EP3071348A1

EP3071348A1 - Device for attaching a joining element to a component section, and tool

Info

Publication number: EP3071348A1
Application number: EP14796470.4A
Authority: EP
Inventors: Michael Badent; Roland Wendt
Original assignee: Tox Pressotechnik GmbH and Co KG
Current assignee: Tox Pressotechnik GmbH and Co KG
Priority date: 2013-11-22
Filing date: 2014-11-04
Publication date: 2016-09-28
Anticipated expiration: 2034-11-04
Also published as: WO2015074862A1; US20160279695A1; US10870145B2; CN105745037B8; CN105745037A; EP3071348B1; CN105745037B; DE102013019519A1

Abstract

Proposed is a device for attaching a joining element (2) to a component section, for a tool (1) for attaching a joining element (2) to a component section having a linearly movable die (5), by which a joining element (2) presented in a presentation position (3) can be transferred from the presentation position (3) to the component section. According to the invention, means are present for providing a pressure difference in the region of a presented joining element (2), wherein, on a presented joining element (2), the pressure difference which can be provided by the means leads to a retaining force acting on the joining element (2) so that the joining element (2) is held in a positionally fixed manner in the presentation position.

Description

Device for attaching a joining element to a

Component section and tool "

State of the art

There are devices or tools for attaching

Joining elements known on components, such as riveting tools. With such tools, joining elements such as functional elements or semi-hollow punch rivets, solid punch rivets or clinch rivets can be processed. The joining elements provided for a joining point on the component must be moved to the component before being attached to the component from a reference position on or in the tool.

Purpose and advantages of the invention

The object of the present invention is to improve devices or tools initially mentioned, in particular with regard to a space-saving and non-critical provision of joining elements on the tool

This object is solved by the independent claim.

The dependent claims relate to advantageous variants of Invention.

The invention is based on a device for attaching a joining element to a component section for a tool for attaching a joining element to a component section with a linearly movable stamp, with which a joining element presented in an initial position is removed from the component

Template position can be offset to the component section.

In particular, the invention relates to a device for a joining or riveting tool for semi-hollow punching riveting,

Solid punch rivets, clinch rivets or for processing other joining elements.

Such tools include a punch assembly with a driven linearly movable punch member or punch, usually with an outside of the punch existing

Downholder, and one opposite arranged

Die unit. Between the stamp assembly and the

Matrizeneinheit the component portion, for example, two or more layers of material made of sheet metal and / or other materials for attaching the joining element is positioned. The stamp takes from a retracted position a waiting in the original position joining element for further processing and leads the joining element up to the joining point on the component section, where it is firmly anchored to the component section to

Example is pressed.

The respective tools are often formed with a C-shaped tool part or a so-called C-bracket, which includes the punch assembly and the die unit.

As a component section, for example, sheet-like

Components are understood, for example, single or multilayer flat components. If necessary, two or more component layers can be connected to one another with the tool.

The essence of the invention is that means for

Providing a pressure difference in the range of submitted joining element are present, wherein the pressure difference provided by the means leads to a presented joining element to the fact that a holding force acts on the joining element, so that the joining element in the original position

is held fixed in position.

This advantageously holds a joining element on the device or on the tool in the original position. In particular, an arrangement is proposed which, what a free

Moving path of the punch, no critical interference contour due to holding mechanisms for the joining element has. Advantageously, for realizing the pressure difference in particular no to the original position z. B. movable approachable components or elements necessary, as is the case with known arrangements. These elements always lead to collisions with the moving stamp.

The pressure difference can also be advantageously realized in particular with a frequently existing pneumatic arrangement. Pneumatic arrangements are in rivet or

Joining tools regularly, for example, for the transport of

Joining elements of a memory or a template for a plurality of joining elements to the tool zoom needed.

It is advantageous if the joining element held with the pressure difference bears against a mechanical stop

pressed or sucked. The mechanical stop may be on a portion of an outer shape of the joining element

be matched, which comes into contact with the stop in the original position of the joining element, which supports or increases a holding function for the joining element by positive engagement or surface contact in this area of the contact additionally acting contact pressure.

The pressure difference acting on the joining element can be achieved, for example, by increasing the air pressure or reducing the pressure in the air

Close range of Fügelements be set in the template position. The pressure difference can be provided statically or dynamically or by a gas flow. Further, it is advantageous that Anströmmittel for

Provision of a directed gas flow in the region of a submitted joining element are present, wherein the gas flow flows around the joining element such that a holding force can be provided on the joining element, which holds the joining element in the original position.

The joining element is forced by the gas flow or pneumatically in the desired original position and remains there. The directed gas flow in particular causes a force acting on the pad element, such that a displacement or moving away of the joining element from the original position due to the gravity or the dead weight of the

Joining element is prevented.

The directed gas flow may in particular be directed horizontally or transversely to a vertical direction of movement of the punch. In general, a joining element with its longitudinal axis is aligned or offset parallel to the longitudinal or

Movement axis of the punch held in the original position. In this case, the punch is in a retracted position relative to the component portion, so that the joining element between the front end of the retracted punch and the component portion is held in a waiting or the original position or pickup position. The gas flow on the

Fügelement can accordingly z. B. transversely or obliquely to

Direction of movement of the punch or the longitudinal axis of the

Joining be directed to the joining element. In

Flow direction of the gas flow to and behind the

Joining or optionally laterally thereof

Advantageously, volume areas or outflow paths to

Provide effluent or diverting the gas stream.

From the template position is indicated by a linear

Forward movement of the punch, the presented joining element to the component section zoom. The stamp thereby overcomes the holding force on the joining element and takes this in front of him pushing. It is not excluded that the gas flow at the moment of reaching the original position changes its discharge path. This may for example be the case when the outflowing

Gas flow is discharged behind the Fügelement via a discharge opening, but with the reaching of the original position of the joining element, the discharge opening is closed. From this moment on, the gas flow is, for example, on the side of

Passing element passed over other discharge paths. If then the Fügelement taken away from the stamp, and the discharge opening is released again, with the next

Joining element is urged by the gas flow in the original position.

If necessary it can be arranged in that

A low pressure or negative pressure is applied to the closed discharge opening, with the result that a suppression or suction holding force acts on the joining element in the supply position in this area.

Further, it is advantageous that a wall section which is connected to one of a joining element in the original position

reachable range, is formed such that a joining element reaching the original position occupies the original position in the correct position under the action of the gas flow. The joining element is so for example via a conveyor line to the original position

transported in that the joining element already reaches the region of the original position in at least approximately positionally correct alignment. The wall portion may be tuned so that under the action of the pressure difference or the gas flow outside of the joining element this on a punctual, linear and / or planar contact with the wall section, the joining element in a desired exact

Orientation takes the template position.

Further, it is advantageous that the wall section is designed to match an outer contour of the joining element. If the wall section concerned on the corresponding

Adjusted range of the outer contour of the joining element

is configured or forms, for example, its negative form, the joining element can be brought exactly under the action of the gas flow in the desired position template, in which the portion of the outer contour of the joining element fits snugly or possibly flat against the wall portion.

It is also advantageous that the Anströmmittel

are formed, a joining element by means of the gas flow from one end of a Zuführabschnitts, with which a joining element is lead-wire to the device can be moved, to move to the initial location. The gas stream is advantageously used in addition to the holding power supply as a transport medium for the directional movement of a joining element to this of a zoom reaching to the device or the tool end of a conveyor line to the original position

transport. This is usually a relatively short distance. Advantageously, the transport of the joining elements in the conveying line also takes place pneumatically or under the action of a directed gas flow. This gas stream then serves to hold the respective joining element in the original position.

An alternative advantageous variant of the invention is characterized in that in an area in which a

Joining element assumes the original position, discharge sections for a removal of the directed gas flow are present. Thus, the gas flow can be targeted outside of the pad in the

Template position are passed, that the holding force is optimized.

The derivation section may refer to a related to

Direction of flow of the gas flow rear side of the

held joining element, for example, as at least one discharge line for the gas stream.

The flow through the gas stream is preferably carried out from the direction from which the joining element is transported via a feed line to the original position. Thus, the joining element reaches in the direction of the conveying movement

Template position. It is also advantageous that a vacuum arrangement for generating a gas negative pressure in the region of the original position is present. For example, a vacuum or

Vacuum pump may be provided which in the field of

Template position, for example, in a zoom reaching to the template position low pressure bore creates a negative pressure or sucks the existing air there. The negative pressure must be set up such that a resulting suction force acting on the joining element pulls the joining element into the original position.

The vacuum arrangement can advantageously for

Presence control of a joining element with respect to

Template position be formed. The vacuum arrangement can serve in addition to Haltef tion or alternatively to the holding function for checking whether a joining element is present or properly present at the original position. This can be done for example with an arrangement which z. Example, a sensor and / or a pressure switch for measuring a low or low pressure in a low-pressure bore, to the

Joins joining element in the template position includes. The arrangement in question can determine if there is a

Half hollow punch rivet under the stamp or in the

Template position is or not.

For example, combined with a hold function by low pressure, a presence check for a

submitted joining element can be provided.

Further, it is advantageous that an overpressure arrangement for generating a gas overpressure in the region of the original position is present. The overpressure is preferably such

set up, for example with a pneumatic arrangement, that a force acting on the joining element resulting pressure force urges the joining element in the original position. The gas overpressure is advantageous with a targeted gas flow, in particular with a continuous and / or

Constant gas flow or air flow set up. It is also advantageous that the inflow means are adapted to generate a gas flow, so that gas flows to an existing in the initial position joining element. Thus permanently the holding force esp. Can be reproducibly realized. Advantageously, an overpressure in the region of the original position can be generated via the gas flow in order to provide the desired or necessary holding force acting on the joining element. With a greater weight of the joining element, a correspondingly higher holding force

be set up as a lighter joining element, in which then possibly a comparison with the heavier joining element lower gas flow or gas pressure is sufficient under otherwise identical conditions.

It is also advantageous that the inflow means are adapted to generate a gas flow, so that gas flows away from a joining element present in the initial position. Thus, a negative pressure at the joining element can be generated with the gas flow, so that a corresponding vacuum holding force the

Permanently holds the joining element in the original position. About the height of the negative pressure, the holding force in amount and height can also be determined.

According to an advantageous embodiment of the invention, the original position along a zurücklegbaren by the stamp path between a retracted position and a in

Direction of a component portion extended position formed. Thus, the joining element is advantageously taken from the stamp at the original position.

Moreover, it is possible with an arrangement according to the invention, for example via a control unit for controlling the operation of the tool to reduce the pressure difference or thus the holding force at the original position or

to cancel if the stamp the Fügelement from the

Takes template position in the direction of the component section.

But it is also possible to permanently increase the pressure difference receive. The punch can be a much greater force than the holding force on the pad for detachment from the

Apply template position and thus detach the joining element and take it in the direction of the component section. Advantageously, the punch does not have to move to representational holding means in the vicinity of the held joining element to move towards the joining element, since no such substantive holding means exist with the pressure difference or can be dispensed with. This will be a possible

Risk of collision of the punch when collecting the inventively held by differential pressure joining element avoided.

The invention also relates to a tool for attaching a joining element to a component portion with a linearly movable punch, wherein a device according to one of the aforementioned variants is present.

figure description

Further features and advantages of the invention are based on a schematically illustrated embodiment of a

inventive tool explained in more detail. In detail shows:

Figure 1 shows a part of a tool according to the invention in

Cut along a tool axis and

FIG. 2 shows an enlarged detail from FIG. 1.

In the figures, a part of an inventive than

Riveting tool 1 trained tool for processing of joining elements, wherein exemplified as

Halbhohlstanzniet 2 designed joining element is processed. The Halbhohlstanzniet 2 is in a holding or

Template position 3 held in the riveting tool 1. The

Halbhohlstanzniet tool 1 is used to introduce the

Semi-hollow punch rivet 2 in, for example, two or more to be joined together material layers (not shown), which consist for example of a metallic or other material.

For the positioning of the semi-hollow punch rivet 2 in the

Template position 3 on the riveting tool 1 is the

Halbhohlstanzniet 2 of a remote from the actual riveting tool 1 memory for a variety of semi-hollow rivets about z. B. a feed tube (not shown) and a subsequent thereto tool side feed 6 with a

Feed channel 7 for the semi-hollow punch rivet in the direction P3 in a rivet setting head 4 of the riveting tool 1. A via a drive unit of the tool 1 according to the arrows PI and P2 linearly reciprocable as Nietsetzstift fifth

formed punch of the riveting tool 1 takes each a single Halbgohlstanzniet 2 from the original position 3 in the direction P4 and pushes the Halbhohlstanzniet 2 in a joining operation, for example, in a laminated core to bring the sheets in an at least positively connected state.

The sectional view from FIGS. 1 and 2 results from a section along the longitudinal axis of the rivet setting pin 5.

The Nietsetzstift 5 is in the extended in the direction of a not shown Matrizeneinheit the riveting tool 1 outside circumferentially of a hold-down nose. 9

surrounded by a trained hold-down. The concerned

Material layers such. B. a laminated core lie in the joining process with a bottom on a die assembly of the

Riveting tool 1, wherein the Niederhalternase 9 fixed from above or punch side pressing the laminated core.

The Halbhohlstanzniet 2 is not from the memory in

Axial direction or in the direction of the longitudinal axis L of the

Halblohlstanzniets 2 introduced into the Nietsetzkopf 4, but in the transverse direction to the longitudinal axis L of the

Halbhohlstanzniets 2 through the feed 6. So kann

Advantageously, the Halbhohlstanzniets 2 immediately below the Nietsetzstift 5 are shot, with an otherwise necessary mechanism, for example, a slider mechanism can be dispensed with, which rotates the Halbhohlstanzniet 2 by 90 degrees before the punch

Halbgohlstanzniet 2 in the direction P4 according to the orientation shown in Figures 1 and 2 with a rivet underside further advances.

The Halbhohlstanzniet 2 is conveyed by means of an air flow 8 in the direction P3 and injected directly below the Nietsetzstift 5 and its front or end-side flat end surface 5a and aligned there held positionally fixed in an original position 3, as shown in Figures 1 and 2. In this case, the Halbhohlstanzniet 2 by a corresponding to the

Air flow 8 outside the Halbhohlstanzniet 2 acting

Pressure difference recorded. So that the Halbhohlstanzniet 2 in the original position 3 feels the pressure difference is a

Exhaust line for the air present, for example, on a the incoming air flow 8 rear side of the held Halbhohlstanzniets 2. The Halbhohlstanzniet 2 is thus forced into the original position 3 and remains there as long as the air flow 8 and a pressure difference exists.

In the present embodiment is a

Low pressure bore 10 is provided in which, based on a reference pressure such as ambient or atmospheric pressure, a negative pressure or low pressure prevails. If the

Halbhohlstanzniet 2 reaches the original position 3 and closes an opening 10 a of the low-pressure bore 10, the Halbhohlstanzniet 2 due to the negative pressure in the

Low pressure bore 10 sucked to the opening 10a and

remains in the original position 3. With the negative pressure in the low-pressure bore 10 on the one hand and a higher, for example, an ambient pressure in the remaining area around the Halbhohlstanzniet 2 around, a pressure difference on

Halbhohlstanzniet 2 effective, which holds the Halbhohlstanzniet 2 in the original position. The negative pressure in the

Low pressure bore 10 may be configured, for example, by a suction or vacuum arrangement which removes air from the Low pressure hole 10 sucks.

With the invention can advantageously on an otherwise required facial expressions or arrangement for mechanically holding the Halbhohlstanzniets 2 in the original position 3 as

For example, a slide mechanism can be dispensed with.

So far it is disadvantageous that a leadership of a

Halbhohlstanzniets by a rivet setting head and its holding comparatively high demands on the reliability of the mechanism, taking into account the smallest possible

Interference contour of Nietsetzkopfes provides.

The position of the Halbhohlstanzniets 2 in Nietsetzkopf 4 must always be unique, especially at the transition of his

Direction of movement from a transverse direction of movement to below the Nietsetzstift 5 to a Axialbewegungsrichtung in which the Nietsetzstift 5 pushes the Halbhohlstanzniet 2 through the Niederhalternasenase 9. If the Halbhohlstanzniet 2 in the riveting tool 1 or in Nietsetzkopf 4 even slightly tilted or twisted, this leads in most cases to damage or destruction of components of the

Rivet setting head 4. This is where the invention begins.

For the Halbhohlstanzniet 2 according to the invention not by a holding mechanism but by a differential pressure, for example, by negative pressure in the low-pressure bore 10 or pressure from the side of the feed channel 7 ago under the

Nietsetzstift 5 held.

The transition from the lateral z. B. horizontal feeding of Halbhohlstanzniets 2 according to P3 in the further movement of the Halbhohlstanzniets 2 by the Nietsetzstift 5 takes place in a continuous path without interference contours and / or component offsets. As a result, a continuous, low-wear transport of Halbhohlstanzniets 2 in

Riveting tool 1 guaranteed.

The Halbhohlstanzniets 2 is particularly by negative pressure or excess pressure under the Nietsetzstift 5 promoted or

injected, with other possibilities, for example by gravity are conceivable.

The holding force on the Halbhohlstanzniet 2 by acting in the original position 3 suppression p leaves as soon as the Halbhohlstanzniet 2 minimal by the action of the lowering Nietsetzstiftes 5 or slightly out of

Template position 3 is pushed out. Then take on the Halbhohlstanzniet 2 coming into contact holding sections on Nietsetzkopf 4, the positioning and leadership of

Halbhohlstanzniets 2. The Halbhohlstanzniet 2 is always moved aligned aligned.

The according to P3 transverse to the direction of movement PI, P2 of the

Nietsetzstiftes 5 in the Nietsetzkopf 4 geschossenene

Halbhohlstanzniet 2 meets the investment contour 14 of a

Stop 11. The stop 11 forms opposite to the feed 7 a part of a movement channel for the

Rivet setting pin 5 in the region of the original position 3.

The stop 11 is located immediately below the

Nietsetzstift 5 in his according to the figures 1 and 2

fully retracted in the P2 direction. The shape of the wall IIa of the stop 11 is cupped with a

Radius that corresponds approximately to an outer radius of a shaft 12 of the semi-hollow punch rivet 2, which for all processable with the riveting tool different long

Semi-holed punching rivet is the same. The wall IIa is pierced and the thus formed low-pressure bore 10 is subjected to negative pressure. As a result, the semi-hollow punch rivet 2 or its shaft 12 is sucked against the wall IIa and the half-hollow punch rivet 2 is held in the feed position 3. The low-pressure bore 10 extends through the rivet setting head 4 to a suitable location, in particular in an impurity-critical area of the riveting tool 1, at the z. B. a sensor and / or a

Pressure switch by measuring the low pressure in the

Low pressure bore 10 can determine if a

Semi-hollow punch rivet under the Nietsetzstift 5 or Not. This is combined by low pressure with the

Holding function provides a presence control for a held Halblöchstanzniet 2. Thus, a plurality of, for example, several ten thousand semi-hollow punch rivets can be treated in such a way that the half-hollow punch rivet 2 in all

Space positions of Nietsetzkopfes 4 is securely sucked and that the low-pressure bore 10 is not added by abrasion.

In addition, an air filter in the low-pressure bore 10th

be provided with which the sensor of particles

is kept free, the z. B. by abrasion from the

Feed tube or the supply 6 or a coating of Halbhohlstanzniets 2 are conditional. The sensor, for example, a pressure sensor can also check in another function, whether the air filter is clogged.

Viewed in the direction of P3 is a rivet head 13 with a groove 13a in an at least almost positive engagement with the corresponding convex shaped portion of the wall IIa. Along this, the Halbhohlstanzniet 2 can be offset in the first movement section from the original position 3 from Nietsetzstift 5 in the direction P4 and at the same time slightly opposite to the direction P3 until the longitudinal axis L and the longitudinal axis S of the punch match.

In order to ensure that the Halbhohlstanzniet 2 can be moved forward by the advancing Nietsetzstift 5, the longitudinal axis of the stop 11, based on the

Stamp longitudinal axis S, slightly offset, so that the

incoming Halbhohlstanzniet 2 with the air flow 8 slightly further or over the center of a hollow punch channel 9a in the Niederhalternase 9 flies. This will be the

Halblohlstanzniet 2 slightly moved by the advancing Nietsetzstift 5 relative to the end face 5a of the Nietsetzstifts 5, and indeed back towards the feed channel 7. After the rivet head 13 has moved from its positive position on the wall IIa out, he is through the cylindrical wall of the punch channel 9a continued in the Niederhalternase 9. By the feed of Nietsetzstifts 5 is the Halbhohlstanzniet 2 automatically moved out of its positive position from the original position 3, without z. B. a mechanical lever or a snapper must be activated.

With the arrangement according to the invention is the

Halbhohlstanzniet 2 securely held in all spatial position positions of Nietsetzkopfes 4, especially in an overhead position of Nietsetzkopfes 4th

List of reference numbers:

1 riveting tool

2 semi-hollow punch rivet

3 Template position

4 rivet setting head

5 rivet setting pin

5a end face

6 feeder

7 feed channel

8 airflow

9 hold-down nose

9a stamp channel

10 low pressure drilling

10a opening

11 stop

IIa wall

12 shaft

13 rivet head

13a throat

Claims

Claims :

Anspruch [en] A device for attaching a joining element (2) to a component section for a tool (1) for attaching a joining element (2) to a component section with a linearly movable punch (5), with which one in one

Template position (3) presented joining element (2) from the

Template position (3) to the component portion is displaceable, characterized in that means for providing a pressure difference in the region of a presented joining element (2) are provided, wherein the pressure-difference can be provided with the means on a presented joining element (2) causes a holding force acts on the joining element (2), so that the joining element (2) is held fixed in position in the original position (3).

2. Apparatus according to claim 1, characterized in that inflow means for providing a directed gas stream (8) in the region of a presented joining element (2) are present, wherein the gas stream (8) flows around the joining element (2) such that a holding force on the Joining element (2) can be provided, which the joining element (2) in the

Template position (3) stops.

3. A device according to claim 1 or claim 2, characterized in that a wall portion (IIa) to one of a joining element (2) in the original position (3)

reaches an acceptable area, is designed such that a template position (3) reaching joining element (2) under the action of the gas stream (8) the original position (3)

in the correct position.

4. Device according to one of the preceding claims, characterized in that the wall sections (IIa) is adapted to an outer contour of the joining element (2).

5. Device according to one of the preceding claims, characterized in that the Anströmmittel are formed, a joining element (2) by means of the gas stream (8) from one end of a Zuführabschnitts (7), with which a joining element

(2) can be brought into line with the device, to move to the feed point (3).

6. Device according to one of the preceding claims, characterized in that in a region in which a joining element (2) occupies the original position (3),

Discharge sections (10) for removing the directed gas flow (8) are present.

7. Device according to one of the preceding claims, characterized in that a vacuum arrangement for generating a negative pressure gas in the region of the original position

(3) is present.

8. Device according to one of the preceding claims, characterized in that an overpressure arrangement for

Generation of a gas overpressure in the region of the original position (3) is present.

9. Device according to one of the preceding claims, characterized in that the inflow means are adapted to generate a gas stream (8), so that gas flows to a in the initial position (3) existing joining element (2).

10. Device according to one of the preceding claims, characterized in that the inflow means are adapted to generate a gas flow, so that gas flows away from a present in the original position (3) joining element (2).

11. Device according to one of the preceding claims, characterized in that the original position (3) along one of the punch (5) zurücklegbaren path between a retracted position and one in the direction of

Component section extended position is formed.

12. Tool (1) for attaching a joining element (2) on a component portion with a linearly movable punch (5), characterized in that a device according to one of the preceding claims is present.