JPS583449B2 - Rolling mill positioning control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for controlling the positioning of a rolling mill when a pair of rolling rolls, such as upper and lower horizontal rolls, are driven separately and simultaneously to move a pass line and perform positioning.

For example, when rolling H-beam steel, the material is rolled from all directions, and then in the next pass, the material is rotated 90 degrees and rolled on another side to form the material, so the pass line is moved during rolling. .

In general shape steel rolling where the pass line and reduction opening vary widely, the movement of the upper and lower horizontal rolls is controlled separately, and there are differences in movement speed due to their mechanical conditions. During the setting of the next pass, the upper and lower horizontal roll surfaces may come into contact, resulting in roll eaves or having an adverse effect on the rolling mill itself.

In view of this point, the present invention provides a positioning system for a rolling mill that allows positioning to be performed without the upper and lower openings coming into contact when a pair of rolling rolls are driven separately and simultaneously to move the pass line and perform positioning. The purpose is to provide a control method.

For this reason, in the present invention, for example, an electronic computer is used to provide a speed standard to each of the upper and lower horizontal rolls, and position detectors are provided to each of the upper and lower horizontal rolls, and their positions are read into the computer at regular intervals. When the current opening degree of the upper and lower horizontal rolls during movement is narrower than the allowable opening degree for the target rolling opening degree, that is, (1) when the rolling opening degree is in the closing direction, the opening degree of both rolls becomes the target opening degree. (2) If the rolling opening is in the opening direction, the opening of both rolls is narrowed by more than the allowable constant value, that is, the allowable deviation α for the initial distance. When, for example, one side is the upper roll as the master and the other, that is, the lower roll is the slave, the vertical and horizontal rolls are followed and controlled,
A rolling mill having upper and lower horizontal rolls having different moving speeds is positioned to prevent contact between the upper and lower horizontal roll surfaces.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, UR and DR are the upper roll and lower roll of the rolling machine, D1 is a drive device for controlling the positioning and movement of the upper roll UR, D2 is a drive device for controlling the positioning and movement of the lower roll D), and S1 is a drive device for controlling the positioning and movement of the lower roll D). is the upper roll UR position detection device,
S2 indicates a position detection device for the lower roll DR.

COMP is an electronic computer, and position detector S1. The current positions of the upper rolls UR and DR are given from S2 to provide the required speed reference to the drive devices DI and D2.

Next, the positioning control method in this embodiment will be explained in detail.

Now, as shown in Fig. 2, the positioning for the closing direction reduction is performed, that is, from the initial state (initial opening degree d) in Fig. 2, the upper and lower rolls UR,
The DR is in the target state (target opening degree d) shown in Figure B.

;do<d) is taken as an example.

As mentioned above, in shape steel rolling, when changing the rolling opening, positioning is performed by moving the pass line, so as shown in the figure, the upper and lower rolls UR and DR change from the positional relationship in Figure 2A to the positional relationship in Figure 2B. Positioning is performed by moving to .

In FIG. 2, "0" indicates the initial mechanical position which serves as a mechanical reference point when inputting a position signal to the electronic computer COMP.

FIG. 3 shows an example of the position-time relationship of the upper and lower rolls UR and DR from the initial state shown in FIG. 2A until reaching the target position shown in FIG.

Generally, due to differences in mechanical friction and inertia between the upper roll UR and lower roll DR,
The movement characteristics of the upper and lower rolls U R and DR are usually different from each other (that is, they are not uniform), and these movement characteristics are usually not linear.

For convenience of explanation, the figure shows an example in which the upper roll UR moves linearly and the lower roll DR moves non-linearly.

In this figure, in sections I and ■, the opening degrees of the upper and lower rolls UR and DR at each instant are wider than (d0-α), and only in the section ■, the opening degrees of the upper and lower rolls UR and DR are (do
−α) is narrower.

Therefore, in this case, the present invention performs drive control as follows.

In section I, the upper and lower rolls UR and DR are each driven at regular intervals based on speed standards based on the deviation between the target position and the current position.

In section ■, when the rolling opening becomes (d0-α), the upper roll UR is driven by the speed standard according to the deviation between the target position and the current position, but the lower roll DR is driven with the target opening d0. It is driven by a speed standard according to the current deviation of the reduction opening (the shaded area in FIG. 3).

In this way, the lower roll DR moves with the target of the rolling opening of the upper and lower rolls, so the lower roll DR is moved closer to the upper roll UR.
, and both rolls are controlled to spread.

Then, when the opening degrees of the upper and lower rolls UR and DR become (aO-α) or more again in the section ■,
Similarly to the above case, the upper and lower rolls UR and DR are each driven based on the speed standard according to the deviation between the target position and the current position.

In Fig. 3, a and b indicate the positions of the upper roll UR and lower roll DR with respect to the mechanical reference point "O" at a certain moment, and a0 and b0 indicate the positions of the upper roll UR and the lower roll D.
The final position of R with respect to the mechanical reference point "O" is shown.

The above explanation is for the case where the rolling opening is in the closing direction, but if it is in the opening direction, the target opening may be replaced with the initial opening in the above explanation.

FIG. 4 shows a flowchart of the above operation.

In addition, when requesting upper and lower roll positioning, it is calculated whether (d0-α) or (d-α) is used as a comparison standard depending on whether the rolling opening is in the closing direction or in the opening direction this time.
It is assumed that the roles of the mask side and the slave side are determined at the same time.

As shown in Fig. 4, if there is a request for positioning, first the current positions of the upper and lower rolls UR and DR are detected, and the opening degree (a-b) of the upper and lower rolls at a certain moment is calculated as (do-α) [in the opening direction]. If (d-α)], then (a-b<do-α
), that is, if it corresponds to sections 1 and III in Fig. 3, a speed standard corresponding to (bo-b) is output to the lower roll DR side, and (a b < do - α). In other words, if it corresponds to section ■ in Figure 3, then C(a-b)
-do ] is output to the lower roll side.

This control is repeated at regular intervals. - As described above, in the present invention, at regular intervals, the smaller of the current downstream opening, the target rolling opening, and the initial opening of the pair of rolling rolls is set to a predetermined opening, taking into account the allowable deviation. When the downstream opening of both rolls is narrower than the predetermined opening, one roll is driven by the speed standard according to the deviation between the target position and the current position, and the other roll is driven by the speed standard according to the deviation between the target position and the current position. Rolling mill positioning control that effectively prevents contact between the upper and lower roll surfaces during movement to the target position, as the rolling mill is controlled to drive according to the speed standard according to the deviation between the downstream opening and the current downstream opening. method can be provided.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a diagram explaining the configuration of a rolling mill to which the present invention is applied, FIGS. 2A and B are diagrams showing the positional relationship between upper and lower rolls at the current position and the target position, respectively. FIG. 3 is a roll position one-time characteristic diagram of the upper and lower rolls for explaining an embodiment of the method of the present invention, and FIG. 4 is a flowchart of the method of the embodiment. UR...upper roll, DR...lower roll, D1...
Upper roll drive device, D2...lower roll drive device, S1
...Upper roll position detection device, S2...Lower roll position detection device, COMP...Electronic computer.

Claims (1)

[Claims] 1. When positioning a rolling mill in which the movement of a pair of rolling rolls is individually and simultaneously controlled to move a pass line and positioning is performed, the current rolling opening of the pair of rolling rolls is set as a target at regular intervals. Comparing the smaller of the rolling opening and the initial opening with a predetermined opening with allowances taken into account, when the rolling opening of both rolling rolls becomes narrower than this predetermined opening, the pair of rolling rolls One roll is driven with a speed standard according to the deviation between the target position and the current position, and the other roll is driven with a speed standard according to the deviation between the smaller opening and the current reduction opening to reach the target position. A rolling mill positioning control method that prevents contact between upper and lower rolls during movement.