EP3406362A1 - Endless track train drawing machine and process for drawing - Google Patents

Abstract

A crawler drawing machine and a method of drawing longitudinally extending workpieces may rotatably attach at least one puller tool to a tool holder and / or may include at least two identical pull cradles selectively engageable in a pull position to minimize the effect of any fatigue phenomena. For the same reason, a crawler drawing machine is advantageous in which the two chains of the caterpillar train are block chains and are supported in each case via a caster roller chain of casters on each one Anpressbalken.

Description

The invention relates to a crawler drawing machine. Likewise, the invention relates to a drawing process.

Such caterpillars and such drawing methods are for example from EP 0 864 382 A1 , from the DE 199 47 806 A1 , from the EP 1 385 647 B1 , from the WO 2006/002613 A1 , from the EP 0 548 723 B2 , from the EP 2 197 601 B1 or from the EP 1 210 187 B1 are known and each serve the drawing of longitudinally extending workpieces in a drawing direction along a drawing line by a drawing die by means of a arranged in the drawing direction behind the die caterpillar. The caterpillars in this case have at least two circulating chains, each having at least one tool holder each carrying a drawing tool in a drawing position, and pressing means for applying a contact pressure force to the respective drawing tools with a component directed towards the drawing line.

It is an object of the present invention to provide a generic crawler drawing machine and a generic drawing method in which the influence of any signs of fatigue is minimized.

The object of the invention is achieved by caterpillars and 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, a crawler drawing machine for drawing a longitudinally extending workpiece in a drawing direction along a drawing line by a die comprising the die and a caterpillar having at least two circumferential chains disposed behind the die in the drawing direction may each have at least one die each in a drawing position having supporting tool holder, and with pressing means for applying a contact pressure on the respective drawing tools with a directed to the drawing line component, wherein the respective drawing tool has at least one Ziehausnehmung, in its drawing position in a gripping region of the caterpillar with one of his Ziehausnehmungen on the workpiece fitting and means the contact pressure on the workpiece characterized in that at least one of the drawing tools is rotatably mounted on the tool holder to minimize the influence of any signs of fatigue. With a suitable procedure, in particular, it is possible to respond efficiently to fatigue phenomena of the material from which the drawing tools are provided by, for example, rotating the drawing tools.

Such a rotatable attachment of the drawing tool to the tool holder allows the drawing tool can be rotated for example by 180 °, with the Ziehausnehmung also rotates 180 °. By this 180 ° rotation, the same Ziehausnehmung can be used in both directions of pull for several drawing operations in a suitable embodiment.

In this case, on the one hand, the tool can be rotated for example by 180 ° and in turn used for pulling in the rotated position, for example, to counteract a one-sided frictional force, whereby fatigue phenomena, such as hairline cracks or roughness differences can arise. Thus, the tool can be used much longer.

It is also conceivable that the workpiece rotates, for example, only by 90 °, in which case preferably two mutually perpendicular Ziehausnehmungen are arranged on the drawing tool. Here, by a rotatable attachment of the drawing tool to the tool holder for subsequent drawing operations in a structurally simple way, a new active Ziehausnehmung be selected, which accordingly can also be used to counteract signs of fatigue. Possibly. can also be offset by 90 °, different Ziehausnehmungen be provided so that then the respective drawing tool can be adapted by turning quickly and reliably to different workpieces. On the other hand, it is advantageous to provide corresponding Ziehausnehmungen so that the risk of fatigue can be effectively countered by turning in each case by 90 ° or 180 °.

The rotatable attachment of the respective pulling tool to the corresponding tool holder makes it possible to perform a corresponding displacement of the respective pulling tool on the respective tool holder quickly and reliably.

In addition, a crawler drawing machine for drawing crawler drawing machine for drawing a longitudinally extending workpiece in a drawing direction along a drawing line by a die comprising the die and a drawing direction in the drawing direction the caster arranged caterpillar with at least two circumferential chains, each having at least one respective pulling tool in a drawing position bearing tool holder, and with pressing means for applying a contact pressure on the respective drawing tools with a directed to the drawing line component, wherein the respective drawing tool at least one Ziehausnehmung characterized in its pulling position in a gripping area of the caterpillar train with one of its Ziehausnehmungen rests against the workpiece and is pressed by means of the Anpressmittel to the workpiece, characterized in that at least one of the drawing tools has at least two identical Ziehausnehmungen which are selectively be brought into a drawing position, to minimize the influence of any signs of fatigue. With a suitable procedure, this can be responded to in particular efficient on fatigue of the material from which the drawing tools are provided by the drawing tools, for example, rotated or otherwise relocated to selectively spend each of the identical Ziehausnehmungen in the drawing position, so that in total the drawing tools in the area of their Ziehausnehmungen tire less quickly.

The two identical pull recesses make it possible, with a suitable procedure, to reduce the wear of the tool, since the change between the identical pull recesses means that the total load acting on the drawing tools in the area of the pull recesses can be correspondingly reduced.

Thus, a second identical Ziehausnehmung example, at right angles to the first Ziehausnehmung be present. To make this second identical Ziehausnehmung, the tool is rotated by 90 °. The second drawing recess is selected to be identical to the first drawing recess, so that the second identical drawing recess can be used for the same drawing operation or for the same size of the workpiece to be drawn. It is understood that a rotation of a different type of displacement, for example, a lateral displacement or the like can be used accordingly to change the position of the two Ziehausnehmungen accordingly. As a result, the wear of the tool is significantly reduced. For example, it is possible during the drawing process to vary as often as desired between the drawing recesses by displacing the workpiece, so that the two identical drawing recesses can also be used, in particular, in both directions, and thus worn. As a result, a uniform wear of the entire drawing tool is possible, the drawing tool overall holds much longer and no early tool change is required, which would lead to interruptions and thus deterioration of cycle times.

It is understood that, where appropriate, a Ziehausnehmung in both directions can be used to still provide a second identical Ziehausnehmungen, which is also used to minimize overall fatigue.

It is also conceivable that the first Ziehausnehmung is used to its complete wear, in particular in both Ziehrichtungen and subsequently the example, offset by 90 degrees second identical Ziehausnehmung is used for the drawing process. This has the advantage that after the wear of the first drawing recess not, as usual in the art, an entire tool change and thus a standstill of the machinery is necessary, but only a corresponding displacement of the drawing tool, for example by 90 ° or 180 ° , replaces the complete tool change, since with the second identical still unworn Ziehausnehmung can be pulled on. Possibly. can also be done here in the opposite direction, in which a Ziehausnehmung offset by 180 ° is used accordingly.

Advantageously, the two identical pull recesses are also used in both directions of pull. When used in one direction only, the surface of the drawing cavity may deform accordingly. By pulling in the corresponding other direction, the surface can then be shaped back, so that overall a Ziehausnehmung can be used much longer. Here, the error due to deformations should possibly even be able to resolve or minimize parts.

It is understood that the two identical pull recesses can be placed on the drawing tool at any angle, for example. This may be advantageous, for example, if you want to make an even faster change from the first Ziehausnehmung to the second Ziehausnehmung, the workpiece must be rotated only by less than 90 °. Also, this way, if necessary, further Ziehausnehmungen can be provided on a drawing tool. On the other hand, it goes without saying that the drawing recesses can also be positioned next to each other or otherwise in spatial relation to the respective drawing tool as long as it is possible to move the respective drawing recesses of the respective drawing tool into its drawing position, it being certainly advantageous if this movement takes place as simple and reliable as possible. For the latter reason, an arrangement of Ziehausnehmungen appears on a rotatable pulling tool in angles to each other or on a laterally movable drawing tool next to each other particularly advantageous.

Preferably, at least one of the drawing tools of each chain, in particular natural all drawing tools of one or preferably both chains, rotatably mounted on the tool holder and / or have at least two identical Ziehausnehmungen which are selectively engageable in a pulling position. This makes it possible to use the corresponding advantages for the corresponding drawing tools. Accordingly, the respective drawing tools can be rotated or their Ziehausnehmungen be spent in its drawing position.

Preferably, one of the drawing tools is rotatably mounted on the tool holder and has at least two different pull recesses which are selectively engageable in a pulling position. For example, workpieces of different sizes can be pulled through two different drawers. For example, between a drawing operation of a workpiece with the diameter A using the drawing tool with the diameter A and a second production process with a diameter B and the use of a drawing tool with the diameter B no costly tool change is required. Between such production processes, for example, only a 90 ° rotation of the workpiece is necessary, since the second different drawing recess rotated by 90 ° for the first drawing recess provides the appropriate diameter for the second production process. Thus, one and the same tool can serve several workpieces of different diameters or profiles, without requiring a tool change. Understandably, this entails considerable improvements in the cycle times, since the tool does not first have to be completely replaced, which could possibly even lead to a standstill of the machine.

Furthermore, a method for drawing longitudinally extending workpieces in a drawing direction along a drawing line by a drawing die by means of a caterpillar in the drawing direction behind the die with at least two circulating chains, each having at least one respective tool holder in a drawing position pulling tool have, wherein the two chains are arranged and circulate such that they are carried by pulling tools in their drawing position with a Ziehausnehmung on the workpiece to the plant, pressed against the workpiece and in this way apply tensile forces on the workpiece, characterized in that after or during the drawing of a workpiece, when the drawing tool is not pressed against the workpiece, at least one of the drawing tools is left rotated on the tool holder, so that the influence of any fatigue phenomena is minimized. By turning can quickly and reliably another area of the respective drawing tool, in particular, for example, another Ziehausnehmung or another orientation of an existing Ziehausnehmung be spent in the drawing position, so that, with appropriate process guidance, moreover, fatigue phenomena can be reduced to a minimum.

Also, a method for drawing longitudinally extending workpieces in a drawing direction along a drawing line by a drawing die by means of a caterpillar behind the die arranged in the drawing direction with at least two circumferential chains, each having at least one respective pulling tool in a drawing position bearing tool holder , Wherein the two chains are arranged and circulate in such a way that drawing tools carried by them come into abutment with the drawing workpiece on the workpiece, pressed against the workpiece and in this way apply tensile forces to the workpiece, characterized in that at least one more identical Ziehausnehmung spent at least one of the drawing tools in a drawing position in order to minimize the influence of any signs of fatigue can. In this case, the removal of the pull recesses in the respective drawing positions in any suitable manner, in particular by a move or by turning take place, as long as a change can be reliably guaranteed. Thus, here too, in the case of otherwise suitably designed process control, it is possible to minimize signs of fatigue in their influence.

It is understood that the above-mentioned advantages already occur if only a single drawing tool is designed accordingly or if only one drawing tool is correspondingly moved to other positions. In particular, it is advantageous if all drawing tools are designed accordingly, so that all drawing tools can be relieved accordingly with respect to their fatigue. Depending on the specific procedure, all drawing tools can also be moved to other positions between two drawing operations, and it is also conceivable to spend only the drawing tools which show corresponding or large fatigue phenomena correspondingly in other positions, while the remaining drawing tools are still in their position be left.

Advantageously, after or during the drawing of a workpiece, if the respective drawing tools are not pressed against the workpiece, all of the drawing tools remaining rotated at their respective tool holder or spent at least one more identical Ziehausnehmung all drawing tools in a drawing position, since then the drawing tools are not charged and turning or moving the drawing tools into another position can be implemented relatively easily and reliably.

Furthermore, a drawing tool embodied as a turntable is particularly advantageous, since a turntable with a suitable design can provide a very good force transmission between the drawing tool and the tool holder. In addition, the turntable is very easy to turn, so rotated by the least possible effort of the turntable and thus another Ziehausnehmung can be brought into position or the Ziehausnehmung can be rotated particularly easily, for example, 180 ° or 90 °. It is understood that in other embodiments, the drawing tool can also be formed in any other form.

It is also advantageous if the drawing tool can be assigned in at least one of its drawing positions a drawing line spanned by the drawing line and the component of the pressing force directed at the drawing line. Such a drawing level ensures a reliable operation of the drawing process, since the drawing tool can be used properly or can be controlled by the drawing level, whether the drawing tool is set correctly. In particular, in this case the position of the drawers with respect to the drawing line can be checked and possibly corrected. In addition, can be checked by such a drawing level, the position of the drawing plane to the dies, so that, for example, the drawing levels of the corresponding drawing tools are parallel to each other. Thus, misalignments of the drawing tools can be detected in good time and corrected if necessary.

In order to achieve a uniform application of force, the turntable can be arranged in a support recess of the tool holder which is inserted into the tool holder from a side of the tool holder arranged perpendicular to the drawing plane or can be supported on its edge. Thus, a reliable operation can be provided in a structurally simple manner, since such a support minimizes the risk of uneven force input. In particular, a very uniform support can also minimize possible wear.

Advantageously, the drawing tool is about an axis which lies in the drawing plane, rotatable or rotated about this axis, since in this way a very simple construction of the drawing tool is possible. For example, the drawing tool can thus be designed such that the axis about which the drawing tool rotates lies in the center of a circular drawing tool. Understandably, such a design of the drawing tool also provides optimum power transmission. If the axis about which the drawing tool rotates offset to the drawing level, there is a risk that the power transmission might not be optimal, which could possibly lead to a delay of the drawing tool with it.

The drawing tool can also be locked or locked to the associated tool holder by means of a locking device that is effective perpendicular to the drawing plane. This locking device can bring a stable positioning of the drawing tool with structurally simple structure with it. In particular, the drawing tool can be held in its selected drawing position by the locking device if it is not pressed against the workpiece. By opening the lock, the drawing tools can then be easily rotated or moved to other drawing positions.

Cumulatively or alternatively thereto, the drawing tool can also be held in its respective drawing position by means of a retaining device which is effective perpendicular to the drawing plane, whereby likewise a stable securing of the drawing tool can be achieved with structurally simple construction. In particular, can be reliably prevented by the holding device for a reliable release of the respective drawing tools perpendicular to the drawing level when the caterpillar train is running. According to the rotational speed then considerable centrifugal forces act on the drawing tools, which can be counteracted by the holding device. On the other hand can be ensured by opening the holding device then a simple removal of the drawing tools.

It is particularly advantageous if the locking device and the holding device comprise identical assemblies, since then the most stable possible securing of the pulling tool can be achieved with structurally simple construction, because neither the locking device nor for the holding device additionally particularly complicated assemblies are necessary is particularly advantageous. In this case, with a suitable embodiment, the locking device can ensure the position of the respective pulling tool by a spring tension, while a movement of the respective pulling tool into another pulling position or a removal of the pulling tool against the spring tension can be made possible.

In order to achieve structurally simple construction as possible, the drawing tool can have a locking and / or holding pin extending parallel to the drawing plane with a component, and the tool holder can have a corresponding locking and / or holding recess. Such a design provides for an extremely stable construction of the arrangement of drawing tool and tool holder, and this with the least possible structural effort, since a stable backup of the drawing tool can be easily ensured in its position on the tool holder by the pin and the recess.

In addition, it is particularly advantageous if the two chains are block chains. Block chains can be extremely stable and thus suitable for large forces selected so that, for example, workpieces can be drawn with relatively large dimensions, in which much higher forces are required. Block chains also allow a particularly intimate contact with any support means to be applied with end contact forces.

Preferably, the chains are block chains, which means that each of the chain links connected by links is a block. Alternatively, it is also possible for block-link chains to be used, in which blocks as well as links are used as chain links, which are connected to one another in each case by means of connecting links movable to the chain. It is conceivable to provide each chain link a plurality of tabs or even parallel to each block still provide one or more tabs on a chain link.

Also, a crawler drawing machine for drawing a longitudinally extending workpiece in a drawing direction along a drawing line by a die comprising the die and a caterpillar having at least two circumferential chains disposed behind the die in the drawing direction may each have at least one die each in a drawing position having supporting tool holder, and with pressing means for applying a contact pressure on the respective drawing tools with a directed to the drawing line component, wherein the respective drawing tool has at least one Ziehausnehmung, in its drawing position in a gripping region of the caterpillar with one of his Ziehausnehmungen on the workpiece fitting and means the pressing means is pressed against the workpiece, characterized in that the two chains are block chains and are supported in each case via a Mitlaufrollenkette of follower rollers on a respective pressing bar to the influence etwai ger to minimize fatigue. With a suitable procedure, in particular wear on both the idler rollers or on the chain links can be minimized. The latter applies in particular in demarcation against the EP 0 864 382 A1 , in which individual roller cages and no idlers or in contrast to the DE 199 47 806 A1 or the EP 0 548 723 B2 , which reveal no block chain but block link chain at this point. In this case, in particular, the combination of idler roller chains on the one hand with block chains on the other hand proves to be particularly advantageous, since a particularly uniform running of the components can be ensured each other.

Preferably, each chain link of the block chain has two tabs on one side and a tab on an opposite side, the one tab of a chain link each being located between the two tabs of an adjacent chain link and a link, preferably a bolt, passing through these three tabs is, so as to connect the chain links articulated.

Depending on the specific configuration, the bolt can then still carry chain rollers, which can engage in sprockets to drive the chain, which can ultimately ensure a particularly stable and uniform drive.

Preferably, the idler rollers extend over the entire width of the chain links and / or the Anpressbalkens, which causes a correspondingly uniform distribution of contact forces. This in turn minimizes the risk of wear.

Preferably, the follower rollers over the entire width of the chain links and / or the respective Anpressbalkens with these in contact, which accordingly allows a particularly uniform distribution of force. Accordingly, this can further reduce the risk of wear.

The block chains also make it possible to use the blocks as tool holders, which leads to a compact construction of the caterpillar track.

Advantageously, at least one of the tool holders is formed by a chain link of the chain, since such a chain link allows an extremely compact construction of the chain. In this way, in particular any transverse moments and the like, which can lead to further loads, to a minimum, since the chains can then build as compact as possible in height.

Chain rollers preferably also rest on the respective connecting links, so that the chains can be easily gripped by sprockets and driven or deflected.

The contact pressure can be applied by any known from the prior art contact pressure with which such caterpillars are provided. For example, idler rollers can circulate with, which in turn are supported against pressure beams and act on the tool holder accordingly. Likewise, correspondingly employed roller beams or support beams acting on the chain rollers can be used cumulatively or alternatively.

Through the use of block chains, in particular between rotating idler rollers and the respective chain a relatively large-area contact can be ensured, which in turn can counteract the risk of fatigue.

It is also advantageous if the two chains have a tool holder on each of their chain links. As a result, the whole chain is much more stable, since each of the chain links is loaded equally. Thus, the chain is suitable for much higher forces or allows an improved distribution of force on the workpiece. In particular, it is advantageous to combine such an arrangement with a block chain, since then a very high drawing tool density can be achieved.

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.

Figur 1

schematisch eine Seitenansicht einer Raupenzugziehmaschine;

Figur 2

einen Schnitt durch zwei Kettenglieder der Raupenzugziehmaschine nach Figur 1;

Figur 3

eine Aufsicht auf eines der Ziehwerkzeuge der in Figur 2 dargestellten Kettenglieder;

Figur 4

eine perspektivische Ansicht des Ziehwerkzeugs nach Figur 3 von schräg in dessen Ziehausnehmung;

Figur 5

eine perspektivische Ansicht des Ziehwerkzeugs nach Figuren 3 und 4 von schräg auf dessen Arretier- und/oder Haltezapfen;

Figur 6

eine Ansicht in Ziehrichtung auf ein weiteres Ziehwerkzeug;

Figur 7

eine Aufsicht auf das Ziehwerkzeug nach Figur 6;

Figur 8

eine Ansicht in Ziehrichtung auf ein weiteres Ziehwerkzeug;

Figur 9

eine Aufsicht auf das Ziehwerkzeug nach Figur 8;

Figur 10

eine perspektivische Ansicht einer der Ketten des Raupenzugs der Raupenzugziehmaschine nach Figur 1 und zugehöriger Kettenräder mit den Ziehwerkzeugen nach Figuren 8 und 9;

Figur 11

eine Ansicht in Ziehrichtung auf ein weiteres Ziehwerkzeug;

Figur 12

einen Schnitt durch ein weiteres Ziehwerkzeug entlang der Linie XII-XII in Fig. 13 bei auseinandergeschobenen Ziehbacken;

Figur 13

einen Schnitt durch das Ziehwerkzeug nach Fig. 12 entlang der Linie XIII-XIII in Fig. 12;

Figur 14

einen Schnitt durch das Ziehwerkzeug nach Fign. 12 und 13 entlang der Linie XIV-XIV in Fig. 15 bei zusammengeschobenen Ziehbacken;

Figur 15

einen Schnitt durch das Ziehwerkzeug nach Fign. 12 bis 14 entlang der Linie XV-XV in Fig. 14;

Figur 16

eine Ansicht in Ziehrichtung auf ein weiteres Ziehwerkzeug bei geschlossenen Ziehbacken;

Figur 17

eine Ansicht in Ziehrichtung auf das Ziehwerkzeug nach Fig. 16 bei offenen Ziehbacken;

Figur 18

eine Ansicht in Ziehrichtung auf ein weiteres Ziehwerkzeug bei geschlossenen Ziehbacken; und

Figur 19

eine Aufsicht auf eine handhabe des Ausführungsbeispiels nach Fig. 18.

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:

FIG. 1

schematically a side view of a crawler drawing machine;

FIG. 2

a section through two links of the crawler pulling machine after FIG. 1 ;

FIG. 3

a top view of one of the drawing tools of in FIG. 2 illustrated chain links;

FIG. 4

a perspective view of the drawing tool after FIG. 3 from obliquely into its drawing recess;

FIG. 5

a perspective view of the drawing tool after FIGS. 3 and 4 from obliquely on the locking and / or retaining pin;

FIG. 6

a view in the pulling direction on another drawing tool;

FIG. 7

a top view of the drawing tool after FIG. 6 ;

FIG. 8

a view in the pulling direction on another drawing tool;

FIG. 9

a top view of the drawing tool after FIG. 8 ;

FIG. 10

a perspective view of one of the chains of the caterpillar of the crawler belt drawing machine after FIG. 1 and associated sprockets with the drawing tools FIGS. 8 and 9 ;

FIG. 11

a view in the pulling direction on another drawing tool;

FIG. 12

a section through another drawing tool along the line XII-XII in Fig. 13 with telescopic pulling jaws;

FIG. 13

a section through the drawing tool after Fig. 12 along the line XIII-XIII in Fig. 12 ;

FIG. 14

a section through the drawing tool after FIGS. 12 and 13 along the line XIV-XIV in Fig. 15 with pushed-together dies;

FIG. 15

a section through the drawing tool after FIGS. 12 to 14 along the line XV-XV in Fig. 14 ;

FIG. 16

a view in the pulling direction on another drawing tool with closed drawing dies;

FIG. 17

a view in the pulling direction on the drawing tool after Fig. 16 with open pulling jaws;

FIG. 18

a view in the pulling direction on another drawing tool with closed drawing dies; and

FIG. 19

a view of a handle of the embodiment according to Fig. 18 ,

The crawler drawing machine 10 shown in the exemplary embodiments comprises on the upper side and underside of a drawing line 20 two chain wheels 15 around which chains 14 run. The sprockets 15 are formed in this embodiment as Kettenradpärchen, but can be configured in other embodiments, simple or with a higher number of Kettenradblättern. The chains 14 are, as in particular in FIG. 10 illustrated, formed as a block chains, wherein each of the chain links 17 of the chains 14 has two lateral tabs 17A on one end face and a central tab 17B on an opposite end face. Here are the tabs 17A of a chain link 17 on both sides of a central tab 17B of another chain link 17, wherein the two chain links 17 by a bolt 19 which connects the tabs 17A and 17B piercingly connected as a connecting member, respectively.

On the bolts chain rollers 16 are arranged in these embodiments, in which the sprockets 15 can engage to drive the chains 14 and lead.

The chain links 17 of the chains 14 are formed in these embodiments as a tool holder 30, which may possibly also carry separate tool holder in different embodiments, but this is less compact builds. The tool holders 30 then carry drawing tools 40, which can interact with a workpiece 11, which is to be pulled, pulling.

The arrangement of the chains 14 and the sprockets 15 forms a caterpillar 13. Between the two chains 14 is the drawing line 20. Along the drawing line 20, the workpiece 11 can be pulled in the drawing direction 21 by means of the caterpillar 13 through a die 12, whereby the crawler tractor 10 can fulfill their basic task.

In order to apply the drawing forces through the die 12 in the drawing direction 21, the caterpillar train 13 pressing beam 82, on which follower rollers 80, which are each connected to follower roller chains 81, can run off, which in turn run with the chain links 17 of the chains 14 by they run on the side of the chain links 17, which are remote from the drawing tools 40. In this way, a directed onto the drawing line 20 component 22 of a contact force can be applied in a gripping region 18.

In present embodiments, the idler roller chains 81 run between the sprocket pairs of the sprockets 15. In different embodiments, each shorter follower roller chains 81 may be provided, each circulating in front of the sprockets 15.

By the chains 14 and the drawing line 20, a drawing level 23 can be defined, which is parallel to the circulating chains 14 and the drawing line 20 cuts. Perpendicular to this drawing level 23, another plane 25 can be defined which also intersects the drawing line 20. The two chains 14 are then arranged above and below or on both sides of this plane 25.

How directly the FIG. 2 The follower rollers 80 of the two follower roller chains 81 each extend parallel to the plane 25 over the width of the chain links 17 and the tool holder 30 and the respective pressure beam 82. They are also over the entire width within the necessary tolerances and measurement accuracies with these in Contact, so that a very gentle force distribution can be ensured. This is ensured in particular by the use of block chains as chains 14 and by the use of idler roller chains 81 to guide the idler rollers 80.

The drawing tools 40 can be found on a side 31 of the respective tool holder 30 arranged perpendicular to the drawing plane 23. This side 31 of the tool holder 30 faces the plane 25 in each case.

In the exemplary embodiments illustrated here, the chain links 17 secure the drawing tool 40 by means of a locking device 50 or by means of a holding device 60.

So are the in FIGS. 1 to 10 illustrated embodiments, the drawing tools 40 via a bolt 34 which engages in a locking recess 52 of a locking pin 51 and a retaining recess 62 of a retaining pin 61 in position. For this purpose, the bolt 34 is pressed with a spring 36 against a locking surface 45 and behind a Haltehinterschneidung 46, which are each provided on the locking pin 51 and the retaining pin 61, so that the drawing tool on the one hand by the contact pressure against the locking surface 45 in his Rotary position with respect to the tool holder 30 is secured and is prevented by the retaining undercut 46 also from leaving the tool holder 30.

The bolt 34 is connected to a handle 35, by which it can release the Haltehinterschneidung 46 against the spring force of the spring 36. This makes it possible to remove the pulling tool 40 as needed. A rotation of the respective pulling tool is already possible with a suitable choice of the spring force of the spring 36 without operating the handle 35, but can be facilitated by an actuation of the handle 35.

So that the spring 36 is biased, this is held by means of a securing cover 37 which is fixedly inserted into a receptacle 38 for the bolt 34 and the spring 36.

At the in FIGS. 1 to 10 illustrated embodiments, the locking pin 51 and retaining pin 61 are aligned along an axis 24 which lies in the drawing plane 23. As can be seen immediately in these embodiments, the locking device 50 and the holding device 60 realized by identical or double-acting assemblies, which is structurally a simple and compact solution.

The drawing tools 40 of all embodiments have drawing recesses 41, which can interact with the respective workpieces 11 and are adapted to the respective workpieces 11 in a suitable manner known per se.

Here are the drawing tools of the embodiment according to FIGS. 1 to 10 and 12 to 15 formed as a turntable 42, each having a support lug 44, by means of which the turntable 42 at the edge 33 of a support recess 32 of the tool holder 30th can support. This allows a particularly uniform support, which can reduce the fatigue of each material.

To turn the turntable 42 easy, they have in the embodiments of the FIGS. 1 to 10 each actuating holes 43, in which a rotary lever can be used as needed to facilitate rotation. According to devices may possibly also in the in FIGS. 12 to 15 illustrated embodiment may be provided.

As can be seen immediately, the in FIGS. 2 to 5 illustrated embodiment, a pulling tool 40 with only one Ziehausnehmung 41. By rotating the drawing tool 40 through 180 °, the direction of action between the drawing tool 40 and the workpiece 11 or the tool holder 30 can be changed, which in turn reduces fatigue phenomena. This is also in the embodiments according to FIGS. 6 to 9 possible, in each case two Ziehausnehmungen 41 are provided. A rotation of 90 ° allows a change between the Ziehausnehmungen 41, wherein the in FIGS. 6 and 7 illustrated embodiment, the Ziehausnehmungen 41 are formed identically, which allows even more action against fatigue, while the Ziehausnehmungen 41 at the in FIGS. 8 and 9 illustrated embodiment are formed differently, so that in this also different workpieces 11 can be pulled or arranged.

This in FIG. 11 illustrated embodiment includes a laterally displaceable along the plane 25 drawing tool 40 with two identical Ziehausnehmungen 41, which is held laterally displaceable over a guide rail 39 in the tool holder 30. About a locking and retaining pin 71 which is provided with a handle 35, a locking and retaining ball 73 can be released from a locking and retaining hole 72 by a recess 74 of the locking and retaining pin 71 of the locking and retaining ball 73 as Retreat option is provided. The drawing tool 40 can then be displaced laterally and possibly even removed from the tool holder 30. As with the in FIGS. 6 and 7 illustrated embodiment can be changed between two identical Ziehausnehmungen 41 so as to relieve the drawing tool 40.

Divided pulling jaws 47 allow the in FIGS. 12 to 19 illustrated embodiments, a change in Ziehausnehmungen 41 in order to adapt to different workpieces 11 can. For this purpose, the drawing jaws 47 of in FIGS. 12 to 15 illustrated embodiment by means of an eccentric rotary guide 48 mounted in a bearing body 49, which in turn has a locking and retaining pins 51, 61 in order to rotate the entire assembly by 180 °, which in turn serves to relieve the drawing tool 40. By contrast, by an offset rotation of the individual pulling jaws 47, their spacing can be varied.

At the in FIGS. 16 to 19 illustrated embodiments, two pulling jaws 47 are held laterally or parallel to the plane 25 displaceable in the tool holder 30 by means of guide rails 39. For locking springs 36 are mounted in spring holders 75, which press spacer 76 in the direction of the plane 25. At the in FIGS. 16 and 17 illustrated embodiment, the spacers 76 must be manually pressed against the springs 36 to move the drawing jaws 47 laterally. At the in FIGS. 18 and 19 illustrated embodiment, this serves a handle shaft 77 with a cam 79 which can be actuated by lever 78. Depending on the specific implementation, the spacers can serve both as described above a lock and a holder by also prevent lateral removal of the pulling jaws 47 from the guide rail 39 out or can allow. LIST OF REFERENCE NUMBERS 10 Raupenzugziehmaschine 11 workpiece 40 drawing tool 12 die 41 Ziehausnehmung 13 caterpillar 42 turntable 14 Chain 43 operation bore 15 Sprocket 44 supporting extension 16 chain roller 45 locking surface 17 link 46 Haltehinterschneidung 17A flap 47 pulling jaw 17B flap 48 eccentric rotation guide 18 Griffin area 49 bearing body 19 bolt 50 locking device 20 drawing line 51 lock pin 21 drawing direction 52 locking recess 22 directed to the drawing line 20 component of the contact pressure 60 holder 23 draw level 61 retaining pins 24 axis 62 holding recess 25 perpendicular to the drawing plane 23 directed plane 71 Locking and retaining bolts 72 Locking and retaining hole 30 toolholder 73 Locking and holding ball 31 perpendicular to the drawing surface 23 arranged side of the tool holder 30th 74 recess 75 Pen holder (numbered as an example) 32 supporting recess 76 Spacers (numbered as an example) 33 Edge of the support recess 32 34 bolt 77 Handle shaft 35 handle 78 lever 36 feather 79 cam 37 fuse cover 38 Support for bolt 34, spring 36 or securing cover 37 80 idler 81 Mitlaufrollenkette 39 guide rail 82 clamping bar

Claims (15)

A crawler drawing machine (10) for drawing a longitudinally extending workpiece (11) in a drawing direction (21) along a drawing line (20) through a die (12) comprising the die (12) and a drawing direction (21) behind the die (10). 12) arranged caterpillar train (13) with at least two circumferential chains (14), each having at least one respective pulling tool (40) in a drawing position bearing tool holder (30), and with pressing means for applying a contact pressure on the respective drawing tools (40) with a component (22) directed towards the drawing line (20), wherein the respective drawing tool (40) has at least one drawing recess (41) in its drawing position in a gripping region (18) of the caterpillar train (13) with one of its drawing recesses (41) on the workpiece (11) and is pressed by means of the pressing means to the workpiece (11), characterized in that at least one of the drawing tools (40) rotatable on the tool holder (30) r is fixed and / or at least two identical Ziehausnehmungen (41), which are selectively brought into a drawing position. A crawler drawing machine (10) according to claim 1, characterized in that at least one of the drawing tools (40) is rotatably mounted on the tool holder (30) and has at least two different drawing recesses (41) selectively engageable in a drawing position. A method for drawing longitudinally extending workpieces (11) in a drawing direction (21) along a drawing line (20) by a die (12) by means of a crawler (13) arranged in the drawing direction (21) behind the die (12) with at least two Circumferential chains (14), each having at least one tool holder (30) each carrying a pulling tool (40) in a drawing position, the two chains (14) being arranged and circulating in such a way that the drawing tools (40) carried by them are in their position Pulling position with a Ziehausnehmung (41) on the workpiece (11) come to rest, pressed against the workpiece (11) and in this way apply tensile forces on the workpiece (11), characterized in that after or during the drawing of a workpiece (11 ), if that Pulling tool (40) is not pressed against the workpiece (11), at least one of the drawing tools (40) on the tool holder (30) remaining rotated and / or at least one further identical Ziehausnehmung (41) of at least one of the drawing tools (40) in a drawing position is spent. A drawing method according to claim 3, characterized in that after or during the drawing of a workpiece (11), when the respective drawing tools (40) are not pressed against the workpiece (11), all of the drawing tools (40) remain rotated on their respective tool holder and / or at least one further identical drawing recess (41) of all drawing tools (40) is brought into a drawing position. A crawler drawing machine (10) according to claim 1 or 2 or drawing method according to claim 3 or 4, characterized in that the drawing tool (40) is designed as a turntable (42). A crawler drawing machine (10) according to any one of claims 1, 2 and 5 or drawing method according to any one of claims 3, 4 and 5, characterized in that the drawing tool (40) in at least one of its drawing positions by the drawing line (20) and on the drawing line (20) directed component (22) of the pressing force spanned drawing level (23) can be assigned. A crawler drawing machine (10) according to claim 6 and any one of claims 1, 2 and 5 or drawing method according to claim 6 and any one of claims 3, 4 and 5, characterized in that the turntable (42) extends in a direction perpendicular to the table Ziehebene (23) arranged side (31) of the tool holder (30) in the tool holder (30) introduced supporting recess (32) of the tool holder (30) is arranged or at its edge (33) is supported. Raupenzugziehmaschine (10) according to claim 6 and any one of claims 1, 2, 5 and 7 or drawing method according to claim 6 and any one of claims 3, 4, 5 and 7, characterized in that in that the pulling tool (40) about an axis (24) lying in the drawing plane (23) is rotated or is rotated. A crawler drawing machine (10) according to claim 6 and any one of claims 1, 2, 5, 7 and 8 or drawing process according to claim 6 and any of claims 3, 4, 5, 7 and 8, characterized in that the drawing tool (40 ) by means of a perpendicular to the drawing plane (23) effective locking device (50) on the associated tool holder (30) is locked or locked. A crawler drawing machine (10) according to claim 6 and any one of claims 1, 2, 5 and 7 to 9 or drawing method according to claim 6 and any of claims 3, 4, 5 and 7 to 9, characterized in that the drawing tool (40 ) is held in its respective drawing position by means of a retaining device (60) which is active perpendicular to the drawing plane (23). Crawler drawing machine (10) or drawing method according to claims 9 and 10, characterized in that the locking device (50) and the holding device (60) comprise identical assemblies. A crawler drawing machine (10) according to any one of claims 1, 2 and 5 to 11 or drawing method according to any one of claims 3, 4 and 5 to 11, characterized in that the drawing tool (40) extends with a component parallel to the drawing plane (23). extending locking and / or retaining pin (51, 61) and the tool holder (30) has a corresponding locking and / or retaining recess (52, 62). A crawler drawing machine (10) according to any one of claims 1, 2 and 5 to 12 or drawing method according to any one of claims 3, 4 and 5 to 12, characterized in that the two chains (14) are block chains. A wire drawing machine (10) according to any one of claims 1, 2 and 5 to 13 or drawing method according to any one of claims 3, 4 and 5 to 13, characterized in that at least one of the tool holders (30) by a chain link (17) of the chain (17) 14) is formed. A crawler drawing machine (10) according to any one of claims 1, 2 and 5 to 14 or drawing method according to any one of claims 3, 4 and 5 to 14, characterized that the two chains (14) at each of its chain links (17) having a tool holder (30).

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