DE102020112901A1 - Tool and tool holder - Google Patents

Abstract

A tool (2) with a tool unit (3) is proposed which has a punch side (4) with a punch and a die side (6) with a die (7), the die (7) being present opposite a free end of the punch so that a workpiece for machining with the tool unit (3) can be positioned between the punch side (4) and the die side (6), the tool (2) comprising a fluid line in which an operating fluid is attached to a section of the tool unit ( 3) can be supplied in order to wet the section with the operating fluid, and wherein the tool (2) comprises a gas flow line (11, 19) for feeding a gas flow to the tool unit (3). According to the invention, the liquid line is arranged within the gas flow line (11, 19).

Description

State of the art

Tools or tool brackets with a tool for processing workpieces such as sheet metal relate to tools, for example, for forming, clinching, clinching and / or for setting a functional or joining element. Such known tools include in particular a tool unit comprising a punch side and an opposite die side with which the actual tool work is carried out. The tools are regularly received on a so-called C-bracket, in particular on opposite free ends of legs of the C-bracket.

The punch side has a punch that is usually surrounded by a hold-down device, the die side with a die being present opposite a free end of the punch. For processing with the tool unit, a workpiece is positioned or clamped between the punch with the hold-down device and the die.

An operating fluid, such as a lubricating fluid, is often required for using tools or for machining the workpiece. For this purpose, for example, a liquid line is used to bring in and wet a section of the tool unit with the operating liquid.

The provision of the operating fluid poses a challenge in terms of a compact or slim design of the tool unit and / or an optimized metering of the operating fluid. B. for functional testing during tool use, which brings further problems.

Object and advantages of the invention

The object of the present invention is to improve a tool of the type explained at the outset, in particular with regard to an optimized provision of an operating fluid such as a lubricating fluid on the tool unit. In particular, it should advantageously be possible to provide the operating fluid on the tool with regard to a functional check of the tool while the tool is in use.

This problem is solved by the independent claims.

The dependent claims show advantageous and expedient developments of the invention.

The invention is based on a tool with a tool unit which has a punch side with a punch and a die side with a die, the die being present opposite a free end of the punch, so that a workpiece for machining with the tool unit between the punch side and the die side can be positioned, the tool comprising a liquid line in which an operating liquid can be fed to a section of the tool unit in order to wet the section with the operating liquid, and wherein the tool has a gas flow line for introducing a gas flow, preferably an air flow , to the tool unit.

The tool is preferably a clinching tool for forming a clinch connection between two metal sheets. The gas flow brought to the tool unit via the hollow gas flow line is used, in particular, for a real-time functional check when the tool is in operation in accordance with a so-called tool-check function.

The essence of the invention is that the liquid line is arranged within the gas flow line.

A previously existing interfering contour on the tool can thus be reduced or minimized if a separate gas flow line and a separate liquid line are present on the outside of the tool.

At least one end section or longitudinal end section of the hollow liquid line preferably runs within the hollow gas flow line. The liquid line is guided over a length or a length section of the liquid line within the gas flow line. At least one end section of the liquid line, which extends in the flow direction of the liquid in the liquid line to one end of the liquid line or ends there, runs within the gas flow line. If the gas flow line and the liquid line are both a hose line, which is preferably the case, an advantageous hose-in-hose arrangement is implemented according to the invention. On the outside, this integral arrangement is recognizable as just one hose line according to the gas flow line due to the internal and thus hidden liquid line. This is more compact and less prone to failure during operation of the moving tool compared to two separate lines running next to one another on the outside of the tool unit.

Preferably, an external dimension such as a thickness dimension such. B. an outer diameter of the gas flow line larger than an outer dimension such as a thickness dimension such. B. an outer diameter of the liquid line, based on the portion of the gas flow line in which the liquid line is present within the gas flow line. Conversely, an external dimension of the liquid line is smaller than an external dimension of the gas flow line.

Between the outside of the liquid line and the inside of the hollow gas flow line is sufficient freeze cavity and thus space z. B. can flow as an annular gap for almost unhindered in the gas flow line. The flow in the flow direction of the gas flow from the outside to the tool unit is preferably carried out with a feed pump for conveying a gas such as air. A.

The gas flow line is preferably an air line or the gas is preferably air or alternatively, optionally, for. B. a technical gas.

The liquid line is preferably a lubricant line or a lubricating oil line or the liquid is preferably a lubricant such as a lubricating oil and / or a coolant for removing heat and / or contamination. A liquid feed pump to which the liquid line is connected with a rear or rear end in the direction of flow is also used to convey the operating fluid with a predetermined flow direction in the liquid line in the direction of the tool unit

The two fluids conducted separately from one another over the essential length of the two lines in the respective line or the mutually parallel lines for the gas or gas flow on the one hand and for the liquid on the other hand, which extends to a predeterminable end of the liquid line It therefore makes sense that at or shortly before a wetting point of the liquid-gas mixture formed or an aerosol, the gas takes the liquid with it and the two fluids mix and preferably form a fine spray mist or the aerosol. The energy for mixing is mainly provided by the flow energy of the gas flow, so that by z. B. turbulent flow conditions, the operating fluid is finely atomized or atomized. In this way, an optimal mixture of the finest liquid droplets in the surrounding gas flow is achieved or an almost ideal aerosol is formed.

The invention is advantageous compared to an arrangement with two separate lines running on the outside of the tool unit or a tool head, which represents a significant or considerable interference contour outside in the area of the tool unit, which is disadvantageous, especially in cramped working conditions in the vicinity of the tool . The interference contour is caused in particular by the two separate lines running next to one another on the outside and comprising the gas flow line and the liquid line. The liquid line and the gas flow line have so far reached in particular up to the punch side or a punch housing or up to the die side. The two lines are separated from one another or present next to one another over at least their essential length, which is present on the outside of the tool unit, for example spaced from one another or in the longitudinal direction of the lines as double or double or twin lines. This harbors an increased risk that, particularly when moving outer parts of the punch side or the die side towards the workpiece and away from the workpiece, the lines come into friction contact with objects or areas outside the tool unit adjacent to the tool unit or even get stuck or get stuck, which disrupts the work process or leads to damage to the tool unit and / or the workpiece and interrupts the work process due to downtimes. In the case of separate external lines, these must also be given a guide in order to be able to participate in a movement of at least part of the tool unit, such as the stamp unit, for example. The guidance is also disadvantageous compared to an arrangement that does not require guidance.

The disadvantages outlined are eliminated by the invention.

The gas flow line advantageously comprises a first line section which carries the gas flow and which is present outside a housing of the tool unit, the first line section connecting to the housing of the tool unit. The first line section is preferably a flexible line which can be positioned tightly on the outside of the housing. The first line section forms a comparatively small interfering contour because the flexible line section can be matched to match the outer shape of the housing. The housing is, for example, a movable section of the tool such as a hold-down housing. Thus, when the first line section z. B. is a flexible line in wave or spiral shape, for example a hose made of z. B. a plastic material, with the first line section of the gas flow line, a stroke or a stroke movement of the housing or a setting head can be compensated or followed. This is preferably possible without a guide for the first line section. The first line section is preferably in a wavy spiral shape on the outside wrapped around the tool unit or outside around the housing or the setting head. The spiral shape is z. B. related concentrically to the longitudinal axis of the tool unit or to a central longitudinal axis of the punch or die axis or to a working axis of the tool.

The housing acted upon externally by the first line section is preferably a housing of the tool unit, for example a movable section of the tool or an immovable section of the tool on the punch side or the die side, preferably a housing of a hold-down device. The housing surrounds, for example, the circumference of the punch or a central or inner part of the die.

A section of the liquid line is preferably present within the first line section or the liquid line already runs within or hidden in the longitudinal section of the gas flow line which forms the first line section of the gas flow line.

It is also advantageous that the gas flow line comprises a second line section which carries the gas flow and which is present within a housing of the tool unit.

The second line section of the gas flow line accordingly preferably begins at an inlet opening into the housing of the tool unit, to which the first line section connects. The first line section of the gas flow line is preferably designed as a hose which does not end at the inlet opening, but extends further inward via the inlet opening or protrudes through the housing and protrudes further inward into the interior of the tool unit.

The hose then ends inside at a distance from the entry point. The remaining length of the second line section is formed by inner walls in the interior of the tool unit, up to the end of the second line section of the gas flow line or up to the point where the aerosol emerges on the tool unit. There the second line section is formed by sections within the housing of the tool unit or the stamp unit, for example enclosed by inner walls of the housing. The second line section ends in the flow direction of the gas flow or the fluid mixture at the outlet opening of the tool unit, from which the aerosol emerges to the outside. This is, for example, an annular gap between the front free end of the punch and the hold-down device surrounding it.

The second line section through which the gas flow flows adjoins the first line section in the direction of flow. Either the hose formed as the first line section ends at the transition to the housing of the tool unit or the hose preferably protrudes into the interior of the tool unit, so that the hose also forms part of the length of the second line section. The transition from the first to the second line section preferably takes place directly or continuously with the hose passing through the housing. The gas or the gas stream supplied in the first line section thus continues to flow inside the tool unit as far as the outlet opening. The first line section and the second line section together form the entire gas flow line or a continuous gas flow line. The entire gas flow line preferably comprises the first line section, preferably designed as a flexible hose, and the second line section within the housing of the tool unit, which is composed of the remaining length of the hose protruding into it and the fixed sections in the tool unit.

The liquid line runs in the flow direction of the fluids preferably up to a front end of the part of the gas flow line, which is designed as a hose, into the interior of the tool unit, preferably via the point of transition of the hose on the housing further into the interior of the tool unit. Thus, in the interior of the tool unit, there is preferably a longitudinal piece of the double hose with an inner liquid line and an outer gas flow line. The liquid line extends through the first line section of the gas flow line into the second line section of the gas flow line.

It is not excluded that the second line section of the gas flow line comprises a fluid mixing chamber in the interior of the housing of the tool unit, into which the operating fluid supplied via the liquid line also passes. The fluid mixing chamber is inside z. B. a hold-down housing or inside the punch side or inside the die side.

In the fluid mixing chamber, the operating liquid is carried along by the flowing gas stream and atomized. From the mixing chamber, the aerosol that is formed travels in the direction of flow to the outlet opening of the tool unit, which means the end of the gas flow line or the end of the second line section. There the fine aerosol mist emerges and wets the sections to be wetted.

The gas flow line is to be understood as a hollow or gas-tightly enclosed guide for the flowing gas.

A z. B. turbulent mixing of the operating fluid with the gas flow takes place. Mixing takes place shortly before the mist-like aerosol formed emerges, the aerosol then reaching the relevant section of the workpiece to be wetted, which is advantageous.

A comparatively longer subsequent flow path of the aerosol is avoided, which otherwise means a deterioration in the atomization or aerosol state due to, for example, condensation processes of the operating fluid due to the agglomeration of several fine droplets while it is flowing through the further line, for example due to deposits of the operating fluid Inner walls of the continuing line.

This is avoided according to the invention. This is because the operating fluid only comes into contact with the gas flow shortly before the end of the gas flow line.

It is advantageous if the liquid line has a front end in the flow direction of the operating liquid, the gas flow guided in the gas flow line taking with it the operating liquid exiting at the front end of the liquid line, with a distance between the end of the liquid line and a front end of the gas flow line in the flow direction of the gas flow is between zero centimeters and ten centimeters. This achieves an optimized wetting effect.

On the one hand, an ideal or comparatively late point in time for aerosol formation is made possible and, on the other hand, the aerosol just formed is prevented from separating again before it hits the section to be wetted. The aerosol is advantageously retained up to the outlet opening of the gas flow line or the second line section, where the aerosol emerges from the tool unit. During the comparatively short flight length of the aerosol as it flows to the outlet opening, undesired segregation due to condensation of the operating fluid in the interior of the tool unit is minimized.

In the borderline case, the ends of the liquid line and the gas flow line can be at the same level or in one plane or can be aligned with one another.

Otherwise, viewed in the direction of flow of the operating liquid or the gas or the aerosol formed, the gas flow line ends before the end of the gas flow line. Since this end can also be an outlet opening for the aerosol on the punch or die side, the end of the gas flow line can coincide exactly with the outlet opening or the end of the gas flow line is offset slightly inwards to the end of the gas flow line or . to the aerosol outlet opening inside the punch side or inside the die side.

The direction of flow of the gas flow specified by the gas flow line and the direction of flow of the operating fluid specified by the liquid line coincide.

The liquid line is preferably designed as a flexible line, such as a hose, for supplying the operating liquid from a reservoir of the operating liquid to the point where the aerosol is formed.

An advantageous modification results when the diameter of the gas flow line is greater than the diameter of the liquid line. Over at least the extent of the gas flow line and the liquid line on the outside of the tool unit, the gas flow line and the liquid line preferably have a continuously constant outer diameter, for example in a cylindrical shape. At least the first line section of the gas flow line and the liquid line preferably each have a circular cross section. For example, the gas flow line has an outer diameter between preferably 5 to 20 millimeters. The liquid line has an outer diameter of preferably 1 to 8 millimeters.

A cross-sectional area of the liquid line is preferably 5 to 30 percent of the cross-sectional area of the gas flow line or of the first line section of the gas flow line. The second line section of the gas flow line in the interior of the tool unit can differ markedly therefrom or be larger and / or smaller over the inner course.

It is also advantageous that the first line section of the gas flow line extends up to a section of the ram side surrounding the ram. This is advantageous for the approach of the gas flow line, since the ram side usually requires lubrication. The aerosol is preferably only formed within the section surrounding the plunger on the outside, where the liquid hose ends, surrounded by the gas flow hose. From there the aerosol can even penetrate into the finest gap areas in the interior of the punch side, so that the relevant sections are wetted with the lubricating liquid.

An advantageous variant consists in that the first line section of the gas flow line reaches up to the die side. This is advantageous, for example, if the die side needs lubrication, outside and / or inside.

On a tool according to the invention, only the punch side or only the die side or the punch side and the die side can experience lubrication.

With a to a base body z. B. linearly moved plunger side, the first line section of the gas flow line is preferably wrapped in a spiral shape around the section surrounding the plunger several times circumferentially closed.

The gas flow line and / or the liquid line advantageously comprises a flexible line. The entire liquid line and the entire first line section of the gas flow line present on the outside of the tool unit are preferably a flexible line or a plastic hose, as a hose-in-hose line or as a pipe-in-pipe line or . as a double line.

Advantageously, a flexible line can be set up and attached to the tool in an uncomplicated manner, in particular without rigid fasteners, which, for. B. would be necessary for a rigid metal line. Due to the material flexibility, a shape of the flexible line can be specified individually, for example in the case of suitable plastics such as special thermoplastics with the help of the heating of the flexible line for the shaping of the flexible line. The predetermined shape of the line advantageously remains almost unchanged after the flexible line has cooled down.

For example, the relevant line can be adapted over its extension to a desired course on the tool. Advantageously, the line in question can be placed in close contact with a contour of the outside of the tool or the tool unit such as the punch or die side. This minimizes the space required for the lines and thus any interference contour on the tool caused by the lines.

The respective flexible line, which is axially open on both sides for the flow of fluid, is preferably a hose made of, for. B. a plastic, rubber material or composite material. The flexible line comprises a fluid-tight or closed tight wall, for example with a wall thickness of less than one millimeter to z. B. several millimeters. Via hose connections such. B. screw and / or clamp connections or connections, the flexible line can easily be connected tightly to mating sections, in particular to the tool unit or a housing on the punch side or the die side. The flexible line can advantageously be transparent or colored.

A modification is advantageously characterized in that the first line section of the gas flow line is present in a spiral shape on the outside around a section of the tool unit. This saves space and, due to the extendable spiral in its longitudinal direction, enables length compensation with automatic resetting of the pulled apart first line section of the gas flow line.

In addition, the first line section of the gas flow line is present in a defined position or orientation due to the spiral shape. If the first line section consists of a plastic, the spiral shape can be specified permanently or permanently.

The first line section of the gas flow line is advantageously provided in a spiral shape on the outside around a section of the tool unit that is movable on the tool when the tool is in operation. So it is possible that, for. B. with a movement of the part of the tool unit to which the first line section connects, the spiral shape of the first line section is resiliently or elastically or accordion-like lengthened and then automatically shortened again, which is advantageous.

If the first line section of the gas flow line is laid in a spiral around a hold-down housing that is movable when the tool is in operation, directly lying on the outside or circumferentially, the first line section of the gas flow line can easily join the movement of the hold-down housing, in particular without experiencing damage or damage to cause.

An advantageous development results from the fact that the tool is designed as a clinching tool. Accordingly, the punch of the clinching tool is designed as a clinching punch and the die of the clinching tool is designed as a clinching die. In the case of clinching tools, it is essential that the tool sections are wetted with a lubricating fluid.

In the case of clinching tools, a tool-check function can also be set up with the provision of the gas flow. With the gas flow brought in with the gas flow line or with the application of the gas flow to the tool unit, a sensor or z. B. a gas pressure detection in the shortest possible time or in real time, if there is damage to the tool. Here the punch and die side are on top of each other driven and the resulting back pressure is a measure of the intactness of the die and the punch-side unit. The gas pressure detection measures the gas pressure in the gas flow in an interior of the tool, which occurs when the tool is closed, without a workpiece to be machined being clamped between the punch side and the die side. Damage to the tool or the tool unit, such as a crack, leads to a detectable leakage of gas to the outside and thus to a measurable pressure drop compared to a reference gas pressure when the tool unit is undamaged or fully functional.

The gas pressure detection advantageously picks up a gas pressure when the tool is closed or when the tool unit is closed. There is no workpiece clamped between the punch side and the die side. By z. B. a crack in a tool part of the punch or die side, a comparatively lower pressure is detected and thus the damage is recognized immediately. The gas pressure is preferably tapped in the gas flow line, in particular in its first line section, or in a volume which is openly connected to or with the gas flow line.

The invention also extends to a device for converting a first conduit with a first diameter into a second conduit which has a diameter greater than the first diameter.

The device preferably has connections such. B. line connections or hose connection points and is designed, for example, as a cast metal component. The device enables a simple introduction of the smaller-diameter liquid line aligned in parallel into the interior of the larger-diameter gas flow line, preferably within a comparatively short longitudinal section of the lines of, for. B. a few centimeters.

The first line preferably carries a liquid or, based on the tool according to the invention in question, carries the operating fluid like a lubricant. The second line preferably carries a gas such as air or carries the gas flow in relation to the tool according to the invention.

The device preferably has a housing and a hollow or inner volume which is tightly enclosed by the housing. The inner volume can be connected on the outside via the plurality of hose connections, preferably via at least three hose connections, or is open to the outside if no lines are connected to the connections.

In addition, connections for the lines such as screw and / or clamp line connections and possibly other arrangements are formed on the device, which provide openings or are open to the outside or to the environment and to the inner volume. At least three separate line connections are preferably provided.

In relation to the tool, the liquid line and the gas flow line each connect to the device via a separate connection on the inlet side. On the outlet side, both lines lead through the same or a common connection away from the device. This means that at least three connections are required on the device. The transferred state of the lines, with the liquid line running within the gas flow line, is related to the outlet side of the device. The respective fluids in the lines flow through the device from the inlet side to the outlet side.

The device can preferably be used depending on the direction or depending on the flow direction, based on the flow directions of the media or fluids through which the lines flow.

The connections are used for the tight connection of the respective line. When lines are connected without another connection being open, the inner volume is tightly closed to the outside and line-connected to the outside only via the inside of the lines.

With the connections, two connection types are possible for a respective line.

One type of connection is such that an open end of the line brought up to the device connects to the connection or an end section of the line with the open end protrudes into the interior volume. In any case, the fluid brought up in the relevant line gets into the internal volume of the device.

The same connection type is set up again on another or further connection. The internal volume of the device is thus open to corresponding line sections at two connections. Thus, a fluid reaches the internal volume of the device via a supply line connection and, due to z. B. a pumping or flow effect in the line via the further outgoing connection in the other line section and is led out of the interior volume. This scenario is relevant or can be set up for the second line with a larger diameter.

The other type of connection, which is used for the first line with a smaller diameter or the liquid Line applies is such that the first line itself does not end or is not interrupted by the device, but through it in one piece, as uninterrupted z. B. preferably thin hose line. The first line leads separately through an associated further connection of the device that leads into the interior volume, traverses this and leaves the device via another connection of the device that leads out of the first line. This other outgoing connection of the first line is the outgoing connection of the other line section of the second line or the gas flow line. This transfers the first line to the second, larger-diameter line. From the outgoing connection of the first line or the outgoing connection of the second line, the two lines run together or the first line is accommodated within the second line. Both fluids flow in the same direction and mix as soon as the two fluids meet, when the first line ends and the gas flow outside takes the operating fluid from the first line and atomizes it.

Finally, the present invention relates to a tool unit with a tool according to one of the configurations described above and / or to a device as described above for converting a first line into a second line. The advantages shown can thus be achieved.

Figure list

• 1 eine Seitenansicht auf einen Werkzeugbügel mit einem erfindungsgemäßen Werkzeug,
• 2 ein Detail der Anordnung gemäß 1 teilweise geschnitten und
• 3 ein weiteres Detail der Anordnung gemäß 1 teilweise geschnitten.

Further features and advantages of the invention are explained in more detail on the basis of a schematically illustrated embodiment of the invention. In detail shows:

• 1 a side view of a tool bracket with a tool according to the invention,
• 2 a detail of the arrangement according to 1 partially cut and
• 3 a further detail of the arrangement according to 1 partially cut.

1 shows a tool bracket designed as a C-bracket 1 comprising a tool 2 with a tool unit 3 who have favourited a stamp page 4th and a die side 6th with a die 7th having.

With a drive A such as a pneumohydraulic drive is a stamp 5 the stamp side 4th linearly drivable back and forth. The drive A is basically arbitrary, for example motorized, hydraulic, pneumatic or pneumohydraulic.

The die 7th is spaced from the stamp side 4th and opposite a free end of the punch 5 present so that an in 1 Workpiece W indicated by dashed lines, for example two sheet metal layers for machining with the tool 2 or with the tool unit 3 between the stamp side 4th and the die side 5 is firmly positioned. The tool 2 is for example a clinching tool.

Also includes the tool 2 a liquid line 8th with an outer diameter d in which a working fluid 10 like a lubricant a portion to be wetted 9 the tool unit 3 is feedable. That’s the section 9 with the operating fluid 10 wettable.

The tool 2 additionally has a gas flow line 11th with an outer diameter D for the introduction of a gas flow 12th to the tool unit 3 . The liquid line 8 is within the gas flow line 11th arranged.

The gas flow line 11th includes the gas stream 12th in the direction of flow S1 of the gas flow 12th in the gas flow line 11th leading first line section 13th that is outside of an enclosure 15th the tool unit 3 is available. The first line section 13th closes to the housing 15th the tool unit 3 at. From the point at which the first line section 13th ends, a second line section begins 14th the gas flow line 11th . It is preferably such that a hose end section is somewhat inside the housing 15th is present or in the interior of the tool unit 3 protrudes. This allows the second line section 14th comprise a short piece formed by the hose end portion. The second line section 14th preferably ends at the front free end 4a the stamp unit or, as described below, a free front end 6a the die unit 6th .

The gas flow line 11th comprises following the first line section 13th one the gas flow 12th leading second line section 14th that is inside the case 15th the tool unit 3 is available.

The liquid line 8th points in the flow direction S2 of the operating fluid 10 in the liquid line 8th a front end 16 on. At the front end 16 the operating fluid enters 10 in flow direction S2 from the liquid line 8th the end. The operating fluid meets at the outlet or in the further course of the flow 10 on the one in the gas flow line 11th guided gas flow 12th . The gas flow 12th takes on the front end 16 the liquid line 8th leaking operating fluid 10 with and atomizes the operating fluid 10 in the finest liquid droplets, which is due to the gas flow 12th or the flowing gas provided flow energy is enabled. The gas, such as preferably air, and the finely atomized liquid form an almost optimal aerosol, which results in a high wettability with an almost ideal or extremely thin liquid film of lubricant on the section to be wetted 9 enables.

A distance A between the front end of the liquid line in the flow direction S2 8th and one in the flow direction S1 of the gas flow 12th front end 17 of the gas flow line 11th is between 0 centimeters and 10 centimeters for the tool 2 about 0.5 centimeters.

The diameter D of the gas flow line is 11 is accordingly larger than the diameter d of the liquid line 8th .

The first line section 13th the gas flow line 11th hands the stamp to one 5 surrounding section 18th or a housing section of the stamp side 4th approach.

Another gas flow line 19th reaches to the die side 6th approach according to 1 and 3 . Another liquid line is located therein or inside or hidden 20th available.

The first line section 13th the gas flow line 11th has a spiral section 13a on that spirals around the section 18th the tool unit 3 or the stamp side 4th is present. The section 18th the stamp side 4th is a to a basic body 21 of the tool 2 part of the tool that can move linearly in the direction of S3 and S4 2 .

The section 18th on the tool 2 is in operation of the tool 2 at least temporarily movable to the stamp side 4th to the one on the die side 6th supported workpiece W according to 1 move towards S3 and after one of the punch 5 to move the machining operation of the workpiece W carried out with a driven punch movement, for example to form a clinch connection, back in the direction S4.

One device 22nd serves to lead through a first line with a first smaller diameter d like the liquid line 8th respectively. 20th into a second line, such as the gas flow line 11th respectively. 19th with a diameter D larger than the first diameter d

The device 22nd preferably has a housing 23 and one from the housing 23 tightly enclosed hollow or inner volume 24 on. The interior volume 24 is via several, preferably via at least three hose connections 25th , 26th , 27 Can be connected on the outside or open to the outside if there are no lines at the hose connections 25th , 26th , 27 are connected. The hose connections 25th , 26th , 27 are for example screw and / or clamp line connections.

Inside the device 22nd or in the interior volume 24 there is air that has passed through the hose connection 26th connected gas flow line 11th is introduced. The air flows through the interior volume 24 to the hose connection 27 and via the gas flow line 11th away in the direction of S1 or to the housing 15th .

The liquid line 8th goes continuously through the device 22nd via the hose connection 25th in and over the hose connection 27 out. From the hose connection 27 is the liquid line 8th surrounded by the larger-diameter gas flow line 11th .

The formation of an aerosol takes place at the end of the liquid line 8th instead of when the surrounding gas or air flow is the liquid 10 takes away and fogged. This takes place just before the end of the gas flow line 11th instead of at the distance A between the end of the shorter liquid line 8th and the gas flow line 11th .

The device 22nd and the liquid line 20th and the gas flow line 19th on the die side according to 3 is structured accordingly.

Not shown in the 2 and 3 is a gas pressure measurement 28 (see 1 ) showing the gas pressure in the internal volume 24 detected and so recognizes when between the stamp side 4th and the die side 6th clamped workpiece W an error or damage to the stamp side 4th and / or the die side 6th is present, which can be detected with a pressure drop compared to a comparison pressure value.

List of reference symbols

1

Tool holder

2

tool

3

Tool unit

4th

Stamp side

4a

end

5

rubber stamp

6th

Die side

6a

end

7th

die

8th

Liquid line

9

section

10

Operating fluid

11th

Gas flow line

12th

Gas flow

13th

Line section

13a

section

14th

Line section

15th

casing

16

end

10

end

18th

Housing section

19th

Gas flow line

20th

Liquid line

21

Base body

22nd

contraption

23

casing

24

Internal volume

25th

Hose connection

26th

Hose connection

27

Hose connection

28

Gas pressure detection

Claims (12)

Tool (2) with a tool unit (3) which has a punch side (4) with a punch (5) and a die side (6) with a die (7), the die (7) being opposite a free end of the punch ( 5) is present so that a workpiece for machining with the tool unit (3) can be positioned between the punch side (4) and the die side (6), the tool (2) comprising a liquid line (8, 20), in which an operating fluid (10) can be fed to a section (9) of the tool unit (3) in order to wet the section (9) with the operating fluid (10), and wherein the tool (2) has a gas flow line (11, 19) for feeding a gas flow (12) to the tool unit (3), characterized in that the liquid line (8, 20) is arranged within the gas flow line (11, 19). Tool after Claim 1 , characterized in that the gas flow line (11, 19) comprises a first line section (13) which carries the gas flow (12) and which is present outside a housing (15) of the tool unit (3), the first line section (13) connects to the housing (15) of the tool unit (3). Tool after Claim 1 or Claim 2 , characterized in that the gas flow line (11, 19) comprises a second line section which carries the gas flow and which is present within a housing of the tool unit. Tool according to one of the preceding claims, characterized in that the liquid line has a front end in the direction of flow of the operating liquid, the gas flow guided in the gas flow line (11, 19) taking with it the operating liquid emerging at the front end of the liquid line, wherein a distance between the end of the liquid line and a front end of the gas flow line (11, 19) in the flow direction of the gas flow is between zero centimeters and ten centimeters. Tool according to one of the preceding claims, characterized in that the diameter of the gas flow line (11, 19) is greater than the diameter of the liquid line. Tool according to one of the preceding claims, characterized in that the first line section of the gas flow line (11, 19) reaches up to a section of the punch side surrounding the punch. Tool according to one of the preceding claims, characterized in that the first line section of the gas flow line (11, 19) extends to the die side. Tool according to one of the preceding claims, characterized in that the gas flow line (11, 19) and / or the liquid line comprises a flexible line. Tool according to one of the preceding claims, characterized in that the first line section (13) of the gas flow line (11) is present in a spiral shape on the outside around a section (18) of the tool unit (3). Tool according to one of the preceding claims, characterized in that the first line section (13) of the gas flow line (11) spirally on the outside around a section (18) of the tool unit (3) which is movable on the tool (2) when the tool (2) is in operation. is present. Device (22) for transferring a first line (8, 20) with a first diameter into a second line (11, 19) which has a diameter larger than the first diameter. Tool bracket (1) with a tool (2) according to one of the Claims 1 until 10 and a device (22) Claim 11 .

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