EP1017519B1 - Feed mechanism for a forming device, especially a cold forming device such as a rotary swaging device - Google Patents

Description

The invention relates to a forming device, in particular a cold forming device like a rotary kneading device that has a feed device, through which a workpiece to be machined can be moved by a reducing device is, wherein the reducing device acting on the workpiece Has tool segments that periodically with an operating frequency of one Closed position in which the tool segments are in active engagement with the workpiece to be machined are movable into an open position, the one Has sensor unit through which the position of the tool segments of the reducing device is detectable, the sensor unit being the position of the tool segments characterizing sensor signal that generates a Evaluation unit is conductive, the evaluation unit depending on the your supplied sensor signal a control signal controlling the feed device generated, the feed device controllable in this way by the control signal is that with the closed position of the tool segments a minimal Feed and a maximum when the tool segments are open Feed can be generated.

Such a shaping device is known from US Pat. No. 3,447,349. In the publication describes a press that has a stationary anvil and a tool segment movable towards and away from the anvil and has a feed device which can move towards this shaping device, around parts of the workpiece to be machined between the anvil and to move the tool segment, the feed device one for Press sliding carriage and means for holding the workpiece are arranged on the carriage. Furthermore, the known shaping device Means by which this workpiece holder is relative are movable to the car. By a trained as a pressure sensitive switch The position of the tool segment can be detected by the sensor unit. This pressure-sensitive switch then generates the position of the tool segment characterizing sensor signal, which is sent to an evaluation unit, the generates a control signal for the feed device, such that the the carriage carrying the tool holder is constantly moving forward, and that at one A corresponding movement of the tool segment in the closed position of the workpiece holder compensates for the forward movement of the carriage becomes.

From US-PS 4,578,983 a device for reducing the thickness of a Known plate, which is a feed line for moving the plate forward and a Pair of pressing tools arranged on opposite sides of the plate are. One of the pressure surfaces of the two pressing tools has one parallel to the plate surface, which is substantially parallel to Feed line runs. The other printing surface has an inclined surface, which includes a predetermined angle with the feed line. The Press tool with the inclined surface is driven vibratingly, while the plate is continuously moving forward.

It is an object of the invention to provide a forming device of the type mentioned at the beginning Kind in such a way that the working frequency of the tool segments of a reducing head adapted feed is achieved. In addition, a Method for feeding a workpiece through such a forming device be created, in which an operating frequency-adapted feed is guaranteed.

This object is achieved in that the reducing device a reducing head through which the workpiece is fed from the feed device is movable, and the one tool guide in the tool segments radially are slidably mounted, and a roller cage with rollers through which the Tool segments are radially displaceable, and that the sensor unit in a defined position with respect to the tool segments on the tool guide is arranged, the roller cage of the reducing head by one given by the direction of advance of the workpiece with a first axis Angular velocity and the tool guide with one of the first Angular velocity different second angular velocity moves is, whereby it can be determined by the sensor unit whether there is a role in its Detection area is located.

The measures according to the invention are advantageous a matched to the operating frequency of the tool segments of the reducing device Feed of the workpiece is achieved, which is not only reduced in one Loads on the tool segments and / or the workpiece, but also an overall faster feed speed and thus accelerating the forming process. In advantageous The way the power generating the feed movement of the invention Feed unit withdrawn while the tool segments the reducing device in its closed position which acts on the workpiece are. As soon as after the machining step of the workpiece open the tool segments, is by the feed device according to the invention the feed of the workpiece to be machined increases, thus an optimal insertion path with a maximum working stroke of the tool segments is achieved. Since by the feed device according to the invention the tool segments of the reducing device in an advantageous manner and No longer the feed motion of the workpiece when closed Tool elements will have to compensate, especially their wear drastically reduced and the total load on the forming device according to the invention reduced. In addition, a excessive axial and / or torsional load on the workpiece to be machined avoided during the closing process of the tool segments.

Advantageous developments of the invention are the subject of Dependent claims.

Figur 1

ein Ausführungsbeispiel einer Vorschubeinrichtung zusammen mit einer Reduziereinrichtung einer Kaltumformungsvorrichtung,

Figur 2

eine schematische Ansicht der Reduziereinrichtung aus der Richtung II der Figur 1,

Figur 3

eine schematische Ansicht der Reduziereinrichtung aus der Richtung III der Figur 1,

und Figur 4

ein weiteres Ausführungsbeispiel einer Vorschubeinrichtung.

Further details and advantages of the invention can be found in the exemplary embodiment which is described below with reference to the figures. Show it:

Figure 1

an embodiment of a feed device together with a reducing device of a cold forming device,

Figure 2

2 shows a schematic view of the reducing device from the direction II of FIG. 1,

Figure 3

2 shows a schematic view of the reducing device from the direction III in FIG. 1,

and Figure 4

another embodiment of a feed device.

The exemplary embodiment of a forming device 1 shown in FIG. 1 for forming, in particular for cold forming, a workpiece 2 essentially from a known per se and therefore only hereinafter reducing device 20 described in extracts with a reducing head 21, in particular a round kneading head and a feed of the workpiece 2 effecting feed device 10 with an actual feed movement of the workpiece 2 causing the feed element 11.

As can best be seen from FIGS. 2 and 3, the reducing head 21 a number - in the exemplary embodiment shown here four - tool segments 22a-22d to achieve the desired deformation of the workpiece 2 Periodically apply this force to the tool segments 22a-22d with their operating frequency from their closed position shown in FIG. 2, in which they are in active engagement with the workpiece 2, in one in FIG. 3 shown open position are moved, in the active engagement of the tool segments 22a-22d is lifted with the workpiece 2 and the workpiece 2 is pushed further by the feed device 10.

It is now important in the shaping device 1 described that the feed of the workpiece 2 - in contrast to the known devices, at which a continuous feed movement of the workpiece 2 during forming, especially in cold forming; is provided - can be specified in this way, that in active engagement with the workpiece 2 tool segments 22a-22d a minimal or no feed movement and when open, that is not in active engagement with the workpiece 2 tool segments 22a-22d a maximum feed movement can be achieved. This will be more advantageous Way achieved in that, on the one hand, the position of the tool segments 22a-22d by a suitably selected sensor unit 30 (see FIGS. 2 and 3) the position of the tool segments is monitored 22a-22d characterizing sensor signal S generated that to one of this sensor signal S evaluating evaluation unit 40 is directed, and that on the other hand the feed device 10 is designed such that the feed movement generated by it of the workpiece 2 at least between a minimum and A maximum feed movement can be controlled: The evaluation unit 40 generates depending on the sensor signal S fed to it, the feed element 11 of the feed device 10 controlling control signal V. This causes. that with an active intervention of the tool segments 22a-22d. aiso in the Rule at their closed position, the feed element 11 a minimal Feed of the workpiece 2 is generated, which is preferably zero. while at not in active engagement with the workpiece 2 tool segments 22a-22d, that is generally in their open position, a maximum advance of the Workpiece 2 is effected. This causes in an advantageous manner of the shaping device 1 described, the feed rate or energy can be greater when the tool segments 22a-22d are open than when closed tool segments 22a-22d, as with closed tool segments 22a-22d the wear-generating large feed energy is not effective is.

Monitoring of the effective position of the tool segments by the sensor unit 30 takes place indirectly.

In the case of indirect recording, it is provided that the immediate position is not of the tool segments 22a-22d of the reducing head 21 of the forming device 1, but the position and / or function of the displacement movement of the Tool segments 22a-22d effecting further components of the shaping device 1 is detected. Such indirect detection is in the figures 2 and 3, in which a view of the reducing head 21 in the feed direction of the workpiece 2 is shown. This reducing head 21 points in in a manner known per se, a roller cage 21 a, in which a variety of rollers 23 is arranged, and a tool guide 21b, in which the Tool segments 22a-22d are guided displaceably in the radial direction.

By now the roller cage 21a of the reducing head 21 by one by the feed direction of the workpiece 2 predetermined axis A with an angular velocity is moved, which depends on the angular velocity of the tool guide 21b differs, it is caused in the position shown in Figure 2 Tappets 22a'-22d 'of the tool segments 22a-22d each from a roller 23 acted upon and thus moved into their closed position in which the radially inner ends forming the actual tools 22a "-22d" apply force to the workpiece 2 to achieve the desired forming. If the roller cage 21a is now moved further, the active engagement becomes between the tool segments 22a-22d and the previously assigned roller 23 of the roller cage 21a of the reducing head 21 lifted so that the tool segments 22a-22d in the space between two rollers 23 back away, causing the tool segments 22a-22d to move away from the workpiece 2 and release it in such a way that the workpiece 2 around the now machined area can be moved forward.

By now providing that the tool segments 22a-22d co-rotating tool guide 21b, the sensor unit 30 is arranged by which can be determined whether there is a roller 23 in its detection area or not, may be due to the defined spatial relationship between the sensor unit 30 and the tool segments 22a-22d from the evaluation unit 40 are calculated whether the tool segments 22a-22d are currently in their active position are or not, and the feed of the workpiece 2 can then accordingly to be controlled.

In Figure 4, another embodiment of a feed device is together shown with a reducing device of a cold forming device, which essentially corresponds to the first exemplary embodiment in FIG. 1, so that corresponding parts with the same reference numerals provided and are no longer described in detail.

There is an essential difference between the two exemplary embodiments in the manner in which the feed movement for the workpiece 2 generates is: While it is provided in the first embodiment that the feed movement essentially by the feed element 11 of the feed device 10 is generated, the second embodiment provides that the In addition to the feed element 11, a feed device 10 includes a slide 12 having in and / or against the feed device of the workpiece 2 is displaceable and carries the feed element 11, so that the working frequency adapted Feeding the workpiece 2 through an interaction of the feed element 11 and the carriage 12 can be generated.

It is preferred here that the feed element 11 and thus the workpiece 2 is moved continuously in the direction of the tool segments 22a-22d at a speed v ₁ , while the slide 12 moves at a speed v ₂ towards the tool segments 22a-22d or moved away that the feed movement of the workpiece 2 to be achieved, adapted to the working frequency, is formed.

But it is also possible that the carriage v ₂ moves continuously at speed v ₂ to the tool segments 22a-22d, while the feed element 11 moves back and forth at a speed v _{1 in} such a way that the feed movement of the working frequency to be achieved, which is to be achieved Workpiece 2 is formed. The person skilled in the art can clearly see that a number of further variants of movements of the feed element 11 and of the slide 12 are conceivable, the (linear) superimposition of which then results in the feed movement of the workpiece 2 which is adapted to the working frequency. For this reason, the above explanations are only to be understood as exemplary variants, which do not limit the generality of the construction and procedure described. In the following, however, for the sake of simplicity, the first case mentioned above is assumed. The person skilled in the art can clearly see how he has to design the corresponding movements of the slide 12 and the feed element 11 in another constellation.

It is then further preferred that the maximum feed speed v _{m of} the workpiece 2 in the direction of the tool segments 22a-22d, which can be achieved during the open position of the tool segments 22a-22d, is achieved in that the feed element 11 moves the workpiece 2 at the speed v ₁ , which is 50% of the maximum feed speed v _m , and that at the same time the carriage 12 moves at a speed of v ₂ , which in turn is 50% of the maximum feed speed v _m , in the direction of the tool segments 22a-22d, so that the superposition of these two speeds v ₁ + v ₂ of 50% of the maximum feed speeds v _m sets this.

During the closed position of the tool segments 22a-22d, in which only a minimal or no feed of the workpiece 2 is to take place, the slide 12 moves at the speed v _{2 in the} opposite direction to the feed direction of the feed unit 10, so that the overall feed movement is minimized or at v ₂ = v _{1 is} completely prevented.

As can be seen from FIG. 4, the feed element can also be used 11 carrying carriage 12 or alternatively, that the reducing device 20 is arranged on a further slide 13, which is functional is to be assigned to the feed device 10.

If the carriage 12 is dispensed with, the carriage 13 takes over the function of the carriage 12 and produced in cooperation with the workpiece 2 in substantially continuously advancing feed element 11 the generation of the feed frequency adapted to the working frequency. Will in the second embodiment both the carriage 12 and the carriage 13 used, so the relative movement of the two carriages 12, 13 on one another in this way matched that in connection with the feed movement of the feed element 11 sets the feed rate to be adjusted to the working frequency.

Claims (9)

1. Forming device, especially a cold forming device such as a rotary swaging device, having a feed unit by which a workpiece (2), which is to be worked, is movable through a reducing mechanism (20), with the reducing mechanism (20) having tool segments (22a-22d) acting upon the workpiece (2) which are movable periodically at a working frequency from a closed position, in which the tool segments (22a-22d) are acting upon the workpiece (2) to be worked, to an open position, having a sensor unit (30) by which the position of the tool segments (22a-22d) of the reducing mechanism (20) is detectable, with the sensor unit (30) creating a sensor signal (S) which characterizes the position of the tool segments (22a-22d) and which can be transmitted to an evaluation unit (40), with the evaluation unit (40) creating in dependance of the transmitted sensor signal (S) a control signal (V), which controls the feed unit (10), with the feed unit (10) being controlable by the control signal (V) in such a way that a minimal feed is creatable when the tool segments (22-22d) are in the closed position and that a maximal feed is creatable when the tool segments (22a-22d) are in the open position, characterized in that the reducing mechanism (20) has a reducing head (21) through which the work piece (2) is movable by the feed unit and which has a tool guide (21b), in which tool segments (22a-22d) are resting radially movably, and a roller cage (21a) with rollers (23) by which the tool segments (22a-22b) are radially movable, and that the sensor unit (30) is arranged on the tool guide (21b) in a defined position relative to the tool segments (22a-22d), with the roller cage (21a) of the reducing head (21) being movable around a given axis (A) defined by the feeding direction of the tool piece (2) with a first angular velocity and the tool guide (21b) being movable with a second angular velocity different from the first angular velocity, while it is detectable by the sensor unit (30), whether a roler (23) is in its detection area.
2. Forming device according to any of the preceeding claims characterized that the sensor unit (30) has a piezo ring for sensing a force, a strain gauge, an axial forcemeter or a photoelectric element.
3. Forming device according to any of the preceeding claims characterized in that the feed unit (10) has a feed element (11).
4. Forming device according to any of the preceeding claims characterized in that the feed unit (10) has a slide (12), which is movable in and/or against the feeding direction of the workpiece (2) and bearing the feed efement (11).
5. Forming device according to any of the preceeding claims characterized in that a further slide (13) is provided which is movable in and/or against the feeding direction of the workpiece (2) and bearing the reducing mechanism (20).
6. Method for feeding a workpiece (2) through a forming device, especially a cold forming device (1), wherein the workpiece (2) to be worked is moved by a feed unit (10) through a reducing mechanism (20), in which the tool segments (22a-22d) of the reducing mechanism (20) are moved at a working frequency periodically from a dosed position, in which the tool segments (22a-22d) are acting upon the workpiece (2) to be worked, into an open position, wherein the position of the tool segments (22a-22d) is detected by a sensor unit (30) and a sensor signal (S) characterizing the position of the tool segments (22a-22d) is created by the sensor unit (20), with the sensor signal (S) being transmitted to an evaluation unit (40) and the evaluation unit (40) creating in dependance of the transmitted sensor signal (S) a control signal (V) which controls the feed unit (10) in such a way that the feed unit (10) feeds the workpiece (2) minimally when the tool segments (22a-22d) are in a dosed position and maximally when the tool segments (22a-22d) are in the open position, characterized in that a reducing mechanism (20) with a reducing head (21) is used through which the workpiece (2) is moved by the feed unit and in which tool segments (22a-22d) are resting radially movably in a tool guide (21b), and wherein a roller cage (21a) with rollers (23) by which the tool segments (22a-22d) are radially movable is used, where the roller cage (21b) is moved with a first angular velocity and the tool guide (21b) with a second angular velocity different from the first, and that it is detected by the sensor unit (30), whether there is a roller (23) acting on the tool segments (22a-22d) in its detection area.
7. Method according to claim 6 characterized in that no feed of the workpiece (2) is performed in the closed position of the tool segments (22a-22d).
8. Method according to any of the preceeding claims characterized in that the workpiece (2) is moved by a feed element (11) of the feed unit (10) to achieve a feed adjusted to the working frequency.
9. Method according to any of the preceeding claims characterized in that the workpiece (2) is moved by the feed element (11) as well as by a slide (12) carrying the feed element (11) and/or the reducing mechanism (20) is moved by a further slide (13) carrying it.

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