DE2727162A1 - DEVICE FOR OXYGEN FLAME CUTTING OF METAL STRIPS - Google Patents

Description

Dipl.-Chem. Or. Brandes Dr.-lng. Held Dipl.-Phys. Wolff

D - 7 Stuttgart 1. Long Strato

Tel. (0711) 29 6310 and 29 72

Telex 07 22312 (patwo d) Telegram address:

tlx 07 22312 Wolff Stuttgart

PA Dr. Brandes: Headquarters Munich Postal Scheddrto. Stuttgart 7211-700

BLZ 60010070

Deutsche Bank AG. 14/28630

BLZ 60070070

Office hours:

9-11.30 a.m. 1.30pm-4pm

except saturdays

June 15, 1977

Our ref .: 125 388/484633 rdi

Italsider S.p.A., 4, Via Corsica, Genova (Italy)

Device for oxygen flame cutting
of sheet metal strips

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Telephone information and orders are only possible after written . Confirmation binding

The invention relates to a device for separating arc-shaped strips by means of oxygen flame cutting, which consist of a longitudinal support bench for the sheets to be cut, at least one displaced along this length Portal, at least one slide controlled along the portal, as well as means, which repeats a predetermined profile strip from the sheet metal strip by at least one flame cutter split off.

Welded beams are semi-finished products that are welded together of three or two elements, ζ. Ex. Legs or legs and web made of sheet steel strips will.

The cutting of sheet metal into strips using oxygen flame cutting is an automatic process that is used in the following as an oxygen cutting portal for sheet metal designated device is carried out.

Portals of this type - each system can also be equipped with several portals - consist of a box-shaped one Cross member supported at both ends by two abutments fitted with wheels running on two tracks is; the gauge of the tracks is determined by the largest width of the sheet to be cut. Between the tracks are equipped with support benches for the metal sheets. This system is called a separation bench.

The portal moves on the tracks, the box-shaped The cross member is always held perpendicular to the bench and to the direction of displacement.

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The sheets to be cut are arranged on the bench so that the largest dimension of the sheets is parallel to the tracks comes to rest; consequently, the cross member facing the bishop is arranged perpendicular to the largest dimension.

The box-shaped cross member is in its longitudinal direction provided with wheels on which a prism-shaped rod can be networked; the movement of this rod is parallel to the box-shaped cross member of the portal and therefore perpendicular to the Direction of displacement of the portal on its wheels. On the prismatic rod there are supports for the oxygen cutting device, that is, the torch or torch cutters attached. The wheels of these supports run on the same tracks like * r prismatic Stao, and the supports can be at any Be attached to the point of the rod. The rod can also be attached to the cross member so that it is firmly attached to it connected v / ird.

The oxygen cutting portal for sheet metal of the kind like essentially previously described, shifts in both directions along the tracks of the cutting bench. The torch cutters (all independent from each other) can rise or fall in relation to the individual supports. The drive devices for the Portal as well as for lowering or lifting the torch cutters are all provided on a single control panel.

The prism rod does not move autonomously; it can be firmly connected to the box-shaped cross member by hand or it can be inserted from the outside Movement can be set.

The other movements of the oxygen cutting device are controlled by hand; there are these: positioning the Flame cutter supports for the prism rod; Inclination of the torch to the vertical in all possible planes,

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The carriers that can be produced by such systems can have two orthogonal axes of symmetry, a single axis of symmetry or have no symmetry axis. Beams with a double axis of symmetry show no noticeable deformations due to welding shrinkage. Carriers with a single or without an axis of symmetry, however, are after their production deformed in such a way by welding shrinkage that a complex reworking, which makes the end product very expensive, is unavoidable is.

The welded beams are deformed in two ways by the welding, namely arcuate or curved.

In the first case, an arc is formed in the plane containing the only axis of symmetry. Example: A T-iron is used in the Deformed plane formed by the web and this regardless of whether the web width is larger or smaller than the leg. Curvature, on the other hand, is a deformation of the beam in the plane orthogonal to the first plane. You have such a deformation for profiles without an axis of symmetry. Example: "L" iron. at In this particular case, both types of deformation occur; H. one has arcs and curvatures.

Another example is a "U" iron, its axis of symmetry does not go over any of the three elements parallel to the two legs: it exhibits a curvature in the plane of the said Axis up.

In general, arcing is the deformation occurring in the plane of the largest element, while with curvature the deformation in the plane of the smallest element orthogonal to the first is meant.

The main aim of the present invention is to make straight beams.

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The carriers produced with the previously known systems of this type appear after welding and cooling curved and in order to obtain material that meets the requirements, there is no other option than the carrier to straighten out afterwards.

Although the problem of straightening composite beams is not an issue of the present invention, they may be usually for this purpose separately or with each other, as the case may be in connection with the procedure used. These are: heating flames, rapid cooling systems (quenching), hammer with the simultaneous use of wedges or the like or - more recently and especially for a certain series of profiles: A specially constructed roll straightening machine, whereby a continuous straightening with better success and significantly larger ones Speed can be achieved.

After all, all of these processes are time-consuming and adversely affect the cost of the end product, which applies insofar as it is applicable as cheap as possible.

Considering these disadvantages, it has been found that when an unbalanced Beam which, after its manufacture, deforms to a certain extent and in a certain way, with elements which have the same deformation at the beginning, but in the opposite direction, turn into one at the end straight beam must result.

Since a single element (usually the web) is usually deformed in the composite of an asymmetrical beam, it is provided that cut this element with the same stitch (= deformation of the finished beam with the straight element) and it to be welded to the other element in such a way that the cooling of the welds and the surrounding material is arcuate cut element straightened again.

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Based on this principle, after careful study to determine the most appropriate stitches, various devices have been made Developed for cutting off curved strips. The size of the stitch depends on:

the length of the wearer

the width of the beam and

the thickness of the strip.

The shape of the curvature is of lesser importance; from the theoretical Calculations result in an arc of a circle, while in practice the most appropriate curve is found in the central part almost forms an arc of a circle, but deviates somewhat from this shape in the direction towards both ends. This condition does not affect the straightness of the beam in any way.

To cut sheet metal strips in the shape of a sheet, you could z. B. move the torch useful along the cross member while the crossbeam and portal are offset along the cutting benches. The guide for the relative transverse displacement of the torch cutters to the cross member can be produced by means of profiles arranged next to the cutting bench Flame cutter controls during the advance of the portal.

The control of the movement of the torch cutters can be mechanical, but this requires many rows of profiles and a large amount of space to arrange the profiles next to the bench that carries the sheets to be separated.

The present invention has as its object all of the above Fix cons.

In a device of the type mentioned at the outset, this is the task solved according to the invention in that repetition means are provided, the one on the offset in the longitudinal direction Portal arranged cam have the with a relative for the advance speed of the protals predeterminable transmission ratio is driven in rotation, this cam is connected to a tappet device that the cam

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profile follows and changes the cam profile to the torch cutter on the portal, perpendicular to the direction of displacement.

to change the transmission ratio within predetermined limits to be able to change between the feed speed of the portal and the angular speed of rotation of the cam in a preferred embodiment between the shaft of the cam and one in rotation by the portal feed actuated motor shaft a reduction gear with variable transmission ratio is used.

The drive shaft rotates a rubber-coated wheel, which in turn is a rubber-coated disc sets in rotary motion, which is arranged on a wheel perpendicular to the drive shaft for said rubber-coated wheel Shaft pressed on; a further reduction is possibly the above-mentioned wheel, which is in the axial direction is displaceable on its drive shaft, upstream or downstream.

The pusher device controlled by the mentioned cam during the displacement is composed of two arranged at the ends of a bracket Roles formed; the first of these rolls rolls on the profile of the cam - also known as the positive profile and the second roller on the profile of a second, in rotation with respect to the first fixed cam, which is also called complementary profile designated profile 'is worked out of the positive profile, and causes the distance between the two roles mentioned above remains constant and that the first roller rolls on the positive profile.

The ram device is movable along the portal Torch cutters coupled by a connecting rod, which at one end with the pusher device and at the other end with the support of the torch is articulated, the connecting rod also on the portal, on one along the

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- ίο -

Connecting rod relocatable center point, articulated is.

The device sees rehrere on one with the end of the Connecting rod and rod that is articulated to the ram device can be displaced and fastened thereon Flame cutter before.

The object, advantages and features of the invention are based on the accompanying drawings of exemplary embodiments explained in more detail by the following description.

Show it:

Figure 1 shows a floor plan of a portal known per se for oxygen flame cutting of sheet metal;

Figure 2 is an enlarged partial section along the plane II-II of Figure 1;

Figure 3A in section an "I" -beam with double symmetry to two perpendicular axes (x) and (y);

Fig. 3B in section a "T" -beam with simple symmetry to an axis (x);

Fig. 3C and Fig. 3D in section two "L" beams without any axis of symmetry;

Fig. 3E and Fig. 3F in section two "C" beams with a single axis of symmetry (x);

Figure 4 schematically, in perspective view, a "bow-like" deformed carrier with a "T" -shaped cross-section;

Figure 5 schematically, in perspective view, a "curved" deformed "C"support;

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Fig. 6 half of the deformation of a beam showing its stitches in equally spaced positions;

Figure 7 shows the geometrical structure known per se for determining the value of the equally spaced stitches (f,) of a support which is essentially deformed according to an arc of a circle;

Figure 9 is a schematic floor plan of the drive for the transmission of the movement in the transverse direction from the cam to the supports of the gas cutters of an embodiment of the device according to the invention;

Fig. Io is a diagram that shows how and within what limits the device shown in Fig. Io can be controlled, and

Fig. 11 and Fig. 12 a floor plan and a section according to plane XII-XII of Fig. 11 of the cam and the bracket actuated by the cam.

In Figure 1, a bank for sheet metal is shown at 1, only the zone surrounding a flame cutting portal 2 can be seen; this portal 2 runs parallel to the longitudinal direction of the bench 1 and to the tracks 3 provided on both sides thereof. The portal 2 consists of two symmetrical abutments 4 and one horizontal and box-shaped girders 5 arranged perpendicular to the longitudinal direction of the tracks 3. On this box-shaped girder

5 is a guide, namely horizontal and parallel to this

6 provided for a prism pole 7, which consequently can be used in any if necessary, catfish known per se can be added.

On the prism rod 7, flame cutters 9 carrying supports 8 can also be attached. The flame cutter 9 can moved up and down and, depending on the one used for cutting

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- 12 of the sheet metal strip edges required type, be inclined.

The present invention is an improved device, whereby the prism rod 7 parallel to the box-shaped Carrier 5 can be moved while the portal

I shifts lengthways. This will move yourself at the same time with the prism rod, in the transverse direction, also the flame cutter 9, which the edges of the individual sheet metal strips cut in a bow shape.

As shown in Figures 8 to 12, a motor (not shown) is used to drive the portal 1 corresponding transmission ratio, the movement of a secondary shaft 11 actuated by a special gear serves to drive a cam Io; on this shaft 11 a rubber-coated wheel 12 is rotatably arranged, but this is inter influence of a control along the shaft

II can move freely. The rubber-coated wheel 12 operates a rubber-coated disc 13 having a shaft 14 perpendicular to the shaft 11. Obviously changes When changing the axial position of the wheel 12 on the shaft 11, the ratio of the angular speeds of the shafts and 14. A screw 15 is pressed onto the shaft 14, which in turn actuates a shaft 18 on which the cam Io pressed on. By shifting the wheel 12 on the axis of the shaft 11, the whole changes Transmission ratio of the system shown in Figure 8, which is why, since the rotation of the shaft 11 with the displacement of the portal 2 is firmly coupled, it can be caused that a complete revolution of the cam Io, d. H. the wave 18, corresponds to any predetermined path of the portal. Even if such considerations are only within predetermined Limits apply, but they are applicable to all those lengths that are used when cutting sheet metal strips with the inventive Plant can occur.

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The cam pressed onto the shaft 18 has two profiles 2o and 21, which are referred to as positive and negative profiles will. The radial distances of the individual points of the positive profile from a base circle 22, which is to the axis * of the shaft driving the cam is concentric, correspond to the stitches (f.) of the arcuate profile, the you want to give the sheet metal strips shown in Figures 6 and 7. As a result, they control the displacement of the torch cutters 9 by a ram device, which in turn is controlled by the profile of the cam Io, and it results in a Arched section according to the profile shown in Figure 6.

The cam Io has one formed from two symmetrical halves positive profile 2o, since the curved sheet metal strip is symmetrical to a central transverse axis.

The ram device, which can follow the positive profile 2o of the cam Io, consists of a pair of rollers 3o, which are attached to the ends 31 of a bracket 32, which by means of a slide 33 along a fixed with the Box-shaped carrier 5 of the portal connected guide 34 can move. As a result, when the torch 9 with the movement of the carriage 33 are connected, they pass on the box-shaped carrier 5 one to the positive Profile of the cam Io bound alternating motion.

As already mentioned, the cam Io has a positive profile 2o and a negative or complementary profile 21, consisting of one forming the positive profile of the cam Plate axially offset plate. The profile 21 is drawn and determined so that the distance between the two Roles 3o, one of which follows the positive profile, remains constant.

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When the displacement of the supports of the torch cutters 9 is rigidly coupled with the alternating movement of the carriage 33 there would be a cam Io for each value of the maximum stitch (f) that one wants to give the sheet metal strip, necessary. In order to remedy this disadvantage, the supports of the torch cutters 9 are not directly related to the movement of the carriage 33 connected: The carriage 33 is namely articulated at the end of a connecting rod 4o, this being at the other end either to the supports of the torch cutter

or is hinged to the prism pole to which the torch cutters are attached in order to indirectly control their movements. Of course, the connecting rod 4o is also connected to the box-shaped carrier 5 in an articulated manner at an intermediate point 44. The ratio between the lengths of the arms (a) and (b) of the connecting rod 4o creates the possibility of using a single cam Io _{to produce arched profiles with maximum pitches (f Q} ) that can be varied within wide limits by offsetting the fixed pivot point 44 along the connecting rod 4o.

In picture Io are some numerical values for a practical one Application of the invention shown in which the connecting rod 140 or 140 ', with the same by the cam controlled displacement (q) of the carriage 133, various

1 2
Displacements (q) and (q) at the pivot point 145 or 145 * of the other end of the connecting rod, the support of the torch cutter, depending on the position H or H * of the connecting rod pivot point 44, causes. Obviously, by means of a single cam, both the length of the sheet metal strip to be cut and the largest stitch of the desired curved profile can be varied within wide limits.

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Claims (6)

Claims 1. Device for separating arc-shaped strips by means of oxygen flame cutting, which consists of a longitudinal support bench for the sheets to be cut, at least one portal displaced along this bank, at least one slide displaced in a controlled manner along the portal, as well as means which have a Repeatedly cut predetermined profile strips from the sheet metal strip by at least one flame cutter, characterized in that repetition means are provided which have a cam arranged on the portal which is offset in the longitudinal direction and which is driven in rotation with a transmission ratio that can be predetermined in relation to the feed speed of the portal, whereby this cam is connected to a ram device that follows the cam profile and can transmit changes in the cam profile to the torch cutter on the portal, perpendicular to its direction of displacement. 2. Device according to the above claim, characterized in that, within predetermined limits, the transmission ratio change between the feed speed of the portal and the angular speed of rotation of the cam between the shaft of the cam and a motor shaft confirmed in rotation by the portal feed a reduction gear with a variable transmission ratio is used. 3. Apparatus according to claim 2, characterized in that the drive shaft in rotation is covered with rubber Actuated a wheel that sets a rubber-coated disc in rotary motion on one of the drive shafts vertical for the said rubber-coated wheel arranged shaft is pressed on, and that a white 709881/0775. ORIGINAL INSPECTED tere reduction if necessary the above-mentioned wheel, which in the axial direction on its drive shaft is relocatable, upstream or downstream. 4. Apparatus according to claim 1, characterized in that that the ram device controlled by the cam during the displacement consists of two at the ends of a bracket arranged rollers is formed, the first of these rollers on the profile of the cam - the also known as a positive profile - and the second roll on the profile of a second, in rotation compared to the first permanently connected cam rolls whose - also referred to as a complementary profile Profile from which the positive profile is worked out and the distance between the two mentioned above Holds rollers constant, as well as causes the first roller to roll on the positive profile. 5. Apparatus according to claim 1, characterized in that the ram device with the length of the portal movable torch is coupled by a connecting rod, which at one end with the plunger device and at the other end is articulated to the support of the torch cutter, and that the connecting rod is also articulated to the portal, at a center point that can be displaced along the connecting rod. 6. Device according to one or more of the above claims, characterized in that several, on a rod that is articulated to the connecting rod and to the plunger device can be displaced and torch cutters that can be fastened to this are provided. 709881/0775.