EP2862684A1 - Punching machine with device for adjustment - Google Patents

Abstract

The invention relates to a Flachbettstanz- and / or embossing machine (100) having a punching and / or -prägestation (2) comprising an upper table (10) and a lower table (9), wherein according to the invention the lower table (9) a plurality of matrix-like having juxtaposed metal blocks (101), eg of aluminum, and wherein each metal block (101) has an independently controllable heating device (104) for selectively heating a respective metal block (101). The heating advantageously causes an expansion of the metal block (101), so that a surface can be modeled for trimming the punching and / or embossing station (2) with the metal blocks (101).

Description

The invention relates to a flat bed punching and / or embossing machine according to the preamble of claim 1, claim 9 and claim 10.

State of the art

As punching the cutting is referred to with closed geometric blank forms that can be circular, oval or polygonal and imaginary shapes of all kinds. Also the practices practiced in print finishing, such as punching with punch, corner punching and register punching are counted to this area. The punching takes place against a punching pad or against stamp, in some cases it is also shearing operations. Packaging materials made of paper, cardboard, cardboard or corrugated board are mainly punched in sheet format but also as webs. Even materials such as film (in-mold), various thin plastics or aluminum foil can be processed accordingly. When punching but also creasing lines or blind embossing can be introduced into the benefit. This complex process makes it indispensable to punch the sheets individually. Since the end products are sophisticated packaging in terms of technical and graphic design (such as packaging for cosmetics, cigarettes, pharmacy, food, etc.), special requirements are not only placed on the packaging materials themselves, but are also punching tools for optimum results required with the smallest tolerances and extremely precise and reliable punching machines. Flatbed punching best meets these demands.

In flatbed sheet punching machines, the printed sheets stacked on a pallet are fed to the punching machine. In the machine, the sheets to be punched are precisely aligned in an alignment device, taken over by a gripper carriage and exactly in the punching device between a fixed undercounter and a vertically movable by means of eccentric gear top table positioned. Alternatively, machines are known in which the upper table is fixed and for the punching operation of the lower table is moved by means of a toggle lever against the upper table. Also known are flat bed web punching machines that further inline webs coming from web presses.

In known sheet punching and embossing machines, which are used for punching, breaking, embossing and depositing sheets of paper, cardboard and the like, it is known to move the sheets by means of gripper carriage through the individual stations of the machine. A respective gripper carriage has a gripper bridge, to which grippers are fixed, which grasp the arches at a front end. A gripper carriage further has lateral carriages, which are connected to endless chains of the transport system and whereby the gripper carriage to be moved by the machine. By this type of movement of the sheets through the machine, a continuous work in the individual successively arranged stations of the machine, in particular punching, break-away and Nutzentrennstation allows.

Such a flat bed punch is for example from the DE 30 44 083 A1 known. The two tables, also referred to as crucibles, are equipped with cutting and scoring tools or corresponding counter tools with which the benefits punched out of the cyclically guided between the table surface sheets and at the same time pressed the necessary for clean folding grooves. In the subsequent breakout the waste is removed by machine tools. Depending on the equipment of the machine finally the punched benefits can be separated in a designated Nutzentrenneinrichtung.

In order to obtain high quality products, the punching pressure in the sheet punching and embossing machine must be adjustable according to the sheet being processed.

Like in the DE 30 44 083 C3 described, this is done by moving wedge-shaped steel plates. These steel plates are located between eccentric shafts and the driven upper table. By moving the wedge-shaped steel plates, the distance between the moving upper table and fixed lower table, and thus the punching force, is changed.

Common to the various prior art punching force adjusting devices is that the punching force can only be adjusted globally, i. based on the entire surface of the crucible. Due to the design, however, an uneven punching force distribution over the surface of the crucible is present in all stamping and embossing machines according to the prior art. The punching force is introduced via individual force introduction points and thus does not affect the entire crucible surface. Depending on the rigidity of the crucible results in a deformation, which in turn results in an uneven punching pressure distribution over the surface of the crucible. Also height differences of the punching or Rillmesser, as well as the wear of the knife cause an uneven punching pressure distribution. The unequal punching pressure in turn causes an unclean cutting of the cutting blade of the punching tool or an insufficient pronounced creasing by the creasing blades of the stamping tool.

In the prior art, this problem is solved by the punching and Rillmesser be individually highlighted. Depending on the deviation from the nominal punching force, the punching and scoring blades on the rear side of the tool are glued behind with paper or plastic strips of various thicknesses. This so-called trimming is very time-consuming and must be done at machine standstill. Depending on the number of punching and creasing knives and the shape to be punched, trimming can take several hours. The high set-up time reduces the machine productivity in a row.

The DE 35 31 114 A1 describes a method and a device for pressurizing a press for producing embossing tools. The press is operated separately and independently of a sheet punching and / or embossing machine. The press has a large number of hydraulic pistons which carry a pressure plate. The pressure plate serves to emboss the tools. The pistons can be electrically controlled via a control panel, whereby the pressure build-up on the pressure plate can be varied precisely and specifically.

The DE 39 07 826 C2 describes an apparatus for producing stamping tooling, namely an impression machine. In order to relocate the punching tooling in the impression machine is in a first step captures the topography of the crucible of the punching machine. The topography of the crucible is then simulated in the impression machine below. This makes it possible that the punching tools can be dressed in the impression machine and the punching machine can continue to operate during this trimming. The effort for trimming the punching tools is not reduced thereby.

The DE 10 2007 014 317 A1 discloses a sheet punching and embossing machine with a punching station, the crucible is provided with a device for regulating the punching or embossing pressure. In this case, a plurality of actuator elements such as piezo elements, hydraulic chambers or electric motors are distributed over the device.

task

The object of the present invention is to provide a flatbed punching and / or embossing machine which reduces the disadvantages of the prior art and which reduces the set-up time and thus increases the productivity of the machine.

This object is achieved by Flachbettstanz- and / or -prägemaschinen with the features of claim 1, claim 9 and claim 10th

The Flachbettstanz- and / or embossing machine according to the invention for processing flat elements, in particular of paper, cardboard, cardboard or plastic has a punching and / or -prägestation with an upper table and a lower table, one of which is liftable and at least one with a Punching and / or embossing tool is equipped. According to the invention, the undertable has a plurality of matrix-like juxtaposed, in particular cuboid metal blocks, each metal block having an independently controllable heating means for selectively heating or heating a respective metal block for trimming the punching and / or embossing station by local deformation of the surface of the undertable , Advantageously, the heating means of the metal blocks are controlled in such a way that, due to the thermal expansion of the metal blocks, a deformation of the undertable results, which corresponds to a respective required dressing requirement.

In a particularly advantageous and therefore preferred embodiment of the invention Flachbettstanz- and / or -prägemaschine a respective heater is designed as a heating cartridge with control unit, wherein a respective heating cartridge, such. B. offered by Watlow under the product name "firerod", in particular has a heatable resistance wire. Such cartridges are inexpensive, clever in the assembly, resistant and accurate in their control.

It is particularly advantageous if a bus system is provided for controlling the heating cartridges, wherein in each case the control unit of a heating cartridge is connected in terms of data transmission technology via the bus system to a machine control system. By means of this activation, it is achieved that a respective metal block can be heated in such a way that a thermal expansion and, consequently, a required finish result.

In an advantageous development of the flat bed punching and / or embossing machine according to the invention, the latter has a data memory for storing a machine-dependent and / or a tool-dependent dressing requirement and the dressing requirement can be converted into a heat distribution such that the heating cartridges can be individually controlled by the machine control system. that by heating the heating cartridges an expansion of the metal blocks and therefrom a dressing of the tool.

In an advantageous embodiment, the metal blocks are designed as aluminum cuboid.

Furthermore, it is considered advantageous if an insulation layer is provided as a thermal insulation between the individual metal blocks. The thickness or effectiveness of the insulating layer can be designed differently, depending on the position of the metal block. So z. B. a metal block located on the edge have a thinner insulation layer than a metal block surrounded by further metal blocks. The insulation layer does not cause heat from one metal block to another can be transferred adjacent metal block. In an advantageous development, a respective metal block may be provided with a cooling element, in particular on its lower end face. The cooling element may be, for example, a metal plate, which dissipates the heat introduced by the heaters.

In an advantageous development, a respective heating cartridge has a temperature sensor and can be controlled via the bus system.

In order to enable easier maintenance and interchangeability of the metal blocks, in each case a plurality of metal blocks can be combined to form a unit, in particular a latch. A respective latch can be individually connected to the table.

In a first alternative embodiment variant, the flat-bed punching and / or embossing machine has a punching and / or embossing station with an upper table and a lower table. According to the invention, a hollow chamber plate with a plurality of matrix-like juxtaposed chambers is provided in the region of the undertable or behind an upper tool of the upper table, wherein the chambers are filled with a rheological fluid and wherein the viscosity in a respective chamber by means of a current-conducting bus system by changing the Rheology of the liquid is individually adjustable. By a location-precise control of the viscosity in the respective chambers, a dressing of the punching and / or embossing station can be carried out in an advantageous manner.

In a second embodiment of the Flachbettstanz- and / or embossing machine this also has a punching and / or -prägestation with an upper table and a lower table. According to the invention, in the region of the undertable or behind an upper tool of the upper table, a hollow chamber plate is provided with a multiplicity of chambers arranged next to one another in a matrix, the chambers being designed as tubes communicating with one another and filled with a hydraulic fluid, the pressure being individually adjustable in a respective chamber. These can be the Chambers connected to each other by means of valves and may be provided a reservoir for the hydraulic fluid. By a targeted regulation of the pressure in a respective chamber, a dressing of the stamping and / or embossing station can be carried out in an advantageous manner.

Different types of valves can be used: controllable microvalves which are known from the field of active microfluidics and can be constructed, for example, from monocrystalline silicon, can each connect the chambers. After the conditions required for the dressing have been set, the valves remain closed during a respective punching operation. When a job is changed, the microvalves are opened, the conditions redetermined and the pressure in each chamber adjusted.

Another embodiment is check valves or check valves. These form a kind of flap between the chambers. These flaps allow the hydraulic fluid to get into the adjacent chambers, including two flaps, one per direction needed to be able to regulate the pressure level in the chambers variable. The flaps would have to be actively locked and opened.

Another approach is the use of pressure valves or pressure relief valves or membranes: The chambers are each connected via two pressure valves or diaphragm and the hydraulic fluid is by their specific properties in the position, alone by the influence of dynamic pressure conditions during a particular stamping process Establish pressure level in the chambers so that the required dressing sets. This could be dispensed with control of the valves or diaphragm.

In all variants, all chambers are connected to each other by said embodiments of the valves.

The described invention and the advantageous developments of the flat bed punching and / or embossing machine described also provide advantageous developments of the invention in combination with one another.

With regard to further advantages and constructive and functional advantageous embodiments of the invention, reference is made to the dependent claims and the description of exemplary embodiments with reference to the accompanying figures.

embodiment

The invention will be explained in more detail with reference to attached figures. Corresponding elements and components are provided in the figures with the same reference numerals. In favor of a better clarity of the figures was waived a true to scale representation.

Fig. 1

eine Flachbettstanz- und/oder -prägemaschine in einer Übersichtsdarstellung

Fig. 2

die Metallklötze in einer Detaildarstellung

Fig. 3a

die Metallklötze und ihre Ansteuerung in einer Detaildarstellung

Fig. 3b

einen Riegel von Metallklötzen

Fig. 4

die matrixartige Anordnung der Metallklötze

Fig. 5a

eine Hohlkammerplatte als alternative Lösungsvariante

Fig. 5b

die Hohlkammerplatte gefüllt mit rheologischer Flüssigkeit

Fig. 5c

die Hohlkammerplatte aufweisend eine Vielzahl von miteinander kommunizierenden Röhren, gefüllt mit Hydraulikflüssigkeit.

It show in a schematic representation

Fig. 1

a Flachbettstanz- and / or embossing machine in an overview

Fig. 2

the metal blocks in a detail view

Fig. 3a

the metal blocks and their control in a detailed view

Fig. 3b

a latch of metal blocks

Fig. 4

the matrix-like arrangement of the metal blocks

Fig. 5a

a hollow chamber plate as an alternative solution variant

Fig. 5b

the hollow chamber plate filled with rheological fluid

Fig. 5c

the hollow chamber plate having a plurality of communicating tubes filled with hydraulic fluid.

In FIG. 1 the basic structure of a sheet punching and embossing machine 100 for punching, breaking, Nutzentrennen and storing sheets of paper, cardboard, plastic and the like is shown. The punching and embossing machine 100 has a feeder 1, a punching station 2, a breaking station 3 and a boom 4 with storage and pay station, which is supported by a common machine housing 5 and are enclosed and driven by a main drive 17. From one side, the so-called operator side, the processing stations 2, 3, 4 are accessible; on the opposite side, the so-called drive side, there is the drive train of the sheet punching and embossing machine 100. A machine control 15 controls the processes within the punching machine 100.

The sheets 6 are separated by a feeder 1 from a stack 6.1 by a so-called suction head 18, fed to the sheet transport system 7 and gripped by gripper bars of a gripper carriage 8 grippers at its front edge and intermittently in the sheet transport direction B through the various stations 2, 3 and 4 the punching and embossing machine 100 pulled through.

The sheet transport system 7 has a plurality of gripper carriages 8, so that a plurality of sheets 6 can be processed simultaneously in the various stations 2, 3 and 4. The gripper carriage 8 can be driven by a chain drive.

The punching station 2 consists of a lower crucible, a so-called. Subtable 9, and an upper crucible, a so-called. Obertisch 10. The upper table 10 is vertically reciprocally mounted and provided with an upper tool 30 with punching and Rillmessern. The lower table 9 is fixedly mounted in the machine frame and provided with a counter-plate 20 to the punching and Rillmessern. Alternatively, the upper table 10 fixed and the lower table 9 may be moved. When embossing, embossing tools, in particular in the form of so-called embossing dies, are used instead of the punching and scoring tools. In the lower table 9, a plurality of metal blocks 101 is integrated, which effect the dressing of the lower table 9. In addition, the lower table 9 can be provided with an active cooling 101. As an alternative to the metal blocks 101, in a variant which is not shown, hollow-chamber plates 200 may instead be arranged behind the upper tool 30 and / or behind the lower tool 20, which effect trimming of the respective tool 20, 30.

The gripper carriage 8 transports the sheet 6 from the punching and embossing station 2 in the subsequent breaking station 3, which is equipped with breakout tools 21, 23. In the stripping station 3 are using the stripping tools 21, 23 not required pieces of waste 11 pushed out of the sheet 6 down, causing the waste pieces 11 fall into a pushed-in under the station carriage-like container 12 or be transported away from there.

From the breaking station 3, the sheet 6 enters the boom 4, where the sheet 6 is either simply stored, or at the same time there is a separation of the individual benefits of each sheet 6. The boom 4 may also include a pallet 13, on which the individual sheets 6 or benefits in the form of a stack 14 are stacked, so that after reaching a certain stack height, the pallet 13 with the Sheet stack 14 can be moved away from the area of the punching and embossing machine 100. In order not to have to stop the machine 100 during the stack exchange, auxiliary stacking devices can be used.

In FIG. 2 are the metal blocks 101, which serve the finishing of a punched annular plate 20 and thus the dressing of the punching and / or -prägestation 2, shown in more detail. A respective metal block 101 is surrounded by an insulating layer 108a to 108f. As an alternative to the insulating layer 108f attached to the lower end face of the metal pad 101, there may be attached a metal plate as a cooling element 110 which serves to dissipate heat introduced by the heating cartridges 104.

Integrated into a respective metal block 101 is a heating cartridge 104. This heating cartridge 104 is driven by a control unit 105, which is likewise integrated in the metal block 101. By means of a respective control unit 105 it is possible to specify to which temperature a respective heating cartridge 104 is heated. This temperature is dependent on a required thermal expansion of a respective metal block 101, which in turn is required for the trimming of the punched annular plate 20 in the region of this metal block 101. The specification of a respective temperature, which is therefore conditioned by the thermal expansion behavior of the metal blocks 101 and a respective local dressing needs - as in the sectional view of FIG. 3a represented - transmitted via a bus system 106 to a respective control unit 105 of a metal block 101, for which purpose a unique address 107 is assigned. The required calculation, starting from a dressing requirement distribution, can be effected by a machine control 15. In an advantageous embodiment variant, a respective metal block 101 can have a temperature sensor 113, so that the actual actual temperature of the metal block 101 can be fed back to the machine controller 15 or a respective control unit 105, so that a temperature control is made possible. As in FIG. 4 12, the metal blocks 101 are juxtaposed in a matrix field 102 in rows m1, m2,... and columns n1, n2,..., and extend approximately over the surface of the lower table 9 and the punched annular plate 20. As in FIG FIG. 3b indicated, a plurality of metal blocks 101 may be combined to form bars 112, so that the metal blocks 101 can be maintained, repaired and replaced easier.

Instead of the above-described metal blocks 101 may be used for finishing the punching and / or -prägestation 2 also as in FIG. 5a shown hollow chamber plate 200 may be used, which has a plurality of matrix-like juxtaposed chambers 201. The chambers 201 may be designed in a non-illustrated alternative as honeycomb, eg hexagonal chambers.

In FIG. 5b a first embodiment of a hollow chamber plate 200 is shown in more detail. The chambers 201 of the hollow chamber plate 200 are filled with a rheological fluid 202. Connected to a respective chamber 201 is a current finger 206 for applying a current to the respective chamber 201 for adjusting the viscosity of the rheological fluid 202 in the respective chamber 201. The current fingers 206 are connected to a control unit 105 via a bus system 106 be controlled. By specifying a certain flow, the viscosity can be adjusted in the chamber 201 and thereby a locally required dressing can be effected.

In FIG. 5c a second embodiment of a hollow chamber plate 200 is shown. The chambers 201 of the hollow chamber plate 200 are filled with a hydraulic fluid 203. A pressure equalization between the respective chambers 201 is ensured via controllable valves 204. For superfluous hydraulic fluid 203, a reservoir 205 is provided. The valves 204 are via a bus system 106 from a control unit 105 can be controlled, so that it can be made a pressure control for each chamber 201. As an alternative to the controllable valves 204, valves 204 could also be provided which are not controllable and can only withstand a certain maximum pressure. If this pressure is exceeded, then hydraulic fluid 203 is discharged into a reservoir 205. A bus system 106 with connected control unit 105 is then not required. By adjusting the pressure in a respective chamber 201, a dressing of the punching and / or embossing station 2 can be carried out in an advantageous manner.

LIST OF REFERENCE NUMBERS

1

investor

2

Punching and / or embossing station

3

stripping

4

Outrigger, if necessary with Nutzentrennstation

5

machine housing

6

bow

6.1

sheet pile

7

Sheet transport system

8th

Gripper carriage with grippers

9

Lower table / lower crucible

10

Upper table / upper crucible

11

trimmings

12

container

13

palette

14

delivery pile

15

Control with interface and input devices

16

Feed table with a unit for aligning the bow

17

main drive

18

suction head

19

Lower tool with pins

20

Stanzrillplatte

21

Upper tool with pins or punches

23

Dividing grille or stripping board (intermediate tool)

30

Upper tool (punching tool)

100

Flatbed sheet punching and / or embossing machine (punching machine)

101

metalpiece

102

matrix field

103

-

104

Cartridge Heater

105

control unit

106

Bus system

107

unique address

108

isolation

108a

Insulation on a peripheral surface of a metal block

108b

Insulation on a peripheral surface of a metal block

108c

Insulation on a peripheral surface of a metal block

108d

Insulation on a peripheral surface of a metal block

108e

Isolation on the upper face of a metal block

108f

Insulation on the lower face of a metal block

109

-

110

Metal plate as a cooling element

111

active cooling of the undertable

112

Latch of metal blocks

113

temperature sensor

200

Multiwall sheet

201

chamber

202

rheological fluid

203

hydraulic fluid

204

Valve

205

reservoir

m1, m2, ...

Lines matrix field

n1, n2, ...

Columns matrix field

B

Sheet transport direction

e

Sheet transport plane

Claims (10)

Flat bed punching and / or embossing machine (100) with a stamping and / or embossing station (2) comprising an upper table (10) and a lower table (9),
characterized,
in that the under table (9) has a plurality of metal blocks (101) arranged next to one another in the form of a matrix, each metal block (101) having an independently activatable heating device (104) for targeted heating of a respective metal block (101). Flat bed punching and / or embossing machine according to claim 1,
characterized,
that a respective heating device is designed as a heating cartridge (104) with control unit (105). Flat bed punching and / or embossing machine according to claim 2,
characterized,
that a bus system (106) is provided for controlling the heating elements (104), wherein each said control unit (105) is connected to a heating element via the bus system (106) having a machine control (15) data transmission technology. Flat bed punching and / or embossing machine according to one of the preceding claims,
characterized,
that the Flachbettstanz- and / or embossing machine (100) has a memory for storing a machine-dependent and / or a tool-dependent Zurichtebedarfs. Flat bed punching and / or embossing machine according to one of the preceding claims,
characterized,
that the metal blocks (101) are designed as aluminum cuboid. Flat bed punching and / or embossing machine according to one of the preceding claims,
characterized,
that an insulating layer (108) is provided between the metal blocks (101). Flat bed punching and / or embossing machine according to one of the preceding claims,
characterized,
in that a respective metal block (101) is provided with a cooling element (110), in particular on its lower end face. Flat bed punching and / or embossing machine according to one of claims 3 to 7, characterized
that a respective heating element (104) has a temperature sensor (113) and via the bus system (106) is adjustable. Flat bed punching and / or embossing machine (100) with a punching and / or embossing station (2), comprising an upper table (10) and a lower table (9),
characterized,
that a hollow chamber plate (200) having a plurality of matrix-like arranged side by side chambers (201) is provided in the area of the sub-stage (9) or behind an upper tool (30) of the top table (10), said chambers (201) with a rheological fluid ( 202) are filled, wherein the viscosity in a respective chamber (201) by means of a current-conducting bus system (106) is individually adjustable. Flat bed punching and / or embossing machine (100) with a punching and / or embossing station (2), comprising an upper table (10) and a lower table (9),
characterized,
that in the area of the lower table (9) or behind an upper tool (30) of the Top table (10) is a hollow chamber plate (200) having a plurality of matrix-like juxtaposed chambers (201) is provided, wherein the chambers (201) designed as communicating tubes and filled with a hydraulic fluid (203), wherein the pressure in a respective Chamber (201) is individually adjustable.

Images