8).

16. stop device (1) according to one of the preceding claims, characterized in that a pivoting movement of the stop element (15) in stop position limiting an adjustable stop means on the stop carrier (14) is arranged.

17 stop device (1) according to one of the preceding claims, characterized in that the pivoting movement counteracting the stop means is provided with a biased by the compression spring (21) actuating means.

18 stop device (1) according to one of the preceding claims, characterized in that the pivoting movement counteracting in addition to the stop means at least one retaining means (64) on the stop carrier (15) or the pivot base (65) is arranged.

19. stop device (1) according to any one of the preceding claims, characterized in that the retaining means (64) by a linearly guided in a housing and via a compression spring (66) biased pressure pin (67) is formed.

20. stop device (1) according to any one of the preceding claims, characterized in that a spring force of the Duck spring (66) is adjustable.

21 stop device (1) according to one of the preceding claims, characterized in that the stop carrier (14) or the stop element (15) has a stop position the pivoting movement delektierendes guide element (27), eg proximity sensor is arranged.

22. stop device (1) according to any one of the preceding claims, characterized in that between the stop carrier (14) and the stop element (15) or the

Swivel base, preferably adjustable, fixed stops (62) are arranged to limit the pivoting movement in rest position and stop position.

23 stop device (1) according to any one of the preceding claims, characterized in that the guide arrangement (16) with the travel of the stop element (15) adjustable limit stop means (18, 19) is provided.