DE102009030115B3 - joining device - Google Patents

Abstract

There is a joining device (1) with a between a lower working position and an upper Bieben. For example, a hot stamping film (14) and a substrate (13) arranged below the hot stamping film (14) can be arranged between the stamp and the support table (12). The support table (12) is pivotally mounted about two perpendicular to each other and perpendicular to the axis of movement of the punch (11) standing pivot axes and by means of adjusting devices (18) pivotable about the two pivot axes, wherein the punch (11) forms a rigid abutment in the working position. Alternatively, the punch (11) is pivotally mounted about two perpendicular to each other and perpendicular to the axis of movement of the punch (11) standing pivot axes and pivotable by means of adjusting devices (18) about the two pivot axes, wherein the support table (12) forms a rigid abutment in the working position ,

Description

The The invention relates to a joining device for Joining two workpieces with one between a lower working position and an upper one filling up and down movable stamp, being between the stamp and the Auflagetisch a first workpiece and one under the first workpiece arranged second workpiece can be arranged.

To Such joining device counting for example, stroke embossing devices for the Hot stamping of Substrates, d. H. the at least partial application of a transfer layer a hot stamping foil on a substrate by the action of pressure and heat the hot stamping foil lying on the substrate. In the stroke embossing process becomes a hot stamping foil through a heated die made of metal or silicone in a continuous upward and downward movement transferred to the substrate. This determines the shape of the stamping die the form of the expression. The stroke embossing is suitable for, among others the crisp and positionally accurate application of single hologram images or for the sharp edge and applying creatives with partially trained area occupancy.

In dependence from the formation of the transfer layer to be transferred from the hot stamping foil to the substrate, in particular by locally different area occupancy of the transfer layer, can be advantageously provided to vary the embossing force locally. Different local imprinting forces are For example, by regional documents or by screws possible, which make it possible a stamping head or a support table for the one to be impressed Substrate slightly too tilt and so set different local embossing forces. adversely That is, the setting is usually done manually directly on the embossing device be made in the immediate vicinity of the hot stamping die must be that this is a lengthy process because the local embossing forces are not immediately measurable and / or not or only insufficiently comprehensible are and that high changeover times occur.

Further can to the o. g. joining devices Ultrasonic and high frequency welding devices are counted which are used, for example, to two workpieces To weld plastic together, such as car headlight housing or other multipart, to be welded plastic housing.

task It is the object of the present invention to provide an improved joining device specify.

According to the invention this Task with a joining device for joining two workpieces with one between a lower working position and an upper filling position moved up and down movable stamp, being between the stamp and the support table a first workpiece and one below the first workpiece arranged second workpiece can be arranged, it being provided that the support table swivel two perpendicular to each other and perpendicular to the axis of motion the stamp standing pivot axes is mounted and by means of adjusting devices is pivotable about the two pivot axes, wherein the punch in the Working position forms a rigid abutment, or that the punch pivotable about two perpendicular to each other and perpendicular to the axis of movement the stamp standing pivot axes is mounted and by means of adjusting devices is pivotable about the two pivot axes, with the support table forms a rigid abutment in the working position.

The inventive device offers the advantage of adjusting forces or local joining forces directly and so simplify the trimming work on the joining device and shorten. It is not necessary, therefore, by manual or manually disguised Set screws an inclination cause the joining pressure increased at the raised point. Another advantage is that the actuating forces during operation and of are remotely adjustable. A risk of injury through manipulation the stamp does not exist anymore. Long trial and experimentation is avoided, the set values can be read directly at any time and reproducible.

Of the Stamp is essentially perpendicular to the support table up and from movable. For the description of the stroke movement is for example a rectangular x-y-z coordinate system can be used in which the Lifting movement in the z-axis runs and the coordinates of the support table through the x and y coordinates are writable.

It can be provided that the first workpiece is a hot stamping foil, wherein the hot stamping foil at least one transfer layer and a carrier sheet has that the second workpiece a substrate to be embossed with at least a portion of the transfer layer is, and that the stamp is a heated die. Such as hot stamping devices known joining devices are used to sheetlike or To decorate three-dimensional substrates, wherein the transfer layer the hot stamping foil after joining or embossing adheres to the substrate and then removed the carrier film becomes. When removing the carrier film are also not transferred Remaining sections of the transfer layer deducted.

Further can be provided that the punch is a sonotrode. The sonotrode emits ultrasonic waves that interconnect the first and second workpieces weld. By the additional Pressure build-up between sonotrode and support table favors welding.

Further can be provided that the stamp is a high-frequency welding head. High frequency welding is preferably used for joining workpieces made of plastic. So can For example, car headlight housing two housing halves exist, by high-frequency welding connected to each other.

It can four adjusting devices may be provided, which in a preferably rectangular quadrangle are arranged, one being perpendicular to two mutually perpendicular axes pivoting joint in an area which has the intersection of the diagonal of the quadrangle arranged is. The joint may preferably be a ball joint act. When using the coordinate assignment described above is, it is the two perpendicular axes around the x and y axes.

It can Alternatively, however, also be provided three adjusting devices, the are arranged in a preferably isosceles triangle, wherein the pivotable about two mutually perpendicular axes in an area having the center of the triangle is disposed. The joint may preferably be a ball and socket joint.

The Control devices can designed as pneumatic or hydraulic actuating devices be, for example as a pneumatic or hydraulic cylinder. The adjusting devices can be directly acting, but also be coupled with gears to for example, to achieve a particularly sensitive adjustment.

In a preferred embodiment it can be provided that the adjusting device is a bellows cylinder is.

Further can the actuators as electromechanical actuators be educated. So can an electromechanical actuator for example, an electric motor and a self-locking Be formed gear. The transmission may be, for example to act a screw gear, in which a servomotor a screw spindle drives a non-rotating nut drives. As electric motor can advantageously be provided a stepper motor, so that on a particularly simple way a reproducible adjustment of the adjusting device is possible.

Further can be provided that cooperating with the adjusting devices Device has a rotation. At the said institution it can be the support table or the stamp plate of the stamp act. The rotation can, for example, by lateral guides be formed of a rectangular or square plate. It is but also possible, one provide round plate and the rotation by one or several in a groove-shaped recess the circular one Form plate engaging pin or pins or the like. The circular Plate can also have a tangential straight section, which interacts with a straight stop. It can continue at the circular Plate around a plate with a geometrically exact circular contour, but also a plate with an elliptical contour or with an arbitrarily curved Act contour.

Further can be provided that cooperating with the adjusting devices Device a stop to limit the travel of the adjusting devices having. This attack is particularly advantageous if the adjusting device is permanently subjected to force, which in particular can apply to pneumatic and hydraulic control devices. If it cooperates with the adjusting devices Institution for example, the support table, the Pad table a location outside take the intended adjustment, if the punch is not is in direct or indirect contact with the support table, d. H. outside the joining position is.

It can be provided that the stop as an adjustable stop is trained.

Further it can be provided that the device forming the rigid abutment pivotable about two perpendicular to each other and perpendicular to the axis of movement the stamp standing pivot axes is adjustable. It can do it This is, for example, the heated die a as a hot stamping device trained joining device act, in particular around the stamping plate of the Stamping die.

In An advantageous embodiment may be provided that the rigid abutment-forming device by means of screws pivotable is adjustable. As described above, so for example be provided that the stamping plate of the stamp is adjustable by means of screws.

It can also be provided that the device forming the rigid abutment is pivotally adjustable by means of documents. With the documents they may be, for example, metal platelets of different thickness, which can be inserted, for example, between the underside of the embossing plate and the upper side of the embossing plate holder.

Further can be provided that on the support table a receptacle for the substrate is arranged.

It can when as a hot stamping device trained joining devices be provided that the device is a storage and transport device for the Hot stamping foil having. The hot stamping foil can be provided for example on a supply roll and the after embossing withdrawn carrier layer can be wound on a take-up reel. For exact positioning the hot stamping foil For example, the film may have optical marks that be detected by optical sensors with a control device of the Collaborate transport device.

Further it can be provided that the adjusting devices sensors for determining have the adjusting force and / or a calibrated characteristic of the dependence having the actuating force of the input of the adjusting device. It can therefore be provided that the adjusting device at the same time fulfills the function of a force sensor. In a pneumatic or hydraulic actuating cylinder, for example, the force determinable as a quotient of the cylinder pressure and the piston area.

Further it can be provided that the adjusting devices with a control device are connected for measuring and / or adjustment of the actuating force.

Preferably It may be in the cooperating with the adjusting devices Device to act on a rigid plate. But it can too be provided that the plate is twisted under load or elastically deformed in the direction of the actuating force.

The The invention will now be explained in more detail with reference to exemplary embodiments. It demonstrate

1 a joining device according to the invention in a schematic representation;

2 a first embodiment of a support table in plan view;

3 a sectional view of the support table along the section line III-III in 2 with raised stamp;

4 a sectional view of the support table along the section line III-III in 2 with stamped-down stamp;

5 A second embodiment of a support table in plan view.

1 shows a joining device, as a stroke embossing device 1 is designed for hot stamping of films. In the stroke embossing process, the transfer layer of a hot stamping foil is transferred to the substrate through a heated die made of metal or silicone or of metal with a silicone coating in a continuous upward and downward movement. The shape of the stamp determines the shape of the expression. The stroke embossing method is suitable, inter alia, for the crisp and positionally accurate application of individual hologram images on substrates to be decorated, such as packaging or products.

The stroke embossing device 1 has an up and down movable heated die 11 and one with the stamp 11 interacting support table 12 on, between which a substrate to be coated 13 and a hot stamping foil 14 are arranged. A supply roll 15 , a take-up roll 16 and pulleys 17 form a storage and transport device for the hot stamping foil 14 , in which in 1 illustrated embodiment, the means for feeding and positioning the hot stamping foil 14 are not shown in detail. Likewise, the means for feeding and positioning the substrate 13 not shown in detail.

The stroke embossing device 1 has means to the hot stamping foil 14 and the substrate 13 to align with each other, the one on the hot stamping foil 14 arranged decorative element preferably register accurate over a designated area of the substrate 13 is arranged and then, as described below, on the substrate 13 is transmitted. For example, these means may be that on the hot stamping foil 14 per decorative element one or more register marks are arranged, which are detected by a particular optical sensor. The sensor can be in a fixed connection to the Hubpräge device 1 be arranged and detected using the register marks on the hot stamping foil 14 their register-accurate position to the workpiece to be decorated in the stroke embossing device 1 ,

After embossing remains a residual film 14r consisting essentially of the carrier layer of the hot stamping foil drawn off from the transfer layer 14 exists and that on the take-up roll 16 is wound up.

The support table 12 is on adjusting devices 18 supported, for example, as a hydraulic or pneumatic adjusting devices or can be designed as electromechanical actuating devices. The adjusting devices 18 generate when interacting with the die 11 an embossing force, the sum of the restoring forces of the adjusting devices 18 is equal to. The actuating forces of the adjusting devices 18 are separately adjustable so that the embossing force is locally adjustable and surface areas of the decorative element to be imprinted can be acted upon with different embossing force. Different local embossing forces are desired, for example, to compensate for an uneven area occupancy of the decorative element. Compared to the conventional method, the support table 12 Set slightly oblique by adjusting screws or documents to indirectly adjust locally different embossing forces due to the Andruckgeometrie, the device of the invention has the advantage of setting forces or local embossing forces directly. Another advantage is that the control forces are adjustable during operation and from a distance. There is no danger of injury due to manipulation of the hot stamp. Long trial and error is avoided, the set values can be reproduced at any time.

The support table 12 can at different set actuating forces of the individual actuating devices 18 to stand diagonally. attacks 19a limit this inclination to a maximum value, which is approximately 4 mm in the preferred embodiment shown in FIGS.

Regarding a possible inclination of the support table 12 and differently adjusted actuating forces of the individual control devices 18 Different cases can occur.

Is the substrate 13 for example, a flat part, which is on the support table 12 rests and has a surface to be embossed, which is parallel to the surface of the support table 12 runs, it is when embossing the substrate 13 to no inclination of the support table 12 come because different set actuating forces of the individual control devices 18 only to different embossing pressures in the respective surface areas in the vicinity of the adjusting devices 18 to lead. This can be advantageous if the motif to be embossed requires it. For example, individual areas of the motif can have only a small area to be embossed, which requires low embossing pressure and other areas have a large area to be embossed, which requires a higher embossing pressure. In this case, a substrate surface to be embossed, which is parallel to the surface of the support table 12 runs, can be a targeted inclination of the support table 12 not yet as a solid counter bearing resting die 11 be useful to a non-plane parallel edition of the stamping die 11 to achieve, but a piecewise resting or unrolling the stamping die 11 to achieve on the surface to be embossed in order to avoid air bubbles in the surface to be embossed and to reduce the locally required stamping force. For this purpose, the stamp 11 preferably be slightly bent, similar to a stamping punch. Thus, resulting local air pockets can be avoided during the embossing process or pushed out during the emergence and act through the now present lower local embossing area a lower embossing force for the same required embossing pressure on the surface to be embossed. With approaching die 11 For example, two adjusting devices 18 be controlled so that one edge of the support table 12 higher than an opposite edge. In particular, it meets in the downward movement towards the support table 12 located stamp 11 on this higher area of the support table 12 , now become the opposite two embossing cylinder 11 so controlled that now the entire support table 12 is in the upper stop position. In this way, the entire substrate surface to be embossed is embossed with embossing stamps rolling continuously over the substrate surface 11 , Depending on the activation of the embossing stamp 11 and the adjusting devices 18 the speed of unwinding and the entire embossing process can be varied and adjusted accordingly. About the specifically adjustable values at the control devices 18 , which are preferably controlled with proportional valves and a programmable controller (PLC), this embossing process is reproducible at any time. Depending on the part geometry of the substrate 13 are curved, spherical segment-shaped or unevenly shaped dies 11 for the most varied part geometries of the substrate 13 conceivable.

For the described unrolling of the embossing stamp 11 Low inclinations of the support table, which can be in the millimeter range or even in the tenth of a millimeter range. This corresponds to a few degrees deviation from the horizontal.

Is the substrate 13 a part with a three-dimensional surface geometry, which is on the support table 12 rests and has a surface to be embossed, which is not parallel to the surface of the support table 12 runs, it can when embossing the substrate 13 to a desired inclination of the support table 12 come because different set actuating forces of the individual control devices 18 in cooperation with the fixed abutment of the particular according to the surface geometry of the substrates 13 counter-shaped embossing stamp 11 that on the surface of the substrate 13 rests, an inclination of the support table 12 according to the three-dimensional geometry of the substrate 13 can effect. For such balancing of different surface geometries of the substrate 13 by, among other things, tilting the support table 12 are inclinations of the support table in the centimeter or Decimeterbereich in conjunction with according to the dimensions of the substrate 13 sufficiently large support table 12 reasonable and possible. This corresponds to a few degrees to about 10 to 20 degrees deviation from the horizontal.

The 2 to 4 Now show a first embodiment of the support table.

As in 2 are shown under the support table 12 four control devices 18 arranged. The adjusting devices 18 are each in the corner areas of the square support table 12 arranged as in the sectional views in 3 and 4 recognizable by means of the adjusting devices 18 along the side guides 19 is height adjustable. The adjusting devices 18 are formed in a preferred embodiment as a pneumatic adjusting devices with a bellows cylinder, wherein the adjusting devices 18 supplied pneumatic pressure is in the range of 0.1 to 10 bar. The cross-sectional area of the bellows cylinder is chosen so that per bellows cylinder, z. B. a diameter of a bellows cylinder of about 63 mm, a force in the range of 30 to 2000 N is applied. This is the embossing force, ie the sum of the restoring forces of the four actuators 18 , in the range of 120 to 8000 N. The variation of the embossing force in different areas of the support table is about ± 100%.

A further increase in the actuating forces per control device 18 can be achieved by the actuating forces of a control device 18 indirectly via a leverage to the support table 12 attack. In this case, the lever mechanism and the associated adjusting device 18 together below the support table 12 be arranged or the adjusting device 18 and parts of the lever mechanism can next to the support table 12 be arranged.

An increase in the travel of the adjusting device 18 can be achieved by multiple actuators 18 For example, pressure cylinders are arranged one above the other and thereby the lower pressure cylinder moves the overlying pressure cylinder upwards. This happens staggered on each printing cylinder until the attack of the top pressure cylinder on the support table 12 ,

The lateral guides 19 are formed in cross-section L-shaped, wherein the support table 12 facing inside of the vertically arranged one leg of the guide 19 a guideway for the support table 12 forms and the top of the support table 12 facing inside of the other leg the stop 19a forms. The support table 12 is still on a ball joint 12g pivotally supported in two axial directions, wherein the ball joint 12g at the intersection of the through the centers of the cylindrical adjusting devices 18 arranged connecting diagonal is arranged (see 2 ).

The substrate 13 is in the in 3 and 4 illustrated embodiment on a partial recording 12a deposited and fixed on the support table 12 is arranged. The inner contour of the part holder 12a is the outer contour of the substrate to be embossed 13 adjusted so that the substrate 13 without additional means in its position is securely fixed. But it can also be provided, as described above in 1 represented, the substrate 13 be supplied via a transport device, wherein the transport device at the same time the substrate 13 can position and fix. At the substrate 13 it may be, for example, a belt-shaped substrate or on a conveyor belt and discharged consecutively arranged substrates. The substrate may be, for example, paper, cardboard or cardboard or plastic, for. B. ABS, PP, PET or the like. At the substrate 13 it may also be metal, in particular with or without further layers applied thereto (eg paints, adhesion promoters, adhesives).

3 shows that the maximum height adjustment of the support table 12 with upwards moving die 11 through the attacks 19a is limited.

When the die is moved downwards 11 , ie in the working position of the embossing stamp 11 , limits the stamp 11 the maximum height adjustment of the support table 12 , As a result, the support table arrives 12 about the partial recording 12a that matches the surface of the support table 12 parallel substrate 13 and the hot stamping foil 14 to rest on the underside of also with the surface of the support table 12 and with the surface of the substrate disposed thereon 13 parallel embossing stamp 11 when the adjusting devices 18 be operated. The adjusting devices 18 now exert restoring forces, which are directed opposite equally large embossing forces. Consequently, the operation of the adjusting devices 18 in the embodiment shown not to an oblique position of the support table 12 as described above, unless the die 11 has an elastic support, for example, a silicone support.

The 5 shows a second embodiment, the in 2 described embodiment example corresponds, with the difference that instead of four actuators 18 only three adjusting devices 18 are provided, which are arranged in an equilateral triangle. The ball joint 12g is located at the center of the triangle.

In 1 and 5 dashed line is a twist stop 20 recognizable, which is a rotation of the support table 12 prevented and in the area of circumferential guidance 19 is arranged. The tolerance of the rotation stop 20 is set so that touching the outer edges of the support table 12 at the circulating tour 19 is prevented. The rotation stop 20 can only on one side of the device 1 , on two opposite sides or on all sides of the device 1 be provided.

A alternative application of the stroke embossing device according to the invention is the ultrasonic or High frequency welding. In this case, preferably a sonotrode forms a fixed counter bearing the adjustable support table. The substrate, for example one to be welded two-piece plastic part such. B. a car headlight housing with Front and back, is stored in a part holder on the support table. The sonotrode and the part receiving is corresponding to the particular circulating Weld shaped. Depending on part geometry in the area of the weld seam and The shaping of the sonotrode may now be different or equal restoring forces generated with the help of the adjusting devices and carried out the welding process. One Example of pressurization of the individual control devices, in this case pneumatic pressure cylinder, for a given, but not shown in more detail Substrate geometry: Actuator I: 4 bar, actuator II: 3 bar, adjusting device III: 2 bar, adjusting device IV: 1 bar. The pressures used So, in this example, between 1 and about 10 bar, can but depending on the size of the substrate and other boundary conditions of the method are also higher, for example, between 1 and about 1000 bar. It may be advantageous be when the restoring forces the adjusting devices during the welding process are not constant in time, but dynamic, preferably fast dynamic, changed become.

at In a preferred variant, the restoring forces are initially set to one set the middle value. Thereafter, the pressure per actuator by means of proportional valves and a control in particular in increased by about 1 bar at an interval of about 0.1 s and then again reduced to the middle preset value. Through this pulsating forces can the welding process effectively supported and the quality the weld be improved.

1

Hubpräge device

11

dies

12

support table

12a

part seat

12g

ball joint

13

substratum

14

Hot stamping foil

14r

residual foil

15

supply roll

16

up roll

17

idler pulley

18

setting device

19

guide

19a

attack

20

rotation stop

Claims (19)

Joining device ( 1 ), for joining two workpieces with a movable between a lower working position and an upper filling position and stamp ( 11 ), whereby between the stamp ( 11 ) and the support table ( 12 ) a first workpiece ( 14 ) and one under the first workpiece ( 14 ) arranged second workpiece ( 13 ) can be arranged, characterized in that the support table ( 12 ) pivotable about two perpendicular to each other and perpendicular to the axis of movement of the punch ( 11 ) standing pivot axes is mounted and by means of adjusting devices ( 18 ) is pivotable about the two pivot axes, wherein the punch ( 11 ) forms a rigid abutment in the working position, or that the stamp ( 11 ) pivotable about two perpendicular to each other and perpendicular to the axis of movement of the punch ( 11 ) standing pivot axes is mounted and by means of adjusting devices ( 18 ) is pivotable about the two pivot axes, wherein the support table ( 12 ) forms a rigid abutment in the working position. Joining device according to claim 1, characterized in that the first workpiece ( 14 ) is a hot stamping foil, wherein the hot stamping foil has at least one transfer layer and a carrier foil that the second workpiece ( 13 ) is a substrate to be embossed with at least a portion of the transfer layer, and that the stamp ( 11 ) is a heated die. Joining device according to claim 1, characterized in that the punch ( 11 ) is a sonotrode. Joining device according to claim 1, characterized in that the punch ( 11 ) is a high frequency welding head. Joining device according to one of the preceding claims, characterized in that four actuating devices ( 18 ) are provided, which are arranged in a preferably rectangular quadrangle, wherein an about two mutually perpendicular axes pivotable joint ( 12g ) is disposed in a region having the intersection of the diagonals of the quadrilateral. Joining device according to one of claims 1 to 3, characterized in that three adjusting devices ( 18 ) are provided, which are arranged in a preferably isosceles triangle, wherein the about two mutually perpendicular axes pivotable joint ( 12g ) is disposed in an area having the center of the triangle. Joining device according to one of the preceding claims, characterized in that the adjusting devices ( 18 ) are designed as pneumatic or hydraulic actuating devices. Joining device according to claim 7, characterized in that the adjusting device ( 18 ) is a bellows cylinder. Joining device according to one of claims 1 to 6, characterized in that the adjusting devices ( 18 ) are designed as electromechanical actuating devices. Joining device according to one of the preceding claims, characterized in that the with the adjusting devices ( 18 ) cooperating device has a rotation. Joining device according to one of the preceding claims, characterized in that the with the adjusting devices ( 18 ) cooperating device a stop for limiting the travel of the adjusting devices ( 18 ) having. joining device according to claim 11, characterized in that the stop as adjustable stop is formed. Joining device according to one of the preceding claims, characterized in that the device forming the rigid abutment is pivotable about two perpendicular to each other and perpendicular to the axis of movement of the embossing punch ( 11 ) standing pivot axes is adjustable. joining device according to claim 13, characterized in that the rigid abutment forming device by means of screws pivotally adjustable is. joining device according to claim 13, characterized in that the rigid abutment forming device is pivotally adjustable by means of documents. Joining device according to one of the preceding claims, characterized in that on the support table ( 12 ) a receptacle for the substrate ( 13 ) is arranged. Joining device according to claim 2, characterized in that the device is a storage and transport device for the hot stamping foil ( 14 ) having. Joining device according to one of the preceding claims, characterized in that the adjusting devices ( 18 ) Have sensors for determining the actuating force and / or have a calibrated characteristic of the dependence of the actuating force of the input variable of the actuating device. Joining device according to one of the preceding claims, characterized in that the adjusting devices ( 18 ) are connected to a control device for measuring and / or adjusting the actuating force.