DE2413309A1 - WELDING MACHINE WITH ADJUSTABLE PUSHING MOVEMENT FOR ELECTRIC RESISTANCE WELDING OF ROD-SHAPED PROFILES, IN PARTICULAR OF CHAIN LINKS - Google Patents

Description

2413309 Maxton - Maxton · Langmaack Patentanwälte

Alfred Maxton sr.

Applicant: Meyer, Roth & Pastor, Alfred Maxton jr.

Jürgen Langmaack

Maschinenfabrik GmbH, Cologne Dipiom-ingenieuro

5 Cologne 51

Pferdmengesstrasse 50

Our sign: 17 pg 744 'Day: 3/18/1974

Description: Welding machine with adjustable upsetting movement for electrical resistance welding of rod-shaped profiles, especially chain links

The invention relates to a welding machine for electrical resistance welding of rod-shaped profiles, in particular for Welding of the individual chain links of a chain composed of pre-bent O-shaped chain links, which is an electrical Welding device and a compression device acting on the profile ends to be welded, the Upsetting steels are moved as a function of a movable, preferably rotating control disk.

The use of such control disks to guide the movement of the upsetting steels is. basically known, for example from DT-OS 1 811 914. In many cases, there is now a requirement on the

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- Matching machine profiles with different cross-sections, in Case of the chain link welding machines Chain links with different wire diameters and different chain link shapes to weld. While it is now relatively easy to use the appropriate tools, such as the saddle to support the too welding profile or chain link, the upsetting steels and also the electrodes in relation to their distances from one another and in To adapt their dimensions to the demands made by a corresponding design using interchangeable molded parts, it causes considerable difficulties for spatial reasons alone, the movement mechanism for the upsetting device to the changed geometric shapes and the ones that come with them adapt to changed welding conditions.

The invention is now based on the object the known machine to improve this so that the adaptation of the movement of the upsetting device to different dimensions and to different welding conditions is possible in a simple manner. According to the invention, this object is achieved by that the control disk is designed to be variable at least over a portion of its control contour. This makes it possible to achieve a predetermined course of the movement of the upsetting device by changing the control contour. For example in mechanical chain welding machines, in which the contact pressure of the upsetting device on the chain link to be welded is effected with the aid of pretensioned springs, can be achieved by a variable configuration of the control contour of the control disk a sequence of movements can be achieved in which in the initial phase

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the weld is worked with a very low upsetting pressure. This creates great resistance at the welding point which allows welding with high amperage or high power without burns occurring on the chain link. This measure also results in significant improvements in machine performance. On the other hand, it is with one corresponding training of the variable part of the control contour possible, not just an adaptation to different shapes, for example of chain links to be welded perform, but also the welding process itself can be changed in a simple manner. While in the case of the above Welding machine a resistance butt welding is carried out, can by the arrangement of an approximately wave-shaped running control contour of the welding process in the flash-butt welding process, because the wave contour reversing the upsetting steels. In a preferred embodiment, it is provided here that the control disk is designed to be changeable only in its area assigned to the welding and upsetting time. This area extends in chain welding machines with a revolving control disk, for example, over a range of about 120 °, while the remaining area for the holding time, the lifting of the upsetting steels and the subsequent chain transport and positioning the upsetting steels to the new chain link in the saddle must be available. Since this, larger functional area can in principle remain unchanged, the change only offers the area assigned to the welding and upsetting time, considerable structural simplifications in the design of the control disk,

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In a preferred embodiment of the invention provided that the basic contour provided with a control disc for changing the control contour of an adjustable contour piece is connected at least over a partial region with \ least. This configuration offers the advantage that, starting from a basic contour, the variable area of the control contour in question can be changed by adjusting the contour piece in its overall contour, so that the movement of the upsetting steels of the upsetting device can be changed according to the setting of the contour piece in relation to the basic contour.

In an embodiment of the invention, it is particularly advantageous if one end of the contour piece extending over a partial area is pivotably articulated to the control disk in the radial direction and the other end is connected to the control disk via an adjusting device. In this configuration preferred for chain welding machines , in which the adjusting device, viewed in the direction of rotation of the revolving control disk, lifts the trailing end of the contour piece in the radial direction, there is the advantage that over a relatively long period of time even with the welding current switched on; the two are pressed to be welded to the chain link ends to a relatively \ low upsetting pressure against each other and in that; In a short time, the full compression pressure can be applied to the chain link ends, which are definitely brought up to welding temperature. Due to the adjustability of the contour piece, the period in which the two chain link ends to be welded are subjected to reduced upsetting pressure can be set very precisely.

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so that an optimal adaptation of the upsetting device can be adjusted to the welding conditions specified by shape, cross-sectional dimensions, material, current flow, etc. can.

In a further advantageous embodiment of the invention it is provided that with the control disc, at least two, with a different control contour provided contour pieces are connected. This arrangement has the advantage that in addition to one gradual change in the sequence of movements of the upsetting steels through the arrangement of at least one second, optionally usable Control contour can also be set in a simple manner for a fundamentally different sequence of movements, for example for a resistance butt welding or a flash butt welding, in which case the second control contour is an approximately wave-shaped Would show course. One or the other control contour can be selected by means of the associated adjustment devices be placed in puncture.

In a further embodiment of the invention it is provided that at least one correction piece is provided through which a Part of the adjustable contour piece can also be changed in relation to the effective control contour. This can be for example, by additional ones that can be connected to the control contour and / or the control disk itself, for example in the contour nose-shaped correction pieces are effected for a Partial area that cannot be influenced to the desired extent by adjusting the contour piece, a targeted adjustment

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change of the control contour is effected.

The invention is illustrated by means of schematic drawings of exemplary embodiments explained in more detail.

Fig. 1 shows an embodiment in which the upsetting force with The help of preloaded springs is applied

FIG. 2 shows a side view of the device according to FIG. 1. FIG. 3 shows schematically a displacement-controlled upsetting device

Fig. 4 shows schematically a plan view of a control disk with two contour pieces.

In the chain link welding machine shown schematically in FIGS For example, two electrodes 1 are movably mounted in a machine frame (not shown in detail), in the direction of a saddle 2, which is also attached to the machine frame, for receiving the one to be welded in each case Chain link 3 are movable. The chain to be welded will by transport devices not shown in detail

transported so that a new chain link still to be welded is brought into the welding position shown. The transport can take place in such a way that either only one is welded over the other chain link or, if one additional turning device is provided, the chain links are welded one after the other.

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The upsetting device is arranged in the plane defined by the chain link 3 to be welded. This has two upsetting steels 4 and 5, which are each connected to associated transmission levels 6, 7, which in turn are supported on the machine frame via the bearings 8, 9. At the free, longer lever ^; At the end of the transmission levers 6, 7 a toggle lever arrangement is provided which consists of the two transmission levers 10, 11 which are connected to one another by a cross yoke 12 «

As can be seen from the side view according to FIG. 2, the cross yoke 12 stands with an angle lever mounted on the machine frame 13 in connection, at the end 14 on the yoke side, preferably one pre-tensionable spring battery 15 is arranged, with the help of which the upsetting force acting on the chain link to be welded is produced. The other end 16 of the angle lever is provided at its free end with a roller 17, which is on a control disk 18 supports. The control disk 18 is attached via a control shaft 19, which is also mounted in the machine frame. The control disk has a control contour 20 running eccentrically with respect to the axis of rotation of the control shaft 19. From the above description it can be seen very easily with reference to the drawings that the spring battery 15 is the upsetting steel 4, 5 is only able to press on the chain link 3 to be welded to the extent that the control contour 20 of the circumferential Control disk 18 releases a rotary movement of the angle lever 13 via the roller 17 resting thereon. This causes a practically precisely defined upsetting force exerted on the chain link can be.

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The control contour is now designed so that when it rests of the roller 17 over the angular range a a lifting of the upsetting steels takes place and the chain transport becomes possible. In the area of the> Angle b, the upsetting steels are placed and thus the chain link to be welded is adjusted on the saddle 2. At the same time, the welding electrodes 1 are placed on the two ends of the weld joint during this time. During the The contour area is traversed by the roller in accordance with the angle c, the welding current is introduced and then after practically complete release of the roller 17, the application of the full upsetting pressure to the one brought to the welding temperature Ends of the weld joint. In the angular range d, the welded chain link is held under the full compression pressure. The process is then repeated for a new chain link.

In order to reduce the upsetting pressure during the welding process, i.e. optimally to the welding conditions required for each individual case, i.e. each type of chain link, during the angular range c to be able to adapt, according to the invention, the control contour is not fixed, but is in the control disk A contour piece 23 is provided in a recess 21, covering approximately the angular regions b and c, with the aid of which the course the control contour can be changed. In the illustrated embodiment, the contour piece 23 is with its one End (run-up end) hinged to the control disc while it is connected with its run-off end to the control disk via an adjusting device 24. This adjusting device can

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for example as shown in the form of a pressure screw which is secured against self-loosening by appropriate securing means. By pivoting the contour piece radially 23 with the aid of the adjusting device 24 can now be applied to the welding process during the welding process Adjust the compressive force acting on the chain link very precisely. Only when the roll 17 runs over the end edge 25 does it sag the spring battery 15 in the upsetting device introduced upset pressure in full.

In Fig. 3 another embodiment is shown in which the upsetting force is not by a pretensioned spring battery is applied directly to the chain link via the control disk by pivoting the angle lever accordingly. For this purpose, the yoke 12 'is arranged below the articulation points for the connecting lever 10 ·, 11', so that by moving of the yoke 12 ″ in the direction of the arrow 26 upwards, the upsetting steels move towards the chain link. For safety reasons are the connecting levers 10 ', 11' each with a pretensioned spring27, 28 equipped as overload protection. In addition, the arrangement of the angle lever and the control disk analogous to the embodiment according to FIGS. 1 and 2. It is easy to see that the control contour for this embodiment must be designed so that instead of a drop in the area of the edge 25 according to Fig. 2, a corresponding rise, i.e. an increase in the radial distance between the control contour and the axis of rotation must be carried out in order to apply a corresponding contact pressure to apply the chain link. Also in this embodiment

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the sequence of movements of the upsetting steels can be achieved through a corresponding design of the contour piece changing the control contour and thus the upsetting force to the welding conditions required for the type of chain link being processed be adjusted exactly.

In Fig. 4 is a schematic plan view of a control disk another embodiment shown. In this embodiment, in a control disk 18, which has a corresponding Has recess 21 ', two parallel next to each other Contour pieces 29 and 30 are arranged. With such a configuration, it is possible to not only gradually adjust the control contour, as previously described, to change but also in principle, namely by the fact that, for example, instead of the contour piece 29 the contour piece 30 is brought into the working position. While that Contour piece 30 is in engagement with the roller 17, is the contour piece 29 lowered so far that it is out of engagement. Here, the second contour piece can, for example, extend over the Angular range c have partially extending wave contour, so that the upset steels reverse and thus, flash butt welding becomes possible.

Instead of arranging two contour pieces with different ones Length, as shown in FIG. 4, two or more contour pieces of the same length can also be arranged next to one another. Ever According to the requirements for the changeability of the control contour, the contour pieces can also be divided as seen in the circumferential direction and be linked to one another in a chain and with a common

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seeds or an adjustment device assigned to each partial contour piece. Furthermore, for more complicated welding processes it can be advantageous to provide one or more correction pieces in addition to the adjustable contour piece, by means of which one or more subregions of the adjustable contour piece can also be changed with respect to the effective control contour. These correction pieces can be adjustably mounted either in the contour piece itself or in the control disk. It is also useful if the contour pieces are detachably connected to the control disk so that when changing the production program, a corresponding adaptation to the new chain link type can be made in a simple manner by exchanging the contour piece. Here, too, the particular advantage of the embodiment according to the invention is evident, since the control contour is practically anyway over the angular ranges d, a, b ^; are determined by the maximum required travel of the upsetting steels, which also have detachable upsetting inserts, only the part of the control contour required for the angular range b, c needs to be exchanged in order to effect the necessary adjustment.

The invention is not limited to that shown and described; Arrangement of the contour piece and the design of the adjustment

i direction restricted. In the same way, instead of pivoting the contour piece to change the control contour accomplish this by a contour piece that can be moved in the body of the control disk like a gate or via a eccentric bearing is designed to be rotatable. Even the

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Instead of a pressure screw, which represents the simplest solution, adjusting device can have adjusting parts guided radially or tangentially in the control disk.

Expectations

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Claims (8)

Expectations 1. J Welding machine for electrical resistance welding of rod-shaped profiles, in particular for welding the individual chain links of a chain composed of pre-bent O-shaped chain links, which has an electric welding device and an upsetting device that acts on the profile ends to be welded, the upsetting steels of which depend on a movable, preferably revolving control disk, characterized in that the control disk (18) is designed to be changeable at least over a portion of its control contour (20). 2. Welding machine according to claim 1, characterized in that the control disc (18) only in its, the welding and the area (c) associated with the compression time is designed to be changeable 3. Welding machine according to claim 1 or 2, characterized g e k e η η - draws' that the control disc provided with a basic contour (20) for changing the control contour at least over a partial area with at least one adjustable contour piece (23,29,30) is connected. 4. Welding machine according to claim 1, 2 or 3 »characterized in that t the extending over a portion of contour piece (23,29,30) pivotably articulated at one end to the control disc (20) in the radial direction and on the other with their 503840/0080 Ren end via an adjusting device (24) is in communication with the control disc. 5. Welding machine according to one of claims 1 to 4, characterized in that the control disc (20) at least two contour pieces (29, 30) provided with a different control contour are connected. ' 6. Welding machine according to one of claims 1 to 5, characterized in that at least one correction piece is provided, through which a portion of the adjustable contour piece (23,29,30) additionally with respect to the effective control contour is changeable. 7. Welding machine according to one of claims 1 to 6, characterized in that the contour piece (23,29,30) and / or the correction piece is mounted displaceably and can be locked. 8. Welding machine according to one of claims 1 to 7, characterized in that the contour piece (23,29,30) is releasable is connected to the control disc (18). 509840/0080