KR20010062790A - Calibrating method for a universal roll stand - Google Patents

Abstract

PURPOSE: Provided is a calibration method for a universal roll stand with horizontal and vertical rolls in which the horizontal rolls can be positioned precisely relative to the vertical rolls independent of the shape of the rolls. CONSTITUTION: In a calibration method for a universal roll stand with horizontal rolls(1,2) and vertical rolls(3,4), wherein the horizontal rolls are supported in upper and lower horizontal chocks(5,6) and the vertical rolls are supported in vertical chocks(7,8) and wherein the horizontal rolls are configured to be screwed down on one another and the vertical rolls are configured to be screwed down on the horizontal rolls, the vertical chocks are moved between the horizontal chocks(6) such that vertical roll gaps remain between the horizontal rolls and the vertical rolls. Subsequently, spacers are arranged between the vertical chocks and at least one of the upper and the lower horizontal chocks. The horizontal chocks are advanced toward one another until the horizontal chocks contact the vertical chocks or the spacers, wherein the horizontal chocks during advancing are loaded maximally with an advancing force. The horizontal chocks are loaded after completion of advancing with a calibration force which is greater than the advancing force. After loading with the calibration force, the reached positional values of the horizontal chocks are measured and reference positions for subsequent rolling processes are determined based on the reached position values.

Description

Calibration method for universal roll stands {CALIBRATING METHOD FOR A UNIVERSAL ROLL STAND}

The present invention relates to a universal roll stand comprising horizontal rollers and vertical rollers and a method of correcting the same, more particularly at the same time the horizontal rollers are supported in the upper / lower horizontal chokes and the vertical rollers are respectively supported in the vertical chokes. And also to a universal roller stand correction method wherein the horizontal rollers are opposed to each other and the vertical rollers are respectively adjustable relative to the horizontal rollers.

Such correction methods are generally known. Examples include DE 35 01 622 C2, EP 0 483 939 B1 and EP 0 275 875 B1.

For DE 35 01 622 C2, the axial adjustment of the horizontal rollers is made. The document also discloses a method for vertically adjusting horizontal rollers. However, the method described above presupposes that the rollers are formed conical.

In EP 0 483 939 B1 the horizontal rollers are aligned parallel and horizontal to each other. A method for vertically adjusting horizontal rollers is not disclosed.

In the case of EP 0 275 875 B1 the rollers are operated with zero roll spacing using electromechanical coarse adjustment in the universal roll stand or with a roll spacing defined with choke. With hydraulic precision adjustment, the pressure in the adjustable cylinder rises, whereby the stand portions and the adjustment portions that lie in the horizontal and vertical force distribution are set to have a pressure below the compressive strain. The pressure will theoretically correspond to a moderate roll separation force expected according to the work schedule. However, the exact order of the adjustments and the alignment of the chokes are not mentioned in EP 0 275 875 B1.

SUMMARY OF THE INVENTION An object of the present invention is a universal roll stand comprising horizontal and vertical rollers, wherein at the same time providing a correction method for a universal roll stand in which the horizontal rollers can be accurately positioned relative to the vertical rollers regardless of the shape of the rollers. Is in.

1 shows a universal roll stand comprising horizontal and vertical rollers,

2 is a flow chart in accordance with the present invention.

(Explanation of drawing)

1-4: roller 5-8: choke

5'-8 ': Contact surface 9-12: Final control element

13-15: Step 16: Spacers

16 ': support surface 17-25: step

F, FV, FK, FW: power p, p1, p2 *: position

v1, v2: vertical roll clearance

Looking at the configuration according to the invention step by step as follows:

The vertical choke runs between the horizontal chokes in such a way that there is a vertical roll gap between the horizontal rollers and the vertical rollers,

On one side a spacer is arranged between the vertical chokes and the other top and / or horizontal chokes,

The horizontal chokes are approached until the horizontal chokes are adjacent to the vertical chokes or spacers, and at the same time as the approach of the horizontal choke the maximum of the transverse force is supplied to the horizontal chokes,

After approach, the horizontal chokes are supplied with a correction force greater than the transverse movement force,

After the correction force is supplied, the starting position value of the horizontal chokes is measured, from which the reference position for the subsequent rolling operation is determined.

If the access of the horizontal chokes is position controlled, the correction method particularly ensures operation. If the final positioning value is selected, the final positioning value is preset in the final control element for the horizontal choke and at the same time the horizontal chokes are firmly hitting the vertical chokes or spacers before reaching the final positioning value. The method is still viable.

If the progress step following the approach of the horizontal chokes is not executed upon reaching the final position setting value and an error message is output, the errors can be easily detected.

If the approach of the horizontal chokes is made in two advancing steps, and between the advancing steps in the adjusting device for the horizontal choke, the force generated in the unrolled state is measured, the force is corrected or offset to supply the adjusting device. As a value, it is used for the following rolling operation. In part, the horizontal chokes can be run in succession or at the same time hitting the vertical chokes or spacers.

If a corrective force is supplied to the horizontal choke with force controllable, a force balance can be achieved between the horizontal chokes.

If at least horizontal chokes, preferably vertical chokes are also hydraulically actuated, the universal roll stand is particularly convenient.

If the correction force is less than the roll separation force provided in the subsequent rolling operation, the spacers aligned between the vertical chokes and the horizontal chokes are not damaged.

If the horizontal chokes and the vertical chokes proceed in a position controlled manner after position measurement, the chokes can be stopped at an appropriate time before reaching the travel distance limit.

(Example)

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

According to FIG. 1 the universal roll stand comprises horizontal rollers 1, 2 and vertical rollers 3, 4. The horizontal rollers 1, 2 are installed in the horizontal chokes 5, 6, and the vertical rollers 3, 4 are installed in the vertical chokes 7, 8. The chokes 5-8 are adjustable by the final control elements 9-12. The final control elements 9-12 are formed simultaneously as hydraulic cylinder units. The chokes 5-8 are also hydraulically actuated.

The hydraulic cylinder units 9-12 operate with their position or force controlled. By means of the final control elements 9, 10 for the horizontal rollers 1, 2 the horizontal rollers are adjustable opposite to each other. The vertical rollers 3, 4 are adjustable relative to the horizontal rollers 1, 2 by their final control element 11, 12.

The universal roll stand shown in FIG. 1 serves to roll a profile, such as a dual T-beam, not shown in FIG. 1. The horizontal rollers 1, 2 then roll the horizontal bars of the profile, and the vertical rollers 3, 4 roll the flanges of the profile while interacting with the horizontal rollers 1, 2. The most important thing in the quality of the rolled profile is that the position of the bar is rolled correctly. It is therefore important that the horizontal rollers 1, 2 be adjusted vertically so that the center of the bar can be rolled. Said adjustment of the horizontal rollers 1, 2 in relation to the vertical rollers 3, 4 is named as a so-called pass line. Such adjustment or correction of the pass line is the object of the present invention.

The functional correlation between the actual position p and the lower edge position of the upper horizontal roller 1 to the upper edge position of the lower horizontal roller 2 is also determined relative to the pass line so that the hydraulic cylinder units 9, The actual position p of 10) is corrected. The position of the lower edge of the upper horizontal roller 1 relative to the pass line is determined by the diameter of the upper roller 1, the spacing of the central axis of the upper horizontal roller 1 with respect to the lower edge of the upper choke 5 and the upper horizontal choke with respect to the pass line. It depends on the interval of (5) and the like.

The diameter of the upper roller 1 can be easily measured or determined in other ways. The distance of the central axis of the upper horizontal roller 1 to the lower edge of the upper horizontal choke 5 is fixed. Therefore, it is sufficient to measure or otherwise detect the interval beforehand. Thus only a functional correlation between the spacing of the lower edge of the upper horizontal choke 5 with respect to the pass line and the actual position p of the hydraulic cylinder unit 9, etc. need to be determined. This is also the subject of the method described below. The position of the vertical roller center relative to the tip choke 7, 8 should be known for evaluating such determined correlation, and in some cases between the upper horizontal choke 5 and the vertical choke 7, 8. The thickness of the spacers 16 to be aligned should be known.

The functional correlation between the actual position p of the hydraulic cylinder unit 10 and the position of the lower horizontal roller 2 upper edge relative to the pass line is based on similar considerations of the lower horizontal choke 6 upper part of the pass line. It can be determined from the functional correlation between the gaps of the edges. In this case the center position of the vertical roller relative to the lower edge of the vertical chokes 7, 8 and in some cases the thickness of the spacer 16 aligned between the lower horizontal choke 6 and the vertical chokes 7, 8. It should be premised that such a thing is known.

If the above parameters are known, the horizontal rollers 1, 2 with respect to the vertical rollers 3, 4 can be corrected as described below with respect to FIG. 2.

Preferentially a force is applied to the horizontal chokes 5, 6 in step 13. Then in step 14 the vertical chokes 7, 8 between the horizontal chokes 5, 6 are activated. At this time, the vertical chokes 7, 8 proceed only so that there can be a vertical roll gap v1, v2 between the horizontal rollers 1, 2 and the vertical rollers 3, 4. The vertical roll spacing v1, v2 should be set to greater than zero (at least insignificantly).

In the next step 15 the spacer 16 is aligned between the vertical chokes 7, 8 on the one hand and the horizontal chokes 5, 6 on the other hand. The spacer 16 includes a flat support surface that is smoothly machined, and with such support surface the spacers 5 '-8' of the smooth side of the chokes 5-8 are likewise smoothly machined. With). The next horizontal chokes 5, 6 are approached-either simultaneously or successively. The approach of the horizontal chokes 5, 6 then consists of two progress steps.

In a first step the final control elements 9, 10 proceed to an intermediate position p1 in step 17. The force F distributed in the final control elements 9, 10 is then measured on the way to the intermediate position in order to determine the correction or offset value in step 18, the force being In order to provide the desired roll separation force FW in the subsequent rolling operation, it has to be supplied to the final control elements 9, 10 for the horizontal chokes 5, 6.

In the second stage the horizontal chokes 5, 6 are approached until they are adjacent to the vertical chokes 7, 8 to the spacer 16. In this regard, the final positioning values p2 * are preset in step 19 in the final control elements 9, 10. The final control elements 9, 10 then approach in a controlled position. The final control element then imposes a -corrected-force F on the horizontal chokes 5, 6. The force F is limited to the transverse movement force FV. The horizontal chokes 5, 6 are supplied with transverse movement force FV upon approach and at maximum. The horizontal chokes 5, 6 can simultaneously or successively in the second progression step subsequently impinge on the vertical chokes 7, 8 to the spacer.

The final position setting value p2 * is such that the horizontal chokes 5, 6 reliably strike the vertical chokes 7, 8 to the spacer 16 before reaching the set value p2 *. Is selected. Therefore, first of all, it is checked in step 20 whether the force F actually provided by the final control elements 9, 10 exceeds the transverse movement force FV. If it is not exceeded, in step 21, it is checked whether the final position setting value p2 * is achieved. If not, then step 21 is returned.

If the final position setting value p2 * is achieved, this is an indication that at least one of the calibration preconditions has not been met. Therefore, in this case, an error message is output in step 22, and the progress of the correction method is no longer performed.

After the horizontal chokes 5, 6 have been readjusted with respect to the vertical chokes 7, 8, the final control elements 9, 10 are switched to a force controlled mode, and in step 23 the correction force FK Will be supplied. The correction force FK is larger than the transverse movement force FV, but smaller than the roll separation force FW supplied in the subsequent rolling operation. The standard value for the lateral displacement force FV is 1% to 10% of the roll separation force FW, and the standard value for the correction force FK is 10% to 30% of the roll separation force FW.

After supplying the correction force FK to the horizontal chokes 5, 6, the actual value disclosed in step 24 to the position value p of the horizontal chokes 5, 6 are measured. The reference position for the subsequent rolling operation is then determined from the position value p, whereby the final control elements 9, 10 are corrected.

As a final step, in step 25 the chokes 5-8 are position controlled and energized, and the spacer 16 is moved away.

Using the method of the present invention the horizontal rollers 1, 2 can be precisely adjusted with respect to the roller center of the vertical rollers 3, 4 in an automated traveling sequence regardless of the shape of the rollers 1-4. have.

The vertical chokes 7, 8 usually have the same vertical position and are aligned at the same height. Also usually the spacers 16 have the same vertical position. Therefore, using the method according to the invention, the horizontal rollers 1, 2 are precisely adjusted in relation to the roller center points of the vertical rollers 3, 4 and the horizontal rollers 1, 2 are also horizontal. Preconditioned in state and parallel to each other.

According to the present invention, in the universal roll stand including horizontal and vertical rollers, at the same time, it is possible to provide a correction method for the universal roll stand in which the horizontal rollers can be accurately positioned in relation to the vertical rollers regardless of the shape of the rollers. have.

Claims (11)

In the universal roll stand comprising the horizontal rollers 1, 2 and the vertical rollers 3, 4, the horizontal rollers 1, 2 are simultaneously supported in the upper and lower horizontal chokes 5, 6. And the vertical rollers 3, 4 are supported in the vertical chokes 7, 8, also the horizontal rollers 1, 2 are opposed to each other and the vertical chokes 3, 4 are horizontal rollers. In the correction method for universal roll stand which is adjustable with respect to 1 and 2, The vertical chokes 7, 8 are horizontal chokes 5, 6 in such a way that there is a vertical roll spacing v1, v2 between the horizontal chokes 1, 2 and the vertical chokes 3, 4. Steps working between, The spacer 16 is aligned between the vertical chokes 7, 8 on the one hand and the upper and / or lower horizontal chokes 5, 6 on the other hand, The horizontal chokes 5, 6 are approached until the horizontal chokes 5, 6 are adjacent to the vertical chokes 7, 8 to the spacer 16, and at the same time the horizontal chokes 5, 6 Receiving a maximum value of the transverse movement force (FV) when approaching, The horizontal chokes 5, 6 are supplied with a correction force FK greater than the lateral movement force FV after approach, After the correction force FK has been supplied, the starting position value p of the horizontal chokes 5, 6 is measured, and using such a step, the next reference position for the rolling operation to be subsequently determined is determined from such a position value p. The correction method characterized by the above-mentioned. Method according to claim 1, characterized in that the approach of the horizontal chokes (5, 6) is made in such a way that the position is controlled. 3. The final positioning value (p2 *) is preset in the final control elements (9, 10) for the horizontal chokes (5, 6), while the horizontal chokes (5, 6) are in the final position. The final position setting value (p2 *) is selected in such a way that it will surely hit the vertical chokes (7, 8) to the spacer (16) before reaching the setting value (p2 *). 4. Method according to claim 3, characterized in that upon reaching the final position setting value (p2 *) no progression step following the approach of the horizontal chokes (5, 6) is executed and an error message is output. The method according to any one of the preceding claims, wherein the approach of the horizontal chokes (5, 6) is made in two stages, and the final for the horizontal chokes (5, 6) between the stages. The force distribution in the control elements (9, 10) is measured. 6. Method according to any one of the preceding claims, characterized in that the horizontal chokes (5, 6) subsequently hit the vertical chokes (7, 8) to the spacer (16) in succession. Method according to any of the preceding claims, characterized in that the horizontal chokes (5, 6) simultaneously strike the vertical chokes (7, 8) to the spacer (16). 8. Method according to any one of the preceding claims, characterized in that the supply of the correction force (FK) to the horizontal chokes (5, 6) is such that the force is controlled. 9. The method according to claim 1, wherein at least the horizontal chokes (5, 6), preferably also the vertical chokes (7, 8) are hydraulically actuated. 10. The correction method according to any one of claims 1 to 9, wherein the correction force (FK) is smaller than the roll separation force (FW) that will be generated in the subsequent rolling operation. The method according to claim 1, wherein the horizontal chokes 5, 6 and the vertical chokes 7, 8 are energized in a position controlled manner after the measurement of the position value p. A correction method characterized by the above-mentioned.