EP3914404A1

EP3914404A1 - Device for stamping and punching through a sheet-like workpiece

Info

Publication number: EP3914404A1
Application number: EP20700347.6A
Authority: EP
Inventors: Eberhard Dietzel
Original assignee: Tox Pressotechnik GmbH and Co KG
Current assignee: Tox Pressotechnik GmbH and Co KG
Priority date: 2019-01-23
Filing date: 2020-01-08
Publication date: 2021-12-01
Also published as: WO2020151943A1; DE102019101596A1; CN113329828B; CN113329828A; US20210346936A1

Abstract

A device for stamping a depression (2) into a sheet-like workpiece and for punching through the workpiece in the region of the stamped depression (2) is proposed, comprising a punch unit and a die unit, between which the workpiece can be positioned, wherein the punch unit has a punch with a forming punch (8) and a stamping punch (9), wherein the forming punch (8) is designed to come into contact with a side of the workpiece in the region of the depression (2) during the stamping of the depression (2) and wherein the stamping punch (9) is designed to punch through the workpiece in the region of the depression (2), wherein the forming punch (8) and the stamping punch (9) are movable in a driven manner along a joining axis of the device. According to the invention, the forming punch (8) and the stamping punch (9) are enclosed in a punch housing, wherein the forming punch (8) and the stamping punch (9) can be driven in relation to the punch housing along the joining axis of the device by means of a common hydraulic supply.

Description

"Device for embossing and punching a plate-like workpiece"

State of the art

Tools for embossing a depression in a plate material and for punching the depression in one operation are known. Such tools have, for example

drivable stamp unit and one of the stamp unit

opposite die unit between which the

Workpiece can be positioned for machining.

The embossing and punching requires, on the one hand, a control of the complex work process and a corresponding mechanical system including a controllable suitable drive arrangement.

Object and advantages of the invention

The object of the present invention is to provide a device for embossing and punching workpieces, which is described at the outset and with which work processes can be implemented reliably and which is advantageously designed with regard to the drive situation.

This task is solved by the independent claims.

The dependent claims address advantageous and

expedient developments of the invention.

The invention is based on a device, for example a tool, for embossing a depression in a plate-like one Workpiece and for punching through the workpiece in the area of the embossed depression, comprising a stamp unit and a die unit opposite the stamp unit, the one with the die unit between the stamp unit and the die unit

Workpiece that can be processed by the device can be positioned, the stamping unit having a stamp with a shaped stamp and with a stamping stamp, the shaped stamp being designed to come into contact with the recess on a workpiece side in the region of the recess and the stamping stamp being designed to shape the workpiece to punch through in the area of the recess, the shaped punch and the punch being movable along a joining axis of the device. The workpiece is, for example, a sheet metal material. The punching is preferably carried out in a material area of the workpiece which passes through a preferably flat bottom of the depression

is formed. Punching through the material or

The bottom of the depression takes place from the side of the depression or the bottom on which the shaping stamp comes into contact with the depression or the bottom.

The essence of the invention is that the shaped stamp and the punch are accommodated in a stamp housing, the shaped stamp and the punch having a common one

Hydraulic supply relative to the stamp housing along the

Joining axis of the device can be driven. The

Hydraulic supply is preferably part of the device according to the invention. The invention is advantageous with regard to a reduced complexity of the drive situation, in particular for the part of the stamp drive which controls the movement of the

Form stamp and the punch relative to the stamp housing relates.

In addition, a drive for a movement of the stamp housing, which is preferably additionally on the

Stamp unit is present and / or works independently of the drive by means of the hydraulic supply, can be realized independently of the hydraulic drive of the form and punch.

The hydraulic supply, for example with a hydraulic Pressure generation outside the stamp housing, is preferably connected to one or preferably two or more

Hydraulic rooms that are hydraulically separated from each other in the stamp housing.

The hydraulic supply is preferably designed in such a way that the shaping stamp and the punching stamp can be driven independently of one another or only individually or jointly with the hydraulic supply or at the same time or at different times or

can be driven one after the other. For example, the die and the die move in a common drive phase

Stamp · in the same or in the opposite

Direction of movement. The hydraulic supply is preferably used for moving in z. B. a joining direction and for moving against the joining direction of the die and / or the

Stamping stamp.

Advantageously, the hydraulic supply not only enables an active, driven movement of the shaping stamp and / or the punching stamp, it is rather the case with the

Hydraulic supply can be set up so that the hydraulic supply exerts a predeterminable counter-force on the form stamp and / or the stamping stamp, which acts counter to a direction of movement of the stamp concerned if the movement does not originate from the hydraulic supply, for example the movement is forced from the outside or not on the hydraulic side . The counterforce is provided in particular by a hydraulic fluid which is accommodated in a hydraulic chamber of the stamp housing and is present on the forming stamp and / or the stamping stamp. Overall, a high level of process complexity and / or high level of process reliability can be achieved, and in particular short-term uncontrolled states can also be achieved during the

Avoid process.

This is the case, for example, with a retraction of the form and / or punch, if, for. B. the stamp housing is moved against or in the direction of the die unit. The punch is displaceable relative to the form stamp.

Preferably, at least one front or die-side end section of the punch is received within a section of the die or surrounded on the outside or

along a corresponding wall of a recess in the

Form stamp led. The shaped stamp recess is at least open on the die side, so that depending on the drive or

Process situation different relative positions of punch and form stamp are possible, for. B. a front

End section of the punch on the die side on the

protrudes on the die side of the die or a die side of the die is sunk towards the face of the die. In the non-punching state, the end face of the punch on the die side is preferably flush with the end face of the forming die or slightly recessed.

The punch stamp has on the die side z. B. on one

Base body face of a base body of the punch, such as a punching piston, for example exactly one for

Base body end protruding and punching through the workpiece elongated punching section with an end face. The stamping section is preferably interchangeable on

Punching piston added. As an alternative, the stamping punch has two or more separate stamping sections with separate end faces which protrude toward the end face of the base body. The multiple punching sections can be identical to one another or

be designed differently. Accordingly, with exactly one punching section there is exactly one hole or there are several

Punching sections in one stroke two or more than two identical or different holes in the recessed area of the

Stamped workpiece. The punched sections are preferably separate z. B. interchangeable components, which are fixed in the base body or in the punching piston of the punch

are included. A base body side, for example a forward stroke side and / or a return stroke side of the punch, preferably adjoins an associated hydraulic chamber in the

Stamp housing on, the hydraulic chamber with one of the Hydraulic supply provided hydraulic pressure is applied.

The hydraulic supply preferably comprises at least one

Hydraulic fluid space or z. B. a reservoir in which hydraulic fluid is housed. Of the

Hydraulic fluid space is preferably in a

Stamp unit and die unit housed separate or separate unit, preferably with a housing within which the hydraulic fluid space or

Reservoir is housed. In the housing z. B. a piston such as a booster piston of a hydropneumatic

Pressure translator slidably housed on the

Hydraulic fluid works.

The hydraulic fluid chamber is hydraulic with exactly one hydraulic chamber of the stamp unit or with several

Hydraulic fluid spaces connected. The hydraulic

Connection is preferably z. B. via a

Hydraulic connection or hydraulic line. The hydraulic connection is preferably designed as a flexible hose connection or as a rigid connection, with a rigid line or with a rigid component with a housing, within which the line is present. The rigid component is preferably connected to or connected to the stamp housing and a housing of the hydraulic supply

intended.

A forward stroke side of a piston is a side on which a hydraulic chamber acts, whereby by increasing the pressure in the

Hydraulic chamber of the piston is movable in a pre-stroke direction, or along the joining axis in a direction towards the die unit. This presupposes that there is a path of movement for the piston in this direction, e.g. B. the piston does not abut a stop in this direction.

Conversely, a return stroke side of a piston is a side on which a hydraulic chamber acts, whereby by increasing the pressure in the Hydraulic chamber of the piston is movable in a return stroke direction, or along the joining axis in a direction away from the

Die unit. The forward stroke side on a piston includes a portion on the piston opposite a portion associated with a return stroke side of the piston, e.g. B.

opposite sections of a piston, which are aligned transversely to a longitudinal axis of the piston.

One advantage results from the fact that the stamp unit has a first hydraulic chamber and a second hydraulic chamber, which are hydraulically separated from one another within the stamp housing. This allows a forward stroke side and / or a return stroke side of the form and / or the punch to be subjected to hydraulic pressure. Therefore, either a position of the die and / or the punch can be fixed, in particular unchangeably held, or a movement of the die and / or punch in a desired direction along the joining axis can be specified. A

Hydraulic space can be on a pre-stroke side or on a

Return stroke side of the form punch or the punch punch act or adjoin it. A second hydraulic chamber in the stamp housing, for example, can preferably act, for example, both on a forward stroke side of the forming stamp and on a return stroke side of the stamping stamp. The first hydraulic chamber in the stamp housing preferably acts on a forward stroke side of the stamping stamp without acting on the shaping stamp. Between the first hydraulic chamber and the second hydraulic chamber there is preferably a hydraulic seal, in particular between the punching piston and one

Inner wall of the stamp housing is formed. The seal can, for example, be present on the outer circumference of the moving punching piston. The first hydraulic chamber and the second hydraulic chamber are thus secure within the stamp housing

hydraulically separated. The first hydraulic space and / or the second hydraulic space are preferred

Resizable through the movement of the die and / or the punch.

It is also advantageous if the first hydraulic space over a first hydraulic connection is connected to the hydraulic supply. A desired pressure level can thus be specified separately or in a controllable manner in the first hydraulic chamber. The first hydraulic connection, such as a hydraulic line, is particularly suitable for having hydraulic fluid in both

Flow directions flows through the first hydraulic connection. So hydraulic fluid can enter the first hydraulic room

flow, which increases the volume of the first hydraulic space, or hydraulic fluid from the first

Drain or flow out hydraulic space, under

Volume reduction of the first hydraulic room. The first hydraulic connection preferably connects the first hydraulic chamber to a hydraulic high-pressure chamber of the hydraulic supply.

According to an advantageous variant of the invention, the second hydraulic chamber of the stamp unit is via a second one

Hydraulic connection connected to the hydraulic supply.

The second hydraulic connection preferably connects

only the second hydraulic room with a hydraulic high pressure room of the hydraulic supply.

The first and / or second hydraulic connection is, for example, a rigid pipeline or a flexible hose line, which are designed for high-pressure hydraulic operation.

Another advantage arises if the first hydraulic chamber and the second hydraulic chamber have a high-pressure chamber

Hydraulic supply are connected. The first and the second hydraulic chamber are preferably connected to a common high-pressure chamber of the hydraulic supply. The high pressure room of the

Hydraulic supply is preferably a high-pressure room in which a hydraulic high pressure of z. B. there are several hundred bar. In the high-pressure chamber, the hydraulic pressure can be changed, in particular reversibly reduced and increased.

For example, the hydraulic pressure in the high-pressure chamber can be brought to a medium or low pressure level which is below the high-pressure pressure level. Accordingly, the high pressure space is a hydraulic space in which, for example, by a higher-level control unit such as Legs

Control unit there is a comparatively high pressure, z. B. sometimes a comparatively low pressure or

There is low pressure, depending on the operating state.

It is particularly advantageous if the first hydraulic chamber of the stamp unit is only on a forward stroke side of the

Die stamp works. With a pressure increase in the first hydraulic chamber, the punch can thus move into a first one

Movement direction or in a pre-stroke direction. With constant high pressure in the first hydraulic chamber, if no even higher pressure acts on the punch, the can

Stamping position fixed or in its position or

Pre-stroke position are held.

The forward stroke side of the punch is preferably an axially aligned side of the punch, for example one

Face of the punch, which faces away from the die unit. For example, the relevant end face of the

Stamping stamp delimiting the first hydraulic space

Wall section that is movable.

The others are preferably the first hydraulic chamber

bounding wall sections fixed sections of the stamp unit such as the stamp housing. The further wall sections delimiting the first hydraulic space preferably do not include any

Section of the die.

According to a further advantage of the invention, the second hydraulic chamber of the stamp unit acts on the return stroke side of the

Stamping stamp and on the pre-stroke side of the forming stamp. Accordingly, the second hydraulic chamber acts on a section of the

Stamping stamp and on a section of the form stamp. The sections of the stamping die and the shaping stamp are preferably located axially to the axis of movement of the stamp or to

Joining axis opposite, in between is the second hydraulic room.

The second hydraulic chamber of the stamping unit is preferably circumferential as a ring volume around a partial length of the stamping stamp educated .

It is further proposed that the first hydraulic connection comprises a valve arrangement for opening and / or closing the first hydraulic connection. In this way, a

Influences pressure level in the first hydraulic chamber of the punch unit and thus a state of movement of the punch or

be specified. This makes it possible, in particular, to be controlled or predefined via the one which communicates with the valve arrangement

Control unit a flow of hydraulic fluid through the first hydraulic connection enabled or blocked. The valve arrangement preferably comprises a valve such as e.g. B. a switchable solenoid valve.

With regard to a simple arrangement, it is advantageous that the second hydraulic connection cannot be shut off.

The second hydraulic connection has in particular no valve for opening and / or closing the second hydraulic connection, but in the simplest case can be, for example, a hydraulic line alone without further line elements.

It is alternatively possible that the second hydraulic connection z. B. can be shut off and released with a valve arrangement.

According to an advantageous option of the invention, the first hydraulic chamber is connected to a low-pressure chamber of the hydraulic supply. So that the punch is hydraulic z. B. brought into a basic position. The punch is retracted against the low pressure in the first hydraulic chamber. High pressure is then present in the second hydraulic chamber. The

Connection of the first hydraulic chamber to a low-pressure chamber is preferably an additional connection for connecting the first hydraulic chamber to the high-pressure chamber

Hydraulic supply can be set up. For example, the first hydraulic chamber can be connected to the high-pressure chamber or the low-pressure chamber via a corresponding circuit of the valve arrangement.

In addition, there is an advantage in that the first Hydraulic connection via an intermediate connection with a

Low pressure chamber of the hydraulic supply is connected.

The first hydraulic connection preferably has one

Branch the intermediate connection with z. B. one

Branch line on, which is connected to the low pressure chamber.

The intermediate connection preferably has a valve for releasing and shutting off the intermediate connection.

The valve arrangement preferably comprises at least three,

preferably exactly three valves. A first valve of the first hydraulic connection is between the branch point and the

first hydraulic room available. A second valve of the first hydraulic connection is between the branch point and the

High pressure room available. A third valve is in the

Intermediate connection or in the branch line available or

between the low pressure chamber and the first hydraulic connection.

As a result, all practice-relevant states can be switched by switching the three accordingly

Set up valves in one of two possible states.

Accordingly, the valve arrangement is designed to open and / or close a connecting section between the high-pressure chamber and the intermediate connection. The connecting section is formed in particular by a partial length of the first hydraulic connection and the intermediate connection. The valve arrangement preferably comprises a valve for opening and / or closing the

Intermediate connection or the connecting section between the high pressure space and the intermediate connection.

When the valve, which is present between the high-pressure chamber and the connecting section, is closed, the low-pressure chamber can be hydraulically connected to the first hydraulic chamber if further valves in this connection are open.

A preferred embodiment of the invention is that the hydraulic supply is a hydropneumatic

Pressure intensifier device comprises. The hydropneumatic

Pressure intensifier device is advantageous because a proven standard unit that is available in different design variants ready or ready for use.

An existing in a pressure intensifier housing and with

Hydraulic fluid-filled hydraulic fluid space of the hydropneumatic pressure booster device is connected to the first hydraulic space and / or is connected to the second hydraulic space of the device. The hydropneumatic

Pressure intensifier device preferably includes the

Low pressure room as well as the high pressure room of the

Hydraulic supply.

Alternatively, another hydraulic supply is also possible, for example with a hydraulic pump as the central unit of the

Hydraulic supply. With the hydraulic pump, the

Hydraulic fluid is promoted or becomes a hydraulic

High pressure and / or a hydraulic low pressure

Hydraulic supply provided.

Finally, it is advantageous if a drive is provided, the drive being designed to drive the stamping unit in such a way that the shaped stamp and the stamping stamp together relative to the die unit along the joining axis of the

Device or can be driven relative to the die unit.

The drive includes, for example, a drive unit. Of the

The drive or the drive unit is preferably provided on the stamp side or is part of the stamp unit. An electric drive with an electric motor is preferably provided for this. The stamp housing can be driven with the drive unit relative to other components of a corresponding tool. The tool includes, for example, so-called tool pliers or a so-called C-bracket.

The drive is preferably a linear drive, for example an electric linear drive. With the linear drive z. B. with the stamp housing of an electric motor is reversible or can be driven back and forth along the joining axis.

Figure description

Further features and advantages of the invention are based on an embodiment shown in the figures

Device according to the invention described in more detail. In detail shows:

Fig. 1 is a highly schematic diagram of a

Device according to the invention using a

Sectional view of the device and

Fig. 2 shows a section of a schematic

to Fig. 5 device according to the invention in each

Longitudinal section in different

Operating states, the section plane according to FIG. 5 being perpendicular to the section plane according to FIGS. 2 to 4.

In Figures 1-5 is a section of each

Device 1 according to the invention for embossing a depression 2 (see FIGS. 4, 5) into a plate-like workpiece 3 and for

Punch through the workpiece 3 in the area of the embossed

Well 2 shown. The device 1 is designed as an embossing-punching pliers 4, hereinafter referred to as pliers 4.

In Fig. 1, the pliers 4 is shown purely schematically, with a stamp unit 5 and with a die unit 6 opposite the stamp unit 5 along a joining axis F, the work piece 3 that can be machined with the pliers 4 being flat between the stamp unit 5 and the die unit 6 flat initial shape is held, ie before an embossing and Punching. The workpiece 3 is, for example, a sheet metal workpiece and consists, for. B. from a few millimeter thick metal material.

The stamp unit 5 comprises a stamp 7 with a

Form stamp · 8 and a punch stamp 9. The stamp 8 comes when embossing the recess 2 on a workpiece side 3a in

Area of deepening 2 in annex. The stamp 9

After the embossing process, an elongated punch section 11 projecting from a base body 10 of the punch 9 and comprising two punch pins 12, 13 punched through the workpiece 3 in the region of the depression 2.

The form stamp 8 and the punch 9 are in one

Stamp housing 14 included, which with a drive unit such as an electric drive 15 (see FIG. 2) linearly in a

Direction RI and driven in a direction R2, relative to the die unit 6. With the electric drive 15, the stamp unit 5 is driven such that the

Form stamp 8 and the stamp 9 together with the

Stamp housing 14 relative to the die unit 6 along the

Joining axis F can be driven.

Accordingly, the punch 7 or the shaping punch 8 and the punch 9 can be moved together linearly driven in the direction RI or towards along the joining axis F of the pliers 4

Matrix unit 6 and back in the direction R2, which the

Opposite direction RI.

To operate the pliers 4, a higher-level programmable control unit, not shown, is available, for example with a computer unit.

According to the invention, the die 8 and the punch 9 are relative to one another via a common hydraulic supply 16

Stamp housing 14 can be driven along the joining axis F of the pliers 4.

The stamp unit 5 preferably has within the

Stamp housing 14 a first hydraulic chamber 17 and one second hydraulic chamber 18. The hydraulic spaces 17 and 18 filled with a hydraulic fluid, such as a hydraulic oil, for example, are within the plunger housing 14

hydraulically separated, by the stamp housing 14 and

Example by closed around the joining axis F.

Ring seals 19 on the outside on the base body 10. Die

Ring seals 19 seal against an inside 14a of the

Stamp housing 14.

The first hydraulic chamber 17 is above a first one

Hydraulic connection 20 connected to the hydraulic supply 16.

The second hydraulic chamber 18 is via a second one

Hydraulic connection 21 connected to the hydraulic supply 16.

The first hydraulic chamber 17 and the second hydraulic chamber 18 are connected to a high-pressure chamber 22 of the hydraulic supply 16. The high-pressure chamber 22 is also filled with the hydraulic fluid.

The first hydraulic chamber 17 acts on the punch 7 only in relation to a forward stroke side 9a of the punch 9 or the base body 10.

The second hydraulic chamber 18 acts on a return stroke side 9b of the punch 9 and on a forward stroke side 8a of the die 8.

The first hydraulic connection 20, for example one

Hydraulic line such as a hydraulic hose line has a valve arrangement 23, preferably with a valve 24 and a valve 25, for opening and / or closing the first

Hydraulic connection 20.

The second hydraulic line 21, for example a hydraulic hose line, cannot be shut off or

has no valve arrangement. The second hydraulic chamber 18 is always hydraulically connected to the high-pressure chamber 22

Hydraulic supply 16. The hydraulic supply 16 comprises a hydropneumatic one

Pressure intensifier device 26 with a housing 27, to which indicated pneumatic lines 28, 29 and 30 connect.

The high-pressure chamber 22 and a low-pressure chamber 31 are present within the housing 27 of the pressure booster device 26. The mode of operation of the pressure booster device 26 is explained further below.

The first hydraulic chamber 17 can optionally be hydraulically conductively connected to the high-pressure chamber 22 and / or to the low-pressure chamber 31 of the hydraulic supply 16.

For this purpose, an intermediate connection 32 connects to the first hydraulic connection 20 for a connection to the

Low pressure chamber 31. The intermediate connection 32 is connected at one end to the low pressure chamber 31 and at the other end to the hydraulic connection 20. The

Intermediate connection 32 has a valve 33 for opening

and / or shutting off the interconnect 32.

The valve arrangement 23 comprises the valve 25 for opening and / or closing a connecting section 20a between the

High pressure space 22 and the intermediate connection 32 or one

Connection of the intermediate connection 32 to the hydraulic connection 20. The connection section 20a is part of the

Hydraulic connection 20 between the connection of the

Intermediate connection 32 and an opening in the housing 27 hydraulically connected to the high pressure chamber 22.

Inside the housing 27 of the hydropneumatic

Pressure intensifier device 26 are a pressure intensifier piston 34 and a storage piston 35 in the direction R3 and back in

Movable linearly towards R4. The pressure booster piston 34 has a larger-diameter piston section 34a and a centrically elongated and rigidly connected to it

Piston section 34a smaller diameter piston rod 36. For displaceable movement of the pressure booster piston 34 in the direction R3, a pneumatic chamber 37 of the pressure booster device 26 enclosed by the housing 27 is acted upon by compressed air via the pneumatic line 28.

For the displaceable movement of the pressure booster piston 34 in the direction R4, one is enclosed by the housing 27

Pneumatic chamber 38 on the rear stroke side of the pressure booster device 26 is supplied with compressed air via the pneumatic line 29.

For the displaceable movement of the accumulator piston 35 in the direction R3, a forward stroke side enclosed by the housing 27 becomes

Pneumatic chamber 39 of the pressure booster device 26 pressurized with compressed air via the pneumatic line 30. The return stroke of the accumulator piston 35 in the direction R4 is carried out by hydraulic fluid flowing into the low-pressure chamber 31 filled with hydraulic fluid.

A comparatively high hydraulic pressure in the high-pressure chamber 22 arises when the pressure booster piston 34 moves in the direction R3 and dips with its front or free end of the piston rod 36 into a constriction 40, which has a circumferential seal 41. When the piston rod 36 plunges into the constriction 40, the wall of the constriction 40 and an outside of the piston rod 36 are hydraulically sealed from one another by means of the seal 41, so that the high-pressure chamber 22 and the low-pressure chamber 31 are hydraulically separated at the constriction 40.

The die unit 6 has a stamp-side end face 6a for one-sided support for the workpiece 3. A die hold-down device or die ring 43, which is linearly movable via a spring 44 along the joining axis F, is received around a central, positionally stable die body 42. In a

The basic position of the device 1 according to FIG. 2 is a plane flat support by the effective to the stamp unit 5

Flushness of die body 42 and die ring 43 given.

The operation of the pliers 4 according to the invention is explained below with reference to FIGS. 2 to 5, in which the pliers 4 according to FIG. 1 are shown in more concrete terms, only a section of the pliers 4 being shown, comprising parts of the

Stamp unit 5 and the die unit 6.

2 shows the basic position of the device 1, in which the pliers 4 are opened or the stamp unit 5 has moved back in the direction R2, which is done with the electric drive 15. Relative to an end face 5a of the stamp unit 5, the shaped stamp 8 is located in a direction RI

extended position, the punch 9 being recessed or retracted or retracted in the direction of the R2. There is no workpiece between the stamp unit 5 and the die unit 6.

According to FIG. 3, which corresponds to the state according to FIG. 1, the pliers 4 are closed with the drive 15, the workpiece 3 being fixed between the stamp unit 5 and the die unit 6 or with a flat side on the end face 6a of the die unit 6 abuts and is in contact with the other surface side on the face 5a on the die 8 on the face. The form stamp 8 is with hydraulic pressure, which from the pressure intensifier device 26 via the second

Hydraulic connection 21 is provided, extended in the direction of R1. The hydraulic pressure in the second hydraulic chamber 18 accordingly acts on the pre-stroke side on the die 8 and

on the stroke side on the punch 9. The punch 9 is therefore withdrawn in the direction of R2 and stands with its

Punching section 11 or with the two retracted punching pins 12, 13 does not have an end face of the forming die 8 which is opposite the end face 6a of the die unit 6.

The booster piston 34 of the pressure booster device 26 is actuated pneumatically on the forward stroke side and in a so-called Power stroke extended towards R3. The piston rod 36 is immersed in the constriction 40. Hydraulic high pressure is generated in the high pressure chamber 22, displaced

Hydraulic fluid from the high pressure chamber 22 via the

open or switched valves 25 and 33 or the connecting section 20a and the intermediate connection 32 is pumped into the low-pressure space 31, which additionally functions as a storage space. The valve 24 is closed or shuts off the first hydraulic connection 20 to the hydraulic chamber 17.

In the next step, the shape is embossed (see FIG. 4) or the recess 2 is formed by means of the drive 15. All three valves 24, 25 and 33 are closed. Depending on the

the path of movement of the stamp unit 5 in the direction RI, a predeterminable shape depth t of the recess 2 is formed in the workpiece 3, based on the undeformed regions of the

Workpiece 3. The mold depth t is, for example, up to 8

Millimeter. With the movement of the stamp unit 5

Stamp housing 14 move in the direction of RI, the

Shaped punch 8 withdraws relative to the punch housing 14 in the direction R2, the die hold-down device or die ring 43 simultaneously withdrawing in the direction of RI. The for

The end face of the die 8 which shows the die unit 6 is in contact with the bottom of the depression 2. The die 8 is pushed back against the hydraulic pressure in the hydraulic chamber 18 in the direction R2. As a result, due to the closed valves 24, 25 and 33, hydraulic fluid is displaced from the shrinking hydraulic chamber 18 via the hydraulic connection 21 into the high-pressure chamber 22 when the plunger 8 is pushed back. According to the repressed

The hydraulic fluid quantity of the booster piston 34 or the piston rod 36 is shifted back somewhat in the direction R4, against the force stroke pressure in the high-pressure chamber 22. The hydraulic shaping force prevailing in the high-pressure chamber 22 remains constant.

5, when the electric drive 15 is at a standstill, the punching process, which is determined hydraulically or by the hydraulic supply 16, takes place. The form stamp 8 is still below High pressure on the workpiece 3 or the recess 2. The punch 9 with its two punch pins 12, 13 is hydraulically until it stops at a stop 45 on

Form punch 8 extended. The pressure booster piston 34 is briefly reset somewhat in the direction R4, so that there is sufficient volume of hydraulic fluid in the high-pressure chamber 22 in front of the piston rod 36. The pressure intensifier piston 34 is then extended again in the direction R3, with the result that a power stroke takes place with the high pressure in the high pressure chamber 22. The valves 24 and 25 are open and the valve 33 is closed. As a result, high-pressure hydraulic fluid is displaced from the high-pressure chamber 22 via the hydraulic connection 20 into the hydraulic chamber 17 and the punch 9 extends in the direction of R1. After punching the workpiece 3 in the region of the recess 2 by the punch pins 12 and 13, whereby two holes are created in the workpiece according to the size or shape of the end face of the respective punch pins 12, 13, the machining of the workpiece 3 is completed. The pliers 4 are then returned to the basic position shown in FIG. 2.

The pliers 4 open with the drive 15, the stamp unit 5 moving in the direction R2. In addition, the die 8 extends hydraulically in the direction of R1 to a stop 46 on

Stamp housing 14 (see Fig. 2). Then the

Punching piston 9 hydraulically back in the R2 direction

Initial position. Hydraulic high pressure is used in the

Hydraulic chamber 18 is set up, which acts on the forward stroke side on the punch 8 and on the return stroke side on the punching piston 9. For this are the

Valves 24 and 33 open. The valve 25 is closed and blocks the flow to the high pressure chamber 22 and allows the hydraulic fluid to flow back into the low pressure chamber 31. Reference list

1 device

2 deepening

3 workpiece

3a workpiece side

4 embossing punch pliers

5 stamp unit

5a end face

6 die unit

6a end face

7 stamps

8 stamps

8a pre-stroke side

9 stamps

9a pre-stroke side

9b return stroke side

10 basic bodies

11 stamping section

12 punch pin

13 punch

14 stamp housing

14a inside

15 drive

16 Hydraulic supply

17 hydraulic chamber

18 hydraulic room

19 ring seal

20 hydraulic connection

20a connecting section

21 hydraulic connection

22 high pressure room

23 valve arrangement

24 valve

25 valve

26 pressure intensifier device

27 housing

28 line 29 line

30 line

31 low pressure room

32 Intermediate connection 33 valve

34 pressure booster piston 34a piston section

35 accumulator pistons

36 piston rod

37 Pneumatic room

38 pneumatic room

39 Pneumatic room

40 constriction

41 seal

42 die body

43 die ring

44 spring

45 stop

46 stop

Claims

Expectations :

1. Device (1) for embossing a depression (2) into a plate-like workpiece (3) and for punching through the workpiece (3) in the region of the embossed depression (2), comprising a

Stamp unit (5) and one of the stamp unit (5)

opposite die unit (6), wherein between the

Stamp unit (5) and the die unit (6) with the

Workable workpiece (3) can be positioned in the device (1), the stamp unit (5) having a stamp (7) with a

Form stamp (8) and with a punch (9), wherein the stamp (8) is formed when embossing the recess (2) on a workpiece side in the region of the recess (2) in

To come and the punch (9) is designed to punch the workpiece (3) in the region of the recess (2), the punch (8) and the punch (9) being driven to move along a joining axis of the device (1) are characterized in that the shaped stamp (8) and the punch (9) are accommodated in a stamp housing (14), the

Form stamps (8) and the stamping stamp (9) can be driven via a common hydraulic supply (16) relative to the stamp housing (14) along the joining axis of the device (1).

2. Device according to claim 1, characterized in that the stamp unit (5) has a first hydraulic chamber (17) and a second hydraulic chamber (18) which within the

Stamp housing (14) are hydraulically separated from each other.

3. Device according to claim 1 or 2, characterized in that the first hydraulic chamber (17) via a first

Hydraulic connection (20) with the hydraulic supply (16)

connected is.

4. Device according to one of the preceding claims, characterized in that the second hydraulic chamber (18)

Stamp unit (5) is connected to the hydraulic supply (16) via a second hydraulic connection (21).

5. Device according to one of the preceding claims, characterized in that the first hydraulic chamber (17) and the second hydraulic chamber (18) with a high pressure chamber (22)

Hydraulic supply (16) are connected.

6. Device according to one of the preceding claims, characterized in that the first hydraulic chamber (17)

Stamp unit (5) only on a pre-stroke side of the

Stamp (9) acts.

7. Device according to one of the preceding claims, characterized in that the second hydraulic chamber (18) of the

Stamp unit (5) acts on a return stroke side of the stamping stamp (9) and on a forward stroke side of the forming stamp (8).

8. Device according to one of the preceding claims, characterized in that the first hydraulic connection (20) comprises a valve arrangement (23) for opening and / or closing the first hydraulic connection (20).

9. Device according to one of the preceding claims, characterized in that the second hydraulic connection (21) is not lockable.

10. Device according to one of the preceding claims, characterized in that the first hydraulic chamber (17) with a low pressure chamber (31) of the hydraulic supply (16) is connected.

11. Device according to one of the preceding claims, characterized in that the first hydraulic connection (20) is connected via an intermediate connection (32) to a low-pressure chamber (31) of the hydraulic supply (16).

12. Device according to one of the preceding claims, characterized in that the valve arrangement (23) for opening

and / or closing a connecting section between the

High-pressure space (22) and the intermediate connection (32) is formed.

13. Device according to one of the preceding claims, characterized in that the hydraulic supply (16) a

hydropneumatic pressure intensifier device (26).

14. Device according to one of the preceding claims, characterized in that a drive (15) is provided, the drive (15) being designed to drive the stamp unit (5) such that the shaped stamp (8) and the stamping stamp (9 ) can be driven together relative to the die unit (6) along the joining axis of the device (1).