CN104550619B

CN104550619B - Rivet setting device with automatic rivet core guiding mechanism

Info

Publication number: CN104550619B
Application number: CN201410580500.7A
Authority: CN
Inventors: A.沙尔芬贝格; D.伊韦尔
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2013-10-28
Filing date: 2014-10-27
Publication date: 2020-02-07
Anticipated expiration: 2034-10-27
Also published as: DE102013221789A1; CN104550619A; SE1451250A1; DE102013221789B4; SE540172C2

Abstract

Currently, the rivet core, which is separated from the riveting tool, must be guided into the rivet core container by the operator of the riveting tool by means of a suitable movement of the rivet setting tool. The invention automates this process and thus ensures a precise and process-reliable operation of the riveting tool. This reduces malfunctions and reduces cycle time when using the appliance.

Description

Rivet setting device with automatic rivet core guiding mechanism

Technical Field

The present invention relates to a rivet setting tool or rivet sleeve or rivet attachment for industrial purposes.

Background

Rivet setting devices or systems made of them are known from the prior art.

These systems are generally implemented by means of: a higher level controller for one or more rivet setting implements (e.g., a base station, a rivet controller), a power component that is dependent on a demand for power output of the rivet setting implement, one or more rivet setting implements. The rivet setting device generally comprises at least one pulling device for pulling the rivet mandrel, which pulling device is realized by means of a drive (pneumatically, hydraulically, electrically), wherein a transmission mechanism can preferably be arranged between the drive and the pulling device.

The document EP 0653259B 1 discloses a method and a device for setting blind rivets, in which a pulling force is generated by means of an electric motor, after the blind rivet has been set, the separated rivet core must be transported away from the tool head in order to be able to carry out the next setting operation, the removal of the rivet core is currently carried out manually by gravity during the removal of the riveting tool from the workpiece to be machined by the worker, while the next blind rivet is positioned in a nozzle piece (Mundst ü ck) on the tool head, during which the separated rivet core slides by gravity along a rivet core discharge channel comprised by the riveting tool into a rivet core container.

Disclosure of Invention

The invention provides a riveting tool, by which automatic and reliable guiding-out of separated rivet cores after the installation process can be ensured.

To this end, the invention provides a riveting tool having a tool head, a mechanism for gripping a rivet core, a pulling device for pulling the rivet core, and a rivet core lead-out channel.

According to the invention, the riveting tool comprises means for generating a positive or negative overpressure relative to the air pressure.

The mentioned devices can for example operate according to the principle of an air pump or a vacuum pump. It ensures that the separated rivet core is automatically and reliably discharged after the mounting process in such a way that a positive or negative overpressure is generated inside the rivet core discharge channel after the mounting process.

By means of this positive or negative overpressure, the detached rivet mandrel, which is placed in the rivet mandrel discharge channel after detachment, is automatically discharged from the rivet mandrel discharge channel. This process is performed without depending on the current position of the riveting tool. The riveting tool itself can be a riveting tool designed for manual operation or a rivet socket (Nietaufsatz) for a tool, in particular a screwing tool. The riveting tool or rivet socket can be operated by means of a battery, a battery pack or a power supply line.

The device is preferably embodied such that the positive or negative overpressure can be generated by means of a mechanical movement of the pulling device. The movements of the internal components of the riveting tool which occur in any case during operation can thus be used meaningfully and no external devices are required for generating a positive or negative overpressure. The joint for such a device on the appliance itself is likewise dispensed with.

Alternatively, the positive or negative overpressure can also be generated by means of an electrical pump integrated into the riveting tool, which is operated by means of a power supply integrated into the riveting tool or an external power supply.

The volume flow and/or the pressure to be used for removing the rivet core is preferably controlled and/or deflected as required by means of internal valves and/or nozzles.

In a preferred embodiment of the riveting tool, the means are realized according to the principle of a piston pump, which comprises a cavity and a piston, which is movable inside the cavity by means of the pulling device. Such a mechanical structure can be easily integrated into the housing of the riveting tool, since existing cavities can be used without this having a negative effect on the installation space of the riveting tool. In addition to this, the required components are available on the market inexpensively.

In this embodiment, the cavity is designed such that a single piston stroke is used to provide the volume flow required for removing the rivet core. This ensures that there is always sufficient positive or negative overpressure in the cavity to be able to reliably remove the rivet core after each mounting operation.

Preferably, a first air duct with an air outlet opening is provided between the tool head and the cavity, which first air duct terminates at the tool head, so that a volume flow out of the air duct can be at least partially introduced into the rivet mandrel discharge duct, and the rivet mandrel discharge duct forms a second air duct. The principle of using an air pump is considered here. A volume flow is generated by means of the piston and the cavity, which volume flow is conducted to the tool head and into the rivet mandrel discharge channel. The volume flow conveys the separated rivet mandrel through the rivet mandrel outlet channel into a rivet mandrel receptacle which is preferably also comprised by the riveting tool.

In particular, it is preferred that a valve or a nozzle can be provided for influencing the volume flow. The flow rate necessary for transporting away the separated rivet core can thus be adapted as required to the properties (size, weight, material) of the rivet used.

In order to reduce the installation space, the cavity, the piston and the exhaust opening are structurally arranged coaxially with the rivet mandrel discharge channel, so that the rivet mandrel discharge channel extends along the central axis of the entire system. The rivet mandrel lead-out channel preferably also extends from the tool head along the same axis along which a rivet mandrel lead-through and a trapezoidal or ball screw (Trapez-undKugelumlaufspindel) with a rivet mandrel lead-through are included in the riveting tool.

It is particularly preferred that the riveting tool is a tool which is suitable for manual operation and is preferably designed for battery operation or a rivet socket which is intended for a tool which is suitable for driving the rivet socket. The riveting tool can thus be used easily during the manufacture of the vehicle body, since it can also be used in a use position which is difficult to access.

The invention also comprises a method for setting a blind rivet or blind nut consisting of a rivet sleeve and a detachable rivet core by means of a riveting tool, wherein the riveting tool comprises: a tool head (10) in which means are provided for gripping the rivet core; a pulling device (7) for pulling the rivet core; and a rivet mandrel discharge channel (34) which extends from the tool head (10).

In this case, a positive or negative overpressure is generated with respect to the air pressure by means of a device additionally included by the riveting tool, by means of which, using the rivet core outlet channel, the separated rivet core present after the mounting process is transported away from the tool head by blowing out or suction.

The positive or negative overpressure is generated by means of a mechanical movement of the pulling device (7). The device is preferably constructed according to the principle of a piston pump, which comprises a cavity and a piston, which is moved inside the cavity by means of the pulling device.

The advantages obtained from this method are in accordance with the advantages obtained from the riveting tool according to the invention.

Drawings

Fig. 1 shows a possible configuration of the riveting tool (blind rivet tool);

fig. 2 shows a possible configuration of the rivet socket (blind rivet attachment); and is

Fig. 3 shows a rough schematic representation of the device for generating a positive/negative overpressure.

Detailed Description

The riveting tool shown in fig. 1 is used for setting blind rivets or blind nuts, which are composed of a rivet sleeve and a detachable rivet core. The present invention relates to a battery-operated device for manual operation. An appliance head 10 having a nosepiece for holding the rivet core is provided. Along the same axis 13, the tool head 10 and/or the force sensor with the rivet core feed-through 9 and/or the trapezoidal or ball screw 7 with the rivet core feed-through and/or preferably the rivet core container 12 are arranged next to one another. The rivet mandrel, which is gripped by the die during operation, can be guided through the

aforementioned assemblies

10, 9, 7 after separation thereof, by means of a rivet mandrel discharge channel (not shown) up to the rivet mandrel receptacle 12.

The trapezoidal or ball screw 7 is driven by means of an electric motor 5, preferably in conjunction with a gear 6, if necessary with an offset (Versatz). A stroke sensor 8 is arranged on the trapezoidal screw or ball screw 7, which is able to detect the stroke traveled by the trapezoidal screw or ball screw 7 directly or indirectly by means of the angle of rotation traveled by the trapezoidal screw or ball screw 7. Alternatively, the travel sensor 8 can also be arranged on the electric motor or motor 5 and detect its rotation angle.

Reference numeral 11 denotes control electronics with a communication module and a display inside the appliance, which control electronics can also be at least partially enclosed by the housing of the riveting tool. The rivet core container 12 can also be at least partially enclosed only by this housing.

The entire system mentioned above is supplied with power by means of the accumulator 1, for which purpose a cable harness 3 is provided, which extends inside the riveting tool. The starting switch 4 is used to switch the riveting tool on and off. Reference numeral 2 denotes an interface with power electronics for operating the motor 5.

At least the

components

2, 3, 5, 6, 7, 8, 9 are completely enclosed by the housing of the riveting tool, and preferably also the control electronics 11. The control electronics 11 can control the rivet setting process completely autonomously and process-reliably without a superordinate controller, in that they record and evaluate the rivet setting process carried out by means of the sensors 8, 9 present in the riveting tool for force and travel detection.

The control electronics 11 are equipped with a data memory and are connected to the sensors 8, 9 in such a way that they can store in the data memory the data quantity that is continuously provided by the sensors during the installation process.

The riveting tool according to the invention preferably comprises a radio module 14, preferably a WLAN (wireless local area network) module and/or a mobile radio module (GSM/G3/G4), for the wireless transmission of process data or stored data to an optionally connectable superordinate controller 15.

The two modules can also be optionally activated, for example, depending on the signal quality and the connection to the data network. "process data" means a continuous data stream which is generated during the installation of blind rivets or blind nuts by means of the force and travel sensor devices 8, 9 and which therefore represents the characteristic data (force-travel data) for the particular installation process.

The quality analysis can be carried out using the reference data set, which is also in the form of force/travel data, either by means of the control electronics 11 and/or by means of the superordinate controller 15. In addition to the simple OK/NOK information (NOK = no), the display of the integrated appliance control electronics 11 can also display the force/travel curve or the analysis results related thereto to the user. The superordinate device uses an external display for this purpose.

Such an analysis allows the force-travel diagram of any single riveting process to be evaluated afterwards, which is carried out inside the production line. Extensive quality analysis can thus be carried out with respect to the processed rivet.

The riveting tool comprises the device 16 according to the invention for generating a positive or negative overpressure relative to the air pressure inside the rivet mandrel discharge channel (not shown).

The detached rivet mandrel can be guided into the rivet mandrel receptacle 12 by positive or negative overpressure fully automatically by means of the components of the riveting tool arranged adjacent to one another along the axis 13, for example the tool head 10 and the force sensor with rivet mandrel feed-through 9 and the trapezoidal or ball screw 7 with rivet mandrel feed-through.

The rivet sleeve or rivet attachment shown in fig. 2 is used for mounting a blind rivet or blind nut composed of a rivet sleeve and a detachable rivet mandrel and is enclosed by a housing 214.

An implement head 210 having a nosepiece for holding the rivet core is also provided. Along the axis 213, the tool head 210 and/or the force sensor with the rivet core feed-through 29 and/or the trapezoidal or annular rotary screw 27 with the rivet core feed-through and/or preferably the rivet core receptacle 212 are arranged next to one another. The rivet core held by the die piece during the setting process can thus be guided after its separation through the

aforementioned assemblies

210, 29, 27 to the rivet core receptacle 212.

The trapezoidal screw or ball screw 27 can be driven by means of the motor coupling 25, preferably in conjunction with the gear 26, if necessary with an offset. A travel sensor 28 is arranged on the trapezoidal screw or ball screw 27, which is able to detect the travel traveled by the trapezoidal screw or ball screw 27 directly or indirectly by means of the angle of rotation traveled by the trapezoidal screw or ball screw 27. Alternatively, the travel sensor 28 can also be arranged on the gear mechanism 26 and detect the angle of rotation there.

Reference numeral 211 denotes control electronics with a communication module and a display, which can also be at least partially enclosed by the housing 214. Alternatively, the control electronics can be electronics for detecting measured values and/or for analyzing and evaluating the detected measured values. However, it can also be an electronic interface which can connect an electronic device installed in the rivet socket to an external electronic device, for example to an electronic device of a screwing tool with which the rivet socket can be operated. The rivet core receptacle 212 can also be at least partially surrounded by the housing 214.

The electronics or control electronics 211 are preferably equipped with a data memory and are connected to the

sensors

28, 29 in such a way that the electronics 211 can store and/or analyze the data quantity continuously provided by the sensors during the rivet setting process in the data memory.

The rivet socket according to the invention preferably comprises a radio module 216, for example a WLAN module and/or a mobile radio module (GSM/G3/G4), for wirelessly transmitting riveting process data or stored data to a superordinate controller. The data can also be transmitted by means of the interface 215 in a wired manner, for example to a drive-use screwing tool screwing process controller. The WLAN module and/or the mobile radio module (GSM/G3/G4) 216 can also be optionally activated, for example, depending on the signal quality and the connection to the data network.

"process data" here also means a continuous data stream which is detected by means of force and travel sensor devices during the installation of blind rivets or blind nuts. These data represent characteristic data for a specific installation process, which allow, in particular, a quality analysis (force-travel data).

Such a mass analysis can also be carried out in this exemplary embodiment using a reference data set (force-travel-reference curve) either by means of the tool electronics 11 and/or by means of superordinate devices. In addition to the simple pass/fail information (NOK = fail), the display of the integrated appliance electronics 211 can thus also display the force/travel curve or the analysis results related thereto to the user. The superordinate device uses an external display for this purpose.

Such an analysis then allows the force-travel diagram of any single riveting process to be evaluated, which is carried out inside the production line. The entire system mentioned above is supplied with power by means of the electronic interface 215, which enables a connection to a tool (e.g., a screw drive) or to an external control unit (e.g., a screw drive control unit).

The rivet socket or rivet attachment comprises the inventive device 217 for generating a positive or negative overpressure relative to the air pressure inside the rivet mandrel discharge channel.

The detached rivet mandrel can be guided into the rivet mandrel receptacle 212 fully automatically by means of the positive or negative overpressure by the components of the rivet socket which are arranged adjacent to one another along the axis 13, for example the tool head 210 and the force sensor with rivet mandrel feed-through 29 and the trapezoidal or ball screw 27 with rivet mandrel feed-through.

Fig. 3 shows a schematic overview of the inventive concept, namely the cavity 31, the piston 35, the force sensor with the rivet mandrel feed-through 37, the nozzle part 32 for holding the rivet mandrel 30, and the rivet mandrel discharge channel 34, through which the separated rivet mandrel 30 can be discharged into the rivet mandrel receptacle 33.

In fig. 3 a), after the rivet core 30 has been separated from the blind rivet (not shown) by means of the tubular fitting 32, it is placed in the rivet core discharge channel 34 ready to be discharged. In fig. 3 b), a volume flow is generated by means of the piston 35 and the cavity 31. Fig. 3 c) shows how the volume flow is blown into the rivet core discharge channel 34 by means of an air channel with an air outlet 38, preferably using a valve and/or a nozzle (not shown), so that the separated rivet core 30 lying there is entrained by the volume flow and can be discharged through the rivet core discharge channel 34 into the rivet core container 33.

The arrangement of the cavity 31, the piston 35 and the air duct with the air outlet 38 coaxially with respect to the rivet core outlet duct 35 significantly reduces the installation space required for the device according to the invention inside the rivet setting device or rivet sleeve or rivet attachment. The piston 35 is connected (not shown) to the mechanism of the riveting tool in such a way that it can perform a reciprocating movement by means of the mechanism.

Claims

1. A riveting tool for setting a blind rivet or blind nut comprising a rivet sleeve and a detachable rivet mandrel, comprising:

a tool head (10) in which means are provided for gripping the rivet core;

a pulling device (7) for pulling the rivet core;

and a rivet mandrel lead-out channel (34) which is arranged from the tool head (10),

it is characterized in that the preparation method is characterized in that,

comprises a device by means of which a positive or negative overpressure relative to the air pressure can be generated inside the rivet mandrel discharge channel (34), so that a detached rivet mandrel can be transported away by means of the positive or negative overpressure;

wherein the device is realized in such a way and is connected to the pulling device (7) that the positive or negative overpressure can be generated by means of a mechanical movement of the pulling device (7);

wherein the device is designed according to the principle of a piston pump, which comprises a cavity (31) and a piston (35), wherein the piston (35) can be moved by means of the pulling device (7) within the cavity (31) or the pulling device (7) itself is designed as the piston (35), and wherein the cavity (31) is designed such that the volume flow required for removing the rivet mandrel is provided in only one piston stroke.

2. Riveting tool according to claim 1, wherein a first air channel (38) is provided between the tool head (10) and the cavity (31), so that a volume flow out of the first air channel (38) can be at least partially introduced into the rivet core outlet channel (34), wherein the rivet core outlet channel (34) forms a second channel.

3. A riveting tool as claimed in claim 1 or 2, wherein a valve or nozzle is provided for influencing the volume flow.

4. Riveting tool according to claim 2, wherein the cavity (31) and/or the piston (35) and/or the first air channel (38) with vent are arranged coaxially with the rivet core lead-out channel (34).

5. Riveting tool according to claim 1 or 2, wherein the rivet mandrel lead-out channel (34) extends from the tool head (10) along the axis (13) within the rivet mandrel feed-through (9) and the trapezoidal or ball screw (7) with the rivet mandrel feed-through and opens into the rivet mandrel receptacle (12).

6. A riveting tool as claimed in claim 1 or 2, wherein the riveting tool is a device intended for manual operation, or a rivet socket for a tool adapted to drive the rivet socket.

7. The riveting tool of claim 6 wherein the riveting tool is designed for battery operation.

8. The riveting tool of claim 6 wherein said rivet socket is adapted for use with a driver tool adapted to drive said rivet socket.

9. Method for setting a blind rivet or blind nut consisting of a rivet bush and a detachable rivet core with a riveting tool, wherein the riveting tool comprises:

an implement head (10) in which means are provided for gripping the rivet core;

a pulling device (7) for pulling the rivet core;

it is characterized in that the preparation method is characterized in that,

generating a positive or negative overpressure relative to the air pressure by means of a device additionally included by the riveting tool, by means of which the separated rivet mandrel present after the mounting process is transported away from the tool head (10) by blowing out or suction using the rivet mandrel discharge channel (34);

wherein the positive or negative overpressure is generated by means of a mechanical movement of the pulling device (7);