EP2043795B1 - Stop mechanism for a bending press - Google Patents

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

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

From the document WO 03/095125 A1 is a stop device as a backgauge of a manufacturing facility for bending workpieces made of blanks, especially 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 when supplying a bending deformation to be subjected to work from a Resting position is adjusted in a limited by a fixed stop stop position. About a sensor element, the assumed stop position is monitored and released via a control signal a program sequence for the forming process.

From the document US 5,761,940 A1 A method and apparatus is known as a backgauge of a press brake for automated feeding of a workpiece to be subjected to bending forming between bending tools. According to this method and the device are on independently from each other, parallel to a bending plane predetermined by the bending tools method stop members in the direction of the bending plane projecting stop fingers, arranged on a perpendicular to a footprint of the bending press axis, pivotable angle lever, one on the stop finger a Pivoting movement causing stop force is measured by means of force measuring sensor and takes place via evaluation of the measurement result in a control and regulating device, 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 claim 1 features. The surprising advantage hereby is that at the same time as the automated configuration of the stop device, these are correspondingly predetermined Parameters for the forming process of a given part of the work an adjustment of the workpiece-dependent adjustment resistance of the stop element is done, whereby a manual conversion 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.

Due to the advantageous developments as described in claims 10 to 12, a combination of the retaining device is achieved with the mechanical adjusting device formed by the spring arrangement for the return of the stop element from a stop position to 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 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 condition monitoring of 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 embodiments shown in FIGS.

Fig. 1

eine erfindungsgemäße Anschlagvorrichtung, geschnitten gemäß den Linien I-I in Fig.2;

Fig. 2

die Anschlagvorrichtung, geschnitten gemäß den Linien II-II in Fig.1;

Fig. 3

eine andere Ausbildung der Anschlagvorrichtung in Draufsicht;

Fig. 4

die Anschlagvorrichtung, geschnitten gemäß den Linien IV-IV in Fig.3;

Fig. 5

die Anschlagvorrichtung, geschnitten gemäß den Linien V-V in Fig. 3;

Fig. 6

eine weitere Ausbildung der Anschlagvorrichtung, geschnitten.

Show it:

Fig. 1

a stop device according to the invention, cut according to the lines II in Fig.2 ;

Fig. 2

the stopper, cut according to the lines II-II in Fig.1 ;

Fig. 3

another embodiment of the stop device in plan view;

Fig. 4

the stopper, cut according to the lines IV-IV in Figure 3 ;

Fig. 5

the stopper, cut according to the lines VV in Fig. 3 ;

Fig. 6

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 information selected in the description, such as above, below, laterally, etc. related to the immediately described and illustrated figure and are to be transferred to a new position in a change in position. Furthermore, individual features or combinations of features from the various exemplary embodiments shown and described can also represent separate, inventive or erfmdungsgemäße solutions.

In the Fig. 1 and 2 is a 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 6, shown in a press brake, not shown.

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

Thus, the stop device 1 can be adjusted according to a placement of the table beam 2 and bending beam 3 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 different bending operation.

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. Thus, the end face 23 is exactly aligned in a plane parallel to the bending plane 8 stop plane 24 to perform the bending deformation on the workpiece 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 can be acted upon by electrical energy from a power source 32 magnetic coil 33 with a bolt-shaped coil armature core 34 which extends through the solenoid coil 33 in a bore 36 with a cylindrical pin 37 and 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 a support flange 40 on which, as soon as a magnetic field is applied to an end face 41 of the magnetic coil 33 and thus in dependence of a magnetic field strength 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 cylinder pin 37 superior annular surface a support the coil armature core 34 on the end face 41 of the solenoid coil 33 is reached and thus defines a displacement of the stop element 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 armature 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 the workpiece 6 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 as a function of the workpiece 6 and thus an intended Abkanthöhe a different order of 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 the linear guide 12 has a structurally predetermined dimension, the linear guide 12, on which the Anschlagtragschlitten 13 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 portion 48 and the stop carrier 14 form this fixed stop 47, which in this embodiment shown, in contrast to the previously described embodiment with the fixed stop 19, is not adjustable.

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 Move bending plane 8 against the end stop, for example, only one sensor element 27 is a signal to the control device of the press brake and a correction of the position by a rotary movement of the gripper head until a signal of 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.

In the Fig. 3 to 5 a further embodiment of the stop device 1 according to the invention is shown. 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, the stop element 15 is in the guide arrangement 16, which is provided, for example, by a linear guide element 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, the adjustability is achieved by mounting the guide arrangement 16 or the guide element 59 in a pivot bearing arrangement 60 on 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, formed by the compression spring 20 spring assembly 21, through which the stop member 15 is positioned in the rest position, and which causes a first adjustment, to increase the demand resistance as needed already described to the preceding figures retaining means 31, with the solenoid coil 33 and the coil armature core 34, is provided.

For the pivoting movement, a spring arrangement 63 is likewise provided in addition to a compression spring 20, for example in conjunction with a stop means, as a retaining means 64 which increases the adjustment resistance as needed.

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 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 embodiment, this retainer 64, in tandem design, can be used with two parallel thrust pins 67 and one compression spring 66, respectively, 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.

In the Fig. 6 a further embodiment of the stop device 1 is shown in which the retaining device 31, for example, by a pressure medium, eg compressed air, pressure oil, etc. preferably via a pressure control member 70 with variable pressure from a supply line 71 acted upon actuator 72, in the illustrated embodiment by a pressure cylinder formed is. The pressure cylinder is secured to the stop carrier 14 in the direction of adjustment 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. If necessary, in particular with a larger support weight of the workpiece 6 is to counteract premature, friction-induced adjustment of the stop element 14 counteracting in the printing cylinder by supplying the pressure medium, a pressure which is controlled by the control means 70 as required.

All statements on ranges of values in the description of the present invention should be understood to include any and all sub-ranges thereof, e.g. the indication 1 to 10 should be understood to include all sub-ranges, starting from the lower limit 1 and the upper limit 10, i. all subregions begin with a lower limit of 1 or greater and end at an upper limit of 10 or less, e.g. 1 to 1.7, or 3.2 to 8.1 or 5.5 to 10.

The exemplary 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 thereof, but also various combinations of the individual embodiments are mutually possible and this variation possibility due to the teaching of technical action by representational invention in the knowledge of the person working in this technical field.

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

REFERENCE NUMBERS

1

stop device

2

bench beam

3

bending beam

4

bending tool

5

bending tool

6

work part

7

arrow

8th

bending plane

9

Press room

10

Dopperlpfeil

11

12

linear guide

13

Stop supporting slide

14

stop support

15

stop element

16

guide assembly

17

double arrow

18

slings

19

slings

20

compression spring

21

spring assembly

22

contact surface

23

face

24

stop plane

25

contact surface

26

bearing surface

27

sensing element

28

face

29

face

30

base

31

Restraint

32

energy

33

solenoid

34

Coil armature core

35

36

drilling

37

straight pin

38

printhead

39

The End

40

support flange

41

face

42

arrow

43

distance

44

distance

45

Longitudinal central axis

46

47

fixed stop

48

finger area

49

width

50

width

51

face

52

face

53

actuating means

54

double finger

55

finger

56

Lateral side edge

57

Longitudinal side edge

58

finger

59

guide element

60

Pivot bearing arrangement

61

swivel axis

62

fixed stop

63

spring assembly

64

Retention means

65

swivel base

66

compression spring

67

pushpin

68

screw

69

70

Pressure-regulating element

71

supply line

72

actuating means

73

piston rod

74

adjusting nut

75

compression spring

Claims (23)

1. Automatic stop device (1) which can be positioned by means of a control and regulating device of a bending press, in particular an edging press, for positioning a workpiece to be shaped by a bending deformation between bending tools (4, 5) arranged opposite one another in a table bar (2) and a bending bar (3) adjustable relative thereto, with a stop support slide (13) and with a stop support (14) on the stop support slide (13) projecting in a direction substantially perpendicular to a bending plane (8) formed by the bending tools (4, 5) and a stop element (15) which 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 therefrom against the action of the spring arrangement (21) and forms a finger section (48) and with at least one sensor element (27) detecting the stop position of the stop element (15), e.g. a proximity sensor, and a switchable and controllable retaining device (31) is provided, which opposes an increased adjusting resistance of a stop movement of the stop element (15) in the stop position, characterised in that the retaining device is connected to the control and regulating device.
2. Stop device (1) as claimed in claim 1, characterised in that the retaining device (31) is arranged on the stop support (14).
3. Stop device (1) as claimed in claim 1, characterised in that the retaining device (31) is arranged on the stop element (15).
4. Stop device (1) as claimed in one of the preceding claims, characterised in that the guiding arrangement (16) for the stop element (15) is mounted pivotably on the stop support (14) preferably by means of a pivot bearing arrangement (60) and comprises the retaining device (31).
5. Stop device (1) as claimed in one of the preceding claims, characterised in that a guiding element (59) of the guiding arrangement (16) and the retaining device (31) are arranged on a pivot base (65) of the pivot bearing arrangement (60).
6. Stop device (1) as claimed in one of the preceding claims, characterised in that a pivot axis (61) of the pivot bearing arrangement (60) runs parallel with the bending plane (8) and perpendicular to a bearing surface (26) of the stop element (15).
7. Stop device (1) as claimed in one of the preceding claims, characterised in that the retaining device (31) is formed by a magnet coil (33) which can be exposed to electrical energy from an energy source, and a bolt-like coil armature core (34) acting on the stop element (15) against the stop movement.
8. Stop device (1) as claimed in one of the preceding claims, characterised in that the strength of the magnetic field generated by the magnet coil (33) can be controlled.
9. Stop device (1) as claimed in one of the preceding claims, characterised in that the magnet coil (33) can be positioned in a bearing means in a direction running parallel with an adjustment direction of the stop element (15).
10. Stop device (1) as claimed in one of the preceding claims, characterised in that a compression spring (20) of the spring arrangement (21) is arranged pre-stressed in a direction opposite to the stop movement between a pressure head (38) of the coil armature core (34) and the magnet coil (33) facing a bearing surface (25) on the stop element (15).
11. Stop device (1) as claimed in one of the preceding claims, characterised in that the coil armature core (34) is provided at one end opposite the pressure head (38) with a support flange (40) supported on an end face (41) of the magnet coil (33) opposite the action of the compression spring (20).
12. Stop device (1) as claimed in one of the preceding claims, characterised in that the support flange (40) is secured adjustably in the direction of the length of the coil armature core (34) on the latter.
13. Stop device as claimed in one of the preceding claims, characterised in that the retaining device (31) is formed by an adjusting means (72) supplied with a pressure medium e.g. compressed air, pressure oil etc., e.g. pressure cylinder, traction cylinder etc.
14. Stop device (1) as claimed in one of the preceding claims, characterised in that a finger section (48) of the stop element (15) facing the bending plane (8) is designed in the form of a double finger (54).
15. Stop device (1) as claimed in one of the preceding claims, characterised in that the double finger (54) forms two stop planes running at right angles to one another, one stop plane being aligned parallel with the bending plane (8).
16. Stop device (1) as claimed in one of the preceding claims, characterised in that an adjustable stop means is provided on the stop support (14) and restricts the pivoting movement of the stop element (15) into a stop position.
17. Stop device (1) as claimed in one of the preceding claims, characterised in that acting against the pivot movement, the stop means is provided with an adjusting means that is pre-tensioned by the compression spring (21).
18. Stop device (1) as claimed in one of the preceding claims, characterised in that acting against the pivot movement in addition to the stop means, at least one retaining means (64) is arranged on the stop support (15) or the pivot base (65).
19. Stop device (1) as claimed in one of the preceding claims, characterised in that the retaining means (64) is formed by a pressure bolt (67) guided linearly in a housing and pre-tensioned by a compression spring (66).
20. Stop device (1) as claimed in one of the preceding claims, characterised in that a spring force of the compression spring (66) is adjustable.
21. Stop device (1) as claimed in one of the preceding claims, characterised in that on the stop support (14) or the stop element (15), a guiding element (27), e.g. a proximity sensor, detecting the stop position of the pivoting movement is arranged.
22. Stop device (1) as claimed in one of the preceding claims, characterised in that between the stop support (14) and the stop element (15) or the pivot base, preferably adjustable fixed stops (62) are arranged for restricting the pivoting movement into a position of rest and a stop position.
23. Stop device (1) as claimed in one of the preceding claims, characterised in that the guiding arrangement (16) is provided with stop means (18, 19) restricting in an adjustable manner the adjustment path of the stop element (15).

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