EP0164490A2 - Punch press with a tool magazine - Google Patents

Abstract

In a cutting press for working plate-shaped workpieces the workpiece is held motor movable normal this direction, the tool is arranged in a lying position in a U-shaped tool receptacle which is movable, and a stationarily arranged drive system is in operative connection with the tool receptacle via a coupling device.

Description

The invention relates to a cutting press according to the preamble of claim 1.

Such cutting presses are known to exist in a variety of forms, usually the workpiece, namely the sheet to be machined, is guided in a motor table relative to the tool in two mutually perpendicular directions. Depending on the complexity of the shapes to be machined, the cutting press must be equipped with appropriate tool magazines. Both turret cutting presses, in which the tool magazine has the shape of a turret plate that can be rotated about a vertical axis, in the peripheral region of which the tool is held, as well as cutting presses with single-head stations, in which the tools are either inserted manually or automatically from an assigned tool magazine, or are known be replaced. As the size of the workpieces increases the difficulty, however, in order to achieve a precise machining, to guide them accordingly on the coordinate table, so that one has started to shift one of the two movements of the workpiece mentioned at right angles to one another into the tool. Here too, however, there arises the difficulty of maintaining a desired accuracy of machining when guiding very heavy tools, since considerable masses have to be guided very precisely. The latter either require very strong drive systems, which have a corresponding construction volume and a corresponding weight, or relatively low travel speeds and an associated low throughput of the cutting press have to be accepted. In this context, it is known to arrange the eccentric shaft used to actuate the punching tool and associated parts of the drive system together with the tool so that they can be moved by a motor. (DE-AS 23 34 438) A cutting press is also required to have the largest possible tool reservoir in order to be able to machine even complex sheet shapes.

It is the object of the invention to improve a cutting press of the type mentioned, avoiding the disadvantages inherent in the prior art, in such a way that, with a large tool reservoir, the tool guide is easily subject to rapid travel, so that correspondingly high throughput rates of the cutting press can be achieved. This object is achieved by the features of the characterizing part of claim 1. It is therefore essential that when the tool is moved, which in a cutting press usually consists of the punch, the scraper and the die, only the tool holder is displaceably mounted in one direction, while the drive assigned to this is arranged stationary.

The connection between the tool holder and its drive takes place via a coupling device which is designed in such a way that it enables an intervention, starting from the stationary drive, on the moving tool holder over the length of the movability. It is achieved in this way that the masses to be moved during the movement of the tool are kept very small, so that rapid movement of the tool can be achieved even with a small power drive. The workpiece to be machined is mounted in a direction perpendicular to the travel of the tool in a defined manner, so that in connection with the also movable tool magazine, which is specially designed for transferring tool holders into the work station or for removing tool holders from the work station , a very powerful cutting press is available.

The features of claims 2 and 3 have the advantage that the tool holder is geometrically relatively simple and clear, so that handling devices for moving the tool holder between the work station and the tool magazine can therefore also be designed relatively simple.

Characterized in that both the upper and the lower arm of the tool holder are equipped with special guide devices which are guided on the machine frame, a particularly stable and precise guidance of the tool is guaranteed, which is subject to reliable guidance even with high mechanical loads .

The two-part design of the tool holder according to claim 5, on the other hand, has the advantage that it can be built even more space-saving. In this case, the individual parts of the tool holder are also equipped with special guide devices to ensure precise guidance during mechanical processing.

According to claims 6 to 8, the coupling device consists essentially of a pressure plate guided vertically with a defined stroke relative to the machine frame, the connection between the tool and this pressure plate being effected by a longitudinal groove worked into the latter. The coupling pin formed on the tool, namely the punch, slides in this longitudinal groove, the longitudinal extent of which essentially corresponds to the movability of the tool in this direction. In this way, a functionally easily manageable and very reliable coupling between the tool and the drive system is provided. It is essential that the pressure plate is subject to a very precise vertical guidance and in particular cannot tilt under the forces resulting from the mechanical processing process.

According to claims 9 and 10, the pressure plate is driven by two spaced-apart pairs of toggle levers which are pivotally supported on the one hand on the pressure plate and on the other hand on a toggle lever bearing housing. The oscillating drive of this system of toggle levers can take place, for example, via a stationary eccentric shaft which is driven by a conventional electric motor. In this way, the pressure plate is subject to very robust vertical guidance. The fact that the toggle lever bearing housing at the same time a guide function for the

Pressure plate comes, there is a very clear arrangement.

The actuating rails according to claims 11 and 12 form the part of the coupling device according to the invention which interacts with the scraper pin. According to the invention, these actuating rails are preferably guided on the toggle lever bearing housing, so that the coupling device according to the invention can overall be accommodated in one functional element, namely the toggle lever bearing housing. The actuating rails extend parallel to the longitudinal groove of the pressure plate and also have approximately the same length, which corresponds to the movability of the tool in this direction. A vertical movement of the scraper pin thus comes about because the actuating rails, whose lower, horizontally running longitudinal surface is in sliding contact with the scraper pin, by horizontal displacement due to their inclined sliding surface, which cooperates with a correspondingly inclined guide surface on the machine frame, vertically shift the scraper pin.

According to claims 13 to 15, the tool holders are provided with coupling pieces which can be connected to motor-controlled coupling parts of a drive system. All that is required for a one-piece tool holder is a coupling piece.

The coupling of the ball screw according to claim 16 with a push rod via a connecting block has the consequence that with two-part tool holders whose two parts can only be moved together. In this case, the connection block is mounted so that it can move relative to the machine frame.

The magazine station according to claim 19 can have a capacity be very large, so that a correspondingly large tool reservoir is available for mechanical processing. All that is essential is that the tool magazines located in the magazine station can be moved by a motor in the direction of the work station, so that the individual tool holders are available in the work station. By arranging a corresponding location coding of the individual tool holders in the tool magazines, automatic computer-controlled production of even complex sheet metal structures is possible.

All guide devices of the cutting press according to the invention can be coated with a special lubricant made of plastic, which has a low coefficient of friction, or can also be provided with rollers, which likewise reduce the frictional forces.

• Fig. 1 eine Draufsicht auf eine erfindungsgemäße Schneidpresse in teilweise geschnittener Darstellung;
• Fig. 2 einen Schnitt gemäß der Linie II-II der Fig. 1;
• Fig. 3 einen Schnitt gemäß der Linie III-III der Fig. 2;
• Fig. 4 eben vergrößerten Schnitt entlang der Linie IV-IV der Fig. 1;
• Fig. 5 eine vergrößerte Darstellung der Einzelheit 59 in Fig. 2;
• Fig. 5a eine Ansicht gemäß Pfeil Va der Fig. 5;
• Fig. 6 einen Schnitt gemäß der Linie VI-VI der Fig. 1;
• Fig. 7 einen Schnitt entlang der Linie VII-VII der Fig. 1;
• Fig. 8 eine Schneidpresse entsprechend einem Schnitt gemäß I-I der Fig. 1 jedoch mit einer anderen Werkzeugaufnahme;
• Fig. 9 eine vergrößerte Darstellung der Werkzeugaufnahme gemäß Fig. 8;
• Fig. 10 eine Ansicht gemäß Pfeil X der Fig. 9 in teilweise geschnittener Darstellung.

Two embodiments of a cutting press, which reveal further advantages and features of the invention, are shown schematically in the following drawings. Show it:

• Figure 1 is a plan view of a cutting press according to the invention in a partially sectioned representation.
• Fig. 2 is a section along the line II-II of Fig. 1;
• Fig. 3 is a section along the line III-III of Fig. 2;
• Fig. 4 just enlarged section along the line IV-IV of Fig. 1;
• Fig. 5 is an enlarged view of the detail 59 in Fig. 2;
• 5a shows a view according to arrow Va of FIG. 5;
• Fig. 6 is a section along the line VI-VI of Fig. 1;
• Fig. 7 is a section along the line VII-VII of Fig. 1;
• 8 shows a cutting press corresponding to a section according to II of FIG. 1 but with a different tool holder;
• FIG. 9 shows an enlarged illustration of the tool holder according to FIG. 8;
• Fig. 10 is a view according to arrow X of FIG. 9 in a partially sectioned representation.

1 in FIG. 1 denotes the stationary machine frame of a cutting press, by means of which flat, flat, workpieces can be cut without cutting. The workpiece to be machined lies on both sides of a work station 67 on sheet metal supports 26, 27 which are firmly connected to the machine frame 1.

To the side of the sheet metal supports is a ball screw 19, which is supported on the machine frame 1 via spindle end bearings 23, 24. Adjacent to the spindle end bearing 23 is a servo motor 25 for driving the ball screw 19. In this way, a transverse carriage 18, on which a ball nut 20 which is in engagement with the ball screw 19 is fastened, can be driven on both sides in the direction of the arrows X. The cross carriage 18 carries - seen in the direction of the arrows X - spaced-apart clamping elements 22 which serve to hold a workpiece, not shown here. The design of the clamping elements 22 is arbitrary.

The machine frame has in the area of the work station Zugpfeiler 97, 98, which will be described in more detail below.

Below the sheet metal support 26 is a conveyor belt 29, via which the metal scrap accumulating in the area of the work station 67 is removed. The finished parts are removed via a conveyor belt 30 located below the sheet support 27 and reach this by pivoting a flap 28 which is pivotally mounted about an axis lying in the drawing plane of FIG. 1. This will be discussed in more detail below.

The invention is characterized by U-shaped tool holders 15, which will also be described in more detail below terized, one of which is located in the work station 67 via slideways 16 of the machine frame is slidably guided. To the side of the sheet metal supports 26, 27 is a tool magazine 75, which in the present case is provided with holding devices for holding seven tool holders 15. These receiving devices are designed as guideways 91. It can be seen that in Fig. 1 a guideway 91 does not contain a tool holder 15 since it is located in the work station 67 and that the guideways 91 of the tool magazine 75 can be brought into an alignment with the guideways 16 of the machine frame.

The tool magazine 75 is mounted on a guide track 73 (FIG. 2) in the direction of the arrows X so that it can be moved by a motor. For this purpose, there is a servo motor 79 on the machine frame 1, which drives a ball screw 74, which is mounted on the machine frame 1 at both ends and is in engagement with a ball nut 7b (FIG. 2), the arrangement and fastening of which will be discussed in more detail below.

Is on the side of the machine frame 1
a ball nut 62 is mounted, which is in engagement with a ball screw 61, one end of which is coupled in a manner yet to be described to the tool holder 15 located in the work station 67. The ball screw 61 is used to implement a drive for the tool holder in the direction of the arrows Y.

Lifting rails 77 extend on both sides of the guideways 73 at one end of the machine frame and serve in a manner to be explained to transfer a tool magazine 75 into a magazine station 88. The magazine station 88 is identified by guide rails 80 draws, which are substantially perpendicular to the lifting rails 77 and serve to guide a sliding carriage 81. The sliding carriage 81 can be moved on these guide rails 80 essentially between the stations 84, 85 and 86, preferably by means of a drive, not shown here. On the sliding carriage 81 there are receiving rails 82, the lateral distance of which corresponds to that of the lifting rails 77. These receiving rails 82 are otherwise designed and arranged in connection with the sliding carriage 81 in such a way that they can be brought into a position aligned with the lifting rails 77. The part of the machine frame 1 in which the lifting rails 77 extend represents a transfer station 83 which serves to transfer a tool magazine 75 into the magazine station 88. This will also be explained in more detail below.

The magazine station 88 serves both to enlarge the tool reservoir available for mechanical processing and to load the cutting press with other tools or to replace individual tools.

It can be seen from the preceding illustration that in the cutting press according to the invention there is a feed system for the workpiece in the X direction, which essentially consists of the ball screw 19 and to which the reference number 90 is assigned, and a feed system for the tool in the Y direction, which is essentially formed by the ball screw 61 and to which the reference number 89 corresponds.

In Fig. 2 and all other figures, functional elements that correspond to those of Fig. 1 are numbered accordingly, so that a related repeated description is omitted. It can be seen in FIG. 2 that the cross carriage 18 is guided on a table guide rail 17 attached to the machine frame 1, the fastening of the tensioning elements 22 being carried out with the interposition of tensioning rails 21.

The ball nut 62 assigned to the feed system 89 is driven via a gear 63, which meshes with the pinion 69 of a servo motor 71 via a toothed belt 64. The servo motor 71 is fastened to the machine frame 1 in a manner not shown in detail.

The end of the ball screw 61 facing away from the gear 63 carries a coupling element 59 which establishes the connection to the tool holder 15 and which will be described in more detail below. The tool magazine 75, shown here in simplified form, is supported on a magazine carriage 72, the latter of which is slidably guided on the guide tracks 73 perpendicular to the plane of the drawing in FIG. 2. For this purpose, a ball nut 78 is fastened to an underside of the magazine slide 72 and engages with the ball screw 74. The tool magazine 75 is fixed on the magazine carriage 72 by means of special centering devices 76, which act in a form-fitting manner and are explained in more detail.

The lifting rails 77 extending parallel to the side of the guideway 73 can also be seen. The lifting rails 77 are supported on piston-cylinder units 87, so that there is the possibility of lifting or lowering the lifting rails 77 in the direction of the arrows 108. The centering devices 76 are also equipped as piston-cylinder units, the cylinders of which are fastened to the magazine slide and the piston rods of which can be inserted into bores of the tool magazine 75 and lock it in this way.

The already mentioned tension pillar 97 is connected to the tension pillars 98 not numbered in FIG. 2 via a bridge 2 which extends essentially horizontally in the upper part of the cutting press. Supported on the bridge 2 is a toggle lever bearing housing 11, within which a pair of toggle levers 9 arranged horizontally at a distance from one another can be actuated by a pull rod 8. The toggle levers 9 are on the one hand pivotally attached to the toggle lever bearing housing via toggle lever bolts 12 and to a pressure plate 10 via toggle lever bolts 12 '. A respective tie rod bolt 13, which is common to a pair of toggle levers 9, connects this to a tie rod 8, the end of which is remote from the toggle levers 9 is connected via a connecting rod bolt 14 to a connecting rod 7 of an eccentric shaft 6. The eccentric shaft 6 is driven by a motor 4 via a flywheel 5 and a belt 93. Clutch and brake elements, which are functionally arranged between the flywheel 5 and the eccentric shaft 6, are not shown in the drawing. The attachment of the engine 4 including the bearing of the flywheel 5 and the eccentric shaft 6 takes place on the machine frame 1. It can be seen that a rotation of the eccentric shaft 6 results in a movement of the pull rod 8 in the direction of arrows 92, whereby the pressure plate 10 corresponds to the Eccentricity of the eccentric shaft 6 experiences a shift in the direction of the arrows 108.

With 3 support rails are designated, which are attached to the machine frame 1 and serve to attach the tool holder 15 in a manner yet to be explained. The latter takes place in the region of the guide head 96 arranged at one end of the tool holder 15 by means of a groove 39, which is discussed in more detail below will be gone.

3 shows the tool set held in detail in a tool holder 15. This consists of a die 35, a stripper 45 and a punch holder 42 with a punch 43. As already mentioned, the tool holder 15 is U-shaped, the U being in a lying arrangement. Its lower arm 31 is provided with a bore 36 which serves to receive the die 35, while the guide head 96 is fastened in the upper arm 32. This attachment is carried out by means of grooves 39 which extend essentially horizontally on both sides and into which guide lugs 40, which are formed on the support rails 3 which extend on both sides of the guide head 96, engage. The scraper 45 is fastened in a scraper shoe 44 which is held in it by scraper bolts 46, which also extend through the guide head 96. At their end facing away from the scraper shoe 44, the scraper bolts 46 are supported with the aid of spring elements 47 in enlarged bores 50 of the guide head 96 in each case. The spring elements 47 are supported at their ends facing away from the bores 50 on the heads of the wiper bolts.

A feather key 99, which is fastened to the guide head 96 and is guided in a guide groove 100 of the stamp holder 42, serves to secure it against rotation within the guide bore 41, within which the stamp holder is arranged.

To actuate the scraper shoe 44 via the scraper bolts 46 guided in bores 51, actuating rails 52 are guided in the toggle lever bearing housing 11 in a manner to be described in greater detail - perpendicular to the plane of the drawing in FIG. 3. This tour takes place via this actuating rails 52 attached guide lugs 53 which extend substantially perpendicular to the plane of FIG. 3, which are engaged with corresponding guide grooves 54 of the toggle lever bearing housing 11.

The stamp holder 42 is provided with a coupling pin 48, which is T-shaped in the plane of FIG. 3 and is slidably guided in a correspondingly formed longitudinal groove 49 of the pressure plate 1 - seen perpendicular to the plane of FIG. 3. The coupling pin 48 is used to transmit a compressive force to the plunger 43 in the direction of the arrows 109.

It can also be seen in FIG. 3 that the pressure plate 10 is provided with guide lugs 94 running laterally on both sides, which are in engagement with corresponding grooves running parallel to the arrows 109. In this way, the pressure plate 10 is positively secured in a direction perpendicular to the plane of FIG. 3.

37 with a hole in the lower arm 31 of the tool holder 15 is designated, through which the scrap resulting from cutting or punching is discharged downward.

FIG. 3 also shows the exact design of the guide for the lower part of the tool holder 15. The lower part of the latter is profiled in the lower region — seen in the plane of the drawing in FIG. 3 — in the manner of a T, the lateral legs 33 being designed accordingly Guide path 110 of the machine frame 1 are guided. The legs 33 are also secured in the vertical direction by cover rails 34.

3 with a slot in the machine frame 1 is indicated in FIG. 3, which is aligned with the hole 37, the discharge of the resulting scrap and extends - perpendicular to the drawing plane of FIG. 3 - in a length which corresponds to the displaceability of the tool holder 15 in the work station 67.

It can be seen from the synopsis of FIGS. 1 to 3 that the U-shaped tool holder 15 in the guide 16 and the grooves 39 arranged laterally in the support rails 3 are guided relative to a stationary drive via the pressure plate 10, during which In the Y direction (FIG. 1), the coupling with the stationary drive is carried out via a coupling pin 48, which is slidably guided in a longitudinal groove 49 perpendicular to the drawing plane of FIG. 3. The masses to be moved in the Y direction when moving the tool are kept small in this way.

Fig. 4 shows in particular the design and arrangement of the scraper bolts 46 which are guided in bores 51 and on which the actuating rails 52 can be used. The actuating rails 52 extending on both sides in the longitudinal direction of the tool holder 15 are fastened to one another at their ends via connecting pieces 55, 55 '. Starting from the connecting piece 55, the upper edges of the actuating rails 52 run inclined towards the connecting piece 55 ′, these inclined upper edges being numbered 102. These upper edges 102 engage with correspondingly inclined guide surfaces 103 of the toggle lever bearing housing 11. In addition, the piston rod 57 of a piston-cylinder unit 56 is connected to the connecting piece 55, the cylinder of the latter being fastened to the toggle lever bearing housing 11 in a manner not shown, via a bracket 58. It can be seen that by pressurizing the piston-cylinder unit 56 a movement of the piston rod 57 and thus the Actuating rails 52 in the direction of arrows 110 can be effected, whereby, due to the interaction of the obliquely running upper edge 102 in connection with the mentioned guide surfaces 103, vertical movements of the operating rails 52 in the direction of arrows 111 can be triggered, which immediately corresponds to vertical movements of the stripper bolts 46 Consequence. The scraper shoe and thus the scraper are advanced over the latter.

With 60 a coupling piece is designated, which is provided with a bore 112, the operation of which will be described in more detail below.

5 and 5a show how the ball screw 61 can be coupled to a tool holder 15. For this purpose, the end section of the ball screw 61 is supported in a fork part 106, which is slidably supported by a guide shoe 66 in the guide track 91 of the tool magazine 75 or the guide track 16 of the machine frame 1. The guide shoe 66 consequently has a profile which is adapted to the dimensions of the lower arm 31 of the tool holder 15 which is T-shaped in cross section according to FIG. 3. It can be seen from FIG. 5a that the guide track 91 of the tool magazine 75 is also partially covered by cover rails 34.

The fork part 106 forms a coupling part 106 'and ends on its end remote from the ball screw 61 in two vertically spaced holding elements which are each provided with mutually aligned bores 105. The hole 112 present in the coupling piece 60 of a tool holder 15 already mentioned is arranged in connection with this coupling part 1o6 such that it is in an aligned arrangement with the holes 105 of the fork can sometimes be brought 106.

The fork part 106 also supports, supported on a bracket 113, the cylinder of a piston-cylinder unit 68, the piston rod 104 of which carries a locking cylinder 114 which can be introduced into the bores 105 and 112. It can be seen that by actuating the piston-cylinder unit 68, a tool holder 15 is coupled to the ball screw 61 in this way, and in this way the tool holder 15 can be moved in the Y direction (FIG. 1) relative to a workpiece.

Fig. 6 shows the more precise position of the conveyor belts 29 and 30 below the sheet supports 26 and 27. The metal scrap resulting from the stamping process is then transported via the conveyor belt 29 into a waste container 70, whereas the finished stamped parts are transported onto the conveyor belt 30 via the flap 28 pivoted into the position 28 ′ about an axis 115 running perpendicular to the plane of the drawing in FIG. 6 arrive and from this are fed to a stacking device 107. In the present part, the stacking device 107 is essentially designed as a simple angle plate.

Fig. 7 shows the exact design of the drive of the tool magazine 75 in the X direction. For this purpose, the ball nut 78 is fastened to the magazine slide 72 and engages with the ball screw 74, so that by rotating the latter by means of the servo motor 79, the tool magazine held on the magazine slide 72 by means of the centering devices 76 can be moved overall in the X direction.

In a complete process into the transfer station 83, after loosening the centering devices 76 and lifting the lifting rails 77 by means of the piston-cylinder units 87, the tool magazine 75 can then be Direction on the receiving rails 82 are transferred. This process from the lifting rails 77 to the receiving rails 82 can also be carried out by means of a drive, not shown here in the drawing. In the magazine station 88 located to the side of the transfer station 83, the tool magazine 75, which is located here on a sliding carriage 81, is slidably mounted perpendicular to the plane of the drawing in FIG. 7.

8 to 10 show a variant of the subject matter of the invention, in which, instead of U-shaped, coherent tool holders 15, two-part tool holders 15 'are provided in a tool magazine 17, each of which consists of a punch holder guide 21 and a separate die guide 65. The tool magazine 17 consists of a magazine base plate 70 and a magazine cover plate 95, which in turn are connected to one another by laterally spaced magazine partitions 96. The magazine partitions 96 are each equipped with a pair of substantially horizontally extending transfer rails 143 for the stamp holder guide 21 and for the die guide 65. These transfer rails 143 have a lateral spacing and a configuration which corresponds to the guide lugs 40 of the support rails 3 and interact with them in a manner to be explained in more detail.

The punch holder guide 21 and the die guide 65 are provided on both sides with guide grooves 144 which are dimensionally matched to the transfer rails 143 and can be brought into engagement therewith. Accordingly, both the punch holder guide 21 and the die guide 65 when inserted into the tool magazine 17 up to a stop, which for the punch holder guide 21 by an angle part 101 and for Die holder 65 is determined by an angular part 105, inserted. In this position, both the _St empelhalterführung 21 and secured the die pocket 65 in the magazine by spring-loaded latching pin 115 which can engage in corresponding bores 116 of the punch holder guide 21 and the die guide 65 with respect to the tool magazine 17th Both the punch holder guide 21 and the die holder 65 are - as can be seen in FIG. 9 - provided on one end with a T-shaped coupling piece 117, which serves to displace them in the Y direction with respect to the tool magazine 17.

For the purpose of such a displacement, a ball screw 118 is provided, one end of which is mounted in a connecting block 119 which is displaceable in the Y direction with respect to the machine frame 1 and the other end of which is mounted in a bearing block 120 which is fastened to the machine frame 1. The drive takes place via a toothed wheel 121, which is in engagement with the pinion 123 of a servo motor 124 via a toothed belt 122. Via a rotatably mounted ball nut 125, which is axially supported on the one hand with respect to the gear 121 and on the other hand with respect to the bearing block 120, the ball screw 118 can be advanced in the Y direction.

One end of the ball screw 118 facing away from the bearing block 120 carries a coupling part 126 which has a receiving groove 127 for receiving the coupling piece 117. The coupling piece 117 can be inserted perpendicularly to the plane of the drawing in FIG. 9 into the receiving groove 127. For fastening in this receiving groove 127, the coupling part 126 carries a piston-cylinder unit 128, on the piston rod of which a clamping part 129 is attached, which is designed to engage behind the T-shaped coupling piece 117.

At a distance above the ball screw 118 extends a push rod 130, which is passed through the bearing block 120 and carries at its end a coupling part 126 'designed in accordance with the coupling part 126, which in the same way with a piston-cylinder unit 128', a receiving groove 127 'and a clamping piece 129' is equipped. The other arrangement of the coupling part 126 'is designed such that it can be used to detect the coupling piece 117 assigned to the stamp holder guide 21.

Inside the stamp holder guide 21, the stamp holder 42 is inserted into a stamp holder bore 131, the coupling pin 48 being held in a stamp holder groove 132 which is T-shaped in cross section and is incorporated in the magazine cover plate 95. The die .35 is in turn inserted into a receiving bore 133 in the die guide 65.

The tool magazine 17 or its magazine base plate 70 is locked in the horizontal direction on a magazine slide 134 by means of a plurality of piston-cylinder units 135, each of which is assigned a centering pin 136. The magazine carriage 134 is in turn mounted in a guideway 140 of the machine frame 1 so that it can be moved by a motor perpendicular to the plane of the drawing in FIG. 9, a method being carried out by means of a ball screw 138, which can be driven in a manner analogous to the ball screw 74 (FIG. 1) by means of a servo motor , wherein the drive of the magazine carriage 134 takes place via a ball nut 139 attached to it. With 137, lifting rails arranged on both sides of the guide track 140 are designated, which serve in a manner analogous to the lifting rails 77 according to FIG. 1 for separating the tool magazine 17 from the magazine carriage 134. For this purpose there are 137 piston Cylinder units 141, by means of which the tool magazine 17 can be raised relative to the magazine slide 134.

The punch holder groove 132 of the tool magazine 17 can be moved into a position in which it runs in alignment with the longitudinal groove 49 of the pressure plate 10. The machine frame 1 is also provided in its work station with a pair of guide lugs 142, which correspond in cross section to the transfer rails 143 and are arranged below the guide lugs 40. The lower transfer rails 143 of a tool magazine 17 can moreover be brought into a horizontally aligned arrangement with these guide lugs 142.

The mode of operation of the two different embodiments according to FIGS. 1 to 7 on the one hand and 8 to 10 on the other hand will be briefly discussed below.

It is essential for the first embodiment that the entire tool set is located in a coherent tool holder 15, the respective tool set being removable from a tool magazine 75. To move a specific tool set into the work station 67, the relevant tool set of the tool magazine is moved into the position suitable for insertion into the work station 67 by actuating the servo motor 79 and the tool set is then moved in the Y direction by actuating the servo motor 71. At the same time, the sheet metal to be machined, which is held on the cross carriage 18 via the clamping elements 22, can be moved in the X direction by means of the servo motor 25. By moving a tool magazine 75 into the transfer station 83 by means of the servo motor 79, Be actuation of the lifting rails 77 by means of the piston-cylinder units 87 assigned to them, a tool magazine 75 can be separated from the respective magazine carriage 72 and moved horizontally into the magazine station 88. The latter process is also expediently designed to be carried out by a motor. In principle, the magazine station 88 represents a warehouse for a large number of tool magazines, in which entire tool sets or tool holders can be exchanged at the same time while the work program is otherwise running. In the magazine station 88, the tool magazines 75 are mounted so as to be displaceable transversely to the X axis, that is to say in the direction of the Y axis. Also this shippin _h iebe- operation of the tool magazines 75 in the magazine station 88 is preferably of a motor. To replace a tool holder 15 inserted in the work station 67, the tool holder 15 must be withdrawn completely from the latter so that the tool magazine 75 can subsequently be moved in the X direction according to the position of the new tool holder 15 to be inserted. It is essential that when the tool set is moved, its drive, namely the pressure plate, because of the special design of the coupling device between the latter and the tool holder, does not participate in the feed movement in the Y direction. In this way, the masses to be moved during the feed movement of the tool are kept small. To carry out an actual punching or cutting press operation, the scraper 45 is first moved down to the sheet to be punched by activating the piston-cylinder unit 56, which is achieved by horizontal displacement of the actuating rails 52, through their oblique upper edge 102 in connection with the guide surface 103 of the toggle lever bearing housing 11, the wiper bolts 46 act against the action of the spring elements fixing them via the wiper shoe 44 on the wiper 45. The pressure is then transferred to the punch 43 via the toggle levers 9, the scrap resulting from the punching process falling through the slot 38 onto the conveyor belt 29 located below. The stamp is retracted by means of the toggle lever 9, while the scraper is retracted by activating the piston-cylinder unit 56 in the opposite direction.

In the embodiment according to FIGS. 8 to 10, the space required for the tool holder, which is not designed here as a unitary body, is reduced, but the kinematics of the movement sequences occurring during mechanical processing is similar to the embodiment described at the beginning. The set of tools located in the work station 67 is moved in the Y direction by means of the servo motor 124, a punch holder guide 21 and a die guide 65 being moved simultaneously with their locking by the locking bolts 115 along the transfer rails 143 and at the ends thereof by a further process in Y -Direction finally taken over by the guide lugs 40 and 142. At the same time, the coupling pin 48 of the punch 43 is pushed out of the punch holder groove 132 of the tool magazine 17 and into the longitudinal groove 49 of the pressure plate 10. The process of removal from the area of the printing plate 10 or the work station 67 is reversed. It can be seen that the tool magazine 17 can only be moved laterally, ie perpendicularly to the plane of the drawing in FIG. 8, if the coupling parts 126 and 126 ', which can only be moved together, are in the end position, which is shown in Fig. 8, since only in this position the respective tool set has been completely drawn into the tool magazine 17.

The numerous drive elements of the cutting press according to the invention are integrated in an NC or a CNC control. In the context of the preceding illustration, however, a description of the corresponding electrical functional elements such as position transmitters, limit switches and the like has been dispensed with.

Claims (20)

1. Cutting press for processing plate-like, on a work table of a machine frame (1) in a direction (X) rectilinearly motor-driven workpieces with a work station (67) in which there is a drive for the tool, which is in the work station (67) in in a direction (Y) essentially perpendicular to the direction (X), and at least one tool magazine (17, 75) in which the tool is held in the form of a plurality of complete tool sets for mechanical transfer to the work station (67) and into which tools removed from the work station (67) can be transferred, the tool sets being held in special tool holders (15, 15 '), characterized in that in the work station (67) the drive for the tool is stationary and only the tool holder (15,15 ') slidably mounted in the direction (Y) is that between the drive and the tool holder (15, 151, a displacement device bridging the displacement movements of the latter is arranged and that the tool magazine (17, 75) can be moved in the direction (X) by motor relative to the work station (67) on the machine frame (1) is arranged. 2. Cutting press according to claim 1, characterized in that the tool holders (15) are integrally formed. 3. Cutting press according to claim 2, characterized in that the tool holders (15) are U-shaped and arranged horizontally, the end regions of the respective upper (32) and lower arm (31) the tool, namely a punch (43) , a stripper (45) and a die (35). 4. Cutting press according to claim 3, characterized in that both the upper arm (32) and the lower arm (31) of the tool holder (15) are equipped with guide devices which cooperate with the machine frame (1) in such a way that the arms ( 31,32) are guided horizontally and are supported vertically on all sides. 5. Cutting press according to claim 1, characterized in that the tool holders (15 ') are formed in two parts, namely are divided into an upper and a lower part, which are each equipped with guide devices which cooperate with the machine frame (1) in that the parts are slid horizontally and supported vertically on all sides and that the tool held in the parts consists of a punch (43), a stripper (45) and a die (35). 6. Cutting press according to one of the preceding claims 1 to 5, characterized in that the coupling device consists of a vertically movable with a defined stroke motor coupling plate (10), that the coupling plate (10) is provided with a longitudinal groove (49), which extends in the direction (Y) and that the longitudinal groove (49) is designed for the vertical positive locking of a moving part of the tool, namely the punch (43). 7. Cutting press according to claim 6, characterized in that the punch holder (42) of the punch (43) is provided with a coupling pin (48) which is slidably guided in the longitudinal groove (49) in the direction (Y), but vertically on all sides is fixed. 8. Cutting press according to claim 6 or 7, characterized in that the pressure plate (10) against the machine frame (1) guided vertically, but is fixed horizontally on all sides. 9. Cutting press according to one of the preceding claims 6 to 8, characterized in that the pressure plate (10) with two, in the direction (Y) spaced pairs of toggle levers (9) is in communication that both pairs of toggle levers ( 9) are connected to one another via a common, essentially horizontally extending tie rod (8) and that the tie rod (8) can be driven to oscillate in its longitudinal direction. 10. Cutting press according to claim 9, characterized in that the pairs of toggle levers (9) in a with the machine frame (1) in fixed connection toggle lever bearing housing (11) are arranged in the the pressure plate (10) is slidably guided in an open end region and that the toggle levers (9) are pivotably supported on the one hand on the toggle lever bearing housing (11) and on the other hand on the pressure plate (10) via toggle lever bolts (12, 12 '). 11. Cutting press according to one of the preceding claims 3 to 10, characterized in that in the upper arm (32) or the upper part of the tool holder (15, 15 '), spring-loaded scraper bolts (46) are guided parallel to the punch (43) and that for the displacement of the scraper bolts (46), actuating rails (52) are slidably arranged on the machine frame (1), that the actuating rails (52) extend in the direction (Y) and essentially motor-slidingly in relation to the machine frame (1 ) are guided so that the actuating rails (52) are in sliding contact with the wiper bolts (46) with a longitudinal surface and that the actuating rails (52) each have a sliding surface inclined to the horizontal plane and in the direction (Y), which with correspondingly inclined surfaces Guide surfaces (103) on the machine frame (1) are in sliding contact. 12. Cutting press according to claim 11, characterized in that the actuating rails (52) extend in the direction (Y) on both sides of the pressure plate (10) and that the guide surfaces (103) are incorporated in the toggle lever bearing housing (11). 13. Cutting press according to one of the preceding claims 1 to 12, characterized in that the tool holders (15, 15 ') are equipped with coupling pieces (60, 117) which with coupling parts (106', 126, 126 ') of a drive system for displacing the tool holders (15,15 ') in the direction (Y) together Act. 1 ₄ . Cutting press according to claim 13, characterized in that the coupling parts (106 ', 126, 126') of the drive system are motor-switchable. 15. Cutting press according to claim 13 or 14, characterized in that the drive system consists of a ball screw (61, 118), one end of which is mounted on the machine frame (1) via a motor-driven ball screw nut and the other end of which / the coupling part / coupling parts ( 106 ', 126, 126'). 16. Cutting press according to one of the preceding claims 13 to 15, characterized in that with a two-part tool holder (15 ') the upper and lower parts have a coupling piece (117), that each coupling piece (117) has a coupling part (126, 126' ) of the drive system is assigned such that one coupling part (126) can be moved in the direction (Y) via a ball screw (118) and the other coupling part (126 ') via a push rod (130) extending parallel to the ball screw (118) and that the push rod (130) is kinematically coupled to the ball screw (118) via a connecting block (119). 17. Cutting press according to one of the preceding claims 1 to 16, characterized in that the tool magazine (17, 75) can be moved on the machine frame (1) with the interposition of a magazine carriage (72, 134). 18. Cutting press according to claim 17, characterized in that the tool magazine (17, 75) on the magazine slide ten (72,134) is mechanically controllable, but is detachably centered. 19. Cutting press according to claim 17 or 18, characterized in that the tool magazine (17, 75) between the work station (67) and a Ma ^g azinstation (88) is preferably motor-driven, that the magazine station (88) for receiving a variety of Tool magazines (17, 75) is set up and that any tool magazines (17, 75) can be transferred from the magazine station (88) to the work station (67) and vice versa. 20. Cutting press according to claim 19, characterized in that the tool magazines (17, 75) located in the magazine station (88) can be moved essentially transversely to the direction of travel of the magazine carriage (72, 134).

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