DE102015224778B4 - Pressure pin of a press and press with pressure pin - Google Patents

Abstract

Pressure bolt (1) of a press (100), in particular a forming press, for transmitting a force to a tool component of the press (100), comprising- a bolt body (2), - a sensor element (3) for measuring a process variable, and (4), which is designed in such a way that it generates electrical energy for supplying energy to the sensor element (3) from a movement of the bolt body (2).

Description

A pressure bolt of a press is specified, which is designed to transmit a force to a tool component of the press. The press can be, for example, a forming press. Furthermore, a press with at least one such pressure bolt is specified.

The pamphlet DE 41 12 656 A1 describes a drawing device in a press for drawing shaped sheet metal parts, which has pressure pins which are provided with force sensors.

In the pamphlet DE 37 35 581 C1 describes a press for pulling sheet metal parts, which has a plurality of pressure pins, to each of which a strain gauge is glued.

The pamphlet DE 10 2012 013 371 A1 describes a measuring device for a ram cushion of a press, which comprises a plurality of pressure pins with force sensors.

A disadvantage of the solutions shown in the prior art is that the energy supply for the force sensors attached to the pressure bolts of the press is extremely complex and expensive.

Thus, it is an object to be solved at least some embodiments to specify a pressure bolt of a press, by means of which the disadvantages of the prior art can be eliminated.

This object is achieved by an object according to the independent patent claim. Advantageous embodiments and developments of the subject matter are furthermore evident from the dependent patent claims, the following description and from the drawings.

According to one embodiment, the pressure bolt described here has a bolt body, a sensor element and a power generation unit. The pressure bolt is preferably designed to transmit a force to a tool component of a press, for example to transmit a force to a sheet metal holder of a forming press. The power transmission can take place directly on the tool component or indirectly via further elements on the tool component. The bolt body of the pressure bolt preferably has a metal or consists of a metal. For example, the bolt body can have steel or consist of steel.

The sensor element is preferably designed to measure a process variable. The process variable can in particular be a process variable in relation to the pressure bolt. For example, the sensor element can be designed to measure a force which is transmitted or can be transmitted via the pressure bolt or the bolt body of the pressure bolt. The sensor element can be a force sensor, for example. For example, the sensor element can have one or more strain gauges. Furthermore, the sensor element can be part of a so-called load cell.

The energy generation unit is preferably designed in such a way that it generates electrical energy for supplying energy to the sensor element from a movement of the bolt body. The term “movement” can include any translational movement as well as, for example, any vibration movement or any deformation of the bolt body. By means of the energy generation unit, an energy self-sufficient system can advantageously be provided which does not require an external power supply and does not require complex cabling of the sensor element.

According to a further embodiment, the sensor element is designed to measure an acceleration of the pressure bolt. The sensor element can thus be an acceleration sensor, for example a piezoelectric acceleration sensor.

According to a further embodiment, the sensor element is designed to measure a temperature of the pressure bolt. The sensor element can therefore be a temperature sensor, such as an NTC sensor element, which can also be referred to as an NTC thermistor.

According to a further embodiment, the sensor element is designed to measure a bending of the pressure bolt and / or to measure a rotation of the pressure bolt. The sensor element can, for example, have one or more strain gauges.

According to a further embodiment, the sensor element is arranged on the bolt body of the pressure bolt. For example, the sensor element can be fastened flat on the bolt body and be in direct contact with the bolt body. It is also possible for the sensor element to be arranged in a recess in the bolt body.

According to a further embodiment, the sensor element is integrated in the bolt body of the pressure bolt. For example, the sensor element inside, for example in a recess, of the Be arranged bolt body and be completely surrounded by the bolt body.

According to a further embodiment, the power generation unit is arranged on the bolt body of the pressure bolt. The energy generating unit can, for example, be fastened flat on the bolt body and be in direct contact with the bolt body. Furthermore, it is conceivable that the power generation unit is fastened on the bolt body in a recess in the bolt body.

According to a further embodiment, the power generation unit is integrated in the bolt body of the pressure bolt. The energy generating unit can for example be arranged inside, for example in a recess, of the bolt body and completely surrounded by the bolt body.

According to a further embodiment, the pressure bolt has a plurality of sensor elements for measuring the force transmitted or transferable via the pressure bolt. The individual sensor elements can each be designed like the previously described sensor element.

According to a further embodiment, the pressure bolt has a radio module for transmitting sensor signals from the sensor element to a receiving unit, in particular to an external receiving unit. The radio module can for example be arranged on the bolt body or integrated into the bolt body. The energy generation unit can be designed, for example, to supply the radio module with the required electrical energy.

According to a further embodiment, the sensor element is connected to the energy generation unit and / or the radio module by means of an electrically conductive connection. The electrically conductive connection can be implemented, for example, by connecting wires.

According to a further embodiment, the energy generation unit has at least one piezo element, by means of which mechanical energy from the movement of the bolt body is converted into electrical energy.

According to a preferred embodiment, the energy generation unit can have a plurality of piezo elements.

According to a further embodiment, the pressure bolt is designed as an intermediate bolt of a press tool of a press. The intermediate bolt can in particular be designed in such a way that it can directly contact a sheet metal holder of a press tool and transmit force to the sheet metal holder.

According to a further embodiment, the pressure bolt is designed as a press quill of a press table of a press. The press quill can in particular be designed in such a way that it can apply force to a tool component of a press, in particular to a sheet metal holder of a press, via an intermediate bolt.

According to a further embodiment, the pressure pin is designed as a pressure pin of a press ram of a press.

According to a further embodiment, the pressure bolt has a modular structure. For example, the pressure bolt can be designed to be variable in terms of its length. As a result, the pressure bolt can be used, for example, in a plurality of different press tools. Furthermore, it is possible that the energy generation unit is designed as a load cell, which is removable from the bolt body of the pressure bolt and is therefore designed to be exchangeable. This means that the load cell can easily be replaced in the event of a defect or wear. Furthermore, the pressure bolt is preferably designed in such a way that it can be removed from the press tool or from the press table.

Furthermore, a press with at least one pressure pin described here is specified. The pressure pin of the press can have one or more features of the embodiments described so far. The press has a press table and a press tool connected to the press table. For example, the press can be designed as a forming press or as a punching press. Furthermore, the press has at least one pressure bolt which can be arranged at least partially in the press table or at least partially in the press tool. The press preferably has a multiplicity of pressure bolts described here, each having at least one energy generation unit, which can be arranged in the press tool and / or in the press table of the press. An online measurement can preferably take place during a pressing process by means of the sensor element or by means of the sensor elements. Particularly preferably, all pressure bolts of the press tool and / or all pressure bolts of the press table can be designed like a pressure bolt described here with a sensor element and a power generation unit. As a result, force shunts can advantageously be avoided.

According to a further embodiment, the press has a plurality of first Pressure bolts, which are each arranged in the press tool of the press on. Furthermore, the press has a plurality of second pressure bolts, which are each arranged in the press table of the press. The first and the second pressure bolts can each be designed like a pressure bolt described here according to the aforementioned embodiments and in particular each have a sensor element and an energy generating unit for supplying energy to a sensor element.

According to a further embodiment, the press has a press ram, the pressure pin or bolts being arranged at least partially in the press ram.

According to a further embodiment, the press has a receiving unit which is designed to receive signals transmitted by the radio module or by the radio modules. The receiving unit can be, for example, a central data acquisition unit which can receive signals or data from a large number of radio modules.

The press described here has a number of advantages. For example, the effort involved in the initial training of a tool on the press is significantly reduced. An improvement in the control of the blank holder is also possible. A locally resolved long-term analysis of the process and a monitoring of the wear of individual pressure bolts or the sheet metal holder are also made possible. The energy self-sufficient system enables low-cost measurement, since a technically complex external power supply for the sensor elements or the radio modules is not required.

• 1 eine schematische Ansicht einer Presse mit einer Mehrzahl von hier beschriebenen Druckbolzen gemäß einem Ausführungsbeispiel, und
• 2 eine schematische Ansicht einer Presse mit einer Mehrzahl von hier beschriebenen Druckbolzen gemäß einem weiteren Ausführungsbeispiel.

Further advantages and advantageous embodiments of the pressure bolt described here or the press described here result from the following in connection with the 1 and 2 described embodiments. Show it:

• 1 a schematic view of a press with a plurality of pressure bolts described here according to an embodiment, and
• 2 a schematic view of a press with a plurality of pressure bolts described here according to a further embodiment.

In the exemplary embodiments and figures, identical or identically acting components can each be provided with the same reference symbols. The elements shown and their proportions to one another are fundamentally not to be regarded as true to scale. Rather, individual elements can be shown exaggeratedly thick or with large dimensions for better illustration and / or for better understanding.

The 1 shows a schematic view of a press described here 100 according to a first embodiment. The press 100 is designed as a forming press and has a press table 7th and a press tool 8th on. In the press table 7th is a wide variety of press quills 12th integrated, which are designed to apply a force from hydraulic cylinders (not shown) of the press to pressure bolts 1 , which are designed as intermediate bolts and in the press tool 8th are integrated. The pressure bolts designed as intermediate bolts 1 in turn are used to transmit power to a blank holder (not shown) of the press tool 8th educated.

The one in the press tool 8th arranged pressure bolts 1 each have a bolt body 2 , a sensor element 3 to measure the over the pressure pin 1 transmitted power, a power generation unit 4th and a radio module 5 on. The power generation units 4th are designed in such a way that they consist of a movement of the bolt body 2 the push pin 1 electrical energy for supplying energy to the sensor elements 3 produce. Furthermore, the pressure bolts 1 one radio module each 5 for the transmission of the sensor signals of the sensor elements 3 to an external receiving unit 6th on. Advantageously, in the press shown here 100 complex wiring of the pressure bolts 1 or the sensor elements 3 and the radio modules 5 omitted.

In the 2 Figure 3 is a schematic view of a press described herein 100 shown according to a second embodiment. The press 100 is in turn designed as a forming press and has a press table 7th and a press tool 8th on. In contrast to that in the 1 The embodiment shown are the intermediate bolts 11 designed as an ordinary pressure bolt. The one in the press table 7th integrated pressure bolts designed as press quills 1 each have a sensor element 3 to measure the over the pressure pin 1 transmitted power, a power generation unit 4th for supplying energy to the sensor elements 3 and a radio module 5 for transmitting the sensor signals of the sensor elements 3 to an external receiving unit 6th on. Advantageously, the press 100 in combination with a variety of conventional press tools 8th can be used.

The features described in the exemplary embodiments shown can also be combined with one another in accordance with further exemplary embodiments. Alternatively or additionally, the exemplary embodiments shown in the figures can have further features in accordance with the embodiments of the general description.

List of reference symbols

1

Push pin

11

Intermediate bolt

12th

Press quill

2

Bolt body

3

Sensor element

4th

Power generation unit

5

Radio module

6th

Receiving unit

7th

Press table

8th

Press tool

100

Press

Claims (18)

Having pressure bolts (1) of a press (100), in particular of a forming press, for transmitting a force to a tool component of the press (100) - a bolt body (2), - A sensor element (3) for measuring a process variable, and - An energy generation unit (4) which is designed in such a way that it generates electrical energy for supplying energy to the sensor element (3) from a movement of the bolt body (2). Pressure bolt after Claim 1 wherein the sensor element (3) is designed to measure a force transmitted via the pressure pin (1) and / or to measure an acceleration of the pressure pin (1). Pressure bolt according to one of the preceding claims, wherein the sensor element (3) is designed to measure a temperature of the pressure bolt (1). Pressure pin according to one of the preceding claims, wherein the sensor element (3) is designed to measure a bending of the pressure pin (1) and / or to measure a rotation of the pressure pin (1). Pressure bolt according to one of the preceding claims, wherein the sensor element (3) and / or the energy generating unit (4) is arranged on the bolt body (2). Pressure bolt according to one of the preceding claims, wherein the sensor element (3) and / or the energy generating unit (4) is integrated in the bolt body (2). Pressure bolt according to one of the preceding claims, having a radio module (5) for transmitting sensor signals from the sensor element (3) to a receiving unit (6). Pressure bolt according to one of the preceding claims, wherein the energy generating unit (4) has at least one piezo element, by means of which mechanical energy from the movement of the bolt body is converted into electrical energy. Pressure bolt according to one of the preceding claims, wherein the pressure bolt (1) is designed as an intermediate bolt (11) of a press tool (8). Push pin after a Claims 1 to 8th , wherein the pressure bolt (1) is designed as a press quill (12) of a press table (7). Push pin after a Claims 1 to 8th , wherein the pressure pin (1) is designed as a pressure pin of a press ram of a press. Pressure bolt according to one of the preceding claims, wherein the pressure bolt (1) is designed to transmit a force to a sheet metal holder of a press tool (8). Pressure bolt according to one of the preceding claims, wherein the pressure bolt (1) has a modular structure, in particular its length is variable. Having a press (100), in particular a forming press - a press table (7), - a press tool (8), and - At least one pressure bolt (1) according to one of the preceding claims. Press after Claim 14 , wherein the pressure bolt (1) is at least partially arranged in the press table (7). Press after Claim 14 , wherein the pressure bolt (1) is at least partially arranged in the press tool (8). Press after Claim 14 , wherein the press has a press ram, and the pressure pin (1) is at least partially arranged in the press ram. Press after one of the Claims 14 to 17th , comprising a plurality of pressure bolts (1) according to one Claims 1 to 13th .

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