DE1294312B - Process and rolling frame for influencing the profile shape when producing profiles by hot rolling round or square steel - Google Patents

Description

1 2

The invention also relates to a method for influencing the regulation when the caliber is underfilled the profile shape flows across the width of the rolling stock when manufacturing profiles, by hot rolling of round or square steel. However, if the caliber is overfilled, a measurement is required in the case of large degrees of deformation in a single roll, the profile deviation is not possible, unless the stitch and a roll stand with an upstream 5 overfill is so strong that it becomes an undesirable rolling stock heating device leads to the exertion of the vertical burr formation. To now when rolling while driving. The invention relates in particular to closed caliber to avoid this formation of burrs Manufacture of finished profiles. the, is in a further embodiment of the invention

The main difficulty in rolling suggested that if the caliber is overfilled, the of profiles consists in the correct filling of the io caliber filling depending on the caliber to ensure the rollers, so that the decrease in the roller speed or occurring The profile is fully developed and the roll drive force is increased within narrow limits, is true to size without burrs. When rolling angled or asymmetrical

To be able to meet the requirement, it was customary up to now, see profiles, it depends on the location of the Profiles in several passes, mostly in three to seven 15 profiles to the rolling line so tightly during calibration Roll out stitches. By dividing the rolling lay that the working diameter at both If you work on several stitches, the decrease in rollers can be the same. If this is not the case, so the individual stitches kept low, changed and hindered the rollers with the smaller working one This means that the flow of material in the caliber can be distributed arbitrarily across the individual stitches. Kick it the. By means of a corresponding calibration, additional sliding movements can then be made between the waI-tion the rollers for the individual stitches have a bezene surface and the rolling stock which is to be damaged Flow behavior of the material can lead to forced degradation of the rolling stock surface, will. Since with such complicated profiles the determination

Apart from older trio roll stands, the working diameter is due to the high for which the caliber for the individual stitches over the 25 degrees of deformation is very difficult and also imprecise, Length of the rollers are incised in a distributed manner, is required for practicing the method according to the invention the rolling out of the profiles in several, usually the use of a duo roll stand in five stitches, a rolling mill also defeated, in which in a manner known per se only corresponding to many roll stands and one corresponding to one of the two caliber rolls directly approaching large roller park. 30 ben is. So can the peripheral speed

To simplify this complex rolling process, the second, not directly driven roll is removed it is known, the entire reshaping of the speaking the differently working through profile in a single stitch. However, adjust the knives yourself, causing damage are avoided in order to achieve a tolerance-conforming profile surface. The finished profile has such high demands on the potash caliber filling can be done on a medium material as well as the exact temperature control lere rolling temperature heated rolling stock depending on the put that this single-stitch rolling process in measured profile deviation both by heat Practice was unable to enforce. supply and take place through heat dissipation. this

The invention is therefore based on the object 40 takes place according to a further feature of the invention Manufacture of profiles according to the initially training expediently in that the mentioned type a method for influencing the roll stand upstream heating device as To create profile shape, which the above-mentioned electrical resistance heating device out-difficulties overcomes and in particular that forms is at which the distance between the contact-making from simple as well as complex and 45 places and the heating current can be changed. So can asymmetrical finished profiles with tight tolerances the heating of the rolling stock to the middle rolling and a smooth surface. This is invented temperature according to the rolling stock cross-section duly achieved by setting the required contact point temperature via the temperature of the incoming rolling stock, the caliber fill distance takes place, while regardless of this, the Development depending on the measured profile 50 Fine regulation of the rolled stock temperature by change in deviation in the sense of the desired profile of the heating current can be carried out, is regulated. The execution shown in the drawing

The invention is based on the known factual examples and details serve to explain the fact that the rolling temperature has an influence on the method according to the invention. It shows the flow conditions of the rolled material in the rolling ₅₅ F i g. 1 exerts an embodiment of a complete gap, which is considerable as a result of the large forming burrs of the rolling plant for the production of profiles. Namely, the warmer the rolling stock F i g. 2 shows an embodiment of a roll stand

is rolled, the longer it lengthens and the more with drive, the less it spreads. F i g. 3 shows an embodiment of a roller set

With large deformation burrs, rolling 60 in section,

Stitches with considerable design-related transformation. F i g. 4 a section through a with incomplete

mung or, taking into account the pull-through filling, working caliber and Winkeis maximum stitch reductions to be controlled F i g. 5 to 10 embodiments of on the

be understood. Infeed rolling mill producible profiles with each

When rolling in the open or not fully filled 65 because of the associated output cross-sections. The core of the rolling mill in the case of the one shown in FIG. 1

the width of the outgoing rolling stock can be regulated, the illustrated embodiment forms a rolling. When rolling in the closed caliber can frame 1, which has a heating device 2 a and 2 b

3 4

is upstream. The rails 17 running towards the rolling stand can be set by means of adjusting means 19 so that a rolling stock is set at 4 and the rolling stock running off at 5, so that the base 15 denotes very little force. The rolling stock heating device strives to roll on the rails 17,
present example as electrical resistance At the beginning of the rolling process, the heating device is formed, in which the heating 5 base 15 with the drum 13 and the directional current from a power-adjustable transformer 6 machine 14 in the limited by the brackets 18 over those in the stands 2 α and 2 b stored Kon- rearmost layer. The tip of the roller set is then fed to the rolling stock 4 and then again introduced into the straightening machine 14, which is guided. While the frame 2 b pulls on a bottom rolling stock 4 from the drum 13 and is fixed by plate 7, the frame 2 a io the contact rollers of the frames 2 α and 2 b is mounted on the roller on a slide Ta , which is mounted on the bottom - Feeding stand 1. The heating current is then shifted to the single plate 7 in the longitudinal direction of the rolling stock 4, which is between the contact rollers of the bar. For this purpose, a rolling stock 4 located in the base plate 7, stands 2 a and 2 b, is used to heat the stored average rolling stock temperature, which can be rotated by means of a handwheel 8 α. Now the despindel 8, which engages in a fixed on the carriage 7 α 15 upper roller in the roll stand 1 by means of the adjusting nut. The mobility of the stand 2 α direction 9 so far employed until the rolling stock 4 is provided by the distance of the rollers in the stands is detected. When the contact roller sets stored on roller 2 a and 2 b and thus temperature-heated rolling stock runs into the roll gap of the length of the resistance section in the rolling stock 4 roll stand 1, the top roll of the roll is adjusted according to its initial cross-section 20 stand 1 further adjusted until the caliber the WaI, while the fine control of the rolling stock according to the desired profile closed temperature to influence the pass filling is over and the actual rolling can begin, the primary circuit of the transformer 6 by changing the desired length of a profile Heating current takes place. This is done in the one single coil can be rolled, recommends that one behind the roll stand 1 is arranged with a view to reducing the size of the device 10 for continuous measurement of the main case and avoidance of rolling time losses, the dimension of the expiring Rolled stock is arranged tip of the rolled stock of a new bundle with which, depending on the measured end of the rolled stock of a preceding bundle, profile deviation, the temperature of the incoming welded, as is the case with wire processing of rolled stock and thus the gauge filling in the sense of 30 is generally customary.

desired profile. The main dimension is The outgoing rolling stock can, if the profile is to choose the dimension that also allows Auf-, to be reeled on a reel 36, conclusions about the degree of filling of the caliber, z. B. With many types of profile, however, the rolling stock becomes like the width of a flat profile. not shown in the exemplary embodiment, a cooling bed is expediently fed to the roll stand 1 in subdivided lengths. Also subordinate auxiliary frame 3, which can serve various purposes instead of the reel 13, a ken, not shown. It can thus be used, for example, as a billet bearing, which is used in particular to pull the rolling stock 5 that is running out in the case of larger initial cross-sections. In order to produce a clean, pronounced, burr-free profile, if necessary with particularly high degrees of deformation, the roll stand 1 must have an absolute pull-through capacity to be increased for most profiles. A closed caliber is required, in which the upper roller can be pressed firmly against the lower roller to legalize the rolled pro roller, which can then be used, as shown in FIG. 1 An exemplary embodiment of such a set of rolls is shown at 90 ° to the rolls of the roll stand 1 is shown in FIG. 3 shown. This is to be arranged for rolling with staggered rollers. Provided by the auxiliary _{45 of} a U-profile. The rollers consist of framework 3, the production of undercut longitudinal grooves 61 or 66 and on these profiles, for example profiles with dovetailed roller rings 62, 63 and 64 or 67, 68, is also possible. For this purpose, and 69, which are each held by a nut 65 and 70 of the roll stand 1, form a profile of a rollable groove and.

corresponding beads on the edges of the grooves

posed. The beads on the groove edges then become radially flat or almost radially flat rolling surfaces

rolled down in the auxiliary device 3, so that there are those on which the rolling stock under considerable

desired dovetail groove results. Transverse force slips, which means greater wear

In the case of small and various medium-sized pro-

It is possible to filen, as shown in FIG. 1 shown, from 55 measure to train this embodiment so

Covenant to work. The federal government is denoted by 12, the profile of the rolling caliber by replacing the

and is placed on a loosely rotatable drum 13. Roll rings 63 and 68 and re-turning of the roll rings

A straightening machine 14 is provided, which the rolling 62, 64 or 67, 69 are repeatedly reworked

well 4 pulls off the drum 13 and aligns it. It can. For profiles that do not have such rolled surfaces

The operating speed of the straightening machine 14 is required according to 60, for example in the case of angle irons

Adjusted the speed at which the rolling stock 4 F i g. 2, each roller can be made in one piece

is attracted by the rolls of the roll stand 1. because such rolls are easily reworked.

The rolling stock 4 is the roll stand 1 can thereby be tet with.

little train supplied that the drum 13 and thus the flow of material in the roll gap is free the straightening machine 14 can set on a 65 common to them, it is when rolling in two-roll pedestal 15 are mounted, the one with wheels 16 on caliber recommended, only one of the two rollers slightly inclined rails 17 to drive in the longitudinal direction of the rigid. You can either use the Rolled stock 4 is freely movable. The inclination of the drive for the second roller is entirely dispensed with

be, as is the case with the roller set shown in Fig. 3, or it can be the second Roller, as in FIG. 2, be provided with an auxiliary drive. This can for example be designed in this way be that it switches off automatically after the piercing or that it slows down in its speed hires himself and has a limited power output. In the embodiment shown in FIG is the top roller 72 via a pivot spindle 73 and a gear 74 of one of the The main motor 75, which determines the rolling speed, is driven by a fixed-speed motor. The lower roller 76, however is via a joint spindle 77 and a gear 78 from an auxiliary motor 79 of the above-described Kind of driven.

In the illustrated embodiment according to FIG. 1, the rolling stock is heated to rolling temperature exclusively by means of electrical resistance heating. This heating has the advantage of simple adjustment to the require _ao derliche average rolling temperature, combined with a slight controllability of the rolling temperature. However, this does not mean that the invention is restricted to this type of heating. Gas- or oil-fired continuous furnaces can also be used advantageously in the context of the invention, preference being given to these furnaces if the rolling stock to be heated has a relatively large cross-section. The combination of a furnace for preheating with a device for electrical resistance heating for reheating the rolling stock to a specific and controlled temperature can also be expedient.

The F i g. 4 shows, on a greatly enlarged scale, a caliber for producing profiles for umbrella poles. The caliber formed by the upper roller 85 and the lower roller 86 is during rolling only filled in the width shown in black. If the width of the rolling stock becomes larger in the caliber or less, the excess or undershooting of the drawn nominal width of the profile is also included the device 10 measured, and it is depending on the profile deviation, the temperature of the incoming rolling stock changed until the nominal width of the profile is reached again.

The profiles shown in FIGS. 5 to 10 are intended illustrate the versatility in which the rolling process according to the invention can be used can. Furthermore, the cross-sections of the output and the cross-sections arranged next to one another mediate The finished profile gives an idea of the deformation burrs that occur during single-stitch rolling.

Claims (4)

Patent claims: 1. Method for influencing the profile shape when producing profiles by hot rolling of round or square steel with high degrees of deformation in a single pass, in particular in the production of finished profiles, characterized in that the pass filling is via the temperature of the incoming rolling stock depending on the measured profile deviation in terms of the desired profile is regulated. 2. The method according to claim 1 for rolling in a closed pass, characterized in that that when the caliber is overfilled, the caliber filling is dependent on the thereby occurring reduction of the roller speed or increase of the roller drive force regulated will. 3. Roll stand for carrying out the method according to claim 1 or 2 when rolling in two-roll caliber, in particular for the production of angled or asymmetrical profiles, thereby characterized in that in a known manner only one of the two caliber rollers directly is driven. 4. Roll stand with upstream rolling stock heating device for carrying out the process according to claim 1 or 2, characterized in that the heating device is an electrical Resistance heating device is formed in which the distance between the contact points and the heating current can be changed. 1 sheet of drawings