EP0546287A1 - Quick-clamping tool for hot forging presses - Google Patents

Abstract

The invention relates to a quick-clamping tool (2) for hot forging presses, in which - in contrast to the prior art - the upper part (15) of the basic holder and the lower part (16) of the basic holder are tightened from the inside outwards. This gives more space for the accommodation of tools. In addition, this gives a very compact construction which can be protected in an optimum manner against dirt. The quick-clamping tool (2) according to the invention allows considerably reduced set-up times compared to the prior art. It can be changed by means of a fork-lift truck, an elevating truck, a changing truck (52) or by means of lifting gear without needing to be raised by way of centring shoulders or the like.

Description

The invention relates to a quick-action clamping tool for hot forging presses, with two opposing cassettes, which enclose a die installation space between them, a base holder part fastened to the machine tappet or the like being arranged on the upper side of the upper cassette, while one on the machine body is arranged on the underside of the lower cassette attached to a machine table or the like fastened base holder lower part, with clamping elements 18 to 25; 62 for releasably attaching the base holder upper part and the base holder lower part 15 or 16 to the associated cassette 3 or 4.

Quick clamping tools for hot forging presses of the required type belong to the state of the art. In the constructions belonging to the state of the art, both the upper holder part and the lower holder part with the respective cassette are clamped from the outside inwards by wedges which are constantly loaded in the clamping direction. This limits the joint installation space, so that there is correspondingly little space available for the tools.

Finally, the prior art design requires centering bars, by means of which the tool, which in some cases can weigh several tons, must be lifted by means of a forklift or the like when changing tools. This results in long set-up times.

In addition, the parts of the quick-action clamping tool are unhindered from contamination by scale, dust or the like, so that a corresponding cleaning must first be carried out when changing the tool, which further extends the set-up times.

DD-PS 241 027 discloses a quick-action clamping system for tool holder plates on rolling slides in cross-rolling machines by means of T-shaped clamping elements which can be relaxed by spring-loaded pressure pistons from the first pressure cylinders arranged in the rolling slides and are mounted in T-shaped grooves on the back of the tool holder plates. wherein the grooves are arranged in several rows, and that the first pressure cylinders are connected via a pressure line to a second pressure cylinder arranged laterally on the roller carriage, the spring-loaded pressure piston of which is in operative connection in tool holder plates with a spring-loaded pressure piston of a third pressure cylinder attached to the machine stand.

From DD-PS 241 026 a further quick clamping system for tool holder plates on rolling slides of cross-rolling machines by means of spring-loaded, pressure-releasable T-shaped clamping elements is known, the T-shaped grooves being mounted on the back of the tool holder plates in such a way that the grooves are arranged in several rows , where two step-shaped relaxation elements are mounted on or in the roller slides along or across the rolling direction and the relaxation elements are in operative connection with the working cylinders attached to the machine stand outside the roller slide area when changing the tool holder plate, and in that the relaxation elements are in active connection with the tensioning elements.

The invention has for its object to improve a quick-action clamping tool of the type in question in such a way that the installation space for tools is significantly increased and that considerably shorter set-up times are possible.

The object is achieved by the features set out in claim 1.

Because the quick-action clamping tool according to the invention is clamped from the inside to the outside, there is more space inside for the installation of tools in the die installation space.

Another advantage is that the two cassettes with the basic holder upper part and the lower holder part can be arranged very compactly, that is to say in a space-saving manner. This opens up the possibility of optimally protecting the space between the upper part of the basic holder and the cassette assigned to it on the one hand and between the lower part of the basic holder and the cassette located below on the other hand against dirt. The set-up times can be reduced, for example, to a third to a fifth of the previous set-up times for comparable quick-action clamping tools. Since the entire table or ram surface can be covered by the cassettes according to the invention, an optimal arrangement and adaptability of the guides to the respective requirements is possible.

The embodiment according to claim 2 is particularly compact, since the basic holder upper part and the basic holder lower part are each arranged between the U-shaped legs of the associated cassette.

In the embodiment according to claim 3, the quick-action clamping tool can be easily placed or pushed onto the relevant roller conveyors in the machine by a forklift, a crane or a lifting truck. This enables a quick change. This was not the case with previous designs because the quick-action clamping tool had to be lifted above rails and clamping bars and precisely placed. This also results in a more stable guidance of the cassettes and thus lower die costs. A die guide can be dispensed with.

It is also possible to lift the entire quick-action clamping tool hydraulically or mechanically using tools. With optimal design of the conditions - with a change carriage - it is possible to convert even quick-release tools weighing several tons in just a few minutes. With a forklift, for example, a quick-action clamping tool according to the invention can be converted in less than five minutes.

Claim 4 describes a further advantageous embodiment of the invention. In this, the tool, which is itself provided with roller conveyors, is pushed against the machine. The roller conveyors of the change carriage, intended as an assembly aid, are provided on the same level and, after lifting the roller tracks (hydraulically), are aligned with the roller tracks arranged on the base holder base, so that the quick-action clamping tool can be pushed off the change carriage onto the machine and brought into the clamping position. If such a quick-action clamping tool is to be changed, it can either be pulled out on the same side of the machine onto a trolley, or the tool can be pushed or pulled out further through the machine, so that a new one alternates from the other side Quick clamping tool can be pushed onto the roller tracks of the base holder base. If necessary, a pivotable stop can be provided on the opposite side in order to prevent the respective quick-action clamping tool from being pushed too far. This stop can also serve as a centering aid.

In the embodiment according to claim 6, the relevant U-leg of the cassette is designed as an exchangeable strip part. This makes it possible to unscrew these strips in the event of a fault.

According to claim 7, the basic holder lower part is encapsulated by an apron attached to the back and front of the cassette against contamination.

According to claim 8, the roller conveyors in the base holder part are hydraulically adjustable in height and can also be locked at the desired height. As a result, the roller conveyors can be set to the desired level, for example to the level of roller conveyors of an interchangeable vehicle, on which the quick-action clamping tool to be changed can be removed or another quick-action clamping tool can also be brought in.

In claim 9, an alternative installation of the clamping elements in the basic holder is described. Vertical access means that these clamping elements, i.e. clamping wedges such as cylinders and springs, can also be accommodated in the press table. For this purpose, the receptacles for the clamping wedges, ie cylinders and their guides, are fastened in corresponding receptacles by means of clamping screws arranged vertically with their longitudinal axes.

Claim 10 describes a further advantageous embodiment, in which the receptacles for the clamping elements are arranged in corresponding exceptions of the press table and are detachably fastened by screws to be arranged vertically.

According to claim 11, also within the scope of the inventive concept, embodiments in which the base holder lower part and upper part are cast on or otherwise arranged in one piece on the press table and press stand so as to avoid mechanical fastening of the basic holder.

Further advantageous embodiments are described in claims 12 to 14.

• Fig. 1 eine perspektivische Darstellung einer abgebrochen veranschaulichten Warmschmiedepresse mit einem als Montagehilfe für ein nicht dargestelltes Schnellspannwerkzeug ausgebildeten Wechselwagen in Montagestellung vor der Warmschmiedepresse angeordnet;
• Fig. 2 eine perspektivische Darstellung einer abgebrochen veranschaulichten Warmschmiedepresse mit einem in derselben angeordnetem Schnellspannwerkzeug (ohne Werkzeuge dargestellt), wobei das Grundhalteroberteil nicht veranschaulicht ist;
• Fig. 3 eine Stirnansicht in Richtung des Pfeiles A der Fig. 2, allerdings mit Grundhalteroberteil;
• Fig. 4 eine Einzelheit aus Fig. 3, in größerem Maßstab, im Längsschnitt;
• Fig. 5 eine weitere Ausführungsform der Erfindung in perspektivischer Darstellung entsprechend Fig. 1 ;
• Fig. 6 eine Stirnansicht in Richtung des Pfeiles B der Fig. 8;
• Fig. 7 eine Draufsicht zu Fig. 6;
• Fig. 8 eine Einzelheit aus Fig. 5, in größerem Maßstab, im Längsschnitt, und
• Fig. 9 abermals eine weitere Ausführungsform der Erfindung, teils im Schnitt, abgebrochen dargestellt.

In the drawing, the invention is illustrated - partly schematically - using several exemplary embodiments. Show it:

• Figure 1 is a perspective view of a broken-off hot forging press with an interchangeable carriage designed as an assembly aid for a quick release tool, not shown, arranged in the assembly position in front of the hot forging press.
• 2 shows a perspective illustration of a broken-off hot forging press with a quick-action clamping tool (shown without tools) arranged therein, the basic holder upper part not being illustrated;
• 3 shows an end view in the direction of arrow A in FIG. 2, but with the upper part of the basic holder;
• FIG. 4 shows a detail from FIG. 3, on a larger scale, in longitudinal section;
• 5 shows a further embodiment of the invention in a perspective view corresponding to FIG. 1;
• Fig. 6 is an end view in the direction of arrow B of Fig. 8;
• FIG. 7 is a top view of FIG. 6;
• Fig. 8 shows a detail of Fig. 5, on a larger scale, in longitudinal section, and
• Fig. 9 again shows another embodiment of the invention, partly in section, broken off.

Reference numeral 1 denotes the stand of a hot forging press, not shown in detail, which has a space for the arrangement of a quick-action clamping tool 2, which in the Drawing is illustrated without tools for ease of illustration.

The quick-action clamping tool 2 essentially has two cassettes 3 and 4 which are U-shaped in the end view and which are of the same size and design in the illustrated embodiments.

The cassettes 3 and 4 each have a web-shaped part 5 and 6, with which clamping strips 7, 8 and 9, 10 designed in the manner of U-legs are integrally connected in terms of material.

The cassettes 3 and 4 are made of steel.

From FIGS. 2 and 3 it can be seen that the U-legs 7, 8 on the one hand and the U-legs 9, 10 on the other hand are offset from one another by 180 degrees, that is to say are directed away from one another. The U-legs 7 and 8 point upwards, while the U-legs 9 and 10 point downwards to a support table 11 of the stand 1.

The reference numeral 60 denotes three transport supports and 61 a transport bracket. As can be seen from FIG. 2, one of these transport supports 60 is arranged on one end face as a mirror image of the longitudinal axis of the quick-action clamping tool 2, while only one such transport support is located on the opposite side of the quick-action clamping tool. This results in a safe three-point suspension and support. In this way, the quick-action clamping tool 2 can be lifted and transported, for example with the forklift in the transport bracket 61 between the surfaces of the cassette 4 and the web-shaped part 5 next to the transport supports 60. The lower part is also lifted and transported by the upper part. It would also be possible to accomplish the transport with cylindrical bores in the end face of the lower cassette 4 and bolts in the plate of the forklift, not shown. Then no transport tabs 61 would be required. Of course, the transport of the clamping tool is not limited to the manner just described. Other modes of transport are also possible.

From Fig. 3 it can also be seen that the cassettes 3 and 4 each have a die installation space 12 or 13 of the same size in the embodiment shown, in which the tools (not shown) are arranged in each case. The die installation spaces 12 and 13 are arranged coaxially to one another.

The center line of the quick-action clamping tool is identified by reference numeral 14.

A basic holder upper part 15 is arranged between the strip-shaped U-legs 7 and 8 and a basic holder lower part 16 is arranged between the strip-shaped U-legs 9 and 10. Basic holder upper part 15 and basic holder lower part 16 are also of the same size in the illustrated embodiments, but can also be dimensioned differently.

A transverse axis running orthogonal to the center line 14 is designated by the reference symbol 17.

Both the base holder upper part 15 and the base holder lower part 16 are in their end regions, as a rule, by two pairs or also a plurality of clamping wedges 18, 19 or 20, 21 and 22, 23 or 24, 25 with the clamping strips 7, 8 or 9 , 10 releasably lock. The clamping wedges, each of which cannot be seen from the drawing, are designed and arranged, for example, like the clamping wedges 18, 19.

Each of the tensioning wedges 18 to 25 is under the tensioning force of a spring element designed as a plate spring in the illustrated embodiments, of which only the spring elements 26 and 27 can be seen from FIGS. 4 and 5. 4 shows a clamping wedge for the base holder lower part 16, specifically the right front clamping wedge shown in FIG. 3. In Fig. 4, reference numeral 25 of the wedge behind it has been added. The opposite clamping wedges 22 and 24 are designed accordingly.

In the embodiments shown in the drawing, the plate springs 26, 27 are of the same size and dimension for all clamping wedges 18 to 25. The plate springs 26, 27 are thus supported on all clamping wedges 18 to 25 each against an inner, in the axial direction of the plate springs 26, 27 against an adjustable abutment stopper, only the abutment stopper 28 for the sake of simplicity in FIGS. 4 and 5 have been provided with reference numerals. The abutment plugs 28 each have a pin projecting in the direction of the associated clamping wedges 18 to 25, again only the pins 29 and 30 being provided with reference numerals in the drawing. The pins 29 and 30 and all other pins are integrally formed with the respective associated abutment plug and, like the clamping wedges 18 to 25, are preferably made of steel. The abutment plug 28 has a plate-shaped part, which is provided on its outer circumference with threads 31 and 32, with which the abutment plug 28 is in each case removably screwed into a corresponding internal thread of a bore 33 or 34. The pins 29 and 30 guide the associated plate spring 26 and 27 over part of their axial length and center them with respect to the bore 33 and 34, respectively. In addition, the plate springs 26 and 27 and, of course, with all the other clamping wedges not particularly marked in the drawing from the associated wedge, for example from the Clamping wedge 23 (FIGS. 5 and 4) encompassed in a sleeve-like manner with a length section 35 and 36, which is integrally connected in material terms to the associated clamping wedge, for example 18, 20 or 23, 25.

The displacement of the clamping wedge 18 to 25 is limited in the illustrated embodiments by the associated abutment plug, for example 28 by a stop.

In addition, it can be seen from the drawing that the length section 35 or 36 is provided with a piston-shaped thickening 37 or 38, each having an annular groove 39 or 40 for a sealing element 41 or 42.

Reference numerals 43 and 44 denote a connection bore in a cylinder 62 through which a suitable pressure medium, for example hydraulic fluid, can be supplied to a space 45 under pressure medium pressure. This space 45 is sealed on the one hand by the sealing element 41, 42 and on the opposite side by a further sealing element 46 or 47 in a pressure-tight manner. In this way, by supplying pressure medium to the space 45, it is possible to move all clamping wedges 18 to 25 simultaneously and synchronously against the restoring force of the associated spring elements 26, 27 in the direction of the abutment plug 28 and thereby the basic holder upper part 15 on the one hand and the basic holder lower part 16 on the other hand to unlock the associated cassette 3 or 4. Due to manufacturing tolerances in the clamping wedges and clamping pockets, the clamping wedges penetrate into the clamping pockets at different depths. Because the spring force is progressive, different spring pressures are created. The clamping wedge with the lowest spring force and friction is moved first. At the beginning of the wedge movement, the static friction must first be overcome. As a rule, the clamping wedges do not move completely evenly, but this has no influence on the function of the clamping tool. An absolutely even synchronous movement could only be achieved with a flow divider on the hydraulic unit. It would also be possible to take separate partial delivery flows directly at the control mirror or head tube, which have the same basic properties (delivery pressure, delivery speed and delivery quantity) and would thus enable synchronous movement of the clamping wedges. It is also possible to loosen and lower only the lower tool, for example to rework the engraving of the dies. After the pressure medium pressure has been eliminated, the clamping wedges 18 to 25 simultaneously arrive in the installed position and synchronously in their locking position shown in the drawing.

It can clearly be seen that the upper part 15 of the basic holder and the lower part 16 of the basic holder are arranged in their installed position for the most part between the clamping bars 7 and 8 or 9, 10 of the cassettes 3 and 4.

The basic holder lower part 16 is provided with two roller conveyors 48, 49 arranged symmetrically to the center line 14, which can be aligned with the same roller conveyors 50 and 51 of an interchangeable carriage 52 when an interchangeable carriage 52 is pushed against the roller conveyor 48 and 49 from an end face of the hot forging press . For this purpose, the change carriage 52 is arranged to be movable on the floor by means of a frame 53 and rollers 54.

At 55, a stop is arranged on the base holder lower part 16 or on the hot forging press. The stop 55 can be designed to be folded away. Otherwise, the stop 55 protrudes orthogonally to the surface 56 of the base holder part 16, so that a quick-action clamping tool 2 brought on the change carriage 52 is pushed onto the roller conveyors 48 and 49 of the base holder part 16 from the roller conveyors 50, 51 of the change carrier 52 and up to the counterpart Stop 55 can be inserted into the hot forging press. The stop 55 thus simultaneously represents a securing and centering means. In the stop position, the clamping wedges 18 to 25 can be brought into the locking position shown in FIG. 3 by removing the pressure medium pressure and by simultaneously releasing the associated spring elements 26 and 27.

If a tool change is to take place, this can be done, for example, in the following way:

A new quick-action clamping tool 2, consisting of the two cassettes and the basic holder upper part and the tools, is moved up on the change carriage 52. The quick-action clamping tool 2 located in the hot forging press is released by appropriate pressurization of the clamping wedges 18 to 25, whereupon the quick-action clamping tool 2, which is no longer required, is pushed by folding away the stop 55 on the opposite side to the approached new quick-action clamping tool 2 on an interchangeable carriage (not shown) arranged there , whereupon from the other side the new quick-action clamping tool 2 resting on the change carriage 52 is pushed onto the roller conveyors 48, 49 and then locked in the manner described. This can be done in a few minutes, for example in less than 5 minutes.

Another possibility of changing the tool is that first an empty change carriage 52 is brought into alignment with the roller conveyors 48, 49, whereupon after releasing the clamping wedges 18 to 25, the quick-action clamping tool 2 is pulled out of the hot forging press onto the roller conveyor 50, 51 and then transported away , whereupon a new quick-action clamping tool 2 via a change carriage 52 moved up to the hot forging press and is then pushed onto the roller conveyors 48, 49.

Of course, the quick-change tools can also be changed by means of a forklift, a hoist or the like. In no case, however, is it necessary to lift the quick-action clamping tools 2 over centering strips or the like.

As can be seen from FIG. 2, a sealing apron 57 or 58 is connected to the lower cassette 3, namely on each end face, as a result of which incidence of dust, scale and the like between the cassette 4 and the base holder part 16 is excluded. As a result, cleaning is no longer required when changing the quick-action clamping tools 2, or the effort for cleaning is considerably reduced compared to conventional tools.

Since in the invention the clamping takes place from the inside to the outside via the clamping wedges 18 to 25, there is a larger die installation space 12, 13. In addition, the cassettes 3, 4 are stably guided, which is associated with lower die costs.

Due to the omission of the adjustment work, four lifting cylinders can be dispensed with compared to conventional designs.

In the embodiments shown in FIGS. 5 to 8, the clamping wedges 18 to 25 are each arranged in a detachable receptacle 63, each of which is arranged flush with the side surfaces of the base holder lower part 16 (FIG. 5) in a lateral recess, for example a cutout . The receptacles 63 are each releasably connected to the base holder lower part 16 by screws running vertically with their axes. For reasons of simplification, three screws 64 and 65, respectively, arranged one behind the other, have been shown on both sides of the longitudinal center axis of the clamping wedges 23 and 25 in question (FIG. 7). The number of screws 64 and 65 can be larger or smaller than shown. The screws 64 and 65 are designed as countersunk screws, for example hexagon socket screws with a countersunk head.

It is also possible to cast the base holder lower part 16 and upper part 15 onto the press table and press stand (not shown) in order to avoid mechanical fastening of the basic holder. The cylinder could be mounted horizontally in the ram, but only in the press table as shown in FIGS. 5 to 6, since it is not possible to make a lateral bore because of the press stands.

In the embodiment according to FIG. 9, the same reference numerals have been used for parts with the same function. This embodiment differs from the prescribed one in that the clamping bars 7 to 10 are connected by screws to the relevant cassette 3 or 4. For reasons of simplification, this has only been illustrated in more detail using the cassette 4. The reference numerals in parentheses are intended to indicate that the cassette 3 is also designed accordingly.

The clamping strip in question, for example 9, is detachably coupled to the cassette 4 by a plurality of screws 59 arranged in parallel and at a distance from one another in the longitudinal direction of the associated cassette, for example 4. These U-legs 7, 8 and 9, 10, which are designed as tensioning strips, can also be unscrewed in the event of a malfunction, so that there is easy lateral access.

The features described in the abstract, in the patent claims and in the description and apparent from the drawing can be essential for realizing the invention both individually and in any combination.

bibliography

• DE-PS 25 44 711
• DE-PS 27 16 023
• DD-PS 241 026
• DD-PS 241 027

Reference symbol list

• 1 stand
• 2 quick release tool
• 3 cassette
• 4th
• 5 part, web-shaped
• 6 ""
• 7 U-legs, tension bar
• 8th "
• 9 ""
• 10 "
• 11 support table
• 12 die installation space
• 13 "
• 14 center line
• 15 basic holder upper part
• 16 basic holder base
• 17 transverse axis
• 18 wedge
• 19 "
• 20 "
• 21 "
• 22 "
• 23
• 24 "
• 25 "
• 26 spring element, disc springs
• 27 ""
• 28 abutment plugs
• 29 cones
• 30 "
• 31 threads
• 32 "
• 33 hole
• 34 "
• 35 length section
• 36 "
• 37 thickening, piston-shaped
• 38 ""
• 39 ring groove
• 40 "
• 41 sealing element
• 42 "
• 43 connection hole
• 44 "
• 45 room
• 46 sealing element
• 47 "
• 48 roller conveyor
• 49 "
• 50 "
• 51 "
• 52 change cars
• 53 frame
• 54 roll
• 55 stop
• 56 area
• 57 sealing apron
• 58 "
• 59 screw
• 60 transport bolts, only required for installation with forklift
• 61 Transport strap, only required for installation with forklift
• 62 cylinders
• 63 holder, detachable
• 64 countersunk screw
• A viewing direction
• B

Claims (14)

1.Quick clamping tool (2) for hot forging presses, with two opposing cassettes (3, 4) enclosing a die installation space (12, 13) between them, with an upper part (15) attached to the machine tappet or the like attached to the upper side of the cassette (3) ) is arranged, while on the underside of the underlying cassette (4) a base holder lower part (16) attached to the machine body, on a machine table or the like is releasably assigned, with clamping elements (18 to 25; 62) for releasably fastening the top holder and the Basic holder lower part (15 or 16) on the associated cassette (3 or 4), characterized in that both the basic holder upper part (15) and the basic holder lower part (16) on the respectively assigned cassette (3 or 4) from the inside of the quick-action clamping tool (2) is releasably attached to the outside in such a way that both the basic holder upper part (15) and the basic holder lower part each between U-legs (7, 8 or 9, 10) of the U-shaped cassettes (3 or 4) is arranged and the clamping elements (18 to 25; 62) releasably engage in the U-legs (7, 8 or 9, 10). 2. Quick-action clamping tool according to claim 1, characterized in that the two cassettes (3 and 4) are each U-shaped in a cross section guided orthogonally to their longitudinal axis and that between the U-shaped legs (7, 8 and 9, 10) and on the web (5, 6) connecting these U-shaped legs (7, 8 or 9, 10), the base holder upper part (15) or the base holder lower part (16) is arranged in each case. 3. Quick clamping tool according to claim 1 or 2, characterized in that the base holder lower part (16) with two spaced and parallel roller tracks (48, 49) is provided, on which the lower cassette (4) with its web (6) resting and thereupon the upper cassette (3), for example, can be arranged so that it can be transported indirectly, if necessary with the built-in tools, the upper (3) and the lower cassette (4) being provided on each side with a plurality of recesses or openings arranged at a distance from one another, into the respective clamping wedges (18, 19, 20, 21, 22, 23, 24, 25), which are loaded, for example, by spring elements (26, 27) and can be moved into the unlocking position by pressure medium, in particular by hydraulic pressure, the clamping wedges ( 18 to 25) on their U-legs (7 to 10) facing away from each other longitudinal sections (35) are tubular, and that in these tubular longitudinal sections (35) the resp GE spring element (26, 27) is mounted, the spring element (26, 27) being supported with its other end against an abutment plug (28) which, with an integrally formed pin (29 or 30), the relevant spring element (26 or 27) centered, the clamping wedges (18 to 25) with their tubular longitudinal section (35) each being longitudinally displaceable and sealingly guided in a bore (33 or 34), pressure medium, in particular hydraulic oil, being insertable in a sealed space (45) , by means of which the clamping wedges (18 to 25) can be moved in the unlocking position against the restoring force of the spring element (26 or 27) in question. 4. Quick clamping tool according to claim 1 or one of the following, characterized in that the quick clamping tool (2) by means of an interchangeable carriage (52) can be transported to the hot forging press and can also be transported away therefrom, the interchangeable carriage (52) likewise roller conveyors (50, 51) at the same distance as the roller tracks (48, 49) on the base holder lower part (16) The roller conveyors (50, 51) of the change carriage (52) are to be arranged in the same height range as the roller conveyors (48, 49) on the base holder lower part (16) or are adjustable and lockable at this level. 5. Quick clamping tool according to claim 1 or one of the following, characterized in that an optionally pivotable stop (55) is arranged on the base holder lower part (16) or on the machine table or on the stand, against which the quick clamping tool (2) abuts in the installed position and that to change the quick-action clamping tool (2), this can either be transported away on the same side of the machine onto a carriage (52) on which the new quick-action clamping tool (2) can also be moved, or the quick-action clamping tool (2) is swung away after the stop (55 ) moved by the machine so that a new quick-action clamping tool (2) can be inserted alternately from the other side onto the roller conveyors (48, 49) of the base holder lower part (16). 6. Quick clamping tool according to claim 1 or one of the following, characterized in that the U-legs designed as clamping strips (7 to 10) on the cassettes (3 and 4) are arranged as exchangeable strips (9) and by screws (59) or the like are detachably coupled to the associated cassette (3 and 4). 7. Quick clamping tool according to claim 1 or one of the following, characterized in that on the front and rear of the underlying cassette (4) and / or on the front and back of the base holder lower part (16) a sealing apron (57 or 58) is arranged, which covers the space between the lower cassette (4) and the base holder lower part (16) against dirt. 8. Quick clamping tool according to claim 4 or one of the following, characterized in that the roller tracks (48, 49) in the base holder lower part (16) are hydraulically adjustable in height. 9. Quick clamping tool according to claim 1 or one of the following, characterized in that the clamping elements (18 to 25; 62) are each arranged in a receptacle (63) in a lateral recess of the base holder lower part (16) and the base holder upper part (15) and in that the receptacle (63) for each clamping wedge (18 to 25) is fastened by a plurality of screws (64), the longitudinal axes of which run parallel and orthogonal to the surface (56) having the roller tracks (48, 49). 10. Quick clamping tool according to claim 1 or one of claims 2 to 8, characterized in that the clamping elements (18 to 25; 62) are each arranged in a lateral recess of the press table in a receptacle (63) and that the receptacle (63) for each clamping wedge (18 to 25) is fastened by a plurality of screws (64), the longitudinal axes of which run parallel and orthogonal to the surface (56) having the roller tracks (48, 49). 11. Quick clamping tool according to claim 1 or one of the following, characterized in that the base holder upper part (15) or the base holder lower part (16) are attached in one piece in terms of material, for example cast on, on the press table and on the press stand. 12. Quick clamping tool according to claim 1 or one of the following, characterized in that the clamping elements are each formed as one-piece clamping bars which engage in corresponding recesses in the associated cassette (3 or 4). 13. Quick clamping tool according to claim 12, characterized in that each clamping bar is loaded by a spring element (26) or several spring element packages in the locking position and that each clamping bar is assigned at least one piston-cylinder unit to be acted upon by pressure medium, by means of which the clamping bar is located Overcoming the spring force in the unlocked position. 14. Quick clamping tool according to claim 12 or 13, characterized in that each clamping bar extends over almost the entire axial length of a cassette (3 or 4).

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