Radial press

Abstract

The invention relates to a radial press having at least six base jaws (8) which are arranged uniformly and concentrically about a pressing axis (X) and which can be moved radially in the direction of the pressing axis (X) and away from the pressing axis by means of a drive unit and each have a bearing surface (9) radially inside and a mechanical holding device for pressing jaws which can be mounted thereon in an exchangeable manner, the cutting tool (11) is accommodated in a tool mounting space defined outwardly by the base claws (8). The cutting device comprises a plurality of cutting accessories (12) which are respectively arranged on a base claw (8) and respectively comprise a base structure (13). The at least one cutting attachment (12) further comprises a cutting structure (14). The base structures (13) each have a bearing surface which rests on the bearing surface (9) of the corresponding base claw (8), and at least one engagement element which interacts with the mechanical holding device of the corresponding base claw (8). The at least one cutting structure (14) protrudes from the corresponding base structure (13) in the direction of the pressing axis (X) and has a cutting edge away from the supporting surface of the corresponding base structure (13).

Description

[0001] The invention relates to a radial press having at least six base jaws arranged uniformly and concentrically around a pressing axis, which can be moved radially in the direction of the pressing axis and away from the pressing axis by a drive unit, wherein the base jaws each have a support surface radially inwardly and a mechanical retaining device for a pressure jaw that can be replaceably mounted thereon.

[0002] Radial presses are suitable for any radial pressing operation (eg, permanently attaching connectors to pipes at the end to produce hydraulic lines) and are known in various versions (eg, hollow piston presses, platen presses and yoke presses) and in a variety of designs. For example, refer to the following documents: DE 20 2016100 660U1,DE 20 2016 008 097 U1,DE 10 2016 106 650 A1,DE 10 2014 014585B3,DE 10 2014 012 485 B3,DE 10 2014008 613 A1,DE 10 2011 015 770A1,DE 10 2011 015 654 A1,DE 10 2009 057 726 A1,DE 10 2005 041 487 A1,DE 10 2005 034 260B3,DE 601 21 915T2,DE 298 24 688U1, DE 199 44 141C1, DE 199 40 744B4, DE 101 49 924A1, DE 41 35 465A1 and DE 35 13129A1. Regardless of their respective structures and other technical features, the known radial presses have in common that a plurality of base jaws (most often eight base jaws) which are uniformly distributed around the pressing axis and have a wedge-shaped cross section are uniformly moved radially in the direction of the pressing axis by a (usually hydraulic) drive device. In this case, the pressing jaws can be placed radially inwardly on the base jaws, and the pressing jaws have a pressing surface adapted to the geometry (especially the diameter) of the workpiece to be pressed.

[0003] Radial presses of the type described here involve high investment costs. This is especially true for modern high-precision, high-performance presses. The associated purchase costs can be a heavy financial burden, especially for workshops and similar small organizations that use radial presses of the type described here.

[0004] Against this background, the object of the present invention is to increase the economic efficiency associated with a radial press described here.

[0005] The above mentioned technical problem is solved by a radial press of the type mentioned at the outset, wherein a cutting tool is accommodated in a tool receiving space delimited outwardly by the base jaws, which has the following features:

[0006] - The cutting tool comprises a plurality of cutting attachments respectively mounted on the base jaws;

[0007] - the cutting attachments each comprise a base structure, and at least one of them further comprises a cutting structure;

[0008] - the base structure has a respective support surface resting on a bearing surface of the corresponding base jaw and also has at least one snap-in element interacting with the mechanical retaining device of the corresponding base jaw;

[0009] At least one cutting structure projects from the corresponding base structure in the direction of the extrusion axis and has a cutting edge facing away from the supporting surface of the corresponding base structure.

[0010] The invention is therefore based on the realization that a radial press of the type described here can also be used to perform tasks for separating (cutting) workpieces when equipped with a special cutting tool adapted to the technical characteristics of the radial press. Workshops and similar small organizations that use a radial press of the type described here can use very significant efficiency-enhancing effects in this way. The utilization rate of the radial press can be greatly increased, because in a typical workshop, various demanding cutting operations are carried out, which can be performed by the radial press prepared according to the invention. The increase in economic efficiency is also due to the fact that, in an ideal case, the purchase of a special, clear separation or cutting machine (or even a plurality of such devices) can be avoided. This also avoids the space requirements that would otherwise exist; in the absence of a special, clear separation or cutting machine, the maintenance and service costs associated therewith are also avoided.

[0011] Within the scope of the invention, there is a great deal of room for design in the realization of the cutting tool, that is, in particular the realization of the cutting attachment attached to the base jaws of the radial press. Its structural and constructional design can be optimized with respect to the corresponding separation task, as described below, taking into account the functional and structural features of the corresponding radial press concept, wherein the radial press can be flexibly adapted to the corresponding separation task with the least possible effort, thanks to the fact that the radial press in its basic design is already designed to a certain extent "from the ground up" for equipping different pressure jaws.

[0012] In a first preferred embodiment of the invention, the cutting attachment facing the extrusion axis and opposite the cutting structure of the other cutting attachment has a matching retaining structure with a workpiece support surface. In a particularly simple structural embodiment of this improved design, the cutting tool inserted into the tool installation space accordingly comprises exactly two cutting attachments, which are arranged on two base jaws diametrically opposite each other. One of the two cutting attachments has a cutting structure and the other opposite has a matching retaining structure. During operation of the radial press, the cutting edge of the cutting structure separates the workpiece supported on the workpiece support surface of the matching retaining structure, wherein the workpiece support surface of the matching retaining structure is usually adapted in terms of its geometry to the geometry of the cutting edge and, if necessary, also to the workpiece.

[0013] The matching holding structure can here protrude from the corresponding base structure in the direction of the extrusion axis. However, in an extreme case, the matching holding structure can be part of the base structure in that the workpiece support surface is formed by the surface of the base structure of the relevant cutting attachment facing the extrusion axis.

[0014] Another preferred improved design feature of the present invention is that at least two cutting attachments (each protruding from a corresponding base structure in the direction of the extrusion axis) have a cutting structure, whose cutting edges act in a cutting manner on each other. As such a cutting action leading to the severance of the corresponding workpiece, shearing is particularly considered here. For this purpose, in a corresponding particularly preferred design of this improved design, the cutting edges of the two cutting attachments are arranged parallel to each other (in a direction transverse to the direction of movement of the cutting attachments with respect to each other); when the cutting edges are oriented perpendicular to the extrusion axis, they are therefore offset parallel to each other in the direction of the extrusion axis. During the closing movement of the radial press, a shearing action is exerted on the workpiece due to the above-mentioned parallel offset of the cutting edges.

[0015] However, for the various separation tasks that are to be carried out by the radial press prepared according to the invention, pinching rather than shearing is preferred as the cutting action for separating the respective workpieces. For this purpose, in a particularly preferred alternative design, the cutting structures have mutually corresponding cutting edges that are opposite to each other in the direction of movement of the cutting attachments relative to each other, i.e. in the plane of movement. The cutting edges of the cutting structures of the two cutting attachments correspond to each other in this sense if, at the end of the radial movement of the base jaws oriented in the direction of the pressing axis, they (ideally) touch each other along a contact line or, for example, depending on the material of the workpiece to be separated, are opposite to each other along its extension at a minimum distance (e.g. 0.2 mm).

[0016] In a preferred embodiment of such a cutting attachment with cutting edges designed corresponding to each other, the cutting edges ideally touch each other linearly when the cutting tool is completely closed, and the relevant ideal contact line can be a straight line through the straight line design of the two cutting edges. However, this is not necessary. Depending on the application to be carried out, it is also conceivable that the cutting edge geometry differs from a straight line in one or two dimensions, which is explained in detail below, and this also applies to the two mutually offset cutting edges of the corresponding cutting tool (see above) that cause the workpiece to shear, in order to produce an uneven cut. By designing the cutting edges of the cutting attachment in such a way that they correspond to each other and face each other in the relative movement direction of the cutting attachment, it is possible to avoid reaction forces that act on the base jaws supporting the cutting attachment in an asymmetrical manner, that is, in particular in the direction of the extrusion axis, which are offset from each other, which are different from the case of cutting edges that are offset from each other and cause the workpiece to shear. This can be of great practical importance, because various typical radial presses of conventional design will produce greater wear and thus shorten their service life when subjected to such asymmetrical loads. This has adverse consequences for the current task of improving economy.

[0017] Another great practical advantage of this design is that, for separating the workpieces, not only two cutting structures can be used, as in shearing, but in particular also three (for example in radial presses with six base jaws) or four cutting structures (for example in radial presses with eight base jaws). In this case, the cutting edges can preferably be bent in each case with a pronounced tip, specifically, for example, with an angle of 120° in the case of three cutting structures and with an angle of 90° in the case of four cutting structures. In designs characterized by the presence of more than two cutting structures, not only is the workpiece prevented from deflecting during separation and the (pointed) cutting edge is facilitated to enter the workpiece; a more uniform application of force and a more favorable force flow in the radial press are also advantageous, especially in the case of radial presses with hollow pistons or pressure plates.

[0018] To avoid misunderstandings, it should be pointed out again as a precaution that the above-mentioned cutting edges which are opposite to each other in the cutting plane do not necessarily touch each other at the end of the cutting movement, or even do not touch each other over the entire length. Rather, for different separation tasks, i.e. for the separation of different workpieces, a design is advantageous in which the cutting edges are kept at a distance from each other or define a free space between them (if necessary over part of their length) which is designed appropriately for the respective workpiece (e.g. circular, elliptical or polygonal). It should also be pointed out that the base jaws with the cutting attachments do not necessarily move synchronously; although this is appropriate in most applications of the invention, it is entirely conceivable in individual cases with a suitable design of the drive unit (e.g. by means of individually controlled individual drives) for the base jaws to move radially in a predeterminable sequence which is offset in time to each other (if necessary overlapping each other).

[0019] According to another preferred development of the invention, the support surface of the base jaws and the support surface of the base structure of the cutting attachment are cylindrically curved in correspondence with one another. This can facilitate the self-adjusting or self-locking support of the cutting attachment on the respective base jaws, in that the transverse forces generated during the cutting process can be better transferred to the base jaws, which can help to relieve the pressure of the retaining device-seating element pair for securing the position of the cutting attachment. In addition, this design also facilitates a favorable force flow while reducing harmful stress peaks. It is particularly preferred here that the base structure of the cutting attachment protrudes beyond the respective base jaw in the circumferential direction.

[0020] These projections (at least partially) form a cover for the gap produced between the relevant base jaw and two adjacent base jaws, thereby reducing the risk of workpiece fragments or other fragments produced during the cutting process entering the relevant gap.

[0021] According to another preferred embodiment of the invention, the above effect is particularly effective when two cutting attachments are arranged on the base jaws arranged vertically one above the other. This arrangement of the cutting attachments also facilitates operation when using the radial press prepared according to the invention, because the workpiece to be cut can be placed on the cutting edge of the lower cutting attachment as necessary, which relieves the operator and allows particularly precise incision guidance.

[0022] In conjunction with the above-described arrangement of the cutting attachments stacked vertically one above the other, but also due to the inherent statics of the relevant machine design and its own characteristic force flow, the invention is very particularly preferably implemented in a radial press designed as a so-called yoke press, i.e. in a radial press with a lower yoke and an upper yoke, wherein the vertical distance between the lower yoke and the upper yoke can be varied by at least one drive element (designed, for example, as a hydraulic cylinder). In this case, particularly high cutting forces can be achieved when implementing the invention. This applies in particular when the cutting attachments are mounted on two base jaws, which are arranged in a fixed position relative to the lower yoke or the upper yoke.

[0023] According to another preferred development of the invention, the cutting tool comprises two wall elements extending essentially parallel to the extrusion axis, which laterally delimit the (intermediate) space between the two base structures when the cutting tool is closed. As a result, at least over a partial range of the cutting movement of the two cutting attachments relative to one another, the region in which the workpiece to be cut is severed is closed in the lateral direction. This also (see above) helps to reduce the risk of workpiece fragments or other fragments generated during the cutting process entering the gap generated between the relevant base jaw and two adjacent base jaws. In the vertical cutting direction, the above-mentioned wall elements are particularly preferably arranged on the base structure of the lower cutting attachment or form part of it.

[0024] Irrespective of their detailed geometry (straight line or one or two dimensions different from a straight line; see above), it is particularly preferred for various typical applications for the invention that the two cutting edges are oriented at least substantially transversely to the extrusion axis. Loads that lead to asymmetrical stress curves (potentially damaging the service life of the radial press) are thereby avoided as much as possible. In addition, this design of the cutting tool allows workpieces (such as hoses, rods, tubes, bars, chain links, etc.) inserted therein by an orientation parallel to the extrusion axis to be cut with a minimum cutting surface and thus optimally in terms of force. For optimal results in other applications (such as expansion tubes, sleeves, nuts, etc.), it is advantageous to orient the two cutting edges at least substantially parallel to the extrusion axis, regardless of their detailed geometry (straight line or one or two dimensions different from a straight line; see above). For other applications, it has been shown to be advantageous to orient the cutting edges obliquely to the extrusion axis. Against this background, a particularly preferred design of the invention is characterized in that the cutting structure can be adjusted to the corresponding base structure with respect to the orientation of the respective cutting edge.

[0025] According to another preferred improved design of the present invention, the cutting tool has a linear guide element, which can guide the two base structures relative to each other by relative movement perpendicular to the extrusion axis. Through the linear guide element implemented in the cutting tool itself, the reaction force or force component (lateral force) that occurs during cutting and acts in a direction transverse to the cutting direction between the two cutting edges is returned to the inside of the cutting tool itself. The lateral force acting on the base jaws of the radial press is avoided by this direct, closed internal force flow in the cutting tool. This in turn has a very important effect on the service life of the radial press. The linear guide element extending between the two base structures and coupling them to each other in a linearly guided manner can also guide the workpiece when necessary, or guide the two workpiece parts after the workpiece is cut.

[0026] According to another development of the invention, it is particularly advantageous for operating the radial press provided according to the invention, in particular for carrying out the separation task with good reproducibility, if the cutting tool has at least one workpiece receptacle arranged in the region of the end side of the base structure. Such a workpiece receptacle can be arranged in particular replaceably on the corresponding base structure, which allows the cutting tool to be specially adapted to the various separation tasks or workpieces with less effort, which is conducive to improving reproducibility. According to a particularly preferred design, the workpiece receptacle (which can be replaced if necessary on the corresponding base structure) is designed as a spindle; this is very advantageous, for example, when breaking chains, if the chain links of the chain to be broken are hung on the spindle. If the spindle is at a distance from the two cutting edges, so that it is not the chain link to be broken itself that is hung, but the chain link that is farther away from it, the spindle helps to hold the relevant section of the broken chain after cutting and prevent it from falling. This is also advantageous from the perspective of work protection.

[0027] According to an alternative preferred embodiment, substantially similar positive effects can be achieved in that the workpiece holder (which is optionally replaceably mounted on a corresponding base structure) is designed as a plate with a recess, wherein the recess is dimensioned such that a chain link adjacent to the chain link to be separated is inserted therein.

[0028] According to another very advantageous development of the invention, a centering and / or holding attachment is mounted on at least two further base jaws of the radial press, which has a workpiece holder that is axially offset relative to the cutting structure of the cutting tool. It is particularly preferred that the centering and / or holding attachment is designed to be retractable so that the workpiece support surface of the workpiece holder can reduce its distance from the corresponding base jaw relative to the preload force. When the radial press is closed, that is, when the base jaws are (preferably synchronously) moved radially in the direction of the pressing axis, the workpiece holder of the centering and / or holding attachment rests on the workpiece to be cut shortly before or after the cutting edge of the cutting tool is arranged on the workpiece; it thereby positions the workpiece during (further) cutting and prevents deviation or slippage, which contributes to a clean cut guide. Another very advantageous effect of the centering and / or holding attachment is that it can still hold the relevant section of the workpiece to be cut or cut even after cutting and prevent it from falling and / or ejecting from the cutting tool. This is again very advantageous from the perspective of work protection.

[0029] The following is a more detailed explanation of different preferred embodiments of the present invention with reference to the accompanying drawings.

[0030] Figure 1 The relevant area of ​​a first embodiment of a radial press prepared according to the invention is shown from the front / operator's perspective,

[0031] Figure 2 Enlarged view showing the open position Figure 1 A cutting tool for a radial press, which is accommodated in a tool mounting space and includes two cutting attachments,

[0032] Figure 3 Shown in closed position Figure 1 and Figure 2 The cutting tool of the radial press is accommodated in the tool mounting space,

[0033] Figure 3a A modification of the cutting tool according to the first embodiment is shown,

[0034] Figure 4 A cutting tool according to a second embodiment of the invention is shown in a perspective view in a closed position, which is accommodated in a tool mounting space of a radial press and comprises four cutting attachments,

[0035] Figure 5A three-dimensional diagram showing Figure 4 One of the four cutting attachments for the cutting tool,

[0036] Figure 6 Shown through the Figure 4 Axial section of the cutting tool,

[0037] Figure 7 A cutting tool according to a third embodiment of the invention, which is accommodated in a tool mounting space of a radial press and comprises two cutting attachments and two centering and holding attachments, is shown in a perspective view in a closed position,

[0038] Figure 8 Shown in half section Figure 7 Cutting tools,

[0039] Fig. 9 A cutting tool according to a fourth embodiment of the invention is shown in a perspective view in a closed position, which is accommodated in a tool mounting space of a radial press,

[0040] Fig.10 Shown through the Fig. 9 Axial section of the cutting tool,

[0041] Fig.11 Shown through the Fig. 9 and Fig.10 The cutting tool is relative to the Fig.10 The axial section is parallel to the offset vertical section,

[0042] Fig.12 A cutting tool according to a fifth embodiment of the invention is shown in a perspective view in a closed position, which is accommodated in a tool mounting space of a radial press,

[0043] Fig.13 A cutting tool according to a sixth embodiment of the invention is shown in a perspective view in a closed position, which is accommodated in a tool mounting space of a radial press,

[0044] Fig.14 A cutting tool according to a seventh embodiment of the invention is shown in a perspective view in a partially closed position, accommodated in a tool mounting space of a radial press.

[0045] The radial press designed as a yoke press as the basis of the various embodiments of the invention described in the figures is comparable to the relevant prior art familiar to the relevant technical personnel. Specifically, the invention is described here based on the radial press HM325 of Uniflex-Hydraulik GmbH, 61184 Karben (Germany).

[0046] The radial press in question comprises a base 1, a lower yoke 2 fixed relative to the base, and an upper yoke 3 which can be moved vertically up and down relative to the lower yoke 2. For this purpose, the upper yoke 3 is movably guided in two guide rails 4 extending from the base 1. Also visible are the upper ends 5 of two hydraulic drive cylinders 6 which are part of a drive unit in a known manner and which can bring about a relative movement of the upper yoke 3 and the lower yoke 2 relative to one another. Also visible is an operating unit 7 which is used, among other things, to set up the radial press by calling up a pressing program running in the machine control and its special adaptation.

[0047] The radial press has in a known manner eight base jaws 8 arranged uniformly and concentrically around the pressing axis X, which can be moved synchronously radially in the direction of the pressing axis X when the upper yoke 3 is lowered and radially away from the pressing axis X when the upper yoke 3 is raised, due to the relative movement of the upper yoke 3 and the lower yoke 2. The base jaws 8 each have a cylindrically curved support surface 9 on the radial inside for a pressure jaw that can be replaced thereon. In addition, the base jaws 8 (inside) include mechanical retaining devices in the form of spring-loaded retaining pins, which, when the pressure jaws are arranged on the corresponding base jaws 8, snap into a locking manner into corresponding grooves of retaining bolts arranged radially on the outside on the corresponding pressure jaws and inserted into holes 10 in the base jaws 9. Since the radial press used in this embodiment corresponds to the known prior art mentioned in the above scope, no further explanation is given.

[0048] According to the first embodiment of the present invention, Figures 1 to 3 The radial press is equipped with a cutting tool 11. It is accommodated in a tool installation space defined outwardly by the base jaws 8. It includes two cutting attachments 12 mounted on the base jaws 8 opposite to each other, namely a first cutting attachment 12.1 mounted on the lower base jaw 8.1 "(6 o'clock base jaw") (fixed relative to the lower yoke 2), and a second cutting attachment 12.2 mounted on the upper base jaw 8.2 ("12 o'clock base jaw") (fixed relative to the upper yoke 3).

[0049] Each of the two cutting attachments 12.1, 12.2 comprises a base structure 13 and a cutting structure 14. The base structure 13 here has a supporting surface 15 which is in contact with the supporting surface 9 of the corresponding base jaw 8 and is cylindrically curved correspondingly thereto (see Figure 4 ); it also includes (similar to the pressure jaws determined for radial presses) a snap-in element that cooperates with the mechanical retaining device of the corresponding base jaw 8, in the form of a retaining pin 16 that enters the hole 10 of the corresponding base jaw 8 (see Figure 4 The base structure 13 of the cutting attachment 12 protrudes circumferentially beyond the corresponding base claws 8 (see Figure 2 and Figure 3); therefore, when the radial press is closed (and therefore the cutting tool 11 is closed), it covers the gap 17 existing between the associated base jaw 8 carrying the cutting attachment 12 and two adjacent base jaws (see Figure 3 ).

[0050] The cutting structures 14 each extend from the base structure 13 of the respective cutting attachment 12 in the direction of the extrusion axis X. The cutting structure is prismatic in design and has a base region 14A with wall segments 18A oriented parallel to one another and a cutting region 14B with wall segments 18B intersecting one another at an acute angle. In this case, the cutting edges 19 of the last wall segments 18B each define a blade-like cutting edge 20. The cutting edges 20 of the two cutting attachments 12 are opposite one another in the relative movement direction B of the cutting attachments 12, i.e. in the movement plane of the cutting structure 14. They correspond to one another in that they are in contact with one another when the radial press is closed ( Figure 3 ) are in contact with each other (ideally) along a contact line. Due to the corresponding alignment of the cutting structure 14, the cutting edge 20 is (also) oriented transversely to the extrusion axis X.

[0051] The cutting structures 14 are made of hardened steel. They are attached to the respectively corresponding base structure 13 (via a conventional pin connection). This allows the cutting structures 14 removed from the base structure 13 to be reworked or replaced in the event of wear or tear. In addition, if the base structure 13 is designed appropriately, it is also possible to adjustably attach the cutting structures 14 thereto, at different angles, for example at an angle of 30°, 45° and / or 60° to the extrusion axis X or parallel thereto.

[0052] In accordance with Figures 1 to 3 In the embodiment of the present invention, the cutting tool 11 also has a linear guide element 21, which is used to guide the two base structures 13 relative to each other by relative mobility perpendicular to the extrusion axis X, that is, in the direction of movement B. The linear guide element 21 is designed in the form of four guide pins 22, which are fixedly connected to the base structure 13 of the lower, first cutting attachment 12.1 and enter corresponding guide holes 23 designed in the base structure 13 of the upper second cutting attachment 12.2 when the radial press is closed (see Fig.11 ).

[0053] In the cutting tool 11 according to the first embodiment Figure 3a In the variant shown in , the cutting tool 11 also comprises two wall elements 24 extending substantially parallel to the extrusion axis X and arranged transversely on the base structure 13 of the lower first cutting attachment 12.1, which laterally define the intermediate space between the two base structures 13 when the cutting tool 11 is closed. In addition, the cutting tool 11 is arranged according to Figure 3aA workpiece receptacle 26 (in the form of a workpiece receptacle with a workpiece W (see FIG. 1 ) is replaceably arranged on the base structure 13 of the first cutting attachment 12.1 in the region of the end side 25 facing the operator. Figure 1 ) of the plate 28 of the groove 27).

[0054] according to Figures 4 to 6 The second embodiment shown (only in the area of ​​the cutting tool 11), with Figures 1 to 3 Unlike the cutting tool shown, the cutting tool 11 equipped with the radial press according to the first embodiment does not have two cutting attachments 12, but four. The base structure 13 is basically equivalent to that of the first embodiment. The cutting structure 14' is designed completely differently. They are each designed with a bent cutting edge 20', wherein the two sections of each cutting edge 20' converge at a tip 29 at an angle of 90°. Figure 6 It can also be seen that the cutting angle here (approximately 45°) is significantly smaller than the cutting angle of the cutting tool 11 according to the first exemplary embodiment.

[0055] When using such a cutting tool 11 , it is conceivable that the four cutting attachments 12 are arranged on the base jaw 8 at the 12 o'clock, 3 o'clock, 6 o'clock and 9 o'clock positions, but they can also be arranged rotated by 45° with respect to the pressing axis X.

[0056] Figure 7 and Figure 8 The third embodiment shown (also only within the scope of the cutting tool 11) involves two cutting attachments 12. Figures 1 to 3 The description of the first embodiment of the invention shown is explained. In contrast, the third embodiment is characterized by two additional centering and holding attachments 30, which are arranged (rotated by 90° with respect to the pressing axis X) between the two cutting attachments 12. Each centering and holding attachment 30 comprises a base structure 31 and a centering and holding structure 32. For the base structure 31, the above-mentioned description of the base structure 13 of the cutting attachment 12 applies accordingly (especially with regard to the installation on the base jaws 8 of a radial press equipped with a cutting tool 11). The corresponding centering and holding structure 32 comprises two workpiece holders 33 in the form of holding claws 34 with recesses 35 (workpiece support surfaces 36) adapted to the geometry of the workpieces W to be cut. The holding claws 34 are axially offset relative to the cutting structures 14 of the two cutting attachments 12, so that the cutting structures 14 are arranged between the holding claws 34. The holding claws 34 are elastically supported on the corresponding base structure 31, so that the workpiece support surfaces 36 of the workpiece holders 33 are reduced in their distance from the corresponding base jaws 8 with respect to the preload. The combination of a guide bolt 37 and a preload spring 38 is used for this purpose. This enables the four workpiece holders 33 to be closed around the workpieces W to be separated at an early stage, ideally at the beginning of the cutting process or shortly thereafter.

[0057] Figures 9 to 11The fourth embodiment shown in FIG. 1 (also only within the scope of the cutting tool 11) involves two cutting attachments 12. Figures 1 to 3 The description of the first embodiment of the present invention shown in FIG. 4 is, in contrast, characterized in that the two mutually corresponding cutting edges 20 do not extend in a straight line, but rather extend in a circular arc segment. They are also limited to a portion of the width of the cutting structure 14, i.e., its central area.

[0058] Fig.12 The fifth embodiment shown in FIG. 1 (also only within the scope of the cutting tool 11) is basically composed of Figures 1 to 3 The description of the first exemplary embodiment of the invention shown in FIG. 1 is explained. In contrast, the fifth exemplary embodiment is characterized in that the two cutting edges 20 correspond to each other only in regions, i.e. in the two outer sections, so that they (ideally) abut against each other linearly when the cutting tool 11 is closed. In the central section, on the other hand, the cutting edges 20 do not correspond to each other, but define a notch 39 (here represented by way of example by a circular outline). It is clear that the geometry of the notch 39 can be adjusted to the geometry of the workpiece W to be separated.

[0059] Unlike the cutting tools according to the five embodiments described above, Fig.13 and Fig.14 The cutting tool is not prepared for separating the workpiece by pinching, but for separating the workpiece by shearing.

[0060] exist Fig.13 In the sixth embodiment of the invention shown in (also only within the scope of the cutting tool), the cutting tool 11 consists of two cutting attachments 12 and four linear guide elements 21. Each of the two cutting attachments 12 itself comprises a base structure 13 and a cutting structure 14 extending therefrom in the direction of the extrusion axis. To avoid repetition, the above description applies without restriction to the corresponding base structure 13 and the four linear guide elements 21. In contrast, the two cutting structures 14 are designed here as shear blocks 40 offset from each other in the direction of the extrusion axis X. Each shear block 40 defines a cutting edge 20 in the form of a shear edge 41. It is designed to be straight in the sixth embodiment.

[0061] In contrast, Fig.14 In the seventh embodiment of the invention shown, the shearing edge 41 (forming the cutting edge 20) of the shearing block 40 is not straight. Rather, it is extended with multiple bends (in the shearing plane perpendicular to the extrusion axis X), and is designed so that the two outer sections 41.1 are located on a straight line orthogonal to the direction of movement B, and the two inner sections 41.2 located therebetween are oriented in a V-shaped manner opposite to each other. The V-shaped arrangement of the inner shearing edge sections 41.2 is accompanied here by a workpiece receiving groove 42 (with a V-shaped cross section) on the surface of the base structure 13 of the relevant shearing block 40 facing the corresponding other cutting attachment 12.

[0062] from Fig.14 It can also be seen that within the scope of the invention, the base structure 13 and the cutting structure 14 can also be two functional areas of a single component, that is, the relevant cutting attachment 12 can be designed in one piece. To avoid misunderstandings, this obviously also applies to the other embodiments of the invention explained above.

Claims

1. A radial press with at least six base jaws (8) arranged uniformly and concentrically around a pressing axis (X), which can be moved radially in the direction of the pressing axis (X) and away from the pressing axis by a drive unit, wherein: The base jaws (8) each have a radially inner support surface (9) and a mechanical retaining device for a pressure jaw that is replaceably mounted thereon. The invention is characterized in that a cutting tool (11) is accommodated in a tool installation space defined outwardly by the base jaws (8), and has the following characteristics: - the cutting tool (11) comprises a plurality of cutting attachments (12) respectively mounted on the base jaws (8); - the cutting attachments (12) each comprise a base structure (13), and at least one of them also comprises a cutting structure (14); - the base structure (13) has a support surface (15) which bears against the bearing surface (9) of the corresponding base jaw (8) and at least one snap-in element which cooperates with the mechanical retaining device of the corresponding base jaw (8); At least one cutting structure (14) protrudes from the corresponding base structure (13) in the direction of the extrusion axis (X) and has a cutting edge (20) facing away from the supporting surface (15) of the corresponding base structure (13).

2. The radial press according to claim 1, characterized in that The cutting attachment (12) facing the extrusion axis (X) and opposite the cutting edge (20) of the cutting structure (14) of the other cutting attachment (12) has a mating retaining structure with a workpiece support surface.

3. The radial press according to claim 1, characterized in that At least two cutting attachments (12) have cutting structures (14) whose cutting edges (20) act in a cutting manner on each other.

4. The radial press according to claim 3, characterized in that The cutting edges (20) are arranged offset parallel to one another in a direction transverse to the direction of movement (B) of the cutting attachments (12) relative to one another for a shearing action on a workpiece (W).

5. The radial press according to claim 3, characterized in that The cutting structure (14) has mutually corresponding cutting edges (20) which are opposite to each other in the relative movement direction (B) of the cutting attachment (12).

6. The radial press according to any one of claims 1 to 5, characterized in that It comprises two cutting attachments (12) which are arranged on mutually opposite base jaws (8) and are preferably arranged vertically one above the other.

7. The radial press according to claim 6, characterized in that The radial press is designed as a yoke press with a lower yoke (2) and an upper yoke (3), wherein the distance between the yokes (2; 3) can be varied by a drive unit.

8. The radial press according to any one of claims 3 to 7, characterized in that Each second base jaw (8) is equipped with a cutting attachment (12).

9. The radial press according to any one of claims 1 to 8, characterized in that The bearing surface (9) of the base jaw (8) and the support surface (15) of the base structure (13) of the cutting attachment (12) are cylindrically curved correspondingly to one another.

10. The radial press according to any one of claims 1 to 9, characterized in that The base structure (13) of the cutting attachment (12) protrudes beyond the corresponding base jaw (8) in the circumferential direction.

11. The radial press according to any one of claims 1 to 10, characterized in that At least one cutting edge (20) is oriented transversely to the extrusion axis (X).

12. The radial press according to any one of claims 1 to 10, characterized in that At least one cutting edge (20) is oriented obliquely or parallel to the extrusion axis (X).

13. The radial press according to any one of claims 1 to 9, characterized in that At least one cutting structure (14) is mounted on a corresponding base structure (13) in such a way that the orientation of its cutting edge can be adjusted.

14. The radial press according to any one of claims 1 to 13, characterized in that The cutting tool (11) comprises two cutting appendages (12) diametrically opposite one another and two wall elements (24) extending substantially parallel to the extrusion axis (X) and laterally delimiting an intermediate space between two base structures (13) when the cutting tool (11) is closed.

15. The radial press according to any one of claims 1 to 14, characterized in that The cutting tool (11) has a linear guide element (21) which can guide two diametrically opposed base structures (13) relative to one another by a relative movement (B) perpendicular to the extrusion axis (X).

16. The radial press according to any one of claims 1 to 15, characterized in that The cutting tool (11) has at least one workpiece receptacle (26) which is arranged in the region of an end face (15) of a base structure (13).

17. The radial press according to claim 16, characterized in that The workpiece receiving portion (26) is replaceably mounted on a corresponding base structure (13).

18. A radial press according to claim 16 or 17, characterized in that The workpiece receptacle (26) is designed as a spindle.

19. A radial press according to claim 16 or 17, characterized in that The workpiece receptacle (26) is designed as a plate (28) having a recess (27).

20. The radial press according to any one of claims 1 to 19, characterized in that A centering and / or holding attachment (30) is mounted on at least two further base jaws (8) and has a workpiece holder (33) which is axially offset relative to at least one cutting edge (20) of a cutting tool (11).

21. The radial press according to claim 20, characterized in that The centering and / or holding attachment (30) is designed to be telescopic, so that the workpiece support surface (36) of the workpiece holder (33) can reduce its distance from the corresponding base jaw (8) relative to the preload force.

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