DE870540C - Machine for shaping tubes to be welded later - Google Patents

Description

Machine for forming pipes to be laterally welded The object The invention relates to a machine for forming pipes to be welded lengthways made of sheet metal with a mandrel and a multi-part, bending the sheet metal around the mandrel Die.

A main purpose of the invention is to provide a modern and novel Develop machine in which the tube shaping of the cut or punched Sheet metal material takes place in such a way that the pipe gaps or open pipe gaps that occur The lengthwise seam is perfectly straight and even over the entire length and is precise axial direction, so that the same by means of a welding machine more common Execution can be welded easily and quickly. Another important purpose the invention is to provide an improved tube forming machine, in which the internal tension of the sheet material is first applied by preforming processing is compensated, whereupon the preformed sheet metal blank into the actual tube shape is finally formed.

Another purpose of the invention is to provide a molding machine for pipes with new and special properties, for a die or a die is used to preform the sheet material, wherein the pre-formed sheet metal cut then continues around a mandrel to the actual pipe or final formed and then automatically from the mandrel is stripped. At the same time, construction parts are provided that automatically create the die block Load the next sheet metal blank or sheet metal blank.

According to the invention, these intended purposes are achieved by that the die arranged in the underframe of a hydraulic press consists of two about a common hinge axis that is parallel to the pipe axis and arranged perpendicularly below it pivotable jaws containing the outer shape of the tube, the joint of which on a lowerable abutment and the ones themselves on the back of the machine bed abutments permitting a pivoting movement of the jaws are supported, and that the die head of the press extends the mandrel in the direction of the pipe axis and two the sheet metal resting on the edges of the die jaws when the die is open carries stamps that press into the die halves. Next is a stripping device provided which the stripping of the pipe from the mandrel during the retraction movement of the mandrel into the machine. Furthermore, on the longitudinally displaceable mandrel an undeformed sheet in the jaws of the die when the mandrel is extended hinged sliding shoe.

In addition to these main features, your subject invention will come a , Number of other characteristics too, and it will list these and the actions to be taken in detail in the following part of the description in connection with the one embodiment of the subject matter of the invention, FIGS. 1 to 8 comprehensive drawing.

Fig. I is a view in elevation and elevation of the machine according to the invention seen from the front; Figure 2 is a side elevation view of the machine, that side being shown is on which the loading of the sheet metal blanks takes place; Fig. 3 is a side elevation the opposite side of the machine where the stripping of the pipe from the Thorn takes place; Fig: q. is an enlarged vertical cross-section through the machine, running essentially in the middle of the same from top to bottom, in which the different parts are shown in their mutual position or position, if the cut or punched sheet metal material has just been inserted; Fig. 5 is a view similar to that as in Eig. q., however, with the different parts are shown in their position to each other, as they are for the stage of preforming results; -Fig. 6 is a view similar to that of FIGS. 4 and 5, however, the different parts of the construction in their. mutual situation immediately are shown before the processing stage for the actual tube shaping; Fig. Fig. 7 is a view similar to that of Figs. Q., 5 and 6, in which the various Parts of the machine in their mutual position in the final stage of tube shaping processing to be shown; Fig. 8 is an enlarged vertical cross-section, in essence along the line 8-8 in Fig. 3, the various structural parts of the Machine are shown in their position to each other after the pipe from .the mandrel has been stripped off and the latter, ready for a new shaping work, back inside the machine.

Machines that use a mandrel to shape pipes or core used, around which the cut pipe sheet is pressed, are so far already been used. The products of these machines, which are already in use however, have not been overly satisfactory. With these machines it is common applied a process that can be referred to as the single point contact process, where there is only a point-wise pressure against the tube sheet. This can in some cases a shifting or shifting of the pipe sheet cut occurs, so that the finished pipe is no longer uniform over the entire length. aside from that : Flat spots tend to form on the pipe, and the pipe gaps or open pipe seams between the pipe sides is also not uniform.

It is with tube forming machines that leave an open seam, common to pass the formed pipe to a welding machine, through which the open Seam is welded in order to complete the pipe. Since welding machines usually work automatically and the welding process in a straight line in the axial or longitudinal direction runs, it is obvious that if the pipe gap is not exactly axial the seam weld is not uniform and that the weld is at one end of the pipe possibly missing at all. It is also imperative that the Pipe gaps or open pipe seams occurring along the entire length of the pipe towards is of uniform width and .that the pipe seam edges are exactly parallel. Such uniform pipe blanks could be made with the previously known shaping machines experience has shown that this cannot be achieved. It will - hence when using the machine remedied according to the invention a number of deficiencies and disadvantages, which are preferred suitable embodiment of the machine by the accompanying drawings is made clear.

Briefly stated, the above invention relates to the use a suitable machine in which a die steel block consisting of two rotatably supported Clamping jaw is assembled, pick up a suitably cut pipe sheet can. A movable die head is designed such that the sheet metal blank at close contact of the die head is preformed therewith, whereby a compensation of the internal material stresses is achieved by the metal during of the preforming process has the tendency to flow something. After this the preforming effecting operation is a mandrel or core. above the preformed sheet metal blank in correct Positioned, and the jaws of the die block are only caused to press the sheet metal blank around the mandrel, thereby performing the tube forming work is completed i Novel means are provided to automatically turn the pipe strip off the mandrel and load the die block with a new sheet metal blank.

The preferred for the realization of the inventive idea suitable Embodiment of the machine is shown in Figs. 1, 2 and 3 ausfuhr Licher. The machine is shown here as being provided with an underframe i that extends to a stable support 2 is applied in a suitable manner. In the camp : z a pit 3 is let in directly under the underframe 1. ! The base carries a die block q. as well as the vertically upward striving, pillars 5. The Columns 5 are able to carry a movable die head 6 on the underside of which a die 7 is attached. The die 7 can with the die steel block d. by Downward movement of the die head 6 are brought into contact. The overall arrangement the machine or press can preferably be operated by hydraulic means (is in the Drawing not shown) are operated, with about a piston within a Cylinder 8 is put into action. Any suitable and known in the art Hydraulic fluid system can be applied for the actuation of the press, and the same thing only needs from a usable supply source for the hydraulic To consist of liquid, which is passed under pressure against the piston in the cylinder 8 is and thereby moves the die head 6 downwards. The sweeping motion of the die head 6 can also be done by any suitable means, either hydraulic Pressure in the opposite direction or by a suction air device that does the recirculation causes. On a control panel 9 suitable controls for the Control of the inflow and outflow of the hydraulic fluid that the machine or Press starts to be present.

One side of the machine or press is with a suitable fixture equipped to support a larger pile of cut pipe sheets. If desired, these billet blanks can be fed into the machine by hand be brought in; however, they are preferably set automatically by means of a Structural parts supplied to the machine. The various individual components this side of the machine include a framework or scaffolding 1o that a movable support table 11 serves as a support. The carrier table is made of the Column foot 12 held and can be moved by the latter in a vertical plane, the actuation of the column base again by mechanical or hydraulic Funds can be made. The column base 12 for lifting the support table 11 can from be somehow suitable design that allows the support table 11 in the train the sheets 13 removed from it for the purpose of loading the machine automatically lifts upwards by a previously set distance so that the top Sheet metal cutting is always in the correct position in order to be able to use automatic Ways, which will be described in more detail later, introduced or used in the press to become.

The side opposite the side of the machine just described shows, as in Fig. 1 and 3, a T-shaped structural part 14 is shown, which has a mandrel 15 on its underside, this mandrel in its longitudinal direction from the position as shown in Figure 1 to a position immediately below of the die head of the press and in the opposite direction can be moved back and forth can. At one end of the T-shaped portion 14 is an outwardly and downwardly Arm 16 is attached which, as shown, has a sliding shoe attached to its outer end or otherwise suitable part 17 has. The sliding shoe 17 is set, as shown in dashed lines in FIG. 1 indicated, behind the end edge of a sheet metal blank 13 contact receiving at and brings the sheet metal blank into the correct position on the die block q. within the Press, as shown in Fig. 1 with sharp lines. If hence the T-shaped part 1.4 from the sharply marked position in FIG. 1 moved to the right, the shoe 17 also moves to the right and comes behind the right-hand end of the uppermost sheet metal blank 13 in the seated position. If the T-shaped part 14 is now returned to the left, sharply to that in FIG position shown in solid line, the sliding shoe 17 takes the during its movement supreme, d. H. next to be introduced cut pipe sheet 13 with and does the same thing on the die block q. in the right position.

The T-shaped part 14 is normally built into the die 7 and can be slid in the same. He is with another for the bracket designated auxiliary members 18 extending outwardly from the machine which in turn are alternately supported by the joint members 19.

The tube formed on the mandrel 15 is after the completion of the last one Shaping processing in the one shown in FIG. 1 with full lines Outward position 'taken away. A suitable arrangement is now provided to .that Stripping the pipe from the mandrel when the T-shaped part is in its working position returns within the press. At this point the pipe is mating in one Catch 2o dropped, whereupon the final formed tube is placed on a conveyor belt 22, from which there is a seam welding machine for continuous welding is passed on for welding the open pipe seam.

Up to this point, a general description of the mode of action should now appear of the machine both in the larger context and in terms of the details of the different processing stages. Let it now refer to FIG the FIGS. 4 to 7 describe the manner in which the the advantages mentioned above and listed separately at the outset can be achieved.

The Gesenkstählblock 4 (Figure 4) is composed of two straight 'to each other in opposition position beindliehen' jaws composed 23 and 24 which are connected by means of an elongated rod or shaft 25 in * their pivot points by journal bearing with each other. These clamping jaws extend essentially the width of the press and are long enough to accommodate and support the cut tubular sheet 13 in its entire length: The inner sides of the clamping jaws 23 and 24 also have elongated and inwardly curved surfaces or depressions 2b and 27, and the tube sheet 13 can, if -es- is used, rest at three points in the longitudinal direction. The two clamping jaws are designed in such a way that the tubular sheet 13 is supported in the middle; the same are also preferably provided with also elongated recesses 28 and 29, which have the purpose of receiving the longitudinal edges of the cut tubular sheet.

'One embedded in the base i and for vertical reciprocation set up plunger 3o carries an elongated support part at its upper end @ 31; who has a stake of 32. -The insert 32 is finite in the longitudinal direction extending concavely curved part 33 which is suitable for the undersides the clamping jaws 23 and 24 on their axis of rotation, which likewise runs in the longitudinal direction to be supported in a supporting manner: The undersides of the clamping jaws are on both sides of their axis of rotation supported by also extended support blocks 34 and 35. those of boLyenförmiL-en, in turn extending in the longitudinal direction and at a suitable point in the undercarriage i provided recesses 36 and 37 can be received. The tops the support blocks 34 and 35 are also concave in their totality, as in 38 and 39 identified in the drawing; creating a tight fit for the lower curved sides of the jaws z3 and 24 is guaranteed.

The movable die part 7 is also extended from one another separated and downwardly extending .Schenkel 4o and 41 provided, .. the on its lower side, as shown at 42 and 43 in the drawing, arcuate and are mirror images of each other .geformt or formed. The space 44 between the two legs 4öund4.z is designed in such a way that the T-shaped part 1q., which is shown in Fig: 4 can be slidably received therein, which also from Fig. I can be seen.

The first step in the operation of the machine is preforming of the cut raw sheet. - For this purpose, the die head 6 with the die 7 attached to it, guided downwards into the position - as in FIG. 5 shown: The T-shaped part 14 with the mandrel 15 can not interfere with `this' movement, because these parts are not inside the press during the: Voi-forming process, The legs 40 and 41 of the die? can act against the sheet metal blank 13 in this way attach that their lower sides of curvature into the recesses 26 and 27 of the jaws 23 and 24 are pressed. This preforming process is similar to that in the sheet metal blank existing material stresses and allows the material to flow, so that: the Endformgebüngsstufe can proceed better prepared and it becomes possible; the pipe gap or open pipe seam in exactly axial direction and with exactly parallel seam edges. to receive.

After the preforming has taken place, as in FIG. 6, the die head 6 is guided upwards again, and the T-shaped part 14 with the mandrel 15 is now, as shown in FIG. 8, brought back into the working position within the press . The mandrel is now moved downwards until it rests against the center line of the preformed sheet metal blank 13, whereupon the plunger 30 is also forced to move downwards by further downward movement of the countersunk head. The downward movement of the plunger 3o now also allows the downward movement of the pin or the shaft 25, on which the clamping jaws 23 and 24 sit, which are taken along. However, since the outer surfaces of the clamping jaws are in a more or less clamped position, the clamping jaws are forced to close by downward movement, as shown in FIG. The closing of the clamping jaws 23 and 24 also requires a rotary movement of the support blocks 34 and 35 in the manner shown. The finished formed tube 21 is therefore so by pressing the sheet metal blank around the .Dorn i5. generated, whereupon the die head 6 is guided upwards again, whereby it is possible that the clamping jaws open again.

In order to ensure reliable opening of the clamping jaws, you can somehow appropriate means won't be provided for this. , As a preferred training; leadership style a device is demonstrated herein consisting of one on each side of the die block arranged air intake cylinder 45 1 consists. The cylinder 45 has one inserted therein Piston which is firmly connected to a piston rod 46. Through a hinge 47 is the outer end of the piston rod 48 with. a bar 48, each on the jaws 23 and 24 seated, connected, the air suction cylinder assembly behaves normally the jaws for, outward or open position. As soon as the die head after the final shaping of the pipe went up and thereby also the upward movement of the plunger and the pin shaft 2.5 is released, the air intake cylinder occurs in action and ensures that the two clamping jaws are in their normal open position, as shown in Fig. 4, return to then pick up the next pipe sheet.

As soon as the die head 6 with the die 7 is finished Final shape is back in the upper position, the T-shaped part 14 is from the Press out in the position shown in Fig. I with sharp lines extended, and as this movement of the T-shaped part takes place, the die block is automatically transferred to the next one by the feeder parts 16 and 17 Sheet metal blank charged in the manner described above.

Movable support jaws 49 and 50 (Fig. 3), which are specially provided can be done at appropriate times during the operation of the machine be opened and closed to strip the pipe from the mandrel. Once the T-shaped part has reached its extreme position outside the machine, close the jaws, with their inner ends against the one closest to the machine Firmly attach the end of the just finished tube 2.1. The T-shaped part remains now during the preform processing process (Fig. q. and 5) in this position, whereupon he after the end of the same in the press to the position shown in Fig.6 is retracted again. During this latter movement of the T-shaped part hold the support jaws q.9 and 5o the tube 21, but they do the movement of the mandrel, so that in this way the pipe is stripped from the mandrel whereupon it falls down into a trap or rack 20. The pipe can now can be removed from there and placed on a conveyor belt 22, from which it becomes a Seam welding machine for continuous welding that the pipe gap is welded and thus the pipe is finally completed.

The tube shaped in the manner just described is devoid of flat ones Make, and the pipe gap is even and runs in exactly the axial direction. The numerous shortcomings inherent in conventional tube forming machines are thus overcome. The preform processing on the sheet metal blank creates to a certain extent the prerequisites in the material, -by the shaping of the finished product Rohres is facilitated.

It is clear that numerous changes regarding the design, Design and arrangement of individual structural parts compared to the above Opened can be made without detracting from the idea of a solution the invention is departed or that any of the operating advantages thereby is abandoned. For example, various special arrangements to be used for introducing the sheet metal blanks into the press, or the device for stripping the pipes, as described, can be different. Likewise, some can the drives, as described for starting the machine, hydraulic, others can be controlled mechanically without being affected by these changes of the invention underlying solution idea for the various processing stages, as shown, modified or impaired in some way.

Claims (3)

PATENT CLAIM: i. Machine for shaping parts to be welded lengthways later Pipes made of sheet metal with a mandrel and a multi-part, the sheet metal around the mandrel bending die, characterized in that the underframe is a hydraulic Press arranged die from two around one parallel to the pipe axis, perpendicular below this arranged, common pivot axis pivotable, the outer shape of the tube containing jaws, the joint on a lowerable abutment and: the even on their back on the machine bed via a pivoting movement of the jaws allowable abutments are supported, and that the die head of the press the in Direction of the tube axis extendable mandrel and two with the die open The sheet metal resting on the edges of the die jaws is pressed into the die halves Wears stamp. 2. Machine according to claim i, characterized by a stripping device, the stripping of the pipe from the mandrel during the retraction movement of the mandrel in the machine does. 3. Machine according to claim i, characterized in that on the longitudinally displaceable mandrel an undeformed sheet metal in the jaws of the die when the mandrel is extended, the sliding shoe is articulated.