EP1543892A1 - Machine for bending bars, in particular tubes - Google Patents

Abstract

The machine has a length holder, a bending stand moving on a machine bed (1), with a support plate (5) for a bending head (6), and drives for stand, plate, and bending head. The drive units are located stationary on the machine bed. Profiled shafts (15,16) are mounted on the bed along a movement path (8) of the bending stand to transmit the drive movement from the stationary units to the stand. The drive units are electric motors, and drive force is transmitted via the profiled shafts to toothed gears (17,18), toothed belts (20,21), chains, etc. to the support plate and the bending head.

Description

The invention relates to a bending machine according to the preamble of claim 1.

They are bending machines for bending strands, in particular tubular ones Strands with relatively small outside diameters of about 15 mm and smaller known. These bending machines work without bending mandrels and are equipped with one or more Provided bending stand. The bending head is pivotable on a vertically arranged 360 ° Attached washer and has a radial slot for insertion of the bending strand on. This pivotable arrangement of the bending head allows a Bend in all directions.

From DE-GM 295 01 141 U1 a device for bending pipes is known, the Having a bending stand with a rotatably mounted, drivable support disk. The support disc is equipped with a segment-like radial slot for inserting unbent Provided pipes. On the support disc is a bending head with a drivable Bending arm attached. A stationarily arranged on the bending stand motor drives chains Both the support disc and the bending arm on the bending head. For optional switching the drive movement of the support disk on the bending head and vice versa is a lock that interacts with a brake, necessary. This common Drive for the pivoting movement of the support disc and for the movement of the bending arm requires a variety of deflections of the drive movement with pinions and flexible traction means such as chains and corresponding devices for braking and Locking the support disk movement. In addition, this common drive prevents a rapid sequence of the necessary for a bending operation Tragscheiben- and Biegearmbewegung, because between these two movements a blocking of the Support plate is required. Only after completed blocking a movement of the Biegearmes be initiated. Such bending machines therefore work accordingly slow and because of the many deflections of the long flexible traction means little precise. In addition, she needs a lot of maintenance.

From DE-PS 36 35 169, which forms the preamble of claim 1, is a bending machine for bending tubular strands known as a machine bed as Foundation plate for a strand holding device and one on the machine bed having displaceable bending stand. The bending stand is rotatable with a 360 ° Support disc and attached to the support disc bending head provided. One The first electric motor for the displacement of the bending stand is on the machine bed arranged. This electric motor generated by the displacement of the bending stand the Strand advancing. A second electric motor is arranged on the displaceable bending stand and generates the rotational movement of the support disc by 360 ° together with the Bending head. A third electric motor is connected to the bending head and becomes common pivoted with the support disk and the bending head. The electric motor with a Reducing gear and the bending head and the rotatable support disc together a correspondingly large mass, in each bending operation and at each strand feed accelerated and decelerated again. Furthermore, for the Power supply to the mobile motors arranged cables etc. for a mobile Energy supply necessary. By mounting the second electric motor on the bending stand its displaceable mass is increased. The relatively large to be moved Masses limit the working speed and increase the susceptibility of the Bending machine. The free space in the range of movement of the workpiece is characterized severely limited.

From DE-PS 38 11 891, is another device for bending strand material known. On a horizontally movable stand is a bending head at a 360 ° rotatable vertical support disc attached. Parallel to the support disc on the stand is a Drive disc arranged, which via a bevel gear bending arm of a bending head pivoted and thereby performs a bend on the strand material. Of the Drive for both the support disc and for the bending head is done by two am sliding stand mounted motors with their associated gearboxes. At the Bending strands with multiple bending operations on the same strand, in particular on long strands, which between the bending operations a travel distance of 0.3m or more, in this bending device, the horizontally movable stand with its bending head together with the two drive motors and their Reduction gears are moved. Between yourself following bending operations at the same strand, the movable stand must be accelerated and braked again be, which is correspondingly time-consuming for relatively large masses. In the further trailing cables are required for the mobile engines.

The invention is based on the object to overcome the disadvantages described and in particular, to build a bending machine which provides great flexibility, i. a rapid conversion to other products allowed and a compact relatively light weight Has bending stand. In addition, space is created in the area of the bending stand be so for facilities for loading and unloading the bending machine a good accessibility is available. Another objective is the achievement of a high bending cycle number per unit time on the same bending part or in itself Bending parts by reduction of the moving masses and a high bending precision. In addition, the ease of maintenance of the machine should be improved.

According to the invention, this object is achieved by the characterizing features of Claim 1 satisfied.

The bending machine according to the invention offers a compact bending stand high flexibility i. a quick conversion to other products. Also the free space in the Area of the bending stand creates additional freedom for the curved product as also optimal accessibility for facilities for loading and unloading. In the further By reducing the moving masses, a high number of cycles of bending operations, even with elongated curved tubes, a high bending precision and a improved serviceability of the machine can be achieved.

An advantageous Anodnung the drive units is achieved when this outside of predetermined displacement paths of the bending stand at the end of the machine bed are attached.

An inexpensive and precise drive is achievable when the drive units as Electric motors are designed, the driving force on profile waves on transmissions like timing belts, chains, etc. on the carrier disc and on the bending head transfer.

An advantageous arrangement of the force-transmitting machine elements results, when the profile shafts are mounted on the machine bed. Further advantages arise by the common displacement of the gears with the bending stand and the Transmission of the drive movements from the profile shafts via on the bending stand arranged transmissions on the support disc and the bending head.

A reduction of the movement tolerances of the support disk and the bending head are achievable when the sliding on the profile shafts gears with gears one on Bending stand arranged transmission are engaged and the transmission the Drive movement on a drive pulley and from this via gears on the Carrying support plate.

A compact design of the bending head and minimal movement masses are achievable if an internal gear wrench the drive movement via a gear on Bending head and a bevel gear transmits to the drive axle for the bending operation.

Small tolerances in the movements are according to an embodiment achievable when the drive axle for the bending operation carries a gear that with a rack disposed on the bending arm engages and a support rail before the Biegearmverschwenkung by a linear motion leads to the strand. in the Furthermore, a cam can be arranged on the drive axle for the bending operation which is in contact with a linearly movable scanner and which the Transfers linear motion to a slide rail.

The pivoting movement of the bending arm is automatically initiated when the support rail has reached a support position on the tubular strand.

In order to obtain dimensionally accurate bent workpieces, those are the bending operation decisive movement tolerances are of crucial importance. It is because of that advantageous, all gears involved in the motion transmission with reductions, from the drive motor to the bending head, to optimize. It will therefore proposed by the choice of the reduction of the engine speed at the gears to achieve the lowest possible movement tolerances before and after transmission.

In the following, the invention will be explained in more detail by way of example.

Fig. 1

eine Seitenansicht einer Einkopfbiegemaschine,

Fig. 2

eine zweite Seitenansicht auf die Biegemaschine gemäss Fig.1,

Fig. 3

eine Draufsicht auf Fig.1,

Fig. 4

einen Schnitt durch den Biegekopf nach der Linie IV-IV in Fig. 6,

Fig. 5

einen Schnitt gemäss der Linie V-V in Fig. 2,

Fig. 6

einen vom Biegeständer getrennten Biegekopf in Perspektive und

Fig. 7

einen Biegekopf ohne Biegewerkzeug und ohne Zahnstangenabdeckung.

Showing:

Fig. 1

a side view of a single-head bending machine,

Fig. 2

a second side view of the bending machine according to Fig.1,

Fig. 3

a plan view of Figure 1,

Fig. 4

a section through the bending head along the line IV-IV in Fig. 6,

Fig. 5

a section along the line VV in Fig. 2,

Fig. 6

a bending head separated from the bending stand in perspective and

Fig. 7

a bending head without bending tool and without rack cover.

In Fig.1-3 and 5, 1 is a machine bed for a bending machine according to the invention designated. On the machine bed 1, a strand holding device 2 are stationary and a in the direction of the central axis 3 of the unbent strand (not shown) displaceable Bending stand 4 arranged. The illustrated example in Fig. 1-3 shows a Einkopfbiegemaschine. By arranging a second machine bed and a second bending stand on the right side of the strand holding device 2, the Single-head bending machine can be extended to a double-head bending machine.

At the bending stand 4, as known from the prior art, a support disc 5 arranged for a bending head 6. The support plate 5 is about the central axis. 3 of the unbent strand is rotatably mounted through 360 ° and with a radial slot thirteenth provided for introducing the strand. Outside a predetermined displacement 8 of the bending stand 4 are drive units 9, 10 and 11 stationary at the end of Machine bed 1 arranged. The drives, in the example shown as electric motors formed, the following drive functions are assigned. The drive 9 can over a ball screw 12 the bending stand 4 along the machine bed 1 in Move direction of arrow 14. The drives 10 and 11 transmit their drive movement on profile shafts 15 and 16 e.g. Waves with a keyway on the Machine bed 1 are stored. The rotational movement of the profile shafts 15 and 16 is on Gears 17 and 18 transmitted, which are mounted on the profile shafts 15 and 16 and together are displaced with the bending stand 4. Transmission, e.g. toothed belt 20 and 21 transmit the drive movements to the support plate 5 or, as in Fig. 2nd represented indirectly via an additional drive pulley 19 and gears 22,23 on the Support disk 5 or on the bending head. 6

In Fig. 4, the bending head 6 is shown without bending stand 4 (Fig. 1,2 + 5). The bending head 6 receives its drive movement for the bending operation of the drive disk 19 via a ring gear 28 on a gear 35. The gear 35 is keyed on an axis 24, the drive via bevel gears 25 of the drive axle 26 for the bending operation feeds. At the end of the drive shaft 26, a bending tool 37 is clamped. In the further carries the drive shaft 26 is a cam 31, which with a scanner 38 in Contact and a linear movement on a slide 33 (Fig. 5 + 6) transmits. On the drive shaft 26, a gear 32 is also arranged, which with a rack 39 is engaged. The rack 39 transmits one shown in Fig. 5 + 6 Support rail 29 a linear movement.

6, the bending head 6 with a pivotable about the drive axis 26 bending arm 27 and the linearly movable in the direction of arrow 30 support rail 29 and provided in the direction of arrow 34 linearly movable slide 33. The bending tool 37 is placed on the drive axle 26.

In Fig. 7, the operation of the gear 32 and the rack 39 for the linear movement the support rail 29 easily recognizable. The gear 32 transmits at the beginning the bending operation, the rotational movement of the rack 39, the support rail 29th wearing. The support rail 29 is driven against a workpiece, not shown and clamps this in the bending tool 37 (Fig. 4,5,6). About the scanner 38 receives the slide 33 of the cam 31 is a linear movement to the bending tool 37 (Fig. 4,6). After the clamping of the workpiece by the Support rail 29 is self-acting by the movement stop of the support rail 29 the pivoting movement of the bending arm 27 initiated.

After a change of direction of the bevel gear 25, the bending arm 27 is pivoted back and then the support rail 29 retracted. The workpiece now lies without clamping on the bending tool 37 and the bending stand 4 can in a driven new position and another bending operation can be made on the workpiece become. In the same way, quickly one after the other programmatically necessary number of bends to be performed on a workpiece before it off the strand holding device 2 automatically or manually removed and a new workpiece can be inserted.

Claims (10)

Bending machine for bending strands, in particular of tubular strands, consisting of a strand holding device (2) and of a in the direction of the central axis (3) of the unbent strand on a machine bed (1) displaceable bending stand (4), wherein the bending stand with a to the Central axis (3) 360 ° rotatably mounted support disc (5) for a bending head (6) is provided and the support disc (5) has a radial slot (13) and drive units for the displacement of the bending stand (4), for the rotation of the support disc (5) and for bending with the bending head (6), characterized in that the drive units (9-11) for the displacement of the bending stand (4), for the rotation of the support disc (5) and for bending on the machine bed (1 ) arranged stationary and that along a displacement path (8) of the bending stand (4) on the machine bed (1) profile shafts (15, 16) for transmitting the drive movement of the stationary drive aggregates (10, 11) on the bending stand (4) are provided. Bending machine according to claim 1, characterized in that the drive units (9-11) outside a predetermined displacement path (8) of the bending position (4) at one end of the machine bed (1) are attached. Bending machine according to claim 1 or 2, characterized in that the drive units (10,11) are designed as electric motors, their driving force on the profile shafts (15,16) on gears (17, 18) and transmissions such as toothed belts (20,21) , Chains etc. on the support plate (5) and on the bending head (6) transmitted. Bending machine according to claim 3, characterized in that the profiled shafts (15, 16) are mounted on the machine bed and the toothed wheels (17, 18) are displaceably arranged together with the bending stand (4) along the profiled shafts (15, 16). Bending machine according to claim 3 or 4, characterized in that on the profile shafts (15,16) sliding gears (17,18) with gears arranged on the bending stand transmission (20,21) are engaged and the transmission, the drive movement to a drive pulley (19) and from this via gears (22,23) on the support disc (5) and the bending head (6) is transferable. Bending machine according to one of claims 1-5, characterized in that a toothed rim (28) transmits the drive movement to a toothed ring (28) engaging gear (35) and a bevel gear (25) on a drive axle (26) for the bending operation , Bending machine according to claim 6, characterized in that the drive axle (26) carries a toothed wheel (32) which meshes with a rack (39) arranged on the bending arm (27) and a support rail (29) before the bending arm pivoting by a linear movement Strand leads out. Bending machine according to claim 6, characterized in that the drive axle (26) carries a cam (31) which is in contact with a linearly movable scanner (38) and which transmits a linear movement to a slide rail (33). Bending machine according to one of claims 7 or 8, characterized in that a pivoting movement of the bending arm (27) upon reaching the supporting position of the support rail (29) on the strand is automatically introduced. Bending machine according to one of claims 3-9, characterized in that by the selection of the reduction of the engine speed by the gears (17, 18) and the transmission (20, 21) and of this on the drive pulley (19) the decisive in the bending process movement tolerances can be optimized.

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