DE3590296T1 - Method for producing profiled bars - Google Patents

Description

43 467 p / wa

SSAB SVENSKT StSl, STOCKHOLM / SWEDEN

Method for producing profiled bars

TECHNICAL AREA:

The present invention relates to a method for producing a profiled rod made of metal, preferably steel, comprising a path with a mainly plane-parallel cross-sectional shape, whose one or both of their long sides edge sections have, the cross-sectional shape of at least one of the flat sides of the web is different. the profiled bar is made by hot rolling a long Universal plate with right-angled cross-sectional shape educated.

BACKGROUND TECHNOLOGY:

In the manufacture of steel profile bars

According to the known technique, one starts from long steel plates with a square or rectangular cross-sectional shapes, i.e. so-called Rolling blocks which, after being heated to Wa I ζ temperature be rolled into the desired final profile bar by means of grooved rollers. Rolling, for example A Wu I st ProfiI rod is partly in one Roller crusher carried out normally with four Grooves are provided, and partly in a finishing roll stand, which usually also has four Is provided with grooves. The cross-sectional profile of the Universa I ρ la11e is successively changed if these pass the pairs of grooves one after the other until the desired final shape at the same time is achieved, to which the length of the profile bar is enlarged. A special one is made for each desired dimension of the finished Wu I st ProfiI rod Set of roll grooves required, provided that the Grooves and sometimes the rolls of the rolling mill can be changed if a different final dimension is too rolling is. It takes quite a bit of time to change the grooves and rollers, so the possibilities limited production of the profile bars in short series with a satisfactory profit in practice are. It also requires a full Product range large roller bearings with a considerable Capital expenditure and storage costs.

As a characteristic of the known technology it is difficult to maintain acceptable tolerances in the width of the profile bar and the sheet thickness.

Other same types of profile poles are approximately generated in the same way, with the same Disadvantages. If the profile bar is asymmetrical with respect to its longitudinal axis, the flow of material is difficult during hot rolling, which is to prevent the material from being crooked or crooked.

Virtually without exception, it becomes crooked or crooked during subsequent cooling.

SUMMARY OF THE INVENTION:

It has now surprisingly been shown that a profile bar can be manufactured according to a method which does not have the disadvantages of conventional manufacturing processes, i. e. one assumes a universe ρ la11e with the same Thickness like that of the track of the finished one Profile bar and heats its edges and rolls them into the desired shape. Warming the edges should be preferably be carried out inductively. This can be done very quickly and allows for hot machining heating to the desired width. The rest of Universal plate remains at room temperature and therefore acts as a counter pressure.

The invention is detailed in the attached claim, in the following description and using an in Embodiment illustrated in the accompanying drawings

■ ir

explained in more detail in which

1 shows a tendon i dstah'l-Proof i L rod

indicates,

Fig. 2 shows a bead bar,

Fig. 3 shows a double I ρrofiI rod,

which then in two bead profile rods is cut,

Fig. 4 shows a starting material,

Fig. 5 schematically shows a device

for heating, upsetting and rolling shows, in the right one Angle to the broad side of the UniversaI ρ Ia11e, and

Fig. 6 to 10 cross sections of the universal plate

as well as the WaI ζ ro IengestaItung along different points the device according to FIG. 5.

DETAILED DESCRIPTION OF THE INVENTION:

Profile rods according to Fig. 1 to 3, the corresponding the invention can be designed to be a have a plane-parallel path (10), one or both of which

Long sides (11) have a shape that is not plane-parallel is. Examples of this are a cutting steel profile bar according to FIG. 1 or a bead profile rod according to FIG. 2. Sometimes it is also advantageous to produce a primary profile rod according to FIG. 3, which consists of two asymmetrical profile bars according to FIG. 2 is composed, which are thereby symmetrical to the plane-parallel path (10), after which the path (10) cut in the middle to make the required profile bar according to FIG. 2 to be obtained.

The profile bar according to FIGS. 1 to 3 consists of a long universal plate (1) with a right-angled one Cross-section according to Fig. 4. This plate is normally by hot rolling a steel plate on a previously determined according to the thickness of the profile sheet (10) Thickness is generated, the width of the plate being sufficient is to form the edge sections (12) as desired. The Universa I ρ la11e (1) can also be split up can be produced from panels of suitable thickness.

The method is characterized in that a or both long sides (11) of the UniversaI ρ la11e on the Wa I ζ temperature to be heated, after which the relevant heated long side (11) in the desired edge section (12) is rolled. The degree of warming depends on how hard the relevant long side of the universal plate (1) is rolled, i.e. how much the Universal plate is to be deformed by reshaping material in the hot state.

If necessary, so will the long side in question

(11) first compressed before rolling, so that the UniversaL ρ La11e (1) has a previously determined width on which the material is brought together along the relevant long side. The upsetting takes place by means of grooved or flat rollers (3-5) whose axes of rotation are at right angles to the broad sides the UniversaI ρ la11e and which lie in pairs one another opposite on each side of the universal plate (1) are arranged along the longitudinal sides (11).

The relevant edge section (12) is then through Hörizonta Iraο I I en (7-8) rolled, with the direction of rotation of the rollers parallel to the track (10) of the UniversaI ρ la11e (1) runs and at right angles to the long sides (11), possibly supported by verticals I ro 11 s (3) with a direction of rotation at right angles to these.

EXAMPLE:

The example explains a method according to the invention for producing a double IwuIstρrofi I rod according to FIG. 3, which is then cut in the middle into the desired WuI st ρrofi istange according to FIG.

A long Universa I pla11e (1) with a right-angled Cross section according to Fig. 4 is moved horizontally in a direction forward, which in Fig. 5 by a Arrow is marked. This is done on a Roller table, which is not shown in the drawings

is. Then the universal plate runs on two induction coils (2), which are arranged so that they protrude over the long sides (11) of the universal plate (1). The induction coils (2) concerned are with Alternating current is supplied so that eddy currents are generated on the long sides (11) of the UniversaI ρ Ia11e. the Width of the heated zone from the edge inwards and the corresponding temperature depends on the location and the Size of the induction coils concerned (2) as well as from supplied electricity. The temperature decreases from the edge section (12) in the direction of the web (10), measures the room temperature. A suitable temperature for upsetting and rolling the edge section in these examples is 900 C.

After heating the relevant edge section (12) the universal plate (1) is between three vertical Grooved RoI I en pairs (3-5) brought forward, through which the relevant long side (11) is compressed so that a previously determined width is achieved, and so that an exact Materia IvoLumen on each side of the levels is achieved through the two broad sides of the web. The material distribution between the The top and bottom of the edge sections (12) should be controlled in that a final product with close tolerances is achieved. The total volume of material is moreover for a subsequent formation of a Bead (9) along the edge portion (12) suitable. A pair of flat, horizontal guide rails (6) are on the top and bottom of the Universaρ la11e (1) at the third vertical pair of rollers (5) provided to

buckling of the web (10) of the Universa Lp la11e (1) impede.

The shaping of the bead (9) on the relevant edge section (12) the Universa I ρ La11e is expressed in two Wa I ζ between horizontal roll crushers and FiηishwaL ζ stands (7, 8) carried out in two Pairs are arranged along the relevant longitudinal side (11). Through the first of these roller pairs, the Roll crusher (7), a pre-forming of the bead (9) accomplished. Through the second pair of rollers, the Fiηishwa I zenständer (8), a final shaping takes place and Calibrate the bead (9). In the finnish roller stand (8) the roller below is a flat roller, while the roller above is grooved.

The double profile bar achieved according to FIG. 3 can in the web (10) along the lengthwise direction in two individual Wu I st ρrofi I rods according to FIG. 2 divided using a circular saw or the like.

Alternatively, the partial line can be next to the center line of the Doppe IprofiL pole, whereby WuLstprofiL pole 2 can be achieved with webs (10) of different widths.

Claims (2)

PATENT CLAIMS: 1. Method for producing a profile bar according to FIGS. 1 to 3 from metal, preferably from steel, with plane-parallel tracks (10) and with a or two edge portions (12) of others Cross-section design, thereby characterized in that of a universal plate (1) with the same thickness as the Track (10) of the finished bars it is assumed that the parts of the edges of the universal plate, whose shape is to be changed, is heated to the hot-roll temperature, and that the Shape of these edge sections (12) by hot rolling is brought to the desired profile shape. 2. The method according to claim 1, characterized in that the edges of the Universal plate can be heated inductively.