DE102016106026B3 - Drawing systems and drawing processes - Google Patents

Abstract

The straightness of the drawn or issued by the drawing workpieces is optimized when a drawing machine, which comprises at least one drawing die and at least one pulling direction behind the die arranged pulling machine, arranged in the drawing direction behind the drawing machine measuring device for measuring the deflection of a free Area, in particular a free end, of the drawing plant continuous workpiece distinguished, or if a method for drawing a workpiece by a pulling direction in front of at least one drawing die arranged die of a drawing characterized by the fact that the deflection of a free area, in particular a free end of Workpiece is measured behind the drawing machine.

Description

The invention relates to a drawing system comprising at least one drawing die and at least one drawing machine arranged behind the drawing die in drawing direction. Likewise, the invention relates to a method for drawing a workpiece by a pull in a drawing direction before at least one drawing die of a drawing system.

Such Ziehanlagen or drawing methods are for example from the DE 10 2009 039 873 A1 , of the DE 195 44 383 C1 or the WO 2015/075660 A2 It is understood that corresponding drawing systems can also be constructed much more complex and can include, for example, other drawing machines and drawing dies to enable cascading, as well as straightening machines, separating devices and the like.

It is an object of the present invention to provide generic drawing systems or drawing methods in which the straightness of the drawn or output from the drawing machine workpieces can be optimized.

The object of the invention is achieved by a drawing system or a drawing method with the features of the independent claims. Further, possibly also independent thereof, advantageous embodiments can be found in the subclaims and the following description.

Thus, the straightness of the drawn or issued by the drawing machine workpieces can be optimized when a drawing machine, which comprises at least one drawing die and at least one pulling direction behind the die arranged pulling machine, arranged in the drawing direction behind the drawing machine measuring device for measuring a deflection or a force applied against a guide of a free area of a drawing system passing workpiece characterized.

Likewise, the straightness of the drawn or issued by a drawing machine workpieces can be optimized when a method for drawing a workpiece by pulling in front of at least one drawing die arranged die of a drawing characterized by the fact that the deflection or a force applied against a guide of a free area of the workpiece behind the drawing machine is measured.

In a drawing system, the workpiece is usually performed as narrow as possible and targeted, even to prevent malfunction as possible. As a result, the workpiece moves in the drawing system usually along itself or along its longitudinal direction. This leadership is done on the one hand by drives, as well as by the drawing machine itself, by driven rolls of straightening machines or other driven rollers, or on the other hand by passive assemblies, such as idler rollers or rollers, guide rails or tubes or other the running of the workpiece in desired Direction guiding assemblies. These guides require that the workpiece not relax and thus break out or laterally exert forces, especially when it is stretched by the drives in its longitudinal direction.

On the other hand, free areas in which the workpiece is not guided or stretched on one side in its direction of longitudinal extent and / or in which the workpiece can deflect allow measurements to be taken even in the case of a workpiece moving along its longitudinal direction or substantially along its longitudinal direction. to make statements about the straightness of the respective workpiece. In this respect, it is necessary to find or provide corresponding free areas in a drawing system in order to carry out measurements there or to provide corresponding measuring devices. Insofar as a force-measuring guide is provided, this is not restrictive in the determination of the "free area" because it requires free areas so that a workpiece can apply appropriate forces.

It seems to be particularly easy to implement technically if a free end is used as a free area which is to be measured accordingly. Here, influences in the straightness directly show up, since a free end tends to break out and therefore immediately a deflection or corresponding forces will cause if the corresponding workpiece is not straight.

The measurement of a free area, in particular a free end, already in the drawing system allows a very timely with respect to the drawing statement about the straightness of the drawn workpiece, so that accordingly can be acted promptly on the drawing process to the straightness of the drawn or to optimize workpieces issued by the drawing system. This is especially true in deviation from the usual straightness measurements, which is usually measured only on pre-cut workpieces at rest, if they have already left the drawing system.

Accordingly, the measurement is preferably carried out before the workpiece undergoes a change in direction and is no longer guided substantially along its own or is braked coming from the drawing machine.

In the drawing system, the workpiece is usually constantly guided so that only a few places a free end can be found. In the present case, a free end is understood to mean an unguided end. Accordingly, a free area is an area of the workpiece that is not guided over a corresponding distance or has sufficient leeway and is not drawn on both sides by drives so tightly that any oddities are smoothed.

In order to achieve reliable results in view of the relatively high speed of the workpieces leaving a drawing machine, it is advantageous if the free area or the free end over a free distance whose length is greater, preferably at least one and a half times greater than a machine and workpiece specific minimum distance, which can be left between two guides of the drawing without a funnel or other capture mechanisms, is guided unguided or sufficiently free to move.

Corresponding drawing systems may include different drawing machines, such as 2-slide drawing machines, in which two drawing carriages reciprocate, alternately grasp the corresponding workpiece and pull it through the die, or else caterpillars. It is understood that other drawing machines can be used in appropriate drawing systems, the latter certainly only makes sense if these other drawing machines with regard to the straightness of the drawn or issued by the drawing machine work relevant little on the workpieces disadvantageous.

As workpieces, in particular straight rods, rods or tubes are suitable for pulling, which may well have complex profilings in their cross section. As a rule, metallic workpieces are processed by drawing.

During the drawing, a forming process is performed on the workpiece via the die and optionally via a mandrel provided in the workpiece by this workpiece is drawn by the drawing die and optionally on the mandrel due to the force applied to the drawing machine. In this case, there are quite pulling systems in which the die moves counter to the pulling direction and the workpiece is held, which may then be carried out a stepwise pulling, in order to process longer workpieces accordingly. Frequently, however, the die is left stationary, and the workpiece are pulled by the respective drawing machine through this stationary die.

Finally, the measurement can take place at any point of the drawing system, as far as the respective free end, which is to be measured, has left the corresponding drawing machine and insofar the workpiece has not yet significantly reduced the speed with which it has passed through the drawing machine, or as long as it has not undergone any significant change of direction. In the drawing system, the speed of the workpiece is first determined by the drawing machine, since the workpiece is forced to move along its main line of extension. Possibly. For example, the speed of the workpiece may even increase if, for example, a severed portion of the workpiece is withdrawn more rapidly after a separator to separate it from the remainder of the workpiece. Any speed reductions, for example for subsequent more complex measuring operations, or even changes in direction, for example in a transition to a cross conveyor, take place in plant parts which are relatively far away from the die and the drawing machine.

However, for drawn workpieces as free ends that can be subjected to a corresponding measurement, initially only the front end or the rear end are available, whereby the one-piece nature of the respective workpiece passing through the die and the drawing machine results in being in between meaningful straightness measurements do not seem possible without supplementary measures. In addition, measurements of the end of the workpiece initially seem to make little sense, since they can no longer influence the ongoing drawing process and can serve as an indicator for subsequent drawing operations. Also, the front end of a workpiece, as it is moved by the die and the subsequent drawing machine, usually designed as an angel, so that the workpiece can be introduced through the die into the drawing system and reliably seized by the subsequently arranged drawing machine. This often also serve complementary tongs and the like. Such an angel at the front end of the workpiece, however, is subject to a variety of actions, so that from such a fishing a confident statement on the straightness of the drawn by the drawing system workpiece, if any, can be hit only with great difficulty.

Accordingly, it is advantageous if the measurement of the deflection of a free end of a workpiece after cutting the workpiece and before re-capturing the free end. In this respect, it is advantageous if the measuring device in the drawing direction behind a separator for separating the drawn workpiece and is arranged in front of an associated workpiece catch. Once the workpiece has been captured, it is only possible to talk of a free end conditionally. However, after separation and before recapturing, the corresponding free end may relax following its natural curvature so that a measurement made in this state can provide an indication of the straightness of the particular workpiece being drawn or delivered by the drawing machine - and this also in areas which are to be found in the middle or inside of the workpiece with regard to the length of the drawn by the die and the drawing machine workpiece.

Although may be between the separator and the drawing machine or the die or drawing ring a certain distance, so that the time and thus the workpiece length, up to which then responds to a measurement result and appropriate action can be performed on the die or the drawing machine, quite can lead to a certain committee. However, by measuring after cutting the workpiece and before recapturing the free end or by means of a measuring device arranged behind a separating device and in front of a workpiece holder, it is possible for the first time to affect the drawing relatively early, in order at least to produce the result for the following To be able to improve the drawing process accordingly. In addition, there is usually the possibility of either inferior drawn or not so straight workpieces a separate straightening process or use for other purposes.

As already stated above, both a rear and a front end of the workpiece can be used for the corresponding measurements. Preferably, the free end, which is measured accordingly, seen in the pulling direction front end of the workpiece. This has the advantage on the one hand that a triggering of the measurement, that is the targeted start of the corresponding measuring process, is easier to initiate with respect to a front end, which can be done, for example, by passing the corresponding front end of a light curtain or a light barrier. On the other hand, often the rear end of a workpiece is withdrawn very quickly to provide a certain distance to the subsequent workpiece. This is in particular in the course of a separation of the workpiece or after a separator of the case. Accordingly, for a measurement of a rear end of a correspondingly faster withdrawn workpiece remains only a shorter period of time, which leaves the measurement accordingly more complex. Both of the aforementioned disadvantages do not occur when the free end is a front end in the drawing direction of the workpiece.

Under certain circumstances, it may also be feasible to measure other free areas of the respective workpiece. In this way, depending on the concrete implementation of this approach, cumulatively or alternatively to the measurement of free ends, statements about the straightness even closer to the drawing machine itself and / or more accurate statements about the straightness can be made by supplementary measurements. In this case, for example, a distance that is required for the separation and must be followed by a pair of scissors or other cutting tool following the workpiece, and the resulting free area in a separator for such measurements are used, even if just no free end for appropriate Measurements are available as long as the separator itself does not interfere with the measurement and a subsequent, the corresponding workpiece deducting deduction does not force the workpiece. Possibly. appropriate free areas can also be provided at other locations of the drawing system, for example in front of a separating device or directly behind the drawing machine.

In the present context, the term "deflection" denotes the position with which a free area or the free end of a measuring point seen perpendicular to the drawing direction. During drawing operations, the workpiece moves regularly along itself, which corresponds to the longitudinal axis of the straight workpiece and is enforced by appropriate guides or immediately after the die and by the drawing forces. In the absence of straightness, a free end will accordingly leave a rectilinear path perpendicular to this path, the latter also naturally occurring due to gravity.

The measured deflection can be indicated, for example, in x-y coordinates or also in angle or cylindrical or polar coordinates, it being understood that depending on the measuring device used here, other parameters can be determined and further processed if corresponding conversions do not appear necessary. This also applies to the indication of the force, which can be given for example as a corresponding vector, which can be used in particular for measurements before a separation or even for very long workpieces.

As measuring devices are in particular cameras, distance sensors or light curtains and the like in question, with which a corresponding deflection can be determined. In practice, especially in the market Available roundness measuring devices proved to be applicable, especially as these roundness measuring instruments generally output as measurement results not only the roundness of a workpiece passing through them but also their deflection. In general, such Rundheitsmessgeräte provide a corresponding trigger signal, so that only a meter both a measurement can be started targeted and a statement about the deflection can be made, where - if necessary - measurements on the roundness can be evaluated, if this is because of the Velocity of the moving workpieces makes sense. When using a funnel as a workpiece catch, for example, the impact of the front end of the workpiece on the workpiece catch can be measured by mechanical or acoustic measurement methods, which can accordingly serve as a measuring device.

Also, for measuring free areas that are not free ends, such arrangements can be used. In general, additional measures will be necessary to sufficiently large distances, in which then a free area to a metrologically relevant deflection or force is able to bridge so that the respective workpieces are still performed sufficiently reliable in the drawing system , For example, collecting funnels and the like can serve in particular for this purpose, so that the workpiece, when it leaves its rectilinear path along an unguided path, can be recaptured and the unguided path then allows a free region of the workpiece. Likewise, for example, a transferring guide, which bridges the corresponding path and then releases the workpiece along this path or then withdraws, can be used accordingly. Also, for example, movable guides, such as corrugated hoses, plastic hoses or the like, are used for this purpose, in which case, when the deflection is used as a measure of the straightness, the deflection of the movable guide can be used as a measure.

To measure a lateral force, for example, impellers, possibly also driven rollers, and the like can serve as measuring devices, which are provided with appropriately aligned transducers, such as for example with load cells, strain gauges and the like. Likewise, passive areas, such as sections of a sliding guide, for example, a guide tube, measure according to forces, which can be done for example by force sensors or power cells. Also, movable guides can be used to measure a lateral force by first passing a workpiece over a free area and then, for example, moving it back to the middle of the free area to then measure it. It is advantageous if as large as possible guide paths on both sides of the measuring devices are free or sufficiently flexible, so as not to reduce a force on the measuring device too much, by absorbing these forces in the not provided with transducers areas of the guides and thus for the actual force measurement would no longer be available.

It goes without saying that, for example, a switch projecting into the drawing axis or the path of the workpieces, a separate light curtain or even a separate roundness measuring device can be provided in order to trigger the measuring process as such and a separate measuring unit, such as a set of cameras or to use a supplementary light curtain or a complementary roundness measuring device according to determine the deflection. It is also understood that a corresponding triggering, for example, by a signal of an already existing unit, such as by an output signal of a cutting shear, can be done. In practice, for example, after a triggering over 15 measurements, an average value can be formed, which is then output as the measurement result of the deflection. The number of measurements and the trigger time are then preferably adapted to the corresponding conditions of the individual drawing system, in which case it should be ensured in particular that the workpiece does not yet touch a subsequent workpiece catch in order not to falsify the measurement result as far as possible. In this respect, it is understood that if an impact on the workpiece catch is to be used specifically for example for a mechanical or acoustic measurement, only the first impact is used for the measurement.

As already stated above, it is conceivable that during measurement of the deflection also take further measurements, so it is conceivable, for example, when using cameras, also make a cut control with respect to the separation process in the separator. Likewise, a diameter control or a cross-sectional control can already be carried out there. If, for example, known roundness measuring devices are used for measuring the deflection, their measurement result can of course also be used to determine the roundness of the respective workpiece.

Preferably, the measurement result is displayed, so that an operator can immediately information about the drawing process can be provided. The latter will Accordingly, also allows when the measuring device is connected to a display. In this case, the display can indicate the deflection, for example in polar coordinates or in xy coordinates, to the operator, who can then initiate corresponding measures with which the straightness can be improved. A corresponding display can in particular also be made graphically in such a way that an image of the workpiece is shown in its cross section in a corresponding polar coordinate or xy coordinates diagram. This immediately allows a visual impression of the deflection, which a machine operator without such a display or without a corresponding measurement can not procure, since he ultimately only from the side or only at extremely blunt angles the respective workpieces can be considered.

Especially the employment of the drawing die with respect to the subsequent drawing machine has apparently a considerable influence on the straightness of the drawn or output from the drawing workpieces. In this respect, it is advantageous if the die is made in relation to the drawing machine in dependence on the measurement result. Likewise, if the die is adjustable via a controllable die setting with respect to the drawing machine, the die setting may be connected to the measuring device via a control unit. In this way, it is possible that the measurement result is used as quickly as possible - and without external intervention by a machine operator and the like - directly for the Ziehsteinanstellung to optimize the straightness of the drawn or issued by the drawing machine workpieces.

Here, the Ziehsteinanstellung can be adjusted according to the specific mechanical engineering and with regard to the process required necessities. Thus, the Ziehsteinanstellung for example by means of a movement perpendicular to the drawing direction, ie by means of an x-y movement done. It is also conceivable to vary the angle of inclination of the drawing die with respect to the drawing direction, which can also be done gimbalically, or by changing the angle about an x-axis and a y-axis, which are preferably perpendicular to the drawing axis.

Depending on the specific design of the drawing system, it may seem necessary that a workpiece feed, which is arranged in the drawing direction before the die and how they for example from the DE 10 2009 039 873 A1 is known, a corresponding Ziehsteinanstellung, as described above, follows, in order not to affect the roundness or a uniform cross-sectional distribution of the workpiece disadvantageous by the Ziehsteinanstellung. For larger drawing machines, which have several dies and drawing machines cascaded in succession, however, for example, the first die with respect to a corresponding workpiece supply in terms of roundness and cross-section can be made, while ultimately the subsequent drawing dies in terms of straightness with respect to the following drawing machines be optimized, since this seems to be the decisive influence in terms of straightness.

As already stated above, the measurements can also be combined with roundness measurements. These measurement results can also be used, if desired or required, in addition to the straightness measurements for a setting of the drawing die. Possibly. It is also conceivable to use cross-sectional measurements, if suitable measuring devices are located or arranged behind the drawing machine, for a drawing tool position as a measurement result.

Accordingly, it is advantageous if the setting of the die by a control unit in dependence on the measurement result.

Preferably, the employment of the die can also be carried out in dependence on a desired value, which can be predetermined by a machine operator or similar operating personnel. In this way, the straightness of the workpieces can be optimized very quickly and according to the experience of the machine operator or the operator.

Accordingly, it is advantageous if a control loop formed by the die, the drawing machine, the measuring device and the control unit comprises a desired value input device. It is understood that this control loop may optionally also include other components.

The desired value can be input here, for example, via keyboards or also graphically, for example via the diagrammatic display explained above, if this comprises a graphical user interface.

In this respect, it is advantageous if the target value is the target point at which the respective workpiece end should have a certain deflection. In this case, this target point can certainly also deviate from the drawing center, from the drawing axis or from the drawing direction and, for example, be slightly below the same if, for example, the influence of gravity is to be taken into account. In the control process or for determining the desired value or determination of the target point, the winding direction of the coil, from which the workpiece to be drawn is unwound for drawing, or further measurements subsequently carried out, For example, straightness measurements or straightness measurements of selected workpieces at rest can be used on the end product.

It is understood that further parameters can be used to determine the setpoint. This can be, for example, previous measurement results or information about the starting material.

It is understood that the features of the solutions described above or in the claims can optionally also be combined in order to implement the advantages in a cumulative manner.

Further advantages, objects and features of the present invention will be explained with reference to the following description of exemplary embodiments, which are shown in particular in the appended drawing. In the drawing show:

1 a schematic side view of a first drawing system;

2 a schematic side view of a second drawing system;

3 a schematic side view of a third drawing system; and

4 a schematic side view of a fourth drawing system ;.

The drawing systems shown in the figures 10 each include a die 20 and a pulling machine disposed behind the die in the drawing direction 30 ,

All drawing machines 30 follows in the direction of pulling 40 each a separator 60 with a flying pair of scissors 62 , wherein in the embodiment according to 1 between the drawing machine 30 and the separator 60 another straightener 14 is arranged.

It is understood that also in the embodiments of the 2 . 3 and 4 a straightening machine may be provided, as well as it is understood that the straightening machine 14 of the embodiment according to 1 also can be omitted. It is also understood that between the separator 60 and the drawing machine 30 each other different aggregates, for example, other drawing machines or the like, can be provided.

The drawing machines 30 the embodiments according to 1 and 3 each comprise a 2-slide drawing machine and accordingly two drawing slides 32 , The drawing machines 30 the embodiments according to 2 and 4 however, include a caterpillar train 34 , it being understood that in different embodiments and deviating drawing machines can be provided without further notice.

After the separator 60 is a workpiece catch in all embodiments 64 provided, each as a funnel in front of a workpiece outlet 12 is arranged, with which the respective workpieces parallel to the drawing direction 40 the drawing system 10 each leave. It is understood that in such different embodiments, such a workpiece catch can also be dispensed with.

The workpiece outlet 12 is merely a tubular guide in these embodiments 16 trained, it being understood that even between the individual units of the drawing system 10 appropriate guides 16 may be provided, which, since they are well known in the art, not all shown and explained separately here. It is understood that in different embodiments, guides 16 , which are not tube-like but different, for example, represented by rollers or semi-open channels, can be provided.

It is further understood that the drawing system 10 optionally further subordinate aggregates may have, such as in particular a workpiece deduction, which the workpieces from the workpiece outlet 12 actively deducts, so in particular a distance between the workpieces, through the workpiece outlet 12 the drawing system 10 leave, can be increased.

Parallel to the drawing direction 40 shows the drawing system 10 a drawing axis 42 on, along which the workpieces through the drawing system 10 to run.

The drawing systems shown in the figures 10 each have a drawing tool 22 with actuators 24 on which a employment of the drawing stone 20 with respect to the subsequently arranged drawing machine 30 enable.

Here are the actuators 24 the drawing hiring 22 the embodiments according to 1 and 3 each designed as a rotary drive, which is a gimbal employment of the drawing die 20 in relation to the subsequent drawing machine 30 enable. In the embodiments according to 2 and 4 however, the actuators are 24 designed as linear drives, so that the die 20 along perpendicular to each other arranged sliding axes 46 in relation to the drawing machine 30 or with respect to the drawing axis 42 can be hired. Not shown in both figures, each perpendicular to the drawing plane standing axis of rotation 44 or displacement axis 46 ,

It is understood that in different embodiments, the corresponding Ziehsteinanstellungen 22 can also be combined or exchanged between the embodiments in order to set a possibility of the respective drawing die in the desired manner 20 in relation to the drawing axis 42 or with respect to the subsequent drawing machine 30 to enable.

In all embodiments, the separator is 60 following each one measuring device 50 arranged, which can measure the deflection of a free end of a workpiece - and in particular a respective front end of the workpiece.

The measurement result is transmitted via a corresponding evaluation unit 56 determined and displayed 52 shown. In this case, the display is carried out in the embodiments 1 and 3 in polar coordinates, while the display according to the embodiments in 2 and 4 done in xy coordinates. The present is the choice of the coordinates of the display 52 the possibility of adjusting the drawing tool 22 each adapted, but this is not mandatory. It is understood that other displays, in particular, for example, the output of numbers and the like, can be readily provided in addition or as an alternative.

In the embodiments according to 1 . 3 and 4 includes the measuring device 50 a laser measuring device 58 as a transducer, which can be used for roundness measurements. Such a laser measuring device 58 may in concrete embodiment, for example, have two or three linearly independent light curtains, which are generated by fanning laser beams. Corresponding shades are then measured, in this way - conventionally - the roundness of one in the laser measuring device 58 to investigate. In the present case, the corresponding laser measuring device 58 arranged such that it on the one hand at entry of a front end of a workpiece 15 Measurements with a frequency of 200 Heart triggers and simultaneously determined in these measurements, the local position within the field of measurement as an average. The latter takes place in interaction with the evaluation unit 56 , which then requires a corresponding display.

To protect the measuring device 50 is a protective funnel 66 before the actual measuring device 50 provided, wherein ultimately an impact of the workpiece on this protection judge 66 to a measurement result in the area of the edge of the measuring device 50 and a corresponding indication conditions, which still provides a sufficiently accurate information about the deflection of a machine operator or other operators. It is understood that such a protective funnel can also be advantageous regardless of the specific choice of the respective measuring device.

At the in 2 illustrated embodiment are cameras 59 provided as a transducer, which detect the front free end of a freshly severed by the separator workpieces, which by a light curtain 57 , which is between the measuring field of the cameras 59 and the flying scissors 62 is arranged, triggered, but can alternatively be done in different embodiments in other ways, for example, depending on the position of the scissors. Here, the cameras can 59 not just the deflection from the camera image with the help of the evaluation unit 56 calculate and display. They also provide on a separate and not shown display a picture of the cross section for quality control.

All embodiments have multiple joysticks 28 on, by means of which via an actuator drive 26 the actuators 24 manually adapted to the respective measurement results. One of the joysticks 28 is located near the drawing die and the drawing machine 30 in order to be used there, in particular during threading operations by a machine operator or operating personnel. The other of the joysticks 28 is near the ad 52 so that a machine operator or operating personnel according to the results of the test the drawing die 20 via the actuator drive 26 can do.

In the embodiments according to 1 . 3 and 4 is also a control unit 54 provided, which on the one hand with the evaluation 56 and on the other hand with the actuator drive 28 connected, so according to measurement results directly through the control unit 54 and the actuator drive 26 for adjusting the corresponding drawing die 20 can be used.

According to the present embodiment 1 are beyond the joysticks 28 in a special operating position able to over the display 52 as a graphical user interface also specify a target value for the deflection, which the control unit 54 serves as a target, so that a corresponding control loop can be closed. However, the latter is not absolutely necessary, which also applies in particular to the input of desired values.

It is understood that the corresponding also in the embodiments according to 2 to 4 may be provided or that on a corresponding control unit 54 in the embodiment according to 1 if necessary, can also be dispensed with.

At the in 3 and 4 illustrated embodiments, the distance between the drawing machine 30 and the separator 60 through a guide 16 bridged, it being understood that all embodiments ultimately guides 16 have for the respective workpieces.

The between the drawing machine 30 and the separator 60 of the two embodiments 3 and 4 planned tour 16 However, each also serves as a measuring device 50 ,

This is the guide 16 of the embodiment according to 3 as a mobile leadership 18 formed, which immediately after the drawing machine 30 and immediately before the ripper 60 is fixed, so that the respective workpiece, as long as it is not on both sides, from the drawing machine 30 and from the separator 60 or of one of the separating device 60 still subsequent unit is clamped in the movable guide 18 according to its natural, deviate from the straightness extension can relax. The case occurring deflection of the workpiece and the resulting deflection of the movable guide 18 can then from an additional laser measuring device 58 Measured accordingly as a measuring sensor and to the evaluation unit 56 are given. Depending on the concrete implementation, this can be shown in another advertisement or in a supplementary presentation of the advertisement 52 are displayed.

The mobile leadership 18 is formed in this embodiment by a metallic corrugated hose, wherein in different embodiments, plastic hoses or the like can be used.

According to the embodiment 4 however, the leadership includes 16 a flying guide 19 comprising a guide tube (not numbered) similar to the flying scissors 62 is movable, and which serves to start a workpiece from the drawing machine 30 to a force-measuring leadership 17 to pass, which is just before the separator 60 is provided. After handover to the force-measuring leadership 18 drives the flying guide 19 back to their original position, so that the workpiece then between the guide tube located in its initial position flying guide 19 and the force-measuring leadership 17 is unguided. The force-measuring leadership 17 includes in this embodiment mounted with force sensors guide rollers 55 (numbered as an example) or guide rollers 55 with load cells, leaving a perpendicular to the pulling direction 40 or to the drawing axis 42 on the force-measuring leadership 17 can be measured. Now is the workpiece from the separator 60 no longer guided after separation, it may, according to its lack of straightness, a force on the force-measuring guide rollers 55 exercise their strength and direction is a measure of the straightness and, accordingly, the evaluation unit 56 transmitted and displayed by this or otherwise processed.

Instead of the leadership roles 55 also guide rollers, guide tubes or similar guide devices can be used accordingly. It is also conceivable that the movable guide 18 further from the subsequent units, such as the separator 60 may be provided remote, then possibly also here a flying guide 19 can be provided.

Likewise, the flying leadership 19 also instead of a movable guide tube other leading usable facilities, such as guide rollers and the like wear. It is understood that in a different embodiment, the flying guide 19 can be designed as force-measuring guide, in which case on the force-measuring guide 17 of the embodiment according to 4 if necessary, can be dispensed with and where the flying leadership 19 first a workpiece beginning of the drawing machine 30 to the separating device - or in other embodiments over another free area - transferred to then move back to the free area, and preferably approximately in the middle, and then perform the force measurements there.

According to the embodiment 3 can instead of the laser measuring device 58 or instead of other, a deviation of measuring transducers, such as a light curtain or even like cameras, a force measurement can be performed by the movable guide 18 is additionally designed as force-measuring leadership. For this purpose, for example, suitable force sensors on the movable guide 18 , preferably approximately in the middle, be provided.

Also, if necessary, according to the embodiment 4 the force-measuring leadership 17 omitted and instead a normal leadership 16 provided and a measurement of the deviation are made. For this purpose, the deflection in the unguided area between the movable guide of the flying guide 19 on the one hand and the force-measuring leadership 17 replacing leadership 16 On the other hand, be measured by suitable transducers for measuring a deflection, for which purpose, for example, light curtains, laser measuring devices, such as roundness measuring devices, or cameras can be used.

It is understood that in the embodiments according to 3 and 4 provided additional measuring equipment 50 also as an alternative to the measuring equipment 50 , which the separator 60 are subordinate, can be provided.

LIST OF REFERENCE NUMBERS

10

drawing plant

12

Workpiece outlet

14

straightener

16

guide

17

force-measuring leadership

18

mobile leadership

19

flying guide

20

die

22

Die employment

24

actuator

26

Actuator control

28

joystick

30

drawing machine

32

drawing carriage

34

caterpillar

40

drawing direction

42

drawing axis

44

axis of rotation

46

displacement axis

50

measuring device

52

display

54

control unit

55

leadership

56

evaluation

57

light curtain

58

Laser measuring device

59

camera

60

separator

62

flying scissors

64

Workpiece Fang

66

protective cone

Claims (10)

Drawing system ( 10 ) comprising at least one die ( 20 ) and at least one in the drawing direction ( 40 ) behind the die ( 20 ) arranged pulling machine ( 30 ), characterized by a pulling direction ( 40 ) behind the drawing machine ( 30 ) and behind a separator ( 60 ) for separating a drawing system ( 10 ) passing, drawn workpiece and before an associated workpiece catch ( 64 ) arranged measuring device ( 50 ) for measuring a deflection or against a force-measuring guide ( 17 ) applied force of a free area of the workpiece and by a Ziehsteinangstellung ( 22 ) over which the die ( 20 ) with respect to the drawing machine ( 30 ) is adjustable, wherein the Ziehsteinangstellung ( 22 ) with the measuring device ( 50 ) via a control unit ( 54 ) connected is. Drawing system ( 10 ) according to claim 1, characterized in that a through the die ( 20 ), the drawing machine ( 30 ), the measuring device ( 50 ) and the control unit ( 54 ) formed control loop comprises a setpoint input device. Drawing system ( 10 ) according to claim 1 or 2, characterized in that the measuring device ( 50 ) with an advertisement ( 52 ) connected is. Drawing system ( 10 ) comprising at least one die ( 20 ) and at least one in the drawing direction ( 40 ) behind the die ( 20 ) arranged pulling machine ( 30 ), characterized by a pulling direction ( 40 ) behind the drawing machine ( 30 ) and behind a separator ( 60 ) for separating a drawing system ( 10 ) passing, drawn workpiece and before an associated workpiece catch ( 64 ) arranged measuring device ( 50 ) for measuring a deflection or against a force-measuring guide ( 17 ) applied force of a free area of the workpiece and by a Ziehsteinangstellung ( 22 ) over which the die ( 20 ) with respect to the drawing machine ( 30 ) is adjustable, wherein the measuring device ( 50 ) with an advertisement ( 52 ) and an input device (joystick 28 ) near the display ( 52 ), so that a machine operator or operating staff is 52 ) displayed the drawing die ( 20 ) can do. Drawing system ( 10 ) according to one of claims 1 to 4, characterized in that the free area is a free end of the workpiece. Drawing system ( 10 ) according to claim 5, characterized in that the free end in a pulling direction ( 40 ) is front end of the workpiece. Method for drawing a workpiece through a pulling direction ( 40 ) in front of at least one drawing machine ( 30 ) arranged die ( 20 ) of a drawing plant ( 10 ), characterized in that a deflection or against a force-measuring guide ( 17 ) applied force of a free end of the workpiece behind the drawing machine ( 30 ) after a cutting of the workpiece and before a re-capture of the free end measured and the die ( 20 ) with respect to the drawing machine ( 30 ) is made in response to the measurement result. Drawing method according to claim 7, characterized in that the free end is in the pulling direction ( 40 ) is front end of the workpiece. Drawing method according to claim 7 or 8, characterized in that the measurement result is displayed. Drawing method according to one of claims 7 to 9, characterized in that the drawing die ( 20 ) with respect to the drawing machine ( 30 ) is made in response to the measurement result and in response to a target value.

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