DE102018132638A1 - Machining tool, in particular press, for machining workpieces and method for operating such a machining tool - Google Patents

Abstract

The invention relates to a processing tool (1) for processing workpieces, with at least one waste opening (2) for waste resulting from the processing, with at least one waste flap (4) assigned to the waste opening (2), which is located between at least a partial area of the waste opening ( 2) closing position and at least one open position releasing the partial area, and with at least one line (5) through which a fluid can flow, by means of which a movement of the waste flap (4) can be effected, with at least one pressure sensor (10), by means of which a pressure in the line (5) can be detected.

Description

The invention relates to a machining tool, in particular a press, for machining workpieces according to the preamble of patent claim 1. Furthermore, the invention relates to a method for operating such a machining tool according to the preamble of patent claim 5.

Such machining tools for machining workpieces and such methods for operating such machining tools are already well known from the general prior art. The respective machining tool can be designed as a press, which is also referred to as a press tool. The processing tool, in particular the press, is, for example, part of a processing plant, in particular a pressing plant. The respective workpiece can, for example, be machined using the respective machining tool in such a way that the respective workpiece is reshaped or can be reshaped using the respective machining tool. In particular, the processing can be a cutting, so that, for example, the respective workpiece is cut, in particular cut or punched, by means of the processing tool as part of the processing. As part of the cutting process, for example, at least a first part of the workpiece is separated from a remaining second part of the workpiece. The first part is waste, for example, which is not further processed. The second part is then, for example, a remaining, new workpiece, which is further processed.

The processing tool has a waste opening for waste resulting from the processing. This means that the waste and thus for example the first part can be passed through the waste opening. As a result, the waste can, for example, be fed to a waste container, in particular a waste container, and be received in the waste container. The waste container is thus used to collect or collect and collect waste resulting from the processing of the materials.

In particular, if the waste is formed from a metallic material, since, for example, the respective workpiece is formed from a metallic material, in particular from a steel, the waste is also referred to as scrap, in particular as metal scrap or steel scrap, so that the waste opening also is called scrap opening.

The processing tool also has at least one waste flap assigned to the waste opening, which is also referred to as a scrap flap. The waste flap can be moved between a closed position closing at least a partial area of the waste opening and at least one open position releasing the partial area. In addition, at least one line is provided, through which in particular a gaseous fluid can flow, by means of which a movement of the waste flap can be effected.

Such a waste opening and such a waste flap are, for example EP 2 882 558 B1 as known.

In addition, the EP 3 090 846 B1 a plate processing system. Of the EP 2 242 029 A1 A device for separating and checking coins can be seen as known.

The object of the present invention is to further develop a machining tool and a method of the type mentioned at the outset in such a way that particularly advantageous operation of the machining tool can be realized.

This object is achieved according to the invention by a processing tool with the features of claim 1 and by a method with the features of claim 5. Advantageous embodiments of the invention are the subject of the dependent claims.

A first aspect of the invention relates to a machining tool for machining workpieces, in particular for manufacturing vehicles such as motor vehicles. In other words, the workpieces are used, for example, to manufacture vehicles, in particular motor vehicles such as motor vehicles or preferably passenger vehicles. The machining tool can be designed as a press, which is also referred to as a press tool or press tool. The machining of the respective workpiece can be a reshaping of the respective workpiece, so that, for example, the respective workpiece can be reshaped by means of the machining tool. In particular, the processing can include a cutting, in particular a cutting or punching, of the respective workpiece, so that, for example, the respective workpiece can be cut, in particular cut, using the processing tool. In the course of the cutting, for example, at least a first part is separated or separated from at least one remaining, second part of the respective workpiece. The first part is, for example, a waste product also referred to as waste, since the first part is not processed further, for example, but is removed from a processing process. In contrast, the second part, for example, is further processed and used as a further, new workpiece, from which, for example, a product, in particular a vehicle, can be produced. The first part is therefore also referred to as waste or waste product. In particular, if the respective workpiece and thus the respective first part are formed from a metallic material, in particular from a steel, the waste is also referred to as scrap, in particular metal or steel scrap.

The processing tool has at least one waste opening, also called a scrap opening, for waste resulting from the respective processing. This means that the waste, which results from the respective processing, can be passed through the waste opening. In addition, the machining tool has at least one waste flap which is assigned to the waste opening and is also referred to as a scrap flap and which can be moved, in particular pivoted, between a closed position and at least one open position, in particular relative to a base of the machining tool. In the closed position, the waste flap closes at least a portion of the waste opening, so that the waste opening is at least partially, in particular at least predominantly or completely, closed by the waste flap in the closed position of the waste flap. In the open position, however, the waste flap opens the waste opening, so that in the open position the waste can be passed through the waste opening. In other words, the waste can penetrate the waste opening when the waste door is open. This makes it possible, for example, to pass the waste through the released waste opening and thus to feed it via the waste opening to a waste container which is designed, for example, as a waste container. The waste container is also referred to as a scrap container or scrap container and is used to pick up or collect the waste resulting from the processing and in particular to collect it. If the waste container is filled with waste, in particular completely, the waste is, for example, transported away from the processing tool by means of the waste container and, for example, fed to a reuse process.

In addition, the machining tool has at least one line, also referred to as a fluid line, through which a fluid can flow, by means of which a movement of the waste flap can be effected. In other words, the waste flap can be moved by means of the fluid. The fluid is, for example, a gas or gaseous. Alternatively, it is conceivable that the fluid is a liquid. The waste flap can thus be moved pneumatically or hydraulically.

In order to be able to implement a particularly advantageous and, in particular, low-wear operation of the machining tool, at least one pressure sensor is provided according to the invention, by means of which a pressure in the line or a pressure of the fluid prevailing in the line can be detected. This means that the pressure prevailing in the line can be detected, ie measured and monitored, by means of the pressure sensor, which is also referred to as a pressure meter or pressure cell, so that, for example, operation of the processing system can be adapted to the detected pressure. In particular, it is possible by means of the pressure sensor and by means of the detection of the pressure in the line, which can be effected by means of the pressure sensor, to detect any leakage, via which the fluid, for example, can undesirably flow out of the line, particularly early, so that further and undesired leakage resulting severe damage to the machining tool can be avoided. Since the leak can be detected particularly early, measures can be taken particularly early to remedy the leak or to avoid further damage resulting from the leak, so that the tool can be operated with particularly little wear. In particular, downtimes of the machining tool can be avoided or at least kept particularly low, so that the machining tool according to the invention ensures that workpieces can be machined in a cost-effective manner.

In a particularly advantageous embodiment of the invention, the machining tool comprises at least one actuating device which has at least one first actuating element and at least one second actuating element. The second actuating element can be acted upon with the fluid at least indirectly, in particular directly, and thus can be moved, in particular translationally, relative to the first actuating element. As a result, the waste flap can be moved by means of the second actuating element. For example, the second actuating element is coupled or can be coupled at least indirectly, in particular directly, to the waste flap. The second actuating element is preferably articulated at least indirectly, in particular directly, to the waste flap. The line is designed as a supply line, by means of which the fluid can be fed to the second actuating element, in particular for opening the waste flap. In other words, the second actuating element can be supplied with the fluid via the line or by means of the line or acted upon. This embodiment is based on the knowledge that, in particular, monitoring the pressure in the feed line is particularly advantageous in order to ensure low-wear and therefore advantageous operation of the machining tool.

The actuating device is designed, for example, as a pneumatic or hydraulic cylinder, which is also simply referred to as a cylinder. The cylinder comprises the first actuating element, which is, for example, a housing delimiting a working space. In addition, the cylinder comprises the second actuating element, which has, for example, a piston and a piston rod connected to the piston. The piston and the piston rod also form a so-called piston unit, which is translationally movable along a direction of movement relative to the housing. At least the piston is accommodated in the working space and thus in the housing, so that, for example, the piston and the housing partially delimit at least one working chamber. The work chamber is part of the reception room, for example. The piston can be designed as a single-acting piston or as a double-sided piston. The fluid can be a gas, in particular air and preferably compressed air, or a liquid.

The feature that the fluid can be fed to the second actuating element and thus to the piston by means of or via the feed line, in particular to open the waste flap, in particular to understand that the working chamber can be supplied with the fluid flowing through the feed line by means of the feed line. so that the fluid can be introduced into the working chamber via the supply line, in particular in order to thereby open the waste flap. By introducing the fluid into the working chamber, the fluid which is directed into or flows into the working chamber is applied to the piston, as a result of which, for example, the piston unit is extended out of the housing or retracted into the housing. This opens the waste flap, for example. In other words, the piston unit is moved translationally relative to the housing when the piston is acted upon by the fluid, as a result of which the waste flap is moved, in particular opened. The waste flap is opened, in particular by moving the piston unit out of the housing, that is to say it is moved from the closed position into the open position. For example, by moving the piston unit into the housing, the waste flap is closed, that is to say moved from the open position to the closed position or in the direction of the closed position.

In a further embodiment of the invention, the processing tool comprises an electronic computing device, by means of which, for example, the processing tool can be operated, in particular regulated or controlled. The electronic computing device is designed, for example, as a programmable logic controller (PLC), which can be programmed, for example, on a digital basis.

The electronic computing device is designed to receive at least one signal provided by the pressure sensor, in particular electrical signal, which characterizes the pressure detected by the pressure sensor, and to adjust, in particular to control or to supply, the line with the fluid as a function of the received signal regulate. As a result, the electronic computing device, which is also referred to as a control device, for example, can cause the waste flap to move, in particular open and / or close, as a function of the received signal, by the electronic computing device supplying the line with the fluid or a flow of the Influences or adjusts fluids through the line. In this way, the processing tool can be operated by means of the electronic computing device as a function of the pressure detected by the pressure sensor, so that a particularly advantageous and particularly low-wear operation of the processing tool can be ensured.

It has proven to be particularly advantageous if the machining tool has at least one electrically controllable valve element, which is also simply referred to as a valve. The electronic computing device is designed to electrically control the valve element as a function of the received signal, as a result of which the valve element can be switched between switching states of the valve element. As a result, the supply of the line with the fluid or a flow of the fluid through the line can be set. The valve element is designed, for example, as an electromagnetic valve element. In particular, the valve element can be designed as an, in particular electromagnetic, 4/3-way valve or 5/3-way valve, in particular with a floating center position.

Characterized in that the electronic computing device controls the valve element in dependence on the received signal and thus in dependence on the detected pressure, the valve element is switched depending on the signal and thus in dependence on the detected pressure or switched into a respective one of the switching states, so that the supply of the Line with the fluid depending on the detected pressure in the line is carried out. As a result, the waste flap is moved via the valve element by means of the electronic computing device as a function of the signal and thus as a function of the pressure detected.

If the line is designed as the aforementioned feed line, the fluid can be introduced into the line via the valve element, for example, or the line can be supplied with the fluid via the valve element, so that, for example, the valve element flows in the flow direction of the line flowing through and towards the actuating device flowing fluid is arranged upstream of the line or upstream of the actuating device.

A first of the switching states is, for example, a blocking state or a blocking position of the valve element. In the blocking state, the valve element prevents the fluid from flowing into the line, so that in the blocking state, no fluid flows into the line via the valve element. A second of the switching states is, for example, a release state or a release position. In the release state, the valve element releases the line for an inflow of the fluid into the line, so that in the release state the fluid flows into the line via the valve element and flows or flows to the actuating device via the line.

The fluid is provided, for example, by a fluid source, in particular a pressure accumulator, so that, for example, the valve element is arranged in the flow direction of the fluid flowing from the fluid source to the actuating device downstream of the fluid source and upstream of the actuating device and preferably upstream of the line.

A second aspect of the invention relates to a method for operating a machining tool, in particular a machining tool according to the first aspect of the invention, for machining workpieces. In the method, at least one waste flap, which is assigned to a waste opening for waste resulting from the processing, is moved between a closed position closing at least a partial area of the waste opening and at least one open position releasing the partial area by means of a fluid flowing through a line.

In order to be able to implement a particularly advantageous and, in particular, low-wear operation of the machining tool, it is provided according to the invention that a pressure in the line is detected by means of at least one pressure sensor. Advantages and advantageous configurations of the first aspect of the invention are to be regarded as advantages and advantageous configurations of the second aspect of the invention and vice versa.

It has proven to be particularly advantageous if an electronic computing device is provided which receives a signal, in particular an electrical signal, provided by the pressure sensor and characterizing the pressure detected by means of the pressure sensor and adjusts the supply of the line with the fluid as a function of the received signal . As a result, the waste flap is moved depending on the pressure prevailing in the line, so that particularly advantageous and, in particular, low-wear operation of the machining tool can be represented.

Another embodiment is characterized in that at least one electrically controllable valve element is provided, the electronic computing device electrically actuating the valve element as a function of the received signal, as a result of which the valve element is switched between switching states and the supply of the line with the fluid is thereby set. This can ensure particularly advantageous and low-wear operation.

In a particularly advantageous embodiment of the invention, the method has a first step, which is also referred to as the first method step. In the first step of the method, the electronic computing device actuates the valve element electrically, as a result of which the valve element is moved into a release position from the blocking position described above, in which the valve element prevents the fluid from entering or flowing into the line via the valve element which the fluid is introduced or flows into the line via the valve element. This will move the waste door to the open position. In other words, in the blocking position of the valve element, no fluid flows into the line via the valve element, so that the waste flap does not move in the blocking position. In other words, the blocking position prevents movement of the waste flap, for example, so that when the valve element is in the blocking position, the waste flap remains or remains in its position previously set, for example.

The method also has a second step following the first step, which is also referred to as the second method step. In the second step, the electronic computing device actuates the valve element electrically, as a result of which the valve element is moved from the release position into the blocking position. Subsequently the fluid does not flow into the line via the valve element, so that the waste flap remains or remains at least temporarily in the open position resulting from the first step.

The method also has a third step, which follows the first step, which is also referred to as the third method step. During the third step of the method following the second step, in particular directly or immediately, the valve element remains in its blocking position resulting from the second step or set in the second step, and during the third step the pressure in the line is measured by means of the pressure sensor recorded and thereby monitored.

The method also has a fourth step that follows the third step, which is also referred to as the fourth method step. In the fourth step following the third step, the electronic computing device actuates the valve element electrically as a function of the pressure detected during the third step, as a result of which the valve element is moved from the blocking position into the release position. As a result, the fluid can flow into the line via the valve element, as a result of which, for example, the waste flap is held in the open position or excessive movement of the waste flap, in particular from the open position, into or in the direction of the closed position is prevented.

The fourth step is preferably carried out after the third step and only when the pressure detected during the third step exceeds a threshold value and the electronic computing device specifically provides a movement of the waste flap from the open position into the closed position. Alternatively or additionally, the fourth step is carried out after the third step and preferably only if it is detected during the third step that the pressure recorded during the third step falls below the threshold value or falls below the threshold value, but in this case, for example, by the electronic computing device no movement of the waste flap from the open position into the closed position is specifically provided. For example, due to undesirable leakages, the pressure in the line can decrease during the third step, since, for example, fluid can undesirably escape from the line. As a result, the pressure in the line drops below the threshold value and the waste flap can undesirably move from the open position towards the closed position. This can now be detected by means of the pressure sensor, since it is detected by means of the pressure sensor that the pressure falls below the threshold value. If it is detected by means of the pressure sensor that the pressure in the line falls below the threshold value, the valve element is switched to the release position or in the release state, thereby preventing a further drop in the pressure in the line. Furthermore, excessive movement of the waste flap in the direction of the closed position can thereby be prevented or the vehicle flap can be moved back from an intermediate position between the open position and the closed position back into the open position and thereby kept sufficiently open, in particular until the electronic computing device targeted closing of the waste flap is provided.

In particular, this embodiment makes it possible to detect undesirable and excessive leaks, so that appropriate countermeasures can be taken particularly early in order to eliminate these leaks. In particular, such leaks can be detected early enough so that further undesirable damage to the machining tool resulting from such leaks can be avoided.

The invention is based in particular on the following finding: Usually, scrap flaps of machining tools are actuated permanently by the valve when they are opened or in their respective open position. In other words, the valve is kept permanently in its release state, so that fluid can permanently flow into the line via the valve and flow to the processing device, in particular if one or more leaks exist. Due to this permanent activation of the valve or the scrap flap, any leakage is not noticed, so that such leakage can lead to further undesirable damage, such as a damaged piston seal. If such a leak is not noticed, wear of the cylinder can proceed in such a way that the scrap flap suddenly stops moving and in particular can no longer be opened and closes automatically, for example due to its weight, since it is no longer held open by the fluid can be. As a result, the wear of the cylinder has progressed so far that there is an unscheduled and very long and, for example, several hours of failure of the processing tool, since very extensive maintenance or servicing of the cylinder or processing tool is required, in particular in connection with a complex troubleshooting in the entire hydraulic or pneumatic system.

These problems and disadvantages can now be avoided by means of the invention, since any leaks can be detected early and can be remedied accordingly. As a result, excessive wear and thus excessive downtimes of the machining tool can be avoided. As a result, the invention enables a timely and cost-effective machining of workpieces.

It has proven to be particularly advantageous if, during the second step and during the third step, control of the valve element by the computing device is omitted and / or the waste flap is kept in the open position by means of the fluid which was fed into the line in the first step becomes. In this way, any leaks can be detected particularly easily and early using the pressure sensor.

Finally, it has proven to be particularly advantageous if, depending on a time period which lies between the second step and the fourth step, at least one optical and / or acoustic and / or haptic information signal is output by means of the electronic computing device. The time period is, for example, a time period during which the third step is carried out. The time period can be used to determine whether and in particular how quickly the pressure, which initially exceeds the threshold value, decreases and subsequently drops below the threshold value, so that a severity of the leakage can be determined on the basis of the time period. If, for example, the pressure initially exceeding the threshold value drops very quickly above the threshold value, so that the time span is very short, it can be concluded that there are very large or several leaks. However, if the time span is longer, it can be concluded that there is a leak, but it is rather small or slight. If, for example, the time span is greater than or equal to five minutes and in particular the time span is in a range of five to and including 30 minutes, a minor leak can be concluded. However, if the time span is less than five minutes, a strong leak can be concluded. The advisory signal is thus, for example, a warning message, by means of which a person can be informed, for example, of the presence of a leak. The advisory signal can include, for example, the following text: “scrap flap at the front, middle or rear with low leakage”. The warning signal can also include the following text, for example: “Scrap flap at the front, middle or at the back, severe leakage”.

• 1 eine schematische und perspektivische Draufsicht eines erfindungsgemäßen Bearbeitungswerkzeugs zum Bearbeiten von Werkstücken;
• 2 ausschnittsweise eine schematische Perspektivansicht des Bearbeitungswerkzeugs; und
• 3 eine schematische Darstellung eines insbesondere hydraulischen oder pneumatischen Schaltplans zur Veranschaulichung des Bearbeitungswerkzeugs.

Further details of the invention result from the following description of a preferred exemplary embodiment with the associated drawings. It shows:

• 1 a schematic and perspective top view of a machining tool according to the invention for machining workpieces;
• 2nd sections of a schematic perspective view of the machining tool; and
• 3rd is a schematic representation of a particular hydraulic or pneumatic circuit diagram to illustrate the machining tool.

In the figures, identical or functionally identical elements are provided with the same reference symbols.

1 shows a schematic and perspective top view of a processing tool 1 for machining workpieces. The editing tool 1 is, for example, part of a processing plant, in particular a pressing plant, which is used in the manufacture of vehicles, in particular motor vehicles. This means that by means of the processing unit and thus by means of the processing tool 1 Components are made, from which the aforementioned vehicles are manufactured or assembled. The respective component is produced, for example, from the previously mentioned workpiece by the workpiece using the machining tool 1 or is processed by means of the processing plant. Using the editing tool 1 the respective workpiece is processed, for example, in such a way that the respective workpiece is formed. In particular, the respective workpiece is made using the machining tool 1 processed in such a way that the respective workpiece is cut up. Here, at least a first part of the workpiece is cut off, in particular cut, from at least one remaining, second part of the workpiece. For example, while the second part is further processed by means of the processing plant in order to produce the respective component from the second part, the first part is, for example, waste, in particular scrap. The waste is discharged from the processing plant and is not processed further by means of the processing plant. For this purpose, the processing tool includes 1 at least one or more, for example, waste openings designed as through openings 2nd , which are also called scrap openings. The waste, also known as scrap, goes through the waste openings 2nd passed through or guided through and thereby, for example via a respective one, to the waste opening 2nd subsequent waste funnel 3rd , fed to a waste container, not shown in the figures. Means the waste container, the waste is collected and collected, especially until the waste container is full. Then the waste container from the machining tool 1 transported away, and the waste is, for example, fed to a recycling process, also known as a recycling process.

To avoid objects from the waste openings 2nd can undesirably penetrate is the respective waste opening 2nd a respective waste flap 4th assigned. The respective waste flap 4th is also known as a scrap hatch. The respective scrap flap is, in particular to the respective waste funnel 3rd , between at least a partial area of the waste openings 2nd closing closed position and at least one releasing the partial area and in 1 shown open position movable, in particular pivotable. In addition, especially per waste flap 4th , one in 1 and 3rd particularly schematically shown and in the present case designed as a feed line 5 provided, which can be flowed through by a fluid. The fluid is or becomes a movement of the respective waste flap 4th feasible or effected.

Together with 2nd is particularly well recognizable that the respective waste flap 4th at least one actuator 6 is assigned, by means of which the respective, assigned waste flap 4th is movable. In particular, the waste flap 4th by means of the actuating device 6 are moved from the closed position into the open position and are held in the open position, in particular, for example, as long as the actuating device 6 over the line 5 is supplied with the fluid or as in the line 5 there is sufficient pressure of the fluid. Will that over the line 5 supply of the actuator 6 with the fluid ends or sinks in the line 5 prevailing pressure of the fluid below a threshold value, for example, one takes place, in particular pure, by the mass or by the weight of the respective waste flap 4th caused movement of the waste flap 4th from the open position to the closed position. Alternatively, it is conceivable that the waste flap 4th by means of the actuating device 6 is actively moved or can be moved from the open position to the closed position. For this purpose, for example, the actuating device 6 over another, in addition to the line 5 provided line is supplied with the fluid, in particular during, for example, one via the line 5 supply of the actuator 6 with the fluid.

The actuator 6 has at least a first actuating element in the form of a housing 7 and at least a second actuating element in the form of a piston unit 8th on so that the actuator 6 is designed as a cylinder. The actuator 6 is designed as a hydraulic or pneumatic cylinder, for example, so that the waste flap 4th is moved pneumatically or hydraulically or is movable. For example, the waste flap 4th The piston unit is opened by means of the actuating device, that is to say moved from the closed position into the open position 8th out of the housing 7 extended. This is preferably done actively by the actuating device 6 over the line 5 is supplied with the fluid. In this way, for example, the piston unit 8th on a first side with the fluid, in particular directly or at least indirectly.

For example, the waste flap 4th to close, that is to say to move from the open position into the closed position, is the fluid, in particular via the line 5 , out of the housing 7 , in particular from a partially through the housing 7 and partly through the piston unit 8th limited working chamber of the cylinder, discharged. Furthermore, it can be provided that the actuating device 6 is supplied with the fluid via the aforementioned further line, so that, for example, the piston unit 8th is supplied with the fluid on a second side opposite the first side and is thereby acted upon. So around the garbage flap 4th to close, the piston unit 8th in the housing 7 retracted. Used to retract the piston unit 8th If the latter is supplied with the fluid via the further line and is thus acted upon by the fluid, the waste flap becomes 4th specifically or actively closed. Thus, for example, the aforementioned working chamber is arranged on the aforementioned first side. On the aforementioned second side, for example, a second working chamber is arranged, which partly through the piston unit and partly through the housing 7 is limited. For example, the waste flap 4th to close, the fluid is introduced into the second working chamber, in particular via the further line. The rest of the line is in 1 Not shown. The rest of the line is in 3rd shown schematically and designated 9 there. While, for example, the fluid continues through the line 9 is introduced into the second working chamber, the fluid from the first working chamber via the line 5 dissipated. For example, while on the line 5 the fluid is introduced into the first working chamber, for example, the fluid from the second working chamber via the line 9 dissipated. The administration 5 is thus regarding the opening of the waste hatch 4th a supply line, because to open the waste flap 4th , that is to move the waste flap 4th from the closed position to the open position, the fluid via or by means of the line 5 to the actuator 6 is led there. The line is regarding the closing of the waste flap 4th a supply line, because to close the waste flap 4th or to move the waste flap 4th the fluid from the open position to the closed position by means of or via the line 9 to the actuator 6 is led there. The fluid is provided, for example, from a fluid source. The fluid is preferably air and preferably compressed air.

The actuator 6 is thus for example a system, in particular a pneumatic or hydraulic system, by means of which the waste flap 4th , in particular pneumatically or hydraulically, can be moved. The system also includes the lines, for example 5 and 9 .

Now a particularly advantageous and, in particular, low-wear operation of the machining tool 1 realize and excessive downtime of the machining tool 1 The machining tool points out how to avoid 1 one in 3rd schematically shown and also referred to as a pressure cell pressure sensor 10th by means of which a pressure in the line 5 can be recorded or is recorded. The pressure sensor 10th has, for example, an optical display 11 , which can be designed, for example, as an analog or digital or electronic display. By means of the display 11 becomes by means of the pressure sensor 10th captured and in the line 5 prevailing pressure optically displayed, so that by means of the pressure sensor 10th pressure detected by a person through the display 11 can be read.

The editing tool 1 also has an in 1 particularly schematically illustrated electronic computing device 12 , which is designed, for example, as a PLC. The electronic computing device 12 is designed to at least one of the pressure sensor 10th provided and preferably electrical signal, which the by means of the pressure sensor 10th characterized detected pressure to receive and depending on the received signal a supply of the line 5 adjust with the fluid. The processing tool points to this 1 at least one electrically controllable valve element 13 on, which is simply referred to as a valve. The valve is designed, for example, as an electromagnetic valve, wherein the valve can be designed as a particularly electromagnetic 4/3-way valve or as a particularly electromagnetic 5/3-way valve, in particular with a floating middle position.

The valve element 13 can be in at least or exactly three switching states also referred to as switching positions Z1 , Z2 and Z3 are switched or switched, in particular in that the valve is electrically operated by the computing device 12 is controlled. The switching state Z1 is a first of the switching states, the switching state Z2 is a second of the switching states. The switching state Z3 is a third of the switching states. The second switching state Z2 is a blocking position, also referred to as a blocking state, in which, for example, a position via the valve element 13 the fluid is introduced into the line 5 and preferably in the line 9 is omitted. It can further be provided that in the locked state, a valve element 13 fluid flowing out of the line 5 and preferably from the line 9 is omitted. The third switching state Z3 is a release state, also referred to as the release position, in which the valve element 13 the fluid in the line 5 flows in or is introduced, in particular while the fluid via the valve element 13 from the line 9 flows out or is diverted.

The valve element 13 is thus in the third switching state Z3 switched to the waste door 5 open specifically or actively. The first switching state Z1 is, for example, a second release state, also referred to as the second release position, in which via the valve element 13 the fluid in the line 9 flows in or is initiated. In addition, in the switching state Z1 the fluid through the valve element 13 from the line 5 evacuated or discharged. Thus the valve element 13 in the switching state Z1 switched to the waste door 4th to close specifically or actively. The switching state Z2 is, for example, after the waste flap has been opened, in particular actively or specifically 4th set to the garbage flap 4th , in particular by means of the in the line 5 or pressure prevailing in the first working chamber, that is to say hold in the open position.

Furthermore, regarding the opening of the waste flap 4th the switching state Z1 be regarded as a further blocking state or a further blocking position, since in the switching state Z1 one over the valve element 13 fluid flowing into the line 5 is omitted. For example, the waste flap 4th to keep closed after closing, the valve element 13 from the switching state Z1 in the switching state Z2 switched so that, for example, the waste flap 4th by means of the line 9 and or in the second working chamber prevailing pressure is kept closed.

Around the initially closed waste flap 4th to open the valve element 13 from the switching state Z1 or from the Switching state Z2 in the switching state Z3 switched and especially so long in the switching state Z3 held until the garbage flap 4th reached their open position. After the garbage flap 4th has reached its open position, the valve element 13 for example from the switching state Z3 in the switching state Z2 switched to the waste door 4th keep open. However, if the system has an undesirable leakage, the fluid can undesirably escape from the system even though the valve element is 13 in the switching state Z2 located. As a result, the in the line 5 prevailing pressure, which corresponds, for example, in a pressure prevailing in the first working chamber or corresponds to this pressure prevailing in the first working chamber, fall below a threshold value of, for example, 60 bar. This can lead to undesirable and excessive movement of the waste door 4th lead from the open position towards their closed position.

However, now using the pressure sensor 10th the one on the line 5 prevailing pressure can be detected by means of the pressure sensor 10th detected that the pressure falls below the threshold. As a result, the computing device 12 the valve element 13 control and thereby from the switching state Z2 in the switching state Z3 switch, causing a further drop in pressure and a further closing of the waste flap 4th is avoided. In particular, the waste flap can thereby 4th are again moved fully into the open position and are held in this position. In particular, the valve element 13 so long in their switching state Z3 held until the pressure, which is generated by the pressure sensor 10th is detected, again exceeds the threshold. Then the valve element 13 for example again from the switching state Z2 in the switching state Z3 switched, in particular in that the computing device 12 the valve element 13 electrically controlled. That on opening the garbage flap 4th following switching of the valve element 13 from the switching state Z2 in the switching state Z3 is also referred to as readjustment or readjustment because there is additional fluid in the line 5 is initiated to unduly close the waste door 4th to avoid.

A period of time that is different from opening the waste door 4th and thus from switching the valve element 13 from the switching state Z3 in the switching state Z2 Consistent or uninterrupted until the switching or readjustment, that is, up to one of the switching from the switching state Z3 in the switching state Z2 switching of the valve element 13 from the switching state Z2 in the switching state Z3 extends, is also referred to as a time period. Under the feature that switching from the switching state Z2 in the switching state Z3 directly on switching from the switching state Z3 in the switching state Z2 follows, it is understood that between switching from the switching state Z3 in the switching state Z2 and switching from the switching state Z2 in the switching state Z3 no other, further switching from the switching state Z2 in the switching state Z3 or vice versa.

The time period can be recorded, for example. Depending on the length or duration of the time span, a seriousness or a degree of any leakage can be inferred. If the time period is, for example, above a first limit value and above a second limit value that is larger than the first limit value, it can be concluded that the system has no leakage. If the time period or the second limit value falls below, while the time period exceeds the first limit value, it can be concluded, for example, that the system has a slight leakage. However, if the time span falls below, for example, both the first limit value and the second limit value, a very large or serious leakage of the system can be concluded. Depending on the time span, in particular depending on its construction or length, for example by means of an in 1 output device shown particularly schematically 14 of the machining tool 1 at least one optically and / or acoustically and / or haptically perceptible warning signal are output. The warning signal is an advisory signal or an advisory message by means of which a person can be made visually and / or acoustically and / or haptically aware that the system has a leak. The advisory signal is output in particular when the time period falls below both the first limit value and the second limit value. Furthermore, for example, a further notification signal is output when the time period falls below the second limit value and thereby exceeds the first limit value.

If such a warning message is issued, piping in the system can be checked for leaks, for example. Furthermore, measurements are carried out, for example, to identify a possible defect in the actuating device 6 and / or to identify a possible defect in a hydraulically unlockable check valve. This hydraulically unlockable check valve is in 3rd recognizable and labeled there with 15. By checking the piping for leaks and by checking whether the actuator 6 and / or the check valve 15 has a defect, information can be obtained on the basis of which a repair of the machining tool 1 planning can be particularly advantageous.

If no external leakage can be determined, an internal leak, such as a defective seal or the like, is inferred, for example, and it is then possible to control the system permanently using a maintenance key. The valve element is located due to the permanent activation 13 for example in the switching state Z3 even if the waste flap is open 4th is permanently in its open position. Due to the permanent activation, the waste flap, for example 4th in spite of the leak are kept permanently open so that, for example, a repair can be carried out at favorable times such as on the weekend.

An error is explained below by way of example: At least one of the scrap flaps is eliminated during production. If there is no warning or error message, a maintenance engineer can concentrate on the sensors or on the line chokes and, as a source of errors, can rule out leaks in pipes, defective cylinders or a defective hydraulic or pneumatically unlockable check valve. As a result, repair and thus downtimes of the processing tool can occur 1 be kept particularly low.

Out 3rd it can be seen that the system is also an example in the line 5 arranged check valve 16 has, which in the direction of the actuator 6 opens and towards the valve element 13 closes and thus in the direction of flow of the line 5 flowing through and thus from or fluid source to the actuator 6 flowing fluid downstream of the valve element 13 and upstream of the actuator 6 is arranged. The system also includes a line 9 arranged check valve 17th , which is in the flow direction of the line 9 flowing and thereby from the fluid source to the actuator 6 flowing fluid downstream of the valve element 13 and upstream of the actuator 6 is arranged. Also the check valve 17th open towards the actuator 6 and closes in the direction of the valve element 13 . The system also has measuring connections 18th and 19th on, the pressure sensor 10th on the measurement connection 18th connected and thus for example via the measuring connection 18th fluid with the line 5 connected is. This allows the pressure sensor 10th via the measuring connection 18th the pressure in the line 5 measure or record. The system also includes an adjustable sequence valve 20th , which is also referred to as an adjustable connecting valve.

Reference symbol list

1

Editing tool

2nd

Waste opening

3rd

Waste funnel

4th

Waste flap

5

management

6

Actuator

7

casing

8th

Piston unit

9

management

10th

Pressure sensor

11

optical display

12

electronic computing device

13

Valve element

14

Dispenser

15

check valve

16

check valve

17th

check valve

18th

Measuring connection

19th

Measuring connection

20th

Sequence valve

Z1

Switching state

Z2

Switching state

Z3

Switching state

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• EP 2882558 B1 [0006]
• EP 3090846 B1 [0007]
• EP 2242029 A1 [0007]

Claims (10)

Processing tool (1) for processing workpieces, with at least one waste opening (2) for waste resulting from the processing, with at least one waste flap (4) assigned to the waste opening (2), which closes a closed position between at least a portion of the waste opening (2) and at least one open position releasing the partial area is movable, and with at least one line (5) through which a fluid can flow, by means of which a movement of the waste flap (4) can be effected, characterized by at least one pressure sensor (10), by means of which a Pressure in the line (5) can be detected. Machining tool (1) after Claim 1 , characterized by at least one actuating device (6) which has at least one first actuating element (7) and at least one second actuating element (8) which can be acted upon by the fluid and thereby can be moved relative to the first actuating element (7), in particular translationally, whereby the waste flap (4) can be moved by means of the second actuating element (8), the line (5) being designed as a feed line, by means of which the fluid to the second actuating element () for moving the waste flap (4) from the closed position into the open position ( 8) is feasible. Machining tool (1) after Claim 1 or 2nd , characterized by an electronic computing device (12) which is designed to receive a signal provided by the pressure sensor (10) and characterizing the pressure detected by the pressure sensor (10) and, depending on the received signal, a supply of the line (5 ) with the fluid. Machining tool (1) after Claim 3 , characterized by at least one electrically controllable valve element (13), the electronic computing device (12) being designed to electrically control the valve element (13) in dependence on the received signal, whereby the valve element (13) between switching states (Z1, Z2, Z3) switchable and thereby the supply of the line (5) with the fluid is adjustable. Method for operating a processing tool (1) for processing workpieces, in which at least one waste flap (4), which is assigned to a waste opening (2) for waste resulting from the processing, between a closed position and at least a partial area of the waste opening (2) at least one open position releasing the partial area is moved by means of a fluid flowing through a line (5), characterized in that a pressure in the line (5) is detected by means of at least one pressure sensor (10). Procedure according to Claim 5 , characterized by an electronic computing device (12) which receives a signal provided by the pressure sensor (10) and characterizes the pressure detected by the pressure sensor (10) and adjusts the supply of the line (5) with the fluid as a function of the received signal . Procedure according to Claim 6 , characterized by at least one electrically controllable valve element (13), the electronic computing device (12) electrically actuating the valve element (13) as a function of the received signal, as a result of which the valve element (13) switches between switching states (Z1, Z2, Z3) and thereby the supply of the line (5) with the fluid is stopped. Procedure according to Claim 7 , characterized in that: - in a first step of the method, the computing device (12) electrically actuates the valve element (13), thereby moving the valve element (13) out of a blocking position (Z1, Z2) in which the valve element (13) over the valve element (13) prevents the fluid from flowing into the line (5), is moved into a release position (Z3) in which the fluid flows into the line (5) via the valve element (13), as a result of which the waste flap (4) is moved to the open position; - In a second step of the method following the first step, the computing device (12) electrically controls the valve element (13), as a result of which the valve element (13) is moved from the release position (Z3) into the blocking position (Z1, Z2); - During a third step following the second step, the valve element (13) remains in its blocking position (Z1, Z2) resulting from the second step and the pressure in the line (5) is detected by the pressure sensor (10) and is thereby monitored ; and - in a fourth step following the third step, the computing device (12) electrically actuates the valve element (13) as a function of the pressure detected during the third step, whereby the valve element (13) moves from the blocking position (Z1, Z2) into the Release position (Z3) is moved. Procedure according to Claim 8 , characterized in that during the second step and during the third step there is no activation of the valve element (13) by the computing device (12) and / or the waste flap (4) by means of the fluid which flows into the line (5) in the first step was held in the open position. Procedure according to Claim 8 or 9 , characterized in that, depending on a time period which lies between the second step and the fourth step, at least one optical and / or acoustic and / or haptic information signal is output by means of the electronic computing device (12).

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